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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Over Ethernet (PoE) Controllers

STMicroelectronics PM8800A

Name: PM8800A
Brand: STMicroelectronics
SKU: PM8800A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PM8800A

Manufacturer:: STMicroelectronics

Category:: Power Over Ethernet (PoE) Controllers

Package:: 16-TSSOP (0.173", 4.40mm Width) Exposed Pad

Datasheet:: PM8800A.pdf

Description:: IC POE CNTRL 1 CHANNEL 16HTSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PM8800A from STMicroelectronics is an integrated IEEE 802.3af-compliant Power over Ethernet (PoE) Powered Device (PD) interface and current-mode PWM controller in HTSSOP16 package. It delivers up to 800 mA DC current limit, integrates a 100 V/0.5 Ω hot-swap MOSFET, and supports dual-input operation (PoE + auxiliary source) for VoIP phones, security cameras, and high-power (>12.95 W) PD appliances.

For engineers reviewing the PM8800A datasheet, PM8800A pinout, PM8800A application, or PM8800A equivalent, key selection considerations include programmable in-rush and DC current limits, isolated/non-isolated SMPS compatibility, thermal shutdown thresholds (130 °C / 160 °C), and dual-source enable logic via AUXI_IRL and AUXII pins.

Technical Context

The PM8800A implements a state-machine-driven PD interface with detection (24.5 kΩ signature resistor), classification (programmable current via RCLASS), UVLO (38.5 V release / 31.5 V lockout), and hot-swap control using an integrated 100 V MOSFET. Its in-rush current limiting uses constant-power methodology with external resistor programming.

The embedded current-mode PWM controller features programmable oscillator frequency (85–495 kHz via RT), 80% max duty cycle with internal slope compensation, soft-start (10 µA charge/discharge current), and cycle-by-cycle overcurrent protection triggered at 0.5 V on CS pin. The error amplifier has 1.25 V reference, 75 dB DC gain, and 10 MHz GBW for stable loop compensation.

Key Specifications

Parameter	Value and Actual Design Meaning
IEEE Compliance	Fully compliant with IEEE 802.3af PD interface requirements including detection, classification, UVLO, and in-rush control.
DC Current Limit	Programmable up to 800 mA via DCCL pin resistor - exceeds 802.3af's 350 mA limit for high-power PDs.
Oscillator Frequency	85–495 kHz programmable via RT pin resistor; supports external sync pulses for system-level timing coordination.
Hot-swap MOSFET	Integrated 100 V, 0.5 Ω, 800 mA rated MOSFET - reduces BOM count and conduction losses in PoE input stage.
Thermal Protection	Two-level shutdown: 130 °C (in-rush phase only) and 160 °C (full operation), with 30 °C hysteresis for reliable recovery.
Power Good Signal	nPGD active-low output confirms hot-swap completion and SMPS activation - used for downstream power sequencing.
Feedback Reference	Internal 1.25 V precision reference at VFB pin - enables accurate output voltage regulation in buck or flyback topologies.

Pinout & Package

Package: HTSSOP16 (Heat Sink Thermally Enhanced Small Outline Package, 16-pin, exposed pad). Thermal resistance R_thJA = 50 °C/W on 4-layer demo board; exposed pad must be connected to VSS for optimal heat dissipation.

