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STMicroelectronics PM8804TR
- Part No.:
- PM8804TR
- Manufacturer:
- STMicroelectronics
- Category:
- DC DC Switching Controllers
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
PM8804TR.pdf
- Description:
- PWM PEAK CURRENT MODE CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:809
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Product details
Overview
PM8804TR from STMicroelectronics is a PWM peak current mode controller IC designed for 48 V PoE and telecom mid-power DC-DC converters. It integrates dual complementary low-side gate drivers (1 A peak sink), programmable switching frequency up to 1 MHz, internal 20 mA high-voltage startup regulator, and embedded protections including latch-after-4-event overcurrent and thermal shutdown. Used in active-clamp forward and synchronous flyback topologies for IP phones and network cameras.
For engineers reviewing the PM8804TR datasheet, PM8804TR pinout, PM8804TR application, or PM8804TR equivalent, key selection considerations include programmable dead time (10–200 ns), current sense blanking (10–200 ns), soft-start timing control, VC pin UV/OV protection thresholds, and GAT2 disable capability via MODE pin.
Technical Context
The PM8804TR implements peak current mode control with internal slope compensation enabling stable operation up to 80% duty cycle. Its oscillator uses an external resistor on FSW to set frequency from 100 kHz to 1 MHz, with typical accuracy ±10% across temperature.
It features two independent timing control paths: DT pin sets GAT1-to-GAT2 delay (10–200 ns) using a resistor, while BLK pin configures current-sense blanking time (10–200 ns) to suppress leading-edge spikes. Both require mandatory resistor termination to AGND for functional operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 10 V to 75 V - supports direct connection to rectified PoE 48 V supply with margin for transients. |
| Switching frequency | 100 kHz to 1 MHz - set by external RFSW; enables optimization of magnetics size vs. efficiency trade-off. |
| Gate driver output | 1 A peak sink / 0.8 A source - drives MOSFETs with ≤5 Ω gate resistance in high-current forward or active-clamp topologies. |
| Current sense threshold | 0.22–0.28 V (cycle-by-cycle) - precise overcurrent detection with programmable blanking to reject noise. |
| Startup regulator | 8.0 V ±0.4 V @ 20 mA typ. - powers internal circuitry during startup; shuts off when auxiliary winding exceeds 8.3 V. |
| Thermal shutdown | 160 °C with 30 °C hysteresis - protects against sustained overload or poor PCB thermal design. |
| Soft-start time | 16.5 ms (typ.) with 33 nF capacitor - controls inrush current and prevents output overshoot during power-up. |
Pinout & Package
PM8804TR is housed in a VFQFPN 3.0 × 3.0 × 1.0 mm, 16-lead package with 0.5 mm pitch and exposed thermal pad (EP) connected to AGND. The compact thermally enhanced layout supports high-density PoE power designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 10, EP | AGND / PGND / Exposed Pad | Star-ground connection point for analog and power return paths; EP must be soldered to AGND copper for thermal dissipation. |
| 2 (SS) | Soft-start timing | Capacitor-to-AGND sets controlled ramp-up of CTL voltage; pre-charged at 10 µA before main charge phase. |
| 3 (DT) | Gate driver delay control | Resistor-to-AGND programs 10–200 ns delay between GAT1 and GAT2 edges; open-circuit disables operation. |
| 4 (FSW) | Oscillator frequency set | Resistor-to-AGND selects 100–1000 kHz switching frequency; accuracy ±10% over temperature. |
| 6 (PGD) | Power Good status | Active-high enable signal; de-assertion freezes GAT1/GAT2 outputs and halts converter operation. |
| 8 (VIN) | High-voltage input | Accepts up to 75 V DC; powers internal HV regulator and supplies gate drivers via VC pin. |
| 9 (GAT1) | Main gate driver output | 1 A sink / 0.8 A source drive for primary-side MOSFET; includes rise/fall times < 50 ns with 3.3 nF load. |
| 11 (GAT2) | Auxiliary gate driver output | Complementary to GAT1; configurable via MODE pin for active clamp or synchronous rectification. |
| 12 (VC) | HV regulator output | 8.0 V regulated supply; monitors UVLO (5.0 V) and OV (15.3 V); requires ≥2.2 µF ceramic capacitor. |
| 13 (MODE) | Operation mode select | Pulled up internally; tie to AGND to disable GAT2 and soft-turn-off for simple flyback use cases. |
| 14 (CS) | Current sense input | Detects primary current via shunt; blanked for 10–200 ns after GAT1 turn-on to reject switching noise. |
| 15 (CTL) | PWM comparator input | 0.7–1.7 V operating range; internal 3.3 kΩ pull-up enables optocoupler biasing in isolated feedback loops. |
| 16 (BLK) | Blanking time control | Resistor-to-AGND sets current-sense blanking duration; open-circuit causes functional halt. |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary gate drivers | GAT1 and GAT2 support interleaved or complementary switching with user-programmable dead time (10–200 ns). |
| Programmable blanking & delay | Independent resistor-based tuning of CS blanking and GAT1/GAT2 delay ensures robust noise immunity at high frequencies. |
| Integrated HV startup regulator | 20 mA capable linear regulator eliminates need for external bias supply in PoE-powered devices during cold start. |
| Multi-level protection suite | Includes cycle-by-cycle current limit, delayed overload restart, VC disconnection detection, and thermal shutdown with hysteresis. |
| Optocoupler-ready CTL interface | Internal 3.3 kΩ pull-up resistor simplifies isolated feedback implementation without external bias components. |
Applications
| IP Phone Power Supply | WLAN Access Point PSU |
|---|---|
|
Use Scenario: 48 V PoE-powered VoIP phone requiring compact, self-protected 3.3 V/5 V rail generation. IC Role / Device Role / Timing Role: Primary-side PWM controller managing active-clamp forward topology with synchronous rectification. Use Value: Dual gate drivers and programmable dead time enable efficient zero-voltage switching, reducing MOSFET losses and EMI. |
