FPF2895UCX - 28V/5A OCP/OVP/TRCB Power Switch | onsemi
料号： FPF2895UCX ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.45 | $1.45 |
| 10 | $1.28 | $12.80 |
| 100 | $1.05 | $105.00 |
| 500 | $0.89 | $445.00 |
| 1,000 | $0.76 | $760.00 |
| 3,000 | $0.62 | $1,860.00 |
FPF2895UCX 概述
A power distribution switch (PDS) is a semiconductor load switch that sits between a DC rail (such as USB VBUS or a battery) and a downstream load, providing controlled turn-on, current limiting, and fault isolation. Power switches belong to the broader category of power management ICs (PMICs) and serve as electronic fuses that protect upstream supplies and connectors from catastrophic downstream faults such as short circuits, inrush surges, or reverse-current injection.
Key features of the FPF2895UCX include ±10% accurate current-limit thresholds, an integrated OVP clamp that disconnects the load when VIN exceeds ~6.0 V (adjustable via external resistor), True Reverse Current Block preventing current backflow into the source, and a fault flag (FLG) output that asserts low when OCP, OVP, or thermal-shutdown events occur. The device also provides a controlled soft-start via internal slew-rate control, reducing inrush current on downstream bulk capacitors.
Architecturally, the FPF2895UCX combines a low-RDS(on) N-channel pass FET with a charge pump for gate drive, a bandgap-referenced current-sense amplifier for OCP, and a comparator-based OVP monitor. The True Reverse Current Block comparator continuously compares VOUT to VIN and disconnects the FET when VOUT > VIN − VRCB(typ 30 mV), which is critical for OTG/multi-source USB designs.
Typical applications include USB Type-C / USB-PD VBUS protection, smartphone and tablet charging paths, hot-swap boards, multi-rail power distribution in routers and docking stations, and any system that needs precise, fast-acting protection between a source and a downstream load. The 24-WLCSP footprint also makes it ideal for space-constrained portable designs.
When designing in this part, place input and output bulk capacitors as close to the device as possible and follow the WL-CSP PCB layout guidelines for non-solder-mask-defined (NSMD) land pads to avoid solder-joint fatigue. Always honor the 28 V abs max and derate accordingly for transient VIN spikes common in USB Type-C environments.
This page synthesizes distributor pricing, drop-in alternatives, application guidance, and WL-CSP PCB layout considerations not found in the manufacturer datasheet alone.
直接替换替代料： FPF2895UCX ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
FPF2895CUCX
✅ 直接替换📋 参考替代料（不在目录中）
FPF2895UCX-Q1
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
FPF2895UCX-2
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
FPF2895UCX 最大额定值与电气特性
| 功能 | Current-limit / load switch with OVP and TRCB |
| Configuration | 1:1 N-Channel high-side |
| Maximum Input Voltage (Continuous) | 28 V |
| Operating Input Voltage Range | 4 V to 22 V |
| Continuous Load Current | 5 A |
| On-Resistance (typ) | 27 mΩ |
| Over-Current Protection | Yes (adjustable via ISET) |
| Over-Voltage Protection | Yes (adjustable OVP threshold) |
| True Reverse Current Block (TRCB) | Yes |
| Fault Flag Output | Yes (open-drain FLG) |
| Soft-Start / Slew Rate Control | Yes (integrated) |
| 热关断 | Yes |
| 工作温度范围 | -40 °C to +85 °C |
| 封装 | 24-WLCSP (2.6 x 1.67 mm) |
| 安装类型 | Surface Mount |
| MSL 等级 | 1 |
| RoHS 状态 | Compliant |
FPF2895UCX 引脚配置
| 引脚 A1 | VIN — Input voltage (4 V to 22 V operating, 28 V abs max) |
| 引脚 A2 | VIN — Input voltage (bonded to A1) |
| 引脚 A3 | GND — Ground return |
| 引脚 A4 | NC — Not connected (per datasheet) |
| 引脚 A5 | NC — Not connected (per datasheet) |
