Overview
The L5957PD, produced by STMicroelectronics, is a multifunction voltage regulator designed primarily for automotive applications, such as car radios. This integrated circuit combines multiple voltage regulators, a power switch, and various protection and monitoring functions, making it a comprehensive solution for complex power management needs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Supply Voltage 1 (Vin1) | 9 - 18 | V |
| Input Supply Voltage 2 (Vin2) | 6 - 18 | V |
| Output Voltages | 8.5 V, 5 V (permanent and switchable), 3.3 V | V |
| Output Currents | 500 mA (8.5 V), 300 mA and 800 mA (5 V), 800 mA (3.3 V) | mA |
| Power Switch Current Limit | 1 - 2 A | A |
| Operating Temperature Range | -40 to 85 | °C |
| Storage Temperature Range | -55 to 150 | °C |
| Thermal Resistance Junction-to-Case | 1.5 - 1.8 | °C/W |
| Quiescent Current in Standby | 70 µA (IGNIN = 5 V), 100 µA (VCC = 18 V) | µA |
Key Features
- Four independent voltage regulators: 8.5 V @ 500 mA, two 5 V outputs (one permanent and one switchable) @ 300 mA and 800 mA respectively, and 3.3 V @ 800 mA.
- 2 A high side driver with overcurrent limitation and short circuit protection.
- Reset function with push-pull buffer and hysteresis.
- Ignition comparator with schmitt trigger and hysteresis.
- Load dump protection and thermal shutdown.
- All pins are ESD protected.
- Very low quiescent current in standby mode.
Applications
The L5957PD is primarily designed for automotive applications, such as car radios and other in-vehicle electronic systems. It is also suitable for industrial applications where multiple regulated voltages and robust protection features are required.
Q & A
- What is the primary application of the L5957PD?
The L5957PD is primarily designed for automotive applications, such as car radios. - How many voltage regulators does the L5957PD have?
The L5957PD has four independent voltage regulators. - What are the output voltages and currents of the L5957PD?
The output voltages are 8.5 V @ 500 mA, two 5 V outputs (one permanent and one switchable) @ 300 mA and 800 mA respectively, and 3.3 V @ 800 mA. - What is the maximum operating temperature of the L5957PD?
The maximum operating temperature is 85 °C. - Does the L5957PD have overcurrent protection?
Yes, the L5957PD includes overcurrent limitation and short circuit protection. - What is the quiescent current in standby mode?
The quiescent current in standby mode is 70 µA (IGNIN = 5 V) and 100 µA (VCC = 18 V). - Is the L5957PD ESD protected?
Yes, all pins of the L5957PD are ESD protected. - What type of packages are available for the L5957PD?
The L5957PD is available in PowerSO20 (slug up) and Multiwatt15 (vertical) packages. - Does the L5957PD have thermal shutdown protection?
Yes, the L5957PD includes thermal shutdown protection. - What is the purpose of the ignition comparator in the L5957PD?
The ignition comparator is used to monitor the ignition signal and provide a stable output with hysteresis.
