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New TI Inductor-Free Charge Pump Dramatically Reduces Board Space for White LED Backlights in Portable Applications

Tiny 1-mm Tall Converter Operates in Buck and Boost Modes

Jul 8, 2003

DALLAS (July 8, 2003) - Texas Instruments Incorporated (TI) extends its popular REG710x family of switched-capacitor buck-boost converters by introducing a 1-mm high device in a ThinSOT-23 package. The tiny converter supports 30 mA of output current for white light emitting diode (LED) backlights and liquid crystal displays (LCDs) in single-cell lithium-ion (Li-Ion) powered mobile applications such as cell phones, electronic games, handheld meters and portable medical equipment (See: power.ti.com/sc03138).

The REG71055 buck-boost converter maintains a fixed output voltage of 5.5 V across input voltages from 3.0 V to 5.5 V to drive white LEDs in one-cell Li-Ion applications. Further saving power and battery life, the device features a quiescent current of typically 65 uA.
Designed to reduce system size and cost, TI's REG710x series of converters automatically steps the input voltage up or down to maintain the specified output of 2.5 V, 2.7 V, 3 V, 3.3 V, 5 V or 5.5 V, eliminating the need to combine a boost converter and low drop-out-voltage (LDO) regulator to perform the same task. The REG710x converters, which do not require any inductors, employ a 1-MHz switching frequency using ceramic capacitors, eliminating the need for expensive tantalum capacitors. The devices include over-temperature and over-current protection and automatically limit in-rush current to protect the system and further suppress electromagnetic interference while maintaining design simplicity.

Available Today at power.ti.com

The REG71055 is available in volume today in a 1-mm high, six-pin, 3 mm x 3 mm ThinSOT-23 package. Suggested resale pricing is $0.90 each in quantities of 1,000. Evaluation modules for TI´s REG710x converters are available in less than 24 hours through power.ti.com.