| 引脚 A6 | OVP — Over-voltage protection threshold set |
| 引脚 B1 | VIN — Input voltage |
| 引脚 B2 | VIN — Input voltage |
| 引脚 B3 | GND — Ground |
| 引脚 B4 | EN — Enable (active high) |
| 引脚 B5 | FLG — Fault flag output (open drain, active low) |
| 引脚 B6 | OVP — OVP reference |
| 引脚 C1 | VOUT — Switch output to load |
| 引脚 C2 | VOUT — Switch output |
| 引脚 C3 | VOUT — Switch output |
| 引脚 C4 | VOUT — Switch output |
| 引脚 C5 | ISET — Current limit programming resistor |
| 引脚 C6 | FLG — Fault flag return |
| 引脚 D1 | VOUT — Switch output |
| 引脚 D2 | VOUT — Switch output |
| 引脚 D3 | VOUT — Switch output |
| 引脚 D4 | VOUT — Switch output |
| 引脚 D5 | ISET — Current limit programming |
| 引脚 D6 | GND — Ground |
典型应用
FPF2895UCX 适用于 6 应用s: USB Type-C / USB-PD VBUS Protection, Smartphone and Tablet Charging Path Switch, Hot-Swap / Plug-In Card Protection, Multi-Rail Power Distribution in Docking Stations, IoT / Smart Home Gateway Power Gating, Industrial Sensor and Actuator Power Bus Protection.
USB Type-C / USB-PD VBUS Protection
The FPF2895UCX sits between the VBUS rail of a USB Type-C / USB-PD port and the downstream system, providing 5 A continuous current handling with 27 mΩ typical RDS(on). Its 28 V abs max comfortably covers the USB-PD 20 V profile plus transient spikes, while the integrated OVP clamps VBUS above the configured threshold (~6 V default) to protect downstream ICs. The True Reverse Current Block (TRCB) feature prevents backfeed from the device into the source during OTG or role-swap events, which is critical for dual-role port implementations. Engineers typically place a 10 µF ceramic input cap and 22 µF output cap on the WLCSP land pads, observing the NSMD pad rules in the datasheet.
推荐
Smartphone and Tablet Charging Path Switch
Inside a smartphone or tablet reference design, the FPF2895UCX functions as the protection switch between the charger input and the battery management IC. Its 5 A rating covers high-current fast-charging protocols (QC, AFC, VOOC) up to 25 W, while the 27 mΩ RDS(on) limits conduction losses to roughly 0.13 W at 3 A, keeping the WL-CSP within thermal limits. The integrated soft-start controls inrush into large downstream bulk capacitors, preventing input rail droop during charge plug-in. The fault flag (FLG) signals the host PMIC when OCP/OVP/thermal events trip, enabling graceful fault recovery and user notification.
推荐
Hot-Swap / Plug-In Card Protection
In router, switch, and server backplane designs, the FPF2895UCX provides hot-swap protection on each plug-in card's power rail. When a card is inserted into a live backplane, the soft-start circuitry ramps VOUT slowly to limit inrush into the card's bulk capacitance, while the OCP comparator shuts off the FET if the card draws excessive current (indicating a short). The 24-WLCSP 2.6 x 1.67 mm package is small enough to fit on standard 1.0 mm pitch card-edge connectors. The TRCB function also prevents reverse discharge from a charged card back into an unpowered backplane during service events.
推荐
Multi-Rail Power Distribution in Docking Stations
Docking stations with multiple USB, HDMI, and downstream ports need a robust power-distribution layer to isolate each rail from faults on the others. The FPF2895UCX provides per-port protection with its 5 A continuous rating, OVP that disconnects over-voltage conditions (e.g., from a misbehaving source), and the FLG pin that ties back to a port-expander GPIO for fault reporting to the host MCU. The 27 mΩ RDS(on) keeps voltage drop at 100 mV at 3.7 A, preserving compliance with USB-PD tolerance windows. Multiple FPF2895UCX devices can be cascaded across the docking station's downstream ports without risk of fault propagation.
