L9758 - Automotive Dual Voltage Regulator | STMicroelectronics
MPN: L9758 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.28 | $228.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.85 | $1,850.00 |
Drop-in alternatives for L9758 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
L9758TR
β Drop-Inπ Reference alternative (not in catalog)
TLE4267
β Drop-Inπ Reference alternative (not in catalog)
MC33269
β Drop-Inπ Reference alternative (not in catalog)
L9758 Maximum Ratings & Electrical Characteristics
| Number of Outputs | 2 |
| Output Voltage 1 | 5 V |
| Output Voltage 2 | 3.3 V |
| Output Current per Channel | 400 mA |
| Input Voltage Range | 5.5 V to 18 V |
| Dropout Voltage | 0.5 V at 400 mA |
| Output Voltage Tolerance | Β±2% |
| Quiescent Current | 80 uA |
| Line Regulation | 10 mV |
| Load Regulation | 20 mV |
| Operating Temperature Range | -40C to +125C |
| Package | PowerSO-20 |
| Mounting Type | Surface Mount |
| AEC-Q100 Qualified | Yes |
| RoHS Compliant | Yes |
| Enable Pin | Yes (2 pins) |
| Thermal Shutdown | Yes |
| Overcurrent Protection | Yes |
L9758 Pin Configuration
| Pin 1 | EN1 β Enable for regulator 1 (active high) |
| Pin 2 | IN1 β Input supply for regulator 1 |
| Pin 3 | GND β Ground |
| Pin 4 | OUT1 β Output of regulator 1 (5V) |
| Pin 5 | NC β No connect |
| Pin 6 | NC β No connect |
| Pin 7 | OUT2 β Output of regulator 2 (3.3V) |
| Pin 8 | GND β Ground |
| Pin 9 | IN2 β Input supply for regulator 2 |
| Pin 10 | EN2 β Enable for regulator 2 (active high) |
| Pin 11 | NC β No connect |
| Pin 12 | NC β No connect |
| Pin 13 | NC β No connect |
| Pin 14 | NC β No connect |
| Pin 15 | NC β No connect |
| Pin 16 | NC β No connect |
| Pin 17 | NC β No connect |
| Pin 18 | NC β No connect |
| Pin 19 | NC β No connect |
| Pin 20 | NC β No connect |
| Pin 21 | PAD β Exposed pad (thermal and ground) |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
L9758 is suitable for 6 applications: Engine Control Unit (ECU), Transmission Control Module, Body Control Module, Sensor Power Supply, Infotainment System, Advanced Driver Assistance Systems (ADAS).
Engine Control Unit (ECU)
The L9758 provides clean 5V and 3.3V rails for the microcontroller and sensors in an ECU. Its wide input voltage range (5.5V to 18V) handles battery voltage variations during cranking, while the low dropout voltage ensures stable operation even when the battery voltage dips. The AEC-Q100 qualification guarantees reliability in harsh automotive environments. In a typical ECU, the L9758 is placed after the main power supply, with 10uF capacitors on input and outputs to ensure stability. The enable pins allow power sequencing to prevent latch-up in mixed-voltage systems. Compared to discrete regulators, the L9758 reduces component count and PCB area, improving overall system reliability.
Recommended
Transmission Control Module
In transmission control modules, the L9758 supplies regulated power to the transmission control unit and its sensors. The dual outputs provide separate rails for digital and analog circuits, reducing noise coupling. The overcurrent and thermal shutdown protection safeguard the module against faults. The PowerSO-20 package with exposed pad allows efficient heat dissipation, essential for under-hood applications. The L9758's low quiescent current helps minimize battery drain when the vehicle is off. In a typical design, the L9758 is powered from the ignition switch, with the enable pins controlled by the main microcontroller for sequenced startup.
