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Monolithic Power Systems Inc. MP8001DS-LF
- Part No.:
- MP8001DS-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP8001DS-LF.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,888
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Product details
Overview
MP8001DS-LF from Monolithic Power Systems is an IEEE 802.3af-compliant Powered Device (PD) controller for Power over Ethernet systems, integrating a 100V, 1.2Ω DMOS pass device, 420mA current limit, thermal shutdown at 135°C, and open-drain Power Good output. It enables safe detection, classification, and inrush-limited power delivery to VoIP phones and security cameras.
For engineers reviewing the MP8001DS-LF datasheet, MP8001DS-LF pinout, MP8001DS-LF application, or MP8001DS-LF equivalent, key selection criteria include its 420mA current limit (vs. 810mA for MP8001A), SOIC-8 package with validated 8-pin terminal mapping, -40°C to +85°C operating range, and compliance with PoE detection/classification thresholds per IEEE 802.3af.
Technical Context
The MP8001DS-LF implements full IEEE 802.3af PD functionality: 26.1kΩ detection resistance sensing, 10.2–13V classification turn-on threshold, and 21–23V turn-off threshold. Its internal 100V DMOS switch supports up to 57V input with thermally compensated current limiting.
It features programmable inrush current control via RILIM, a latched Power Good output with 9.5–10.5V rising-edge threshold and 1.2V falling-edge reset, and UVLO activation at 38–42V (including 1.4V diode drop). Thermal protection uses foldback current reduction and an 8-event counter before latch-off.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Threshold | 1.9V on, 11V off with 0.2V hysteresis - ensures reliable PSE handshake under cable voltage drop |
| Classification Range | 10.2–13V turn-on, 21–23V turn-off - defines valid PoE negotiation window per IEEE 802.3af |
| Current Limit | 420mA typical - sets maximum continuous load current for 15W-class PD designs |
| Pass Device RDS(ON) | 1.0–1.2Ω - determines conduction loss and thermal rise during sustained operation |
| Thermal Shutdown | 135°C with 40°C hysteresis - prevents permanent damage during overload or short-circuit events |
| Power Good Threshold | 9.5–10.5V rising, 1.2V falling - provides stable enable signal for downstream DC-DC converter startup |
| UVLO Threshold | 38–42V rising, 30.2–32.8V falling - ensures clean start-up only after stable PoE supply is established |
Pinout & Package
MP8001DS-LF is housed in a standard SOIC-8 package (JEDEC MS-012, variation AA), with 1.27mm pitch, 3.90mm width, and exposed pad not present. Pin 1 is marked by a notch or dot; pin 7 is NC (no connect), used only for post-package trim.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 ILIM | Inrush Current Limit Set | Connects to resistor setting inrush charge rate; determines soft-start duration and peak input capacitor charging current |
| 2 CLASS | Classification Resistor Input | Accepts external resistor defining PD power class (e.g., 4.42kΩ = Class 1); sets classification current draw |
| 3 DET | Detection Resistor Input | Connects to 26.1kΩ resistor presenting IEEE-mandated detection signature to PSE |
| 4 GND | Negative Power Supply Reference | Internal bias ground; must be tied to system common return for accurate current sensing and regulation |
| 5 RTN | Powered Device Return Path | Carries full load current back to PSE; routed separately from GND to avoid sensing error |
| 6 PGOOD | Open-Drain Power Good Output | Sinks current when VRTN ≥9.5V; used to enable downstream converters after stable input is confirmed |
| 7 NC | No Connect | Not internally bonded; left floating or grounded per layout best practice; no electrical function |
| 8 VDD | PoE Input Supply Terminal | Accepts 0–57V PoE input; includes integrated 100V DMOS switch and UVLO circuitry |
Key Features
| Feature | Design Value |
|---|---|
| IEEE 802.3af Compliance | Fully implements detection (26.1kΩ), classification (10–11V window), and power handoff - eliminates need for external protocol logic |
| Integrated 100V DMOS Switch | Replaces discrete high-voltage MOSFET and gate driver - reduces BOM count and layout complexity in PoE front-end |
| Programmable Inrush Limiting | RILIM resistor sets controlled capacitor charging current - prevents PSE trip and die overheating during startup |
| Thermal Foldback Protection | Reduces output current above 135°C instead of hard shutdown - maintains partial operation during transient overload |
| Latched Power Good Output | Stays low until VRTN exceeds 9.5V and remains latched low if VRTN drops below 1.2V - ensures robust downstream converter sequencing |
Applications
| VoIP Telephones | Network Interface Cards |
|---|---|
Use Scenario: Desktop IP phone drawing power and data over single Cat5e cable in enterprise LAN. IC Role / Device Role / Timing Role: PD controller managing detection, classification, and regulated 48V-to-3.3V/5V conversion enable sequence. Use Value: Enables Class 1 (up to 15.4W) operation with guaranteed 420mA current limit and thermal foldback - avoids PSE rejection and ensures call continuity during ambient temperature spikes. | Use Scenario: PCIe or USB-based network adapter requiring plug-and-play PoE connectivity without auxiliary power. IC Role / Device Role / Timing Role: Front-end PD interface handling IEEE 802.3af handshake and providing clean enable signal to isolated DC-DC converter. Use Value: Delivers deterministic 10.2–13V classification window and 75–225μs PG deglitch - prevents false enable/disable toggling during Ethernet cable insertion transients. |
| Security Camera Systems | Safety Backup Power |
Use Scenario: Outdoor PTZ camera with heater and IR illuminator powered via PoE in unconditioned environments. IC Role / Device Role / Timing Role: High-reliability PD controller supporting extended temperature range (-40°C to +85°C) and thermal fault recovery. Use Value: Provides 135°C thermal shutdown with 40°C hysteresis and 8-event counter - allows graceful degradation rather than immediate lockout during sustained high-load operation. | Use Scenario: Emergency lighting or access control panel requiring fail-safe PoE-powered backup during AC mains outage. IC Role / Device Role / Timing Role: Safety-critical PD interface ensuring compliant detection signature and latched Power Good assertion only after stable input. Use Value: Guarantees 9.5–10.5V PG rising threshold and 1.2V falling reset - prevents downstream regulator brownout during PoE source fluctuation or cable fault. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Powered Device controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP8001ADS-LF | 810mA current limit (vs. 420mA), same SOIC-8 package and pinout | Supports Class 2 (up to 30W) loads; requires higher RILIM for equivalent inrush control | Select when downstream DC-DC converter demands >420mA continuous input current |
| LT4275IMS#PBF | IEEE 802.3at/af dual-mode, 100V/0.8Ω pass device, 550mA limit, MSOP-10 package | Enables higher-power PoE+ operation; different pin count and layout footprint | Select when future-proofing for 802.3at compatibility or needing lower RDS(ON) |
Compared with MP8001ADS-LF and LT4275IMS#PBF, MP8001DS-LF offers optimal cost and thermal performance for fixed 15W-class applications, with simpler inrush programming and smaller SOIC-8 footprint - ideal where PoE+ is unnecessary and board space is constrained.
