The TPS798xx-Q1 is the first device in a line of 50-V high-voltage micropower low-dropout (LDO) linear regulators. This device is capable of supplying 50-mA output current with a dropout voltage of only 300 mV. Designed for low quiescent current high voltage (50 V) applications, 40 µA operating and 1 µA in shutdown makes the TPS798xx-Q1 an ideal choice for battery-powered or high-voltage systems. Quiescent current is also well-controlled in dropout.
Other features of the TPS798xx-Q1 include the ability to operate with low equivalent series resistance (ESR) ceramic output capacitors. This device is stable with only 1 µF on the output; most older devices require from 10-µF to 100-µF tantalum capacitors for stability. Small ceramic capacitors can be used without the necessary addition of ESR, as is common with other regulators. Internal protection circuitry includes reverse input-battery protection, reverse output current protection, current limiting, and thermal limiting to protect the device in various fault conditions.
This device is available in a fixed output voltage of 5 V (TPS79850) and with an adjustable output voltage with a 1.275-V reference voltage (TPS79801). The TPS798xx-Q1 regulator is available in a 8-pin MSOP-PowerPAD (DGN) package with an exposed pad for enhanced thermal management capability.
| Output options | Adjustable Output, Fixed Output |
| Iout (max) (A) | 0.05 |
| Vin (max) (V) | 50 |
| Vin (min) (V) | 3 |
| Vout (max) (V) | 28 |
| Vout (min) (V) | 1.275 |
| Fixed output options (V) | 5 |
| Noise (µVrms) | 100 |
| Iq (typ) (mA) | 0.04 |
| Thermal resistance θJA (°C/W) | 57 |
| Rating | Automotive |
| Load capacitance (min) (µF) | 1 |
| Regulated outputs (#) | 1 |
| Features | Enable, Reverse Current Protection, Reverse voltage protection, Short-to-battery protection |
| Accuracy (%) | 3 |
| PSRR at 100 KHz (dB) | 36 |
| Dropout voltage (Vdo) (typ) (mV) | 300 |
| Operating temperature range (°C) | -40 to 125 |
| HVSSOP (DGN) | 8 | 14.7 mm² 3 x 4.9 |
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