LTC1144 查看數據表（PDF） - Linear Technology

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LTC1144

Switched-Capacitor Wide Input Range Voltage Converter with Shutdown

Linear Technology 

LTC1144

Typical Application

Regulated –5V Output Voltage

Figure 12 shows a regulated –5V output with a 9V input.

With a 0mA to 5mA load current, the ROUT is below 20Ω.

Paralleling for Lower Output Resistance

Additional flexibility of the LTC1144 is shown in Figure 13.

Two LTC1144s are connected in parallel to provide a lower

effective output resistance. However, if the output resis-

tance is dominated by 1/(f × C1), increasing the capacitor

size (C1) or increasing the frequency will be of more benefit

than the paralleling circuit shown.

+

1µF

9V

1

8

2

7

3 LTC1144 6

4

5

2N2369

36k

300k

– 5V

100µF

1144 F12

Figure 12. A Regulated –5V Supply

V+

C1 +

10µF

1

8

2

7

3 LTC1144

6

C1 +

10µF

4

5

1

8

2

7

3 LTC1144 6

4

5

1/4 CD4077*

VOUT = –(V+)

+

C2

20µF

* THE EXCLUSIVE NOR GATE

SYNCHRONIZES BOTH LTC1144s

TO MINIMIZE RIPPLE

1144 F13

Figure 13. Paralleling for Lower Output Resistance

Related Parts

PART NUMBER DESCRIPTION

COMMENTS

LTC1054

15V, 100mA Inverting Charge Pump

VIN = 3.5V to 15V, VOUT(MAX) = ±15V, IQ = 2.5mA, ISD = <1µA, DIP-8,

S0-8 Packages

LTC1046

LT®3463/

LT3463A

6V, 100mA Inverting Charge Pump

250mA (ISW), Boost/Inverter Dual, Micropower

DC/DC Converter with Integrated Schottky Diodes

VIN = 1.5V to 6V, VOUT(MAX) = 3V, IQ = 200µA, ISD = <1µA, SO-8 Package

VIN = 2.4V to 15V, VOUT(MAX) = ±40V, IQ = 40µA, ISD = <1µA, DFN Package

LT1615/

LT1615-1

300mA/80mA ISW, Constant Off-Time, High Efficiency VIN = 1.2V to 15V, VOUT(MAX) = 34V, IQ = 20µA, ISD = <1µA, ThinSOT Package

Step-Up DC/DC Converter

LT3467/

LT3467A

1.1A (ISW), 1.3MHz/2.1MHz, High Efficiency Step-Up VIN = 2.4V to 16V, VOUT(MAX) = 40V, IQ = 1.2mA, ISD = <1µA, ThinSOT Package

DC/DC Converter with Integrated Soft-Start

LT1931/

LT1931A

1A (ISW), 1.2MHz/2.2MHz High Efficiency Inverting VIN = 2.6V to 16V, VOUT(MAX) = 34V, IQ = 4.2mA/5.5mA, ISD = <1µA,

DC/DC Converter

ThinSOT Package

12 Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 950Fo3r5m-7o4re1i7nformation www.linear.com/LTC1144

(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LTC1144

1144fa

LT 0414 REV A • PRINTED IN USA

 LINEAR TECHNOLOGY CORPORATION 1994

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