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Rohm Semiconductor Electronic Components Datasheet

BD9D323QWZ Datasheet

3.0A Integrated MOSFET 1ch Synchronous Buck DC/DC Converter

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Datasheet
4.5V to 18V Input, 3.0A Integrated MOSFET
1ch Synchronous Buck DC/DC Converter
BD9D323QWZ
General Description
BD9D323QWZ is a synchronous buck switching regulator
with built-in low on-resistance power MOSFETs. It is
capable of providing current of up to 3 A. External phase
compensation circuit is not necessary for it is a constant
on-time control DC/DC converter with fast transient
response.
Features
Synchronous Single DC/DC Converter
Constant On-time Control
Over Current Protection
Thermal Shutdown Protection
Under Voltage Lockout Protection
Adjustable Soft Start
UMMP008Z2020 Package (Backside Heat
Dissipation)
Key Specifications
Input Voltage Range:
4.5V to 18.0 V
Output Voltage Setting Range:
0.765V to 7V
(VIN×0.07)V to (VIN×0.65)V
Output Current:
3A (Max)
Switching Frequency:
700kHz (Typ)
High Side MOSFET On-Resistance: 80m(Typ)
Low Side MOSFET On-Resistance: 50m(Typ)
Standby Current:
2μA (Typ)
Package
UMMP008Z2020
W(Typ) x D(Typ) x H(Max)
2.00mm x 2.00mm x 0.40mm
Applications
Step-down Power Supply for DSPs, FPGAs,
Microprocessors, etc.
Set-top Box
LCD TVs
DVD / Blu-ray Player / Recorder
POL Power Supply, etc.
UMMP008Z2020
Typical Application Circuit
Figure 1. Typical Application Circuit
Product structure: Silicon monolithic integrated circuit This product has no designed protection against radioactive rays.
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
1/36
TSZ02201-0F3F0AC00070-1-2
06.Feb.2017 Rev.003


Rohm Semiconductor Electronic Components Datasheet

BD9D323QWZ Datasheet

3.0A Integrated MOSFET 1ch Synchronous Buck DC/DC Converter

No Preview Available !

BD9D323QWZ
Pin Configuration
(TOP VIEW)
Datasheet
Figure 2. Pin Configuration
Pin Descriptions
Terminal
No.
Symbol
Function
1
VIN
Power supply terminal for the switching regulator.
Connecting 10µF and 0.1µF ceramic capacitors to ground is recommended.
2
BOOT
Connect a bootstrap capacitor of 0.1µF between this terminal and SW terminal.
The voltage of this capacitor is the gate drive voltage of the high-side MOSFET.
Switch node. This terminal is connected to the source of the high-side MOSFET and drain of
3
SW
the low-side MOSFET. Connect a bootstrap capacitor of 0.1µF between this terminal and
BOOT terminal. In addition, connect an inductor considering the direct current
superimposition characteristic.
4 GND Ground terminal for the output stage of the switching regulator and the control circuit.
5
SS
Terminal for setting the soft start time. The rise time of the output voltage can be specified by
connecting a capacitor to this terminal. Refer to page.28 for how to calculate the capacitance.
6
FB
An inverting input terminal of comparator which compares with reference voltage (VREF).
Refer to page.27 for how to calculate the resistance of the output voltage setting.
Power supply voltage terminal inside IC.
7 VREG Voltage of 5.25V (Typ) is outputted with more than 2.2V is impressed to EN terminal.
Connect 1µF ceramic capacitor to ground.
Turning this terminal signal low level (0.3 V or lower) forces the device to enter the shutdown
8 EN mode. Turning this terminal signal high level (2.2 V or higher) enables the device. This
terminal must be terminated.
-
E-PAD
A backside heat dissipation pad. Connecting to the internal PCB ground plane by using
multiple via provides excellent heat dissipation characteristics.
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
2/36
TSZ02201-0F3F0AC00070-1-2
06.Feb.2017 Rev.003


Part Number BD9D323QWZ
Description 3.0A Integrated MOSFET 1ch Synchronous Buck DC/DC Converter
Maker ROHM
Total Page 30 Pages
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