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Analog Devices Inc./Maxim Integrated MAX5074AUP+T
- Part No.:
- MAX5074AUP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX5074AUP+T.pdf
- Description:
- IC REG IEEE 802.3AF 1OUT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,327
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Product details
Overview
MAX5074AUP+T from Maxim Integrated is an isolated PWM power IC with integrated 0.4Ω high-voltage MOSFETs in a clamped two-transistor forward/flyback topology, supporting 11V–76V input, up to 15W output, 500kHz switching, and operation from –40°C to +125°C in a 20-pin thermally enhanced TSSOP-EP package. It serves as the primary-side controller for IEEE 802.3af PD and telecom isolated power supplies.
For engineers reviewing the MAX5074AUP+T datasheet, MAX5074AUP+T pinout, MAX5074AUP+T application, or MAX5074AUP+T equivalent, key selection criteria include its integrated MOSFETs, feed-forward voltage-mode control, programmable fault integration, look-ahead signal for synchronous rectification, and bias regulator with automatic HV supply turn-off - all critical for robust 48V bus-powered isolated DC/DC designs.
Technical Context
The MAX5074AUP+T implements voltage-mode control with feed-forward compensation via RCFF-generated ramp, enabling single-cycle rejection of input transients. Its clamped two-switch topology fully recovers magnetizing and leakage inductive energy, eliminating the need for a reset winding while enhancing efficiency and reliability.
It integrates dual 0.4Ω MOSFETs (QH/QL), a 9.5V ±0.5V REGOUT LDO with 1.25V dropout at 30mA, UVLO with 1.25V threshold and 140mV hysteresis, thermal shutdown at +160°C, and cycle-by-cycle current limiting at 156mV on CS - all coordinated through a single oscillator programmable up to 500kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 11V to 76V - supports wide-range industrial/telecom 48V bus inputs including transient surges. |
| Output Power | Up to 15W - enables compact isolated converters for PoE PDs and telecom modules without external MOSFETs. |
| Switching Frequency | Up to 500kHz - allows smaller magnetics and capacitors, reducing board area and cost. |
| Integrated MOSFET RDS(ON) | 0.4Ω (typ) - minimizes conduction loss and simplifies layout by integrating both high- and low-side switches. |
| REGOUT LDO | 9.5V ±0.5V, 50mA - powers internal drivers and external circuitry; includes automatic HV supply turn-off when INBIAS becomes active. |
| Current-Limit Threshold | 156mV (typ) on CS pin - provides precise, noise-filtered cycle-by-cycle overcurrent protection referenced to PGND. |
| Operating Temperature | –40°C to +125°C - rated for harsh environments including telecom line cards and industrial power modules. |
Pinout & Package
MAX5074AUP+T is housed in a 20-pin thermally enhanced TSSOP package with exposed paddle (EP), optimized for high-power density and thermal dissipation in isolated power applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 REGOUT | LDO output | 9.5V regulated supply for gate drivers and bias; requires ≥2.2µF ceramic bypass to GND. |
| 2 RTCT | Oscillator timing | Resistor-to-REGOUT and capacitor-to-GND set switching frequency (up to 500kHz). |
| 3 FLTINT | Fault integration | Capacitor-based timer for hiccup-mode short-circuit protection; trips at 2.7V, restarts at 1.9V. |
| 4 RCFF | Feed-forward ramp generator | Resistor-to-HVIN and capacitor-to-GND generate input-voltage-dependent PWM ramp for fast transient rejection. |
| 5 RAMP | PWM comparator noninverting input | Direct connection to RCFF; sets loop gain and ensures stable voltage-mode control. |
| 6 OPTO | PWM comparator inverting input | Feedback node for optocoupler-based secondary regulation; clamped during soft-start. |
| 7 CSS | Soft-start reference | 33µA constant-current charge to 7.3V prevents output overshoot; discharges internally at shutdown. |
| 8 PPWM | Look-ahead pulse output | Leads internal MOSFET drive by ~110ns to enable precise timing of secondary synchronous rectifiers. |
| 9 GND | Signal ground | Must be connected to PGND; separates analog reference from power return path. |
| 10 CS | Current-sense input | 156mV threshold referenced to PGND; includes internal noise filter and supports external RC filtering. |
| 11 PGND | Power ground | Low-impedance return for MOSFET sources and transformer windings; connects to GND externally. |
| 12 SRC | Low-side MOSFET source | Connects to PGND via sense resistor for current-limit detection; part of integrated QL drain-source path. |
| 13 XFRMRL | Transformer low-side terminal | Completes flyback/forward transformer primary return path; ties directly to QL source and PGND. |
| 14 DRVIN | Gate-driver supply input | Connected to REGOUT; powers internal high- and low-side drivers with ≥0.1µF local bypass. |
