AP61200/AP61201/AP61202/AP61203

Document number: DS44251 Rev. 3 - 2

3 of 21

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September 2022

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AP61200/AP61201/AP61202/AP61203

Pin Descriptions

Pin Name

Pin Number

Function

FB

1

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.

GND

2

Power Ground.

VIN

3

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

VIN with a 2.3V to 5.5V 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

4

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.

EN

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.

OUT

(AP61200/AP61201)

6

Output Voltage Power Rail. Connect OUT to the output load as shown in Figure 1. OUT cannot be tied to

GND but can be treated as a No Connect pin and left floating. If left floating, then a feed-forward capacitor,

C3, must be used as shown in Figure 2.

PG

(AP61202/AP61203)

Power-Good. Open drain power-good output that is pulled to GND when the output voltage is out of its

regulation limits or during soft-start.

Functional Block Diagram

EN

SW

VIN

3

0.6V

4

2

GND

+

+

-

+

Control

Logic

SE

OCP

S

VIN

Q

R

Q

SW

On-Time

Compute

One-Shot

Minimum

Off-Time

VIN OVP

UVLO

Internal

Reference

Internal

Soft-Start

0.6V

Q1

Q2

ON

5

Shutdown

Comparator

DISCHARGE

FB

OUT

AP61200/AP61201

1

6

Thermal

Shutdown

5MΩ

VIN

6

PG

AP61202/AP61203

DISCHARGE

MODE

Figure 5. Functional Block Diagram