LM2937-2.5_15 Datasheet, PDF (1/27 Pages) Texas Instruments – LM2937 2.5-V and 3.3-V 400-mA and 500-mA Voltage Regulators

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LM2937-2.5, LM2937-3.3
SNVS015F – FEBRUARY 1998 – REVISED NOVEMBER 2014
LM2937 2.5-V and 3.3-V 400-mA and 500-mA Voltage Regulators
1 Features
•1 Operating Input Voltage Range : 4.75 V to 26 V
• Fully Specified for Operation Over −40°C to 125°C
• Output Current in Excess of 500 mA (400 mA for
SOT-223 package)
• Output Trimmed for 5% Tolerance Under All
Operating Conditions
• Wide Output Capacitor ESR Range, 0.01 Ω up to
5Ω
• Internal Short Circuit and Thermal Overload
Protection
• Reverse Battery Input Protection
• 60-V Input Transient Protection
2 Applications
• Automotive
• Industrial Control
• Point-of-Load Regulation
Simplified Schematic
3 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 5-V logic supply, or higher input supply
voltage, to the lower 2.5-V and 3.3-V supplies to
power very-large-scale integrations (VLSI) ASICs 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 5 V.
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 5 Ω. 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 +60
V/−50 V load dump transients. Familiar regulator
features such as short circuit and thermal shutdown
protection are also built in.
* Required if the regulator is located more than 3
inches from the power supply filter capacitors.
** Required for stability. C_OUT must be at least 10 µF
(over full expected operating temperature range)
and located as close as possible to the regulator.
The equivalent series resistance, ESR, of this
capacitor may be as high as 3 Ω.
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
0.18 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.