MP8003A - IEEE 802.3af/at PoE PD Interface Controller | MPS
料号： MP8003A ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
MP8003A 概述
A PoE powered device interface controller is the circuit that sits between an Ethernet cable and the DC-DC converter of a powered device such as an IP camera, wireless access point, or VoIP phone. Its job is to safely negotiate power with the power sourcing equipment (PSE): it presents a valid detection signature, communicates its power class, and then connects the incoming 48V-class rail to the downstream converter through a controlled hot-swap switch. It is a specialized member of the power management IC family, bridging networking and power electronics.
Key features of the MP8003A include full IEEE 802.3af and 802.3at (PoE+) compliance, an inrush current limit of about 120 mA during start-up that switches to an 840 mA operating current limit once the output pass MOSFET is fully enhanced, and an integrated 100V-rated hot-swap MOSFET that eliminates the need for an external pass device. Input current control protects the PSE port under overload conditions.
The device also provides two status signals that simplify system design. A power-good (PG) output is set high when the PD interface output is fully charged and pulls low when the output voltage drops under an overload condition, giving downstream converters a clean sequencing signal. A T2P output asserts when the PD is connected to Type-2 (PoE+) power sourcing equipment, allowing the system to enable higher-power modes dynamically. Classification supports both 1-event (802.3af) and 2-event (802.3at) schemes.
Typical applications include IP surveillance cameras, IEEE 802.11 wireless access points, VoIP telephones, and networked industrial sensors where power and data share one Ethernet cable. The integrated MOSFET and small QFN footprint suit compact, cost-sensitive PD designs.
For design, ensure the hot-swap MOSFET thermal budget covers the 840 mA operating current limit and verify bulk output capacitance against the 120 mA inrush limit to avoid false PSE disconnect signatures.
This page synthesizes distributor availability data, MPS application context, and drop-in alternative analysis not found in the manufacturer datasheet.
直接替换替代料： MP8003A ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MP8003A （相同外形与封装尺寸） ——差异在于 Detection, Function, Input Current Control, Package, Standards Compliance.
快速对比工具——选择替代料号进行并排对比：
MP8004
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MP8003A 最大额定值与电气特性
| 功能 | PoE Powered Device (PD) Interface Controller |
| Standards Compliance | IEEE 802.3af, IEEE 802.3at (PoE+) |
| 通道数 | 1 |
| Detection | Yes (IEEE 802.3af/at signature detection) |
| Classification | 1-event and 2-event classification |
| Integrated Hot-Swap MOSFET | Yes, 100 V rated |
| Inrush Current Limit | Approx. 120 mA (start-up) |
| Operating Current Limit | 840 mA |
| Input Current Control | Yes |
| 电源正常输出 | Yes (PG, high when output fully charged) |
| T2P Output | Yes (indicates Type-2 PSE connection) |
| 封装 | 10-QFN (3x3 mm) |
| 安装类型 | Surface Mount |
MP8003A 10-qfn (3x3 mm) 引脚配置指南
MP8003A（10-qfn (3x3 mm) 封装）的引脚配置。 该功率器件具有栅极、漏极和源极端子。对于无极性封装，请参阅制造商数据手册以了解确切的引脚 1 方向和封装尺寸细节。常见应用包括电源设计、电机驱动和负载开关。
暂无详细引脚数据： MP8003A.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MP8003A 适用于 6 应用s: IP Surveillance Cameras, Wireless Access Points, VoIP Telephones, Networked Industrial Sensors, PoE Splitters and Midspan-Powered Devices, Intercoms and Building Access Systems.
IP Surveillance Cameras
IP cameras are the highest-volume PoE powered device application, and the MP8003A fits them directly: its IEEE 802.3af/at compliance handles PSE detection, 1-event and 2-event classification, and its integrated 100V hot-swap MOSFET safely connects the Ethernet-derived 48V-class rail without an external pass FET. In the circuit, the MP8003A sits between the Ethernet magnetics center tap and the camera's DC-DC converter, charging bulk capacitance at the 120 mA inrush limit to avoid violating the PSE inrush signature. Once the pass MOSFET is fully on, the 840 mA operating limit supports typical camera power budgets, while the PG output sequences the converter and T2P lets the camera enable PoE+ features such as IR illuminators or PTZ motors when a Type-2 PSE is detected.
推荐
Wireless Access Points
Enterprise wireless access points frequently draw more than 802.3af allows, making 802.3at (PoE+) support essential - exactly what the MP8003A provides through 2-event classification and the T2P output that indicates a Type-2 PSE connection. The MP8003A's 840 mA operating current limit, once the integrated 100V hot-swap MOSFET is fully enhanced, aligns with the sustained input current of Class 4 PD front ends. In a typical design the controller connects the PoE rail at the 120 mA inrush limit during start-up so large bulk capacitors charge without tripping PSE disconnect detection, then releases the downstream multi-rail converter via the PG signal. Dual-band radios benefit from T2P-gated power mode switching: when the access point detects only a Type-1 PSE, it can throttle transmit power to stay within the lower budget.
