Overview
The LM25122-Q1 is a wide-input range synchronous boost controller designed by Texas Instruments. It is intended for high-efficiency synchronous boost regulator applications. The controller uses peak current mode control, which provides inherent line feed-forward and ease of loop compensation. It features robust high-side and low-side N-channel MOSFET drivers with adaptive dead-time control. The switching frequency is programmable up to 600 kHz and can be synchronized to an external clock. The device also supports multi-phase configuration with a 180º phase shifted clock output.
The LM25122-Q1 is AEC-Q100 qualified, ensuring it meets automotive standards with a device temperature grade of -40°C to +125°C. It includes various protection features such as thermal shutdown, hiccup mode over load protection, and remote shutdown capability.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Supply Voltage (VIN) | 4.5 | - | 42 | V |
| Output Voltage | - | - | 50 | V |
| Switching Frequency (fSW) | 400 | 450 | 500 | kHz |
| Junction Temperature (TJ) | -40 | - | 125 | °C |
| Shutdown Current (ISHUTDOWN) | 9 | 17 | - | μA |
| VCC Regulation (VCC(REG)) | 6.9 | 7.6 | 8.3 | V |
| SYNCOUT High-State Voltage | 3.3 | 4.3 | - | V |
| SYNCOUT Low-State Voltage | 0.15 | 0.25 | - | V |
Key Features
- AEC-Q100 Qualified with device temperature grade 1: -40°C to +125°C
- Maximum input voltage: 42 V, minimum input voltage: 3 V (4.5 V for startup)
- Output voltage up to 50 V
- Bypass (VOUT = VIN) operation
- 1.2 V reference with ±1.0% accuracy
- Free-run and synchronizable switching up to 600 kHz
- 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 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
- Multiphase capability
- Thermally enhanced 20-pin HTSSOP package
Applications
- 12-V, 24-V, and 48-V power systems
- Automotive start-stop systems
- Audio power supply
- High current boost power supply
Q & A
- What is the maximum input voltage for the LM25122-Q1?
The maximum input voltage for the LM25122-Q1 is 42 V.
- What is the minimum input voltage required for startup?
The minimum input voltage required for startup is 4.5 V.
- What is the maximum output voltage the LM25122-Q1 can support?
The maximum output voltage the LM25122-Q1 can support is up to 50 V.
- What is the switching frequency range of the LM25122-Q1?
The switching frequency range of the LM25122-Q1 is programmable up to 600 kHz.
- Does the LM25122-Q1 support multi-phase configuration?
Yes, the LM25122-Q1 supports multi-phase configuration with a 180º phase shifted clock output.
- What protection features does the LM25122-Q1 include?
The LM25122-Q1 includes thermal shutdown, hiccup mode over load protection, and remote shutdown capability.
- What is the quiescent current during shutdown?
The quiescent current during shutdown is 9 μA.
- Can the LM25122-Q1 be used in automotive applications?
Yes, the LM25122-Q1 is AEC-Q100 qualified, making it suitable for automotive applications.
- What is the package type of the LM25122-Q1?
The LM25122-Q1 is available in a 20-pin HTSSOP package with an exposed pad for thermal dissipation.
- Can the VCC be supplied externally?
Yes, the LM25122-Q1 allows for an external VCC supply.
