SL7205
AEC-Q100 qualified 300mA LDO with 5V fixed output, wide input range up to 45V for automotive applications.
Product Overview
Description
The SL7205 is a high-performance automotive LDO designed for powering 5V systems from automotive battery voltage. The device can handle input voltages up to 45V, accommodating load dump conditions in 12V automotive systems.
With a maximum output current of 300mA and low quiescent current of 80uA typical, the SL7205 is suitable for both active operation and always-on applications. The low dropout voltage of 350mV at 300mA ensures efficient operation even at low battery voltages.
Comprehensive protection features include over-current protection, thermal shutdown, reverse polarity protection, and safe operating area protection. The device is available in thermally enhanced SOT-223 and TO-252 packages.
Product Series
SL
Primary Application
MCU Power Supply
Key Features
- High efficiency and reliability
- Optimized for industrial applications
- Comprehensive technical support
- Available from stock
Specifications
| Input Voltage Range | 4.5V - 45V |
|---|---|
| Output Voltage | 5V fixed |
| Output Current | 300mA max |
| Quiescent Current | 80uA typical |
| Dropout Voltage | 350mV at 300mA |
| Line Regulation | 0.05%/V typical |
| Load Regulation | 20mV typical |
| Temperature Range | -40°C to +125°C |
| Package | SOT-223, TO-252 |
| Qualification | AEC-Q100 Grade 1 |
Applications
MCU Power Supply
Power conversion and supply
Sensor Power
Sensor signal conditioning
Communication Modules
Communication and interface
Always-on Systems
Electronic system design
Body Control Modules
Industrial automation and control
FAE Expert Insights
"The SL7205 is my most recommended automotive LDO for 5V MCU power applications. The 45V maximum input voltage provides excellent margin for automotive load dump conditions, and the 300mA current rating covers most MCU applications with comfortable margin. The low quiescent current of 80uA is excellent for always-on applications where battery drain is a concern. I've used this LDO in numerous automotive designs and it consistently delivers reliable performance. The protection features give peace of mind for automotive applications where robustness is critical."
Automotive-grade 5V LDO with wide input range and excellent protection features
— Lisa Wang, BeiLuo
Frequently Asked Questions
What is the dropout voltage and why does it matter?
Dropout voltage is the minimum input-to-output voltage differential required for the LDO to maintain regulation. For SL7205: 350mV at 300mA load. This matters because: 1) Minimum Input Voltage - output voltage + dropout = minimum input voltage for regulation. For 5V output: 5V + 0.35V = 5.35V minimum input. 2) Battery Conditions - during cold cranking, battery voltage can drop below 6V. Low dropout ensures continued operation. 3) Efficiency - lower dropout means less power dissipation in the LDO. 4) Battery Life - less voltage headroom required extends battery life. The SL7205's 350mV dropout is excellent for automotive applications where battery voltage variations are significant.
Low dropout voltage important for automotive applications with battery voltage variations. SL7205 offers excellent dropout performance.
How do I calculate power dissipation and thermal design?
Power dissipation calculation for LDO: Pd = (Vin - Vout) × Iout + (Vin × Iq). Example: Vin = 14V, Vout = 5V, Iout = 200mA, Iq = 80uA. Pd = (14-5) × 0.2 + (14 × 0.00008) = 1.8 + 0.001 = 1.8W. Thermal design: Junction temperature TJ = TA + (Pd × θJA). For SOT-223 with θJA = 60°C/W at TA = 85°C: TJ = 85 + (1.8 × 60) = 193°C (exceeds limit). Solutions: 1) Use TO-252 package with better thermal performance, 2) Reduce input voltage if possible, 3) Reduce load current, 4) Add external heatsinking, 5) Use switching regulator for high differential applications. For high Vin-Vout differentials with high current, consider switching regulators instead of LDOs.
Calculate power dissipation and junction temperature. Use appropriate package or consider switching regulator for high differential applications.