TPS6040x

Voltage range: IN to GND . . . . . . . . . . . .. .  . . . −0.3 V to 5.5 V
                        OUT to GND . . . . . . . . . . . .  . . . . . −5 V to 0.3 V
                        C_FLY− to GND . . . . . . .  . . . 0.3 V to (V_O − 0.3 V)
                        C_FLY+ to GND . . . . . . . . .. −0.3 V to (V_I + 0.3 V)
Continuous power dissipation . .   See Dissipation Rating Table
Continuous output current . . . . . . . . . . . . . . . . . .  .. . . . 80 mA
Electrostatic Discharge (Machine Model) . . . . . .. .  passed 50 V
                                     (Human Body Model) . . . .. passed 2 kV
                                     (Charged Device Model) ... passed 1 kV
Storage temperature range, T_stg . .. . . . . .. . . . .−55 to 150
Maximum junction temperature, T_J . . . . . . . . . .  . . . . . . . 150

† 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 reliability.

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 TPS6040x 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-F capacitors of TPS6040x 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.