LTC1754-5_15 datasheet(5/12 Pages) LINER

Part #	LTC1754-5

Description	Micropower, Regulated 3.3V/5V Charge Pump with Shutdown in SOT-23

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Manufacturer	LINER [Linear Technology]

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5

LTC1754-3.3/LTC1754-5

VOUT (Pin 1): Regulated Output Voltage. For best perfor-

mance, VOUT should be bypassed with a 6.8µF (min) low

ESR capacitor as close as possible to the pin.

GND (Pin 2): Ground. Should be tied to a ground plane for

best performance.

SHDN (Pin 3): Active Low Shutdown Input. A low on

SHDN disables the LTC1754. SHDN must not be allowed

to float.

C– (Pin 4): Flying Capacitor Negative Terminal.

VIN (Pin 5): Input Supply Voltage. VIN should be bypassed

with a 6.8

µF (min) low ESR capacitor.

C + (Pin 6): Flying Capacitor Positive Terminal.

SI

PLIFIED BLOCK DIAGRA

TYPICAL PERFOR A CE CHARACTERISTICS

LTC1754-3.3. LTC1754-5, TA = 25°C unless otherwise noted.

Oscillator Frequency

vs Supply Voltage

Efficiency vs Supply Voltage

SUPPLY VOLTAGE (V)

2.0

70

80

100

3.5

4.5

1754 G19

60

50

2.5

3.0

4.0

5.0

5.5

40

30

90

TA = 25°C

CFLY = 1µF

LTC1754-5

IOUT = 25mA

LTC1754-3.3

IOUT = 20mA

SUPPLY VOLTAGE (V)

2.0

800

3.5

1754 G20

650

550

2.5

3.0

4.0

500

450

850

750

700

600

4.5

5.0

5.5

TA = 85°C

TA = 25°C

TA = –40°C

SUPPLY VOLTAGE (V)

2.0

0.85

0.90

0.95

3.5

4.5

1754 G21

0.80

0.75

2.5

3.0

4.0

5.0

5.5

0.70

0.65

TA = –40°C

TA = 25°C

TA = 85°C

–

+

COMP1

2

*

C+

CFLY

1

µF

C–

*CHARGE PUMP SHOWN IN PHASE 1, THE CHARGING PHASE.

PHASE 1 IS ALSO THE SHUTDOWN PHASE

1

2

CONTROL

VREF

COUT

10

µF

CIN

10

µF

VIN

1754 BD

VOUT

SHDN

VSHDN Threshold Voltage

vs Supply Voltage

PI FU CTIO S

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LTC1754-5 Datasheet(PDF) 5 Page - Linear Technology

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