text.skipToContent text.skipToNavigation


400mA and 500mA Voltage Regulator


Package | PIN: TO-263 (KTT) | 3
Temp: Q (-40 to 125)
Carrier: Cut Tape
Qty Price
1-9 $1.83
10-24 $1.64
25-99 $1.53
100-249 $1.33
250-499 $1.23
500-749 $1.03
750-999 $0.84
1000+ $0.77


  • Fully Specified for Operation Over −40°C
    to 125°C
  • Output Current in Excess of 500 mA
  • Output Trimmed for 5% Tolerance Under all Operating
  • Typical Dropout Voltage of 0.5 V at Full Rated Load
  • Wide Output Capacitor ESR Range, up to 3 Ω
  • Internal Short Circuit and Thermal Overload Protection
  • Reverse Battery Protection
  • 60-V Input Transient Protection
  • Mirror Image Insertion Protection

Texas Instruments  LM2937ESX-3.3/NOPB

The LM2937-2.5 and LM2937-3.3 are positive voltage regulators capable of supplying up to 500 mA of load current. Both regulators are ideal for converting a common 5-V logic supply, or higher input supply voltage, to the lower 2.5-V and 3.3-V supplies to power very-large-scale integrations (VLSI) ASICs and microcontrollers. Special circuitry has been incorporated to minimize the quiescent current to typically only 10 mA with a full 500-mA load current when the input to output voltage differential is greater than 5 V.

The LM2937 requires an output bypass capacitor for stability. As with most regulators utilizing a PNP pass transistor, the ESR of this capacitor remains a critical design parameter, but the LM2937-2.5 and LM2937-3.3 include special compensation circuitry that relaxes ESR requirements. The LM2937 is stable for all ESR ratings less than 5 Ω. This allows the use of low ESR chip capacitors.

The regulators are also suited for automotive applications, with built in protection from reverse battery connections, two-battery jumps and up to +60 V/−50 V load dump transients. Familiar regulator features such as short circuit and thermal shutdown protection are also built in.