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Электронный компонент: R1211N002C

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Step-up DC/DC Controller
R1211X Series
2001.8.30
Rev. 1.10 - 1 -
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OUTLINE

The R1211X Series are CMOS-based PWM step-up DC/DC converter controllers with low supply current.
Each of the R1211X Series consists of an oscillator, a PWM control circuit, a reference voltage unit, an error
amplifier, a reference current unit, a protection circuit, and an under voltage lockout (UVLO) circuit. A low ripple, high
efficiency step-up DC/DC converter can be composed of this IC with some external components, or an inductor, a
diode, a power MOSFET, divider resisters, and capacitors.
Phase compensation has been made internally in the R1211X002B/D Series, while phase compensation can be
made externally as for R1211X002A/C Series. B/D version has stand-by mode. Max duty cycle is internally fixed
typically at 90%. Soft start function is built-in, and Soft-starting time is set typically at 9ms(A/B, 700kHz version) or
10.5ms(C/D, 300kHz version). As for the protection circuit, after the soft-starting time, if the maximum duty cycle is
continued for a certain period, the R1211X Series latch the external driver with its off state, or Latch-type protection
circuit works. The delay time for latch the state can be set with an external capacitor.
To release the protection circuit, restart with power-on (Voltage supplier is equal or less than UVLO detector
threshold level), or once after making the circuit be stand-by with chip enable pin and enable the circuit again.
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FEATURES

