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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
Output voltage
Part number
3-cell
12.6 V/12.3 V
MB3813A
2-cell
8.4 V/8.2 V
MB3833A
1-cell
4.2 V/4.1 V
MB3843
MB3833A Maximum Ratings
Parameter
Symbol
Condition
Value
Unit
Min.
Max.
Power supply voltage
VCC
-
-
20
V
Input voltage
VIN
Vin1, IN1, IN2
-
20
V
Control input voltage
VCTL
-
-
20
V
Select input voltage
VSEL
-
-
20
V
Output current
IO
-
-
50
mA
Peak output current
IO
Duty5% (t = fOSC*Duty)
-
500
mA
Allowable dissipation
PD
Ta+25°C
-
440*
mW
Storage temperature
Tstg
-
55
+125
°C
* :When mounted on a 10 by 10 centimeters 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.
MB3833A 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 VCC • 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