1174 データシートの表示（PDF） - Linear Technology

部品番号

コンポーネント説明

メーカー

1174

High Efficiency Step-Down and Inverting DC/DC Converter

Linear Technology 

FEATURES

■ High Efficiency: Up to 94%

■ Peak Inductor Current Independent of

Inductor Value

■ Short-Circuit Protection

■ Optimized for 5V to – 5V Applications

■ Wide VIN Range: 4V to 18.5V

■ Low Dropout Operation

■ Low-Battery Detector

■ Pin Selectable Current Limit

■ Internal 0.9Ω Power Switch: VIN = 9V

■ Only Four External Components Required

■ 130µA Standby Current

■ Active Low Micropower Shutdown

U

APPLICATIO S

■ Distributed Power Systems

■ Step-Down Converters

■ Inverting Converters

■ Memory Backup Supply

■ Portable Instruments

■ Battery-Powered Equipment

LTC1174

LTC1174-3.3/LTC1174-5

High Efficiency

Step-Down and Inverting

DC/DC Converter

DESCRIPTIO

The LTC®1174 is a simple current mode DC/DC converter

ideally suited for 9V to 5V, 5V to 3.3V or 5V to – 5V

operation. With an internal 0.9Ω switch (at a supply

voltage of 9V), the LTC1174 requires only four external

components to construct a complete high efficiency

DC/DC converter.

Under a no load condition the LTC1174 draws only 130µA.

In shutdown, it draws a mere 1µA making this converter

ideal for current sensitive applications. In dropout, the

internal P-channel MOSFET switch is turned on continu-

ously allowing the user to maximize the life of the battery

source.

The maximum inductor current of the LTC1174 family is

pin selectable to either 340mA or 600mA, optimizing

efficiency for a wide range of applications. Operation up to

200kHz permits the use of small surface mount inductors

and capacitors.

For applications requiring higher output current or ultra-

high efficiency, see the LTC1148 data sheet.

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

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

High Efficiency Step-Down Converter

VIN

9V

6

3

LBIN

2

LBOUT

7 IPGM

VIN

8

SHUTDOWN

VOUT 1

SW 5

LTC1174-5

GND

4

* (3) AVX TPSD156K025

** AVX TPSD107K010

† COILTRONICS CTX100-4

+ 15µF*

25V

×3

100µH†

+

1N5818

5V

175mA

100µF**

10V

1174 TA01

100

95

90

85

80

75

70

1

LTC1174-5 Efficiency

VIN = 6V

VIN = 9V

L = 100µH

VOUT = 5V

IPGM = 0V

10

LOAD CURRENT (mA)

100 200

1174 TA02

1174fe

1

Share Link: