FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27700-3E
ASSP For Power Management Applications (Secondary battery)
Lithium Ion Battery Charger DC/DC Converter IC
(High Precision with Constant-current Function)
MB3813A/MB3833A/MB3843
s
DESCRIPTION
The FUJITSU MB3813A/33A/43 are pulse width modulation (PWM) DC/DC converter ICs with independent output
voltage and current setting capability.
The use of on-chip output setting resistance enables high precision output voltage control. Also, an output voltage
switching feature for use with either graphite-electrode or coke-electrode lithium-ion batteries makes this IC ideal
for internal battery chargers in notebook personal computers and similar applications.
Cell count
3-cell
2-cell
1-cell
8.4 V/8.2 V
4.2 V/4.1 V
Output voltage
12.6 V/12.3 V
MB3813A
MB3833A
MB3843
Part number
s
FEATURES
•
•
•
•
•
Output setting resistance is on-chip for high precision output voltage:
±1.0%
SEL pin enables output voltage selection
High precision reference voltage source: 2.5 V
±
1.0%
High frequency operating capability: max. 500 kHz
On-chip current detector amplifier with wide in-phase input voltage range: 0 V to V
CC
(Continued)
s
PACKAGE
16-pin plastic SSOP
(FPT-16P-M05)
MB3813A/MB3833A/MB3843
(Continued)
• On-chip standby function
• On-chip input voltage detector circuit
• On-chip soft start control circuit
• On-chip output overshoot protection circuit for rapid load changes
• On-chip totem-pole output circuits for P-ch. MOS FET devices
2
MB3813A/MB3833A/MB3843
s
PIN ASSIGNMENT
(Top view)
Vin1 : 1
IN1 : 2
IN2 : 3
-IN2 : 4
-IN1 : 5
FB : 6
CTL : 7
Vin2 : 8
16 : GND
15 : OUT
14 : V
CC
13 : CT
12 : RT
11 : CS
10 : SEL
9 : VREF
(FPT-16P-M05)
3
MB3813A/MB3833A/MB3843
s
PIN DESCRIPTION
Pin no.
1
2
3
4
5
6
7
8
9
10
Symbol
Vin1
IN1
IN2
-IN2
-IN1
FB
CTL
Vin2
VREF
SEL
I/O
I
I
I
I
I
O
I
I
O
I
Descriptions
Input voltage detector block (VLDET) input pin
Current detector amplifier (Current Amp.) input pin
Output voltage feedback input pin
Error amplifier (Error Amp.2) inverted input pin
Error amplifier (Error Amp.1) inverted input pin
Error amplifier (Error Amp.1, 2 common) output pin
Power supply control pin
An “L” level signal input to the CTL pin sets the IC in standby mode.
DC/DC converter charging current setting input pin
Reference voltage output pin
Output voltage switching pin
“L” level output voltage: MB3813A 12.6 V
MB3833A 8.4 V
MB3843 4.2 V
“H” level output voltage: MB3813A 12.3 V
MB3833A 8.2 V
MB3843 4.1 V
Soft start capacitor connection pin
Triangular wave frequency setting resistor connection pin
Triangular wave frequency setting capacitor connection pin
Power supply pin
Totem-pole output pin
Ground pin
11
12
13
14
15
16
CS
RT
CT
V
CC
OUT
GND
—
—
—
—
O
—
4
-IN2
4
10
SEL
<Current Amp. block>
<OUT block>
<PWM Comp. block>
–
+
+
–
OUT
15
100 kΩ
V
CC
14
2
<Error Amp. 2 block>
s
BLOCK DIAGRAM
IN1
+
×25
–
Vin2
8
3
IN2
–
+
+
GND
16
R1
*1
<Error Amp. 1 block>
5
-IN1
R2
2.5 kΩ
2.44 V
FB
2.0 V
1.0 V
2.5 V
<SEL block>
6
1
µA
*1:
CS
bias
<SOFT block>
V
CC
*2:
11
Vin1
R3 *2
<VLDET block>
1
<OSC block>
<UVLO block>
+
<Ref block>
MB3813A 10.1 kΩ
MB3833A 5.9 kΩ
MB3843 1.7 kΩ
MB3813A 194 kΩ
MB3833A 120 kΩ
MB3843 100 kΩ
<CTL block>
(2.5 V)
2.5 V
R4
25 kΩ
–
1.26 V
12
13
RT
CT
9
VREF
7
CTL
(16 pins)
MB3813A/MB3833A/MB3843
5
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