Availability
MP8001DS-LF is available at Aetrix Electronics and suitable for VoIP telephony, security camera systems, network interface cards, and safety-critical backup power applications requiring stable component supply across industrial temperature ranges.
Supply support for MP8001DS-LF 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
Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, headquartered in Kirkland, WA, with global design and support operations.
The MP8001 product line delivers integrated PoE PD controllers targeting cost-sensitive, space-constrained Ethernet-powered devices - designed specifically to replace discrete detection/classification circuits while maintaining full IEEE 802.3af compliance.
FAQ
What is the maximum input voltage rating for MP8001DS-LF?
The MP8001DS-LF supports absolute maximum input voltage of +100V on VDD and RTN pins, with recommended operating input up to 57V per IEEE 802.3af. This 100V rating accommodates transient surges and legacy PSE implementations while maintaining safe operation within PoE specifications.
How does the ILIM pin function in startup control?
The ILIM pin connects to a resistor that sets the inrush current limit during input capacitor charging. With RILIM = 178kΩ, MP8001DS-LF limits inrush to 120–200mA, preventing PSE current-limit tripping and die overheating. The value directly scales the charging current, enabling precise soft-start tuning for varying capacitance values.
Is pin 7 (NC) required to be left floating?
Yes, pin 7 is designated NC (No Connect) and is not internally bonded. It may be left floating or tied to GND per PCB layout best practices to minimize noise coupling, but it must never be connected to any active signal or voltage rail, as it serves no functional purpose in normal operation.
What defines the difference between MP8001DS-LF and MP8001ADS-LF?
The core difference is current limit: MP8001DS-LF is rated for 420mA (Class 1), while MP8001ADS-LF supports 810mA (Class 2). Both share identical SOIC-8 packaging, pinout, detection/classification thresholds, and thermal protection architecture - making them drop-in replacements except for current capability and associated RILIM/RCLASS resistor values.
Does MP8001DS-LF support IEEE 802.3at (PoE+)?
No, MP8001DS-LF is certified only for IEEE 802.3af (PoE). It lacks the dual-signature detection, higher classification current ranges, and 30W power-handling capability required for 802.3at. For PoE+ compatibility, MPS recommends the MP8007 or MPQ8007 series, which support both af and at standards.
How is thermal protection implemented during overload?
MP8001DS-LF uses thermal foldback: when junction temperature reaches 135°C, it progressively reduces output current instead of shutting down immediately. If the condition persists, an 8-event thermal counter triggers latch-off. Recovery requires cycling the input voltage - this dual-stage approach protects both the IC and upstream PSE during sustained overload or short-circuit faults.
Can MP8001DS-LF be used with non-standard detection resistances?
No - MP8001DS-LF expects a 26.1kΩ detection resistor on the DET pin to meet IEEE 802.3af specification. Deviating from this value risks PSE rejection during detection phase. The device does not support programmable or adaptive detection signatures; compliance depends strictly on external resistor accuracy and stability.
MP8001DS-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Controller (PD)
- Number of Channels:
- 1
- Power - Max:
- -
- Internal Switch(s):
- Yes
- Auxiliary Sense:
- -
- Standards:
- 802.3af (PoE)
- Voltage - Supply:
- 0V ~ 57V
- Current - Supply:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MP8001DS-LF FAQ
1.How can I place an order for MP8001DS-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP8001DS-LF 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 MP8001DS-LF reliable?
The price and inventory of MP8001DS-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP8001DS-LF is usually 5 days.
3.What payment methods are accepted for MP8001DS-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP8001DS-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP8001DS-LF?
MP8001DS-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP8001DS-LF 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 MP8001DS-LF?
For technical support, including MP8001DS-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP8001DS-LF requirements.
6.How does Aetrix verify that MP8001DS-LF is sourced from the original manufacturer or authorized distributors?
All MP8001DS-LF 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 MP8001DS-LF meets industry standards.
7.What is the process for return or replacement of MP8001DS-LF?
All MP8001DS-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP8001DS-LF, 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 MP8001DS-LF part is unused and in its original packaging.
Return procedure for MP8001DS-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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