Overview
The LM5122MHE/NOPB is a multi-phase capable synchronous boost controller designed by Texas Instruments. This controller is intended for high-efficiency synchronous boost regulator applications. It features a wide input voltage range of 3 V to 65 V and can produce output voltages up to 100 V. The LM5122 uses peak-current-mode control, which provides inherent line feedforward, cycle-by-cycle current limiting, and ease of loop compensation. The device is highly integrated, including robust N-channel MOSFET gate drivers with adaptive dead-time control, and supports switching frequencies up to 1 MHz, either free-running or synchronized to an external clock.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Voltage (VIN) | 3 V (4.5 V for Start-Up) | - | 65 V | V |
| Output Voltage (VOUT) | - | - | 100 V | V |
| Switching Frequency | - | - | 1 MHz | Hz |
| Gate Driver Current (Peak) | - | - | 3 A | A |
| Shutdown Quiescent Current | 9 | - | 17 | μA |
| Junction Temperature | -40 | - | 125 | °C |
| Thermal Shutdown Temperature | - | - | 165 | °C |
| Package Type | - | - | 20 or 24-Pin HTSSOP | - |
Key Features
- Wide input voltage range: 3 V to 65 V
- Output voltage up to 100 V
- Bypass operation (VOUT = VIN)
- 1.2-V reference with ±1% accuracy
- Free-run and synchronizable switching up to 1 MHz
- Peak-current-mode control
- Robust 3-A integrated gate drivers with adaptive dead-time control
- Optional diode-emulation mode
- Programmable cycle-by-cycle current limit
- Hiccup-mode overload protection
- Programmable line undervoltage lockout (UVLO)
- Programmable soft start
- Thermal shutdown protection
- Low shutdown quiescent current: 9 μA
- Programmable slope compensation
- Programmable skip-cycle mode reduces standby power
- Allows external VCC supply
- Inductor DCR current sensing capability
- Multi-phase capability
- Thermally enhanced 20 or 24-Pin HTSSOP package
Applications
- 12-V, 24-V, and 48-V power systems
- Automotive start-stop systems
- Audio power supplies
- High-current boost power supplies
Q & A
- What is the input voltage range of the LM5122?
The input voltage range of the LM5122 is from 3 V to 65 V, with a minimum start-up voltage of 4.5 V.
- What is the maximum output voltage the LM5122 can produce?
The LM5122 can produce output voltages up to 100 V.
- What is the switching frequency range of the LM5122?
The switching frequency of the LM5122 can be programmed up to 1 MHz.
- What type of control method does the LM5122 use?
The LM5122 uses peak-current-mode control.
- Does the LM5122 support multi-phase operation?
Yes, the LM5122 supports multi-phase operation with a 180° phase-shifted clock output.
- What is the shutdown quiescent current of the LM5122?
The shutdown quiescent current of the LM5122 is 9 μA.
- What is the thermal shutdown temperature of the LM5122?
The thermal shutdown temperature of the LM5122 is typically 165°C.
- What package types are available for the LM5122?
The LM5122 is available in 20 or 24-Pin HTSSOP packages.
- Does the LM5122 support external VCC supply?
Yes, the LM5122 allows for an external VCC supply.
- What are some common applications of the LM5122?
Common applications include 12-V, 24-V, and 48-V power systems, automotive start-stop systems, audio power supplies, and high-current boost power supplies.
