MB3813A

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
• 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


Pinout




Specifications

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.


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 MB3813A 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