○

Product structure：Silicon monolithic integrated circuit ○ This product has no designed protection against radioactive rays

1/25

www.rohm.com

© 2012 ROHM Co., Ltd. All rights reserved.

TSZ22111･14･001

TSZ02201-0J3J0AJ00340-1-2

24.Oct.2013 Rev.003

4.0V(or 4.5V) to 5.5V, 0.8A 1ch

Synchronous Buck Converter Integrated FET

BD9102FVM BD9104FVM

General Description

The BD9102FVM and BD9104FVM are ROHM’s high

efficiency step-down switching regulator designed to

produce a voltage as low as 1.24V from a supply

voltage of 5V. Offers high efficiency with our original

pulse skip control technology and synchronous

rectifier. It offers high efficiency by using synchronous

switches and provides fast transient response to

sudden load changes by implementing current mode

control.

Features



Fast Transient Response Because of Current Mode

PWM Control System.



Highly Efficient for All Load Ranges Because of

(Simple Light Load Mode)



Soft-Start Function.



Thermal Protection and UVLO Functions.



Short-Circuit Protection with Time Delay Function.



Shutdown Function

Applications

Power supply for HDD, portable electronic devices like

PDA, and LSI including CPU and ASIC.

Key Specifications



Input Voltage Range

BD9102FVM:

4.0V to 5.5V

BD9104FVM:

4.5V to 5.5V



Output Voltage Range

BD9102FVM:

1.24V ± 2%

BD9104FVM:

3.30V ± 2%



Output Current:

0.8A(Max)



Switching Frequency:

1.0MHz(Typ)



Pch FET ON-Resistance:

350mΩ(Typ)



Nch FET ON-Resistance:

250mΩ(Typ)



Standby Current:

0μA(Typ)



Operating Temperature Range:

-25°C to +85°C

Package

W(Typ) x D(Typ) x H(Max)

Typical Application Circuit

Figure 1.

Typical Application Circuit

Lineup

Input Voltage Range Output Voltage Range

UVLO Threshold

Voltage

(Typ)

Package

Orderable

Part Number

4.0V to 5.5V

1.24V±2%

2.7V

MSOP8

Reel of 3000

BD9102FVM-TR

4.5V to 5.5V

3.30V±2%

4.1V

MSOP8

Reel of 3000

BD9104FVM-TR

MSOP8

2.90 mm x 4.00 mm x 0.90 mm