TPS60400DBVR

1 features

•     Inverts Input Supply Voltage

•     Up to 60-mA Output Current

• 
  Only Three Small 1-µF Ceramic Capacitors Needed

• 
  Input Voltage Range From 1.6 V to 5.5 V

• 
  PowerSave-Mode for Improved Efficiency at Low Output Currents (TPS60400)

• 
  Device Quiescent Current Typical 65 µA

• 
  Integrated Active Schottky-Diode for Start-Up Into Load

• 
  Small 5-Pin SOT23 Package

• 
  Evaluation Module Ava

2 applications

• 
  LCD Bias

• 
  GaAs Bias for RF Power Amps

• 
  Sensor Supply in Portable Instruments

• 
  Bipolar Amplifier Supply

• 
  Medical Instruments

• 
  Battery-Operated Equipment

3 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.

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