LTC3261(2012) 查看數據表（PDF） - Linear Technology

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LTC3261
(Rev.:2012)

High Voltage, Low Quiescent Current Inverting Charge Pump

Linear Technology 

LTC3261

TYPICAL PERFORMANCE CHARACTERISTICS

(TA = 25°C, CFLY = 1μF, CIN = COUT = 10μF unless otherwise noted)

Voltage Loss (VIN – |VOUT|)

vs Output Current

(Constant Frequency Mode)

3.0

fOSC = 50kHz

fOSC = 200kHz

2.5

fOSC = 500kHz

VIN = 12V

2.0

Effective Open-Loop Resistance

vs Supply Voltage

90

80

70

fOSC = 200kHz

60

VOUT Load Transient Burst Mode

Operation (MODE = H)

VOUT

500mV/DIV

AC-COUPLED

50

1.5

fOSC = 500kHz

40

–5mA

IOUT

–50mA

1.0

30

0.5

0.0

0.1

1

10

OUTPUT CURRENT (mA)

100

3261 G09

20

10

0

0 5 10 15 20 25 30 35

SUPPLY VOLTAGE (V)

3261 G10

VIN = 12V

fOSC = 500kHz

2ms/DIV

3261 G11

VOUT Transient

(MODE = Low to High)

VOUT

500mV/DIV

AC-COUPLED

MODE

Average Input Current

vs Output Current

100

MODE = L

10

MODE = H

1

VOUT Ripple

VOUT

10mV/DIV

AC-COUPLED

VOUT

200mV/DIV

AC-COUPLED

MODE = L

MODE = H

VIN = 12V

fOSC = 500kHz

IOUT = –5mA

2ms/DIV

3261 G12

0.1

0.1

VIN = 12V

fOSC = 500kHz

1

10

100

OUTPUT CURRENT (mA)

3261 G13

VIN = 15V

fOSC = 500kHz

IOUT = 5mA

100μs/DIV

3261 G14

3261f

5

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