TPS798-Q1 50 mA, 3 V to 50 V, Micropower, Low-Dropout Linear Regulator |

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50 mA, 3 V to 50 V, Micropower, Low-Dropout Linear Regulator



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.


  • Qualified for Automotive Applications
  • Wide Input Voltage Range: 3 V to 50 V
  • Low Quiescent Current: 40 µA (Typical)
  • Low Dropout Voltage: 300 mV (Typical)
  • Output Current: 50 mA
  • No Input Protection Diodes Needed
  • Adjustable Output From 1.275 V to 28 V
  • 1-µA Quiescent Current in Shutdown
  • Stable With 1-µF Output Capacitor
  • Stable With Aluminum, Tantalum, or Ceramic
  • Reverse Input-Battery Protection
  • Reverse Output Current Flow Protection
  • Thermal Limiting
  • Available in an 8-Pin MSOP-PowerPAD IC


Thermal calculator

Estimate the LDO IC temperature at your design conditions:
Part number
Vin  V
Vout  V
Iout  A
Ambient temp  °C
Package option
Voltage option
PCB construction
Enhanced Thermal = single thermal spreading plane of 1 oz Cu
Minimum Thermal = single thermal spreading plane of 1/2 oz Cu
View the user guide for more details.

Junction temperature vs. PCB copper coverage area
These are estimated power dissipation and thermal results.
Care must be taken to ensure that device junction temperature
does not exeed the maximum ratings as indicated in the datasheet.

This calculator uses the PCB copper area to estimate the device junction temperature. See notes on usage and calculation method.


Compare all products in Linear regulators (LDO) Email Download to Excel
Part number Order Output options Iout (Max) (A) Vin (Max) (V) Vin (Min) (V) Vout (Max) (V) Vout (Min) (V) Fixed output options (V) Package Group Features Regulated outputs (#) Operating temperature range (C) Thermal resistance θJA (°C/W) TI functional safety category Noise (uVrms) Approx. price (US$) Rating PSRR @ 100 KHz (dB) Accuracy (%) Dropout voltage (Vdo) (Typ) (mV) Iq (Typ) (mA) Package size: mm2:W x L (PKG)
TPS798-Q1 Order now Adjustable Output
Fixed Output    
0.05     50     3     28     1.275     5     HVSSOP | 8     Enable
Reverse Current Protection
Reverse Voltage Protection    
1     -40 to 125     57       100     0.81 | 1ku     Automotive     36     3     300     0.04     8HVSSOP: 15 mm2: 4.9 x 3 (HVSSOP | 8)    
LM2936Q-Q1 Order now Fixed Output     0.05     60     5.5     5     3     3
SOIC | 8
SOT-223 | 4
TO-252 | 3
VSSOP | 8    
Reverse Voltage Protection     1     -40 to 125     51       500     0.73 | 1ku     Automotive     35     4     200     0.015     8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
4SOT-223: 46 mm2: 7 x 6.5 (SOT-223 | 4)
3TO-252: 40 mm2: 6.1 x 6.58 (TO-252 | 3)
8VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 8)    
TPS7A16-Q1 Order now Adjustable Output
Fixed Output    
0.1     60     3     18.5     1.2     3.3
HVSSOP | 8     Enable
Power Good    
1     -40 to 125     66       215     1.24 | 1ku     Automotive     26     2     60     0.005     8HVSSOP: 15 mm2: 4.9 x 3 (HVSSOP | 8)    
TPS7A16A-Q1 Order now Adjustable Output
Fixed Output    
0.1     60     3