© Semiconductor Components Industries, LLC, 2004

February, 2004 − Rev. 4

1

Publication Order Number:

NCP1500/D

NCP1500

Dual Mode PWM/Linear

BUCK Converter

The NCP1500 is a dual mode converter that operates as either a

pulse width modulated (PWM) buck converter or as a linear regulator.

The converter automatically transitions between the two modes. The

converter operates as a PWM when a synchronization signal is present

at the sync input. The converter operates as a linear regulator in the

absence of a synchronization signal. The PWM mode offers excellent

performance at normal to heavy loads at the sacrifice of output ripple

voltage. The linear mode offers excellent noise rejection at the

sacrifice of system efficiency. The user is able to select which mode

will give the best performance for a given operating condition.

Internal protection features include thermal shutdown with hysteresis

and cycle−by−cycle current limit in the PWM mode. Additionally, the

converter transitions into PFM mode at very light loads if a

synchronization signal is present and an output overvoltage condition

is detected.

PWM Features

Linear Regulator Features

Overall Features

1.0, 1.3, 1.5, and 1.8

Typical Applications

Figure 1. Typical Operating Circuit

MBRM120

L

L = 15

mH

8

7

6

5

1

2

3

4

SHD

SYN

LX

CB0

CB1

GND

8

7

6

5

1

2

3

4

Micro8

t

(MSOP−8)

DM SUFFIX

CASE 846A

8

1

1

8

A = Assembly Location

Y = Year

W = Work Week

MARKING

DIAGRAM

PIN CONNECTIONS

SHD

SYN

LX

CB0

CB1

GND

Device

Package

ORDERING INFORMATION

NCP1500DMR2

Micro8

4000 Tape/Reel

(Top View)

1500

AYW

http://onsemi.com

NCP1500DMR2G

Micro8

(Pb−Free)

4000 Tape/Reel

†For information on tape and reel specifications,

including part orientation and tape sizes, please

refer to our Tape and Reel Packaging Specifications

Brochure, BRD8011/D.