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STMicroelectronics PM8800ATR
- Part No.:
- PM8800ATR
- Manufacturer:
- STMicroelectronics
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
PM8800ATR.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:9,703
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Product details
Overview
PM8800ATR from STMicroelectronics is an IEEE 802.3af-compliant Power over Ethernet (PoE) Powered Device (PD) interface IC with integrated current-mode PWM controller, 100 V/0.5 Ω hot-swap MOSFET, programmable DC current limit up to 800 mA, and support for auxiliary power sources. It enables high-power (>12.95 W) PoE-powered devices such as security cameras and VoIP phones operating in isolated or non-isolated DC-DC topologies.
For engineers reviewing the PM8800ATR datasheet, PM8800ATR pinout, PM8800ATR application, or PM8800ATR equivalent, this device delivers verified PoE detection/classification compliance, dual-source power management (PoE + auxiliary), cycle-by-cycle current limiting, thermal shutdown protection, and programmable soft-start-critical for robust PD design under variable input conditions.
Technical Context
The PM8800ATR implements a dual-stage power management architecture: its IEEE 802.3af PD interface handles detection (24.5 kΩ signature resistor), classification (programmable RCLASS), UVLO (38.5 V release / 31.5 V lockout), and in-rush current control via internal MOSFET; simultaneously, its current-mode PWM controller supports both isolated flyback and non-isolated buck configurations with 80% max duty cycle, slope compensation, and 100 kHz typical oscillator frequency.
It integrates auxiliary source arbitration logic (AUXI_IRL and AUXII pins) enabling seamless switchover between PoE and external supplies (e.g., AC adapters), while maintaining in-rush limiting and DC current regulation across both paths. The error amplifier features 1.25 V reference, 75 dB DC gain, and 10 MHz GBW for stable loop compensation in feedback-controlled SMPS designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Compliance | Fully compliant with IEEE 802.3af detection, classification, UVLO, and in-rush current limits. |
| Hot-swap MOSFET | Integrated 100 V, 0.5 Ω, 800 mA rated MOSFET-enables high-current PD operation beyond standard 350 mA limit. |
| DC Current Limit | Programmable up to 800 mA via DCCL pin resistor-supports Class 4+ high-power PD applications. |
| Oscillator Frequency | Programmable 85–495 kHz via RT pin resistor-allows optimization of magnetics size and efficiency. |
| Soft-start Control | 10 µA internal current source charges external SS capacitor-ensures controlled output voltage ramp-up. |
| Power Good Signal | nPGD active-low output confirms hot-swap completion and SMPS activation-used for system sequencing. |
| Thermal Protection | Two-level shutdown at 130 °C (in-rush phase) and 160 °C (normal operation)-prevents junction damage. |
Pinout & Package
PM8800ATR is housed in a thermally enhanced HTSSOP16 package with exposed pad (EP), optimized for PoE PD board layouts requiring low thermal resistance (RthJA = 50 °C/W on 4-layer demo board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RT | Oscillator timing & sync input | Resistor-to-AGND sets switching frequency; accepts external sync pulses for multi-phase synchronization. |
| 2 SS | Soft-start timing & hiccup timer | External capacitor controls ramp rate; also defines overcurrent hiccup timeout duration. |
| 3 AUXII | Auxiliary source enable | Configures priority between PoE and external supply-determines whether DC/DC starts from PoE or auxiliary rail. |
| 4 VIN | System high-potential input | OR-ed node for PoE and auxiliary inputs-serves as primary high-side rail for hot-swap MOSFET and bias regulator. |
| 5 RCLASS | Classification resistor connection | External resistor sets PD class (Class 0–4); disconnected after classification to minimize standby loss. |
| 7 DCCL | DC current limit programming | Resistor-to-VSS sets continuous current limit-configurable from 390 mA to 800 mA for extended-power PDs. |
| 9 GND | PWM converter return | Drain connection of internal hot-swap MOSFET-must be tied to PCB ground plane for thermal and EMI performance. |
| 10 GD | PWM gate driver output | Drives external N-channel MOSFET gate-800 mA peak source / 1200 mA sink capability supports fast switching. |
| 12 nPGD | Power good indicator | Active-low signal asserts when hot-swap is complete and SMPS is enabled-used for downstream power sequencing. |
