Overview
The NCP81234MNTXG, produced by onsemi, is a dual-channel/two-phase synchronous buck controller designed to provide flexible power management solutions, particularly for applications supported by DrMOS (Driver-MOSFET). This controller operates at high switching frequencies up to 1.2 MHz, allowing the use of small-sized inductors and capacitors. It features a single input voltage range of 4.5 to 20 V and supports output voltages from 0.6 V to 5.3 V. The device is integrated with a 5.35 V LDO and offers comprehensive protection and monitoring features, making it suitable for various high-performance applications.
Key Specifications
| Parameter | Value | Unit | Conditions |
|---|---|---|---|
| Input Voltage Range | 4.5 to 20 | V | |
| Output Voltage Range | 0.6 to 5.3 | V | |
| Switching Frequency Range | 200 kHz to 1.2 MHz | ||
| PWM Output Compatibility | 3.3 V and 5 V DrMOS | ||
| Integrated LDO Voltage | 5.35 V | V | |
| Package Type | QFN-28, 5x5 mm, 0.5 mm Pitch | ||
| Thermal Shutdown Temperature | 165°C (typical) | °C | |
| Maximum Junction Temperature | 125°C | °C |
Key Features
- Dual-channel or two-phase operation with interleaved operation capability
- Programmable DrMOS power ready detection (DRVON) and two power good indicators
- Comprehensive fault indicator and cycle-by-cycle fault signal output
- Programmable soft start and delay time, with support for output pre-biased conditions
- Differential current sense compatible for both inductor DCR sense and DrMOS Iout
- Programmable hiccup over current protection, under voltage protection, and over temperature protection
- Recoverable over voltage protection with two levels (OVPL and OVPH)
- DDR power mode option with independent fault detections and protections for each channel
- Integrated 5.35 V LDO and input feedforward
Applications
- Telecom applications
- Server and storage systems
- Multiple rail systems
- DDR applications
Q & A
- What is the input voltage range of the NCP81234MNTXG?
The input voltage range is from 4.5 V to 20 V.
- What are the supported output voltage ranges for this controller?
The output voltage range is from 0.6 V to 5.3 V.
- What is the maximum switching frequency of the NCP81234MNTXG?
The maximum switching frequency is up to 1.2 MHz.
- Does the NCP81234MNTXG support DDR mode operation?
- What types of protections are integrated into the NCP81234MNTXG?
The device includes over current protection, under voltage protection, over voltage protection, and over temperature protection, among others.
- How is the thermal shutdown protection implemented in the NCP81234MNTXG?
The device has an internal thermal shutdown protection that activates when the die temperature exceeds 165°C, shutting down the chip until the temperature drops below 125°C.
- What is the purpose of the FAULT signal in the NCP81234MNTXG?
The FAULT signal provides a comprehensive fault indicator, including cycle-by-cycle fault signals for both channels.
- Can the NCP81234MNTXG operate in interleaved mode?
- How is the soft start function programmed in the NCP81234MNTXG?
The soft start time is externally programmed at the SS pins, allowing for smooth startup under output pre-biased conditions.
- What package type is the NCP81234MNTXG available in?
The device is available in a QFN-28 package with a 5x5 mm footprint and 0.5 mm pitch.
