Datasheet
V
OUT2
SW1
FB1
SW2
ADJ2
DEF_1
OUT2
C
IN
10 μF
VIN2.5V – 6V
VIN
EN_1
EN_2
MODE/
DATA
TPS62420
GND
Upto1000mA
R21
360kΩ
R22
180kΩ
=1.8V
L2
2.2 μH
C =22 µF
C
ff2
33pF
upto600mA
R11
270kΩ
R12
180kΩ
V
OUT1
=1.5V
L1
2.2 μH
C
OUT1
=22 µF
0
10
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
I
OUT
mA
Efficiency
V
IN
=3.6V
MODE/DATA =0
V
OUT1
=1.5V
V
OUT2
=1.8V
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%
• V
IN
Range From 2.5 V to 6 V
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
• Adjustable Output Voltage From 0.6 V to V
IN
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.
2EasyScale, 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.