description
The TPS6040x is a family of devices that generate an unregulated negative output voltage from an input voltage ranging from 1.6 V to 5.5 V. The devices are typically supplied by a preregulated supply rail of 5 V or 3.3 V. Due to its wide input voltage range, two or three NiCd, NiMH, or alkaline battery cells, as well as one Li-Ion cell can also power them.
Only three external 1-µF capacitors are required to build a complete dc/dc charge pump inverter. Assembled in a 5-pin SOT23 package, the complete converter can be built on a 50-mm2 board area. Additional board area and component count reduction is achieved by replacing the Schottky diode that is typically needed for start-up into load by integrated circuitry.
The TPS6040x can deliver a maximum output current of 60 mA with a typical conversion efficiency of greater than 90% over a wide output current range. Three device options with 20-kHz, 50-kHz, and 250-kHz fixed frequency operation are available. One device comes with a variable switching frequency to reduce operating current in applications with a wide load range and enables the design with low-value capacitors.
characteristic
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Qualified for Automotive Applications
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Inverts Input Supply Voltage
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Up to 60-mA Output Current
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Only Three Small 1-µF Ceramic Capacitors Needed
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Input Voltage Range From 1.6 V to 5.5 V
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PowerSave-Mode for Improved Efficiency at Low Output Currents (TPS60400)
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Device Quiescent Current Typical 100 µA
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Integrated Active Schottky-Diode for Start-Up Into Load
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Small 5-Pin SOT23 Package
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Evaluation Module Available TPS60400EVM-178
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applications
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LCD Bias
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GaAs Bias for RF Power Amps
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Sensor Supply in Portable Instruments
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Bipolar Amplifier Supply