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[v1-11] 2016-Dec-14

AS3701 − Detailed Description – Power Management Functions

Step Down Converter

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 the maximum

output current, with an output capacitor of only 10μF. The

implemented current limitation protects the DCDC Converter

and the coil during overload condition.

Figure 9:

DCDC Step-Down Converter Block Diagram

Detailed Description –

Power Management Functions

Logic

IMIN

ILIMIT

170mA

800mA

ISENSEP

ISENSEN

Zero

Comparator

PWM

Comparator

Overvoltage

Comparator

Ref + 8%

Ref - 5%

Slope

Compensation

Softstart

Ref = 0.6V

Skip

Sd_low_noise

Clk

Sd_lv

buck _v

FB_SD1

VSS_SD1

LX_SD1

VOUT

VSUP

2.2uF

1uH

10uF

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