FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27502-5E
ASSP For Power Supply Applications
Bi-CMOS
Battery Backup IC
MB3790
s DESCRIPTION
The MB3790 is designed to control power supplies to SRAM, logic IC, or other circuit devices and protects them
against momentary power failures by using backup batteries. In addition to its function to supply the power to
these devices, it has a function to switch the source of power to the primary or secondary backup battery when
the power supply voltage drops below a predetermined level. Also, it outputs a reset signal when the power supply
turns on or off or when a fault occurs in the power supply.
Ideally designed as a single-chip IC for power supply control, the MB3790 consumes only a minimal current and
comes in a thin-type package. Therefore, it is best suited for power supply control in memory cards and similar
other devices.
s FEATURES
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Input circuit current consumption when non-loaded: 50 µA [Typ]
Output drive current: 200 mA [Max]
Resistance between input and output: 0.5 ohms [Typ]
Input power-down detection level: 4.2 V ± 2.5 %
(Continued)
s PACKAGES
16-pin Plastic SOP
20-pin Plastic TSSOP*
(FPT-16P-M06)
(FPT-20P-M04)
* : Since the TSSOP is an extremely thin package, use a partial heating method when mounting the device.
