TPS61121PW

The TPS61121PW from Texas Instruments is a synchronous boost converter featuring an integrated LDO for post-regulation, providing a complete power supply solution for battery-powered devices. It supports an input voltage range of 1.8 V to 5.5 V and can deliver up to 500 mA of output current from the boost stage, with the integrated LDO capable of supplying 200 mA.

The device utilizes a fixed-frequency, pulse-width-modulation (PWM) controller with synchronous rectification for high efficiency, reaching up to 95%. The boost converter's peak switch current is limited to 1600 mA. It includes features like power-save mode for improved efficiency at low output power and a low-battery comparator.

Designed for applications such as MP-3 players, PDAs, and other portable equipment, the TPS61121PW is available in a 16-TSSOP package. The converter can be disabled to minimize battery drain, and the load is completely disconnected from the battery during shutdown. A low-EMI mode is implemented to reduce radiated electromagnetic energy.

This IC is suitable for single-cell Li-Ion or Li-Polymer battery applications, as well as two- to four-cell Alkaline, NiCd, or NiMH batteries. It can generate stable output voltages that are either adjustable via an external resistor divider or fixed internally.