LT1616 데이터 시트보기 (PDF) - Linear Technology

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LT1616

600mA, 1.4MHz Step-Down Switching Regulator in SOT-23

Linear Technology 

FEATURES

s Wide Input Range: 3.6V to 25V

s 5V at 400mA from 7V to 25V Input

s 3.3V at 400mA from 4.7V to 25V Input

s Fixed Frequency 1.4MHz Operation

s Uses Tiny Capacitors and Inductors

s Internally Compensated

s Low Shutdown Current: <1µA

s Low VCESAT Switch: 220mV at 300mA

s Tiny 6-Lead SOT-23 Package

U

APPLICATIO S

s Wall Transformer Regulation

s Local Logic Supply Conversion:

12V to 5V

12V or 5V to 3.3V, 2.5V or 1.8V

s Distributed Supply Regulation

s Digital Cameras

s Battery-Powered Equipment

LT1616

600mA, 1.4MHz Step-Down

Switching Regulator

in SOT-23

DESCRIPTIO

The LT®1616 is a current mode PWM step-down DC/DC

converter with internal 0.6A power switch, packaged in a

tiny 6-lead SOT-23. The wide input range of 3.6V to 25V

makes the LT1616 suitable for regulating a wide variety of

power sources, from 4-cell batteries and 5V logic rails to

unregulated wall transformers and lead-acid batteries. Its

high operating frequency allows the use of tiny, low cost

inductors and ceramic capacitors. With its internal com-

pensation eliminating additional components, a complete

400mA step-down regulator fits onto 0.15 square inches

of PC board area.

The constant frequency current mode PWM architecture

and stable operation with ceramic capacitors results in

low, predictable output ripple. Current limiting provides

protection against shorted outputs. The low current (<1µA)

shutdown provides complete output disconnect, enabling

easy power management in battery-powered systems.

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

TYPICAL APPLICATIO

3.3V Step-Down Converter

VIN

4.5V TO 25V

OFF ON

5

VIN

1

BOOST

LT1616

4

SHDN

6

SW

GND

FB R1

2

3 16.5k

C1

R2

1µF

10k

D2

C3

L1

0.01µF 10µH

D1

C1: TAIYO-YUDEN TMK316BJ105

C2: TAIYO-YUDEN JMK316BJ106ML

D1: ON SEMICONDUCTOR MBR0530

D2: 1N4148

L1: SUMIDA CR43-100

VOUT

3.3V

300mA: VIN = 4.5V TO 25V

400mA: VIN = 4.7V TO 25V

C2

10µF

1616 TA01

100

90

80

70

60

50

40

30

0

Efficiency

VIN = 5V VIN = 12V

VIN = 20V

100 200 300 400 500

LOAD CURRENT (mA)

1616 G02

1

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