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Single-chip Type with built-in FET Switching Regulator Series

Flexible Step-down

Switching Regulators

with Built-in Power MOSFET

BD9778F, BD9778HFP, BD9001F, BD9781HFP

2010.02 -

Rev. B

www.rohm.com

© 2010 ROHM Co., Ltd. All rights reserved.

No.10027EBT41

Overview

Features

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Minimal external components

Wide input voltage range: 7 V to 35 V (BD9778F/HFP and BD9781HFP), 7 V to 48 V (BD9001F)

Built-in P-ch POWER MOS FET

Reference voltage accuracy: ±2%

Wide operating temperature range: -40˚C to +125˚C (BD9778F/HFP and BD9781HFP),

-40˚C to +95˚C (BD9001F)

Low dropout: 100% ON Duty cycle

Standby mode supply current: 0 µA (Typ.) (BD9778F/HFP and BD9781HFP), 4 µA (Typ.) (BD9001F)

Oscillation frequency variable with external resistor: 50 to 300 kHz (BD9001F),

50 to 500 kHz (BD9778F/HFP and BD9781HFP)

External synchronization enabled (only on the BD9781HFP)

Soft start function : soft start time fixed to 5 ms (Typ.))

Built-in overcurrent protection circuit

Built-in thermal shutdown protection circuit

High power HRP7 package mounted (BD9778HFP and BD9781HFP)

Compact SOP8 package mounted (BD9778F and BD9001F)

All fields of industrial equipment, such as Flat TV , printer, DVD, car audio, car navigation,

and communication such as ETC, AV, and OA.

Applications

Product lineup

The flexible step-down switching regulator controller is a switching regulator controller designed with a high-withstand-voltage

built-in POWER MOS FET, providing a free setting function of operating frequency with external resistor. This switching regulator

controller features a wide input voltage range (7 V to 35 V or 7 V to 48 V) and operating temperature range (-40˚C to +125˚C or

-40˚C to +95˚C). Furthermore, an external synchronization input pin (BD9781HFP) enables synchronous operation with external

clock.

BD9778F/HFP

2A

7V ~ 35V

50 ~ 500kHz

Not provided

Provided

-40˚C ~ +125˚C

SOP8 / HRP7

Output current

Input range

Oscillation frequency range

External synchronization

Standby function

Operating temperature

Package

BD9001F

2A

7V ~ 48V

50 ~ 300kHz

Not provided

Provided

-40˚C ~ +95˚C

SOP8

BD9781HFP

4A

7V ~ 35V

50 ~ 500kHz

Provided

Provided

-40˚C ~ +125˚C

HRP7

Item