Overview
The NCP81245MNTXG is a three-rail output controller designed by ON Semiconductor, optimized for Intel's IMVP8 CPUs. This controller features a 3+3+1 phase buck solution, making it suitable for desktop and notebook processor applications, including gaming systems. It incorporates advanced technologies such as Dual-Edge pulse-width modulation (PWM) and DCR current sensing, ensuring ultra-fast initial response to dynamic load events and reduced system cost. The device also includes a single-phase rail with enhanced RPM (Rapid Pulse Modulation) control for high-performance operation.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Vin Range | 4.5 | 20 | V | |
| Switching Frequency Range | 300 kHz | 750 kHz | ||
| Operating Junction Temperature Range | −40°C | 125°C | ||
| Operating Ambient Temperature Range | −40°C | 100°C | ||
| Maximum Storage Temperature Range | −40°C | 150°C | ||
| Thermal Characteristic (QFN Package) | 68 | °C/W | ||
| VCC Supply Voltage Range | 4.75 V | 5.25 V | ||
| Quiescent Current (Enable High) | 33 mA | 50 mA | ||
| Quiescent Current (Enable Low) | 60 μA |
Key Features
- Dual-Edge pulse-width modulation (PWM) for fast initial response to transient loading
- High-performance operational error amplifier and accurate total summing current amplifier
- Dual high-impedance differential voltage and total current sense amplifiers
- Phase-to-phase dynamic current balancing and true differential current balancing sense amplifiers for each phase
- Adaptive Voltage Positioning (AVP) and UltraSonic operation
- Enhanced RPM control system for the single-phase rail with ultra-low offset IOUT monitor
- Dynamic VID feed-forward, programmable droop gain, and zero droop capability
- Thermal monitor and adjustable Vboot
- Digitally controlled operating frequency and startup into pre-charged loads while avoiding false OVP
Applications
- Desktop and notebook processors
- Gaming systems
Q & A
- What is the NCP81245MNTXG optimized for?
The NCP81245MNTXG is optimized for Intel's IMVP8 CPUs.
- What is the switching frequency range of the NCP81245MNTXG?
The switching frequency range is 300 kHz to 750 kHz.
- What is the operating junction temperature range of the NCP81245MNTXG?
The operating junction temperature range is −40°C to 125°C.
- What are the key features of the Dual-Edge PWM in the NCP81245MNTXG?
The Dual-Edge PWM provides fast initial response to transient loading and combines with DCR current sensing for ultra-fast response and reduced system cost.
- How does the NCP81245MNTXG handle current balancing?
The device uses phase-to-phase dynamic current balancing and true differential current balancing sense amplifiers for each phase.
- What is the purpose of the RPM control system in the single-phase rail?
The RPM control system maximizes transient response while allowing smooth transitions between discontinuous-frequency-scaling operation and continuous-mode full-power operation.
- How is the Vboot voltage programmed in the NCP81245MNTXG?
The Vboot voltage is externally programmed using a single resistor, with the pin voltage measured during startup.
- What are the applications of the NCP81245MNTXG?
The NCP81245MNTXG is used in desktop and notebook processors, including gaming systems.
- Is the NCP81245MNTXG RoHS compliant?
Yes, the NCP81245MNTXG is Pb-free and RoHS compliant.
- How does the NCP81245MNTXG handle thermal monitoring?
The device includes a thermal monitor to sense the temperature of the inductors, allowing for compensation in the current sensing gain.
