Datasheet

LM2937
www.ti.com SNVS100E –MARCH 2000–REVISED APRIL 2013
LM2937 500 mA Low Dropout Regulator
Check for Samples: LM2937
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FEATURES
DESCRIPTION
The LM2937 is a positive voltage regulator capable of
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• Fully Specified for Operation Over −40°C to
supplying up to 500 mA of load current. The use of a
+125°C
PNP power transistor provides a low dropout voltage
• Output Current in Excess of 500 mA
characteristic. With a load current of 500 mA the
• Output Trimmed for 5% Tolerance Under all
minimum input to output voltage differential required
for the output to remain in regulation is typically 0.5V
Operating Conditions
(1V ensured maximum over the full operating
• Typical Dropout Voltage of 0.5V at Full Rated
temperature range). Special circuitry has been
Load Current
incorporated to minimize the quiescent current to
• Wide Output Capacitor ESR Range, up to 3Ω
typically only 10 mA with a full 500 mA load current
when the input to output voltage differential is greater
• Internal Short Circuit and Thermal Overload
than 3V.
Protection
• Reverse Battery Protection
The LM2937 requires an output bypass capacitor for
stability. As with most low dropout regulators, the
• 60V Input Transient Protection
ESR of this capacitor remains a critical design
• Mirror Image Insertion Protection
parameter, but the LM2937 includes special
compensation circuitry that relaxes ESR
requirements. The LM2937 is stable for all ESR
below 3Ω. This allows the use of low ESR chip
capacitors.
Ideally suited for automotive applications, the LM2937
will protect itself and any load circuitry from reverse
battery connections, two-battery jumps and up to
+60V/−50V load dump transients. Familiar regulator
features such as short circuit and thermal shutdown
protection are also built in.
Connection Diagrams
Front View Front View
Figure 1. TO-220 Plastic Package Figure 2. SOT-223 Plastic Package
See Package Number NDE0003B See Package Number DCY0004A
Top View Side View
Figure 3. DDPAK/TO-263 Surface-Mount Package Figure 4. DDPAK/TO-263 Surface-Mount Package
See Package Number KTT0003B See Package Number KTT0003B
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Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.