LM2937 Datasheet, PDF (1/24 Pages) National Semiconductor (TI) – 500 mA Low Dropout Regulator

LM2937
www.ti.com
SNVS100E – MARCH 2000 – REVISED APRIL 2013
LM2937 500 mA Low Dropout Regulator
Check for Samples: LM2937
FEATURES
1
•2 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 Conditions
• Typical Dropout Voltage of 0.5V at Full Rated
Load Current
• Wide Output Capacitor ESR Range, up to 3Ω
• Internal Short Circuit and Thermal Overload
Protection
• Reverse Battery Protection
• 60V Input Transient Protection
• Mirror Image Insertion Protection
DESCRIPTION
The LM2937 is a positive voltage regulator capable of
supplying up to 500 mA of load current. The use of a
PNP power transistor provides a low dropout voltage
characteristic. With a load current of 500 mA the
minimum input to output voltage differential required
for the output to remain in regulation is typically 0.5V
(1V ensured maximum over the full operating
temperature range). 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 3V.
The LM2937 requires an output bypass capacitor for
stability. As with most low dropout regulators, the
ESR of this capacitor remains a critical design
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
See Package Number NDE0003B
Top View
Figure 2. SOT-223 Plastic Package
See Package Number DCY0004A
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
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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