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Analog Devices Inc./Maxim Integrated MAX17505ATP+T
- Part No.:
- MAX17505ATP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX17505ATP+T.pdf
- Description:
- IC REG BUCK ADJ 1.7A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,493
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Product details
Overview
MAX17505ATP+T from Maxim Integrated is a high-efficiency, synchronous step-down DC-DC converter with dual integrated MOSFETs, operating from 4.5V to 60V input and delivering up to 1.7A output current at 0.9V–90%VIN. It features peak-current-mode control, internal compensation, ±1.1% FB regulation accuracy over –40°C to +125°C, and operates in PWM/DCM/PFM modes. It is used in industrial power supplies and high-voltage single-board systems.
For engineers reviewing the MAX17505ATP+T datasheet, MAX17505ATP+T pinout, MAX17505ATP+T application, or MAX17505ATP+T equivalent, key selection considerations include its 20-pin TQFN package, 135ns minimum on-time, programmable soft-start, open-drain RESET output, and resistor-programmable EN/UVLO threshold for reliable startup under varying input conditions.
Technical Context
The MAX17505ATP+T implements a peak-current-mode control architecture with MODE-selectable operation: PWM (constant frequency), PFM (pulse-skipping, high light-load efficiency), or DCM (no pulse-skipping but disables negative inductor current). Its internal compensation eliminates external loop components across the full output voltage range.
It integrates a 5V LDO (VCC) with 4.75V–5.25V output and 26.5–100mA current limit, dual nMOS power switches (RDS(on)H = 165–325mΩ, RDS(on)L = 80–150mΩ), and thermal shutdown at 165°C with 10°C hysteresis. The device supports external synchronization (1.1× to 1.4× fSW) and offers adjustable switching frequency from 100kHz to 2.2MHz via RT resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - enables direct regulation from 12V, 24V, 36V, and 48V industrial rails without pre-regulation. |
| Output Current | Up to 1.7A continuous - supports point-of-load conversion for FPGA, DSP, or microcontroller core supplies. |
| Feedback Accuracy | ±1.1% over –40°C to +125°C - ensures stable output voltage across extended industrial temperature range. |
| Switching Frequency | 100kHz to 2.2MHz (RT-programmable) - allows optimization of size (higher fSW → smaller inductor/capacitor) vs. efficiency. |
| Min On-Time | 135ns - supports high VIN-to-VOUT ratios (e.g., 48V→3.3V) at 500kHz without pulse skipping. |
| Efficiency Peak | >90% - achieved in PWM mode at mid-load; PFM/DCM extend high efficiency down to <10mA load. |
| Shutdown Current | 2.8µA (typ) - minimizes system standby power in battery-backed or energy-sensitive applications. |
Pinout & Package
MAX17505ATP+T is housed in a compact, RoHS-compliant 20-pin TQFN package (4mm × 4mm, exposed pad), optimized for thermal performance and high-density PCB layouts. The exposed pad must be soldered to SGND for proper thermal dissipation and electrical reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3, VIN | Power Input | High-voltage input rail connection; pins must be shorted and decoupled locally with ≥2.2µF ceramic capacitor to PGND. |
| 4, EN/UVLO | Enable / UVLO Input | Resistor-divider programmable turn-on threshold (1.19–1.24V rising); enables controlled power sequencing and brown-out protection. |
| 5, RESET | Open-Drain Power-Good | Asserts low when FB falls below 92% VFB_REG; deasserts after 1024 cycles once FB rises above 95% - provides clean system reset timing. |
| 6, SYNC | External Clock Input | Accepts 1.1×–1.4× fSW external clock (e.g., 700kHz sync for 500kHz design) to eliminate beat frequencies in multi-rail systems. |
| 7, SS | Soft-Start Control | Capacitor-to-SGND sets ramp time; reduces input inrush current and prevents output overshoot during startup. |
| 8, CF | Compensation Filter | Connected to FB only for fSW < 500kHz; eliminates need for external Type-II/III compensation network. |
| 9, FB | Voltage Feedback Input | Monitors output via resistor divider; regulates output with ±1.1% accuracy; threshold is 0.89–0.936V depending on MODE state. |
| 10, RT | Frequency Set | Resistor-to-SGND sets fSW (100kHz–2.2MHz); open-circuit defaults to ~500kHz - enables precise EMI tuning. |
| 11, MODE | Control Mode Select | GND = PWM (fixed fSW), open = PFM (light-load efficiency), VCC = DCM (mid-efficiency, no pulse skipping). |
