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Электронный компонент: MAX867ESA

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_______________General Description
The MAX866 and MAX867 are ultra-small, high-efficiency,
CMOS, step-up, DC-DC switching regulators for 1-cell
battery-powered systems. The MAX866 accepts a posi-
tive input voltage between 0.8V and V
OUT
and converts it
to a higher, pin-selectable output voltage of 3.3V or 5V.
The MAX867 adjustable version accepts 0.8V to 6.0V
input voltages and generates a higher adjustable output
voltage in the 2.7V to 6.0V range. Typical efficiencies are
greater than 80%. Typical no-load supply current is
100A (1A in shutdown).
The MAX866/MAX867 combine ultra-low quiescent sup-
ply current and high efficiency to give maximum battery
life. Its high switching frequency permits the use of
small, low-cost inductors and capacitors. Additionally,
internal peak-current limiting protects the IC.
________________________Applications
Pagers
Remote Controls
Detectors
1-Cell Battery-Operated Equipment
Backup Supplies
____________________________Features
o
0.8V to 6.0V Input Supply Voltage
o
0.9V Guaranteed Start-Up Supply Voltage
o
>80% Efficiency Over Wide Load Range
o
100A No-Load Battery Current (V
OUT
= 3.3V)
o
1A Shutdown Mode
o
Up to 250kHz Switching Frequency
o
1.5% Reference Tolerance
o
Low-Battery Detector (LBI/LBO)
o
Available in Ultra-Small 8-Pin MAX Package
(1.11mm high)
o
Circuit Fits in 0.2in
2
______________Ordering Information
MAX866/MAX867
3.3V/5V or Adjustable-Output,
Single-Cell DC-DC Converters
________________________________________________________________
Maxim Integrated Products
1
1
2
3
4
8
7
6
5
LX
GND
OUT
LBI
LBO
REF
3/5
SHDN
MAX866
SO/MAX
TOP VIEW
1
2
3
4
8
7
6
5
LX
GND
OUT
LBI
LBO
REF
FB
SHDN
MAX867
SO/MAX
_________________Pin Configurations
MAX866
SHDN
3/5
REF
LX
GND
OUT
INPUT
0.8V TO V
OUT
MBRS0520LTI
OR 1N5817
OUTPUT
5V OR 3.3V
LBO
47
F
0.22
F
330
H
LOW-BATTERY
DETECTOR OUTPUT
ON/OFF
3V/5V SELECT
LBI
LOW-BATTERY
DETECTOR
INPUT
__________Typical Operating Circuit
19-0374; Rev 1; 5/96
PART
TEMP. RANGE PIN-PACKAGE
MAX866
C/D
0C to +70C
Dice*
MAX866ESA
-40C to +85C
8 SO
MAX867
C/D
0C to +70C
Dice*
MAX867ESA
-40C to +85C
8 SO
* Dice are tested at T
A
= +25C only.
EVALUATION KIT
AVAILABLE
MAX866EUA
-40C to +85C
8 MAX
MAX867EUA
-40C to +85C
8 MAX
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
V
MAX866/MAX867
3.3V/5V or Adjustable-Output,
Single-Cell DC-DC Converters
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 2, V
IN
= 1.2V, I
LOAD
= 0mA, T
A
= +25C, unless otherwise noted.)
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage (OUT to GND) ...................................-0.3V, +7V
Switch Voltage (LX to GND) .......................................-0.3V, +7V
S
--
H
--
D
--
N
, LBO to GND ....................................................-0.3V, +7V
LBI, REF, 3/
5
, FB to GND ............................-0.3V, (V
OUT
+ 0.3V)
Reference Current (I
REF
) ..................................................2.5mA
Continuous Power Dissipation (T
A
= +70C)
SO (derate 5.88mW/C above +70C) .........................471mW
MAX (derate 4.1mW/C above +70C) ......................330mW
Reverse Battery Current (T
A
+45C) (Note 1) ................750mA
Operating Temperature Ranges
MAX86_C/D .......................................................0C to +70C
MAX86_E_A ....................................................-40C to +85C
Junction Temperature .....................................................+150C
Storage Temperature Range ............................-65C to +160C
Lead Temperature (soldering, 10sec) ............................+300C
Note 1:
Reverse battery current is measured from the
Typical Operating Circuit's battery input terminal to GND when the battery is
connected backwards. A reverse current of 750mA will not exceed the package dissipation limits but, if left for an extended
time (more than ten minutes), may degrade performance.
