TPS62420 Datasheet, PDF (1/32 Pages) Texas Instruments – 2.25MHz 600mA/1000mA Dual Step Down Converter In Small 3x3mm QFN Package

TPS62420
www.ti.com
SLVS676B – JUNE 2006 – REVISED OCTOBER 2006
2.25MHz 600mA/1000mA Dual Step Down Converter In Small 3x3mm QFN Package
FEATURES
• 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)
APPLICATIONS
• Cell Phones, Smart-phones
• PDAs, Pocket PCs
• OMAP™ and Low Power DSP Supply
• Portable Media Players
• Digital Radio
• Digital Cameras
VIN 2.5V – 6V
C_IN
10 μF
TPS62420
VIN
EN_1
FB 1
SW1
DEF_1
L1
2.2 μH _R11
270kΩ
R12
180kΩ
V_OUT1 = 1.5V
up to 600mA
C_OUT1 = 22 µF
EN_2
MODE/
DATA
SW2
ADJ2
GND
L2
2.2 μH _R21
C_ff2
360kΩ ^33pF
R22
180kΩ
V_OUT2 = 1.8V
Up to 1000mA
C_OUT2 = 22 µF
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)
100
90
80
70
V _OUT2 = 1.8V
60
V _IN = 3.6V
MODE/DATA = 0
50
V _OUT1 = 1.5V
40
30
20
10
0
0.01
0.1
1
10
IOUT mA
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