q
Standby Current
TYP. 0A (for B/D version)
q Input Voltage Range
2.5V to 6.0V
q Built-in Latch-type Protection Function (Output Delay Time can be set with an external capacitor)
q Two Options of Basic Oscillator Frequency
300kHz, 700kHz
q Max Duty Cycle
Typ. 90%
q High Reference Voltage Accuracy
1.5%
q U.V.L.O. Threshold level
Typ. 2.2V (Hysteresis TYP. 0.13V)
q Small Package
SOT-23-6W or thin (package height MAX. 0.85mm) SON-6 (Under Development)
s
s
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APPLICATIONS
q
Constant Voltage Power Source for portable equipment.
q
Constant Voltage Power Source for LCD and CCD.
Rev. 1.10 - 2 -
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s
s
s
BLOCK DIAGRAMS
Version A
V
IN
EXT
OSC
Vref
Latch
DTC
DELAY
UVLO
GND
V
FB
AMPOUT
Version B
V
IN
EXT
OSC
Vref
Latch
DTC
DELAY
UVLO
GND
V
FB
Chip
Enable
CE
Rev. 1.10 - 3 -
s
s
s
s
SELECTION GUIDE
In the R1211X Series, the oscillator frequency, the optional function, and the package type for the ICs can be
selected at the user's request.
The selection can be made with designating the part number as shown below;
R1211X002X-TR
a
b
Code
Contents
a
Designation of Package Type:
D: SON-6
N: SOT23-6W
b
Designation of Optional Function
A : 700kHz, with AMPOUT pin (External Phase Compensation Type)
B : 700 kHz, with CE pin (Internal Phase Compensation Type, with Stand-by)
C : 300kHz, with AMPOUT pin (External Phase Compensation Type)
D : 300kHz, with CE pin (Internal Phase Compensation Type, with Stand-by)
s
s
s
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PIN CONFIGURATIONS
SON-6
SOT-23-6W
VFB
DELAY
AMPOUT/CE
GND
EXT
V
IN
VFB
DELAY
AMPOUT/CE
GND
EXT
V
IN
(MARK SIDE)
1
2
3
6
5
4
(MARK SIDE)
1
2
3
6
5
4
Rev. 1.10 - 4 -
s
PIN DESCRIPTIONS
Pin No.
Symbol
Description
SON6
SOT23-6W
1
1
DELAY Pin for External Capacitor (for Setting Output Delay of Protection)
2
5
GND
Ground Pin
3
6
EXT
External FET Drive Pin (CMOS Output)
4
4
V
IN
Power Supply Pin
5
3
V
FB
Feedback Pin for monitoring Output Voltage
6
2
AMPOUT
or CE
Amplifier Output Pin(A/C Version) or Chip Enable Pin(B/D
Version, Active at "H")
s
s
s
s
ABSOLUTE MAXIMUM RATINGS
Symbol
Item
Rating
Unit
V
IN
V
IN
Pin Voltage
6.5
V
V
EXT
EXT Pin Output Voltage
-0.3
V
IN
+0.3
V
V
DLY
DELAY Pin Voltage
-0.3
V
IN
+0.3
V
V
AMP
AMPOUT Pin Voltage
-0.3
V
IN
+0.3
V
V
CE
CE Pin Input Voltage
-0.3
V
IN
+0.3
V
V
FB
VFB Pin Voltage
-0.3
V
IN
+0.3
V
I
AMP
AMPOUT Pin Current
10
mA
I
EXT
EXT Pin Inductor Drive Output Current
50
mA
P
D
Power Dissipation
250
mW
Topt
Operating Temperature Range
-40
+85
C
Tstg
Storage Temperature Range
-55
+125
C
Rev. 1.10 - 5 -
s
ELECTRICAL CHARACTERISTICS
q
R1211X002A
(Topt=25
C)
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
IN
Operating Input Voltage
2.5
6.0
V
V
FB
V
FB
Voltage Tolerance
V
IN
=3.3V
0.985
1.000
1.015
V
V
FB
/
T
V
FB
Voltage
Temperature Coefficient
-40
C
Topt
85
C
150
ppm/
C
I
FB
V
FB
Input Current
V
IN
=6V, V
FB
=0V or 6V
-0.1
0.1
A
f
OSC
Oscillator Frequency
V
IN
=3.3V, V
DLY
=V
FB
=0V
595
700
805
kHz
f
OSC
/
T
Oscillator Frequency
Temperature Coefficient
-40
C
Topt
85
C
1.4
kHz/
C
I
DD1
Supply Current 1
V
IN
=6V, V
DLY
=V
FB
=0V, EXT at no load
600
900
A
maxdty
Maximum Duty Cycle
V
IN
=3.3V, EXT "H" side
82
90
94
%
R
EXTH
EXT "H" ON Resistance
V
IN
=3.3V, I
EXT
=-20mA
5
10
R
EXTL
EXT "L" ON Resistance
V
IN
=3.3V, I
EXT
=20mA
3
6
I
DLY1
Delay Pin Charge Current V
IN
=3.3V, V
DLY
=V
FB
=0V
2.5
5.0
7.5
A
I
DLY2
Delay Pin Discharge Current
V
IN
=V
FB
=2.5V, V
DLY
=0.1V
2.5
5.5
9.0
mA
V
DLY
Delay Pin Detector Threshold
V
IN
=3.3V, V
FB
=0V, V
DLY
=0V
2V
0.95
1.00
1.05
V
T
START
Soft-start Time
V
IN
=3.3V at 90% of rising edge
4.5
9.0
13.5
ms
V
UVLO1
UVLO Detector Threshold V
IN
=3.3V
0V, V
DLY
=V
FB
=0V
2.1
2.2
2.3
V
V
UVLO2
UVLO Detector Hysteresis V
IN
=0V
3.3V, V
DLY
=V
FB
=0V
0.08
0.13
0.18
V
I
AMP1
AMP "H" Output Current
V
IN
=3.3V, V
AMP
=1V, V
FB
=0.9V
0.45
0.90
1.50
mA
I
AMP2
AMP "L" Output Current
V
IN
=3.3V, V
AMP
=1V, V
FB
=1.1V
30
60
90
A
Rev. 1.10 - 6 -
q
R1211X002B
(Topt=25
C)
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
IN
Operating Input Voltage
2.5
6.0
V
V
FB
V
FB
Voltage Tolerance
V
IN
=3.3V
0.985
1.000
1.015
V
V
FB
/
T
V
FB
Voltage
Temperature Coefficient
-40
C
Topt
85
C
150
ppm/
C
I
FB
V
FB
Input Current
V
IN
=6V, V
FB
=0V or 6V
-0.1
0.1
A
f
OSC
Oscillator Frequency
V
IN
=3.3V, V
DLY
=V
FB
=0V
595
700
805
kHz
f
OSC
/
T
Oscillator Frequency
Temperature Coefficient
-40
C
Topt
85
C
1.4
kHz/
C
I
DD1
Supply Current 1
V
IN
=6V, V
DLY
=V
FB
=0V, EXT at no load
600
900
A
maxdty
Maximum Duty Cycle
V
IN
=3.3V, EXT "H" side
82
90
94
%
R
EXTH
EXT "H" ON Resistance
V
IN
=3.3V, I
EXT
=-20mA
5
10
R
EXTL
EXT "L" ON Resistance
V
IN
=3.3V, I
EXT
=20mA
3
6
I
DLY1
Delay Pin Charge Current V
IN
=3.3V, V
DLY
=V
FB
=0V
2.5
5.0
7.5
A
I
DLY2
Delay Pin Discharge Current
V
IN
=V
FB
=2.5V, V
DLY
=0.1V
2.5
5.5
9.0
mA
V
DLY
Delay Pin Detector Threshold
V
IN
=3.3V, V
FB
=0V, V
DLY
=0V
2V
0.95
1.00
1.05
V
T
START
Soft-start Time
V
IN
=3.3V
4.5
9.0
13.5
ms
V
UVLO1
UVLO Detector Threshold V
IN
=3.3V
0V, V
DLY
=V
FB
=0V
2.1
2.2
2.3
V
V
UVLO2
UVLO Detector Hysteresis V
IN
=0V
3.3V, V
DLY
=V
FB
=0V
0.08
0.13
0.18
V
I
STB
Standby Current
V
IN
=6V, V
CE
=0V
0
1
A
I
CEH
CE "H" Input Current
V
IN
=6V, V
CE
=6V
-0.5
0.5
A
I
CEL
CE "L" Input Current
V
IN
=6V, V
CE
=0V
-0.5
0.5
A
V
CEH
CE "H" Input Voltage
V
IN
=6V, V
CE
=0V
6V
1.5
V
V
CEL
CE "L" Input Voltage
V
IN
=2.5V, V
CE
=2V
0V
0.3
V
Rev. 1.10 - 7 -
q
R1211X002C
(Topt=25
C)
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
IN
Operating Input Voltage
2.5
6.0
V
V
FB
V
FB
Voltage Tolerance
V
IN
=3.3V
0.985
1.000
1.015
V
V
FB
/
T
V
FB
Voltage
Temperature Coefficient
-40
C
Topt
85
C
150
ppm/
C
I
FB
V
FB
Input Current
V
IN
=6V, V
FB
=0V or 6V
-0.1
0.1
A
f
OSC
Oscillator Frequency
V
IN
=3.3V, V
DLY
=V
FB
=0V
240
300
360
kHz
f
OSC
/
T
Oscillator Frequency
Temperature Coefficient
-40
C
Topt
85
C
0.6
kHz/
C
I
DD1
Supply Current 1
V
IN
=6V, V
DLY
=V
FB
=0V, EXT at no load
300
500
A
maxdty
Maximum Duty Cycle
V
IN
=3.3V, EXT "H" side
82
90
94
%
R
EXTH
EXT "H" ON Resistance
V
IN
=3.3V, I
EXT
=-20mA
5
10
R
EXTL
EXT "L" ON Resistance
V
IN
=3.3V, I
EXT
=20mA
3
6
I
DLY1
Delay Pin Charge Current V
IN
=3.3V, V
DLY
=V
FB
=0V
2.0
4.5
7.0
A
I
DLY2
Delay Pin Discharge Current
V
IN
=V
FB
=2.5V, V
DLY
=0.1V
2.5
5.5
9.0
mA
V
DLY
Delay Pin Detector Threshold
V
IN
=3.3V, V
FB
=0V, V
DLY
=0V
2V
0.95
1.00
1.05
V
T
START
Soft-start Time
