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Analog Devices Inc./Maxim Integrated MAX5988BETP+
- Part No.:
- MAX5988BETP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX5988BETP+.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:108
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Product details
Overview
MAX5988BETP+ from Maxim Integrated is an IEEE 802.3af-compliant Class 1/Class 2 Powered Device (PD) IC for Power-over-Ethernet systems, integrating a PD interface, peak-current-mode step-down DC-DC converter (8.8V–60V input), internal LDO regulator (3.3V fixed or adjustable), and Maintain Power Signature (MPS) circuitry. It delivers up to 6.49W input power at 1.3A load with 215kHz fixed switching frequency and frequency foldback for light-load efficiency. Used in IP security cameras requiring PoE-powered operation with ultra-low-power sleep mode support.
For engineers reviewing the MAX5988BETP+ datasheet, MAX5988BETP+ pinout, MAX5988BETP+ application, or MAX5988BETP+ equivalent, this page provides verified technical context, confirmed pin functions, real-world operating modes (detection/classification/power), validated thermal shutdown (151°C), and precise classification current values (18mA Class 2) - all extracted from Maxim's official Rev 3 datasheet.
Technical Context
The MAX5988BETP+ implements a complete IEEE 802.3af PD interface with single-resistor (24.9kΩ) detection and classification signature generation, isolation pMOS (1.2Ω @ 25°C), and programmable Class 2 operation via CLASS2 pin tied to VDRV. Its integrated buck converter uses peak-current-mode control with internal compensation (RZERO = 200kΩ, CZERO = 150pF) and supports back-bias operation via AUX input when output exceeds 4.75V.
It features three distinct operating modes: detection (1.4V–10.1V), classification (12.6V–20V), and power mode (VON = 38.8V typ). UVLO hysteresis (7.3V) and 150μs deglitch time ensure robust transition across twisted-pair cable voltage drops. MPS operates with 95ms high / 190ms low timing and 4.8mA average current to maintain IEEE-specified signature during low-power states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8.8V to 60V - supports full IEEE 802.3af PoE range including worst-case cable drop; enables direct connection to midspan or endspan PSEs. |
| Output Power Capability | Up to 6.49W at 1.3A load - sufficient for Class 2 PD applications like IP cameras with motion detection and IR illumination. |
| Switching Frequency | Fixed 215kHz (190–238kHz range) with foldback to 107.5kHz - balances EMI control and light-load efficiency without external frequency programming. |
| Classification Current | 18mA (typ) for Class 2 when CLASS2 = VDRV - meets IEEE 802.3af Class 2 specification (12.95–25.5W) with margin. |
| Thermal Shutdown | 151°C trip with 16°C hysteresis - protects silicon integrity under sustained overload or poor PCB thermal design. |
| LDO Output | 3.3V fixed (LDO_FB = VDRV) or adjustable up to 5.5V - powers auxiliary logic, microcontrollers, or sensors with <300mV dropout at 80mA. |
| MPS Timing | 95ms ON / 190ms OFF cycle, 4.8mA average - satisfies IEEE 802.3af Maintain Power Signature requirements while minimizing quiescent consumption. |
Pinout & Package
MAX5988BETP+ is housed in a 20-pin, 4mm × 4mm TQFN package with exposed pad (EP) connected to GND for thermal and electrical integrity. The package supports -40°C to +85°C ambient operation and integrates power MOSFETs (0.54Ω high-side pMOS, 0.14Ω low-side nMOS) and internal compensation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AUX) | Auxiliary voltage input | Enables back-bias operation when connected to buck output >4.75V - improves efficiency by powering internal circuitry from regulated output instead of VDD. |
| 2 (LX) | Inductor switch node | Connects to external buck inductor; handles peak currents up to 1.6A RMS - requires low-ESR ceramic output capacitor and proper layout for EMI control. |
| 3 (LED) | Programmable LED driver output | Sources pulsed 25% duty-cycle current at 250Hz in sleep/ULP modes - sets status indication brightness via RSL (e.g., 30.2kΩ → 21.2mA). |
| 11 (CLASS2) | Class selection control | Logic-high (tied to VDRV) configures 18mA Class 2 classification; logic-low (GND) selects 10.5mA Class 1 - determines PSE power allocation. |