| 12, VCC | Integrated LDO Output | 5V ±2.5% regulated supply for internal circuitry; requires 2.2µF ceramic bypass to SGND; powers gate drivers and logic. |
| 13, SGND | Analog Ground | Reference for FB, SS, CF, MODE, RT, SYNC, EN/UVLO; must tie to PGND at single point near VCC bypass cap. |
| 14–16, PGND | Power Ground | High-current return path for LX switching; connect externally to ground plane; separate from SGND except at VCC cap node. |
| 17–19, LX | Switch Node | Connects to inductor switch-side; carries high di/dt; requires tight layout and Kelvin connection to minimize ringing. |
| 20, BST | Bootstrap Supply | Connects 0.1µF ceramic capacitor to LX; generates gate drive voltage for high-side MOSFET. |
| EP | Exposed Pad | Thermal and electrical connection to SGND; requires ≥4 thermal vias to inner ground plane for θJA = 33°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode - reduces conduction loss, improves efficiency >90%, and simplifies BOM. |
| Internal compensation | Enables stable regulation across full 0.9V–90%VIN output range with zero external compensation components. |
| All-ceramic solution | Supports ultra-compact layout using only eight external components (including input/output caps, inductor, RT, SS, BST, EN divider). |
| Three-mode control (PWM/DCM/PFM) | Allows dynamic trade-off between EMI (PWM), light-load efficiency (PFM), and transient response (DCM) without changing hardware. |
| Programmable EN/UVLO threshold | Resistor-divider configuration enables precise input voltage turn-on (e.g., 15V min for 24V nominal rail) and system-level sequencing. |
| Prebiased soft-start | Supports safe startup into precharged output (e.g., hot-swap or backup rail) without reverse current or latch-up. |
Applications
| Industrial Power Supplies | Distributed Supply Regulation |
|---|---|
Use Scenario: Central 48V backplane powering multiple isolated 3.3V/5V/12V loads in PLC or I/O modules. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting 48V to 5V for downstream DC-DC stages or logic rails. Use Value: 60V max input withstands load-dump transients; 1.7A output supports multiple downstream converters; PFM mode extends efficiency at partial load. |
Use Scenario: Local regulation on high-voltage motor drive boards where 24V or 36V bus powers gate drivers and MCU cores. IC Role / Device Role / Timing Role: Point-of-load (POL) converter delivering tightly regulated 3.3V to FPGA or ARM processor core. Use Value: ±1.1% FB accuracy maintains core voltage stability under wide temperature swings; 135ns min on-time enables 36V→3.3V at 500kHz. |
| Base Station Power Supplies | Wall Transformer Regulation |
Use Scenario: Remote radio unit (RRU) requiring efficient 12V-to-5V conversion in outdoor enclosures (-40°C to +85°C ambient). IC Role / Device Role / Timing Role: Secondary buck stage stepping down intermediate 12V rail to 5V for RF front-end ICs and ADCs. Use Value: –40°C to +125°C junction rating ensures reliability in uncooled enclosures; hiccup-mode current limit protects against antenna fault shorts. |
Use Scenario: Universal-input AC/DC adapter (90–264VAC) with wide-output DC bus (e.g., 36V–57V) feeding downstream POLs. IC Role / Device Role / Timing Role: Final-stage buck regulator converting high-voltage DC bus to 5V USB-C or 3.3V IoT sensor rail. Use Value: 4.5V–60V input range accommodates wide DC bus tolerances; all-ceramic design meets stringent EMI limits for consumer certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5V–65V input, 1A output, 1.5MHz max fSW, no internal compensation (requires external Type-II network). | Automotive AEC-Q100 qualified; lacks PFM/DCM modes - fixed-frequency only. | Select for automotive-grade designs requiring qualification; avoid if needing light-load efficiency or simplified compensation. |
| TPS54360DGQR | 3.5V–60V input, 3.5A output, 100kHz–2.5MHz fSW, no MODE pin - only PWM operation. | Higher current capability; no light-load efficiency modes; requires external compensation. | Choose when >1.7A output is required and PFM/DCM are unnecessary; verify thermal margin at full load. |
Compared with LM5164QPWPRQ1 and TPS54360DGQR, the MAX17505ATP+T delivers optimal balance of industrial temperature range, integrated compensation, three-mode control, and compact 20-pin TQFN packaging - reducing design complexity and board area while maintaining high efficiency across load conditions.
