The TPS6040x-Q1 family of devices generate an unregulated negative output voltage from an input voltage ranging from 1.8 V to 5.25 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 SOT-23 package, the complete converter can be built on a 50-mm2 board area. Replacing the Schottky diode typically needed for start-up into load with integrated circuitry can achieve additional board area and component count reduction.
The TPS6040x-Q1 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 TPS60401/2/3-Q1 with 20-kHz, 50-kHz, and 250-kHz fixed frequency operation are available. TPS60400-Q1 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.
| Vin (min) (V) | 1.8 |
| Vin (max) (V) | 5.25 |
| Vout (min) (V) | -1.8 |
| Vout (max) (V) | -5.25 |
| Iout (max) (A) | 0.06 |
| Regulated outputs (#) | 1 |
| Switching frequency (min) (kHz) | 20 |
| Switching frequency (max) (kHz) | 20 |
| Iq (typ) (mA) | 0.065 |
| Features | Adjustable current limit |
| Operating temperature range (°C) | -40 to 125 |
| Rating | Automotive |
| Type | Charge pump |
| SOT-23 (DBV) | 5 | 8.12 mm² 2.9 x 2.8 |
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