LTC3871 datasheet(20/24 Pages) LINER

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LTC7106

Rev A

For more information www.analog.com

APPLICATIONS INFORMATION

Figure 10. Using the LTC7106 to Margin High μModule LTM4636 Providing 1.2V to 2.0V at 40A

Case Two

In this case, the μModule LTM4636 provides a 1.2V output

and requires to margin high VOUT from 1.2V to 2.0V (see

Figure10).TheVFBoftheLTM4636isagain 0.6V.However,

the top voltage divider is internal (RTOP = 4.99kΩ), so the

RBOT is also fixed at 4.99kΩ. Then IDAC = (1.2V – 2.0V)/

4.99kΩ = –160μA.

So we have to choose MFR_CONTROL [6:5] = 10

(Range = High) to set IDAC LSB = 4μA.

From Table 3, choose DAC[6:0] = 1011000 to set the

IDAC = –160µA, which will margin VOUT from 1.2V to 2.0V.

GPO

1µF

10k

22pF

115k

100µF

22µF

0.1µF

34.8k

4.7µF

470µF

4.99k

100µF

LTC7106

VDD

GND

SDA

SCL

ALERT

GPO

ASEL0

ASEL1

VDD

2.5V TO 5.5V

SDA

ALERT

SCL

LTM4636

RUNC

RUNP

HIZREG

FREQ

MODE/PLLIN

SNSP1

PVCC

TRACK/SS

VOUT

VOUTS1+

VOUTS1-

VFB

SNSP2

COMPA

COMPB

VIN

INTVCC PVCC

25V

4.70V TO 15V

16V

×5

PVCC

INTVCC

×3

SGND PGND

TEMP+ TEMP–

OPTIONAL TEMP MONITOR

PINS NOT USED IN THIS CIRCUIT:

CLKOUT,GMON, PGOOD,PHMODE,PWM,

SW,TEST1,TEST2,TEST3,TEST4,TMON

6.3V

VOUT

1.2V, 40A

VIN < = 5.5V, TIE VIN, INTVCC AND PVCC

TOGETHER, TIE RUNP TO GND,

VIN > 5.5V, THEN OPERATE AS SHOWN

IDAC

160 A

TO MARGIN HIGH

VOUT FROM

1.2V TO 2V

10k

7106 F10

PMBus INTERFACE

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