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[v1-03] 2015-Aug-10

AS3715 − Detailed Description – Power Management Functions

DCDC Step-Down Controller

Description

The Step-Down controller SD4 is a dual phase controller using

an external power-stage incorporating 2 phases to achieve

higher output currents. The maximum output current is 6A with

having 3A per phase when using the AS3729 power stage. This

allows the use of low profile coils without compromising on

performance. When using AS3729B or AS3728 (HV) power

stages the max current can be up to 8A.

Figure 17:

SD4 DC/DC Buck Controller 6A Block Diagram

SD4 DC/DC Buck Controller: Shows basic connection of the SD4 controller to the external power stage (AS3729)

for 6A output current.

Figure 18:

SD4 DC/DC Buck Controller 6A Combined Mode

SD4 DC/DC Buck Controller: Shows basic configuration of the SD4 controller to the external power stage

(AS3729) for 6A output current using a single coil in combined mode.

DCDC

0.61 1.5V

1.5/3MHz

VSUP

TEMP

CTRL1

CTRL2

LX2

LX1

PVSS

1uH

FB_SDx

CTRL2_SDx

CTRL1_SDx

TEMP_SDx

Vou t (0.61-1.5V@6A)

DVM, 10mV st eps

47uF

VSUP

10uF

47uF

AS3729

DCDC

0.61 1.5V

1.5/3MHz

VSUP

TEMP

CTRL1

CTRL2

LX2

LX1

PVSS

0.47uH

FB_SDx

CTRL2_SDx

CTRL1_SDx

TEMP_SDx

Vou t (0.61-1.5V@6A)

DVM, 10mV st eps

10 0uF

VSUP

10uF

AS3729

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