Ic Datasheet Fix — Highway 09
Highway 09 IC Datasheet: A Comprehensive Technical Breakdown
Typical Application Circuits
- CAN bus node with transceiver, termination resistor (120 Ω), and ESD protection diodes
- Sensor interface using ADC inputs with RC filtering and op-amp conditioning
- LIN slave with pull-up resistor and protection network
Part 8: Comparison with Alternative ICs
| Feature | Highway 09 | PT4115 | LM317 (as current source) | | :--- | :--- | :--- | :--- | | Topology | Linear | Buck (Switching) | Linear | | Efficiency @ 12V to 9V | ~75% (poor) | ~95% (excellent) | ~75% | | Max Current | 1.5A | 1.2A | 1.5A | | Components Needed | 3 | 6 (inductor + diode) | 2 (plus big heatsink) | | EMI Noise | None | High (requires filtering) | None | | Best For | Simple, noisy environments | Battery-powered, cool running | Lab testing, non-critical |
Verdict: Choose Highway 09 for simplicity and low EMI (key in vehicle radio/sensor systems). Choose PT4115 for efficiency and minimal heat. highway 09 ic datasheet
7. Design and Layout Guidelines
From the Highway 09 datasheet recommendations: Highway 09 IC Datasheet: A Comprehensive Technical Breakdown
- Input Capacitor: Place within 10mm of VIN pin. Use a 10µF minimum. For automotive cold-crank conditions, increase to 47µF.
- Output Capacitor: Must have an ESR less than 1Ω for stability. Ceramic X5R/X7R recommended.
- Thermal Management: For 1.5A output at a 12V-to-5V drop (7V × 1.5A = 10.5W power dissipation), a heatsink is mandatory. TO-220 version requires 5°C/W heatsink for ambient up to 40°C.
- Trace Width: For 1.5A, use 2mm (80 mil) traces with 1oz copper.
- Ground Plane: Use a solid ground plane, but avoid routing noisy switching currents under the feedback network (for adjustable version).
6. Typical Application Circuits
Part 4: Application Circuit and Design Guide
The Highway 09 shines in its simplicity. Below is the standard application circuit used in 99% of Highway 09-based modules. CAN bus node with transceiver, termination resistor (120