SNVS015E – FEBRUARY 1998 – REVISED APRIL 2013
LM2937-2.5, LM2937-3.3 400mA and 500mA Voltage Regulators
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FEATURES
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Fully Specified for Operation Over
−40°C
to
+125°C
Output Current in Excess of 500 mA (400mA
for SOT-223 package)
Output Trimmed for 5% Tolerance Under All
Operating Conditions
Wide Output Capacitor ESR Range, 0.01Ω up
to 5Ω
Internal Short Circuit and Thermal Overload
Protection
Reverse Battery Protection
60V Input Transient Protection
Mirror Image Insertion Protection
DESCRIPTION
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 5V logic supply, or higher input supply
voltage, to the lower 2.5V and 3.3V supplies to power
VLSI ASIC's 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 5V.
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 5Ω. 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
+60V/−50V load dump transients. Familiar regulator
features such as short circuit and thermal shutdown
protection are also built in.
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Connection Diagrams
Figure 1. TO-220 Plastic Package
Front View
See Package Number NDE0003B
Figure 2. SOT-223 Plastic Package
Front View
See Package Number DCY0004A
Figure 3. DDPAK/TO-263 Surface-Mount Package
Top View
See Package Number KTT0003B
Figure 4. DDPAK/TO-263 Surface-Mount Package
Side View
See Package Number KTT0003B
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Copyright © 1998–2013, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
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