| 13 CS | Current sense input | Monitors primary-side current for cycle-by-cycle limiting; 0.5 V threshold triggers GD shutdown. |
| 14 COMP | Error amplifier output / PWM input | Internal 2.5 kΩ pull-up enables optocoupler biasing in isolated feedback loops. |
| 15 VFB | Voltage feedback input | Inverting input of 1.25 V referenced error amplifier-connects to resistive divider for precise output regulation. |
| 16 AGND | Analog ground reference | Return for sensitive analog circuitry (error amp, CS, VFB); must be star-connected to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-source power arbitration | Hardware-controlled switchover between PoE and auxiliary supplies (AC adapter) without external logic or microcontroller. |
| Extended-power PD capability | 800 mA programmable DC current limit exceeds IEEE 802.3af's 350 mA-enables >12.95 W operation per port. |
| Integrated hot-swap MOSFET | 100 V/0.5 Ω/800 mA MOSFET eliminates discrete FET and associated gate drive components-reduces BOM count and layout area. |
| Robust thermal management | Two-tier thermal shutdown (130 °C and 160 °C) with 30 °C hysteresis prevents latch-up and ensures safe recovery. |
| Programmable in-rush control | Adjustable in-rush current limit (120–490 mA) via AUXI_IRL pin resistor-minimizes stress during PoE cable insertion. |
Applications
| VoIP Phones | WLAN Access Points |
|---|---|
|
Use Scenario: Powered via Cat5e/Cat6 Ethernet cabling in enterprise office deployments with centralized PoE switches. IC Role / Device Role / Timing Role: Primary PD interface and DC-DC controller managing 48 V PoE input to regulated 3.3 V/5 V rails for baseband processor, codec, and RF front-end. Use Value: Integrated signature resistor and classification logic eliminate external components; auxiliary source support maintains call continuity during PoE interruption. |
Use Scenario: High-density indoor/outdoor Wi-Fi access points deployed in campuses or smart buildings where PoE simplifies installation. IC Role / Device Role / Timing Role: Dual-role controller handling PoE detection/classification and synchronous buck conversion for 12 V AP radio subsystems. Use Value: 800 mA DC current limit enables concurrent 2.4 GHz + 5 GHz radios and USB peripherals; HTSSOP16 footprint supports compact PCB layout. |
| Security Cameras | High-Power Industrial PDs |
|
Use Scenario: Outdoor PTZ or 4K IP cameras requiring >12.95 W for IR illumination, motor control, and video encoding. IC Role / Device Role / Timing Role: High-current PD interface with auxiliary fallback, driving isolated flyback converter for 12 V camera core and 24 V pan/tilt motors. Use Value: Programmable DCCL and AUXI_IRL allow precise current budgeting across multiple loads; thermal shutdown protects against enclosure overheating. |
Use Scenario: Industrial PoE-powered edge gateways, IoT controllers, or PoE extenders needing >25 W delivered via multi-port PSEs. IC Role / Device Role / Timing Role: Extended-power PD controller supporting dual-input (PoE + 24 V auxiliary) with seamless failover and current-limited startup. Use Value: Hot-swap MOSFET and programmable in-rush prevent upstream PSE tripping; RT pin enables frequency tuning to avoid EMI bands in dense installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PoE PD interface and PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4275AIMSE#PBF | IEEE 802.3af/at-compliant PD interface only-no integrated PWM controller; requires external DC-DC controller. | Suitable for designs using discrete flyback/buck controllers where flexibility in topology selection is prioritized over integration. | Select when modular architecture, independent control loop tuning, or multi-output regulation is required. |
| TPS23754PWPR | Integrated PoE PD + PWM controller but limited to 600 mA DC current limit and no auxiliary source arbitration logic. | Targeted at standard 12.95 W Class 3 applications-lacks extended-power capability and dual-source management. | Select for cost-sensitive, single-source PoE-only systems meeting basic 802.3af requirements. |
Compared with LT4275AIMSE#PBF and TPS23754PWPR, PM8800ATR uniquely combines full 802.3af compliance, 800 mA programmable current limit, hardware-based auxiliary source arbitration, and integrated current-mode PWM-making it optimal for high-power, dual-source PoE appliances where BOM reduction and thermal resilience are critical.
