NCP1550D ON, NCP1550D Datasheet

NCP1550D

Manufacturer Part Number

NCP1550D

Description

600 kHz PWM/PFM Step-Down DC-DC Controller

Manufacturer

Datasheet

1.NCP1550D.pdf (18 pages)

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NCP1550

600 kHz PWM/PFM

Step−Down DC−DC

Controller

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 Applications

September, 2004 − Rev. 6

The NCP1550 is a monolithic micropower high frequency

No Load)

$2.0%

3.3 V/1.8 V

Pb−Free Packages are Available

High Efficiency 92%, Typical

Low Quiescent Bias Current of 50 mA (Typical at PFM Mode with

Output Voltage Options from 1.8 V to 3.3 V with High Accuracy

Low Output Voltage Ripple, 50 mV, Typical

PWM Switching Frequency at 600 kHz

Automatic PWM/PFM Switchover at Light Load Condition

Very Low Dropout Operation, 100% Max. Duty Cycle

Chip Enable Pin with On−Chip 150 nA Pullup Current Source

Low Shutdown Current, 0.3 mA, Typical

Input Voltage Range from 2.45 V to 5.5 V

Built−in Soft−Start

Internal Undervoltage Lockout (UVLO) Protection

Low Profile and Minimum External Components

Micro Miniature TSOP−5 Package

Personal Digital Assistant (PDA)

Camcorders and Digital Still Camera

Hand−Held Instrument

Distributed Power System

Computer Peripheral

Conversion from Four NiMH or NiCd or One Lithium−ion Cells to

Semiconductor Components Industries, LLC, 2004

See detailed ordering and shipping information in the package

dimensions section on page 16 of this data sheet.

GND

ORDERING INFORMATION

OUT

PIN CONNECTIONS

http://onsemi.com

xxx = Device Code

SN SUFFIX

CASE 483

TSOP−5

(Top View)

= Year

= Work Week

Publication Order Number:

MARKING

DIAGRAM

EXT

xxxYW

NCP1550/D

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