AS3722 datasheet(37/199 Pages) AMSOSRAM

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[v1-01] 2015-Sep-07

AS3722 − Detailed Descriptions- Power Management Functions

Fast Regulation Mode

This mode can be used to react faster on sudden load changes

and thus minimize the over-/undershoot of the output voltage.

This mode needs a bigger output capacitor to guarantee the

stability of the regulator. The mode is enabled by setting

sdX_fast =1.

100% PMOS ON Mode for Low Dropout Regulation

For low input to output voltage difference the DCDC converter

can use 100% duty cycle for the PMOS transistor, which is then

in LDO mode.

DVS (Dynamic Voltage Setting)

For a quick change of output voltage a dedicated PWM interface

can be used for SD0 and SD6. Please refer to PWM Control

Interface chapter for more details.

DVM (Dynamic Voltage Management)

To minimize the over-/undershoot during a change of the

output voltage, the DVM can be enabled. With DVM the output

voltage will ramp up/down with a selectable slope after the new

value was written to the registers. Without DVM the slew rate

of the output voltage is only determined by external

components like the coil and load capacitor as well as the load

current.

DVM can be selected for all step-down controllers, but only for

one at a time. (see dvm_time_SDx description)

Automatic Phase Shedding

SD0, SD1 and SD6 allow automatic phase shedding which can

be enabled with sdX_phsw_on. For SD0 a minimum number of

phases for this automatic phase shedding can be defined with

sd0_nph_min.

Parameter

Figure 29:

DC/DC Buck Controller Parameter

DC/DC Buck Controller Parameter: Shows the key electrical parameter of the DC/DC buck controller

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIN

Input voltage

Pin VSUP_SDx

2.5

5.5

VOUT

Regulated output voltage

0.61

1.5

VOUT_tol

Output voltage tolerance

min. 20mV

-2

fSW

Switching frequency

fclk_int = 4MHz

2.7

MHz

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