Overview
The NCP45541IMNTWG-H is an advanced load switch from onsemi, designed to provide efficient power domain switching with integrated control functionality. This device features an ultra-low on-resistance N-channel MOSFET, making it ideal for applications requiring low power consumption and a small footprint. The NCP45541IMNTWG-H includes a charge pump, soft-start via controlled slew rate, and power good signaling, making it suitable for a wide range of power management and hot-swap applications.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage | VCC | 3.0 | 5.5 | V | |
| Input Voltage | VIN | 0.5 | 13.5 | V | |
| Ambient Temperature | TA | -40 | 85 | °C | |
| Junction Temperature | TJ | -40 | 125 | °C | |
| MOSFET On-Resistance (VCC = 3.3 V, VIN = 1.8 V) | RON | 7.7 | 8.9 | 9.3 | mΩ |
| Leakage Current (VEN = 0 V, VIN = 13.5 V) | ILEAK | 0.1 | 1.0 | μA | |
| Supply Standby Current (VEN = 0 V, VCC = 3 V) | ISTBY | 0.65 | 2.0 | μA | |
| EN Input High Voltage (VCC = 3 V - 5.5 V) | VIH | 2.0 | V | ||
| EN Input Low Voltage (VCC = 3 V - 5.5 V) | VIL | 0.8 | V |
Key Features
- Advanced controller with charge pump
- Integrated N-channel MOSFET with ultra-low on-resistance (RON)
- Soft-start via controlled slew rate
- Adjustable slew rate control
- Power good signal (active-high, open-drain output)
- Extremely low standby current
- Load bleed (quick discharge) functionality
- Pb-free device
Applications
- Portable electronics and systems
- Notebook and tablet computers
- Telecom, networking, medical, and industrial equipment
- Set-top boxes, servers, and gateways
- Hot-swap devices and peripheral ports
Q & A
- What is the input voltage range of the NCP45541IMNTWG-H?
The input voltage range is from 0.5 V to 13.5 V.
- What is the typical on-resistance of the MOSFET at VCC = 3.3 V and VIN = 1.8 V?
The typical on-resistance (RON) is 8.9 mΩ.
- How does the soft-start feature work?
The soft-start feature is implemented via a controlled slew rate, which limits the inrush current caused by capacitor charging.
- What is the purpose of the power good (PG) signal?
The power good signal indicates when the gate of the MOSFET is fully charged and can be used as an enable signal for other devices in the system.
- How is the load bleed functionality used?
The load bleed functionality is used to discharge the load to ground after the MOSFET is disabled, and it can be connected directly or through an external resistor.
- What are the recommended power sequences for the NCP45541IMNTWG-H?
The recommended power sequences are VCC → VIN → VEN and VIN → VCC → VEN, ensuring VCC is at least 2 V when EN is asserted.
- What is the maximum continuous power that can be dissipated across the bleed resistor?
The maximum continuous power that can be dissipated across the bleed resistor (RBLEED) is 0.4 W.
- How can the slew rate be adjusted?
The slew rate can be adjusted by adding an external capacitor between the SR pin and ground.
- What is the significance of the internal pull-up and pull-down resistors on the EN pin?
The internal pull-up and pull-down resistors ensure the MOSFET is disabled when the EN pin is not being driven, depending on whether it is an active-high (NCP45541-H) or active-low (NCP45541-L) configuration.
- What are some typical applications of the NCP45541IMNTWG-H?
Typical applications include portable electronics, notebook and tablet computers, telecom and networking equipment, and hot-swap devices.
