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Analog Devices Inc./Maxim Integrated MAX5074AAUP+
- Part No.:
- MAX5074AAUP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX5074AAUP+.pdf
- Description:
- IC PWR FOR IEEE 802.3AF 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,771
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Product details
Overview
MAX5074AAUP+ from Maxim Integrated is an isolated PWM power IC with integrated 0.4Ω high-voltage MOSFETs, designed for IEEE 802.3af PoE-powered devices and telecom power supplies. It supports 11V–76V input, delivers up to 15W output in forward/flyback topologies, operates up to 500kHz, and features look-ahead synchronous rectifier drive for >90% efficiency.
For engineers reviewing the MAX5074AAUP+ datasheet, MAX5074AAUP+ pinout, MAX5074AAUP+ application, or MAX5074AAUP+ equivalent, key selection considerations include clamped two-switch topology compatibility, 20-pin TSSOP-EP thermal performance, hiccup-mode short-circuit protection, and bias regulator auto-turnoff for high-voltage safety compliance.
Technical Context
The MAX5074AAUP+ implements feed-forward voltage-mode control to reject input transients rapidly and uses a voltage-clamped two-transistor forward/flyback architecture that recovers magnetizing and leakage energy without requiring a reset winding. Its integrated MOSFETs are rated for high-voltage operation (76V max input) and low RDS(on) (0.4Ω), enabling compact magnetics at up to 500kHz switching.
It includes a dedicated look-ahead signal output to drive secondary-side synchronous rectifiers, programmable brownout UVLO, and internal overtemperature shutdown with indefinite short-circuit protection using fault-integration timing - all operating across –40°C to +125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 11V to 76V DC - supports standard 48V telecom bus and PoE PD input with margin for transients. |
| Output Power | Up to 15W - sufficient for IEEE 802.3af Class 3/4 powered devices including IP phones and WLAN APs. |
| Switching Frequency | Up to 500kHz - enables smaller transformers and output capacitors in space-constrained telecom modules. |
| MOSFET RDS(on) | 0.4Ω (integrated) - reduces conduction loss and improves efficiency in high-current primary-side switching. |
| Operating Temperature | –40°C to +125°C - qualified for industrial and telecom environments with extended thermal margins. |
| Package Thermal Performance | TSSOP-EP, 20-pin, 42.9mm² - exposed pad enhances PCB heat dissipation for 1.74W power handling. |
Pinout & Package
MAX5074AAUP+ is housed in a thermally enhanced 20-pin TSSOP package with exposed pad (TSSOP-EP), optimized for high-power density and efficient heat transfer to the PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main high-voltage input supply | Accepts 11V–76V DC; connects directly to primary-side bulk capacitor and integrated MOSFET drains. |
| GND | Power and signal reference ground | Common return for control logic, gate drivers, and thermal pad; must be tied to exposed pad for thermal integrity. |
| VOUT | Regulated output sense node | Feedback input for voltage-mode control loop; connects to optocoupler or secondary-side error amplifier. |
| LA | Look-ahead signal output | Drives external synchronous rectifier gate driver with precise timing to minimize body-diode conduction loss. |
| UVLO | Programmable undervoltage lockout | Resistor-divider sets turn-on threshold; provides brownout protection during input sag or startup. |
Key Features
| Feature | Design Value |
|---|---|
| Clamped two-switch topology | Eliminates need for reset winding and enables full recovery of leakage/magnetizing energy - improves reliability and efficiency vs. conventional forward converters. |
| Bias voltage regulator with HV auto-turnoff | Provides internal VCC for controller while automatically disabling high-voltage supply when not needed - reduces no-load power and improves safety. |
| Hiccup-mode short-circuit protection | Shuts down on fault, waits fixed interval, then retries - prevents thermal runaway during sustained overload or output short. |
| Feed-forward voltage-mode control | Compensates for input line variations within one switching cycle - critical for stable regulation under dynamic 48V bus conditions. |
Applications
| IEEE 802.3af PD Power Supply | Telecom Line-Card Power |
|---|---|
Use Scenario: Powered device (PD) in PoE-enabled IP phone or VoIP gateway receiving power over Ethernet cable. IC Role / Device Role / Timing Role: Primary-side isolated PWM controller managing flyback conversion from 48V PSE input to isolated 3.3V/5V/12V rails. Use Value: Integrated MOSFETs and look-ahead drive enable >90% efficiency and compact BOM - meeting Class 3 power budget (12.95W) with margin. | Use Scenario: Distributed 48V-to-12V/5V conversion on ADSL line-card backplane with strict thermal limits. IC Role / Device Role / Timing Role: High-efficiency forward converter controller driving transformer primary with clamped two-switch topology. Use Value: No reset winding required and 500kHz operation reduce transformer size and board area - critical for dense line-card layouts. |
| Isolated IP Phone Power Supply | WLAN Access Point Power Module |
Use Scenario: Standalone isolated DC-DC module powering voice processing, Ethernet PHY, and MCU in desktop IP phone. IC Role / Device Role / Timing Role: Primary-side controller with integrated MOSFETs and synchronous rectifier timing signal for secondary-side FET drive. Use Value: Bias regulator auto-turnoff minimizes standby power; hiccup protection ensures safe operation during handset disconnect events. | Use Scenario: Compact 48V-input power module supplying 5V/3.3V to RF front-end and baseband processor in enterprise WLAN AP. IC Role / Device Role / Timing Role: Isolated forward converter IC delivering regulated outputs with fast transient response via feed-forward control. Use Value: Wide input range (11V–76V) accommodates 48V bus variation and surge; 20-pin TSSOP-EP enables high power density in limited board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2897A | Requires external high-voltage MOSFETs; no integrated power switches; supports active clamp forward only. | Lacks integrated MOSFETs and look-ahead signal - needs additional gate drivers and layout complexity for synchronous rectification. | Choose UCC2897A only if higher voltage rating (>76V) or active-clamp forward topology is required; adds BOM cost and design effort. |
| NCP1075 | Fixed-frequency current-mode controller; no integrated MOSFETs; max input 265VAC/700VDC but no HV bias regulation or LA signal. | Designed for universal AC-DC, not optimized for 48V DC telecom bus; lacks hiccup protection and feed-forward control. | Select NCP1075 for AC-input offline SMPS; unsuitable for PoE PD or telecom DC-DC where input transient rejection and integrated features are critical. |
Compared with UCC2897A and NCP1075, the MAX5074AAUP+ uniquely integrates 0.4Ω MOSFETs, look-ahead timing, and HV bias auto-turnoff - reducing component count and improving efficiency in 48V-isolated DC-DC designs targeting IEEE 802.3af compliance.