Pin/Terminal	Circuit Role	Design Meaning
1 RT	Oscillator timing & sync input	Resistor-to-AGND sets switching frequency; accepts narrow AC-coupled sync pulses for master-slave synchronization.
2 SS	Soft-start & hiccup timer	10 µA internal current source charges external capacitor; also configures hiccup timeout after overcurrent fault.
3 AUXII	Auxiliary source enable	Controls priority between PoE and external supply - resistor value determines whether auxiliary source overrides PoE.
4 VIN	High-side input node	"OR" node for PoE and auxiliary sources; withstands up to 100 V - accommodates PoE voltage transients and adapter surges.
5 RCLASS	Classification current setting	Connects external resistor to VSS to program classification current per IEEE 802.3af Class 0–4; disconnected post-classification.
7 DCCL	DC current limit programming	Resistor-to-VSS sets sustained current limit (up to 800 mA); open for standard 350 mA 802.3af mode.
10 GD	PWM gate driver output	Drives external N-channel MOSFET gate with 800 mA peak source / 1200 mA peak sink capability and 35 ns rise/fall times.
12 nPGD	Power good indicator	Active-low open-drain signal asserts when hot-swap completes and SMPS enters regulation - used for system power sequencing.
13 CS	Current sense input	Monitors primary-side current; 0.5 V threshold triggers cycle-by-cycle limiting; includes 80 ns leading-edge blanking.
14 COMP	Error amplifier output / PWM input	Provides loop compensation node; internal 2.5 kΩ pull-up supports optocoupler biasing in isolated feedback designs.
15 VFB	Voltage feedback input	Inverting input of error amplifier referenced to 1.25 V - enables precise output regulation in buck, flyback, or forward converters.
16 AGND	Analog ground reference	Return for sensitive analog circuitry (error amp, CS comparator, oscillators); must be tied to GND for noise immunity.

Key Features

Feature	Design Value
Dual-input power management	Seamlessly selects between PoE and auxiliary sources (e.g., AC adapter) using AUXI_IRL and AUXII pins - ensures uninterrupted operation during PoE loss.
Programmable high-current interface	DC current limit adjustable from 350 mA to 800 mA via DCCL pin - supports emerging >12.95 W PD applications beyond 802.3af baseline.
Integrated hot-swap MOSFET	On-chip 100 V, 0.5 Ω MOSFET eliminates discrete FET and associated gate drive components - reduces layout complexity and failure points.
Robust thermal protection	Two-tier thermal shutdown (130 °C for in-rush, 160 °C for steady-state) with 30 °C hysteresis - prevents latch-up and enables safe auto-recovery.
Flexible SMPS control	Current-mode PWM with programmable frequency, 80% max duty cycle, slope compensation, and soft-start - supports isolated (flyback) and non-isolated (buck) topologies.

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: PD interface + SMPS controller managing 48 V PoE input to regulated 3.3 V/5 V rails for baseband processor, codec, and RF section.

Use Value: Eliminates need for local wall adapter; integrated hot-swap MOSFET and programmable in-rush limit prevent PSE port shutdown during plug-in events.

Use Scenario: High-density indoor/outdoor wireless infrastructure requiring reliable remote power without AC outlets.

IC Role / Device Role / Timing Role: Dual-source PD controller enabling seamless failover from PoE to 12 V auxiliary supply during network maintenance or cable faults.

Use Value: AUXI_IRL and AUXII pins allow dynamic source arbitration - maintains AP uptime and avoids service interruption during PoE downtime.

IP Security Cameras

High-Power PD Appliances

Use Scenario: Outdoor PTZ cameras with IR illumination and heater elements demanding >12.95 W PoE power.

IC Role / Device Role / Timing Role: High-current PD interface delivering up to 800 mA while regulating 12 V/24 V outputs for motor, sensor, and imaging subsystems.

Use Value: Programmable DCCL pin enables 800 mA sustained current - supports IEEE 802.3at-like performance using single-chip solution without external current boosters.

Use Scenario: Industrial IoT gateways, digital signage, or thin clients requiring robust PoE+ compatibility with auxiliary backup.

IC Role / Device Role / Timing Role: Integrated PD + PWM controller handling both detection/classification and isolated flyback conversion for multiple output rails.

Use Value: HTSSOP16 package with exposed pad provides thermal headroom for continuous 15–20 W operation; VFB/COMP architecture simplifies opto-coupled feedback design.

