Features: ` 96% Efficient Synchronous Boost Converter
` Output Voltage Remains Regulated When Input Voltage Exceeds Nominal Output Voltage
` Device Quiescent Current: 25 A (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 ´ 3 mm QFN-10 PackageApplication· 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 LightPinout
SpecificationsInput voltage range on SW, VOUT, LBO, VBAT, PS, EN, FB, LBI 0.3 V to 7 V
Operating virtual junction temperature range, TJ 40 to 150
Storage temperature range, Tstg 65 to 150
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliabilitiy.
DescriptionThe TPS61020 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. TPS61020 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 TPS61020 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 800 mA, 1500 mA or 1800mA depending on the TPS61020 version.
The TPS61020 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 TPS61020 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 TPS61020 is packaged in a 10-pin QFN PowerPAD™ package measuring 3 mm x 3 mm (DRC).
TPS61020 Data Sheet
