Datasheet > LTC1265-5_15

LTC1265-5_15

更新时间： 2022-02-26 11:51:49

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
16页	243K
描述
1.2A, High Efficiency Step-Down DC/DC Converter

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LTC1265-5_15 数据手册

LTC1265/LTC1265-3.3/LTC1265-5

1.2A, High Efficiency

Step-Down DC/DC Converter

FEATURES

DESCRIPTIO

The LTC^®1265 is a monolithic step-down current mode

DC/DC converter featuring Burst Mode ^TMoperation at low

output current. The LTC1265 incorporates a 0.3Ω switch

(V_IN=10V) allowing up to 1.2A of output current.

■

High Efficiency: Up to 95%

■

Current Mode Operation for Excellent Line and Load

Transient Response

■

Internal 0.3

Ω Power Switch (V_IN= 10V)

■

Short-Circuit Protection

Under no load condition, the converter draws only 160µA.

In shutdown it typically draws a mere 5µA making this

converter ideal for current sensitive applications. In drop-

out the internal P-channel MOSFET switch is turned on

continuouslymaximizingthelifeofthebatterysource.The

LTC1265incorporatesautomaticpowersavingBurstMode

operation to reduce gate charge losses when the load

currents drop below the level required for continuous

operation.

Low Dropout Operation: 100% Duty Cycle

Low-Battery Detector

Low 160µA Standby Current at Light Loads

Active-High Micropower Shutdown: I_Q< 15µA

Peak Inductor Current Independent of Inductor Value

^{Available in 14-p}U^{in SO Package}

APPLICATIO S

■

5V to 3.3V Conversion

Theinductorcurrentisuser-programmableviaanexternal

current sense resistor. Operation up to 700kHz permits

the use of small surface mount inductors and capacitors.

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

Burst Mode is a trademark of Linear Technology Corporation.

■

Distributed Power Systems

■

Step-Down Converters

■

Inverting Converters

■

Memory Backup Supply

■

Portable Instruments

■

Battery-Powered Equipment

■

Cellular Telephones

TYPICAL APPLICATIO

5.4V TO

12V

LTC1265-5 Efficiency

†††

100

68µF

20V

0.1µF

L1*

SENSE

PWR V

SHDN

33µH

0.1Ω

OUT

= 6V

= 9V

D1^†

LTC1265-5

††

OUT

220µF

PGND

= 12V

10V

3900pF

SENSE

130pF

1000pF

L = 33µH

V = 5V

OUT

–

SENSE

= 0.1Ω

* COILTRONICS CTX33-4

SENSE

SGND

= 130pF

** IRC LRC2010-01-R100-J

†

MBRS130LT3

^††AVX TPSE227K010

^†††AVX TPSE686K020

0.01

0.10

LOAD CURRENT (A)

1.00

LTC1265-FO1

LTC1265 TA01

Figure 1. High Efficiency Step-Down Converter

12 3 4 5 6 7...16

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