TPS62404-Q1 Datasheet, PDF (1/41 Pages) Texas Instruments – 2.25-MHz 400-mA/600-mA DUAL STEP-DOWN CONVERTER

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TPS62400-Q1, TPS62401-Q1
TPS62402-Q1, TPS62403-Q1
TPS62404-Q1
SLVSA67 – FEBRUARY 2010
2.25-MHz 400-mA/600-mA DUAL STEP-DOWN CONVERTER
Check for Samples: TPS62404-Q1
FEATURES
1
• 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 400 mA and 600 mA
• Adjustable Output Voltage From 0.6 V to V_IN
• Pin Selectable Output Voltage Supports
Simple Dynamic Voltage Scaling
• EasyScale™ Optional One-Pin Serial Interface
• Power Save Mode at Light Load Currents
• 180° Out of Phase Operation
• Output Voltage Accuracy in PWM Mode ±1%
• Typical 32-mA Quiescent Current for Both
Converters
• 100% Duty Cycle for Lowest Dropout
• Available in a 10-Pin QFN (3mm×3mm)
DESCRIPTION
The TPS6240x device series are synchronous dual step-down DC-DC converters optimized for battery powered
portable applications. They provide two independent output voltage rails powered by 1-cell Li-Ion or 3-cell
NiMH/NiCD batteries. The devices are 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. The fixed output
voltage versions TPS62401, TPS62402, TPS62403, and TPS62404 support one pin controlled simple Dynamic
Voltage Scaling for low power processors.
The TPS6240x operates at 2.25-MHz fixed switching frequency and enters 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 1.2-mA, typical. The devices allow the use of small inductors and
capacitors to achieve a small solution size.
The TPS62400 is available in a 10-pin leadless package (3mm×3mm QFN)
VIN 2.5 V – 6 V
10 mF
TPS62404
VIN
FB 1
SW1
2.2 mH
EN_1
DEF_1
Vout1: 1.575 V
400 mA
10 mF
100
90
80
70 VOUT2 = 1.8 V
VIN = 3.6 V
60
MODE/DATA = 0
50
VOUT1= 1.575 V
EN_2
40
2.2 mH
SW2
Vout2: 3.3 V
30
600 mA
MODE/
20
DATA
10 mF
ADJ2
10
GND
0
0.01
0.1
1
10
IOUT mA
100
1000
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.
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 © 2010, Texas Instruments Incorporated