New Product Introduction

Infineon TLF4949SJ

TLF4949 from Infineon - Monolithic integrated 5V voltage regulator

Infineon TLF4949SJ voltage regulator - top side

The TLF4949 is a monolithic integrated 5V voltage regulator with a very low dropout output and additional functions as under voltage reset with power-on reset delay and input voltage sense. It is designed to supply microcontroller controlled systems especially in automotive applications.



  • Operating DC Supply Voltage Range 5 V to 28 V
  • Transient Supply Voltage up to 40 V
  • Extremely low Quiescent Current in Standby Mode
  • High Precision Standby Output Voltage 5 V ±1%
  • Output Current Capability up to 100 mA
  • Very low Dropout Voltage less than 0.5 V
  • Reset Circuit sensing the Output Voltage
  • Programmable Reset Pulse Delay with External Capacitor
  • Voltage Sense Comparator
  • Thermal Shutdown and Short Circuit Protections
  • Suitable for Use in Automotive Electronics
  • Green Product (RoHS)
  • AEC Qualified



  • Cost effective voltage regulator with reset and early warning
  • Compatible with 4949 variants
  • High reset immunity



  • Automotive voltage regulator for microcontroller


Block diagram

Infineons TLF4949SJ block diagram



Parametrics TLF4949SJ
Accuracy 2.0 %
Budgetary Price €/1k 0.27
Dropout Voltage 500 mV
Early Warning yes
Enable (=Inhibit) no
Hold no
Operating Temperature min / max -40.0 °C / 125.0 °C
Operating Voltage min / max 5.5 V / 28.0 V
Output Current max 100.0 mA
Output Voltage Type 5.0 V
Over Voltage Protection no
Power Fail no
Power Good no
Qualification Automotive
Quiescent Current 180 µA
Regulator Type General Purpose
Reset yes
Status Output no
Watchdog no


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