LTC3856EFE-TRPBF datasheet(6/40 Pages) LINER

Part #	LTC3856EFE-TRPBF

Description	2-Phase Synchronous Step-Down DC/DC Controller with Diffamp

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC3856

3856f

LOAD CURRENT (A)

0.1

40

50

60

70

80

1

10

100

30

20

10

0

90

100

3856 G03

VIN = 12V

VOUT = 1.5V

Burst Mode

OPERATION

FORCED

CONTINUOUS

MODE

Stage

Shedding

MODE

100µs/DIV

ILOAD

40A/DIV

IL1

20A/DIV

IL2

20A/DIV

VOUT

200mV/DIV

VIN = 12V

VOUT = 1.5V

ILOAD = 1A TO 40A

3856 G01

VBAT = 3.6V

ICPO = 200µA

CCPO = 2.2F

100µs/DIV

ILOAD

40A/DIV

IL1

20A/DIV

IL2

20A/DIV

VOUT

200mV/DIV

VIN = 12V

VOUT = 1.5V

ILOAD = 1A TO 40A

3856 G02

VBAT = 3.6V

ICPO = 200µA

CCPO = 2.2F

1µs/DIV

FORCED

CONTINUOUS

MODE, 5A/DIV

Burst Mode

OPERATION, 5A/DIV

DCM OPERATION,

5A/DIV

VIN = 12V

VOUT = 1.5V

ILOAD = 400mA

3856 G04

VBAT = 3.6V

ICPO = 200µA

CCPO = 2.2F

Typical perForMance characTerisTics

Efficiency vs Output Current

and Mode

Inductor Current at Light Load

Stage Shedding Transition,

1-Phase to 2-Phase

Stage Shedding Transition,

2-Phase to 1-Phase

Load Step:

Burst Mode Operation

Load Step:

Forced Continuous Mode

10µs/DIV

VOUT

100mV/DIV

VSW1

10V/DIV

VSW2

10V/DIV

3856 G05

VIN = 12V

VOUT = 1.5V

UNDERSHOOT

35mV

10µs/DIV

VOUT

100mV/DIV

VSW1

10V/DIV

VSW2

10V/DIV

3856 G06

VIN = 12V

VOUT = 1.5V

OVERSHOOT

36mV

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LTC3856EFE-TRPBF Datasheet(PDF) 6 Page - Linear Technology

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