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[v1-01] 2015-Sep-07

AS3722 − Detailed Descriptions- Power Management Functions

DCDC Step-Down Controller

Description

The Step-Down controller SD1 and SD6 are dual phase

controller using an external power-stage incorporating 2

phases to achieve higher output currents. The maximum output

current when using the AS3729 power stage is 6A (peak) with

having 3A (peak) per phase. When using the AS3729B power

stage, the current can be up to 4A (peak) per phase. This allows

the use of low profile coils without compromising on

performance.

Figure 23:

SD1 DC/DC Buck Controller 8A Peak Block Diagram

SD1 DC/DC Buck Controller: Shows basic connection of the SD1 controller to the external power stage

(AS3729B) for 8Apeak output current.

When using the AS3728 power stage a dual phase controller

can support up to 8A (4A per phase). The AS3728 is a HV power

stage being capable of operating from input voltage up to 14V

for multi-cell designs.

TEMP

CTRL1

CTRL2

LX2

LX 1

PVSS

0.47uH

FB_SDx

Vout (0.6-1.5V@8A)

DVM, 10mV steps

47uF

VSUP

10uF

47uF

AS3729B

controller

TEMP _SDx

CTRL1_SDx

CTRL2_SDx

FB_SDx

VSUP

10uF

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