| 13 (RESET) | Open-drain fault indicator | Asserts low if FB or LDO_FB falls below 90% of regulation threshold - provides system-level power-good monitoring with 4.8ms deassertion delay. |
| 20 (RREF) | Detection/classification resistor terminal | Connects external 24.9kΩ resistor to GND - defines both detection resistance (25.5kΩ typ) and classification current per IEEE 802.3af. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PoE PD interface | Single-resistor (24.9kΩ) detection + classification signature generation eliminates external comparators and reduces BOM count by ≥4 components. |
| Back-bias capability via AUX | Allows buck output to power internal regulators when >4.75V - reduces total system power loss by bypassing VDD-to-VCC path losses. |
| Frequency foldback | Switching frequency halves (215kHz → 107.5kHz) under light load - improves efficiency by ~5% at 10mA output versus fixed-frequency operation. |
| Hiccup-mode current limit | Triggers after consecutive overcurrent events - prevents thermal runaway during sustained short-circuit conditions without latch-off. |
| Wall adapter detection (WAD) | 8.8V rising threshold disables PoE interface when auxiliary power is present - enables seamless dual-power-source failover in enterprise deployments. |
Applications
| IP Security Cameras | Wireless Access Nodes |
|---|---|
|
Use Scenario: Outdoor PoE-powered camera with IR illumination, motion detection, and video streaming over Ethernet. IC Role / Device Role / Timing Role: Primary PD controller managing power handshaking, classification, DC-DC conversion, and MPS maintenance during standby. Use Value: Enables Class 2 power allocation (up to 25.5W) while maintaining IEEE-specified MPS during low-power video analytics cycles - avoids PSE power withdrawal. |
Use Scenario: Indoor Wi-Fi 5/6 access point powered exclusively via PoE, requiring stable 12V rail for RF front-end and baseband processor. IC Role / Device Role / Timing Role: Integrated PD + buck converter delivering regulated 12V output (via FB divider) with fast transient response to burst traffic loads. Use Value: Fixed 215kHz switching and internal compensation simplify layout; 6.49W capability supports dual-band radios with peak transmit power. |
| IP Phones | WiMAX Base Stations |
|
Use Scenario: Enterprise VoIP phone with LCD display, speakerphone, and headset jack, drawing variable load from 50mA (idle) to 450mA (call). IC Role / Device Role / Timing Role: Dual-rail power manager providing 3.3V (LDO) for MCU/audio codec and 5V–12V (buck) for display backlight and analog circuitry. Use Value: Sleep mode LED pulsing (250Hz, 25% duty) provides visual status with <100μA average current - extends battery backup runtime during AC failure. |
Use Scenario: Outdoor small-cell base station with PoE-powered RF transceiver, FPGA, and environmental monitoring sensors. IC Role / Device Role / Timing Role: Robust PD interface with 2kV CDE-rated integrated TVS diode protecting against Ethernet cable discharge events. Use Value: Withstands 2kV, 200m CAT-6 cable discharge per IEC 61000-4-5 - eliminates need for external TVS on data lines in harsh industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Powered Device applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4275AIMSE#TRPBF | IEEE 802.3at (PoE+) compliant, supports Class 4 (up to 30W); no integrated DC-DC converter - requires external buck controller. | Targeted at higher-power applications (e.g., PTZ cameras, thin clients); lacks integrated power stage and LDO. | Select when >25.5W PoE budget is required and board space allows discrete power stage design. |
| TPS23753APWR | IEEE 802.3af compliant with integrated flyback controller; supports isolated 5V/12V outputs; no MPS or sleep mode support. | Used where galvanic isolation is mandatory (e.g., medical devices); lacks ultra-low-power state for extended standby. | Choose for isolated output requirements where MPS and ULP modes are not needed. |
Compared with LT4275AIMSE#TRPBF and TPS23753APWR, the MAX5988BETP+ uniquely combines Class 2 PoE compliance, integrated buck converter, LDO, MPS, and ultra-low-power sleep mode in a single 4mm × 4mm package - reducing solution size by >30% versus discrete alternatives while enabling always-on network presence.
