LTC1266CSPBF Linear Technology Corporation, LTC1266CSPBF Datasheet

LTC1266CSPBF

Manufacturer Part Number

LTC1266CSPBF

Description

SOP16

Manufacturer

Linear Technology Corporation

Datasheets

1.LTC1266CSPBF.pdf (20 pages)

2.LTC1266CSPBF.pdf (20 pages)

Specifications of LTC1266CSPBF

Date_code

09+

Current page: 1 of 20
Download datasheet (251Kb)

FEATURES

TYPICAL APPLICATIO

APPLICATIO S

Ultrahigh Efficiency: Over 95% Possible

Drives N-Channel MOSFET for High Current or

P-Channel MOSFET for Low Dropout

Pin Selectable Burst Mode Operation

1% Output Accuracy (LTC1266A)

Pin Selectable Phase of Topside Driver for Boost

or Step-Down Operation

Wide V

On-Chip Low-Battery Detector

High Efficiency Maintained Over Large Current Range

Low 170 A Standby Current at Light Loads

Current Mode Operation for Excellent Line and Load

Transient Response

Logic Controlled Micropower Shutdown: I

Short-Circuit Protection

Synchronous Switching with Nonoverlaping Gate Drives

Available in 16-Pin Narrow SO Package

Notebook and Palmtop Computers

Portable Instruments

Cellular Telephones

DC Power Distribution Systems

GPS Systems

4V TO 9V

>1.5V = SHUTDOWN

*TOKO 919AS-4R7M

470

3300pF

0V = NORMAL

LOW BAT IN

Range: 3.5V to 20V

100 F

180pF

Figure 1. High Efficiency Step-Down Converter

PINV

SHDN

BINH

SGND

LTC1266-3.3

PWR V

SENSE

TDRIVE

BDRIVE

PGND

OUT

–

1000pF

N-CHANNEL

Si9410

N-CHANNEL

Si9410

MBR0530T1

< 40 A

1266 TA01

0.1 F

MBRS130LT3

5 H

DESCRIPTIO

The LTC

regulator controllers featuring automatic Burst Mode

operation to maintain high efficiencies at low output

currents. These devices drive external power MOSFETs at

switching frequencies up to 400kHz using a constant off-

time current mode architecture providing constant ripple

current in the inductor. They can drive either an N-channel

or a P-channel topside MOSFET.

The operating current level is user-programmable via an

external current sense resistor. Wide input supply range

allows operation from 3.5V to 18V (20V maximum).

Constant off-time architecture provides low dropout regu-

lation limited only by the R

(when using the P-channel) and the resistance of the

inductor and current sense resistor.

The LTC1266 series combines synchronous switching for

maximum efficiency at high currents with an automatic

low current operating mode, called Burst Mode operation,

which reduces switching losses. Standby power is re-

duced to only 1mW at V

in Burst Mode operation are typically 0mA to 500mA.

Burst Mode is a trademark of Linear Technology Corporation.

0.02

LOW BAT OUT

100k

SENSE

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

330 F

N- or P-Channel MOSFETs

3.3V

OUT

1266 series is a family of synchronous switching

Synchronous Regulator

LTC1266-3.3/LTC1266-5

100

0.01

= 5V (at I

DS(ON)

LTC1266-3.3 Efficiency

= 5V

Controller for

LOAD CURRENT (A)

of the topside MOSFET

OUT

0.1

= 0). Load currents

LTC1266

1266 TA02

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