The OPTIREG™ linear TLF4477-3LA is a monolithic integrated dual channel low drop out voltage regulator capable of supplying loads up to 300 mA.

The adjustable output voltage makes the TLF4477-3LA capable of supplying the majority of standard active antennas such as:
• FM/AM
• DAB
• XM
• SIRIUS

For an input voltage up to 40 V the TLF4477-3LA provides an adjustable output voltage ranging from 3 V up to 20 V in a thermally enhanced PG-TSON-14 package.
The channel specific current monitors of the TLF4477-3LA provide access to unique diagnostic and protection features. They measure the output currents and translate them to a proportional voltage at the current sense output CSOx.
The output current limits for each channel can be manually set via an external resistor. Overtemperature, overcurrent and output overvoltage fault conditions can be detected as an analogue voltage level at the current sense output CSOx above the current sensing range.
Separate digital status pins ST1 and ST2 for each channel can indicate the presence of one or multiple of the aforementioned faults.
The outputs of the device can be disabled independently via the enable signals on EN1 and EN2 to reduce power consumption. The CSOxSel selects the channel monitored at the CSOx pin. CSOxSel can also set the monitor pin CSOx into a high impedance state. This allows the CSOx signals of multiple devices to be monitored by a single ADC connected.

• Infotainment active antenna power supply
• Surround view camera power supply
• Automotive applications that are permanently connected to the battery