Availability
PM8800ATR is available at Aetrix Electronics and suitable for VoIP phones, security cameras, WLAN access points, and industrial PoE-powered devices requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for PM8800ATR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and communications markets.
The PM8800ATR belongs to ST's PoE PD Interface & Controller product line, engineered specifically to simplify high-power, dual-source powered device designs while maintaining strict IEEE 802.3af compliance and thermal robustness.
FAQ
What is the maximum continuous current supported by the PM8800ATR's integrated hot-swap MOSFET?
The PM8800ATR's integrated hot-swap MOSFET supports up to 800 mA continuous current, programmable via the DCCL pin resistor. This exceeds the IEEE 802.3af standard's 350 mA limit and enables Class 4+ powered devices. The MOSFET has a typical RDS(on) of 0.5 Ω at 100 V, ensuring low conduction losses under full load.
Can the PM8800ATR operate with both PoE and an external AC adapter simultaneously?
Yes-the PM8800ATR supports seamless dual-source operation via dedicated pins: AUXI_IRL configures in-rush behavior and UVLO thresholds for auxiliary input, while AUXII enables priority selection between PoE and external supply. The device automatically manages switchover without external logic, maintaining regulated output during transitions.
How is the oscillator frequency programmed on the PM8800ATR?
Oscillator frequency is set by an external resistor connected between the RT pin and AGND. Typical values include 88 kΩ for ~240 kHz and 33 kΩ for ~440 kHz. The RT pin also accepts narrow ac-coupled synchronization pulses from an external clock, enabling phase-aligned operation in multi-rail systems.
Does the PM8800ATR support isolated DC-DC topologies?
Yes-the PM8800ATR's current-mode PWM controller supports both isolated (e.g., flyback, forward) and non-isolated (e.g., buck) topologies. Its error amplifier includes a 1.25 V reference and 2.5 kΩ internal pull-up on COMP, facilitating optocoupler-based feedback in isolated designs without additional bias circuitry.
PM8800ATR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Controller (PD), DC/DC
- Number of Channels:
- 1
- Power - Max:
- 12.95 W
- Internal Switch(s):
- Both
- Auxiliary Sense:
- No
- Standards:
- 802.3af (PoE)
- Voltage - Supply:
- 48V
- Current - Supply:
- 3mA
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
PM8800ATR FAQ
1.How can I place an order for PM8800ATR through Aetrix?
Please submit a Request for Quotation (RFQ) for PM8800ATR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for PM8800ATR reliable?
The price and inventory of PM8800ATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PM8800ATR is usually 5 days.
3.What payment methods are accepted for PM8800ATR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PM8800ATR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PM8800ATR?
PM8800ATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PM8800ATR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for PM8800ATR?
For technical support, including PM8800ATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PM8800ATR requirements.
6.How does Aetrix verify that PM8800ATR is sourced from the original manufacturer or authorized distributors?
All PM8800ATR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PM8800ATR meets industry standards.
7.What is the process for return or replacement of PM8800ATR?
All PM8800ATR units undergo pre-shipment inspection (PSI). If there is an issue with PM8800ATR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The PM8800ATR part is unused and in its original packaging.
Return procedure for PM8800ATR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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