DRV PACKAGE

(TOPVIEW)

MODE

FB

GND

SW

EN

VIN

1

2

3

6

5

4

r

Po

w

e

P

A

D

Zero-Pole

AMP.

Integrator

Error Amp

PFMComp

PWM

Comp .

VREF

Control

Stage

GateDriver

Anti

Shoot-Through

Current

LimitComparator

Current

LimitComparator

VREF

FB

VIN

GND

MODE

SW

EN

VIN

Softstart

VOUT RAMP

CONTROL

Thermal

Shutdown

Reference

0.6VVREF

Undervoltage

Lockout1.8V

HighSide

LowSide

Sawtooth

Generator

FB

MODE

GND

2.25MHz

Oscillator

TPS62590

SLVS897B

– JANUARY 2009 – REVISED APRIL 2011

www.ti.com

PIN ASSIGNMENTS

TERMINAL FUNCTIONS

TERMINAL

I/O

DESCRIPTION

NAME

NO.

VIN

5

PWR

VIN power supply pin.

GND

6

PWR

GND supply pin

This is the enable pin of the device. Pulling this pin to low forces the device into shutdown mode.

EN

4

I

Pulling this pin to high enables the device. This pin must be terminated.

This is the switch pin and is connected to the internal MOSFET switches. Connect the external

SW

1

OUT

inductor between this terminal and the output capacitor.

Feedback Pin for the internal regulation loop. Connect the external resistor divider to this pin. In

FB

3

I

case of fixed output voltage option, connect this pin directly to the output capacitor

MODE pin = high forces the device to operate in fixed-frequency PWM mode. Mode pin = low

MODE

2

I

enables the Power Save Mode with automatic transition from PFM mode to fixed-frequency PWM

mode.

PwPd

Must be soldered to achieve appropriate power dissipation. Should be connected to GND.

( PowerPAD

™)

FUNCTIONAL BLOCK DIAGRAM

4

Copyright

© 2009–2011, Texas Instruments Incorporated