NCP5425DBR2G datasheet(1/22 Pages) ONSEMI

Part #	NCP5425DBR2G

Description	Dual Synchronous Buck Controller

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Manufacturer	ONSEMI [ON Semiconductor]

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July, 2006 − Rev. 9

1

Publication Order Number:

NCP5425/D

NCP5425

Dual Synchronous

Buck Controller

The NCP5425 is a highly flexible dual buck controller with internal

gate drivers that can be used with two input power supplies and one or

two outputs in multiple configurations. The part contains all the

circuitry required for two independent synchronous dual NFET buck

regulators utilizing a feed forward voltage mode control method. The

NCP5425 can run from a single supply ranging from 4.6 to 12 V and

support a single two phase or dual single phase outputs. When used as

a dual output controller, the second output tracks voltage transients

from the first. Power blanking for low noise applications is supported

as well as independent cycle−by−cycle current limiting. The part is

available in a 20 pin TSSOP package allowing the designer to

minimize PCB area.

Features

• Operation Over 4.6 to 13.2 V

• Dual Synchronous Buck Design

• Configurable as a Single Two Phase Output or Two Single Phase

Outputs

• Programmable Power Sharing and Budgeting from Two Independent

Supplies

• 0.8 V "1% Reference for Low Voltage Outputs

• 1.5 A Peak Power Drive

• Switch Blanking for Noise Sensitive Applications through use of

ROSC Pin

• Programmable Frequency, 150 kHz to 750 kHz Operation

• Programmable Soft−Start

• Cycle−by−Cycle Overcurrent Protection

• Independent Programmable Current Limits

• 100% Duty Cycle for Fast Transient Response

• Internal Slope Compensation

• Out−of−Phase Synchronization between the Controllers

• Input Undervoltage Lockout

• On/Off Enable through use of the COMP Pins

• Power Supply Sequencing

• These are Pb−Free Devices

Applications

• DDR Memory Power

• Graphics Cards

NCP5425DBR2

A = Assembly Location

L

= Wafer Lot

Y = Year

W = Work Week

G = Pb−Free Package

Device

Package

Shipping†

ORDERING INFORMATION

NCP5425DB

TSSOP−20*

75 Units/Tube

2500/Tape & Reel

PIN CONNECTIONS AND

MARKING DIAGRAM

TSSOP−20

DB SUFFIX

CASE 948E

1

20

1

20

GATEH1

GATEL1

GND

BST

NC

IS+1

IS−1

VFB1

COMP1

GATEH2

GATEL2

VCC

ROSC

MODE

IS−2

IS+2

VREF2

VFB2

COMP2

NCP

5425

ALYW

G

http://onsemi.com

†For information on tape and reel specifications,

including part orientation and tape sizes, please

refer to our Tape and Reel Packaging Specification

Brochure, BRD8011/D.

NCP5425DBR2G

2500/Tape & Reel

NCP5425DBG

TSSOP−20*

75 Units/Tube

TSSOP−20*

*This package is inherently Pb−Free.

(Note: Microdot may be in either location)

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