V
IN
=3.3V
5.0
10.5
16.0
ms
V
UVLO1
UVLO Detector Threshold V
IN
=3.3V
0V, V
DLY
=V
FB
=0V
2.1
2.2
2.3
V
V
UVLO2
UVLO Detector Hysteresis V
IN
=0V
3.3V, V
DLY
=V
FB
=0V
0.08
0.13
0.18
V
I
AMP1
AMP "H" Output Current
V
IN
=3.3V, V
AMP
=1V, V
FB
=0.9V
0.45
0.90
1.50
mA
I
AMP2
AMP "L" Output Current
V
IN
=3.3V, V
AMP
=1V, V
FB
=1.1V
25
50
75
A
Rev. 1.10 - 8 -
q
R1211X002D
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
IN
Operating Input Voltage
2.5
6.0
V
V
FB
V
FB
Voltage Tolerance
V
IN
=3.3V
0.985
1.000
1.015
V
V
FB
/
T
V
FB
Voltage
Temperature Coefficient
-40
C
Topt
85
C
150
ppm/
C
I
FB
V
FB
Input Current
V
IN
=6V, V
FB
=0V or 6V
-0.1
0.1
A
f
OSC
Oscillator Frequency
V
IN
=3.3V, V
DLY
=V
FB
=0V
240
300
360
kHz
f
OSC
/
T
Oscillator Frequency
Temperature Coefficient
-40
C
Topt
85
C
0.6
kHz/
C
I
DD1
Supply Current 1
V
IN
=6V, V
DLY
=V
FB
=0V, EXT at no load
300
500
A
maxdty
Maximum Duty Cycle
V
IN
=3.3V, EXT "H" side
82
90
94
%
R
EXTH
EXT "H" ON Resistance
V
IN
=3.3V, I
EXT
=-20mA
5
10
R
EXTL
EXT "L" ON Resistance
V
IN
=3.3V, I
EXT
=20mA
3
6
I
DLY1
Delay Pin Charge Current V
IN
=3.3V, V
DLY
=V
FB
=0V
2.0
4.5
7.0
A
I
DLY2
Delay Pin Discharge Current
V
IN
=V
FB
=2.5V, V
DLY
=0.1V
2.5
5.5
9.0
mA
V
DLY
Delay Pin Detector Threshold
V
IN
=3.3V, V
FB
=0V, V
DLY
=0V
2V
0.95
1.00
1.05
V
T
START
Soft-start Time
V
IN
=3.3V
5.0
10.5
16.0
ms
V
UVLO1
UVLO Detector Threshold V
IN
=3.3V
0V, V
DLY
=V
FB
=0V
2.1
2.2
2.3
V
V
UVLO2
UVLO Detector Hysteresis V
IN
=0V
3.3V, V
DLY
=V
FB
=0V
0.08
0.13
0.18
V
I
STB
Standby Current
V
IN
=6V, V
CE
=0V
0
1
A
I
CEH
CE "H" Input Current
V
IN
=6V, V
CE
=6V
-0.5
0.5
A
I
CEL
CE "L" Input Current
V
IN
=6V, V
CE
=0V
-0.5
0.5
A
V
CEH
CE "H" Input Voltage
V
IN
=6V, V
CE
=0V
6V
1.5
V
V
CEL
CE "L" Input Voltage
V
IN
=2.5V, V
CE
=2V
0V
0.3
V
Rev. 1.10 - 9 -
s
s
s
s
TYPICAL APPLICATIONS AND TECHNICAL NOTES
<R1211X002A/R1211X002C>
C3
Inductor
Diode
NMOS
V
IN
EXT
DELAY VFB
GND AMPOUT
C1
C2
C4
R1
R2
R3
C5 R4
NMOS: IRF7601 (International Rectifier)
Inductor : LDR655312T-100 10
H (TDK) for R1211X002A
: LDR655312T-220 22
H (TDK) for R1211X002C
Diode: CRS02 (Toshiba)
C1: 4.7
F (Ceramic)
R1: Output Voltage Setting Resistor 1
C2: 0.22
F (Ceramic)
R2: Output Voltage Setting Resistor 2
C3: 10
F (Ceramic)
R3: 30k
C4: 680pF(Ceramic)
R4: 30k
C5: 2200pF(Ceramic)
<R1211X002B/R1211X002D>
Inductor
Diode
NMOS
VIN EXT
DELAY VFB
GND CE
C1
C2
C3
C4
R1
R2
R3
CE Control
NMOS: IRF7601 (International Rectifier)
Inductor: LDR655312T-100 10
H (TDK) for R1211X002B
LDR655312T-220 22
H (TDK) for R1211X002D
Diode: CRS02 (Toshiba)
C1: 4.7
F (Ceramic)
R1: Setting Output Voltage Resistor1
C2: 0.22
F (Ceramic)
R2: Setting Output Voltage Resistor2
C3: 10
F (Ceramic)
R3 : 30k
C4: 680pF(Ceramic)
[Note] These example circuits may be applied to the output voltage requirement is 15V or less. If the output voltage
requirement is 15V or more, ratings of NMOS and diode as shown above is over the limit, therefore, choose other
external components.
Rev. 1.10 - 10 -
q
Use a 1
F or more capacitance value of bypass capacitor between V
IN
pin and GND, C1 as shown in the typical
applications above.
q
In terms of the capacitor for setting delay time of the latch protection, C2 as shown in typical applications of the
previous page, connect between Delay pin and GND pin of the IC with the minimum wiring distance.
q
Connect a 1
F or more value of capacitor between V
OUT
and GND, C3 as shown in typical applications of the
previous page. (Recommended value is from 10
F to 22
F.) If the operation of the composed DC/DC converter may
be unstable, use a tantalum type capacitor instead of ceramic type.
q
Connect a capacitor between V
OUT
and the dividing point, C4 as shown in typical applications of the previous page.
The capacitance value of C4 depends on divider resistors for output voltage setting. Typical value is between 100pF
and 1000pF.
q
Output Voltage can be set with divider resistors for voltage setting, R1 and R2 as shown in typical applications of
the previous page. Refer to the next formula.
Output Voltage = V
FB
(R1+R2)/R2
R1+R2=100k
is recommended range of resistances.
q
The operation of Latch protection circuit is as follows: When the IC detects maximum duty cycle, charge to an
external capacitor, C2 of DELAY pin starts. And maximum duty cycle continues and the voltage of DELAY pin
reaches delay voltage detector threshold, V
DLY
, outputs "L" to EXT pin and turns off the external power MOSFET.
To release the latch protection operation, make the IC be standby mode with CE pin and make it active in terms of
B/D version. Otherwise, restart with power on.
The delay time of latch protection can be calculated with C2, V
DLY
, and Delay Pin Charge Current, I
DLY1
, as in the
next formula.
t=C2
V
DLY
/I
DLY1
Once after the maximum duty is detected and released before delay time, charge to the capacitor is halt and delay
pin outputs "L".
q
As for R1211X002A/C version, the values and positioning of C4, C5, R3, and R4 shown in the above diagram are
just an example combination. These are for making phase compensation. If the spike noise of V
OUT
may be large,
the spike noise may be picked into V
FB
pin and make the operation unstable. In this case, a resistor R3, shown in
typical applications of the previous page. The recommended resistance value of R3 is in the range from 10k
to
50k
. Then, noise level will be decreased.
q
As for R1211X002B/D version, EXT pin outputs GND level at standby mode.
q
Select the Power MOSFET, the diode, and the inductor within ratings (Voltage, Current, Power) of this IC. Choose
the power MOSFET with low threshold voltage depending on Input Voltage to be able to turn on the FET completely.
Choose the diode with low V
F
such as Shottky type, and with low reverse current I
R,
and with fast switching speed.
When an external transistor is switching, spike voltage may be generated caused by an inductor, therefore
recommended voltage tolerance of capacitor connected to V
OUT
is three times of setting voltage or more.
The performance of power circuit with using this IC depends on external components. Choose the most suitable
components for your application.
Rev. 1.10 - 11 -
s
Output Current and Selection of External Components
<Basic Circuit>
Inductor
Diode
C
L
Lx Tr
V
IN
V
OUT
I
OUT
ILxmax
ILxmin
Ton
Toff
T=1/fosc
Tf
IL
Discontinuous Mode
t
ILxmax
ILxmin
Ton
Toff
T=1/fosc
t
IL
Iconst
Continuous Mode
<Current through L>
GND
i1
i2

