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NCP1571

Low Voltage Synchronous

Buck Controller

The NCP1571 is a low voltage buck controller. It provides the

control for a DC鈥揇C power solution producing an output voltage as

low as 0.980 V over a wide current range. The NCP1571鈥揵ased

solution is powered from 12 V with the output derived from a 2鈥? V

supply. It contains all required circuitry for a synchronous NFET buck

regulator using the V

2

鈩?/div>

control method to achieve the fastest possible

transient response and best overall regulation. NCP1571 operates at a

fixed internal 200 kHz frequency and is packaged in an SO鈥?.

This device provides undervoltage lockout protection, Soft Start,

Power Good with delay, and built鈥搃n adaptive non鈥搊verlap. During

undervoltage lockout, the NCP1571 controller allows the power

supply output to drift down, allowing the load time to shut off. This

operation distinguishes the NCP1571 from other parts in its family.

Features

鈥?/div>

0.980 V

鹵

1.0% Reference Voltage

鈥?/div>

V

2

Control Topology

鈥?/div>

200 ns Transient Response

鈥?/div>

Programmable Soft Start

鈥?/div>

Power Good

鈥?/div>

Programmable Power Good Delay

鈥?/div>

40 ns Gate Rise and Fall Times (3.3 nF Load)

鈥?/div>

Adaptive FET Non鈥揙verlap Time

鈥?/div>

Fixed 200 kHz Oscillator Frequency

鈥?/div>

Undervoltage Lockout Holds Both Gate Outputs Low

鈥?/div>

On/Off Control Through Use of the COMP Pin

鈥?/div>

Overvoltage Protection through Synchronous MOSFETs

鈥?/div>

Synchronous N鈥揅hannel Buck Design

鈥?/div>

Dual Supply, 12 V Control, 2鈥? V Power Source

http://onsemi.com

8

1

SO鈥?

D SUFFIX

CASE 751

PIN CONNECTIONS AND

MARKING DIAGRAM

V

CC

PWRGD

PGDELAY

COMP

A

L

Y

W

1

1571

ALYW

8

GND

V

FB

GATE(L)

GATE(H)

= Assembly Location

= Wafer Lot

= Year

= Work Week

ORDERING INFORMATION

Device

NCP1571D

NCP1571DR2

Package

SO鈥?

Shipping

98 Units/Rail

2500 Tape & Reel

漏

Semiconductor Components Industries, LLC, 2002

1

March, 2002 鈥?Rev. 3

Publication Order Number

NCP1571/D

型號

版本

描述

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