TPS65055 Datasheet, PDF (1/39 Pages) Texas Instruments – 2.25 MHz Dual Step-Down Converter With 4 Low Input Voltage LDOs

TPS65055
www.ti.com.......................................................................................................................................................................................... SLVS844 – SEPTEMBER 2008
2.25 MHz Dual Step-Down Converter With 4 Low Input Voltage LDOs
FEATURES
1
•2 Up to 95% Efficiency
• Output Current for DCDC Converters 2 × 0.6A
• Two Selectable Fixed Output Voltages 1.0
V/1.2 V for DCDC2
• V_IN Range for DCDC Converters From 2.5 V to
6V
• 2.25 MHz Fixed Frequency Operation
• Power Save Mode at Light Load Current
• 180° Out of Phase Operation
• Output Voltage Accuracy in PWM Mode ±1%
• Low Ripple PFM Mode
• Total Typ. 32 µA Quiescent Current for Both
DCDC Converters
• 100% Duty Cycle for Lowest Dropout
• 2 General Purpose 400 mA- High PSRR LDOs
• 2 General Purpose 200 mA- High PSRR LDOs
• V_IN Range for LDOs from 1.5 V to 6.5 V
• Digital Voltage Selection for the LDOs
• I²C Compatible Interface
• Available in a 4 mm × 4 mm 32-Pin QFN
Package
APPLICATIONS
• Cell Phones, Smart-phones
• WLAN
• PDAs, Pocket PCs
• OMAP™ and Low Power DSP Supply
• XScale
• Portable Media Players
• Digital Cameras
DESCRIPTION
The TPS65055 is an integrated Power Management
IC for applications powered by one Li-Ion or
Li-Polymer cell, which require multiple power rails.
The TPS65055 provides two highly efficient,
2.25 MHz step-down converters targeted at providing
the core voltage and I/O voltage in a processor-based
system. Both step-down converters enter a low power
mode at light load for maximum efficiency across the
widest possible range of load currents.
For low noise applications the device can be forced
into fixed frequency PWM mode using the I²C
compatible interface. In shutdown mode, current
consumption is reduced to less than 1 µA.
The device allows the use of small inductors and
capacitors to achieve a small solution size.
The TPS65055 provides an output current of up to
0.6 A on each dcdc converter.
The TPS65055 also integrates two 400 mA LDO and
two 200 mA LDO voltage regulators, which can be
turned on/off using separate enable pins on each
LDO. Each LDO operates with an input voltage range
between 1.5 V and 6.5 V allowing them to be
supplied from one of the step-down converters or
directly from the main battery. Two digital input pins
are used to set the output voltage of the LDOs from a
set of 9 different combinations for LDO1 to LDO4.
Additionally, the converters can be controlled by an
I²C compatible interface.
The TPS65055 is available in a small 32-pin leadless
package (4 mm × 4 mm QFN) with a 0,4 mm pitch.
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.
OMAP, PowerPAD are trademarks of Texas Instruments.
2
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 © 2008, Texas Instruments Incorporated