Overview
The L5957 is a multifunction voltage regulator produced by STMicroelectronics. It is designed to meet the demanding requirements of automotive applications, particularly in car radio systems. The IC integrates a triple voltage regulator and a power switch, along with a monitoring circuit for detection. It features a very low quiescent current in standby mode, making it energy-efficient and reliable for use in various automotive electronics.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Supply Voltage 1 (Vin1) | 9 - 18 | V |
| Input Supply Voltage 2 (Vin2) | 6 - 18 | V |
| Output Voltages | 8.5V @ 500mA, 5V @ 300mA, 5V @ 800mA, 3.3V @ 800mA | |
| Quiescent Current (Standby) | 70 μA (IGNIN = 5V), 100 μA (VCC = 18V) | μA |
| Operating Temperature Range | -40 to 85 | °C |
| Storage Temperature Range | -55 to 150 | °C |
| Junction Temperature Range | -55 to 150 | °C |
| Thermal Resistance (Junction-to-Case) | 1.5 - 1.8 | °C/W |
| Power Dissipation (Tcase = 85°C) | 43 | W |
| Load Dump Protection | Up to 22V | V |
| Dropout Voltage | 1.5 | V |
| Line Regulation | 50 mV | mV |
| Load Regulation | 100 mV | mV |
Key Features
- Overcurrent limitation
- Thermal shutdown
- Four outputs: 8.5V @ 500mA, 5V @ 300mA (permanent), 5V @ 800mA, 3.3V @ 800mA
- Reset function
- 2 A high side driver
- Load dump protection
- All pins ESD protected
- Ignition comparator
Applications
The L5957 is primarily designed for use in automotive electronics, particularly in car radio systems and other automotive applications that require multiple regulated voltage outputs. Its robust features such as load dump protection, thermal shutdown, and overcurrent limitation make it suitable for harsh automotive environments.
Q & A
- What is the L5957?
The L5957 is a multifunction voltage regulator produced by STMicroelectronics, designed for automotive applications. - What are the output voltages of the L5957?
The L5957 provides four output voltages: 8.5V @ 500mA, 5V @ 300mA (permanent), 5V @ 800mA, and 3.3V @ 800mA. - What is the quiescent current in standby mode?
The quiescent current in standby mode is 70 μA (IGNIN = 5V) and 100 μA (VCC = 18V). - What is the operating temperature range of the L5957?
The operating temperature range is -40 to 85°C. - Does the L5957 have load dump protection?
Yes, the L5957 has load dump protection up to 22V. - What is the thermal resistance (junction-to-case) of the L5957?
The thermal resistance (junction-to-case) is 1.5 - 1.8 °C/W. - Is the L5957 ESD protected?
Yes, all pins of the L5957 are ESD protected. - What is the maximum power dissipation of the L5957 at Tcase = 85°C?
The maximum power dissipation is 43 W. - Does the L5957 have a reset function?
Yes, the L5957 includes a reset function. - What is the dropout voltage of the L5957?
The dropout voltage is 1.5 V.
