Datasheet

User's Guide
SLVU320 – August 2009
Using the TPS65001EVM 2.25 MHz Step-Down Converter
with Dual LDO
The TPS65001 is a single chip Power Management ICs for portable applications. The device combines a
single step-down converter with two low dropout regulators and a Supply Voltage Supervisor (SVS). The
step-down converter enters 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. The step-down converter allows the use of a small inductor and capacitors to achieve a small
solution size. The step-down converter has Power Good status output that can be used for sequencing.
The LDOs are capable of supplying 300mA and can operate with an input voltage range between 1.6V
and 6.0V, allowing them to be supplied from the step-down converter or directly from the main battery.
The step-down converter and the LDOs have separate voltage inputs and enables, allowing for design
and sequencing flexibility.
Contents
1 Introduction ................................................................................................................... 2
1.1 Applications .......................................................................................................... 2
1.2 Features .............................................................................................................. 2
2 TPS65001 EVM Electrical Performance Specifications ................................................................ 3
3 Schematic ..................................................................................................................... 4
4 Connector and Test Point Description .................................................................................... 5
4.1 JP1 –ENLDO1....................................................................................................... 5
4.2 JP2 – ENLDO2 ...................................................................................................... 5
4.3 JP3 –MODE ......................................................................................................... 5
4.4 JP4 –ENDCDC ...................................................................................................... 5
4.5 JP5 – MRPU ......................................................................................................... 5
4.6 JP6 – VPU ........................................................................................................... 5
4.7 JP7 – RSTSNSIN ................................................................................................... 5
4.8 J1 – PG/GND ........................................................................................................ 5
4.9 J2 – VODC / GND .................................................................................................. 6
4.10 J3 – VIN/GND ....................................................................................................... 6
4.11 J4 – RST/GND ...................................................................................................... 6
4.12 J5 – VINLDO2 ....................................................................................................... 6
4.13 J6 – VLDO2 ......................................................................................................... 6
4.14 J7 – VLDO1/GND ................................................................................................... 6
4.15 J8 – VINLDO1 ....................................................................................................... 6
5 4 TPS65000/1 Typical Performance Data and Characteristic Curves ................................................ 6
5.1 Efficiency ............................................................................................................. 7
5.2 Line and Load Regulation ......................................................................................... 7
5.3 Output Voltage Ripple .............................................................................................. 9
5.4 Startup Timing ..................................................................................................... 10
6 EVM Assembly Drawings and Layout ................................................................................... 11
7 List of Materials ............................................................................................................. 14
List of Figures
1 TPS65001EVM Schematic ................................................................................................. 4
2 TPS65000/1 Efficiency vs Load Current .................................................................................. 7
3 TPS65000/1 DCDC Converter Load Transient Response ............................................................. 7
SLVU320 – August 2009 Using the TPS65001EVM 2.25 MHz Step-Down Converter with Dual LDO 1
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