Overview
The NCP1589AMNTXG is a synchronous buck controller from onsemi, designed for low-voltage applications. This device is part of the NCP1589A/B series, which offers a cost-effective solution for power supply needs. It operates from a supply voltage range of 4.5 V to 13.2 V and can produce output voltages as low as 0.8 V. The controller features a high level of integration, reducing the size and cost of the power supply. It is particularly suited for applications requiring efficient voltage regulation and protection features.
Key Specifications
| Characteristic | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Voltage Range | 4.5 | 13.2 | V | |
| Boost Voltage Range | 4.5 | 30 | V | |
| Oscillator Frequency (NCP1589A) | 270 | 300 | 330 | kHz |
| Oscillator Frequency (NCP1589B) | 540 | 600 | 660 | kHz |
| Minimum Duty Cycle | 0 | % | ||
| Maximum Duty Cycle | 80 | % | ||
| UVLO Threshold (VCC Rising) | 3.8 | 4.0 | 4.2 | V |
| UVLO Threshold (VCC Falling) | 3.4 | 3.6 | 3.8 | V |
| Feedback Voltage (FB) | 0.7936 | 0.8 | 0.8064 | V |
| Internal Gate Drivers | 1.5 A | A |
Key Features
- Voltage Mode PWM Control: The NCP1589A/B uses voltage mode PWM control for efficient voltage regulation.
- Internal 1.5 A Gate Drivers: Features internal gate drivers capable of driving N-channel MOSFETs.
- Adjustable Output Voltage: Output voltage can be adjusted from 0.8 V to 5.0 V using an external resistor divider network.
- Programmable Current Limit: Overcurrent protection threshold can be set using an external ROCSET resistor.
- Protection Features: Includes undervoltage lockout (UVLO), overvoltage protection, and under voltage protection.
- Soft-Start Capability: Prevents excess inrush current during startup with an internal soft-start capacitor.
- Power Good Output: Provides an open-drain active high output pin to signal the condition of the output voltage.
Applications
- Graphics Cards: Suitable for power supply needs in graphics cards.
- Desktop Computers: Used in power supply units for desktop computers.
- Servers / Networking: Applicable in server and networking equipment power supplies.
- DSP & FPGA Power Supply: Ideal for powering Digital Signal Processors (DSPs) and Field-Programmable Gate Arrays (FPGAs).
- DC-DC Regulator Modules: Can be used in various DC-DC regulator modules requiring efficient voltage regulation.
Q & A
- What is the operating supply voltage range of the NCP1589A/B?
The operating supply voltage range is from 4.5 V to 13.2 V.
- What are the available oscillator frequencies for the NCP1589A and NCP1589B?
The NCP1589A operates at 300 kHz, and the NCP1589B operates at 600 kHz.
- How can the output voltage be adjusted?
The output voltage can be adjusted from 0.8 V to 5.0 V using an external resistor divider network.
- What is the purpose of the ROCSET resistor?
The ROCSET resistor is used to set the overcurrent protection threshold voltage.
- What protection features are included in the NCP1589A/B?
The device includes undervoltage lockout (UVLO), overvoltage protection, under voltage protection, and programmable current limit.
- How does the soft-start feature work?
The soft-start feature prevents excess inrush current during startup by ramping the reference voltage over a period of 4 ms using an internal soft-start capacitor.
- What is the function of the PGOOD pin?
The PGOOD pin is an open-drain active high output pin that signals the condition of the output voltage, indicating if it is within the specified range.
- How is overcurrent protection implemented in the NCP1589A/B?
Overcurrent protection is implemented by monitoring the voltage drop across the low-side MOSFET and using an internal counter to latch a fault condition if the threshold is exceeded for four consecutive cycles.
- What are the typical applications of the NCP1589A/B?
The NCP1589A/B is typically used in graphics cards, desktop computers, servers, networking equipment, DSP and FPGA power supplies, and DC-DC regulator modules.
- What is the package type of the NCP1589AMNTXG?
The NCP1589AMNTXG comes in a 10-pin DFN (3x3) package.
