 Semiconductor Components Industries, LLC, 2002

September, 2002 – Rev. 11

1

Publication Order Number:

CS51411/D

CS51411, CS51412,

CS51413, CS51414

1.5 A, 260 kHz and

520 kHz, Low Voltage Buck

Regulators with External

Bias or Synchronization

Capability

The CS5141X products are 1.5 A buck regulator ICs. These devices

are fixed–frequency operating at 260 kHz and 520 kHz. The regulators

 control architecture to provide unmatched transient

response, the best overall regulation and the simplest loop

compensation for today’s high–speed logic. These products

accommodate input voltages from 4.5 V to 40 V.

The CS51411 and CS51413 contain synchronization circuitry. The

CS51412 and CS51414 have the option of powering the controller

from an external 3.3 V to 6.0 V supply in order to improve efficiency,

especially in high input voltage, light load conditions.

The on–chip NPN transistor is capable of providing a minimum of

1.5 A of output current, and is biased by an external “boost” capacitor

to ensure saturation, thus minimizing on–chip power dissipation.

Protection circuitry includes thermal shutdown, cycle–by–cycle

current limiting and frequency foldback. The CS51411 and CS51413

are functionally pin–compatible with the LT1375. The CS51412 and

CS51414 are functionally pin–compatible with the LT1376.

Features

Regulation and Simplified Design

Reduces Short Circuit Power Dissipation

Efficiency

X

= 1, 2, 3 or 4

A

= Assembly Location

WL, L

= Wafer Lot

YY, Y

= Year

WW, W

= Work Week

T

= Temperature Range, E or G

SO–8

D SUFFIX

CASE 751

1

8

MARKING DIAGRAM

1

5141X

ALYWT

8

SYNC

SHDNB

18

GND

BOOST

PIN CONNECTIONS

SHDNB

BIAS

18

GND

BOOST

CS51412/4

CS51411/3

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 14 of this data sheet.

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