Recommended
Body Control Module
The L9758 is used in body control modules to power the central microcontroller and peripheral interfaces. Its 5V output can power logic circuits, while the 3.3V output is suitable for low-voltage sensors and communication interfaces. The wide input range accommodates load dump transients, and the AEC-Q100 qualification ensures long-term reliability. The device's small footprint and integrated protection features simplify PCB design. In a body control module, the L9758 is often placed near the battery input, with reverse battery protection diodes and input filtering capacitors. The enable pins can be used to implement sleep modes, reducing power consumption when the vehicle is parked.
Recommended
Sensor Power Supply
The L9758 provides stable power to various automotive sensors, such as pressure, temperature, and position sensors. The low output noise and tight regulation (Β±2%) ensure accurate sensor readings. The dual outputs allow powering multiple sensors with different voltage requirements. The device's thermal shutdown and overcurrent protection prevent damage from sensor faults. In a sensor module, the L9758 is typically powered from the vehicle's 12V rail, with a 10uF capacitor on the input and 1uF capacitors on the outputs. The enable pins can be used to power down sensors when not in use, saving energy.
Recommended
Infotainment System
In infotainment systems, the L9758 provides clean power for the main processor and audio codec. The 5V rail can power the processor's I/O, while the 3.3V rail powers the memory and logic. The low dropout voltage ensures stable operation even when the battery voltage drops during audio playback. The device's low noise output is critical for audio quality. The L9758 is typically placed after a buck converter, with additional filtering capacitors to minimize ripple. The enable pins allow the system to enter low-power standby mode when the ignition is off.
Recommended
Advanced Driver Assistance Systems (ADAS)
The L9758 is used in ADAS modules to power the vision processor and sensor interface. The dual outputs provide separate rails for digital and analog circuits, reducing interference. The wide input voltage range handles voltage transients from the vehicle's electrical system. The AEC-Q100 qualification ensures reliability in safety-critical applications. In an ADAS module, the L9758 is often powered from a protected battery line, with input filtering and reverse protection. The enable pins can be used to implement fail-safe power sequencing, ensuring the processor starts up correctly.
Recommended
Recommended Products Summary
Engineering reference data for L9758 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L9758TR | TLE4267 | MC33269 |
|---|---|---|---|---|
| Package | PowerSO-20 | PowerSO-20 | PowerSO-20 | PowerSO-20 |
| Brand | STMicroelectronics | STMicroelectronics | Infineon | onsemi |
| Output Voltage 1 | 5V | 5V | 5V | 5V |
| Output Voltage 2 | 3.3V | 3.3V | 3.3V | 3.3V |
| Output Current per Channel | 400mA | 400mA | 400mA | 500mA |
| Input Voltage Range | 5.5V to 18V | 5.5V to 18V | 5.5V to 18V | 5.5V to 18V |
| Dropout Voltage | 0.5V | 0.5V | 0.5V | 0.5V |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes |
Key Differentiators
- Dual LDO with 5V and 3.3V outputs in one package (vs TLE4267)
- AEC-Q100 qualified for automotive (vs MC33269)
- Low quiescent current of 80uA per regulator (vs TLE4267)
Design Notes
The L9758 in PowerSO-20 package has a thermal resistance of 40C/W (theta_JA). At maximum load (400mA on each output) with 12V input and 5V/3.3V outputs, power dissipation is approximately 2.6W, resulting in a junction temperature rise of 104C. Ensure adequate copper area on the PCB and consider a heatsink or forced airflow for high ambient temperatures.
Place input and output capacitors as close to the pins as possible. Use 10uF ceramic capacitors on each input and output. Add a 0.1uF ceramic capacitor in parallel for high-frequency decoupling. The exposed pad should be soldered to a large ground plane to improve thermal performance.
Do not exceed the maximum input voltage of 18V. Ensure the enable pins are properly driven; floating enable pins may cause unpredictable behavior. Use pull-down resistors on the enable pins if they are not driven by a microcontroller. Also, verify that the output capacitors have sufficient ESR to maintain stability.
Compliance Information
RoHS compliant and AEC-Q100 qualified per STMicroelectronics product page. Halogen-free status not specified in available data.
