ltc1875egn-trpbf Linear Technology Corporation, ltc1875egn-trpbf Datasheet

ltc1875egn-trpbf

Manufacturer Part Number

ltc1875egn-trpbf

Description

15?a Quiescent Current 1.5a Monolithic Synchronous Step-down Regulator

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC1875EGN-TRPBF.pdf (20 pages)

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FEATURES

TYPICAL APPLICATIO

APPLICATIO S

High Efficiency: Up to 95%

Low Quiescent Current: Only 15 A with No Load

550kHz Constant Frequency Operation

2.65V to 6V Input Voltage Range

True PLL Frequency Locking from 350kHz to 750kHz

Power Good Output Voltage Monitor

Low Dropout Operation: 100% Duty Cycle

Burst Mode

Current Mode Operation for Excellent Line and Load

Transient Response

Shutdown Mode Draws < 1 A Supply Current

Overcurrent and Overtemperature Protected

Available in 16-Lead SSOP Package

Portable Computers

Portable Instruments

Wireless Modems

OUT

2% Output Voltage Accuracy

2.65V TO 6V

from 0.8V to V

L1: TOKO 646CY-6R8M

OUT

47pF

: TAIYO YUDEN CERAMIC JMK325BJ226MM

: SANYO POSCAP 6TPA47M

CONNECTED TO V

or Pulse Skipping Operation

22 F

150k

220pF

High Efficiency Step-Down Converter

, I

(MINUS SWITCH AND L1 VOLTAGE DROP) FOR 2.65V < V

OUT

RUN/SS

SYNC/MODE

PGOOD

to 1.5A

LTC1875

SGND

PGND

SWP

SWN

28.0k

1875 TA01

6.8 H

88.7k

1.5A Monolithic Synchronous

47 F

DESCRIPTIO

The LTC

chronous buck regulator using a constant frequency,

current mode architecture. Operating supply current is

only 15 A with no load and drops to < 1 A in shutdown.

The input supply voltage range of 2.65V to 6V makes the

LTC1875 ideally suited for single Li-Ion battery-powered

applications. 100% duty cycle provides low dropout op-

eration, extending battery life in portable systems.

The switching frequency is internally set to 550kHz, allow-

ing the use of small surface mount inductors and capaci-

tors. For noise sensitive applications, the LTC1875 can be

externally synchronized from 350kHz to 750kHz. Burst

Mode operation is inhibited during synchronization or

when the SYNC/MODE pin is pulled low.

The internal synchronous switch increases efficiency and

eliminates the need for an external Schottky diode. Low

output voltages are easily supported with a 0.8V feedback

reference voltage. The LTC1875 is available in a 16-lead

SSOP package.

Burst Mode is a registered trademark of Linear Technology Corporation.

OUT

3.3V

OUT

, LTC and LT are registered trademarks of Linear Technology Corporation.

< 3.3V

15 A Quiescent Current

1875 is a high efficiency 1.5A monolithic syn-

Step-Down Regulator

100

0.1

Efficiency vs Output Load Current

= 3.6V

OUPUT CURRENT (mA)

Burst Mode OPERATION

L = 6.8 H

OUT

= 6V

= 3.3V

= 4.2V

100

LTC1875

1875 TA01a

1000

1875f

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