The specifications in this article are aggregated from multiple sources and represent typical values. Always test prototypes under actual operating conditions before mass production.
[ I_OUT = \fracV_SENSER_SENSE = \frac0.1VR_SENSE ]
| Pin No. | Name | Function | Description | | :--- | :--- | :--- | :--- | | 1 | | Supply Voltage | Input power pin. Bypass with a 100µF electrolytic + 0.1µF ceramic capacitor close to the IC. | | 2 | GND | Ground | Common ground for input, output, and control circuitry. The tab (heatsink) is internally connected to GND. | | 3 | OUT | Current Output | Connected to the cathode of the LED string. An external sense resistor (R_sense) is placed between OUT and GND to set the current. | Pinout Diagram (Top View, TO-252) ┌─────────┐ │ 1 VIN │ │ 2 GND │ │ 3 OUT │ │ Tab=GND│ └─────────┘ Part 3: Electrical Specifications (Typical Datasheet Values) Note: Absolute Maximum Ratings should never be exceeded, even momentarily. highway 09 ic datasheet
The output current is set by the sense resistor (R_sense) using the internal voltage reference:
When designing with this IC, remember the golden rule: . Always calculate your power dissipation, oversize your copper pours, and never assume the tab is isolated. Armed with this datasheet-equivalent guide, you can confidently integrate the Highway 09 into your next lighting project. The specifications in this article are aggregated from
[ P_D = (V_IN - V_LED) \times I_OUT ]
| Parameter | Symbol | Min | Typ | Max | Unit | | :--- | :--- | :--- | :--- | :--- | :--- | | Input Voltage | V_IN | - | - | 30 | V | | Load Dump Protection | V_IN_surge | - | - | 40 | V | | Output Current | I_OUT | 0 | 1.2 | 1.5 | A | | Current Sense Voltage | V_SENSE | 0.095 | 0.100 | 0.105 | V | | Quiescent Current (no load) | I_Q | 1 | 2 | 5 | mA | | Shutdown Current (VIN<UVLO) | I_SHDN | - | 10 | 50 | µA | | Thermal Shutdown Temp | T_SD | 140 | 150 | 160 | °C | | Thermal Hysteresis | T_HYS | - | 15 | - | °C | | Name | Function | Description | |
Introduction In the ever-evolving landscape of consumer electronics and power management, the "Highway 09" integrated circuit (IC) has emerged as a niche but critical component for specific automotive and industrial lighting applications. While the name "Highway 09" is not a formal designation by major semiconductor giants like Texas Instruments or STMicroelectronics, it is widely recognized in aftermarket automotive electronics and Chinese semiconductor catalogs as a high-voltage, constant-current LED driver .