推荐
VoIP Telephones
VoIP desk phones are classic IEEE 802.3af Class 2/3 powered devices, and the MP8003A provides the complete PD front end they require: detection signature, 1-event classification, input current control, and the integrated 100V hot-swap MOSFET in a compact 10-QFN (3x3 mm) footprint that suits the constrained PCB area behind a phone faceplate. During plug-in, the 120 mA inrush limit charges the phone's bulk capacitance within IEEE limits; the PG output then enables the downstream buck converter that generates 5V and 3.3V logic rails. Input current control at 840 mA protects the PSE port under fault conditions such as a shorted downstream converter. The small QFN package and minimal external component count reduce BOM cost, which matters in the highly price-sensitive enterprise telephony market.
推荐
Networked Industrial Sensors
Industrial PoE deployments - factory sensors, edge gateways, and environmental monitors - benefit from the MP8003A's 100V-rated integrated hot-swap MOSFET, which provides generous voltage margin against the long-cable transients and surge environments common in industrial Ethernet plants. The controller implements the full IEEE 802.3af/at handshake, so industrial PSEs in switches and midspans detect and classify the sensor node reliably; 2-event classification lets a sensor declare a PoE+ budget when it hosts power-hungry optics or local processing. Start-up is managed at the 120 mA inrush limit to protect PSE ports on shared switches, and the 840 mA operating limit plus input current control guard against cable faults. The PG output guarantees the sensor MCU only boots after the PoE rail is stable.
推荐
PoE Splitters and Midspan-Powered Devices
PoE splitter modules that deliver isolated or regulated DC outputs to non-PoE equipment use the MP8003A as the PD front end. The device presents a valid detection and classification signature to the PSE, connects the 48V-class rail through the integrated 100V hot-swap MOSFET, and signals readiness via PG so the splitter's converter stage only starts after the rail is fully charged - avoiding converter hiccups during inrush. The staged current limiting (about 120 mA inrush, 840 mA operating) matches the capacitance budgets of splitter output banks, and input current control protects the upstream port if the splitter output is shorted. For splitter designs serving PoE+ sources, the T2P output can gate higher-power operation, letting one hardware platform serve both 802.3af and 802.3at markets.
推荐
Intercoms and Building Access Systems
Door intercoms, IP access-control panels, and door controllers are commonly powered over the same Ethernet run that carries their data, and the MP8003A provides their IEEE 802.3af/at PD interface with minimal board space. Its integrated 100V hot-swap MOSFET tolerates the wiring transients typical of building cabling, while 120 mA inrush limiting allows safe charging of the bulk capacitors that also support lock-solenoid inrush events downstream. The 840 mA operating current limit with input current control keeps the PD within its declared class even when actuators fire, and the PG output ensures the access controller boots only after the rail is stable. The T2P signal lets panels enable power-hungry features such as video doorbell cameras when a PoE+ PSE is present.
推荐
推荐产品汇总
工程参考数据： MP8003A ——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 | MP8004 |
|---|---|---|
| Package | 10-QFN (3x3 mm) | 10-QFN (3x3 mm) - same footprint family, verify pin map |
| Brand | Monolithic Power Systems | Monolithic Power Systems |
| PoE Standards | IEEE 802.3af and 802.3at | IEEE 802.3af and 802.3at |
关键差异点
- Integrated 100V hot-swap MOSFET removes external pass FET （对比 MP8004)
- PG and T2P dual status signaling （对比 MP8004)
- Staged inrush-to-operating current limiting （对比 MP8004)
设计说明
Budget the bulk output capacitance against the MP8003A's 120 mA inrush limit: I = C x dV/dt, so with an effective inrush window defined by the IEEE 802.3af/at specification and the 120 mA ceiling, excessive capacitance can extend the charge phase and cause PSE disconnect faults. Per the MPS datasheet, the device switches to the 840 mA operating limit only after the pass MOSFET is fully enhanced, so downstream converter startup must be gated by the PG signal to avoid exceeding the operating limit during simultaneous cap charge and load startup.
Place the MP8003A's 10-QFN (3x3 mm) exposed pad connection with a solid ground pour and multiple thermal vias, since the integrated 100V hot-swap MOSFET dissipates power during the inrush phase and during current-limit operation. Keep the sense path to the hot-swap MOSFET short and wide to minimize parasitic resistance that could degrade current-limit accuracy, and place the input bulk and 0.1 uF decoupling capacitors within a few millimeters of the VDD/RTN pins per standard MPS PD interface layout practice.
Do not ignore the T2P signal in mixed 802.3af/802.3at deployments: if the downstream converter is always configured for PoE+ power levels, a Type-1 PSE connection can cause the PD to exceed the 13 W class budget and trigger PSE current-limit disconnects. Gate the higher-power load modes with T2P. Also verify classification resistor values against the MPS datasheet class table - an incorrectly set class signature causes the PSE to allocate the wrong budget.
合规信息
Compliance data was not present in the verified web data. MPS parts commonly carry RoHS-compliant suffixes (e.g. -Z); confirm on the MPS product page or DigiKey listing before release.