Availability
MAX17505ATP+T is available at Aetrix Electronics and suitable for industrial power supplies, distributed supply regulation, and base station power supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across manufacturing lots.
Supply support for MAX17505ATP+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 MAX17505ATP+T belongs to Maxim's high-voltage synchronous buck converter product line, designed specifically for robust, compact, and efficient DC-DC conversion in harsh industrial environments with wide input ranges and extended temperature requirements.
FAQ
What is the maximum input voltage rating for the MAX17505ATP+T?
The MAX17505ATP+T has an absolute maximum input voltage (VIN to PGND) of +65V, with recommended continuous operation from 4.5V to 60V. This 60V upper limit ensures reliable performance in 48V industrial and telecom systems, including those subject to load-dump transients up to 60V. Exceeding 65V risks permanent damage per the Absolute Maximum Ratings table.
Does the MAX17505ATP+T require external compensation components?
No, the MAX17505ATP+T features fully integrated loop compensation. For switching frequencies ≥500kHz, the CF pin is left open; for lower frequencies, a single capacitor from CF to FB suffices. This eliminates external Type-II or Type-III networks, reducing component count and layout sensitivity while maintaining stability across the full 0.9V–90%VIN output range.
How does the MODE pin affect efficiency and EMI behavior in the MAX17505ATP+T?
The MODE pin selects among PWM (GND), PFM (open), and DCM (VCC). PWM ensures constant switching frequency - ideal for EMI filtering and noise-sensitive systems. PFM skips pulses at light loads, maximizing efficiency below ~10mA but causing variable frequency. DCM disables negative inductor current without skipping pulses, offering middle-ground efficiency and predictable spectral content - critical for meeting CISPR standards.
Can the MAX17505ATP+T safely start up into a precharged output capacitor?
Yes, the MAX17505ATP+T supports prebiased soft-start. When the output is already charged (e.g., from a backup rail), the IC ramps the internal reference rather than forcing current into the precharged node. This prevents reverse current flow through the low-side MOSFET and avoids potential damage or instability - confirmed in Figures 16–17 of the datasheet under "Soft-Start with 2.5V Prebias".
What thermal performance can be expected from the MAX17505ATP+T in a standard 4-layer PCB layout?
On a standard 4-layer board with the exposed pad soldered to an internal SGND plane and ≥4 thermal vias, the MAX17505ATP+T achieves θJA = 33°C/W and θJC = 2°C/W. At 1.7A load and 24V input, typical power dissipation is ~1.2W; this yields ~40°C junction rise above ambient - well within the +150°C max rating and enabling full-load operation at +85°C ambient without forced air.
MAX17505ATP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Himalaya
- Package/Case:
- 20-WFQFN Exposed Pad
- 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):
- 60V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 54V
- Current - Output:
- 1.7A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (4x4)
MAX17505ATP+T FAQ
1.How can I place an order for MAX17505ATP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17505ATP+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 MAX17505ATP+T reliable?
The price and inventory of MAX17505ATP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17505ATP+T is usually 5 days.
3.What payment methods are accepted for MAX17505ATP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17505ATP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17505ATP+T?
MAX17505ATP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17505ATP+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 MAX17505ATP+T?
For technical support, including MAX17505ATP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17505ATP+T requirements.
6.How does Aetrix verify that MAX17505ATP+T is sourced from the original manufacturer or authorized distributors?
All MAX17505ATP+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 MAX17505ATP+T meets industry standards.
7.What is the process for return or replacement of MAX17505ATP+T?
All MAX17505ATP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17505ATP+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 MAX17505ATP+T part is unused and in its original packaging.
Return procedure for MAX17505ATP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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