TL720M05-Q1_16 Datasheet, PDF (9/25 Pages) Texas Instruments – Low-Dropout Voltage Regulator

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8 Detailed Description
TL720M05-Q1
SGLS380H – SEPTEMBER 2008 – REVISED JULY 2015
8.1 Overview
The TL720M05-Q1 device is a monolithic integrated low-dropout voltage regulator offered in a 3-pin TO package.
The device regulates an input voltage up to 45 V to VOUT = 5 V (typical) with 2% tolerance. The device can
drive loads up to 450 mA and is short-circuit proof. At overtemperature, the incorporated temperature protection
turns off the device.
8.2 Functional Block Diagram
Temperature
Sensor
IN
Bandgap
Reference
Saturation
Control and
Protection
Circuit
OUT
GND
8.3 Feature Description
8.3.1 Regulated Output (OUT)
The OUT terminal is the regulated 5-V output. The control amplifier compares a reference voltage to a voltage
that is proportional to the output voltage and drives the base of the series transistor through a buffer. Saturation
control as a function of the load current prevents any oversaturation of the power element. The output has
current limitation. In the event that the regulator drops out of regulation, the output tracks the input minus a drop
based on the load current.
8.4 Device Functional Modes
8.4.1 Low-Voltage Tracking
At low input voltages, the regulator drops out of regulation and the output voltage tracks input minus a voltage
based on the load current and switch resistance. This allows for a smaller input capacitor and can possibly
eliminate the need of using a boost convertor during cold-crank conditions.
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