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SLVS676B – JUNE 2006 – REVISED OCTOBER 2006
2.25MHz 600mA/1000mA Dual Step Down Converter In Small 3x3mm QFN Package
FEATURES
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High Efficiency—up to 95%
V
IN
Range From 2.5 V to 6 V
2.25 MHz Fixed Frequency Operation
Output Current 600 mA and 1000 mA
Adjustable Output Voltage From 0.6 V to V
IN
EasyScale™ Optional One Pin Serial Interface
for Dynamic Output Voltage Adjustment
Power Save Mode at Light Load Currents
180° Out of Phase Operation
Output Voltage Accuracy in PWM Mode
±1%
Typical 32
µA
Quiescent Current for both
Converters
100% Duty Cycle for Lowest Dropout
Available in a 10-Pin QFN (3×3mm)
DESCRIPTION
The TPS62420 device is a synchronous dual
step-down DC-DC converter optimized for battery
powered portable applications. It provides two
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
voltage rail.
With an input voltage range of 2.5V to 6V, the
TPS62420 is ideal to power portable applications like
smart phones, PDAs, and other portable equipment.
With the EasyScale™ serial interface the output
voltages can be modified during operation. It
therefore supports Dynamic Voltage Scaling for low
power DSP and processors.
The TPS62420 operates at 2.25MHz fixed switching
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
frequency PWM mode by pulling the MODE/DATA
pin high. In the shutdown mode, the current
consumption is reduced to 1.2µA. The device allows
the use of small inductors and capacitors to achieve
a small solution size.
The TPS62420 is available in a 10-pin leadless
package (3×3mm QFN)
V
OUT1
= 1.5V
R11
270k
R12
180k
L2
Efficiency
100
APPLICATIONS
Cell Phones, Smart-phones
PDAs, Pocket PCs
OMAP™ and Low Power DSP Supply
Portable Media Players
Digital Radio
Digital Cameras
TPS62420
VIN 2.5V
–
6V
C
IN
10 F
DEF_1
EN_1
VIN
FB 1
SW1
L1
2.2 H
up to 600mA
C
OUT1
= 22 µF
90
80
70
V
OUT2
= 1.8V
V
IN
= 3.6V
MODE/DATA = 0
60
EN_2
SW2
V
OUT2
= 1.8V
R21
360k
R22
180k
C
ff2
33pF
Up to 1000mA
C
OUT2
= 22 µF
50
V
OUT1
= 1.5V
2.2 H
40
MODE/
DATA
ADJ2
GND
30
20
10
0
0.01
0.1
1
I OUT mA
10
100
1000
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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
