TLE4309 Datasheet, PDF (1/12 Pages) Infineon Technologies AG – Adjustable Linear Low Dropout LED Driver

Adjustable Linear Low Dropout LED Driver
TLE4309
Features
• Adjustable constant current up to 500 mA
• Operating supply voltage range 4.5 V to 24 V
• Maximum supply voltage up to 45 V
• Low dropout voltage
• PWM / ENABLE input
• << 1 µA quiescent current when disabled
• Overtemperature protection
• Short circuit proof
• Reverse polarity protection
• Operating junction temperature range: -40 °C to 150 °C
• Suitable for applications up to 85 °C ambient temperature.
• Green Product (RoHS compliant)
PG-TO263-7
Functional Description
The TLE4309 is an integrated adjustable constant current source for driving loads up to
500 mA. The output current level can be adjusted with an external shunt resistor.
Supplying high power LEDs with the TLE4309 ensures constant brightness independent
from supply voltage or LED forward voltage spread. Therefore, LED lifetime is extended
by protecting from overcurrent and overtemperature
The PWM/EN input permits LED brightness regulation by pulse width modulation.
Setting the pin to “low” switches off the IC entirely. Due to the high impedance of the
PWM/EN input, the TLE4309 can be used as a protected high side switch.
Protection circuits prevent from damage to the IC in case of overload, short circuit, and
reverse polarity. A chip temperature monitoring circuit shuts off the power stage and
prevents the IC from destruction under fault conditions.
In case of negative input voltage, a leakage current is flowing only from the output to the
input, hence the LED are protected against reverse supply. Input voltage peaks up to
45 V are absorbed by the IC, preventing the LEDs from overcurrent.
The TLE4309G is provided in the surface mounted PG-TO-263 package with excellent
thermal resistance.
Type
TLE4309G
Datasheet
Package
PG-TO263-7-1
1
Marking
TLE4309
Rev. 1.0, 2007-03-20