TPS62420-Q1
www.ti.com
SLVSA56 –DECEMBER 2009
2.25-MHz 600-mA/1000-mA DUAL STEP-DOWN CONVERTER
Check for Samples: TPS62420-Q1
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FEATURES
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Qualified for Automotive Applications
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Power Save Mode at Light Load Currents
High Efficiency: Up to 95%
180° Out of Phase Operation
VIN Range From 2.5 V to 6 V
Output Voltage Accuracy in PWM Mode: ±1%
2.25-MHz Fixed Frequency Operation
Output Current: 600 mA and 1000 mA
Adjustable Output Voltage From 0.6 V to VIN
Typical 32-μA Quiescent Current for Both
Converters
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100% Duty Cycle for Lowest Dropout
Available in a 10-Pin QFN (3×3mm)
EasyScale™ Optional One-Pin Serial Interface
for Dynamic Output Voltage Adjustment
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 3.3-V or 5-V voltage rail.
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 2.25-MHz fixed switching frequency and enters 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 1.2 μA. 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 (3mm×3mm QFN).
TPS62420
VIN 2.5V – 6V
100
90
VIN
FB 1
SW1
L1
VOUT1 = 1.5V
up to 600mA
CIN
80
70
60
50
40
30
20
10
0
2.2 μH
R11
270kΩ
10 μF
V
= 1.8V
OUT2
COUT1 = 22 µF
V
= 3.6V
DEF_1
IN
MODE/DATA = 0
R12
180kΩ
EN_1
V
= 1.5V
OUT1
L2
V
OUT2 = 1.8V
EN_2
SW2
2.2 μH
Up to 1000mA
COUT2 = 22 µF
Cff2
33pF
R21
360kΩ
MODE/
DATA
ADJ2
GND
R22
180kΩ
0.01
0.1
1
10
100
1000
I
mA
OUT
ORDERING INFORMATION(1)
TJ
–40°C to 125°C
PACKAGE(2)
ORDERABLE PART NUMBER
TOP-SIDE MARKING
OEP
QFN – DRC
Reel of 3000
TPS62420QDRCRQ1
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
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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.
PRODUCTION DATA information is current as of publication date.
Copyright © 2009, 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.