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LM2937IMP-10 데이터시트(PDF) 11 Page - Texas Instruments

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부품명 LM2937IMP-10
상세설명  500-mA Low Dropout Regulator
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Current Limit
OVSD
(§32V)
Thermal
Shutdown
INPUT
OUTPUT
GND
LM2937
PNP
Bandgap
Reference
LM2937
www.ti.com
SNVS100F – MARCH 2000 – REVISED JULY 2014
7 Detailed Description
7.1 Overview
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.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Thermal Shutdown (TSD)
The Thermal Shutdown circuitry of the LM2937 has been designed to protect the device against temporary
thermal overload conditions. The TSD circuitry is not intended to replace proper heat-sinking. Continuously
running the LM2937 device at thermal shutdown may degrade device reliability as the junction temperature will
be exceeding the absolute maximum junction temperature rating.
7.3.2 Short Circuit Current Limit
The output current limiting circuitry of the LM2937 has been designed to limit the output current in cases where
the load impedance is unusually low. This includes situations where the output may be shorted directly to ground.
Continuous operation of the LM2937 at the current limit will typically result in the LM2937 transitioning into
Thermal Shutdown mode.
7.3.3 Overvoltage Shutdown (OVSD)
Input voltages greater than typically 32 V will cause the LM2937 output to be disabled. When operating with the
input voltage greater than the maximum recommended input voltage of 26 V the device performance is not
ensured. Continuous operation with the input voltage greater than the maximum recommended input voltage is
discouraged.
Copyright © 2000–2014, Texas Instruments Incorporated
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