LM2937_15 Datasheet, PDF (1/30 Pages) Texas Instruments – 500-mA Low Dropout Regulator

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
LM2937
SNVS100F – MARCH 2000 – REVISED JULY 2014
LM2937 500-mA Low Dropout Regulator
1 Features
•1 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 0.5 V at Full Rated
Load Current
• 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
2 Applications
• Automotive
• Industrial Control
• Point-of-Load regulation
space
space
space
Simplified Schematic
3 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 0.5 V
(1-V 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 3 V.
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 device is stable for all ESR below
3 Ω. 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 60-
V/−50-V load dump transients. Familiar regulator
features such as short circuit and thermal shutdown
protection are also built in.
PART
NUMBER
LM2937
Device Information⁽¹⁾
PACKAGE
BODY SIZE (NOM)
TO-220 (3)
SOT (4)
TO-263 (3)
14.986 mm x 10.66 mm
6.50 mm x 3.5 mm
10.18 mm x 8.41 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.