LTC3866 datasheet(5/22 Pages) LINER

Part #	LTC3866

Description	PolyPhase Step-Down Synchronous Slave Controller with Sub-Milliohm DCR Sensing

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC3874-1

5

38741f

For more information www.linear/LTC3874-1

Typical perForMance characTerisTics

INTVCC Line Regulation

Undervoltage Lockout Threshold

(INTVCC vs Threshold)

Current Sense Threshold vs

ITH Voltage

Quiescent Current vs Input

Voltage without EXTVCC

Maximum Current Sense Threshold

vs Common Mode Voltage

(LOWDCR = INTVCC, VITH = 2.18V)

Quiescent Current vs Temperature

without EXTVCC

Inductor Current at Light Load

Start-Up Into a Prebiased Load

2-Phase Operation LTC3884-1

and LTC3874-1

(TA = 25°C unless otherwise specified)

VITH (V)

0

–40

–20

0

20

40

60

100

80

0.5

1

2.5

1.5

3

2

38741 G10

LOWDCR = L, RANGE = H

LOWDCR = H,

RANGE = L

LOWDCR = H,

RANGE = H

LOWDCR = L,

RANGE = L

VISENSE COMMON MODE VOLTAGE (V)

0

10

15

3.5

5

0

1.0

0.5

2.0

2.5

3.0

1.5

20

25

30

38741 G11

ILIM = GND

ILIM = INTVCC

TEMPERATURE (°C)

–50

4.1

3.9

2.9

3.7

2.7

3.1

3.5

2.5

3.3

95

38741 G12

–5

45

125

FALLING

RISING

VIN = 12V

VOUT = 1.2V

1µs/DIV

DISCONTINUOUS

CONDUCTION

MODE

5A/DIV

FORCED

CONTINUOUS

MODE

5A/DIV

38741 G06

VIN 12V

VOUT = 1.2V

2ms/DIV

RUN

ALL RUN PINS

TIED TOGETHER

2V/DIV

VOUT

IN CCM

500mV/DIV

38741 G07

TEMPERATURE (°C)

–50

0

50

100

150

3

4

5

6

38741 G8

INPUT VOLTAGE (V)

0

10

20

30

40

0

1

2

3

4

5

6

38741 G9

INPUT VOLTAGE (V)

0

10

20

30

40

3

4

5

6

38741 G13

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