LT1956IGN datasheet(1/28 Pages) LINER

部品番号	LT1956IGN

部品情報	High Voltage, 1.5A, 500kHz Step-Down

PDF	28 Pages

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メーカー	LINER [Linear Technology]

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LT1956/LT1956-5

1956f

High Voltage, 1.5A,

500kHz Step-Down

Switching Regulators

s

Wide Input Range: 5.5V to 60V

s

1.5A Peak Switch Current

s

Small 16-Pin SSOP or Thermally Enhanced

TSSOP Package

s

Saturating Switch Design: 0.2

Ω

s

Peak Switch Current Maintained Over

Full Duty Cycle Range

s

Constant 500kHz Switching Frequency

s

Effective Supply Current: 2.5mA

s

Shutdown Current: 25

µA

s

1.2V Feedback Reference (LT1956)

s

5V Fixed Output (LT1956-5)

s

Easily Synchronizable

s

Cycle-by-Cycle Current Limiting

The LT

®1956/LT1956-5 are 500kHz monolithic buck

switching regulators with an input voltage capability up to

60V. A high efficiency 1.5A, 0.2

Ω switch is included on the

die along with all the necessary oscillator, control and logic

circuitry. A current mode architecture provides fast tran-

sient response and good loop stability.

Special design techniques and a new high voltage process

achieve high efficiency over a wide input range. Efficiency

is maintained over a wide output current range by using the

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*. A shutdown pin reduces supply current to 25

µAand

the device can be externally synchronized from 580kHz to

700kHz with a logic level input.

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

SSOP and thermally enhanced TSSOP packages.

s

High Voltage, Industrial and Automotive

s

Portable Computers

s

Battery-Powered Systems

s

Battery Chargers

s

Distributed Power Systems

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

5V Buck Converter

Efficiency vs Load Current

BOOST

VIN

6

2

10

12

10MQ060N

VOUT

5V

1A

4

15

14

11

220pF

4700pF

†UNITED CHEMI-CON THCS50EZA225ZT

1, 8, 9, 16

LT1956-5

SHDN

SYNC

SW

BIAS

FB

VC

GND

0.1

µF

22

µF

6.3V

CERAMIC

10

µH

MMSD914TI

1956 TA01

2.2

µF†

100V

CERAMIC

VIN

12V

(TRANSIENTS

TO 60V)

4.7k

LOAD CURRENT (A)

0

80

90

100

1.00

1956 TA02

70

60

50

0.25

0.50

0.75

1.25

VOUT = 5V

VOUT = 3.3V

VIN = 12V

L = 18

µH

DESCRIPTIO

FEATURES

APPLICATIO S

TYPICAL APPLICATIO

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

同様の部品番号 - LT1956IGN

メーカー	部品番号	データシート	部品情報
Linear Technology	LT1956IGN	288Kb / 28P	High Voltage, 1.5A, 500kHz Step-Down
Linear Technology	LT1956IGN-5	288Kb / 28P	High Voltage, 1.5A, 500kHz Step-Down

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同様の説明 - LT1956IGN

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