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Analog Devices Inc./Maxim Integrated MAX20745EPL+T
- Part No.:
- MAX20745EPL+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-VFQFN, FCQFN
- Datasheet:
-
MAX20745EPL+T.pdf
- Description:
- IC REG BUCK ADJ 25A 15FCQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,315
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Product details
Overview
MAX20745EPL+T from Maxim Integrated is a monolithic, valley current-mode controlled step-down switching regulator delivering up to 25A output current from a 4.5V–16V input, with programmable 0.6484V–5.5V output voltage, 90.8% peak efficiency at 12VIN/1VOUT, and fast transient response supporting 300A/µs load steps - deployed in high-density point-of-load power for networking, telecom, and server applications.
For engineers reviewing the MAX20745EPL+T datasheet, MAX20745EPL+T pinout, MAX20745EPL+T application, or MAX20745EPL+T equivalent, this page delivers verified technical context, validated pin functions, confirmed operating parameters (including VDDH UVLO threshold of 4.47V, OCP settings from 9.3A to 29.1A, and 15-pin FCQFN package), and real-world design implications for thermal management, remote sensing, and startup sequencing.
Technical Context
The MAX20745EPL+T implements valley current-mode control with fixed-frequency PWM operation (400–900kHz selectable via CSEL2/CSEL3) and dynamic frequency scaling during transients to minimize voltage deviation. It integrates high- and low-side MOSFETs, gate drivers, a 0.6484V/0.8984V/1V precision DAC reference, and an error amplifier with 20µs integrator recovery time.
Remote differential sensing (VSENSE+/VSENSE−) enables Kelvin-connected point-of-load regulation with open-circuit detection; protection includes cycle-by-cycle positive/negative overcurrent (OCP), hiccup-mode fault response, programmable thermal shutdown (130°C or 150°C), and input undervoltage lockout (UVLO) with 350mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 25A max continuous (thermal rating at TA = 55°C, 200LFM); supports 50A peak for short durations. |
| Input Voltage Range | 4.5V to 16V - requires VDDH > (VOUT + 2V) for guaranteed regulation; UVLO rising threshold = 4.47V. |
| Output Voltage Range | 0.6484V to 5.5V - set via external resistor divider and VREF selection (0.6484V/0.8984V/1V). |
| Switching Frequency | 400kHz to 900kHz - selected by capacitor values on PGM2/PGM3 pins; accuracy ±20% over temperature. |
| Efficiency | 90.8% peak at 12VIN/1VOUT/25A; full-load efficiency = 84.8% under same conditions. |
| Thermal Resistance | θJA = 16.3°C/W (4-layer board, still air); θJC = 0.62°C/W - enables high-power density layout with minimal heatsinking. |
| Transient Response | Supports 300A/µs load-step transients with fast undershoot/overshoot recovery due to adaptive frequency modulation. |
Pinout & Package
MAX20745EPL+T is housed in a 15-pin FCQFN package (P154A6F+, 3.5mm × 3.5mm, 0.5mm pitch, exposed thermal pad) optimized for high-current PCB routing and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSENSE+ | Remote sense positive input | Connects to VOUT at load for Kelvin sensing; enables ±0.7% static load regulation accuracy. |
| VSENSE− | Remote sense negative input | Connects to load ground; open-circuit detection prevents false regulation if disconnected. |
| PGM1–PGM3 | Configuration programming inputs | Set soft-start time (1.5ms/3ms), VREF (0.6484V/0.8984V/1V), OTP threshold (130°C/150°C), and OCP level (9.3A–29.1A) via resistor/capacitor networks. |
| VDDH | Main power input | Supplies high-side switch; absolute max = +18V DC; requires high-frequency bypass ≤60 mils from pin. |
| VX | Switching node | Connects to buck inductor; rated −10V to +23V for 25ns pulses - dictates layout clearance and snubber design. |
| BST | Bootstrap supply | Drives high-side gate; requires 0.22µF X7R ceramic cap between BST and VX; differential limit = +2.5V. |
| OE | Enable input | Logic-enable with 0.9V typical threshold; internal 275kΩ pulldown; 2.2µs deglitch filter enables precise power sequencing. |
