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Analog Devices Inc./Maxim Integrated MAX17505SATP+
- Part No.:
- MAX17505SATP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX17505SATP+.pdf
- Description:
- IC REG BUCK ADJ 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:261
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Product details
Overview
MAX17505SATP+ 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 at 0.9V–90%VIN output. It features internal compensation, ±1.1% FB regulation accuracy over –40°C to +125°C, and peak efficiency >90%. Used in industrial power supplies and high-voltage single-board systems.
For engineers reviewing the MAX17505SATP+ datasheet, MAX17505SATP+ pinout, MAX17505SATP+ application, or MAX17505SATP+ equivalent, key selection considerations include its 20-pin TQFN package, MODE-selectable PWM/PFM/DCM operation, programmable soft-start, open-drain RESET, and resistor-programmable EN/UVLO threshold.
Technical Context
The MAX17505SATP+ employs peak-current-mode control with a MODE pin that selects between PWM (constant frequency), PFM (pulse-skipping, high light-load efficiency), and 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 100mA current limit, supports external synchronization (1.1× to 1.4× fSW), and includes hiccup-mode overcurrent protection, thermal shutdown at 165°C, and FB-based RESET with 92–97.2% trip/deassert thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports wide industrial and telecom input rails without pre-regulation. |
| Output Current | Up to 1.7A continuous - rated over full –40°C to +125°C ambient temperature. |
| Feedback Accuracy | ±1.1% over –40°C to +125°C - ensures stable output regulation under thermal stress. |
| Switching Frequency | 100kHz to 2.2MHz (RRT-programmable) - enables optimization of size, efficiency, and EMI. |
| Peak Efficiency | >90% - achieved via synchronous rectification and low RDS-ON (165mΩ HS / 80mΩ LS). |
| Soft-Start Current | 5µA typical - allows precise RC timing for controlled inrush current limiting. |
| RESET Threshold | 92% VFB-REG trip / 95% deassert - provides reliable power-good signaling with hysteresis. |
Pinout & Package
Package: 20-pin, 4mm × 4mm TQFN with exposed pad (RoHS-compliant, lead(Pb)-free). Thermal resistance θJA = 33°C/W (four-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3, VIN | Power input | High-current input node; must be decoupled with 2.2µF ceramic capacitor close to pins. |
| 4, EN/UVLO | Enable/UVLO input | Resistor-divider programmable turn-on threshold (1.215V typ); pull to VIN for always-on. |
| 5, RESET | Open-drain power-good | Asserts low when FB <92% regulation; deasserts 1024 cycles after FB >95%. |
| 6, SYNC | External clock input | Accepts 1.1×–1.4× fSW external clock for EMI reduction or multi-phase sync. |
| 7, SS | Soft-start timing | 5µA constant current charges external capacitor to control ramp rate and inrush. |
| 9, FB | Voltage feedback | 0.9V regulation reference; connects to resistor divider on output for adjustable VOUT. |
| 10, RT | Frequency set | Resistor-to-SGND sets fSW from 100kHz to 2.2MHz; open = 500kHz default. |
| 11, MODE | Control mode select | GND = PWM, open = PFM, VCC = DCM - configures light-load behavior and efficiency profile. |
| 12, VCC | Integrated LDO output | 5V ±5%, 100mA max; powers internal circuitry and requires 2.2µF SGND bypass. |
| 13, SGND | Analog ground | Reference for FB, SS, CF, MODE, SYNC; connect to PGND at VCC bypass capacitor. |
| 14–16, PGND | Power ground | High-current return path for LX and VIN; tie externally to PCB power ground plane. |
| 17–19, LX | Switch node | Connects to inductor switch-side; handles high di/dt; requires tight layout and thermal vias. |
| 20, BST | Bootstrap supply | 0.1µF ceramic capacitor to LX generates gate drive voltage for high-side MOSFET. |
| EP, Exposed Pad | Thermal & electrical ground | Must be soldered to SGND and connected via multiple thermal vias to inner ground planes. |
Key Features
| Feature | Design Value |
|---|---|
| All-ceramic capacitor solution | Enables ultra-compact layout with as few as eight external components, eliminating electrolytics. |
| Internal compensation | Eliminates external compensation network across entire 0.9V–90%VIN output range. |
| Three selectable control modes | PWM (fixed-freq), PFM (light-load skipping), DCM (light-load no-skip) - optimized efficiency vs. noise trade-off. |
| Programmable EN/UVLO threshold | Resistor-divider sets precise turn-on voltage (1.215V ref), enabling sequenced power-up. |
| Hiccup-mode overcurrent protection | Autoretry startup after fault clears; runaway current limit at 3.4A prevents catastrophic failure. |
| Prebiased soft-start support | Allows safe startup into precharged output without reverse current flow. |
Applications
| Industrial Power Supplies | Distributed Supply Regulation |
|---|---|
Use Scenario: Providing isolated 5V/3.3V rails from 24V/48V factory bus in PLC I/O modules. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering point-of-load power with hiccup protection. Use Value: Wide 4.5V–60V input accommodates brownout and surge conditions; 1.7A output supports multiple downstream LDOs or logic rails. | Use Scenario: Local regulation on high-voltage backplanes in telecom line cards or base station radios. IC Role / Device Role / Timing Role: Synchronous step-down converter generating intermediate 5V or 3.3V from 48V distribution rail. Use Value: Peak efficiency >90% reduces thermal load in dense boards; SYNC pin enables multi-rail phase alignment. |
| Base Station Power Supplies | Wall Transformer Regulation |
