© Semiconductor Components Industries, LLC, 2006

July, 2006 − Rev. 8

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Publication Order Number:

NCP1550/D

NCP1550

600 kHz PWM/PFM

Step−Down DC−DC

Controller

The NCP1550 is a monolithic micropower high frequency voltage

mode step−down controller IC, specially designed for battery operated

hand−held electronic products. With appropriate external P−type

MOSFET, the device can provide up to 2.0 A loading current with high

conversion efficiency. The device operates in Constant−Frequency

PWM mode at normal operation, that ensures low output ripple noise,

and which will automatically switch to PFM mode at low output loads

for higher efficiency. Additionally, value−added features of Chip

Enable to reduce IC Off−State current and integrated feedback resistor

network, make it the best choice for portable applications. The device is

designed to operate for voltage regulation with minimum external

components and board space. This device is available in a TSOP−5

package with six standard output voltage options.

Features

(Typical at PFM Mode with No Load)

with High Accuracy

$2.0%

Typical Applications

3.3 V/1.8 V

TSOP−5

SN SUFFIX

CASE 483

MARKING DIAGRAM

xxx = Specific Device Code

A

= Assembly Location

Y

= Year

W

= Work Week

G

= Pb−Free Package

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5

xxx AYW

G

G

PIN CONNECTIONS

CE

GND

EXT

(Top View)

See detailed ordering and shipping information in the package

dimensions section on page 16 of this data sheet.

ORDERING INFORMATION

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http://onsemi.com

(Note: Microdot may be in either location)

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