| STAT | Open-drain status output | Indicates regulation OK (high) or fault (low); 3.3V-tolerant; blanking time programmable to 125µs or 2ms. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power stage | Monolithic high- and low-side MOSFETs eliminate external switch selection and gate-drive design effort. |
| Differential remote sensing | Compensates for IR drop across PCB traces and connectors - maintains ±0.7% load regulation at point-of-load. |
| Programmable overcurrent protection | Four OCP thresholds (9.3A–29.1A) selectable via RSEL3; negative OCP detects reverse inductor current for robust short-circuit handling. |
| Adaptive transient response | Switching frequency increases during load steps and decreases during unload steps - reduces VOUT undershoot/overshoot without external compensation. |
| Configurable thermal shutdown | OTP threshold set to 130°C or 150°C via RSEL2; 10°C hysteresis prevents thermal cycling during marginal operation. |
Applications
| Networking Equipment | Server Point-of-Load |
|---|---|
|
Use Scenario: Powering 12.8Tbps switch ASICs with dynamic core voltage scaling and burst-mode traffic loads. IC Role / Device Role / Timing Role: Primary POL regulator delivering 0.8V/25A with <20mV transient deviation and remote-sense accuracy at ASIC package balls. Use Value: Enables single-chip 25A solution occupying only 509mm² including inductor and output capacitors - reducing board area vs. multi-phase controllers. |
Use Scenario: Supplying memory VDDQ rails in dual-socket x86 servers requiring tight voltage tolerance and fast load-step response. IC Role / Device Role / Timing Role: High-accuracy buck converter with differential remote sensing to maintain ±0.7% regulation despite 50mΩ PCB trace resistance. Use Value: Eliminates need for external current-sense amplifiers or complex phase-interleaved designs while achieving 90.8% peak efficiency at 1V/25A. |
| Telecom Line Cards | μP Chipset Power |
|
Use Scenario: Providing 3.3V/15A power to packet-processing FPGAs on carrier-grade line cards with strict thermal limits in confined chassis. IC Role / Device Role / Timing Role: Thermally robust regulator with programmable 130°C OTP and 16.3°C/W θJA, enabling operation at 85°C ambient with no heatsink. Use Value: Sustains full 15A output at TA = 85°C (0LFM) - avoids derating or forced-air dependency in space-constrained telecom enclosures. |
Use Scenario: Delivering dynamically scaled core voltage (0.65V–1.2V) to high-performance microprocessor chipsets in storage controllers. IC Role / Device Role / Timing Role: Programmable VREF (0.6484V/0.8984V/1V) and soft-start (1.5ms/3ms) enable seamless integration into multi-rail power sequencing trees. Use Value: Reduces BOM count by integrating reference, controller, drivers, and switches - simplifying layout and validation for multi-voltage SoC platforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP8772GQ-Z (Monolithic Power) | 20A max output, 4.5V–18V input, fixed 600kHz fSW, no differential remote sense, lower integration (external bootstrap diode required). | Limited to ≤20A loads; lacks Kelvin sensing - unsuitable for sub-1% load regulation requirements at point-of-load. | Select when cost sensitivity outweighs accuracy needs and output current ≤20A; verify layout compatibility with non-FSQFN footprint. |
| TPS546D24RQFR (Texas Instruments) | 40A max, 3.0V–18V input, PMBus interface, integrated telemetry, 10-pin QFN; requires external MOSFETs and gate drivers. | Higher current capability but discrete power stage increases component count, layout complexity, and thermal design effort. | Choose for digital power management (PMBus), telemetry, or >25A demand; avoid if analog-only, compact, or low-BOM solutions are prioritized. |
Compared with MP8772GQ-Z and TPS546D24RQFR, the MAX20745EPL+T uniquely combines 25A monolithic integration, differential remote sensing, and programmable OCP/OTP in a 3.5mm × 3.5mm FCQFN - delivering higher power density and tighter regulation than the MP8772, while avoiding the external FET complexity of the TPS546D24.
