BD8312HFN_11 Datasheet, PDF (1/15 Pages) Rohm – Output 1.5A or Less High-efficiency Step-down Switching Regulator with Built-in Power MOSFET

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
Power supply voltage
Output voltage
Symbol
VCC
VOUT
Voltage circuit
Unit
3.5 to 14
V
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
mW
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 70×70×1.6^tmm board, the rating is reduced by 5.04mW/℃.
* These specifications are subject to change without advance notice for modifications and other reasons.
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2011.04 - Rev.D