LTC1522CS8 datasheet(1/8 Pages) LINER

部件名	LTC1522CS8

功能描述	Micropower, Regulated 5V Charge Pump DC/DC Converter

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制造商	LINER [Linear Technology]

网页	http://www.linear.com

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1

LTC1522

Micropower, Regulated

5V Charge Pump

DC/DC Converter

The LTC

®1522 is a micropower charge pump DC/DC

converter that produces a regulated 5V output from a 2.7V

to 5V input supply. Extremely low supply current (6

µA

typical with no load, < 1

µA in shutdown) and low external

parts count (one 0.22

µF flying capacitor and two 10µF

capacitors at VIN and VOUT) make the LTC1522 ideally

suited for small, light load battery-powered applications.

Typical efficiency (VIN = 3V) exceeds 75% with load

currents between 50

µA and 20mA. Modulating the SHDN

pin keeps the typical efficiency above 75% with load

currents all the way down to 10

µA.

The LTC1522 has thermal shutdown and can survive a

continuous short from VOUT to GND. In shutdown the

load is disconnected from VIN. The part is available in

8-pin MSOP and SO packages. The LTC1522 is pin

compatible with the LTC1516 in applications where

VIN ≥ 2.7V and IOUT ≤ 20mA.

s

Ultralow Power: Typical Operating ICC = 6µA

s

Short-Circuit/Thermal Protected

s

Regulated 5V

±4% Output Voltage

s

2.7V to 5V Input Range

s

No Inductors

s

Very Low ICC in Shutdown: <1µA

s

Output Current: 10mA (VIN ≥ 2.7V)

20mA (VIN ≥ 3V)

s

Shutdown Disconnects Load from VIN

s

Internal Oscillator: 700kHz

s

Compact Application Circuit (< 0.1 in2)

s

8-Pin MSOP and SO Packages

FEATURES

DESCRIPTION

APPLICATIONS

s

SIM Interface Supplies for GSM Cellular Telephones

s

Li-Ion Battery Backup Supplies

s

Local 3V to 5V Conversion

s

Smart Card Readers

s

PCMCIA Local 5V Supplies

TYPICAL APPLICATION

1

2

3

4

8

7

6

5

NC

SHDN

GND

C–

NC

VIN

VOUT

C+

LTC1522

ON/OFF

10

µF

10

µF

VOUT = 5V ±4%

IOUT = 0mA TO 10mA, VIN ≥ 2.7V

IOUT = 0mA TO 20mA, VIN ≥ 3V

0.22

µF

VIN

2.7V TO 5V +

+

1522 TA01

Regulated 5V Output from a 2.7V to 5V Input

Efficiency vs Output Current

OUTPUT CURRENT (mA)

50

60

70

80

90

100

1522 TA02

0.01

0.1

1

10

SHDN = 0V

VIN = 3V

LOW IQ MODE

(SEE FIGURE 2)

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

类似零件编号 - LTC1522CS8

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