There are two modes, or discontinuous mode and continuous mode for the PWM step-up switching regulator
depending on the continuous characteristic of inductor current.
During on time of the transistor, when the voltage added on to the inductor is described as V
IN
, the current is V
IN
t/L.
Therefore, the electric power, P
ON
, which is supplied with input side, can be described as in next formula.
T
ON
P
ON
=
V
IN
2
t/L dt
Formula 1
0
With the step-up circuit, electric power is supplied from power source also during off time. In this case, input current is
described as (V
OUT
-V
IN
)
t/L, therefore electric power, P
OFF
is described as in next formula.
Tf
P
OFF
=
V
IN
(V
OUT
-V
IN
)
t/L dt
Formula 2
0
In this formula, Tf means the time of which the energy saved in the inductance is being emitted. Thus average
electric power, P
AV
is described as in the next formula.
T
ON
Tf
P
AV
=1/(Ton+Toff)
{
V
IN
2
t/L dt +
V
IN
(V
OUT
-V
IN
)
t/L dt} Formula 3
0 0
In PWM control, when Tf=Toff is true, the inductor current becomes continuos, then the operation of switching
regulator becomes continuous mode.
In the continuous mode, the deviation of the current is equal between on time and off time.
V
IN
Ton/L=(V
OUT
-V
IN
)
Toff/L
Formula 4
Further, the electric power, P
AV
is equal to output electric power, V
OUT
I
OUT
, thus,
I
OUT
= f
OSC
V
IN
2
T
ON
2
/{2
L
(V
OUT
-V
IN
)}=V
IN
2
T
ON
/(2
L
V
OUT
)
Formula 5
When I
OUT
becomes more than formula 5, the current flows through the inductor, then the mode becomes
Rev. 1.10 - 12 -
continuous. The continuous current through the inductor is described as Iconst, then,
I
OUT
= f
OSC
V
IN
2
t
ON
2
/(2
L
(V
OUT
-V
IN
))+V
IN
Iconst/V
OUT
Formula 6
In this moment, the peak current, ILxmax flowing through the inductor and the driver Tr. is described as follows:
ILxmax = Iconst +V
IN
Ton/L
Formula 7
With the formula 4,6, and ILxmax is,
ILxmax = V
OUT
/V
IN
I
OUT
+V
IN
Ton/(2
L)
Formula 8
Therefore, peak current is more than I
OUT
. Considering the value of ILxmax, the condition of input and output, and
external components should be selected.
In the formula 7, peak current ILxmax at discontinuous mode can be calculated. Put Iconst=0 in the formula.
The explanation above is based on the ideal calculation, and the loss caused by Lx switch and external components
is not included. The actual maximum output current is between 50% and 80% of the calculation. Especially, when the
ILx is large, or V
IN
is low, the loss of V
IN
is generated with the on resistance of the switch. As for V
OUT,
Vf (as much as
0.3V) of the diode should be considered.
s
TIMING CHART
q
R1211X002A/R1211X002C
EXT
V
OUT
SS
VREF
PWM Comparator
OP AMP
V
FB
AMPOUT
DTC
R1
R2
EXT
q
R1211X002B/R1211X002D
EXT
V
OUT
SS
VREF
PWM Comparator
OP AMP
V
FB
AMPOUT
DTC
R1
R2
EXT
<Soft-start Operation>
Soft-start operation is starting from power-on as follows:
(Step1)
The voltage level of SS is rising gradually by constant current circuit of the IC and a capacitor. V
REF
level which is
input to OP AMP is also gradually rising. V
OUT
is rising up to input voltage level just after the power-on, therefore, V
FB
voltage is rising up to the setting voltage with input voltage and the ration of R1 and R2. AMPOUT is at "L", and
switching does not start.
(Step2)
Rev. 1.10 - 13 -
When the voltage level of SS becomes the setting voltage with the ration of R1 and R2 or more, switching operation
starts. V
REF
level gradually increases together with SS level. V
OUT
is also rising with balancing V
REF
and V
FB
. Duty
cycle depends on the lowest level among AMPOUT, SS, and DTC of the 4 input terminals in the PWM comparator.
(Step3)
When SS reaches 1V, soft-start operation finishes. V
REF
becomes constant voltage (=1V). Then the switching
operation becomes normal mode.
V
IN
V
OUT
SS,VREF
V
FB
SS
V
FB
,VREF
AMPOUT
Step1 Step2
DTC
AMPOUT
<Latch Protection Operation>
The operation of Latch protection circuit is as follows: When AMPOUT becomes "H" and the IC detects maximum
duty cycle, charge to an external capacitor, C2 of DELAY pin starts. And maximum duty cycle continues and the
voltage of DELAY pin reaches delay voltage detector threshold, V
DLY
, outputs "L" to EXT pin and turns off the
external power MOSFET.
To release the latch protection operation, make the IC be standby mode with CE pin and make it active in terms of
R1211X002B/D version. Otherwise, make supply voltage down to UVLO detector threshold or lower, and make it rise
up to the normal input voltage.
During the soft-start time, if the duty cycle may be the maximum, protection circuit does not work and DELAY pin is
fixed at GND level.
The delay time of latch protection can be calculated with C2, V
DLY
, and Delay Pin Charge Current, I
DLY1
, as in the
next formula.
t=C2
V
DLY
/I
DLY1
Once after the maximum duty is detected and released before delay time, charge to the capacitor is halt and delay
pin outputs "L".
