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(3,25 mm x 3,25 mm) www.ti.com TPS61020, TPS61024 TPS61025, TPS61027 SLVS451A ­ SEPTEMBER 2003 ­ REVISED APRIL 2004 96% EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 1.5-A SWITCH FEATURES · 96% Efficient Synchronous Boost Converter ­ 200-mA Output Current From 0.9-V Input ­ 500-mA Output Current From 1.8-V Input Output Voltage Remains Regulated When Input Voltage Exceeds Nominal Output Voltage Device Quiescent Current: 25-µA (Typ) Input Voltage Range: 0.9-V to 6.5-V Fixed and Adjustable Output Voltage Options Up to 5.5-V Power Save Mode for Improved Efficiency at Low Output Power Low Battery Comparator Low EMI-Converter (Integrated Antiringing Switch) Load Disconnect During Shutdown Over-Temperature Protection Small 3 mm x 3 mm QFN-10 Package DESCRIPTION The TPS6102x devices provide a power supply solution for products powered by either a one-cell, two-cell, or three-cell alkaline, NiCd or NiMH, or one-cell Li-Ion or Li-polymer battery. Output currents can go as high as 200 mA while using a single-cell alkaline, and discharge it down to 0.9 V. It can also be used for generating 5 V at 500 mA from a 3.3-V rail or a Li-Ion battery. The boost converter is based on a fixed frequency, pulse-width-modulation (PWM) controller using a synchronous rectifier to obtain maximum efficiency. At low load currents the converter enters the Power Save mode to maintain a high efficiency over a wide load current range. The Power Save mode can be disabled, forcing the converter to operate at a fixed switching frequency. The maximum peak current in the boost switch is limited to a value of 1500 mA. The TPS6102x devices keep the output voltage regulated even when the input voltage exceeds the nominal output voltage. The output voltage can be programmed by an external resistor divider, or is fixed internally on the chip. The converter can be disabled to minimize battery drain. During shutdown, the load is completely disconnected from the battery. A low-EMI mode is implemented to reduce ringing and, in effect, lower radiated electromagnetic energy when the converter enters the discontinuous conduction mode. The device is packaged in a 10-pin QFN PowerPADTMpackage measuring 3 mm x 3 mm (DRC). · · · · · · · · · · · · · · · · APPLICATIONS All One-Cell, Two-Cell and Three-Cell Alkaline, NiCd or NiMH or Single-Cell Li Battery Powered Products Portable Audio Players PDAs Cellular Phones Personal Medical Products Camera White LED Flash Light L1 6.8 µH C1 10 µF R1 SW VBAT 0.9-V To 6.5-V Input EN LBI R2 PS GND VOUT R3 FB R4 R5 C2 2.2 µF C3 47 µF VO 3.3 V Up To 200 mA LBO PGND TPS61020 Low Battery Output Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PowerPAD is a trademark of Texas Instruments. PRODUCTION DATA information is current as of publication date. Products conform to specifications per th