Overview
The NCP3235MNTXG, produced by onsemi, is a high-current, high-efficiency voltage-mode synchronous buck converter. It operates from an input voltage range of 4.5 V to 23 V and can generate output voltages as low as 0.6 V with a continuous current of up to 15 A. This converter is designed to offer high efficiency and robust protection features, making it suitable for a variety of power management applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 4.5 - 23 | V |
| Output Voltage Range | 0.6 - 21 | V |
| Maximum Output Current | 15 | A |
| Switching Frequency Options | 550 kHz, 1.1 MHz | - |
| Package Type | QFN-40 (6x6 mm) | - |
| Operating Ambient Temperature Range | -40 to +85 | °C |
| Operating Junction Temperature Range | -40 to +125 | °C |
| Maximum Junction Temperature | +150 | °C |
| High-side On Resistance (RDSONH) | 6.5 - 10 | mΩ |
| Low-side On Resistance (RDSONL) | 2.9 - 5.2 | mΩ |
Key Features
- Wide Input Voltage Range: Operates from 4.5 V to 23 V.
- High Efficiency: Achieves high efficiency at both heavy and light loads.
- Automatic CCM/DCM Mode: Smoothly switches between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) to optimize efficiency.
- External Programmable Soft-Start: Allows for adjustable startup times using an external capacitor.
- Lossless Low-side FET Current Sensing: Enhances overcurrent protection accuracy.
- Protection Features: Includes output over-voltage protection (OVP), under-voltage protection (UVP), and thermal shutdown.
- Selective Hiccup/Latch Off Operation: For all faults, providing flexible fault handling.
- Power Good Indicator: Monitors the output voltage and signals when it is out of regulation or during fault conditions.
Applications
The NCP3235MNTXG is suitable for various high-current power management applications, including:
- Server and data center power supplies
- Telecommunication equipment
- Industrial power systems
- High-performance computing systems
- Automotive and aerospace power management
Q & A
- What is the input voltage range of the NCP3235MNTXG?
The input voltage range is from 4.5 V to 23 V.
- What is the maximum output current of the NCP3235MNTXG?
The maximum output current is up to 15 A.
- What are the switching frequency options for the NCP3235MNTXG?
The switching frequency options are 550 kHz and 1.1 MHz.
- What type of package does the NCP3235MNTXG come in?
The NCP3235MNTXG comes in a QFN-40 (6x6 mm) package.
- What protection features does the NCP3235MNTXG offer?
The NCP3235MNTXG offers output over-voltage protection (OVP), under-voltage protection (UVP), overcurrent protection (OCP), and thermal shutdown.
- How does the automatic CCM/DCM mode work?
The automatic CCM/DCM mode allows the converter to switch smoothly between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) to optimize efficiency at different load conditions.
- What is the purpose of the power good indicator?
The power good indicator monitors the output voltage and signals when it is out of regulation or during fault conditions.
- How is the soft-start period programmed?
The soft-start period is programmed using an external capacitor connected from the SS pin to ground.
- What happens during thermal shutdown?
During thermal shutdown, both the high-side and low-side MOSFETs are turned off, and the device initiates a soft-start once the temperature drops below the hysteresis threshold.
- How does the overcurrent protection work?
The overcurrent protection senses the peak freewheeling current in the low-side FET and compares it against a user-selected resistor and an internal temperature-compensated current source.