V
DLY
AMPOUT
Normal
maxduty
Operation
Latched
DTC
AMPOUT
DELAY
Output Short
EXT
Rev. 1.10 - 14 -
s
s
s
s
TEST CIRCUITS
q
R1211X002A/R1211X002C
*Oscillator Frequency, Maximum Duty Cycle, V
FB
Voltage Test
*Consumption Current Test
3.3V
V
IN
EXT
V
FB
GND DELAY
OS
OS
OS
OSC
C
C
CILLOSC
ILLOSC
ILLOSC
ILLOSCO
O
O
OPE
PE
PE
PE
6V
A
V
IN
V
FB
GND DELAY
*EXT "H" ON Resistance
*EXT "L" ON Resistance
3.3V
V
IN
EXT
V
FB
GND
150
OS
OS
OS
OSC
C
C
CILLOSC
ILLOSC
ILLOSC
ILLOSCO
O
O
OPE
PE
PE
PE
DELAY
3.3V
150
V
V
IN
EXT
V
FB
DELAY
GND
*DELAY Pin Charge Current
*DELAY PIn Discharge Current
V
IN
V
FB
DELAY
GND
3.3V
A
2.5V
0.1V
V
IN
V
FB
DELAY
GND
A
Rev. 1.10 - 15 -
*DELAY Pin Detector Threshold Voltage Test
*AMP "H" Output Current/"L" Output Current Test
3.3V
V
IN
EXT
V
FB
DELAY
GND
OS
OS
OS
OSC
C
C
CILLOSC
ILLOSC
ILLOSC
ILLOSC O
O
O
OPE
PE
PE
PE
3.3V
V
IN
AMPOUT
V
FB
DELAY
GND
A
1V
*UVLO Detector Threshold/Hysteresis Range Test
V
IN
EXT
V
FB
DELAY
GND
OS
OS
OS
OSC
C
C
CILLOSC
ILLOSC
ILLOSC
ILLOSC O
O
O
OPE
PE
PE
PE
*Soft-start Time Test
Rout
VIN
EXT
AMPOUT
V FB
GND
DELAY
Coil
Diode
C1
R1
R2
C2
NMOS
C3
R3
R4
C4
C 5
V
OUT
OS
OS
OS
OSC
C
C
CILLOSC
ILLOSC
ILLOSC
ILLOSCOPE
OPE
OPE
OPE
<Components>
Inductor (L)
: 22
H (TDK LDR655312T-220)
Diode (SD)
: CRS02 (Toshiba)
Capacitors
C1: 680pF(Ceramic), C2: 22
F (Tantalum)+2.2
F (Ceramic),
C3: 68
F (Tantalum)+2.2
F (Ceramic), C4: 2200pF(Ceramic), C5: 22
F(Tantalum)
NMOS Transistor : IRF7601 (International Rectifier)
Resistors
: R1: 90k
, R2:10k
, R3:30k
, R4:30k
, Rout:1k
/330
Rev. 1.10 - 16 -
q
R1211X002B/R1211X002D
*Oscillator Frequency, Maximum Duty Cycle, V
FB
Voltage Test
*Consumption Current Test
3.3V
OS
OS
OS
OSC
C
C
CILLOSC
ILLOSC
ILLOSC
ILLOSCOPE
OPE
OPE
OPE
V
IN
EXT
CE
V
FB
GND
DELAY
6V
A
V
IN
CE
V
FB
GND
DELAY
*EXT "H" ON Resistance
*EXT "L" ON Resistance
3.3V
V
IN
EXT
CE
V
FB
GND
DELAY
150
OS
OS
OS
OSC
C
C
CILLOSC
ILLOSC
ILLOSC
ILLOSCOPE
OPE
OPE
OPE
3.3V
150
V
V
IN
EXT
CE
V
FB
GND
DELAY
*DELAY Pin Charge Current
*DELAY PIn Discharge Current
3.3V
V
IN
CE
V
FB
GND
DELAY
A
2.5V
0.1V
V
IN
CE
V
FB
GND
DELAY
A
Rev. 1.10 - 17 -
*DELAY Pin Detector Threshold Voltage Test
*Standby Current Test
3.3V
V
IN
EXT
CE
V
FB
GND DELAY
OS
OS
OS
OSC
C
C
CILLOSC
ILLOSC
ILLOSC
ILLOSCOPE
OPE
OPE
OPE
6V
A
V
IN
CE
V
FB
GND
DELAY
*UVLO Detector Threshold/Hysteresis Range Test
* CE "L" Input Current/"H" Input Current Test
V
IN
EXT
CE
V
FB
GND
DELAY
OS
OS
OS
OSC
C
C
CILLOSC
ILLOSC
ILLOSC
ILLOSCOPE
OPE
OPE
OPE
A
V
IN
CE
V
FB
GND
DELAY
0V/6V
*CE "L" Input Voltage/"H" Input Voltage Test
V
IN
EXT
CE
V
FB
GND
DELAY
OS
OS
OS
OSC
C
C
CILLOSC
ILLOSC
ILLOSC
ILLOSCO
O
O
OPE
PE
PE
PE
*Soft-start Time Test
Rout
V
IN
EXT
CE
V
FB
GND DELAY
Coil
C1
R1
R2
C2
NMOS
C3
R3
C5
0V/3.3V
OS
OS
OS
OSC
C
C
CILLOSC
ILLOSC
ILLOSC
ILLOSCO
O
O
OPE
PE
PE
PE
V
OUT
Rev. 1.10 - 18 -
<Components>
Inductor (L)
: 22
H (TDK LDR655312T-220)
Diode (SD)
: CRS02 (Toshiba)
Capacitors
C1: 680pF(Ceramic), C2: 22
F (Tantalum)+2.2
F (Ceramic),
C3: 68
F (Tantalum)+2.2
F (Ceramic), C5: 22
F (Tantalum)
NMOS Transistor : IRF7601 (International Rectifier)
Resistors
: R1: 90k
, R2: 10k
, R3: 30k
s
s
s
s
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current
4.9
5
5.1
1
10
100
1000
Output Current I
OUT
[mA]
Output Voltage V
OUT
[V]
V
IN
=2.5V
V
IN
=3.3V
R1211X002A
L=10uH
V
OUT
=5V
9.8
10
10.2
1
10
100
1000
Output Current I
OUT
[mA]
Output Voltage V
OUT
[V]
R1211X002A
L=10uH
VOUT=10V
V
IN
=2.5V
V
IN
=3.3V
V
IN
=5.0V
14.7
15
15.3
1
10
100
1000
Output Current I
OUT
[mA]
Output Voltage V
OUT
[V]
R1211X002A
L=10uH
V
OUT
=15V
V
IN
=2.5V
V
IN
=3.3V
V
IN
=5.0V
4.9
5
5.1
1
10
100
1000
Output Current I
OUT
[mA]
Output Voltage V
OUT
[V]
R1211X002B
L=10uH
V
OUT
=5V
V
IN
=2.5V
V
IN
=3.3V
9.8
10
10.2
1
10
100
1000
Output Current I
OUT [
mA]
Output Voltage V
OUT
[V]
R1211X002B
L=10uH
V
OUT
=10V
V
IN
=2.5V
V
IN
=3.3V
V
IN
=5.0V
14.7
15
15.3
1
10
100
1000
Output Current I
OUT
[mA]
Output Voltage V
OUT
[V]
R1211X002B
L=10uH
V
OUT
=15V
V
IN
=2.5V
V
IN
=3.3V
V
IN
=5.0V
Rev. 1.10 - 19 -
4.9
5
5.1
1
10
100
1000
Output Current I
OUT
[mA]
Output Voltage V
OUT
[V]
VIN=2.5V
VIN=3.3V
R1211X002C
L=22uH
V
OUT
=5V
9.8
10
10.2
1
10
100
1000
Output Current I
OUT
[mA]
Output Voltage V
OUT
[V]
VIN=2.5V
VIN=3.3V
VIN=5.0V
R1211X002C
L=22uH
V
OUT
=10V
14.7
15
15.3
1
10
100
1000
Output Current I
OUT
[mA]
Output Voltage V
OUT
[V]
VIN=2.5V
VIN=3.3V
VIN=5.0V
R1211X002C
L=22uH
V
OUT
=15V
4.9
5
5.1
1
10
100
1000
Output Current I
OUT
[mA]
Output Voltage V
OUT
[V]
R1211X002D
L=22uH
V
OUT
=5V
V
IN
=2.5V
V
IN
=3.3V
9.8
10
10.2
1
10
100
1000
Output Current I
OUT
[mA]
Output Voltage V
OUT
[V]
R1211X002D
L=22uH
V
OUT
=10V
V
IN
=2.5V
V
IN
=3.3V
V
IN
=5.0V
14.7
15
15.3
1
10
100
1000
Output Current I
OUT
[mA]
Output Voltage V
OUT
[V]
V
IN
=2.5V
V
IN
=3.3V
V
IN
=5.0V
R1211X002D
L=22uH
V
OUT
=15V
Rev. 1.10 - 20 -
2) Efficiency vs. Output Current
0
20
40
60
80
100
1
10
100
1000
Output Current I
OUT
[mA]
Efficiency


