TLE4275-Q1_15 Datasheet, PDF (12/28 Pages) Texas Instruments – TLE4275-Q1 5-V Low-Dropout Voltage Regulator

TLE4275-Q1
SLVS647I – AUGUST 2006 – REVISED NOVEMBER 2014
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9.3 Feature Description
9.3.1 Regulated Output (OUT)
The OUT terminal is the regulated 5-V output. The output has current limitation. During initial power up, the
regulator has a soft start incorporated to control the initial current through the pass element. In the event that the
regulator drops out of regulation, the output tracks the input minus a drop based on the load current.
9.3.2 Power-On-Reset (RESET)
The power-on-reset is an output with an external pull up resistor to the regulated supply. The reset output
remains low until the regulated V_O exceeds approximately 4.65 V and the power-on-reset delay has expired.
9.3.3 Reset Delay Timer (DELAY)
An external capacitor on this terminal sets the timer delay before the reset terminal is asserted high. The
constant output current charges an external capacitor until the voltage exceeds a threshold to trip an internal
comparator. The reset pulse delay time t_d, is defined with the charge time of an external capacitor DELAY.
t_d
=
C_delay ´ V_DU
I _D,c
(1)
9.4 Device Functional Modes
9.4.1 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 (I_O) and switch resistance (R_(SW)). 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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