Highway 09 Ic Datasheet May 2026

The Highway 09 IC is a high-efficiency, low-dropout (LDO) voltage regulator with integrated overcurrent and thermal protection. While some sources may classify it under different families (e.g., logic gates or motor drivers), the most common and verified application of the Highway 09 is in DC-DC conversion with an input voltage range suitable for automotive and industrial buses.

Key Features (as per typical datasheet):

These features make the Highway 09 suitable for battery-powered equipment, automotive ECUs, and aftermarket LED drivers.

A common stumbling block for beginners is interpreting the thermal limits section of the datasheet. highway 09 ic datasheet

Internally, the Highway 09 integrates the following blocks:

A simplified internal diagram would show the input feeding the pass transistor, controlled by the error amplifier comparing a fraction of the output to the 1.25V reference. The current limit and thermal sensors directly pull the error amplifier output low during fault conditions.

The Highway 09 is a linear regulator. This means: The Highway 09 IC is a high-efficiency, low-dropout

[ P_D = (V_IN - V_LED) \times I_OUT ]

Example Calculation:

Without a heatsink, a TO-252 package has a junction-to-ambient thermal resistance (θ_JA) of ~60°C/W. At 5.4W, the junction temperature would be: ( T_J = 25°C + (5.4W \times 60°C/W) = 349°C ) → Instant destruction. These features make the Highway 09 suitable for

Solution:

The Highway 09 is designed to bridge the gap between simple linear regulators and complex switching-mode power supplies. Its primary function is to regulate current through a string of high-power LEDs with minimal external components.