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2009.05 - Rev.A

© 2009 ROHM Co., Ltd. All rights reserved.

Large Current External FET Controller Type Switching Regulators

Single/Dual-output High-frequency

Step-downSwitchingRegulator(Controllertype)

BD9853AFV

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Description

The BD9853AFV is a 2-ch synchronous DC/DC controller that can operate at a maximum switching frequency of 2MHz,

enabling the use of a smaller external coil than conventional lower-frequency switching regulators. This makes the

BD9853AFV a suitable choice for downsizing applications.

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Features

1) Synchronous Switching Regulator Controller 2channels

2) FET(Pch/Nch) Direct Drive

3) Adjustable Oscillator Frequency with External Resistor (Max. 2MHz)

4) Under Voltage Lockout Function (UVLO)

5) Thermal Shut Down Function (TSD)

6) Short Circuit Protection (SCP)

7) Independent ON/OFF Function in Each Channel with Soft Start Pin

8) SSOP-B16 Package

SSOPB16

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Applications

TVSTB, PC, Portable CD・DVD,DVC etc.

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Absolute Maximum Ratings (Ta = 25℃)

Parameter

Symbol

Limits

Unit

Supply Voltage (VCC-GND)

Vcc

18

V

VREGA-GND Voltage

VREGA

7

V

VCC-VREGB Voltage

VREGB

7

V

Power Dissipation

Pd

562(*1)

mW

Operating Temperature Range

Topr

-40 to +85

℃

Junction Temperature

Tjmax

+150

℃

Storage Temperature Range

Tstg

-55 to +150

℃

*

Reduced by 4.49mW for each increase in Ta of 1℃ over 25℃ (When mounted on a board 70×70×1.6tmm grass-epoxy PCB)

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Recommended Operating Conditions

Parameter

Symbol

Limits

Unit

Min.

Typ.

Max.

Supply Voltage

Vcc

4.5

12

16

V

Oscillator Frequency

fosc

100

1000

2000

KHz

No.09028EAT05