ROHM BD8312HFN Data Manual
Summary
ROHM BD8312HFN single-chip step-down switching regulator datasheet (No.11027EDT04) documenting this 1.5MHz high-efficiency DC-DC converter with built-in synchronous rectification power MOSFETs in HSON8 (2.9mmx3mm) package. Produces fixed outputs of 1.2V/1.8V/3.3V/5V from 3.5V to 14V input, supporting 4-cell dry batteries, 2-cell/3-cell Li-ion, or fixed 5V/12V rails. Delivers 1.2A at 7.4V-to-3.3V conversion. Features built-in Pch/Nch FETs rated 15V/1.0A, on-chip phase compensation between error a
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Single-chip Type with Built-in FET Switching Regulators
Output 1.5A or Less High-efficiency Step-down Switching Regulator with Built-in Power MOSFET
BD8312HFN No.11027EDT04
●Description BD8312HFN produces step-down output including 1.2, 1.8, 3.3, or 5 V from 4 batteries, batteries such as Li2cell or Li3cell, etc. or a 5V/12V fixed power supply line. This IC allows easy production of small power supply by a wide range of external constants, and is equipped with an external coil/capacitor downsized by high frequency operation of 1.5 MHz, built-in synchronous rectification SW capable of withstanding 15 V, and flexible phase compensation system on board.
●Features 1) Incorporates Pch/Nch synchronous rectification SW capable of withstanding 1.0 A/15V. 2) Incorporates phase compensation device between input and output of Error AMP. 3) Small coils and capacitors to be used by high frequency operation of 1.5MHz 4) Input voltage 3.5 V – 14 V Output current 1.2A(7.4V input, 3.3V output) 0.8A(4.5V input, 3.3V output) 5) Incorporates soft-start function. 6) Incorporates timer latch system short protecting function. 7) As small as 2.9mm×3 mm, SON 8-pin package HSON8
●Application For portable equipment like DSC/DVC powered by 4 dry batteries or Li2cell and Li3cell, or general consumer-equipment with 5 V/12 V lines
●Operating Conditions (Ta = 25℃)
Parameter Symbol Voltage circuit Unit
Power supply voltage VCC 3.5 to 14 V Output voltage VOUT 1.2 to 12 V
●Absolute Maximum Ratings
Parameter Symbol Rating Unit
Maximum applied power voltage VCC, PVCC 15 V Maximum input current Iinmax 1.0 A Power dissipation Pd 630 m W Operating temperature range Topr -25 to +85 ℃ Storage temperature range Tstg -55 to +150 ℃ Junction temperature Tjmax +150 ℃ *1 When used at Ta = 25℃ or more installed on a 70×70×1.6tmm board, the rating is reduced by 5.04m W/℃. * These specifications are subject to change without advance notice for modifications and other reasons.
www.rohm.com 2011.04 - Rev.D
© 2011 ROHM Co., Ltd. All rights reserved.
Page Summary Contents For ROHM BD8312HFN Data Manual
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 15 |
| File Size | 430.16 KB |
| Published | June 21, 2026 |
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Frequently Asked Questions
What are the input voltage limits for this regulator?
The power supply voltage (VCC) ranges from 3.5 V to 14 V.
How does the BD8312HFN protect against system failures?
It includes a timer latch system for short protecting, and operates with soft-start and Unique Voltage Low (UVLO) detection thresholds.
What kind of external batteries can power this IC?
It supports various batteries such as Li2cell or Li3cell, in addition to 5V/12V fixed power lines.