TPS62420-Q1 Datasheet, PDF (1/36 Pages) Texas Instruments – 2.25-MHz 600-mA/1000-mA DUAL STEP-DOWN CONVERTER

TPS62420-Q1
www.ti.com
SLVSA56 – DECEMBER 2009
2.25-MHz 600-mA/1000-mA DUAL STEP-DOWN CONVERTER
Check for Samples: TPS62420-Q1
FEATURES
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• Qualified for Automotive Applications
• 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 3.3-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).
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
100
90
80
70
V _OUT2 = 1.8V
60
V _IN = 3.6V
MODE/DATA = 0
50
V _OUT1 = 1.5V
EN_2
L2
SW2
V_OUT2 = 1.8V
40
2.2 μH _R21
C_ff2
Up to 1000mA
30
MODE/
DATA
ADJ2
360kΩ ^33pF
C_OUT2 = 22 µF
20
R22
GND
180kΩ
10
0
0.01
0.1
1
10
IOUT mA
100
1000
T_J
–40°C to 125°C
QFN – DRC
ORDERING INFORMATION⁽¹⁾
PACKAGE ⁽²⁾
ORDERABLE PART NUMBER
Reel of 3000
TPS62420QDRCRQ1
TOP-SIDE MARKING
OEP
(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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated