The onsemi SL5504 is a highly integrated linear voltage regulator designed for precise, low-noise power supply applications in consumer, industrial, and communications systems. It is a high-voltage, low-dropout (LDO) regulator optimized for delivering stable output voltage under varying load conditions while maintaining minimal quiescent current. The device integrates features such as thermal shutdown, current limiting, and reverse voltage protection, providing robust operation in harsh environments and space-constrained designs. It supports high-precision analog and digital circuits, microcontrollers, sensors, and RF modules requiring stable supply voltage with low output noise.

## Electrical Characteristics

* Regulator Type: Linear low-dropout (LDO) voltage regulator
* Output Voltage (VOUT): 5 V nominal
* Input Voltage Range (VIN): 6 V to 40 V
* Output Current (IOUT): 0 to 500 mA continuous
* Dropout Voltage: 0.5 V typical at 500 mA load
* Quiescent Current (IQ): 2 mA typical at no load
* Load Regulation: 0.05% typical over 0–500 mA
* Line Regulation: 0.01% typical over full VIN range
* Output Voltage Tolerance: ±2% over temperature and load range
* Thermal Shutdown Threshold: 150°C typical
* Short-Circuit Current Limit: 600 mA typical

These electrical characteristics allow the SL5504 to provide high-accuracy voltage regulation suitable for sensitive analog and digital circuits, even under dynamic load conditions and wide input voltage fluctuations.

## Performance and Noise

* Output Noise: 50 μVRMS typical over 10 Hz to 100 kHz
* Power Supply Rejection Ratio (PSRR): 65 dB typical at 1 kHz
* Load Transient Response: <50 mV typical deviation for 100 mA to 500 mA step
* Start-Up Time: 1 ms typical at nominal VIN and VOUT
* Dropout Performance: Low dropout voltage allows extended battery operation in portable systems
* Fast Transient Recovery: Maintains output stability during rapid changes in load current

The low-noise, high-PSRR performance makes the device ideal for powering RF circuits, microcontrollers, analog-to-digital converters, and other precision electronics that require a clean power supply.

## Protection Features

* Thermal Shutdown: Device disables output when junction temperature exceeds 150°C, with automatic recovery
* Overcurrent Protection: Limits output current to prevent device damage during fault conditions
* Short-Circuit Protection: Internal foldback ensures safe operation during output short events
* Reverse Voltage Protection: Tolerates accidental reverse-battery connection without damage
* Output Capacitor Compatibility: Stable operation with 4.7 μF to 22 μF ceramic or low-ESR tantalum capacitors

These protection mechanisms ensure high reliability in automotive, industrial, and portable applications, preventing damage under abnormal operating conditions.

## Thermal and Mechanical Characteristics

* Package Type: TO-263 (D2PAK) or similar high-power surface-mount package
* Maximum Junction Temperature (TJ): 150°C
* Storage Temperature Range (TSTG): -65°C to +150°C
* Thermal Resistance Junction-to-Ambient (θJA): 30°C/W typical on standard PCB
* Thermal Resistance Junction-to-Case (θJC): 5°C/W typical
* Mounting: Surface-mount, compatible with automated reflow soldering

The thermal performance of the package allows continuous operation at high load currents while maintaining safe junction temperatures.

## Applications

* Power supply for microcontrollers, DSPs, and FPGAs
* RF modules and wireless communication equipment
* Industrial control systems and instrumentation
* Consumer electronics requiring low-noise, high-precision voltage
* Automotive low-voltage electronic subsystems
* Battery-powered devices where dropout voltage and efficiency are critical

The combination of high input voltage range, low dropout, low noise, and integrated protection makes the SL5504 versatile for powering a broad range of electronic devices.

## Summary

The onsemi SL5504 is a 5 V fixed, low-dropout linear regulator capable of supplying up to 500 mA of continuous current. It operates over a wide input voltage range from 6 V to 40 V, making it suitable for automotive, industrial, and consumer electronics applications. The device provides precise voltage regulation with ±2% tolerance, low output noise (50 μVRMS), and high PSRR (65 dB at 1 kHz). It features robust protection mechanisms, including thermal shutdown, overcurrent and short-circuit protection, and reverse voltage tolerance. Packaged in a TO-263 (D2PAK) surface-mount form, the SL5504 offers excellent thermal performance with θJA of 30°C/W, supporting continuous operation at high currents. Its combination of low dropout, high precision, fast transient response, and integrated protection makes it ideal for powering microcontrollers, RF modules, analog circuits, and other sensitive electronics requiring reliable, low-noise supply voltage.