With falling edge
3/
5
= 3V, -20A
REF load
250A, C
REF
= 0.22F
No REF load
0.9V
V
IN
3V
I
LOAD
= 0mA, 3/
5
= 3V, LBI = 1.5V,
V
OUT
= 3.47V, FB = 1.5V
CONDITIONS
V
1.22
1.25
1.28
LBI Input Threshold
%
0.8
2.0
Reference Load Regulation
V
1.22
1.25
1.28
Reference Voltage
mA
500
A
1
Shutdown Quiescent Current
(Note 4)
A
27
60
Quiescent Supply Current in
3.3V mode (Note 4)
4.80
5.0
5.20
3.17
3.3
3.43
4.80
5.0
5.20
4.75
5.0
5.25
3.13
3.3
3.47
4.75
5.0
5.25
Output Voltage
(Note 2)
UNITS
MIN
TYP
MAX
PARAMETER
Peak Inductor Current Limit
MAX866, 3/
5
= 0V, 0mA
I
LOAD
6mA
MAX866, 3/
5
= 3V, 0mA
I
LOAD
8mA
MAX867, V
OUT
= 5V, 0mA
I
LOAD
6mA
MAX866, 3/
5
= 0V, 0mA
I
LOAD
6mA
MAX866, 3/
5
= 3V, 0mA
I
LOAD
8mA
MAX867, V
OUT
= 5V, 0mA
I
LOAD
6mA
S
--
H
--
D
--
N
= 0V, 3/
5
= 3V, LBI = 1.5V, V
OUT
= 3.47V,
FB = 1.5V
0.9V
V
IN
3V
MAX866, 3/
5
= 0V, 4.8V
V
LOAD
5.2V
MAX866, 3/
5
= 3V, 3.17V
V
LOAD
3.43V
MAX867, V
OUT
= 5V, 4.8V
V
LOAD
5.2V
MAX866, 3/
5
= 0V, 4.8V
V
LOAD
5.2V
MAX866, 3/
5
= 3V, 3.17V
V
LOAD
3.43V
MAX867, V
OUT
= 5V, 4.8V
V
LOAD
5.2V
6
9
8
13
6
9
10
15
15
23
mA
10
15
Maximum Load Current
(Note 2)
0.9V
V
IN
3V,
T
A =
T
MIN TO
T
MAX
(Note 3)
1.2V
V
IN
3V
V
0.8
0.9
Minimum Start-Up
Supply Voltage
Output set for 3.3V, measured at V
IN
in Figure 2, V
IN
= 1.5V
A
100
No-Load Battery Current
1.2V
V
IN
3V
MAX866, 3/
5
= 0V, 0mA
I
LOAD
10mA
MAX866, 3/
5
= 3V, 0mA
I
LOAD
15mA
MAX867, V
OUT
= 5V, 0mA
I
LOAD
10mA
4.80
5.0
5.20
3.17
3.3
3.43
4.80
5.0
5.20
MAX866/MAX867
3.3V/5V or Adjustable-Output,
Single-Cell DC-DC Converters
_______________________________________________________________________________________
3
100
0
10
0.01
0.1
1
10
100
1000
EFFICIENCY vs. LOAD CURRENT (V
OUT
= 3.3V)
30
20
MAX866/667-01
LOAD CURRENT (mA)
EFFICIENCY (%)
40
50
60
70
80
90
TOP TO BOTTOM:
V
IN
= 2.0V
V
IN
= 1.5V
V
IN
= 1.25V
V
IN
= 1.0V
V
IN
= 0.75V
V
IN
= 0.5V
L = SUMIDA CD73-331 (330
H, 1.5
)
100
90
0
0.01
1
0.1
10
100
EFFICIENCY vs. LOAD CURRENT (V
OUT
= 5.0V)
20
MAX866/67-04
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
TOP TO BOTTOM:
V
IN
= 2.0V
V
IN
= 1.5V
V
IN
= 1.25V
V
IN
= 1.0V
V
IN
= 0.75V
L = COILCRAFT D01608-334 (330
H, 2.9
)
100
90
0
0.01
1
0.1
10
100
EFFICIENCY vs. LOAD CURRENT (V
OUT
= 3.3V)
20
MAX866/67-02
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
TOP TO BOTTOM:
V
IN
= 2.0V
V
IN
= 1.5V
V
IN
= 1.25V
V
IN
= 1.0V
V
IN
= 0.75V
L = COILCRAFT D01608-334 (330
H, 2.9
)
100
0
10
0.01
0.1
1
10
100
1000
