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 mm 2 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.
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 100
Integrated Active Schottky-Diode for
Start-Up Into Load
Small 5-Pin SOT23 Package
Evaluation Module Available
TPS60400EVM–178
Applications
LCD Bias
GaAs Bias for RF Power Amps
Sensor Supply in Portable Instruments
Bipolar Amplifier Supply
Medical Instruments
Battery-Operated Equipment
DBV PACKAGE (TOP VIEW)
typical application circuit
TPS60400 OUTPUT VOLTAGE vs INPUT VOLTAGE
APPLICATION INFORMATION
TPS60400 as a High-Efficiency Rail Splitter
P/N Package
TPS60400DBV SOT23-5
TPS60401DBV SOT23-5
TPS60402DBV SOT23-5
TPS60403DBV SOT23-5
