MB3843

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 MB3843 is pulse width modulation (PWM) DC/DC converter ICs with independent output voltage and current setting capability.

The use of MB3843 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 MB3843 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