FA3630V
1
s
Description
FA3630V is a DC-DC converter controller.
This IC can directly drive a Nch/Pch-MOSFET.
This IC is suitable to reduce converter size because it has
many functions in a small package TSSOP.
s
Features
Low input voltage: 2.5V to 6.5V
2-channels PWM control: Rail-to-rail output
Output impedance of output stage = 3.5
(typ.)
Nch-MOSFET driving (Ch1)
Nch/Pch-MOSFET driving (Ch2)(selected by SEL pin)
Low power consumption: 0.7mA (typ.)
ON/OFFcontrol: Standby current= 0.1
A (typ.)
2% high accuracy reference voltage
Adjustable soft start time and maximum duty cycle
Adjustable built-in timer latch for short circuit protection
Wide range of operation frequency: 100kHz to 1MHz
Package: TSSOP-16 (Thin and small)
s
Applications
Power supply for general equipment
s
Dimensions, mm
TSSOP-16
1
8
9
16
0~8
0.65
6.4
0.1
0.17
+0.02
4.4
5.2
0.2
0.05
0.5
0.08
1.1max
0.07
0.05
0.04
s
Block diagram
FA3630V
CMOS IC
For Switching Power Supply Control
Pin
Pin
Description
No.
symbol
1
ON/OFF
ON/OFF function
2
IN2+
Ch. 2 non-inverting input to error
amplifier
3
IN2
Ch.2 inverting input to error
amplifier
4
FB2
Ch. 2 output of error amplifier
5
SEL
Selection of type of MOSFET
drived
6
GND
Ground
7
CS2
Soft start for Ch. 2
8
OUT2
Ch. 2 output (for Nch or Pch-
MOSFET)
9
OUT1
Ch.1 outout (for Nch-MOSFET)
10
CS1
Soft start for Ch.1
11
VCC
Power supply
12
VREG
Regulated voltage output
13
FB1
Ch.1 output of error amplifier
14
IN1
Ch.1 inverting input to error
amplifier
15
CP
Timing capacitor for timer latch
delay
16
CT
Oscillator timing capacitor
FA3630V
2
s
Electrical characteristics (V
CC
=3.3V, Ta=25
C, C
T
=100pF)
Regulated voltage section for internal control blocks
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Regulated voltage
V
REG
I
REG
=no load
2.156
2.200
2.244
V
Variation with output current
V
RGOUT
V
REG
=0 to 5mV
5
mV
Variation with supply voltage
V
RGLIN
V
CC
=2.5 to 5.5V
8
mV
Variation with temperature
V
RGTa
Ta=20 to +25
C
0.5
%
Ta=+25 to +85
C
0.5
%
Reference voltage section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Reference voltage
V
REF
0.98
1.00
1.02
V
Variation with supply voltage
V
RGLIN
V
CC
=2.5 to 5.5V
1
5
mV
Variation with temperature
V
RGTa
Ta=20 to +25
C
0.5
%
Ta=+25 to +85
C
0.5
%
s
Recommended operating conditions
Item
Symbol
Min.
Max.
Unit
Power supply voltage
V
CC
2.5
5.5
V
Input voltage for logic input
V
LOG
0
5.5
V
Oscillation frequency
f
OSC
100
1000
kHz
Oscillator section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Oscillation frequency
f
OSC
C
T
=100pF
437
485
533
kHz
High level voltage
V
OSCH
C
T
=100pF
1.39
V
Low level voltage
V
OSCL
C
T
=100pF
0.77
V
Variation with supply voltage
f
dV
V
CC
=2.5 to 5.5V
1
5
%
Variation with temperature
f
dT
Ta=20 to +25
C
5
%
Ta=+25 to +85
C
5
%
s
Absolute maximum ratings
Item
Symbol
Rating
Unit
Power supply voltage
V
CC
6.5
V
Source peak current of OUT1/2
I
OUT+
500
mA
Sink peak current of OUT1/2
I
OUT
500
mA
Input voltage for logic input
V
LOG
0.3 to +6.5
V
Output current of VREG
I
REGMAX
10
mA
Total power dissipation*
P
d
300
mW
Junction temperature
T
J
125
C
Ambient temperature
T
OP
20 to +85
C
Storage temperature
T
stg
40 to +125
C
*
Ta 25
C
Error amplifier section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Input offset voltage
V
IOF
3
10
mV
Common mode input voltage
V
ICOM
0.2
1.5
V
DC open loop gain
A
VOL
70
75
dB
Unity gain band width
f
T
1.6
MHz
Output sink current
I
FBL
V
FB
=0.5V
2.0
2.5
3.0
mA
Output source current
I
FBH
V
FB
=
V
REG
