LTC3445 datasheet(6/24 Pages) LINER

Part #	LTC3445

Description	I2C Controllable Buck Regulator with Two LDOs in a 4mm 횞 4mm QFN

PDF	24 Pages

Scroll/Zoom	100%

Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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6 / 24 page

LTC3445

3445fa

TYPICAL PERFOR A CE CHARACTERISTICS

Slew Rates DAC Min to DAC Max

Buck (DAC = Min)

100mA to 300mA Load Step

Buck Switching Frequency

vs VCC1

Buck (DAC = Max)

100mA to 400mA Load Step

BUCK

VOLTAGE

50mV/DIV

LOAD

CURRENT

100mA/DIV

100

µs/DIV

3445 G13

µs/DIV

3445 G14

µs/DIV

3445 G15

Buck Switching Frequency

vs Temperature

Soft-Start (DAC = Min and Max)

4.7

Ω Load

BUCK

OUTPUTS

500mV/DIV

200

µs/DIV

3445 G18

200mV/DIV

BUCK

VOLTAGE

50mV/DIV

LOAD

CURRENT

100mA/DIV

2.5

1.40

1.44

1.48

1.52

1.56

1.60

3.5

4.5

3445 G16

5.5

VCC1 (V)

TEMPERATURE (

°C)

–50

1.460

1.440

1.480

1.500

050

100

150

3445 G17

1.520

1.540

1.560

–25

125

VCC BATT vs VCC1

PowerPath LDO Load Step

1mA to 5.5mA

VCC1 RAMP (V)

VCC1

3445 G19

VTRACK = VBACKUP = 2V

VCC BATT

VCC BATT vs VTRACK

VTRACK RAMP (V)

3445 G20

VCC1 = 5.5V

VBACKUP = 2V

VCC BATT

0mA

5mA

VTRACK

VCC BATT

20mV/DIV

LOAD

CURRENT

10mA/DIV

200

µs/DIV

3445 G21

LTC3445 Datasheet(PDF) 6 Page - Linear Technology

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