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
LT4275A	Single-chip IEEE 802.3af PD interface only - no integrated PWM controller; requires external DC-DC controller.	Suitable for designs where SMPS topology and control are already defined; adds component count but offers greater flexibility in converter design.	Select LT4275A when modular separation of PD interface and SMPS control is preferred, or when higher PWM frequency (>1 MHz) is required.
TPS23754	Integrates PoE PD interface + synchronous buck controller (not current-mode); fixed 600 kHz frequency; no external RT programming.	Optimized for non-isolated buck-only applications; lacks isolated topology support and programmable current limit beyond 600 mA.	Choose TPS23754 for cost-sensitive, low-component-count buck-powered devices where isolation and >600 mA current are not required.

Compared with LT4275A and TPS23754, the PM8800A uniquely combines full 802.3af compliance, programmable 800 mA DC current limit, current-mode PWM with RT-based frequency tuning, and native support for both isolated and non-isolated topologies - making it optimal for compact, high-power, dual-source PD designs.

Availability

PM8800A is available at Aetrix Electronics and suitable for VoIP phones, security cameras, WLAN access points, and industrial IoT gateways requiring stable component supply, long-term lifecycle assurance, and dual-input PoE resilience.

Supply support for PM8800A 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, specializing in power management, analog, microcontrollers, and automotive ICs.

The PM8800A belongs to ST's PoE PD interface product line, designed specifically to simplify high-power powered device implementation by integrating detection, classification, hot-swap control, and flexible SMPS regulation in a single HTSSOP16 package.

FAQ

What is the maximum continuous current the PM8800A can deliver through its integrated hot-swap MOSFET?

The PM8800A supports a programmable DC current limit up to 800 mA via the DCCL pin resistor. This exceeds the IEEE 802.3af standard's 350 mA limit and enables use in high-power PD applications such as PTZ security cameras and industrial gateways. The MOSFET itself is rated for 100 V and 0.5 Ω R_DS(on), with thermal shutdown protecting against sustained overload.

Can the PM8800A operate with both PoE and an external DC adapter simultaneously?

Yes - the PM8800A supports automatic source arbitration between PoE and auxiliary supplies using AUXI_IRL and AUXII pins. When an auxiliary source is present, these pins configure the internal logic to prioritize or supplement PoE power, enabling seamless failover and eliminating downtime during PoE interruptions. No external OR-ing diodes or controllers are needed.

Does the PM8800A support isolated DC-DC topologies like flyback?

Yes - the integrated current-mode PWM controller supports both isolated and non-isolated configurations. Its VFB pin connects to the optocoupler secondary in flyback designs, while COMP provides the error amplifier output for primary-side compensation. The 1.25 V internal reference, 75 dB DC gain, and 10 MHz GBW ensure stable regulation across load and line variations in isolated topologies.

How is the oscillator frequency programmed, and what is its operational range?

Oscillator frequency is set by an external resistor from RT pin to AGND, supporting 85–495 kHz. With RT open, f_osc = 100 kHz (typ); with RT = 33 kΩ, f_osc ≈ 440 kHz (typ); with RT = 88 kΩ, f_osc ≈ 240 kHz (typ). The RT pin also accepts external sync pulses (≥50 ns, ≥2.8 V), enabling synchronized multi-converter systems without frequency beating.

PM8800A Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 16-TSSOP (0.173", 4.40mm Width) Exposed Pad

Packaging:: Tube

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

PM8800A FAQ

1.How can I place an order for PM8800A through Aetrix?

Please submit a Request for Quotation (RFQ) for PM8800A 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 PM8800A reliable?

The price and inventory of PM8800A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PM8800A is usually 5 days.

3.What payment methods are accepted for PM8800A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PM8800A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PM8800A?

PM8800A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PM8800A 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 PM8800A?

For technical support, including PM8800A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PM8800A requirements.

6.How does Aetrix verify that PM8800A is sourced from the original manufacturer or authorized distributors?

All PM8800A 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 PM8800A meets industry standards.

7.What is the process for return or replacement of PM8800A?

All PM8800A units undergo pre-shipment inspection (PSI). If there is an issue with PM8800A, 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 PM8800A part is unused and in its original packaging.

Return procedure for PM8800A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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