uP9303

1

uP9303-DS-F0101, Aug. 2017

www.upi-semi.com

5V/12V Synchronous-Rectified Buck Controller

The uP9303 is a compact synchronous-rectified buck

controller specifically designed to operate with single 12V

supply voltage and to deliver high quality output voltage. It

adopts external compensated, voltage mode control to

tightly regulate the feedback votlage to internal 0.6V

reference voltage. The switching frequency is programmable

from 50kHz to 500kHz, providing an optimal level of

integration to reduce size and cost of the power supply.

The uP9303 integrates MOSFET drivers that support

12V+12V bootstrapped voltage for high efficiency power

conversion.

The uP9303B features clock output that enables

synchronized operation of two buck converters, reducing

stress at input capacitors and EMI interference between

converters.

Other features include under voltage lockout (UVLO), under-

voltage protection, over-voltage protection and user

programmable

over-current

protection.

With

aforementioned functions, this part provides customers a

compact, high efficiency, well-protected and cost-effective

solutions. This part is available in SOP-14L package.

Operate with Single 12V Supply Voltage

0.6V V

Up to 30A High Output Current

Lossless, Programmable Overcurrent Protection

Uses Upper MOSFET R

DS(ON)

Adjustable Soft Start

Support Synchronized Operation

Clock Output (uP9303B)

Simple Voltage-Mode PWM Control Design

Adjustable Switching Frequency

External Compensation

Fast Transient Response

Minimum off time 300ns

Adaptive Shoot-Through Protection

Over/Under Voltage Protection

RoHS Compliant and Halogen Free

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General Description

Ordering Information

Features

Cable Modems, Set Top Boxes, and xDSL

Modems

ATX Power Supplies

Power Supplies for Microprocessors or

Subsystem Power Supplies

Industrial Power Supplies; General Purpose

Supplies

5V or 12V Input DC-DC Regulators

Low Voltage Distributed Power Supplies

Applications

Pin Configuration

RoHS compliant and 100% matte tin (Sn) plating that are

suitable for use in SnPb or Pb-free soldering processes.

VCC

FSET/SYN

PVCC

LGATE

PGND

OCSET

SS

COMP

1

2

3

411

12

13

14

uP9303A

BOOT

UGATE

PHASE

FB

EN

GND

5

6

78

9

10

VCC

FSET/SYN

PVCC

LGATE

PGND

OCSET

SS

COMP

uP9303B

BOOT

UGATE

PHASE

FB

CLK

GND

1

2

3

411

12

13

14

5

6

78

9

10