Datasheet

LM2937-2.5, LM2937-3.3
www.ti.com SNVS015E –FEBRUARY 1998–REVISED APRIL 2013
LM2937-2.5, LM2937-3.3 400mA and 500mA Voltage Regulators
Check for Samples: LM2937-2.5, LM2937-3.3
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FEATURES
DESCRIPTION
The LM2937-2.5 and LM2937-3.3 are positive voltage
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• Fully Specified for Operation Over −40°C to
regulators capable of supplying up to 500 mA of load
+125°C
current. Both regulators are ideal for converting a
• Output Current in Excess of 500 mA (400mA
common 5V logic supply, or higher input supply
for SOT-223 package)
voltage, to the lower 2.5V and 3.3V supplies to power
VLSI ASIC's and microcontrollers. Special circuitry
• Output Trimmed for 5% Tolerance Under All
has been incorporated to minimize the quiescent
Operating Conditions
current to typically only 10 mA with a full 500 mA load
• Wide Output Capacitor ESR Range, 0.01Ω up
current when the input to output voltage differential is
to 5Ω
greater than 5V.
• Internal Short Circuit and Thermal Overload
The LM2937 requires an output bypass capacitor for
Protection
stability. As with most regulators utilizing a PNP pass
• Reverse Battery Protection
transistor, the ESR of this capacitor remains a critical
design parameter, but the LM2937-2.5 and LM2937-
• 60V Input Transient Protection
3.3 include special compensation circuitry that
• Mirror Image Insertion Protection
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.
Connection Diagrams
Figure 1. TO-220 Plastic Package Figure 2. SOT-223 Plastic Package
Front View Front View
See Package Number NDE0003B See Package Number DCY0004A
Figure 3. DDPAK/TO-263 Surface-Mount Package Figure 4. DDPAK/TO-263 Surface-Mount Package
Top View Side View
See Package Number KTT0003B See Package Number KTT0003B
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PRODUCTION DATA information is current as of publication date.
Copyright © 1998–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.