AS3722 datasheet(20/198 Pages) AMSCO

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[v1-01] 2015-Sep-07

AS3722 − Detailed Descriptions- Power Management Functions

DCDC Step-Down Converter

Description

The step-down converter is a high efficiency fixed frequency

current mode regulator. By using low resistance internal PMOS

and NMOS switches efficiency up to 95% can be achieved. The

fast switching frequency allows using small inductors, without

increasing the current ripple. The unique feedback and

regulation circuit guarantees optimum load and line regulation

over the whole output voltage range, up to an output current

of 1.5A (SD4, SD5), 2A (SD3) and 5A for SD2, with an output

capacitor of only 8-27μF. The implemented current limitation

protects the DCDC and the coil during overload condition.

Figure 9:

Step Down DC/DC Converter Block Diagram

DCDC Step Down Converter Block Diagram: Shows the internal structure of the DCDC bucks.

Detailed Descriptions-

Power Management Functions

Zero Comp

1.2/1.8/2.9A

Ilimit

250/400/600mA

Imin

sdx_low_noise

clk

Ref +8%

Overvoltage

Comp

skip

Ref -5%

IsenseP

IsenseN

Ref=0.6V

skip

PWM

Comp

Slope

Compensation

sdX_lv

VSUP_SDx

LX_SDx

VSS_SDx

FB_SDx

softstart

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