The LM5121MHE/NOPB is a synchronous boost controller intended for high-efficiency, high-power boost regulator applications. The control method is based upon peak current mode control. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation.
The switching frequency is programmable up to 1 MHz. Higher efficiency is achieved using two robust N-channel MOSFET gate drivers with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions.
The LM5121MHE/NOPB provides disconnection switch control which completely disconnects the output from the input during an output short or a shutdown condition. During start-up sequence, inrush current is limited by the disconnection switch control.
An internal charge pump allows 100% duty cycle operation of the high-side synchronous switch (Bypass operation). Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line undervoltage lockout.
Feature
- AEC-Q100 Qualified with the following results:
- Device Temperature Grade 1: –40°C to +125°C
Ambient Operating Temperature Range - Device HBM ESD Classification Level 2
- Device CDM ESD Classification Level C6
- Device Temperature Grade 1: –40°C to +125°C
- Maximum Input Voltage: 65 V
- Min Input Voltage: 3.0 V (4.5 V for startup)
- Output Voltage Up to 100 V
- Bypass (VOUT = VIN) Operation
- 1.2-V Reference with ±1.0% Accuracy
- Free-Run/Synchronizable up to 1 MHz
- Peak Current Mode Control
- Robust Integrated 3-A Gate Drivers
- Adaptive Dead-Time Control
- Optional Diode Emulation Mode
- Programmable Cycle-by-Cycle Current Limit
- Programmable Line UVLO
- Programmable Soft-Start
- Thermal Shutdown Protection
- Low Shutdown Quiescent Current: 9 μA
- Programmable Slope Compensation
- Programmable Skip Cycle Mode Reduces
Standby Power - Supports External VCC Bias Supply Option
- Load Disconnection in Shutdown Mode (True
Shutdown) - Inrush Current Limiting
- Hiccup Mode Short Circuit/Overload Protection
- Circuit Breaker Function
- Capable of Input Transient Suppression
- Capable of Reverse Battery Protection
- Thermally Enhanced 20-Pin HTSSOP
