UTC LM2937-XX LINEAR INTEGRATED CIRCUIT
500mA LOW DROPOUT VOLTAGE
REGULATOR
DESCRIPTION
The UTC LM2937-XX is a positive voltage regulator
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capable of supplying up to 500mA of load current. The use of
a PNP power transistor provides a low dropout voltage
characteristic. With a load current of 500mA the minimum
input to output voltage differential required for the output to
remain in regulation is typically 0.5V(1V guaranteed maximum
over the full operating temperature range). Special circuitry
has been incorporated to minimize the quiescent current to
typically only 10mA with a full 500mA load current when the
input to output voltage differential is greater than 3V.
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The UTC LM2937-XX 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 UTC LM2937-XX is stable for
all ESR below 3Ω.This allows the use of low ESR chip
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1:Input 2:GND 3:Output
capacitors.
Ideally suited for automotive applications, the UTC
LM2937-XX 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.
FEATURES
*Fully specified for operation over -40°C to +125°C
*Output current in excess of 500mA
*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
*Reverse battery protection
*Internal short circuit and thermal overload protection
*60V input transient protection
*Mirror image insertion protection
UTC UNISONIC TECHNOLOGIES CO., LTD.
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QW-R102-012,A