0.5V
160
125
90
A
FA3630V
3
ON/OFF logic input signal section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Input range for ON mode
V
ONH
V
CC
=2.5V to 5.5V
2.0
V
Input range for OFF mode
V
ONL
V
CC
=2.5V to 5.5V
0.5
V
SEL logic input signal section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Input range for driving Nch-MOSFET
V
SELH
V
cc
0.5
V
Input range for driving Pch-MOSFET
V
SELL
0.5
V
Timer latch protection section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Threshold voltage of CP
V
CPTH
1.55
1.70
1.85
V
Charge current of CP
I
CP
V
CP=
V
REG
0.5V
2.5
2.1
1.7
A
Threshold voltage of FB1/FB2
V
FBTL
1.56
1.73
1.90
V
Soft-start section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Threshold voltage of CS1/2
V
CS 0
Duty cycle=0%
0.74
0.79
0.84
V
Threshold voltage of CS1/2
V
CS 100
Duty cycle=100%
1.29
1.34
1.39
V
Overall device
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Standby current
I
CC0
ON/OFF=GND
0.1
5
A
Operating average current
I
CC
OUT1, OUT2: Open
0.7
1
mA
Output duty=100%
(Reference value) OUT1, OUT2: Open
1.5
mA
IN and FB: Shorted
Output section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
ON resistance
OUT1 ( High / Low )
R
ON
I
OUT
=
100mA
3.5
7
OUT2 ( High / Low )
V
CC
=3.3V
3.5
7
Rise time
OUT1
t
r
C
LOAD
=1000pF
25
35
ns
OUT2
V
CC
=3.3V
25
35
ns
Fall time
OUT1
t
f
C
LOAD
=1000pF
25
35
ns
OUT2
V
CC
=3.3V
25
35
ns
FA3630V
4
s
Characteristic curves (Ta=25
C)
Supply current (I
CC
) vs. supply voltage (V
CC
)
Oscillation frequency (f
OSC
) vs. timing capactior(C
T
)
0
1
2
3
4
5
6
V
CC
[V]
I
CC
[mA]
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
Output duty cycle vs. FB terminal voltage (V
FB
)
Output duty cycle vs. CS terminal voltage (V
CS
)
0
0.5
1
1.5
2
V
FB
[V]
Output duty cycle [%]
0
10
20
30
40
50
60
70
80
90
100
Oscillation frequency (f
OSC
) vs. ambient temperature (Ta)
Reference voltage (V
REF
) vs. ambient temperature (Ta)
10
30
50
70
90
Ta [
C]
f
OSC
[kH
Z
]
440
450
460
470
480
490
500
30
10
Vcc=3.3V
C
T
=100pF
0
0.5
1
1.5
2
V
CS
[V]
Output duty cycle [%]
0
10
20
30
40
50
60
70
80
90
100
10
30
50
70
90
Ta[
C]
V
REF
[V]
0.99
0.995
1
1.005
1.01
30
10
10
100
500
1000
C
T
[pF]
fosc [kH
Z
]
10
100
1000
10000
FA3630V
5
L-level output voltage (V
OL1
) vs. output sink current (I
sink1
)
H-level output voltage (V
OH1
) vs. output source current (I
SOURCE1
)
0
50
100
150
200
250
300
I
SINK
1 [mA]
V
OL1
[V]
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
2.4
V
CC
=3.3V
L-level output voltage (V
OL2
) vs. output sink current (I
sink2
)
H-level output voltage (V
OH2
) vs. output source current (I
SOURCE2
)
0
50
100
150
200
250
300
I
SINK
2
[mA]
V
OL2
[V]
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
2.4
V
CC
=3.3V
Error amplifier voltage gain (Av) / phase (
) vs. frequency (f)
Condition: Open loop
[H
Z
]
[deg]
A
v
[dB]
0
20
40
60
80
100
120
140
160
180
100
1K
10K
100K
1M
10M
40
20
Voltage gain
Phase
2.2
2.4
0
50
100
150
200
250
300
I
SOURCE
1 [mA]
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
V
CC
=3.3V
V
CC
V
OH1
[V]
0
50
100
150
200
250
300
I
SOURCE
2 [mA]
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
2.4
V
CC
=3.3V
V
CC
V
OH2
[V]
FA3630V
6
s
Application circuit
Parts tolerances characteristics are not defined in the circuit design
sample shown above. When designing an actual circuit for a product,
you must determine parts tolerances and characteristics for safe and
economical operation.
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