LTC3108IDE datasheet(5/20 Pages) LINER

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LTC3108

3108p

LDO Load Regulation

TYPICAL PERFORMANCE CHARACTERISTICS

Resonant Switching Waveforms

Start-Up Voltage Sequencing

VOUT and PGD Response

During a Step Load

VOUT Ripple

LDO Step Load Response

Enable Input and VOUT2

Running on Storage Capacitor

TA = 25°C, unless otherwise noted.

LDO Dropout Voltage

LDO LOAD (mA)

–1.00

–0.75

–0.50

0.5

1.5

2.5

3.5

–0.25

0.00

3108 G10

LDO LOAD (mA)

0.00

0.04

0.08

0.12

0.5

1.5

2.5

3.5

0.16

0.20

0.02

0.06

0.10

0.14

0.18

3108 G11

10μs/DIV

C1 PIN

2V/DIV

C2 PIN

2V/DIV

SW PIN

50mV/DIV

3108 G09

VIN = 20mV

1:100 RATIO TRANSFORMER

10sec/DIV

3108 G12

CH1

VSTORE

1V/DIV

CH2, VOUT

1V/DIV

CH3, VLDO

1V/DIV

VIN = 50mV

1:100 RATIO TRANSFORMER

COUT = 220μF

CSTORE = 470μF

CLDO = 2.2μF

5ms/DIV

3108 G13

CH2

VOUT

1V/DIV

CH1

PGD

1V/DIV

50mA LOAD STEP

COUT = 220μF

100ms/DIV

3108 G14

20mV/

DIV

30μA LOAD

COUT = 220μF

1ms/DIV

3108 G16

CH2, VOUT2

1V/DIV

CH1

VOUT2_EN

1V/DIV

10mA LOAD ON VOUT2

COUT = 220μF

5sec/DIV

3108 G17

CH2, VOUT

1V/DIV

CH1, VIN

50mV/DIV

CH3

VSTORE

1V/DIV

CH4, VLDO

1V/DIV

CSTORE = 470μF

VOUT LOAD = 100μA

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