Overview
The NCP1597A, produced by onsemi, is a synchronous PWM controller designed to meet a wide range of power management needs. This device integrates all the necessary control and protection circuitry, making it a comprehensive solution for various applications. It employs current mode control, which provides fast transient response, simple compensation, and excellent stability. The NCP1597A features a precision internal reference, a fixed 1 MHz switching frequency, and integrated high-side P-channel and low-side N-channel MOSFETs. It also includes internal soft-start, pulse-by-pulse current limiting, and thermal shutdown, ensuring robust and reliable operation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 4.0 - 5.5 | V |
| Output Voltage Range | 0.8 - Vin | V |
| Maximum Output Current | 2.0 | A |
| Switching Frequency | 1 MHz | |
| High-Side MOSFET RDS(on) | 140 mΩ | |
| Low-Side MOSFET RDS(on) | 90 mΩ | |
| Soft-Start Time | 1 ms | |
| Thermal Shutdown Threshold | 185 °C | |
| Operating Temperature Range | -40 to +85 °C | |
| Junction Temperature Range | -40 to +150 °C |
Key Features
- Fixed 1 MHz switching frequency
- Internal soft-start to limit inrush currents
- Cycle-by-cycle current limiting and short-circuit protection
- Thermal shutdown and overtemperature protection
- Power saving mode during light load conditions
- Integrated high-side P-channel and low-side N-channel MOSFETs
- Adjustable output voltage down to 0.8 V
- Adaptive dead time gate driver to prevent shoot-through and minimize diode conduction loss
- Pulse width modulation with high-speed PWM comparator
Applications
- DSP Power
- Hard Disk Drivers
- Computer Peripherals
- Home Audio
- Set-Top Boxes
- Networking Equipment
- LCD TV
- Wireless and DSL/Cable Modem
- USB Power Devices
Q & A
- What is the input voltage range of the NCP1597A?
The input voltage range of the NCP1597A is from 4.0 V to 5.5 V.
- What is the maximum output current of the NCP1597A?
The maximum output current of the NCP1597A is 2.0 A.
- What is the switching frequency of the NCP1597A?
The switching frequency of the NCP1597A is fixed at 1 MHz.
- What protection features does the NCP1597A include?
The NCP1597A includes cycle-by-cycle current limiting, short-circuit protection, thermal shutdown, and overtemperature protection.
- How does the NCP1597A manage power during light load conditions?
The NCP1597A enters power saving mode during light load conditions, skipping switching and operating with reduced frequency to minimize quiescent current and maintain high efficiency.
- What is the purpose of the internal soft-start in the NCP1597A?
The internal soft-start in the NCP1597A limits the startup inrush current by ramping up the reference voltage from 0 V to its final value linearly over a period of 1 ms.
- What is the thermal shutdown threshold of the NCP1597A?
The thermal shutdown threshold of the NCP1597A is 185 °C.
- What types of MOSFETs are integrated in the NCP1597A?
The NCP1597A integrates high-side P-channel and low-side N-channel MOSFETs.
- How does the adaptive dead time gate driver work in the NCP1597A?
The adaptive dead time gate driver in the NCP1597A prevents shoot-through and minimizes diode conduction loss by optimizing the dead time between the low side drive signal and high side drive signal.
- What is the operating temperature range of the NCP1597A?
The operating temperature range of the NCP1597A is from -40 °C to +85 °C.
