Overview
The L5963DN-EHT, produced by STMicroelectronics, is a dual monolithic switching regulator designed specifically for automotive applications. This IC integrates two step-down synchronous switching voltage regulators with internal power switches, a low drop-out linear regulator (LDO), and a high side driver. It is tailored to meet the stringent requirements of the automotive sector, including load dump protection and a wide input voltage range.
The device can operate directly from the vehicle battery and features adjustable voltage detectors and voltage supervisors. The regulators can work in free-run condition or synchronize to an external clock, reducing AM and FM interferences and allowing the use of small, low-cost inductors and capacitors.
Key Specifications
| Parameter | Value |
|---|---|
| Input Voltage Range | 3.5 V to 26 V |
| Switching Frequency | 250 kHz (free-run), 250 kHz to 2 MHz (synchronization range) |
| Minimum Output Voltage | 1 V |
| Load Current | Up to 3.0 A |
| LDO Maximum Current | 250 mA |
| Operating Temperature Range | -40°C to 85°C |
| Package | PowerSSO 36 |
| Grade | Automotive |
| RoHS Compliance | Ecopack2 |
Key Features
- AEC-Q100 qualified for automotive applications
- Two step-down synchronous switching voltage regulators with internal power switches
- Internal high-side and low-side NDMOS
- Integrated soft-start and independent hardware enable pins
- 180° PWM output phase shift between the two DC/DC regulators
- Programmable switching frequency divider by 1, 2, 4, or 8
- Power good function and adjustable voltage detector outputs
- One standby/linear regulator with backup function
- High side driver with 0.5 V max drop at 0.5 A
- Protection against short to ground, battery, loss of ground, and unsupplied short to battery
- Programmable under-voltage battery detector and independent thermal protection on all regulators
- Extremely low quiescent current in standby conditions (25 μA typical)
Applications
The L5963DN-EHT is specifically designed for automotive applications where reliability, load dump protection, and a wide input voltage range are critical. It is suitable for various automotive systems that require robust power management, including infotainment systems, driver assistance systems, and other vehicle electronics.
Q & A
- What is the input voltage range of the L5963DN-EHT?
The input voltage range is from 3.5 V to 26 V.
- What is the maximum load current for each DC/DC regulator?
The maximum load current is up to 3.0 A.
- What is the operating temperature range of the L5963DN-EHT?
The operating temperature range is from -40°C to 85°C.
- Does the L5963DN-EHT have built-in protection features?
Yes, it has protection against short to ground, battery, loss of ground, and unsupplied short to battery, as well as independent thermal protection on all regulators.
- Can the switching frequency be synchronized?
Yes, the DC/DC regulators can synchronize to an external clock within a range of 250 kHz to 2 MHz.
- What is the quiescent current in standby conditions?
The quiescent current in standby conditions is typically 25 μA.
- Is the L5963DN-EHT AEC-Q100 qualified?
Yes, it is AEC-Q100 qualified for automotive applications.
- What package options are available for the L5963DN-EHT?
The device is available in the PowerSSO 36 package.
- Does the L5963DN-EHT have a high side driver?
Yes, it includes a high side driver with a maximum drop of 0.5 V at 0.5 A.
- Can the output voltage be programmed?
Yes, the output voltage can be programmed using an external resistor divider.
