LTC3853IUJ-PBF datasheet(5/36 Pages) LINER

Part #	LTC3853IUJ-PBF

Description	Triple Output, Multiphase Synchronous Step-Down Controller

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC3853

5

3853f

TYPICAL PERFORMANCE CHARACTERISTICS

Efﬁciency vs Output Current

and Mode

Efﬁciency and Power Loss

vs Input Voltage

Efﬁciency vs Output Current

and Mode

Load Step

(Burst Mode Operation)

Load Step

(Forced Continuous Mode)

LOAD CURRENT (mA)

1.00E-02

1.00E-01

1.00E+00

1.00E+01

40

50

60

70

80

30

20

10

0

90

100

3853 G01

BURST

DCM

CCM

VIN = 12V

VOUT = 1.8V

FIGURE 15 MODIFIED

WITH DCR SENSING

LOAD CURRENT (mA)

1.00E-02

1.00E-01

1.00E+00

1.00E+01

40

50

60

70

80

30

20

10

0

90

100

3853 G02

BURST

DCM

CCM

VIN = 12V

VOUT = 3.3V

FIGURE 15 MODIFIED

WITH DCR SENSING

INPUT VOLTAGE (V)

0

75

80

85

15

25

3853 G03

70

65

60

510

20

90

95

100

1.0

0.8

1.2

1.4

0.4

0.6

0.2

0

1.6

1.8

2.0

30

VOUT = 3.3V

IOUT = 2A

FIGURE 15 MODIFIED

WITH DCR SENSING

EFFICIENCY

POWER LOSS

40μs/DIV

VOUT

100mV/DIV

AC COUPLED

IL

2A/DIV

ILOAD

2A/DIV

3853 G04

VIN = 12V

VOUT = 3.3V

ILOAD = 0A TO 3A

FIGURE 15 CIRCUIT

40μs/DIV

VOUT

100mV/DIV

AC COUPLED

IL

2A/DIV

ILOAD

2A/DIV

3853 G05

VIN = 12V

VOUT = 3.3V

ILOAD = 0A TO 3A

FIGURE 15 CIRCUIT

Inductor Current at Light Load

Load Step

(Pulse Skip Mode)

40μs/DIV

VOUT

100mV/DIV

AC COUPLED

IL

2A/DIV

ILOAD

2A/DIV

3853 G06

VIN = 12V

VOUT = 3.3V

ILOAD = 0A TO 3A

FIGURE 15 CIRCUIT

1μs/DIV

Burst Mode

OPERATION

2A/DIV

FORCED

CONTINUOUS

MODE

2A/DIV

PULSE SKIPPING

MODE

2A/DIV

3853 G07

VIN = 12

VOUT = 1.8V

ILOAD = 100mA

FIGURE 15 CIRCUIT

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LTC3853IUJ-PBF Datasheet(PDF) 5 Page - Linear Technology

LTC3853IUJ-PBF Datasheet(HTML) 5 Page - Linear Technology

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