Fujitsu MB3845, MB3842 manual Description, Features, Package, Fujitsu Semiconductor Data Sheet

FUJITSU SEMICONDUCTOR

DATA SHEET

DS04-27604-2E

ASSP For Power Supply Applications

Power Management 2-ch Switch IC

MB3842/MB3845

■DESCRIPTION

The MB3842/3845 is a power management switch with built-in 2-channel low-on resistance (typ. 100mΩ) switch. Output control is by means of a control signal, and the MB3842 is designed for high-active operation (output on when EN is Hi), while the MB3845 is designed for low-active operation (output on when EN is low.)

To provide adaptability to a variety of operations, the MB3842/3845 features low input voltage (VIN > 2.5V) operation and stable low-on resistance independent of input voltage. The switching current limit can be set from 100mA to 600mA by using external resistance, and when overcurrent conditions are detected the OC output goes low to provide an external notification signal.

VIN is divided between the two channels, which operate independently of each other.

In addition, an off-state reverse current prevention function is provided to ensure accurate on/off switching action.

■FEATURES

•Low on resistance switch (typ. 100mΩ)

•Low input voltage operation (2.5 V to 5.5 V)

•Switch current (max. 0.6 A)

• UVLO	:VIN threshold	2.3V/2.1 V hysteresis 200 mV
• ENABLE	:EN threshold	EN 1.4V/1.6 V for MB3842,			EN	1/2 VIN for MB3845
	:Power supply current at output off = 0∝A EN < 0.8V for MB3842,			= VIN for MB3845
			EN

•External setting for soft start time and switch current limit.

•Over-temperature detection (switch latched off), over-current detection (not latched)

•OC pin flag set following overcurrent detection, over-temperature detection, or UVLO detection.

•Reverse current prevention at OFF (VIN ≥ 1.5 V)

•Either channel may be operated alone.

■PACKAGE

20-pin plastic SSOP

(FPT-20P-M03)