FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27701-4E
ASSP For Power Management Applications
(Secondary battery)
DC/DC Converter IC for Charging
MB3832A
s
DESCRIPTION
The MB3832A is a pulse width modulation (PWM) DC/DC converter IC, incorporating a current detector amplifier
and error amplifiers (2 circuits) to control the output voltage and current independently. It is suitable for down-
conversion.
With an on-chip reference voltage generator, the MB3832A is best suited for use in applications such as lithium-
ion battery (1-cell to 3-cell) chargers.
s
FEATURES
• High precision reference voltage source: 2.5 V
±
0.5% (+25°C)
: 2.5 V
±
1.0% (–10°C to +85°C)
• High frequency operating capability: 500 kHz Max.
• Wide operating supply voltage range: 3.6 V to 18 V
• On-chip current detector amplifier with wide in-phase input voltage range: 0 V to V
CC
• On-chip standby function
• On-chip triangular waveform oscillator capable of operating in external synchronization
• On-chip, timer-latch short-circuit protection circuit
• Internal totem-pole output stage supporting P-channel MOS FETs and PNP transistors
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PACKAGE
20-pin plastic SSOP
(FPT-20P-M03)
MB3832A
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PIN ASSIGNMENT
(TOP VIEW)
VREF : 1
RT : 2
CT : 3
SYNC : 4
CSCP : 5
FB1 : 6
−IN1
: 7
+IN1
: 8
−INC
: 9
+INC
: 10
20 : VE
19 : OUT
18 : V
CC
17 : CTL
16 : DTC
15 : FB2
14 :
−IN2
13 :
+IN2
12 : COUT
11 : GND
(FPT-20P-M03)
2
MB3832A
s
PIN DESCRIPTION
Pin no.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Pin name
VREF
RT
CT
SYNC
CSCP
FBI
–IN1
+IN1
–INC
+INC
GND
COUT
+IN2
–IN2
FB2
DTC
CTL
V
CC
OUT
VE
I/O
O
—
—
I
—
O
I
I
I
I
—
O
I
I
O
I
I
—
O
—
Descriptions
Reference voltage output terminal
Connection terminal for triangular wave frequency setting resistor
Connection terminal for triangular wave frequency setting capacitor
External synchronous signal input terminal
Connection terminal for time constant setting capacitor for timer-latch short-
circuit protection circuit
Error amplifier 1 output terminal
Error amplifier 1 inverted input terminal
Error amplifier 1 non-inverted input terminal
Current detector amplifier inverted input terminal
Current detector amplifier non-inverted input terminal
Ground terminal
Current detector amplifier output terminal
Error amplifier 2 non-inverted input terminal
Error amplifier 2 inverted input terminal
Error amplifier 2 output terminal
Connection terminal for dead time/soft start time setting resistor/capacitor
Power supply control input terminal
“H” level: Active state
“L” level: Standby state
Power supply terminal
Totem-pole output terminal
Connector terminal for output sink current setting resistor
I: Input pin, O: Output pin
3
MB3832A
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BLOCK DIAGRAM
COUT
12
FB2 15
−IN2
14
+IN2
13
FB1 6
−IN1
7
+IN1
8
−
+
−
+
+
+
+
−
Error
Amp.2
Current
Amp.
−
×
25
+
PWM
Comp.
−INC +INC
9
10
Out
100 kΩ
18 V
CC
Error
Amp.1
19 OUT
DTC 16
SCP
Comp.
−
−
+
−
+
1.1 V
bias
CSCP 5
S
R
Latch
UVLO
OSC
Ref
bias
DTC
Comp.
1.9 V
1.3 V
1V
20 VE
1
µA
2.1 V
V
CC
CTL
17 CTL
2.5 V
4
2
3
CT
1
VREF
11
GND
SYNC RT
4
MB3832A
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ABSOLUTE MAXIMUM RATINGS
Parameter
Power supply voltage
Control input voltage
Output current
Peak output current
Allowable dissipation
Storage temperature
Symbol
V
CC
V
CTL
I
O
I
O
P
D
Tstg
Condition
—
—
OUT terminal, DC
OUT terminal,
Duty 5%
Ta
+25°C
—
Rating
Min
—
—
—
—
—
–55
Max
20
20
50
600
540*
+125
Unit
V
V
mA
mA
mW
°C
*: When mounted on a 10 cm-square dual-sided epoxy base board
WARNING:
Semiconductor devices can be permanently damaged by application of stress (voltage, current,
temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
s
RECOMMENDED OPERATING CONDITIONS
Parameter
Power supply voltage
Reference voltage output cur-
rent
Input voltage
Control input voltage
SYNC input voltage
Output current
Oscillator frequency
Timing capacitance
Timing resistance
Short detection capacitance
Operating temperature
Symbol
V
CC
I
OR
Condition
—
—
+IN1, –IN1, +IN2,
–IN2 terminal
+INC, –INC terminal
V
CTL
V
SYNC
I
O
f
OSC
C
T
R
T
C
SCP
Ta
CTL terminal
SYNC terminal
OUT terminal, DC
—
—
—
—
—
Value
Min
3.6
–1
0
0
0
0
—
10
100
8.2
—
–30
Typ
16
—
—
—
—
—
—
200
390
12
0.1
+25
Max
18
0
V
CC
– 0.9
V
CC
18
V
CC
30
500
2200
51
1.0
+85
Unit
V
mA
V
V
V
V
mA
kHz
pF
kΩ
µF
°C
V
IN
WARNING:
The recommended operating conditions are required in order to ensure the normal operation of the
semiconductor device. All of the device’s electrical characteristics are warranted when the device is
operated within these ranges.
Always use semiconductor devices within their recommended operating condition ranges. Operation
outside these ranges may adversely affect reliability and could result in device failure.
No warranty is made with respect to uses, operating conditions, or combinations not represented on
the data sheet. Users considering application outside the listed conditions are advised to contact their
FUJITSU representatives beforehand.
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