LTM4645 datasheet(10/34 Pages) LINER

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LTM4646

4646f

For more information www.linear.com/LTM4646

BLOCK DIAGRAM

Figure 1. Simplified LTM4646 Block Diagram

+–

RUN1 AND RUN2

SEPARATE:

DRVCC

EXTVCC

MODE_PLLIN

CLKOUT

PHASMD

RUN2

SGND

100k

POWER

CONTROL

LOGIC

BLOCK

VIN

DRVCC

MTOP2

1µF

0.47µH

GATE

DRIVE

INTERNAL

COMP

COMP2A

TRACK/SS1

FREQ

VRNG

INTVCC

COMP2B

COMP1A

COMP1B

115k

350kHz

SGND

RUN1

VIN

4.7µF

130k

TRACK/SS2

PGOOD2

SGND

CSS

VFB1

0.555V

PGOOD2

BLOCK

SGND

1µA

0.645V

0.6V REF

50k

LOCATED NEAR

POWER STAGES

470pF

VOUT2

60.4k

49.9Ω

MBOT2

1µF

1µA

VFB2

VOUTS2–

TEMP2+

TEMP2–

VOUTS2

COUT2

RFB3

30.1k

GND

TEMP SENSOR

SGND

VOUT2

VOUT2 1.2V/10A

SW2

VIN

PGOOD1

–

VFB2

RFB2

60.4k

CIN3

10µF

25V

CIN4

10µF

25V

SGND

CSS

SGND

100k

INTVCC

1µF

–

SGND

0.6V

REF

VFB1

0.555V

PGOOD1

BLOCK

0.645V

–

LOCATED NEAR POWER STAGES

PNP

470pF

TEMP1+

TEMP1–

TEMP SENSOR

VOUT1

60.4k

49.9Ω

×1

VFB1

VOUTS1

RFB1

40.2k

VIN

MTOP1

1µF

0.47µH

GATE

DRIVE

MBOT1

1µF

COUT1

GND

VOUT1

1.5V/10A

SW1

VIN

CIN1

10µF

25V

CIN2

10µF

25V

100µF

25V

TOP G

BOT G

DRVCC

LDO

DRVCC

CPWR

VOUTS1–

VIN 4.5V TO 20V

GND

RUN1 AND RUN2

TIED TOGETHER:

GND

INTERNAL

COMP

0.6V

0.3V

SEE FIGURE 18

2Ω

PNP

tSOFT-START =

CSS

1µA • 0.6V

)

(

RFREQ =

41550

f(kHz)

– 2.2

)

(

RPULLUP =

VIN(MIN) • 100k

1.3

– 100k

)

(

RPULLUP =

VIN(MIN) • 50k

1.3

– 50k

)

(

4646 F01

LTM4645 Datasheet(PDF) 10 Page - Linear Technology

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