推荐
IoT / Smart Home Gateway Power Gating
In IoT gateways, the FPF2895UCX can power-gate individual sensor or radio subsystems to reduce quiescent current during sleep states. Its 4 V minimum input supports Li-ion battery ranges, and the 27 mΩ RDS(on) minimizes voltage drop on the gated rail. The FLG output can wake the host MCU if a downstream sensor faults, while OCP prevents catastrophic failure if a sensor shorts during operation. Using multiple FPF2895UCX switches, designers can independently power-cycle Wi-Fi, BLE, and Zigbee radios on demand, achieving deep sleep currents below 50 µA on the gated rails.
推荐
Industrial Sensor and Actuator Power Bus Protection
On industrial PLCs and 24 V sensor/actuator buses, the FPF2895UCX isolates downstream faults without interrupting the entire bus. Its 28 V abs max covers the 24 V nominal industrial rail plus transients common in motor-drive environments. With 5 A continuous rating, it can power entire banks of digital I/O or a single high-current actuator. The OVP feature clamps inductive kickback from solenoids, while the FLG output feeds back to the PLC for diagnostics. Compared to a PTC fuse, the FPF2895UCX resets automatically after the fault clears and offers tighter (±10%) current-limit accuracy.
推荐
推荐产品汇总
工程参考数据： FPF2895UCX ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | FPF2895CUCX | FPF2895UCX-Q1 | FPF2895UCX-2 | TPS25221DRLR | AP22804AW5-7 |
|---|---|---|---|---|---|---|
| Package | 24-WLCSP (2.6x1.67 mm) | 24-WLCSP (2.6x1.67 mm) | 24-WLCSP (2.6x1.67 mm) | 24-WLCSP (2.6x1.67 mm) | SOT-583 (6-pin) | SOT-25 (5-pin) |
| Brand | onsemi | onsemi | onsemi | onsemi | Texas Instruments | Diodes Incorporated |
| Max Input Voltage | 28 V | 28 V | 28 V | 28 V | 6.5 V | 6 V |
| Continuous Load Current | 5 A | 5 A | 5 A | 5 A | 2 A | 2 A |
| On-Resistance (typ) | 27 mΩ | 27 mΩ | 27 mΩ | 27 mΩ | 65 mΩ | 70 mΩ |
| Over-Voltage Protection | Yes (integrated) | Yes | Yes | Yes | No | No |
| True Reverse Current Block | Yes | Yes | Yes | Yes | No | No |
| AEC-Q100 Automotive | No | No | Yes | No | No | No |
关键差异点
- Integrated True Reverse Current Block （对比 TPS25221DRLR)
- 5 A continuous current in 24-WLCSP （对比 AP22804AW5-7)
- 28 V abs max VIN supports USB-PD 20 V profile （对比 TPS25221DRLR)
设计说明
The 24-WLCSP package uses NSMD (non-solder-mask-defined) land pads with a typical diameter of 0.3 mm and pitch of 0.4 mm. Use a via-in-pad or micro-via topology with plugged-and-capped plating to avoid solder wicking during reflow. The onsemi WLCSP land-pattern guide recommends keeping solder paste at 0.1 mm thickness and avoiding NSMD-to-SMD transition zones, which would create uneven solder joints and reliability risk.
Estimated: at continuous 5 A through a 27 mΩ RDS(on) channel, conduction loss is approximately 0.675 W. With a 24-WLCSP thermal resistance (θJA) of roughly 50 °C/W on a standard 2-layer 1-oz JEDEC test board, the junction temperature rise above ambient is approximately 33 °C, leaving ample thermal margin for USB VBUS and 5 V rail applications. For 24 V-to-load switching at 5 A, prefer 2-oz copper pours and thermal vias directly under the CSP balls.
Do not operate the FPF2895UCX continuously above 28 V abs max - inductive kickback from long cables or motors can destroy the part even when average VIN is well below 28 V. Always place a TVS diode (e.g., SMBJ24A) at the input for hot-plug protection. Also note that the OVP threshold is set by an external resistor divider - omitting this resistor leaves OVP at its default and may not match your system voltage.
合规信息
RoHS and REACH compliant per onsemi product page. Standard FPF2895UCX is not AEC-Q100 qualified - select FPF2895UCX-Q1 for automotive.