EFFICIENCY vs. LOAD CURRENT (V
OUT
= 5.0V)
30
20
MAX866/667-03
LOAD CURRENT (mA)
EFFICIENCY (%)
40
50
60
70
80
90
TOP TO BOTTOM:
V
IN
= 2.0V
V
IN
= 1.5V
V
IN
= 1.25V
V
IN
= 1.0V
V
IN
= 0.75V
V
IN
= 0.5V
L = SUMIDA CD73-331 (330
H, 1.5
)
1200
0
0
0.2
0.4
0.6
0.8 1.0
1.2
1.4 1.6
NO-LOAD BATTERY CURRENT
vs. BATTERY VOLTAGE (V
OUT
= 3.3V)
400
200
1000
MAX866/67-05
BATTERY VOLTAGE (V)
BATTERY CURRENT (
A)
800
600
DECREASING
BATTERY
VOLTAGE
INCREASING
BATTERY
VOLTAGE
4000
0
0
0.2
0.4
0.6
0.8 1.0
1.2
1.4 1.6
NO-LOAD BATTERY CURRENT
vs. BATTERY VOLTAGE (V
OUT
= 5V)
1000
500
3500
MAX866/67-06
BATTERY VOLTAGE (V)
BATTERY CURRENT (
A)
2000
2500
3000
1500
DECREASING
BATTERY
VOLTAGE
INCREASING
BATTERY
VOLTAGE
__________________________________________Typical Operating Characteristics
(Circuits of Figure 2, T
A
= +25C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 2, V
IN
= 1.2V, I
LOAD
= 0mA, T
A
= +25C, unless otherwise noted.)
Note 2:
Output current specified with circuit of Figure 2 and CoilCraft D01608-334 inductor for test purposes only. More (or less)
output current can be supplied with other coil types depending on inductance value and coil resistance. See
Typical Operating
Characteristics for other coil types. Output voltage and output current are guaranteed over this V
IN
operating range once the
device has started up. Actual V
IN
start-up voltage depends on load current.
Note 3:
Output voltage specifications over temperature are guaranteed by design to limits that are 6 sigma from either side of the mean.
Note 4:
Current measured into OUT. V
OUT
is forced to 3.47V to maintain LX off when measuring device current.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
S
--
H
--
D
--
N
, 3/
5
Input Voltage High
0.32 x V
OUT
V
S
--
H
--
D
--
N
, 3/
5
, FB, LBI Input Current
LBI = 1.5V, FB = 1.5V,
S
--
H
--
D
--
N
= 0V or 3V, 3/
5
= 0V or 3V
40
100
nA
FB Voltage
MAX867, output in regulation
1.22
1.25
1.28
V
Output Voltage Range
MAX867
2.7
6.0
V
S
--
H
--
D
--
N
, 3/
5
Input Voltage Low
0.08 x V
OUT
V
LBO Output Leakage Current
LBO = 5V
1
A
LBI Input Hysteresis
25
mV
LBO Output Voltage Low
I
SINK
= 2mA, open-drain output
0.4
V
MAX866/MAX867
3.3V/5V or Adjustable-Output,
Single-Cell DC-DC Converters
4
_______________________________________________________________________________________
____________________________Typical Operating Characteristics (continued)
(Circuits of Figure 2, T
A
= +25C, unless otherwise noted.)
