LTC1144CS8 datasheet(4/8 Pages) LINER

4 / 8 page

LTC1144

TYPICAL PERFORMANCE CHARACTERISTICS

Power Conversion Efficiency and

Supply Current vs Load Current

OSCILLATOR FREQUENCY (kHz)

0.1

2000

3000

100

LTC1144 • TPC12

1000

µF

100

µF

TA = 25°C

V+ = 15V

OSCILLATOR FREQUENCY (kHz)

0.1

100

LTC1144 • TPC11

TA = 25°C, V

+ = 15V

BOOST = OPEN

IL = 20mA

IL = 3mA

µF

100

µF

100

µF

Power Conversion Efficiency

vs Oscillator Frequency

Output Resistance

vs Oscillator Frequency

Output Voltage vs Load Current

LOAD CURRENT (mA)

–10

–5

0.001

0.1

100

LTC1144 • TPC15

–15

0.01

V+ = 15V

TA = 25°C

C1 = C2

BOOST = 15V

0.1

µF

0.1

µF

BOOST = OPEN

Output Voltage vs Load Current

LOAD CURRENT (mA)

–4

–3

–2

–1

0.001

0.1

100

LTC1144 • G14

–5

0.01

0.1

µF

0.1

µF10µF

µF

V+ = 5V

TA = 25°C

C1 = C2

BOOST = 5V

BOOST = OPEN

LOAD CURRENT (mA)

0.01

500

1000

µF

1500

0.1

LTC1144 • TPC13

100

0.1

µF

V+ = 5V

TA = 25°C

C1 = C2

BOOST = 5V

BOOST =

OPEN

0.1

µF

Ripple Voltage vs Load Current

PI FU CTIO S

Boost (Pin 1): This pin will raise the oscillator frequency

by a factor of 10 if tied high.

CAP+ (Pin 2): Positive Terminal for Pump Capacitor.

GND (Pin 3): Ground Reference.

CAP – (Pin 4): Negative Terminal for Pump Capacitor.

VOUT (Pin 5): Output of the Converter.

SHDN (Pin 6): Shutdown Pin. Tie to V + pin or leave floating

for normal operation. Tie to ground when in shutdown

mode.

OSC (Pin 7): Oscillator Input Pin. This pin can be overdriven

with an external clock or can be slowed down by connect-

ing an external capacitor between this pin and ground.

V + (Pin 8): Input Voltage.

LOAD CURRENT (mA)

100

LTC1144 • TPC10

PEFF

TA = 25°C

V+ = 5V

C1 = C2 = 10

µF

BOOST = OPEN

(SEE TEST CIRCUIT)

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