© Semiconductor Components Industries, LLC, 2004

November, 2004 − Rev. 3

1

Publication Order Number:

NCP1530/D

NCP1530

600 mA PWM/PFM

Step−Down Converter with

External Synchronization Pin

The NCP1530 is a PWM/PFM non−synchronous step−down

(Buck) DC−DC converter for usage in systems supplied from 1−cell

Li−ion, or 2 or more cells Alkaline/NiCd/NiMH batteries. It can

operate in Constant−Frequency PWM mode or PWM/PFM mode in

which the controller will automatically switch to PFM mode

operation at low output loads to maintain high efficiency. The

switching frequency can also be synchronized to external clock

between 600 kHz and 1.2 MHz. The maximum output current is up

to 600 mA. Applying an external synchronizing signal to SYN pin

can supersede the PFM operation.

The NCP1530 consumes only 47

mA (typ) of supply current

bringing the enable input (EN) low. In shutdown mode, the regulator

is disabled and the shutdown supply current is reduced to

0.5

mA (typ). Other features include built−in undervoltage lockout,

internal thermal shutdown, an externally programmable soft−start

time and output current limit protection. The NCP1530 operates

from a maximum input voltage of 5.0 V and is available in a space

saving, low profile Micro8

™ package.

Features

and Capacitor, Ceramic Capacitors Can be Used

Typical Applications

Micro8

]

DM SUFFIX

CASE 846A

1

8

PIN CONNECTIONS

http://onsemi.com

xxxx = Specific Device Code

A

= Assembly Location

L

= Wafer Lot

Y

= Year

W

= Work Week

MARKING

DIAGRAM

xxxx

ALYW

8

7

6

5

1

2

3

4

SYN

SS

GND

LX

EN

(Top View)

See detailed ordering and shipping information in the package

dimensions section on page 14 of this data sheet.

ORDERING INFORMATION