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FEATURES

DESCRIPTION

APPLICATIONS

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

SLVS676B – JUNE 2006 – REVISED OCTOBER 2006

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

•

High Efficiency—up to 95%

The TPS62420 device

is

a

synchronous

dual

step-down DC-DC converter optimized for battery

•

powered

portable

applications.

It

provides

two

•

2.25 MHz Fixed Frequency Operation

independent output voltage rails powered by 1-cell

•

Output Current 600 mA and 1000 mA

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

•

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

voltage rail.

•

EasyScale™ Optional One Pin Serial Interface

for Dynamic Output Voltage Adjustment

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

TPS62420 is ideal to power portable applications like

•

Power Save Mode at Light Load Currents

smart phones, PDAs, and other portable equipment.

•

180

° Out of Phase Operation

With the EasyScale™ serial interface the output

•

Output Voltage Accuracy in PWM Mode

±1%

voltages

can

be

modified

during

operation.

It

•

Typical 32

µA Quiescent Current for both

therefore supports Dynamic Voltage Scaling for low

Converters

power DSP and processors.

•

100% Duty Cycle for Lowest Dropout

The TPS62420 operates at 2.25MHz fixed switching

•

Available in a 10-Pin QFN (3

×3mm)

frequency and enter the Power Save Mode operation

at light load currents to maintain high efficiency over

the

entire

load

current

range.

For

low

noise

applications the devices can be forced into fixed

•

Cell Phones, Smart-phones

frequency PWM mode by pulling the MODE/DATA

•

PDAs, Pocket PCs

pin high. In the shutdown mode, the

current

•

OMAP™ and Low Power DSP Supply

consumption is reduced to 1.2

µA. The device allows

•

Portable Media Players

the use of small inductors and capacitors to achieve

•

Digital Radio

a small solution size.

•

Digital Cameras

The TPS62420 is available in a 10-pin leadless

package (3

×3mm QFN)

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.

EasyScale, OMAP, PowerPAD are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2006, 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.