LTM4675 datasheet(4/20 Pages) LINER

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LTC3870-1

38701f

For more information www.linear.com/LTC3870-1

Typical perForMance characTerisTics

Load Step (Discontinuous Conduction

Mode) 4-Phase Operation

LTC3887-1 and LTC3870-1

Load Step (Forced Continuous

Mode) 4-Phase Operation

LTC3887-1 and LTC3870-1

Inductor Current at Light Load

Efficiency vs Load Current

Full Load (ILOAD = 20A/Phase)

Efficiency and Power Loss vs

Input Voltage

VIN = 12V

VOUT = 1.8V

L = 0.56µH

DCR = 1.61mΩ

fSW = 350kHz

CCM

DCM

LOAD CURRENT (A)

0.1

100

3874 G01

VIN = 12V

VOUT = 3.3V

fSW = 350kHz

L = 1µH

DCR = 2.4mΩ

CCM

DCM

LOAD CURRENT (A)

0.1

100

38701 G02

VOUT = 1.8V

L = 0.56µH

DCR = 1.61mΩ

EFFICIENCY

POWER LOSS

INPUT VOLTAGE (V)

5 6 7 8 9 10 11 11 12 13 14 15 16

91.0

91.5

92.0

92.5

93.0

93.5

2.5

2.6

2.7

2.8

2.9

3.0

38701 G03

VIN = 12V

VOUT = 1.0V

50µs/DIV

ILOAD

50A/DIV

0A TO 20A TO 0A

VOUT

50mV/DIV

AC–COUPLED

INDUCTOR CURRENT

LTC3887–1 (CH0)

10A/DIV

INDUCTOR CURRENT

LTC3870–1 (CH0)

10A/DIV

38701 G04

VIN = 12V

VOUT = 1.0V

50µs/DIV

ILOAD

50A/DIV

0A TO 20A TO 0A

VOUT

50mV/DIV

AC–COUPLED

INDUCTOR CURRENT

LTC3887–1 (CH0)

10A/DIV

INDUCTOR CURRENT

LTC3870–1 (CH0)

10A/DIV

38701 G05

1µs/DIV

LTC3870–1 (CH1)

FORCED

CONTINUOUS

MODE

5A/DIV

LTC3870–1 (CH1)

DISCONTINUOUS

MODE

5A/DIV

38701 G06

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