TPS54225

www.ti.com

SLVSA15C

– OCTOBER 2009 – REVISED FEBRUARY 2011

PIN FUNCTIONS

PIN

DESCRIPTION

NAME

NO.

VO

1

Connect to output of converter. This pin is used for On-Time Adjustment.

VFB

2

Converter feedback input. Connect with feedback resistor divider.

VREG5

3

5.5 V power supply output. A capacitor (typical 1

μF) should be connected to GND.

SS

4

Soft-start control. A external capacitor should be connected to GND.

GND

5

Signal ground pin

PG

6

Open drain power good output

EN

7

Enable control input

Ground returns for low-side MOSFET. Also serve as inputs of current comparators. Connect PGND and

PGND1, PGND2

8, 9

GND strongly together near the IC.

Switch node connection between high-side NFET and low-side NFET. Also serve as inputs to current

SW1, SW2

10, 11

comparators.

Supply input for high-side NFET gate driver (boost terminal). Connect capacitor from this pin to

VBST

12

respective SW1, SW2 terminals. An internal PN diode is connected between VREG5 to VBST pin.

VIN

13

Power input and connected to high side NFET drain

VCC

14

Supply input for 5 V internal linear regulator for the control circuitry

Thermal pad of the package. Must be soldered to achieve appropriate dissipation. Should be connected

PowerPAD

™

Back side

to PGND.

© 2009–2011, Texas Instruments Incorporated

5

Product Folder Link(s): TPS54225