LM1085IS-ADJ Voltage Regulator for Avalon 1246 1346 Hashboard Chip
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LM1085IS-ADJ Adjustable Voltage Regulator | 3A Linear LDO for Avalonminer 1246 / 1346 Hashboard Repair
The LM1085IS-ADJ is a 3A adjustable-output linear voltage regulator used on the Avalonminer 1246 and 1346 hashboards for auxiliary-rail generation. The "ADJ" suffix denotes the adjustable-output variant — output voltage is set by an external resistor divider, typically configured for 3.3V on the Avalon hashboard application.
Headline specs: 1.5V maximum dropout voltage at 3A load, current-limit protection, thermal-shutdown protection, line regulation 0.015% typical, load regulation 0.1% typical. The Zener-adjusted bandgap reference gives tight output accuracy across temperature.
When to Replace the LM1085IS-ADJ
- Avalon 1246 / 1346 auxiliary rail dead while input voltage is present at the regulator input.
- Output drooping under load — regulator can't sustain the 3A spec.
- Thermal shutdown trips repeatedly — internal thermal protection responding to chip failure.
- Visible damage on the package — burnt or cracked.
LM1085IS-ADJ Specifications
| Feature | Specification |
|---|---|
| Type | Adjustable Linear Voltage Regulator |
| Output Voltage | Adjustable (typically 3.3V on Avalon 1246/1346) |
| Output Current | 3A |
| Maximum Dropout Voltage | 1.5V at 3A load |
| Line Regulation | 0.015% typical |
| Load Regulation | 0.1% typical |
| Protections | Current limit + thermal shutdown |
| Reference | Zener-adjusted bandgap |
| Application | Avalonminer 1246 / 1346 hashboard auxiliary rail |
FAQ — LM1085IS-ADJ Regulator
Q: How do I confirm the regulator is the failed part?
A: Measure VIN at the input pin — should be at least 1.5V above the target output. Measure VOUT — should match the rail target (typically 3.3V on Avalon). If VIN is good but VOUT is 0V or way off, the regulator is failed.
Q: What output voltage is set by the divider on Avalon 1246/1346?
A: Typically 3.3V on these boards. Output = 1.25V × (1 + R2/R1) using standard LDO feedback divider math. If you're changing the rail target, swap R2 to retune.
Q: Rework profile?
A: LM1085IS-ADJ typically ships in TO-263 (D2PAK) SMD or TO-220 through-hole. Match the original package. SMD uses standard 250°C reflow with PowerPAD thermal contact; through-hole uses vacuum desoldering pump.
Q: Bulk pricing?
A: Yes — email contact@lys-sz.com for tray-quantity pricing.
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Avalon 1246 / 1346 repair benches stocking LM1085IS-ADJ regulators in volume? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.
Buying in bulk for a mining farm or repair shop?
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