[%
]
R1211X002A
L=10uH
V
OUT
=5V
V
IN
=2.5V
V
IN
=3.3V
0
20
40
60
80
100
1
10
100
1000
Output Current I
OUT
[mA]
Efficiency


[%
]
V
IN
=2.5V
V
IN
=3.3V
V
IN
=5.0V
R1211X002A
L=10uH
V
OUT
=10V
0
20
40
60
80
100
1
10
100
1000
Output Current I
OUT
[mA]
Efficiency


[%
]
R1211X002A
L=10uH
V
OUT
=15V
V
IN
=2.5V
V
IN
=3.3V
V
IN
=5.0V
0
20
40
60
80
100
1
10
100
1000
Output Current I
OUT
[mA]
Efficiency


[%
]
R1211X002B
L=10uH
V
OUT
=5V
V
IN
=2.5V
V
IN
=3.3V
0
20
40
60
80
100
1
10
100
1000
Output Current I
OUT
[mA]
Efficiency


[%
]
R1211X002B
L=10uH
V
OUT
=10V
V
IN
=2.5V
V
IN
=3.3V
V
IN
=5.0V
0
20
40
60
80
100
1
10
100
1000
Output Current I
OUT
[mA]
Efficiency


[%
]
R1211X002B
L=10uH
V
OUT
=15V
V
IN
=2.5V
V
IN
=3.3V
V
IN
=5.0V
Rev. 1.10 - 21 -
0
20
40
60
80
100
1
10
100
1000
Output Current I
OUT
[mA]
Efficiency


[%
]
VIN=2.5V
VIN=3.3V
R1211X002C
L=22uH
V
OUT
=5V
0
20
40
60
80
100
1
10
100
1000
Output Current I
OUT
[mA]
Efficiency


[%
]
VIN=2.5V
VIN=3.3V
VIN=5.0V
R1211X002C
L=22uH
V
OUT
=10V
0
20
40
60
80
100
1
10
100
1000
Output Current I
OUT
[mA]
Efficiency


[%
]
VIN=2.5V
VIN=3.3V
VIN=5.0V
R1211X002C
L=22uH
V
OUT
=15V
0
20
40
60
80
100
1
10
100
1000
Output Current I
OUT
[mA]
Efficiency


[%
]
R1211X002D
L=22uH
V
OUT
=5V
V
IN
=2.5V
V
IN
=3.3V
0
20
40
60
80
100
1
10
100
1000
Output Current I
OUT
[mA]
Efficiency


[%
]
R1211X002D
L=22uH
V
OUT
=10V
V
IN
=2.5V
V
IN
=3.3V
V
IN
=5.0V
0
20
40
60
80
100
1
10
100
1000
Output Current I
OUT
[mA]
Efficiency


[%
]
V
IN
=2.5V
V
IN
=3.3V
V
IN
=5.0V
R1211X002D
L=22uH
V
OUT
=15V
Rev. 1.10 - 22 -
3) V
FB
Voltage vs. Input Voltage (Topt =25
C)
985
990
995
1000
1005
1010
1015
2
3
4
5
6
Input Voltage V
IN
[V]
VFB Voltage

[
m
V
]
R1211X002X
4) Oscillator Frequency vs. Input Voltage (Topt=25
C)
500
600
700
800
900
2
3
4
5
6
Input Voltage V
IN
[V]
Oscillator Frequency
[kHz]
R1211X002A/B
200
250
300
350
400
2
3
4
5
6
Input Voltage V
IN
[V]
Oscillator Frequency
[kHz]
R1211X002C/D
5) Supply Current vs. Input Voltage (Topt=25
C)
0
100
200
300
400
500
600
2
3
4
5
6
Input Voltage V
IN
[V]
Supply Current

