AP62250

Document number: DS42701 Rev. 2 - 2

3 of 21

www.diodes.com

January 2021

© Diodes Incorporated

AP62250

Pin Descriptions

Pin

Name

Pin Number

Function

SOT563

(Standard)

TSOT26

(Standard)

VIN

1

3

Power Input. VIN supplies the power to the IC as well as the step-down converter power MOSFETs. Drive VIN

with a 4.2V to 18V 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.

SW

2

2

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.

GND

3

1

Power Ground.

BST

4

6

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

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

EN

5

5

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. Leave floating for automatic startup. The EN has a precision threshold of 1.2V for programing

the UVLO. See Enable section for more details.

FB

6

4

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.

Functional Block Diagram

EN

FB

SW

VIN

0.8V

VCC

BST

GND

+

+

-

+

Control

Logic

SE

Thermal

Shutdown

S

VIN

Q

R

Q

SW

On-Time

Compute

One-Shot

Minimum

Off-Time

OCP

UVLO

Internal

Reference

Internal

Soft-Start

0.8V

VCC

Regulator

BST

Q1

Q2

ON

1.2V

I1

1.5μA

20kΩ

+

–

I2

5.5μA

Figure 3. Functional Block Diagram