LTC3214 datasheet(4/12 Pages) LINER

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LTC3214

3214fb

2x Mode Charge Pump

Open-Loop Output Resistance

(2VIN – VCPO)/ICPO vs Temperature

Input Shutdown Current

vs Input Voltage

Oscillator Frequency

vs Supply Voltage

Efﬁciency vs VIN

ISET/ILED Current Ratio

vs ILED Current

ILED Current vs Input Voltage

1.5x Mode CPO Output Ripple

2x Mode CPO Output Ripple

–40

–15

TEMPERATURE (°C)

3216 G05

VIN = 3.6V

CIN = C1 = C2 = 2.2μF

CCPO = 4.7μF

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

3214 G06

INPUT VOLTAGE (V)

2.9

4.5

3.3

3.7

4.1

3.1

3.5

3.9

4.3

TA = 85°C

TA = –40°C

TA = 25°C

910

900

870

890

880

860

850

840

830

3214 G07

SUPPLY VOLTAGE (V)

2.9

4.5

3.3

3.7

4.1

3.1

3.5

3.9

4.3

TA = 85°C

TA = –40°C

TA = 25°C

VIN (V)

2.9

100

3.3

3.7

3.9

3215 G08

3.1

3.5

4.1

4.3

4.5

100mA

50mA

300mA

200mA

LED = AOT2015

VF = 2.9V TYP AT 100mA

ILED CURRENT (mA)

2700

2800

2900

3000

–40°C

85°C

3100

200

100

300

400

500

3214 G09

3200

3300

25°C

VIN (V)

600

500

400

300

200

100

3214 G10

2.9

4.5

3.3

3.7

4.1

3.1

3.5

3.9

4.3

72.2k

36.6k

17.4k

11.8k

7.15k

3214 G11

VCPO

50mV/DIV

500ns/DIV

VIN = 3.6V

ICPO = 200mA

3214 G12

VCPO

50mV/DIV

A/C COUPLED

500ns/DIV

VIN = 3.6V

ICPO = 400mA

TYPICAL PERFORMANCE CHARACTERISTICS (T

A = 25°C unless otherwise speciﬁed)

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