Overview
The LM5121MHE/NOPB is a synchronous boost controller produced by Texas Instruments, designed for high-efficiency, high-power boost regulator applications. This controller utilizes peak current mode control, providing inherent line feed-forward, cycle-by-cycle current limiting, and ease of loop compensation. It is particularly suited for applications requiring a wide input voltage range, from 3V to 65V, and output voltages up to 100V. The LM5121 is AEC-Q100 qualified, making it suitable for automotive and other demanding environments.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 3 to 65 | V |
| Output Voltage Range | 3 to 100 | V |
| Maximum Output Current | 20 | A |
| Switching Frequency Range | 50 kHz to 1 MHz | kHz |
| Operating Temperature Range | -40 to 125 | °C |
| Package Type | HTSSOP (20 pins) | |
| Package Dimensions | 6.5 mm x 4.4 mm x 1 mm | |
| ESD Rating (HBM) | ±2 kV | |
| ESD Rating (CDM) | ±1 kV | |
| Quiescent Current (Typical) | 4 mA | |
| Shutdown Quiescent Current | 9 μA |
Key Features
- AEC-Q100 Qualified for automotive applications
- Peak current mode control with cycle-by-cycle current limiting
- Programmable switching frequency up to 1 MHz
- Robust integrated 3-A gate drivers with adaptive dead-time control
- User-selectable diode emulation mode for improved efficiency at light loads
- Disconnection switch control for true shutdown and inrush current limiting
- Thermal shutdown, frequency synchronization, and hiccup mode current limit
- Programmable line undervoltage lockout (UVLO) and soft-start
- Supports external VCC bias supply option
- Circuit breaker function and hiccup mode short circuit/overload protection
- Capable of input transient suppression and reverse battery protection
Applications
The LM5121MHE/NOPB is suitable for a variety of high-power boost regulator applications, including:
- Automotive systems requiring high efficiency and robustness against transients
- Battery-powered systems needing higher output voltages
- Industrial power supplies where wide input voltage ranges are necessary
- Renewable energy systems, such as solar or wind power
- High-power LED lighting systems
Q & A
- What is the input voltage range of the LM5121MHE/NOPB?
The input voltage range is from 3V to 65V, with a minimum startup voltage of 4.5V. - What is the maximum output voltage of the LM5121MHE/NOPB?
The maximum output voltage is up to 100V. - What is the switching frequency range of the LM5121MHE/NOPB?
The switching frequency is programmable from 50 kHz to 1 MHz. - What type of control method does the LM5121MHE/NOPB use?
The LM5121MHE/NOPB uses peak current mode control. - Is the LM5121MHE/NOPB AEC-Q100 qualified?
Yes, the LM5121MHE/NOPB is AEC-Q100 qualified, making it suitable for automotive applications. - What are the key features of the disconnection switch control in the LM5121MHE/NOPB?
The disconnection switch control provides true shutdown, inrush current limiting, and circuit breaker functions. - What is the quiescent current of the LM5121MHE/NOPB in shutdown mode?
The shutdown quiescent current is 9 μA. - Can the LM5121MHE/NOPB operate in diode emulation mode?
Yes, the LM5121MHE/NOPB supports a user-selectable diode emulation mode for improved efficiency at light loads. - What are the ESD ratings for the LM5121MHE/NOPB?
The ESD ratings are ±2 kV for HBM and ±1 kV for CDM. - What is the operating temperature range of the LM5121MHE/NOPB?
The operating temperature range is from -40°C to 125°C.
