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ROHM Semiconductor |
Datasheet
Single-chip Type with Built-in FET Switching Regulators
Flexible Step-down
Switching Regulators
with Built-in Power MOSFET
BD9876AEFJ
●General Description
Output 3.0A and belo w High Efficiency Rate Step-down
Switching Re gulator Po wer MOSF ET Internal Type
BD9876AEFJ mainl y used as second ary s ide Po wer
supply, for example from fixed Power supply of 12V, 24V
etc, Step-down Output of 1.2V/1.8V/3.3V/5V, etc, can be
produced. T his IC h as e xternal C oil/Capacitor
down-sizing throu gh 30 0kHz F requency operation,
inside Nch-F ET SW for 45V “ withstand-pressure”
commutation and als o, hig h speed l oad respons e
through Curr ent Mode Control is a s imple e xternal
setting ph ase compensati on sy stem, through a wide
range e xternal const ant, a c ompact Po wer suppl y c an
be produced easily.
●Features
■ Internal 200 mΩ Nch MOSFET
■ Output Current 3A
■ Oscillation Frequency 3 00kHz
■ Synchronizes to External Clock ( 200kHz~
500kHz )
■ Feedback Voltage 1.0V±1.0%
■ Internal Soft Start Function
■ Internal Over Current Protect Circuit,
Low Input Error Prevention Circuit,
Heat Protect Circuit
■ ON/OFF Control through EN Pin
(Standby Current 0 A Typ.)
■ Package: HTSOP-J8 Package
●Typical Application Circuits
●Key Specifications
■ Input Voltage
■ Ref. Precision (Ta=25℃)
■ Max Output Current
■ Operating Temperature
■ Max Junction Temperature
7V to 42V
±1.0%
3A (Max.)
-40℃ to 105 ℃
-55℃ to 150 ℃
●Packages
HTSOP-J8
4.90mm x 6.00mm x 1.00mm
HTSOP-J8
●Applications
■ For Household machines in general that have
12V/24V Lines, etc.
Figure 1. Typical Application Circuit
○Structure:Silicon Monolithic Integrated Circuit ○ This product is not designed for normal operation with in a radioactive.
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© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
1/23
TSZ02201-0Q1Q0AJ00170-1-2
http://www.Datasheet4U.com
14.MAR.2014 Rev.005
BD9876AEFJ
●Pin Configuration
8765
Thermal Pad
Datasheet
1234
Figure 2. Pin Configuration (TOP VIEW)
●Pin Description
Pin No.
1
2
3
4
5
6
7
8
-
Pin Name Description
Lx Terminal for inductor
GND
Ground pin
VC Error amplifier output
FB Inverting node of the trans conductance error amplifier
SYNC Input pin of an external signal for the device synchronized by external signal
EN Stand-by ON/OFF pin
BST Voltage Supply pin for High Side FET Driver
VCC
Voltage input pin
Thermal Pad PAD for enhance the radiation of heat. Connect to GND absolutely.
●Block Diagram
ON/OF
E
TSD UVLO
Reference
VREF
REG
Current
Sense AMP
Shutdown
F Error
-
1.0V
+
+
Current
Comparator
-
Σ+
RQ
S
Soft
Start
Oscillator
300kH
VC
BS
200mΩ
LX
10Ω
GN
VOU
T
V SYN
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
Figure 3. Block Diagram
2/23
TSZ02201-0Q1Q0AJ00170-1-2
14.MAR.2014 Rev.005
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