[
u
A
]
R1211X002A
0
100
200
300
400
500
600
2
3
4
5
6
Input Voltage V
IN
[V]
Supply Current

[
u
A
]
R1211X002B
Rev. 1.10 - 23 -
0
100
200
300
400
2
3
4
5
6
Input Voltage V
IN
[V]
Supply Current

[
u
A
]
R1211X002C
0
100
200
300
400
2
3
4
5
6
Input Voltage V
IN
[V]
Supply Current

[
u
A
]
R1211X002D
6) Maximum Duty Cycle vs. Input Voltage (Topt=25
C)
80
82
84
86
88
90
92
94
96
2
3
4
5
6
Input Voltage V
IN
[V]
Maximum Duty Cycle

[
%
]
R1211X002A/B
80
82
84
86
88
90
92
94
96
2
3
4
5
6
Input Voltage V
IN
[V]
Maximum Duty Cycle

[
%
]
R1211X002C/D
7) V
FB
Voltage vs. Temperature
985
990
995
1000
1005
1010
1015
-50
-25
0
25
50
75
100
Temperature Topt
VFB Voltage

[
m
V
]
R1211X002X V
IN
=3.3V
(
C)
Rev. 1.10 - 24 -
8) Oscillator Frequency vs. Temperature
500
600
700
800
900
-50
-25
0
25
50
75
100
Temperature Topt
Oscillator Frequency
[
kHz]
R1211X002A/B V
IN
=3.3V
200
250
300
350
400
-50
-25
0
25
50
75
100
Temperature Topt
Oscillator Frequency
[kHz]
R1211X002C/D V
IN
=3.3V
9) Supply Current vs. Temperature
0
100
200
300
400
500
600
-50
-25
0
25
50
75
100
Temperature Topt
Supply Current
[uA]
R1211X002A V
IN
=3.3V
0
100
200
300
400
500
600
-50
-25
0
25
50
75
100
Temperature Topt
Supply Current

[
u
A
]
R1211X002B V
IN
=3.3V
0
100
200
300
400
-50
-25
0
25
50
75
100
Temperature Topt
Supply Current

[
u
A
]
R1211X002C V
IN
=3.3V
0
100
200
300
400
-50
-25
0
25
50
75
100
Temperature Topt
Supply Current

[
u
A
]
R1211X002D V
IN
=3.3V
(
C)
(
C)
(
C)
(
C)
(
C)
(
C)
(
C)
Rev. 1.10 - 25 -
10) Maximum Duty Cycle vs. Temperature
80
82
84
86
88
90
92
94
96
-50
-25
0
25
50
75
100
Temperature Topt
Maximum Duty Cycle

[
%
]
R1211X002A/B V
IN
=3.3V
80
82
84
86
88
90
92
94
96
-50
-25
0
25
50
75
100
Temperature Topt
Maximum Duty Cycle

[
%
]
R1211X002C/D V
IN
=3.3V
11) EXT"H" Output Current vs. Temperature
2
3
4
5
6
7
8
-50
-25
0
25
50
75
100
Temperature Topt
EXT"H"ON Resistance
[ohm]
R1211X002X V
IN
=3.3V
12) EXT"L" Output Current vs. Temperature
1
2
3
4
5
-50
-25
0
25
50
75
100
Temperature Topt
EXT"L"ON Resistance
[ohm]
R1211X002X V
IN
=3.3V
(
C)
(
C)
(
C)
(
C)
Rev. 1.10 - 26 -
13) Soft-start Time vs. Temperature
6
8
10
12
14
16
-50
-25
0
25
50
75
100
Temperature Topt
Soft-start Time

[
m
s
]
R1211X002A/B V
IN
=3.3V
6
8
10
12
14
16
-50
-25
0
25
50
75
100
Temperature Topt
Soft-start Time

[
m
s
]
R1211X002C/D V
IN
=3.3V
14) UVLO Detector Threshold vs. Temperature
2100
2150
2200
2250
2300
-50
-25
0
25
50
75
100
Temperature Topt
UVLO Detector Threshold

[
m
V
]
R1211X002X V
IN
=3.3V
15) AMP "H" Output Current vs. Temperature
400
600
800
1000
1200
1400
1600
-50
-25
0
25
50
75
100
Temperature Topt
AMP"H" Output Current
[uA]
R1211X002A/C V
IN
=3.3V
(
C)
(
C)
(
C)
(
C)
Rev. 1.10 - 27 -
16) AMP "L" Output Current vs. Temperature
20
30
40
50
60
70
80
-50
-25
0
25
50
75
100
Temperature Topt
AMP"L" Output Current [uA]
R1211X002A V
IN
=3.3V
20
30
40
50
60
70
80
-50
-25
0
25
50
75
100
Temperature Topt
AMP"L" Output Current
[uA]
R1211X002C V
IN
=3.3V
17) DELAY Pin Charge Current vs. Temperature
2
3
4
5
6
7
-50
-25
0
25
50
75
100
Temperature Topt
DELAY Pin Charge Current
[uA]
R1211X002A/B V
IN
=3.3V
2
3
4
5
6
7
-50
-25
0
25
50
75
100
Temperature Topt
DELAY Pin Charge Current
[uA]
R1211X002C/D V
IN
=3.3V
18) DELAY Pin Detector Threshold vs. Temperature
960
980
1000
1020
1040
-50
-25
0
25
50
75
100
Temperature Topt
DELAY Pin Detector Threshold
[mV]
R1211X002X V
IN
=3.3V
(
C)
(
C)
(
C)
(
C)
(
C)
Rev. 1.10 - 28 -
19) DELAY Pin Discharge Current vs. Temperature
0
2
4
6
8
10
-50
-25
0
25
50
75
100
Temperature Topt
DELAY Pin Discharge Current
[uA]
R1211X002X V
IN
=2.5V
20) CE "L" Input Voltage vs. Temperature
600
700
800
900
1000
1100
1200
-50
-25
0
25
50
75
100
Temperature Topt
CE"L" Input Voltage

[
m
V
]
R1211X002B/D V
IN
=2.5V
21) CE "H" Input Voltage vs. Temperature
600
700
800
900
1000
1100
1200
-50
-25
0
25
50
75
100
Temperature Topt
CE"H" Input Voltage

