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1956

更新时间： 2024-11-26 12:53:55

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
28页	288K
描述
High Voltage, 1.5A, 500kHz Step-Down

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1956 数据手册

LT1956/LT1956-5

High Voltage, 1.5A,

500kHz Step-Down

Switching Regulators

FEATURES

DESCRIPTIO

The LT^®1956/LT1956-5 are 500kHz monolithic buck

switching regulators with an input voltage capability up to

60V. Ahighefficiency1.5A, 0.2Ωswitchisincludedonthe

diealongwithallthenecessaryoscillator,controlandlogic

circuitry. A current mode architecture provides fast tran-

sient response and good loop stability.

■

Wide Input Range: 5.5V to 60V

■

1.5A Peak Switch Current

■

Small 16-Pin SSOP or Thermally Enhanced

TSSOP Package

Saturating Switch Design: 0.2Ω

■

Peak Switch Current Maintained Over

Full Duty Cycle Range

Special design techniques and a new high voltage process

achieve high efficiency over a wide input range. Efficiency

ismaintainedoverawideoutputcurrentrangebyusingthe

output to bias the circuitry and by utilizing a supply boost

capacitor to saturate the power switch. Patented circuitry

maintains peak switch current over the full duty cycle

range*.Ashutdownpinreducessupplycurrentto25µAand

the device can be externally synchronized from 580kHz to

700kHz with a logic level input.

■

Constant 500kHz Switching Frequency

■

Effective Supply Current: 2.5mA

■

Shutdown Current: 25µA

■

1.2V Feedback Reference (LT1956)

■

5V Fixed Output (LT1956-5)

Easily Synchronizable

■

^{Cycle-by-Cycle C}U^{urrent Limiting}

APPLICATIO S

■

The LT1956/LT1956-5 are available in fused-lead 16-pin

SSOP and thermally enhanced TSSOP packages.

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

*U.S. PATENT NO. 6,498,466

High Voltage, Industrial and Automotive

■

Portable Computers

■

Battery-Powered Systems

■

Battery Chargers

■

Distributed Power Systems

TYPICAL APPLICATIO

5V Buck Converter

Efficiency vs Load Current

MMSD914TI

100

= 12V

L = 18µH

OUT

= 5V

0.1µF

BOOST

10µH

OUT

12V

(TRANSIENTS

TO 60V)

OUT

= 3.3V

2.2µF^†

100V

CERAMIC

10MQ060N

LT1956-5

22µF

6.3V

CERAMIC

SHDN

BIAS

SYNC

GND

1, 8, 9, 16 11

0.25

0.50

0.75

1.00

1.25

220pF

4.7k

LOAD CURRENT (A)

1956 TA02

4700pF

^†UNITED CHEMI-CON THCS50EZA225ZT

1956 TA01

1956f

12 3 4 5 6 7...28

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