NCP5252

http://onsemi.com

3

AGND

LX

PGND

VO

COMP

FB

VOUT

GND

NCP5252

4.5 TO 13.2V

Figure 2. NCP5252 Typical Application Circuits

PIN FUNCTION DESCRIPTION

Pin No

Symbol

Description

1

Internal LDO power supply

2

BST

Top MOSFET driver input supply, a bootstrap capacitor connection between LX and this pin.

3

PGOOD

Power good indicator of the output voltage. High impedance (open drain) if power good (in regulation).

Low impedance if power not good.

4

EN/SKIP

This pin serves as two functions. Enable: Logic control for enabling the switcher. SKIP: Power saving

mode (Skip and Force PWM) programmable pin.

5

COMP

Output of the error amplifier.

6

FB

Output voltage feed back.

7

VO

Output voltage.

8

AGND

Analog ground.

9

FREQ_SET

Frequency selection pin,

0 V = 333k, No connect = 500 kHz, 5 V = 1.0 MHz

10

V5

Power supply for analog circuit.

11−13

PGND

Ground reference and high−current return path for the bottom power MOSFET.

14−15

LX

Switch node between the top MOSFET and bottom MOSFET.

16

Internal Main FET power supply

17

EPAD

Connect to PGND for thermal enhancement. Exposed pad is not electrically connected.