[
m
V
]
R1211X002B/D V
IN
=6.0V
(
C)
(
C)
(
C)
Rev. 1.10 - 29 -
22) Standby Current vs. Temperature
-0.2
0
0.2
0.4
0.6
0.8
1
-50
-25
0
25
50
75
100
Temperature Topt
Standby Current
[uA]
R1211X002B/D V
IN
=6.0V
23) Load Transient Response
(
C)
4.4
5.0
5.6
Time [5ms/div]
Output Voltage V
OUT
[V]
0
100
200
300
Output Current I
OUT
[mA]
R1211X002A
L=10uH
V
IN
=3.3V , C3=22uF
V
OUT
=5V , I
OUT
=1-100mA
V
OUT
I
OUT
8.8
10.0
11.2
Time [5ms/div]
Output Voltage V
OUT
[V]
0
100
200
300
Output Current I
OUT
[mA]
R1211X002A
L=10uH
V
IN
=3.3V , C3=22uF
V
OUT
=10V , I
OUT
=1-100mA
V
OUT
I
OUT
13.2
15.0
16.8
Time [5ms/div]
Output Voltage V
OUT
[V]
0
100
200
300
Output Current I
OUT
[mA]
R1211X002A
L=10uH
V
IN
=3.3V , C3=22uF
V
OUT
=15V , I
OUT
=1-50mA
V
OUT
I
OUT
Rev. 1.10 - 30 -
4.4
5.0
5.6
Time [5ms/div]
Output Voltage V
OUT
[V]
0
100
200
300
Output Current I
OUT
[mA]
L=10uH
V
IN
=3.3V , C3=22uF
V
OUT
=5V , I
OUT
=1-100mA
R1211X002B
V
OUT
I
OUT
8.8
10.0
11.2
Time [5ms/div]
Output Voltage V
OUT
[V]
0
100
200
300
Output Current I
OUT
[mA]
L=10uH
V
IN
=3.3V , C3=22uF
V
OUT
=10V , I
OUT
=1-100mA
R1211X002B
V
OUT
I
OUT
13.2
15.0
16.8
Time [5ms/div]
Output Voltage V
OUT
[V]
0
100
200
300
Output Current I
OUT
[mA]
L=10uH
V
IN
=3.3V , C3=22uF
V
OUT
=15V , I
OUT
=1-50mA
R1211X002B
V
OUT
I
OUT
4.4
5.0
5.6
Time [5ms/div]
Output Voltage V
OUT
[V]
0
100
200
300
Output Current I
OUT
[mA]
L=22uH
V
IN
=3.3V , C3=22uF
V
OUT
=5V , I
OUT
=1-100mA
R1211X002C
V
OUT
I
OUT
Rev. 1.10 - 31 -
4.4
5.0
5.6
Time [5ms/div]
Output Voltage V
OUT
[V]
0
100
200
300
Output Current I
OUT
[mA]
L=22uH
V
IN
=3.3V , C3=22uF
V
OUT
=5V , I
OUT
=1-100mA
R1211X002D
V
OUT
I
OUT
8.8
10.0
11.2
Time [5ms/div]
Output Voltage V
OUT
[V]
0
100
200
300
Output Current I
OUT
[mA]
L=22uH
V
IN
=3.3V , C3=22uF
V
OUT
=10V , I
OUT
=1-100mA
R1211X002D
V
OUT
I
OUT
8.8
10.0
11.2
Time [5ms/div]
Output Voltage V
OUT
[V]
0
100
200
300
Output
Current I
OUT
[mA]
L=22uH
V
IN
=3.3V , C3=22uF
V
OUT
=10V , I
OUT
=1-100mA
R1211X002C
V
OUT
I
OUT
13.2
15.0
16.8
Time [5ms/div]
Output Voltage V
OUT
[V]
0
100
200
300
Output Current I
OUT
[mA]
L=22uH
V
IN
=3.3V , C3=22uF
V
OUT
=15V , I
OUT
=1-50mA
R1211X002C
V
OUT
I
OUT
Rev. 1.10 - 32 -
24) Power-on Response
0
2
4
6
8
10
12
14
16
0
5
10
15
20
25
Time [5ms/div]
Output Voltage

[
V
]
R1211X002A
L=10uH
V
IN
=3.3V , I
OUT
=10mA
(a)V
OUT
=5V
(b)V
OUT
=10V
(c)V
OUT
=15V
V
IN
0
2
4
6
8
10
12
14
16
0
5
10
15
20
25
Time [5ms/div]
Output Voltage [V
]
R1211X002B
L=10uH
V
IN
=3.3V , I
OUT
=10mA
(a)V
OUT
=5V
(b)V
OUT
=10V
(c)V
OUT
=15V
V
IN
0
2
4
6
8
10
12
14
16
0
5
10
15
20
25
Time [5ms/div]
Output Voltage [V
]
R1211X002C
L=22uH
V
IN
=3.3V , I
OUT
=10mA
(a)V
OUT
=5V
(b)V
OUT
=10V
(c)V
OUT
=15V
V
IN
0
2
4
6
8
10
12
14
16
0
5
10
15
20
25
Time [5ms/div]
Output Voltage [V]
R1211X002D
L=22uH
V
IN
=3.3V , I
OUT
=10mA
(a)V
OUT
=5V
(b)V
OUT
=10V
(c)V
OUT
=15V
V
IN
13.2
15.0
16.8
Time [5ms/div]
Output Voltage V
OUT
[V]
0
100
200
300
Output Current I
OUT
[mA]
L=22uH
V
IN
=3.3V , C3=22uF
V
OUT
=15V , I
OUT
=1-50mA
R1211X002D
V
OUT
I
OUT
Rev. 1.10 - 33 -
25) Turn-on speed with CE pin
0
2
4
6
8
10
12
14
16
0
5
10
15
20
25
Time [5ms/div]
Output Voltage [V
]
R1211X002B
L=10uH
V
IN
=3.3V , I
OUT
=10mA
(a)V
OUT
=5V
(b)V
OUT
=10V
(c)V
OUT
=15V
CE
0
2
4
6
8
10
12
14
16
0
5
10
15
20
25
Time [5ms/div]
Output Voltage

[
V
]
R1211X002D
L=22uH
V
IN
=3.3V , I
OUT
=10mA
(a)V
OUT
=5V
(b)V
OUT
=10V
(c)V
OUT
=15V
CE