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TI power management ICs extend battery life

Posted: 07 Aug 2002 ?? ?Print Version ?Bookmark and Share

Keywords:texas instruments? tps6113x? tps61130? tps6112x? tps61120?

Texas Instruments Inc. has announced the availability of three new power management devices that provide dual outputs for system and core voltages extending battery life in portable devices with 95 percent efficiency.

The TPS61130 is claimed to be the industry's first combination of a synchronous SEPIC step-up or step-down switching converter with an LDO linear regulator, while the TPS61100 and TPS61120 devices are the company's first integrated combination of synchronous step-up dc/dc converters with LDO linear regulators.

The devices can be used for systems powered by single-cell lithium and single-cell and dual-cell alkaline, NiCd and NiMH batteries. They use PWM switching to enable up to 95 percent conversion efficiency and feature a typical quiescent current of 405A.

The 4-by-4mm QFN devices also integrate switching transistors to reduce board space and simplify the design.

TPS611xx devices can be used in a wide range of portable systems needing two or more voltage rails and are suited for designs based on platforms using TI's TMS320C55x DSP, MSP430 microcontroller, or any other low power processors. Typical applications include PDAs, MP3 players, digital still cameras, wireless phones, and data networking.

The TPS6110x is designed as a cost-efficient solution for systems with one or two alkaline, NiCd, or NiMH cells. The device integrates a synchronous step-up (boost) converter generating 1.5V to 5.5V with an LDO generating 0.9V to 3.6V that can be derived either from the converter output or directly from the battery.

The boost converter provides an output current of up to 0.2A and operates with supply voltages down to 0.8V. Both outputs can be either adjusted by an external resistor or placed internally on the chip.

A second, "push-button" enabled input on the TPS6110x simplifies the design of startup circuitry to enable the device when it is in sleep mode.

The TPS6112x is designed for single-cell Li-Ion and Li-Polymer or dual-cell alkaline, NiMH, and NiCd systems. The device integrates a synchronous boost converter generating 2.5V to 5.5V with an LDO generating 0.9V to 5.5V.

The boost converter provides an output current of up to 0.4A and operates with supply voltages down to 1.8V. The device operates with either two outputs or two inputs, such as a battery and a USB supply. Alternatively, the LDO can be used to filter the output of the switching converter.

The TPS6113x is similar to the TPS6112x, except it contains an LDO with a synchronous SEPIC converter that can function as either a step-up or step-down, boost or buck converter.

The TPS6110x is initially available in a 20-pin TSSOP, and the TPS6112x and TPS6113x in 16-pin TSSOPs. Availability of a 24-pin QFN for the TPS6110x and a 16-pin QFN for the TPS6112x and TPS6113x is scheduled for Q3 2002. Suggested pricing for the TPS611xx family of devices starts at $1.75 each in quantities of 1,000 units.

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