Use Scenario: Generating bias voltages for RF power amplifiers and transceivers in 5G macro cells. IC Role / Device Role / Timing Role: High-reliability DC-DC converter with thermal shutdown (165°C) and extended junction temp rating (+150°C). Use Value: Robust operation from –40°C to +125°C ambient ensures uptime in outdoor enclosures; RESET pin enables system-level power sequencing. | Use Scenario: Replacing linear regulators in universal-input wall adapters powering IoT gateways or smart home hubs. IC Role / Device Role / Timing Role: Efficient primary-stage buck converting rectified AC (e.g., 36V DC) to 5V USB-PD compatible rail. Use Value: PFM mode achieves >85% efficiency at 10mA load, extending standby battery life; compact 4mm × 4mm TQFN fits space-constrained adapters. |
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, no integrated compensation, requires external loop components. | Automotive AEC-Q100 qualified; lacks PFM/DCM mode flexibility and RESET output. | Select for automotive environments requiring qualification; avoid if internal compensation or power-good signaling is required. |
| TPS54560BQDDARQ1 | 3.5V–60V input, 5A output, current-mode control, no MODE pin for PFM/DCM selection. | Higher current capability; fixed PWM-only operation limits light-load efficiency vs. MAX17505SATP+. | Choose when >1.7A output is needed; accept higher quiescent current (146µA vs. 2.8µA shutdown) and no light-load mode switching. |
Compared with LM5164QPWPRQ1 and TPS54560BQDDARQ1, the MAX17505SATP+ delivers superior light-load efficiency via MODE-selectable PFM/DCM, built-in RESET signaling, and internal compensation-reducing BOM count and design validation effort for industrial and telecom point-of-load applications.
Availability
MAX17505SATP+ 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 RoHS-compliant packaging.
Supply support for MAX17505SATP+ 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 industrial, communications, and computing applications.
The MAX17505SATP+ belongs to Maxim's high-voltage synchronous buck converter product line, engineered for robust, efficient, and compact DC-DC conversion in harsh industrial and telecom environments where wide input range and thermal resilience are critical.
FAQ
What is the maximum output current capability of the MAX17505SATP+?
The MAX17505SATP+ delivers up to 1.7A continuous output current over the full industrial temperature range (–40°C to +125°C ambient). This rating accounts for thermal derating on standard multilayer PCBs and assumes proper layout with thermal vias to the exposed pad. Peak current-limit threshold is 2.8A, supporting transient loads without shutdown.
How does the MODE pin affect efficiency and noise performance in the MAX17505SATP+?
The MODE pin on the MAX17505SATP+ selects between PWM (MODE = GND), PFM (MODE = open), and DCM (MODE = VCC). PWM offers constant-frequency operation ideal for EMI-sensitive systems. PFM skips pulses at light loads for highest efficiency but increases output ripple. DCM maintains constant frequency while disabling negative inductor current, balancing ripple and efficiency - making MAX17505SATP+ adaptable across load profiles.
Can the MAX17505SATP+ operate with a prebiased output during startup?
Yes, the MAX17505SATP+ supports prebiased soft-start. When enabled via appropriate SS capacitor and timing, it prevents reverse current flow into a precharged output capacitor - critical for hot-swap and redundant power systems. This behavior is confirmed in Figure 16–17 of the datasheet and applies directly to the MAX17505SATP+ variant.
What is the purpose of the CF pin on the MAX17505SATP+ and when should it be used?
The CF pin on the MAX17505SATP+ is used for loop compensation at switching frequencies below 500kHz. A capacitor is connected from CF to FB to stabilize the control loop; CF is left open for fSW ≥ 500kHz. This feature enables internal compensation tuning without external op-amps or networks - simplifying design while maintaining stability across the full output voltage range.
Does the MAX17505SATP+ include thermal protection, and what is its trip threshold?
Yes, the MAX17505SATP+ includes thermal shutdown protection with a trip threshold of +165°C (rising temperature) and 10°C hysteresis. This protects against sustained overload or poor heatsinking. The device resumes normal operation once junction temperature falls below +155°C. This thermal specification is guaranteed across the full –40°C to +125°C ambient range and applies specifically to the MAX17505SATP+ package configuration.
MAX17505SATP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Himalaya
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tube
- 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:
- -
- 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)
MAX17505SATP+ FAQ
1.How can I place an order for MAX17505SATP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17505SATP+ 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 MAX17505SATP+ reliable?
The price and inventory of MAX17505SATP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17505SATP+ is usually 5 days.
3.What payment methods are accepted for MAX17505SATP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17505SATP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17505SATP+?
MAX17505SATP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17505SATP+ 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 MAX17505SATP+?
For technical support, including MAX17505SATP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17505SATP+ requirements.
6.How does Aetrix verify that MAX17505SATP+ is sourced from the original manufacturer or authorized distributors?
All MAX17505SATP+ 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 MAX17505SATP+ meets industry standards.
7.What is the process for return or replacement of MAX17505SATP+?
All MAX17505SATP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17505SATP+, 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 MAX17505SATP+ part is unused and in its original packaging.
Return procedure for MAX17505SATP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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