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2009.04 - Rev.B

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

Hi-performance Regulator IC Series for PCs

Nch FET Ultra LDOs

for Desktop PCs

BD3523HFN, BD35230HFN, BD35231HFN

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Description

The BD3523HFN, BD35230HFN, BD35231HFN ultra low-dropout linear chipset regulator operates from a very low input

supply, and offers ideal performance in low input voltage to low output voltage applications. It incorporates a built-in

lowering the dropout voltage in this way, the regulator realizes high current output (Iomax=2.0A) with reduced conversion

loss, and thereby obviates the switching regulator and its power transistor, choke coil, and rectifier diode. Thus, the

BD3523HFN, BD35230HFN, BD35231HFN designed to enable significant package profile downsizing and cost reduction. In

BD3523HFN, an external resistor allows the entire range of output voltage configurations between 0.65 and 2.7V, while the

NRCS (soft start) function enables a controlled output voltage ramp-up, which can be programmed to whatever power supply

sequence is required.

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Features

1) Internal high-precision reference voltage circuit(0.65V±1%)

2) Internal high-precision output voltage circuit <BD35230HFN/BD35231HFN>

3) Built-in VCC undervoltage lockout circuit (VCC=3.80V)

4) NRCS (soft start) function reduces the magnitude of in-rush current

5) Internal Nch MOSFET driver offers low ON resistance (100mΩ typ)

6) Built-in short circuit protection (SCP)

7) Built-in current limit circuit (2.0A min)

8) Built-in thermal shutdown (TSD) circuit

9) Variable output (0.65～2.7V) <BD3523HFN>

10) High-power package HSON8 : 2.9mm×3.0mm×0.6mm

11) Tracking function

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Applications

Notebook computers, Desktop computers, LCD-TV, DVD, Digital appliances

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Line-up

Maximum Output Voltage

Package

Product name

Adjustable (0.65～2.7V)

HSON8

BD3523HFN

1.0V (fixed)

BD35230HFN

1.2V (fixed)

BD35231HFN

No.09030EBT01