TL5209_15 Datasheet, PDF (12/23 Pages) Texas Instruments – TL5209 500-mA Low-Noise Low-Dropout Voltage Regulator With Shutdown

TL5209
SLVS581B – SEPTEMBER 2006 – REVISED JUNE 2015
8 Detailed Description
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8.1 Overview
The TL5209 device is a low-dropout (LDO) regulator with an input voltage range from 2.5 V to 16 V and a
maximum output current of 500 mA. The output voltage can be adjusted using external resistors (R1 and R2)
and has an accuracy of 1% to 2% depending on the ambient temperature. The maximum voltage drop across the
device varies from 10 mV to 500 mV depending on the current load at the output.
8.2 Functional Block Diagram
IN
V_IN
EN
OUT
+
−
Current Limiting and
Thermal Shutdown
Bandgap
Reference
R1
ADJ/BYP
R2
GND
V_OUT
C_OUT
C_BYP
(optional)
Figure 39. Low-Noise Adjustable Regulator
8.3 Feature Description
8.3.1 Enable and Shutdown
The EN pin is CMOS-logic compatible. When EN is held high (>2 V), the regulator is active. Likewise, applying a
low signal (<0.4 V at 25°C) to EN or leaving it open shuts down the regulator. If the enable or shutdown feature
is not needed, EN should be tied to VIN.
8.4 Device Functional Modes
The table below lists the expected value of VOUT as determined by the EN pin.
EN (Control Input)
L
H
Table 1. VOUT Function Table
VOUT
Open
1.242 V × (1 + R2/R1)
12
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