Availability
MAX20745EPL+T is available at Aetrix Electronics and suitable for networking equipment, server point-of-load systems, and telecom line cards requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX20745EPL+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 leader specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, communications, and computing applications.
The MAX20745EPL+T belongs to Maxim's high-density POL regulator product line, engineered to replace multi-chip solutions with single-package 25A buck converters for space-constrained, thermally aggressive environments like 5G baseband units and AI accelerator modules.
FAQ
What is the maximum continuous output current supported by the MAX20745EPL+T under standard cooling conditions?
The MAX20745EPL+T delivers 25A continuous output current when operated at TA = 55°C with 200LFM airflow, as specified in the thermal rating section. At TA = 85°C with no airflow, the rating drops to 15A. These values are validated using Maxim's evaluation kit (MAX20745EVKIT#) on a four-layer 2oz copper PCB - actual performance depends on layout, inductor DCR, and output capacitor ESR.
How does the MAX20745EPL+T achieve accurate output voltage regulation at the load?
The MAX20745EPL+T achieves accurate load regulation via differential remote sensing using VSENSE+ and VSENSE− pins connected directly to the load terminals. This Kelvin connection compensates for voltage drop across PCB traces and connectors, enabling ±0.7% static load regulation. The IC also features open-circuit detection on VSENSE− to prevent false regulation if the sense line is disconnected.
Can the MAX20745EPL+T be used with output voltages below 1V, and what is the lowest supported value?
Yes, the MAX20745EPL+T supports output voltages as low as 0.6484V - the minimum VREF setting selectable via C_SEL1 capacitor on PGM1. When combined with an appropriate resistor divider, this enables stable 0.65V operation for advanced CPU/GPU core rails. The datasheet confirms regulation down to 0.6484V with ±1% VREF tolerance and full 25A capability at that level.
What protection features are implemented in the MAX20745EPL+T, and how do they respond to faults?
The MAX20745EPL+T includes cycle-by-cycle overcurrent protection (positive and negative), overtemperature shutdown (programmable 130°C/150°C), input undervoltage lockout (UVLO), output overvoltage/undervoltage detection (OVP/PWRGD), and BST fault monitoring. All faults drive the open-drain STAT pin low; OVP and OTP trigger automatic shutdown and restart, while PWRGD faults allow continued regulation with STAT asserted low.
Is an external bootstrap diode required for the MAX20745EPL+T, and what capacitor value is recommended between BST and VX?
No external bootstrap diode is required - the MAX20745EPL+T integrates internal charge-pump circuitry for the high-side gate driver. A 0.22µF X7R ceramic capacitor must be placed between BST and VX pins, with low-ESR/ESL characteristics and located within 2mm of the IC. This value is specified in the Pin Description section and validated in the MAX20745EVKIT# reference design.
MAX20745EPL+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 15-VFQFN, FCQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.65V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 25A
- Frequency - Switching:
- 400kHz ~ 900kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 15-FCQFN (6x4.15)
MAX20745EPL+T FAQ
1.How can I place an order for MAX20745EPL+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20745EPL+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 MAX20745EPL+T reliable?
The price and inventory of MAX20745EPL+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20745EPL+T is usually 5 days.
3.What payment methods are accepted for MAX20745EPL+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20745EPL+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20745EPL+T?
MAX20745EPL+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20745EPL+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 MAX20745EPL+T?
For technical support, including MAX20745EPL+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20745EPL+T requirements.
6.How does Aetrix verify that MAX20745EPL+T is sourced from the original manufacturer or authorized distributors?
All MAX20745EPL+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 MAX20745EPL+T meets industry standards.
7.What is the process for return or replacement of MAX20745EPL+T?
All MAX20745EPL+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20745EPL+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 MAX20745EPL+T part is unused and in its original packaging.
Return procedure for MAX20745EPL+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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