Product Overview
The onsemi FPF2107 is a high-performance, single-channel, low-voltage, high-side power switch designed for load switching and protection applications in modern electronic systems. It integrates a power MOSFET with control circuitry to provide efficient switching, fault protection, and diagnostic feedback. The device is ideal for automotive, industrial, and consumer electronics where precise power control, fault tolerance, and safe operation are critical.
The FPF2107 operates from a supply voltage range of 4.5 V to 28 V, making it suitable for 12 V and 24 V systems. It offers an optimized balance between low on-resistance and fast switching capability, ensuring minimal power loss and thermal dissipation. Integrated protection features include overcurrent limit, thermal shutdown, and load short-circuit detection, enhancing system reliability.
Key Features
* High-side power switch integrating a N-channel MOSFET and control logic
* Operating voltage range: 4.5 V to 28 V
* Continuous load current capability: up to 3.5 A
* Very low RDS(on): typically 30 mΩ at 10 V gate drive
* Controlled inrush current to reduce EMI and protect loads
* Overcurrent protection with automatic shutdown and retry
* Thermal shutdown with hysteresis to prevent damage
* Load short-circuit and overload detection
* Diagnostic open load and short-to-battery detection outputs
* Enable input for switching control and power-saving mode
* Reverse battery protection
* Integrated ESD protection circuitry
* Low quiescent current in off-state (< 10 µA)
* Fault reporting via diagnostic pin
* Compact SOIC-8 or PowerSO-8 surface mount packages
* Automotive AEC-Q100 qualified
Electrical Specifications
* Supply Voltage (VCC): 4.5 V to 28 V
* Continuous Load Current (IL): 3.5 A (maximum, with adequate heat sinking)
* RDS(on) (max): 30 mΩ at VCC = 10 V, IL = 3 A
* Maximum Pulsed Current (Ipeak): 7 A (short duration)
* Overcurrent Threshold: Typically 5.2 A
* Switching Time:
* Turn-on delay: approximately 200 µs (controlled soft start)
* Turn-off delay: approximately 20 µs
* Quiescent Current (device off): < 10 µA typical
* Operating Temperature Range: –40°C to +150°C junction temperature
* Thermal Shutdown Threshold: Approximately 150°C with hysteresis
* Input Logic Level: CMOS/TTL compatible
* Diagnostic Output: Open-drain, reports load faults (open load, short to battery)
Pin Configuration
* Pin 1: Enable (EN) — Input to control the power switch on/off
* Pin 2: Input Voltage (VCC) — Supply voltage input
* Pin 3: Ground (GND)
* Pin 4: Load Output (OUT) — Connection to the load
* Pin 5: Diagnostic Output (DIAG) — Open-drain output indicating faults
* Pins 6-8: Additional grounds or package-specific pins depending on version
Functional Description
The FPF2107 power switch operates as a high-side MOSFET switch controlled by the enable input. When enabled, the device applies voltage from VCC to the load through its integrated MOSFET with low on-resistance, ensuring minimal voltage drop and power dissipation.
The device features a controlled soft-start mechanism, limiting inrush current during load switching to prevent voltage dips and electromagnetic interference (EMI). It monitors the load current continuously; if an overcurrent condition is detected (due to a short circuit or heavy load), the device enters a protective shutdown mode to avoid damage. After a cooldown period, it attempts automatic restart (auto-retry), improving system robustness without requiring a reset.
The diagnostic output pin signals various fault conditions, including open load (load disconnected or failure), short to battery, and overcurrent events, enabling the system microcontroller to take corrective action or alert the user.
Thermal shutdown protects the device and system from overheating by disabling the output when junction temperature exceeds a preset threshold and resumes operation once cooled.
The FPF2107 supports reverse battery conditions and is designed with robust ESD protection to improve system reliability in harsh environments.
Typical Applications
* Automotive body control modules and lighting systems
* Power window and seat control switches
* Industrial motor and solenoid control
* Consumer appliance power management
* Battery-powered systems requiring load protection
* General-purpose load switching with fault diagnostics
Design Considerations
When implementing the FPF2107 in a system, it is important to provide proper thermal management, including adequate copper area on the PCB and, if necessary, additional heat sinking, to maintain junction temperature within safe limits under maximum load conditions.
The device’s diagnostic output requires a pull-up resistor to the microcontroller’s logic supply voltage. The enable input should be driven with CMOS/TTL compatible signals to ensure proper switch operation.
A transient voltage suppression network or input filtering may be required to protect against voltage spikes or surges, especially in automotive and industrial environments.
The PCB layout should minimize inductance and ensure tight coupling between the device’s ground and power return paths to optimize device stability and reduce EMI.
Reliability and Compliance
The FPF2107 is AEC-Q100 qualified and meets stringent automotive reliability standards, ensuring stable operation in extreme temperatures, vibration, and electrical stress. Its integrated protections and diagnostics enhance system safety and fault tolerance.
The device is manufactured under strict quality control and is compliant with RoHS and REACH environmental regulations.
Summary
The onsemi FPF2107 is a versatile, robust high-side power switch with integrated MOSFET and advanced protection features, suitable for automotive, industrial, and consumer load switching applications. Its low on-resistance, comprehensive fault diagnostics, controlled soft-start, and thermal protection provide reliable and safe operation. The device’s wide input voltage range, efficient switching, and compact package enable flexible, efficient power management in complex electronic systems.