| 15 XFRMRH | Transformer high-side terminal | Connects to DRNH and BST; forms primary side of isolation transformer with QH drain. |
| 16 DRNH | High-side MOSFET drain | Connects to HVIN rail; carries full input current during switching; requires heavy copper and local decoupling. |
| 17 BST | Bootstrap supply | Capacitor (≥0.1µF) between BST and XFRMRH enables high-side driver operation; traces must be short/wide. |
| 18 UVLO | Undervoltage lockout input | Resistive divider from HVIN sets turn-on threshold (1.25V typ); pulling to GND forces shutdown. |
| 19 HVIN | High-voltage input | Main power input (11–76V); supplies internal regulators and high-side driver bootstrap circuitry. |
| 20 INBIAS | Bias winding input | Accepts rectified tertiary winding voltage; enables REGOUT to switch from HVIN to lower-loss bias supply. |
Key Features
| Feature | Design Value |
|---|---|
| Clamped two-switch topology | Eliminates reset winding requirement and recovers leakage/magnetizing energy - improves efficiency >90% with sync rectification. |
| Integrated 0.4Ω MOSFETs | Reduces BOM count and PCB footprint; enables self-contained 15W isolated power stage without external switches. |
| Feed-forward voltage-mode control | RCFF-derived ramp provides inherent input-line transient immunity - no additional compensation needed for 48V bus variation. |
| Look-ahead PPWM signal | 110ns-advanced pulse enables precise timing of secondary synchronous rectifiers - reduces conduction loss and improves light-load efficiency. |
| Programmable fault integration | FLTINT capacitor sets hiccup-mode timeout (e.g., 1ms–10ms); prevents nuisance tripping during load transients while ensuring safe shutdown on hard faults. |
| Thermally enhanced TSSOP-EP | 20-pin package with exposed paddle achieves 46°C/W θJA - sustains 1.74W continuous dissipation at +70°C ambient. |
Applications
| IEEE 802.3af PD Power Supply | Isolated Telecom Power Module |
|---|---|
|
Use Scenario: Powered device (PD) in PoE systems receiving power over Ethernet cable with 37–57V input. IC Role / Device Role / Timing Role: Primary-side PWM controller managing isolated forward conversion, regulating 3.3V/5V outputs with optocoupler feedback. Use Value: Integrated MOSFETs and clamped topology eliminate external switches and reset components, reducing solution size and cost for space-constrained PD designs. |
Use Scenario: 48V input, 5V/3A isolated DC/DC module for telecom line cards or base station subsystems. IC Role / Device Role / Timing Role: Primary-side controller implementing voltage-mode forward topology with synchronous rectifier timing via PPWM. Use Value: 500kHz operation enables small magnetics; REGOUT LDO and INBIAS bias switching reduce on-chip dissipation - sustaining full load across –40°C to +125°C. |
| ADSL Line-Driver Power Supply | Distributed 48V Bus Power System |
|
Use Scenario: Isolated auxiliary supply for ADSL line-driver ICs requiring clean, regulated 12V or ±15V rails. IC Role / Device Role / Timing Role: Flyback controller providing galvanic isolation and tight regulation using optocoupler feedback and soft-start. Use Value: No-reset-winding design simplifies transformer construction; integrating fault protection eliminates need for external current-limit circuitry. |
Use Scenario: Point-of-load converter in distributed power architecture with centralized 48V intermediate bus. IC Role / Device Role / Timing Role: High-efficiency isolated DC/DC stage delivering 3.3V/5V to downstream digital logic or interface ICs. Use Value: Feed-forward control maintains regulation during rapid 48V bus transients; thermal shutdown and UVLO ensure reliable operation in unattended equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2891DR | Requires external high-voltage MOSFETs; no integrated power switches; 100V max HVIN rating. | Supports higher input voltages but increases component count and layout complexity for 48V systems. | Choose UCC2891DR only if >76V input or discrete MOSFET optimization is required; MAX5074AUP+T offers lower system-level BOM cost. |
| NCP1014ST | Fixed-frequency 70kHz flyback controller; no integrated MOSFETs; no look-ahead signal or fault integration. | Targeted at low-cost, low-power (<5W) AC/DC adapters - lacks features needed for robust 15W telecom/PoE designs. | Select NCP1014ST for cost-sensitive <5W applications; MAX5074AUP+T is superior for 11–76V, 15W isolated DC/DC with reliability-critical protection. |
Compared with UCC2891DR and NCP1014ST, the MAX5074AUP+T delivers higher integration (dual 0.4Ω MOSFETs), advanced protection (programmable hiccup, thermal shutdown), and system-level optimizations (look-ahead PPWM, feed-forward control) specifically for 48V bus-powered isolated power in telecom and PoE infrastructure.
