DS04-27216-4E

FUJITSU SEMICONDUCTOR

DATA SHEET

ASSP For Power Supply Applications

BIPOLAR

Switching Regulator Controller

MB3817

s DESCRIPTION

The MB3817 is a pulse width modulator (PWM) type switching regulator controller IC designed for low-voltage

and high-speed operation. This can be used in applications as down-conversion or down/up-conversion (Zeta

method) .

With fewer external components and faster operating speed, the MB3817 enables reduction in power supply unit

size, making it ideal for use with internal power supplies in compact, high-performance portable devices.

s FEATURES

• Wide range of operating power supply voltages : 2.5 V to 18 V

• Built-in high-precision reference voltage generator : 1.5 V

± 2%

• High speed operation is possible : Max 500 kHz

− 0.9 V

• Built-in soft start function

• Built-in timer/latch-actuated short-circuiting protection circuit

• Totem-pole type output with adjustable on/off current (for PNP transistors)

• Built-in standby function

• Small package : SSOP-16P (FPT-16P-M05)

s PACKAGE

16-pin Plastic SSOP

(FPT-16P-M05)