1.5
1.4
1.3
1.2
1.1
1.0
0.8
0.5
0.1
1
100
START-UP INPUT VOLTAGE vs. LOAD CURRENT
(V
OUT
= 3.3V)
0.7
0.6
0.9
MAX186-14A
MAX866/67-07
LOAD CURRENT (mA)
START-UP INPUT VOLTAGE (V)
10
100H
47H
220H
330H
1mH
1.5
1.4
1.3
1.2
1.1
1.0
0.8
0.5
0.1
1
100
START-UP INPUT VOLTAGE vs. LOAD CURRENT
(V
OUT
= 5V)
0.7
0.6
0.9
MAX186-14A
LOAD CURRENT (mA)
START-UP INPUT VOLTAGE (V)
10
100H
47H
220H
330H
MAX866/67-08
1
10
1000
INPUT VOLTAGE vs. LOAD CURRENT
(V
OUT
= 3.3V)
MAX186-14A
MAX866/67-09
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
100
100H
47H
22H
330H
1mH
3.0
2.5
1.5
0
1.0
0.5
2.0
1
10
1000
INPUT VOLTAGE vs. LOAD CURRENT
(V
OUT
= 5V)
MAX186-14A
MAX866/67-10
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
3.0
2.5
1.5
0
1.0
0.5
2.0
100
22H
330H
47H
100H
A: 3.3V OUTPUT VOLTAGE, AC COUPLED 20mV/div
B: INPUT VOLTAGE (0.9V AND 1.4V) 500mV/div
I
LOAD
= 10mA, C
OUT
= 47
F
MAX866 LINE-TRANSIENT RESPONSE
(3.3V MODE)
1ms/div
A
B
5
0
REFERENCE VOLTAGE
vs. REFERENCE CURRENT
6
10
MAX866/67-11
REFERENCE LOAD CURRENT (
A)
V
REF
LOAD REGULATION (mV)
8
7
100
200
9
50
150
250
4
3
2
1
0
A: 5.0V OUTPUT VOLTAGE, AC COUPLED 20mV/div
B: INPUT VOLTAGE (0.9V AND 1.4V) 500mV/div
I
LOAD
= 10mA, C
OUT
= 47
F
MAX866 LINE-TRANSIENT RESPONSE
(5V MODE)
1ms/div
A
B
MAX866/MAX867
3.3V/5V or Adjustable-Output,
Single-Cell DC-DC Converters
_______________________________________________________________________________________
5
A: 5.0V OUTPUT VOLTAGE, AC COUPLED 20mV/div
B: OUTPUT CURRENT (0mA AND 10mA) 5mV/div
(TEKTRONIX P6042 CURRENT PROBE)
I
LOAD
= 5mA, C
OUT
= 47
F, V
IN
= 1.25V
MAX866 LOAD-TRANSIENT RESPONSE
(5V MODE)
1ms/div
A
B
A: 3.3V OUTPUT VOLTAGE, 2V/div
B: SHDN INPUT VOLTAGE (0V AND 5V) 2V/div
I
LOAD
= 10mA
MAX866 SHUTDOWN RESPONSE
(3.3V MODE)
10ms/div
A
B
A: 5.0V OUTPUT VOLTAGE, 2V/div
B: SHDN INPUT VOLTAGE (0V AND 5V) 5V/div
I
LOAD
= 10mA
MAX866 SHUTDOWN RESPONSE
(5V MODE)
10ms/div
A
B
____________________________Typical Operating Characteristics (continued)
(Circuits of Figure 2, T
A
= +25C, unless otherwise noted.)
1.250
-60
MAX867 LBI AND FB THRESHOLD
vs. TEMPERATURE
1.260
MAX866/67-24
TEMPERATURE (C)
LBI, FB VOLTAGE (V)
0
60
-20
-40
20
80
40
100
1.240
LBI
VFB (MAX867)
0
-60
MAX866 OUTPUT VOLTAGE ERROR
vs. TEMPERATURE
0.5
MAX866/67-25
TEMPERATURE (C)
OUTPUT VOLTAGE ERROR (%)
0
60
-20
-40
20
80
40
100
-0.5
5V MODE
I
LOAD
= OA
3.3V MODE
-60
START-UP VOLTAGE
vs. TEMPERATURE
1.0
0.9
0.8
0.7
0.6
MAX866/67-26
TEMPERATURE (C)
START-UP VOLTAGE (V)
0
60
-20
-40
20
80
40
100
0.5
I
LOAD
= 0A
A: 3.3V OUTPUT VOLTAGE, AC COUPLED 20mV/div
B: OUTPUT CURRENT (0mA AND 10mA) 5mV/div
(TEKTRONIX P6042 CURRENT PROBE)
I
LOAD
= 5mA, C
OUT
= 47
F, V
IN
= 1.25V
MAX866 LOAD-TRANSIENT RESPONSE
(3.3V MODE)
1ms/div
A
B