Availability
MAX5074AAUP+ is available at Aetrix Electronics and suitable for IEEE 802.3af PD power supplies, telecom line-card power modules, and isolated IP phone power systems requiring stable component supply and long-term lifecycle support.
Supply support for MAX5074AAUP+ 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 is a semiconductor company specializing in analog and mixed-signal ICs for power, interface, sensing, and communication applications.
The MAX5074A product line targets isolated DC-DC conversion in PoE-powered devices and telecom infrastructure, emphasizing integration, efficiency, and robust protection for high-reliability 48V bus environments.
FAQ
What is the maximum output power supported by the MAX5074AAUP+?
The MAX5074AAUP+ supports up to 15W of output power in properly designed forward or flyback configurations. This capability meets and exceeds the 12.95W requirement for IEEE 802.3af Class 3 powered devices. Actual delivered power depends on transformer design, layout, cooling, and input voltage - the MAX5074AAUP+'s 0.4Ω integrated MOSFETs and 500kHz switching help sustain this level efficiently.
Does the MAX5074AAUP+ require an external reset winding in forward converter designs?
No, the MAX5074AAUP+ does not require an external reset winding. Its voltage-clamped, two-transistor forward topology fully recovers magnetizing and leakage inductive energy internally. This eliminates the need for a separate reset winding, simplifying transformer design and reducing component count - a key advantage over conventional forward controllers like the UC384x family.
What is the function of the LA (look-ahead) pin on the MAX5074AAUP+?
The LA pin on the MAX5074AAUP+ provides a precisely timed digital signal to drive external synchronous rectifier gate drivers on the secondary side. This signal anticipates the primary switch turn-off to enable zero-voltage switching of the SR FET, minimizing body-diode conduction loss and boosting overall efficiency beyond 90% - a feature not present in basic PWM controllers such as the TL494 or UC3845.
Can the MAX5074AAUP+ operate across the full industrial temperature range?
Yes, the MAX5074AAUP+ is specified to operate from –40°C to +125°C ambient temperature. This wide range is validated for continuous operation under load and supports deployment in uncontrolled telecom cabinets, outdoor WLAN access points, and industrial PoE switches where thermal management is challenging - unlike commercial-grade alternatives rated only to +85°C.
How does the MAX5074AAUP+ handle short-circuit conditions?
The MAX5074AAUP+ employs hiccup-mode short-circuit protection with programmable fault integration. Upon detecting overcurrent, it shuts down, waits a fixed interval, then attempts restart. If the fault persists, it repeats the cycle - preventing thermal damage during indefinite shorts. This behavior differs from latch-off or constant-current limit schemes used in many generic controllers, making the MAX5074AAUP+ especially robust in field-deployed telecom equipment.
MAX5074AAUP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- -
- Voltage - Input:
- -
- Number of Outputs:
- -
- Voltage - Output:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
MAX5074AAUP+ FAQ
1.How can I place an order for MAX5074AAUP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5074AAUP+ 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 MAX5074AAUP+ reliable?
The price and inventory of MAX5074AAUP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5074AAUP+ is usually 5 days.
3.What payment methods are accepted for MAX5074AAUP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5074AAUP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5074AAUP+?
MAX5074AAUP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5074AAUP+ 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 MAX5074AAUP+?
For technical support, including MAX5074AAUP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5074AAUP+ requirements.
6.How does Aetrix verify that MAX5074AAUP+ is sourced from the original manufacturer or authorized distributors?
All MAX5074AAUP+ 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 MAX5074AAUP+ meets industry standards.
7.What is the process for return or replacement of MAX5074AAUP+?
All MAX5074AAUP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5074AAUP+, 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 MAX5074AAUP+ part is unused and in its original packaging.
Return procedure for MAX5074AAUP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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