LTC3871 datasheet(21/24 Pages) LINER

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LTC7106

Rev A

For more information www.analog.com

Figure 11. Using the LTC7106 with a Boost Controller to Vary VOUT from 28V to 18V

APPLICATIONS INFORMATION

Case Three

The LTC7106 can also work with boost converters. In

this case, the LTC3784, a synchronous boost controller,

providesa2-phase28V/10Aoutputandrequirestocontrol

VOUT from 28V to 18V (see Figure 11). The VFB is 1.2V

and the voltage dividers are external. Based on the same

design criteria in Case One, we can choose RTOP = 200kΩ

and RBOT = 8.97kΩ for the best accuracy. Then IDAC =

(28V – 18V)/200kΩ = +50µA. Choose MFR_CONTROL

[6:5] = 00 (Range Nominal) to set IDAC LSB = 1µA. By

looking in Table 2, choose DAC[6:0] = 0001110 to set the

IDAC = +50μA, which will margin VOUT from 28V to 18V.

0.1µF

GPO

INTVCC

1µF

10k

LTC7106

VDD

GND

SDA

SCL

ALERT

GPO

ASEL0

ASEL1

VDD

2.5V TO 5.5V

SDA

ALERT

SCL

LTC3784

PGOOD

FREQ

OVMODE

VBIAS

MODE/PLLIN

ITH

SENSE1–

SENSE1+

TG1

SW1

INTVCC

SGND

PGND

+50µA

TO MARGIN LOW VOUT

FROM 28V TO 18V

100pF

15nF

8.66k

0.1µF

100k

47µF

VBATT

12V

DOWN TO 2.3V AFTER

START-UP IF VBIAS IS

POWERED FROM VOUT

BG1

BOOST1

SENSE2–

SENSE2+

SW2

BG2

BOOST2

TG2

VFB

4.7µF

4mΩ

0.1µF

200k

3.3 H

4mΩ

3.3 H

VOUT

28V AT 10A

220µF

8.97k

IDAC

7106 F11

PMBus INTERFACE

10k

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