AS3715 datasheet(13/160 Pages) AMSCO

13 / 160 page

ams Datasheet, Confidential

Page 13

[v1-00] 2014-Sep-10

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AS3715 − Detailed Description – 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 2A (SD1), and 1A for (SD2, SD3), with an output capacitor of

only 8-12μF. The implemented current limitation protects the

DCDC and the coil during overload condition.

Figure 7:

Step Down DC/DC Converter Block Diagram

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

Detailed Description – Power

Management Functions

Logic

IMIN

ILIMIT

250/600mA

1.2/2.5A

ISENSEP

ISENSEN

Zero

Comparator

PWM

Comparator

Overvoltage

Comparator

Ref + 8%

Ref - 5%

Slope

Compensation

Softstart

Ref = 0.6V

Skip

sdX_low_noise

clk

sdX_lv

sdX_vsel

FB_SDx

VSS_SDx

LX_SDx

VOUT

VSUP_SDx

CVSUP_SDx

LSDx

COUT_SDx

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