LM317MDT-TR
Manufacturer
Model
LM317MDT-TR
Category
The LM317MDT-TR is a 500mA adjustable LDO with robust thermal protection and 80dB PSRR, suitable for consumer electronics and embedded systems requiring stable regulated voltage in the 1.2V~37V range. Optimal thermal management and proper PCB layout are critical for reliable operation.
Reference Pricing
Reference Stock
Specifications
| Dropout Voltage | 40V |
| Load Regulation | 0.01% |
| Operating Temperature Range | LM317: 0~70℃; LM317A: -40~85℃ |
| Output Current | 1.5A |
| Output Noise | 0.003% |
| Output Voltage Accuracy | ±1.25% |
| Output Voltage Adjustment Rate | 0.01%/V |
| PSRR | 65dB |
| Package Type | TO-252-2(DPAK) |
| Rated Voltage | Not specified |
| Transient Response Time | Not specified |
Function And Role
Core Function
Adjustable positive low-dropout (LDO) voltage regulator
Key Characteristics
- 500mA output current
- 80dB power supply rejection ratio (PSRR) at 120Hz
- Adjustable output voltage (1.2V~37V)
- Overheat and short-circuit protection
- TO-252-2 (DPAK) package
- Operating temperature range 0°C~125°C
Application Domains
Basic Scenarios
- Consumer electronics power supply
- Battery-powered devices
- DC-DC conversion in embedded systems
Extended Scenarios
- Medical devices requiring stable voltage
- Industrial control systems
- Solar power systems with voltage regulation
Precautions
| Soldering | Use proper reflow soldering techniques for TO-252 packages |
| Current Limit | Max continuous current 500mA (instantaneous up to 1A) |
| Voltage Limit | Input voltage ≤40V, output ≤37V |
| Thermal Management | Thermal resistance 50°C/W; require heat sink for >1W operation |
| Storage | Store in dry environment below 85% RH |
| Risk Warnings |
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Alternative Model Params
- Output current range
- Voltage adjustment resolution
- PSRR performance
- Thermal protection thresholds
- Package compatibility
Design Recommendations
| Layout | Keep input/output traces short and decouple with 0.1µF capacitors |
| Thermal | Use thermal vias or copper pours for heat dissipation |
| Compatibility | Verify input voltage compatibility with input capacitor ratings |
| Testing | Test output stability under varying loads and temperatures |
Market Positioning
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| Weaknesses |
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