TPS65070 - Powering Processors with a Single IC

Texas Instruments' TPS65070 is a single chip power management IC for portable applications consisting of a battery charger with power path management for a single Li-Ion or Li-Polymer cell. The charger can either be supplied by a USB port on pin USB or by a DC voltage from a wall adapter connected to pin AC. Three highly efficient 2.25 MHz step-down converters are targeted at providing the core voltage, memory and I/O voltage in a processor based system. The step-down converters enter a low power mode at light load for maximum efficiency across the widest possible range of load currents.

Overview

For low noise applications the device can be forced into fixed frequency PWM using the I²C interface. The step-down converters allow the use of small inductors and capacitors to achieve a small solution size. The TPS65070 also integrates two general purpose LDOs for an output current of 200 mA. These LDOs can be used to power an SD-card interface and an always-on rail, but can be used for other purposes as well. Each LDO operates with an input voltage range between 1.8 V and 6.3 V allowing them to be supplied from one of the step-down converters or directly from the main battery. An inductive boost converter with two programmable current sinks powers two strings of white LEDs.

The TPS65070 comes in a 48-pin leadless package (6 mm x 6 mm QFN) with a 0.4 mm pitch.

Functional Block Diagram