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TPS60400DBVT

60mA charge pump voltage inverter, 1.6-5.5V input, PowerSave, SOT-23-5

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Manufacturer Part：

TPS60400DBVT

Package：

SOT-23-5 (DBV) (2.9 x 1.6 x 1.1 mm)

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Description

Product Overview

The TPS60400DBVT from Texas Instruments is an unregulated 60mA charge pump voltage inverter that generates a negative output voltage from a positive input ranging from 1.6V to 5.5V. Requiring only three small 1uF ceramic capacitors, it provides a compact and efficient solution for generating negative supply rails. The TPS60400 variant features a PowerSave mode that improves efficiency at low output currents. It is housed in a 5-pin SOT-23 package suitable for space-constrained applications.

Key Specifications

Input Voltage 1.6V to 5.5V
Output Current Up to 60mA
Output Voltage -VIN (unregulated inverted output)
Quiescent Current 65uA typical
PowerSave Mode Yes (TPS60400 variant)
External Capacitors 3 x 1uF ceramic
Output Resistance 12 Ohm typical
Operating Temperature -40 to 85°C
Package SOT-23-5 (DBV)
Packaging Tape & Reel

Features

  • Inverts input supply voltage to generate negative rail
  • PowerSave mode for improved efficiency at low output currents
  • Only three 1uF ceramic capacitors required
  • Integrated active Schottky diode for start-up into load
  • Wide input voltage range: 1.6V to 5.5V
  • Low quiescent current: 65uA typical
  • Complete inverter fits in 50mm2 board area
  • Small 5-pin SOT-23 package

Applications

  • LCD bias voltage generation
  • GaAs RF power amplifier bias
  • Portable instrument sensor supply
  • Bipolar op-amp negative rail generation
  • Medical instrument power supplies

The TPS60400DBVT from Texas Instruments is a charge pump voltage inverter that efficiently generates a negative output voltage from a positive input supply. Requiring only three small 1uF ceramic capacitors, it provides the simplest possible solution for generating a negative rail in battery-powered and portable systems. The PowerSave mode (specific to the TPS60400 variant within the TPS6040x family) reduces switching frequency at light loads, significantly improving efficiency when the output current demand is low. The integrated active Schottky diode eliminates the external diode typically needed for start-up into a load, further reducing component count and board space.

The TPS60400 uses a switched-capacitor charge pump to invert the input voltage. The circuit operates in two phases per switching cycle. During the charge phase, an internal flying capacitor (CFLY, external 1uF) is connected between VIN and GND, charging it to approximately VIN. During the transfer phase, CFLY is reconnected with its positive terminal to GND and negative terminal to the output, transferring charge to the output capacitor (COUT, external 1uF). This produces a negative voltage at the output, approximately -VIN plus the voltage drop across the switch resistance (approximately 12 Ohm typical). The TPS60400’s PowerSave mode monitors the output voltage and reduces the switching frequency when the output is lightly loaded, maintaining regulation while minimizing quiescent current. The input bypass capacitor (CIN, external 1uF) decouples the switching transients from the source supply.

Pin Name Type Function
1 OUT Output Negative output voltage
2 IN Power Input supply (1.6-5.5V)
3 CFLY+ Flying Cap Flying capacitor positive terminal
4 GND Ground Ground reference
5 CFLY- Flying Cap Flying capacitor negative terminal
  • LCD display bias voltage generation for portable devices
  • RF GaAs power amplifier negative gate bias supply
  • Bipolar operational amplifier negative rail from single battery
  • Medical instrument sensor bias requiring dual-rail supply
  • Audio amplifier split-rail supply from single Li-Ion cell
Manufacturer Part Number Package Notes
TI TPS60401DBVT SOT-23-5 Fixed 20kHz frequency, no PowerSave
TI TPS60402DBVT SOT-23-5 Fixed 50kHz frequency variant
TI LM27761 WSON-8 Regulated -5V output, 250mA, low noise
ADI ADM660 SOIC-8 50mA, 1.5-5.5V, inverter/doubler
Microchip TC7662B SOIC-8 20mA, 1.5-15V, voltage inverter
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Contact Information

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Contact Information

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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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