Availability
MAX5074AUP+T is available at Aetrix Electronics and suitable for IEEE 802.3af PD power supplies, isolated telecom/datacom modules, and 48V distributed power systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX5074AUP+T 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The MAX5074AUP+T belongs to Maxim's isolated power controller product line, designed specifically for compact, efficient, and highly protected 48V-input isolated DC/DC converters used in PoE, telecom, and datacom infrastructure.
FAQ
What is the maximum output power achievable with the MAX5074AUP+T?
The MAX5074AUP+T supports up to 15W of output power in properly designed forward or flyback topologies. This rating assumes operation within the specified –40°C to +125°C junction temperature range, use of the integrated 0.4Ω MOSFETs, appropriate magnetics, and implementation of synchronous rectification to achieve >90% efficiency. Derating applies above +70°C ambient due to thermal limits of the 20-pin TSSOP-EP package.
Does the MAX5074AUP+T require an external reset winding in forward converter designs?
No, the MAX5074AUP+T does not require an external reset winding. Its clamped two-transistor forward topology fully recovers stored energy from both magnetizing and leakage inductance, eliminating the need for a separate reset path. This simplifies transformer design, reduces component count, and improves reliability compared to conventional forward controllers.
How does the MAX5074AUP+T implement feed-forward voltage-mode control?
The MAX5074AUP+T generates a feed-forward PWM ramp at the RCFF pin using a resistor to HVIN and capacitor to GND. This ramp is applied to the RAMP pin and serves as the noninverting input to the PWM comparator. Because the ramp slope scales with input voltage, the controller inherently compensates for line transients within one switching cycle - a key advantage over standard voltage-mode controllers that require complex loop compensation.
What is the function of the PPWM pin on the MAX5074AUP+T?
The PPWM pin on the MAX5074AUP+T provides a look-ahead pulse that leads the internal power MOSFET switching edge by approximately 110ns. This signal is intended to drive secondary-side synchronous rectifiers, enabling precise timing to minimize body-diode conduction loss and maximize efficiency - especially critical in high-current, low-voltage isolated outputs.
Can the MAX5074AUP+T operate from a 48V input without external bias winding?
Yes, the MAX5074AUP+T can operate from a 48V input using only HVIN and the internal REGOUT LDO. However, for optimal efficiency, the INBIAS pin should be connected to a rectified bias winding once switching begins - this causes the internal regulator to switch from HVIN-powered mode (9.5V output) to bias-winding-powered mode (10.5V output), reducing on-chip power dissipation and improving thermal performance.
MAX5074AUP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Controller, IEEE 802.3af PD (Powered Device)
- Voltage - Input:
- 11V ~ 76V
- Number of Outputs:
- 1
- Voltage - Output:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
MAX5074AUP+T FAQ
1.How can I place an order for MAX5074AUP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5074AUP+T 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 MAX5074AUP+T reliable?
The price and inventory of MAX5074AUP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5074AUP+T is usually 5 days.
3.What payment methods are accepted for MAX5074AUP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5074AUP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5074AUP+T?
MAX5074AUP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5074AUP+T 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 MAX5074AUP+T?
For technical support, including MAX5074AUP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5074AUP+T requirements.
6.How does Aetrix verify that MAX5074AUP+T is sourced from the original manufacturer or authorized distributors?
All MAX5074AUP+T 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 MAX5074AUP+T meets industry standards.
7.What is the process for return or replacement of MAX5074AUP+T?
All MAX5074AUP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5074AUP+T, 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 MAX5074AUP+T part is unused and in its original packaging.
Return procedure for MAX5074AUP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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