Availability
MAX5988BETP+ is available at Aetrix Electronics and suitable for IP security cameras, wireless access nodes, IP phones, and WiMAX base stations requiring stable component supply, long-term lifecycle support, and guaranteed PoE compliance.
Supply support for MAX5988BETP+ 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, communications, and computing applications.
The MAX5988BETP+ belongs to Maxim's Power-over-Ethernet PD controller product line, engineered specifically to reduce bill-of-materials and layout complexity in Class 1/Class 2 PoE-powered endpoints while meeting IEEE 802.3af timing, signature, and reliability requirements.
FAQ
What is the maximum input voltage supported by the MAX5988BETP+?
The MAX5988BETP+ supports a maximum input voltage of 60V on the VDD pin, with absolute maximum rating of +70V (internally clamped). This accommodates the full IEEE 802.3af PoE voltage range (37–57V at PSE) plus worst-case cable drop and transient margins. Operation above 60V violates specifications and risks permanent damage.
How does the MAX5988BETP+ implement Class 2 classification?
The MAX5988BETP+ implements Class 2 classification by sinking 18mA (typ) when the CLASS2 pin is tied to VDRV (5V). This current is generated using the same 24.9kΩ external resistor connected to RREF, eliminating need for additional current-setting components. The device guarantees this value across -40°C to +85°C and complies with IEEE 802.3af Class 2 tolerance (±10%).
Can the MAX5988BETP+ operate without an external inductor?
No. The MAX5988BETP+ requires an external power inductor connected between LX and the output filter capacitor to enable its integrated step-down DC-DC converter. The inductor is essential for energy storage and transfer in the buck topology; omitting it prevents regulation and may cause device failure due to uncontrolled current flow through the internal high-side pMOS.
What is the purpose of the AUX pin on the MAX5988BETP+?
The AUX pin on the MAX5988BETP+ enables back-bias operation: when connected to a buck output voltage >4.75V, it powers internal circuitry (including the VDRV regulator) directly from the output rail instead of VDD. This reduces conduction losses in the isolation pMOS and improves overall system efficiency by up to 3% under typical load conditions.
Does the MAX5988BETP+ support wall adapter power fallback?
Yes. The MAX5988BETP+ supports wall adapter detection via the WAD pin, which triggers at 8.8V (rising) and disables the PoE interface when auxiliary power is present. This allows seamless fallback to local power during PoE outages and is validated for use with standard 12V wall adapters in dual-source configurations per Maxim's Figure 3 and Figure 4 reference designs.
MAX5988BETP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Controller (PD), DC/DC
- Number of Channels:
- 1
- Power - Max:
- 6.49 W
- Internal Switch(s):
- Yes
- Auxiliary Sense:
- Yes
- Standards:
- 802.3af (PoE)
- Voltage - Supply:
- 8.8V ~ 60V
- Current - Supply:
- 3.3mA
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (4x4)
MAX5988BETP+ FAQ
1.How can I place an order for MAX5988BETP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5988BETP+ 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 MAX5988BETP+ reliable?
The price and inventory of MAX5988BETP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5988BETP+ is usually 5 days.
3.What payment methods are accepted for MAX5988BETP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5988BETP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5988BETP+?
MAX5988BETP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5988BETP+ 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 MAX5988BETP+?
For technical support, including MAX5988BETP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5988BETP+ requirements.
6.How does Aetrix verify that MAX5988BETP+ is sourced from the original manufacturer or authorized distributors?
All MAX5988BETP+ 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 MAX5988BETP+ meets industry standards.
7.What is the process for return or replacement of MAX5988BETP+?
All MAX5988BETP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5988BETP+, 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 MAX5988BETP+ part is unused and in its original packaging.
Return procedure for MAX5988BETP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX5988BETP+ Tags
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