V

OUT2

SW1

FB1

SW2

ADJ2

DEF_1

OUT2

C

IN

10 F

VIN2.5V – 6V

VIN

EN_1

EN_2

MODE/

DATA

TPS62420

GND

Upto1000mA

R21

360k

R22

180k

=1.8V

L2

2.2 H

C

=22 µF

C

ff2

33pF

upto600mA

R11

270k

R12

180k

V

L1

2.2 H

C

0

10

20

30

40

50

60

70

80

90

100

0.01

0.1

1

10

100

1000

IOUT mA

V

MODE/DATA =0

V

V

TPS62420, TPS62421

www.ti.com

SLVS676C – JUNE 2006 – REVISED JUNE 2010

2.25MHz 600mA/1000mA Dual Step Down Converter In Small 3x3mm QFN Package

Check for Samples: TPS62420, TPS62421

1

FEATURES

DESCRIPTION

2

•

High Efficiency—up to 95%

•

The

TPS62420

device

is

a

synchronous

dual

step-down DC-DC converter optimized for battery

•

2.25 MHz Fixed Frequency Operation

powered

portable

applications.

It

provides

two

•

Output Current 600 mA and 1000 mA

independent output voltage rails powered by 1-cell

•

Li-Ion or 3-cell NiMH/NiCD batteries. The device is

also suitable to operate from a standard 3.3V or 5V

•

Pin Selectable Output Voltage Supports

voltage rail.

Simple Dynamic Voltage Scaling

With an input voltage range of 2.5V to 6V, the

•

EasyScale™ Optional One Pin Serial Interface

TPS62420 is ideal to power portable applications like

for Dynamic Output Voltage Adjustment

smart phones, PDAs, and other portable equipment.

•

Power Save Mode at Light Load Currents

With the EasyScale™ serial interface the output

•

180° Out of Phase Operation

voltages

can

be

modified

during

operation.

It

•

Output Voltage Accuracy in PWM Mode ±1%

therefore supports Dynamic Voltage Scaling for low

•

Typical 32 mA Quiescent Current for both

power DSP and processors.

Converters

The TPS62420 operates at 2.25MHz fixed switching

•

100% Duty Cycle for Lowest Dropout

frequency and enter the Power Save Mode operation

at light load currents to maintain high efficiency over

•

Available in a 10-Pin QFN (3×3mm)

the

entire

load

current

range.

For

low

noise

applications the devices can be forced into fixed

APPLICATIONS

frequency PWM mode by pulling the MODE/DATA

•

Cell Phones, Smart-phones

pin

high.

In

the

shutdown

mode,

the

current

•

PDAs, Pocket PCs

consumption is reduced to 1.2mA. The device allows

•

OMAP™ and Low Power DSP Supply

the use of small inductors and capacitors to achieve a

small solution size.

•

Portable Media Players

•

Digital Radio

The TPS62420 is available in a 10-pin leadless

•

Digital Cameras

package (3×3mm QFN)

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

EasyScale, OMAP, PowerPAD are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2006–2010, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.