AP63200/AP63201/AP63203/AP63205

Typical Application Circuit

AP63205

L

4.7µH

C3

100nF

C2

2x22

μF

C1

10

μF

3

VIN

2

EN

5

SW

6

BST

1

FB

4

GND

OUTPUT

5V

INPUT

Figure 1. Typical Application Circuit

Figure 2. Efficiency vs. Output Current

Pin Descriptions

Pin Number

Pin Name

Function

1

FB

Feedback sensing terminal for the output voltage. Connect this pin to the resistive divider of the output.

See Setting the Output Voltage section for more details.

2

EN

Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the regulator and low

to turn it off. Attach to VIN or leave open for automatic startup. The EN has a precision threshold of 1.18V for

programing the UVLO. See Enable section for more details.

3

VIN

Power Input. VIN supplies the power to the IC, as well as the step-down converter switches. Drive VIN with a

3.8V to 32V power source. Bypass VIN to GND with a suitably large capacitor to eliminate noise due to the

switching of the IC. See Input Capacitor section for more details.

4

GND

Power Ground.

5

SW

Power Switching Output. SW is the switching node that supplies power to the output. Connect the output LC filter

from SW to the output load. Note that a capacitor is required from SW to BST to power the high-side switch.

6

BST

High-Side Gate Drive Boost Input. BST supplies the drive for the high-side N-Channel MOSFET. A 100nF

capacitor is recommended from SW to BST to power the high-side switch.

AP63200/AP63201/AP63203/AP63205

Document number: DS41326 Rev. 2 - 2

2 of 18

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January 2019

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