TPS62400_07 Datasheet, PDF (1/43 Pages) Texas Instruments – 2.25MHz 400mA/600mA Dual Step-Down Converter In Small 3x3mm QFN Package

TPS62400, TPS62401
TPS62402, TPS62403
www.ti.com
SLVS681D – JUNE 2006 – REVISED FEBRUARY 2007
2.25MHz 400mA/600mA 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 400 mA and 600 mA
• Adjustable Output Voltage From 0.6V 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-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 2.5 V – 6 V
10 mF
TPS62401
VIN
FB 1
SW1
2.2 mH
EN_1
DEF_1
Vout1: 1.575 V
400 mA
10 mF
EN_2
MODE/
DATA
2.2 mH
SW2
ADJ2
GND
Vout2: 1.8 V
600 mA
10 mF
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 3.3V or 5V
voltage rail.
With an input voltage range of 2.5V to 6V the
TPS62400 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. The fixed
output voltage versions TPS62401, TPS62402,
TPS62403 support one pin controlled simple
Dynamic Voltage Scaling for low power processors.
The TPS6240x operates at 2.25MHz 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 1.2µA, 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 (3×3mm QFN)
100
90
80
70 VOUT2 = 1.8 V
VIN = 3.6 V
60
MODE/DATA = 0
50
VOUT1= 1.575 V
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 © 2006–2007, Texas Instruments Incorporated