Use Scenario: Mid-power 48 V input telecom-grade PSU for dual-band 802.11ac access points with strict thermal limits. IC Role / Device Role / Timing Role: Peak current mode controller coordinating GAT1/GAT2 for active-clamp flyback with 500 kHz switching. Use Value: Internal slope compensation and 80% max duty cycle ensure stability under wide load and line variations. |
| Network Camera DC-DC | Industrial Telecom Adapter |
|
Use Scenario: Outdoor PoE camera needing reliable startup under cold ambient and transient-heavy 48 V input. IC Role / Device Role / Timing Role: Controller with HV startup regulator and VC UV/OV monitoring for autonomous fault recovery. Use Value: Latch-after-4-event OCP prevents catastrophic failure during short-circuit events without manual reset. |
Use Scenario: DIN-rail mounted telecom adapter converting 48 V to ±12 V rails for legacy equipment interfaces. IC Role / Device Role / Timing Role: Dual-output forward controller using GAT1 for main switch and GAT2 for active-clamp switch. Use Value: Programmable soft-start (16.5 ms typ.) limits inrush into large output capacitors and avoids bus droop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28950 | Fixed 100–1000 kHz frequency range; no integrated HV startup regulator; requires external bias supply. | Targets higher-power telecom systems where external bias is already available; lacks VC UV/OV protection. | Choose UCC28950 only if external 12 V bias is present and thermal design accommodates higher driver losses. |
| NCP1399 | Resonant LLC controller; no current-mode sensing; no dual gate drivers; operates at fixed 200–700 kHz. | Designed for resonant topologies only; unsuitable for PoE flyback/forward due to lack of peak current control. | Select NCP1399 only for high-efficiency LLC designs where ZVS operation is prioritized over PoE-specific protections. |
Compared with UCC28950 and NCP1399, PM8804TR uniquely combines PoE-optimized HV startup, dual gate drivers with programmable dead time, and integrated VC monitoring-making it the only choice for compact, self-contained 48 V mid-power converters requiring latch-off OCP and thermal hysteresis.
Availability
PM8804TR is available at Aetrix Electronics and suitable for PoE-powered IP phones, WLAN access points, and network cameras requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for PM8804TR 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, delivering innovative analog, power, and microcontroller solutions for industrial, automotive, and communications markets.
The PM8804TR belongs to ST's PoE and Telecom Power Controllers product line, engineered specifically for robust, compact, and self-protected 48 V DC-DC conversion in IEEE 802.3af/at-compliant powered devices.
FAQ
What is the minimum recommended capacitor value for the VC pin?
A minimum 2.2 µF ceramic capacitor rated for 25 V must be placed directly between VC and AGND to stabilize the internal high-voltage regulator. Larger values (e.g., 4.7 µF) are advised for applications drawing >10 mA from VC or operating under high ambient temperature to prevent startup failure.
Can GAT2 be disabled while retaining soft-start functionality?
Yes. Connecting MODE to AGND disables GAT2 and also disables soft-turn-off, but soft-start remains fully operational via the SS pin capacitor. This configuration is ideal for single-switch flyback designs where only GAT1 is used and soft-stop is unnecessary.
How does the PM8804TR handle overvoltage on the VC pin?
When VC exceeds 15.3 V (OV rising threshold), the controller stops switching, discharges the soft-start capacitor, and attempts automatic restart. After four failed attempts, it latches off until VIN is cycled. This protects against auxiliary winding faults or feedback loop failures in isolated topologies.
Is the BLK pin required to be terminated even in basic flyback configurations?
Yes. The BLK pin must always be connected to AGND via a resistor (20–390 kΩ) to set blanking time between 10–200 ns. Leaving BLK open disables device operation - this applies regardless of topology, as blanking is essential to prevent false overcurrent triggering on MOSFET turn-on spikes.
PM8804TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- *
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Output Type:
- -
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Number of Outputs:
- -
- Output Phases:
- -
- Voltage - Supply (Vcc/Vdd):
- -
- Frequency - Switching:
- -
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- -
- Clock Sync:
- -
- Serial Interfaces:
- -
- Control Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-VFQFPN (3x3)
PM8804TR FAQ
1.How can I place an order for PM8804TR through Aetrix?
Please submit a Request for Quotation (RFQ) for PM8804TR 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 PM8804TR reliable?
The price and inventory of PM8804TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PM8804TR is usually 5 days.
3.What payment methods are accepted for PM8804TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PM8804TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PM8804TR?
PM8804TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PM8804TR 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 PM8804TR?
For technical support, including PM8804TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PM8804TR requirements.
6.How does Aetrix verify that PM8804TR is sourced from the original manufacturer or authorized distributors?
All PM8804TR 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 PM8804TR meets industry standards.
7.What is the process for return or replacement of PM8804TR?
All PM8804TR units undergo pre-shipment inspection (PSI). If there is an issue with PM8804TR, 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 PM8804TR part is unused and in its original packaging.
Return procedure for PM8804TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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