Overview
The LM51551QDSSRQ1 is a 2.2-MHz wide input range, non-synchronous boost, SEPIC, and flyback controller produced by Texas Instruments. This device is part of the LM5155x-Q1 family and is AEC-Q100 qualified for automotive applications, ensuring reliability and performance in harsh environments. It features a strong 1.5-A peak standard MOSFET driver and supports external VCC supply to enhance efficiency. The controller is designed to minimize AM band interference and crosstalk, making it suitable for a variety of power management applications.
Key Specifications
| Parameter | Description |
|---|---|
| Manufacturer | Texas Instruments |
| Package Type | 12-WSON (3x2) with Wettable Flank |
| Mounting Type | Surface Mount |
| Frequency | 100 kHz ~ 2.2 MHz |
| Function | Step-Up, Step-Up/Step-Down |
| Topology | Boost, Flyback, SEPIC |
| Input Voltage Range | 2.97V ~ 45V |
| Operating Temperature | -40°C ~ 150°C (TJ) |
| Output Configuration | Positive |
| Output Type | Transistor Driver |
| Duty Cycle (Max) | 93% |
| Current Limit Threshold | 100 mV |
| Hiccup Mode Protection | Enabled |
Key Features
- Strong 1.5-A Peak MOSFET Driver: Supports external VCC supply to improve efficiency.
- Programmable Switching Frequency: From 100 kHz to 2.2 MHz to avoid AM band interference and crosstalk.
- Integrated Protection Features: Includes cycle-by-cycle current limit, overvoltage protection, line UVLO, thermal shutdown, and hiccup mode overload protection.
- Programmable Soft Start and Slope Compensation: Enhances startup and stability.
- Precision Reference and Power-Good Indicator: Provides accurate feedback and status indication.
- External Clock Synchronization: Allows for synchronized operation with other devices.
- Low Shutdown IQ and Pulse-Skipping Operation: Improves efficiency at light loads.
Applications
- Automotive Start-Stop Systems: Suitable for automotive applications due to its AEC-Q100 qualification.
- High Voltage LiDAR Power Supply: Supports high voltage requirements for LiDAR systems.
- Multiple-Output Flyback Without Optocoupler: Can be used in flyback configurations without the need for an optocoupler.
- Automotive Rear-Lights LED Bias Supply: Ideal for LED lighting in automotive rear-lights.
- Wide Input Boost, SEPIC, Flyback Power Modules: Versatile in various power module configurations.
- Portable Speaker Applications: Suitable for battery-powered boost, SEPIC, and flyback power supplies in portable speakers.
Q & A
- What is the input voltage range of the LM51551QDSSRQ1?
The input voltage range is from 2.97V to 45V.
- What are the supported topologies for the LM51551QDSSRQ1?
The device supports Boost, Flyback, and SEPIC topologies.
- Does the LM51551QDSSRQ1 have hiccup mode protection?
Yes, the LM51551QDSSRQ1 has hiccup mode overload protection enabled.
- What is the maximum duty cycle of the LM51551QDSSRQ1?
The maximum duty cycle is 93%.
- Can the LM51551QDSSRQ1 be synchronized with an external clock?
Yes, the device supports external clock synchronization.
- What is the operating temperature range of the LM51551QDSSRQ1?
The operating temperature range is from -40°C to 150°C (TJ).
- What is the peak current limit threshold of the LM51551QDSSRQ1?
The peak current limit threshold is 100 mV.
- Does the LM51551QDSSRQ1 have a power-good indicator?
Yes, the device includes a power-good indicator.
- What is the package type of the LM51551QDSSRQ1?
The package type is 12-WSON (3x2) with Wettable Flank.
- Is the LM51551QDSSRQ1 AEC-Q100 qualified?
Yes, the device is AEC-Q100 qualified for automotive applications.
