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Analog Devices Inc./Maxim Integrated MAX17503SATP+T
- Part No.:
- MAX17503SATP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX17503SATP+T.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,044
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Product details
Overview
MAX17503SATP+T from Maxim Integrated is a high-voltage, synchronous step-down DC-DC converter with dual integrated MOSFETs, operating from 4.5V to 60V input and delivering up to 2.5A at 0.9V–90%VIN output. It features internal compensation, ±1.1% FB regulation accuracy over –40°C to +125°C, and peak efficiency of 94% in PWM mode-used in industrial power supplies and high-voltage single-board systems.
For engineers reviewing the MAX17503SATP+T datasheet, MAX17503SATP+T pinout, MAX17503SATP+T application, or MAX17503SATP+T equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternatives, and supply-chain support for production deployment.
Technical Context
The MAX17503SATP+T implements peak-current-mode control with selectable operation modes: PWM (constant frequency), PFM (pulse-skipping for light-load efficiency), and DCM (discontinuous conduction without pulse skipping). Its MODE pin directly configures the control scheme, enabling dynamic trade-offs between EMI control, efficiency, and transient response.
It integrates a 5V LDO (VCC) with 4.75V–5.25V output and 100mA current limit, supports external clock synchronization (1.1× to 1.4× fSW), and includes hiccup-mode overcurrent protection with autoretry startup. The device uses an exposed-pad 20-pin TQFN-EP (4mm × 4mm) package with θJA = 33°C/W on a four-layer board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports wide-range industrial and telecom inputs without pre-regulation. |
| Output Current | Up to 2.5A continuous - sufficient for point-of-load rails in base station and distributed supply applications. |
| Feedback Accuracy | ±1.1% over –40°C to +125°C - ensures stable regulation across extended ambient and junction temperatures. |
| Switching Frequency | 100kHz to 2.2MHz (adjustable via RT resistor or SYNC) - enables optimization of size, efficiency, and EMI. |
| Peak Efficiency | 94% (at 5V out, 24V in, PWM mode) - reduces thermal load and improves system-level power density. |
| Shutdown Current | 2.8µA (typ) - enables ultra-low-power standby in always-on industrial systems. |
| Minimum On-Time | 135ns - supports high VIN-to-VOUT ratios (e.g., 48V → 3.3V) without pulse skipping at full frequency. |
Pinout & Package
Package: 20-pin TQFN-EP (4mm × 4mm), RoHS-compliant, with exposed thermal pad connected to SGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3, VIN | Power input | High-current input path; must be decoupled with 2.2µF ceramic capacitor close to pins to suppress switching noise. |
| 4, EN/UVLO | Enable / UVLO threshold input | Resistor-divider programmable turn-on voltage (1.19–1.26V rising); enables controlled power sequencing. |
| 5, RESET | Open-drain power-good signal | Asserts low when FB falls below 92% VFB_REG; deasserts after 1024 cycles once FB rises above 95% - provides reliable system reset timing. |
| 6, SYNC | External clock input | Accepts 1.1×–1.4× fSW clock for EMI reduction and multi-rail synchronization. |
| 7, SS | Soft-start timing node | Capacitor-to-SGND sets ramp time; prevents input inrush and output overshoot during startup. |
| 9, FB | Feedback sensing input | Monitors output via resistor divider; 0.9V reference enables precise VOUT setting from 0.9V to 90%VIN. |
| 10, RT | Frequency programming | Resistor-to-SGND sets fSW from 100kHz to 2.2MHz; open-circuit defaults to ~500kHz. |
| 11, MODE | Control mode selection | GND = PWM (fixed fSW), open = PFM (light-load skipping), VCC = DCM (no skipping, disables negative inductor current). |
| 12, VCC | Integrated 5V LDO output | Bypassed with 2.2µF ceramic; powers internal circuitry and can supply light external loads (≤25mA). |
| 13, SGND | Analog ground reference | Separate from PGND to minimize noise coupling into feedback and oscillator circuits. |
| 14–16, PGND | Power ground return | Low-impedance path for high di/dt currents; must be tied to SGND only at VCC bypass capacitor. |
| 17–19, LX | Switching node | Connects to inductor; carries high dv/dt and di/dt - requires tight layout and minimal trace length. |
| 20, BST | Bootstrap capacitor connection | 0.1µF ceramic between BST and LX sustains high-side gate drive during 100% duty cycle. |
| EP | Exposed thermal pad | Mandatory connection to SGND with ≥6 thermal vias - critical for achieving rated 2.5A output and θJA = 33°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| All-ceramic capacitor solution | Requires as few as eight external components - eliminates electrolytics, improves reliability and temperature stability. |
| Internal loop compensation | Stable across full 0.9V–90%VIN output range - removes need for external compensation network and simplifies design validation. |
| Three selectable control modes | PWM/DCM/PFM via single MODE pin - allows runtime optimization of efficiency vs. EMI vs. transient response without firmware change. |
| Hiccup-mode overcurrent protection | Autoretry startup after fault clears - prevents thermal runaway during short-circuit or overload without manual reset. |
| Prebiased soft-start capability | Supports startup into precharged output - avoids reverse current flow and enables hot-swap compatibility. |
| Resistor-programmable EN/UVLO | Configurable turn-on threshold (e.g., 12V, 24V, 48V systems) - enables flexible power sequencing in multi-rail designs. |
Applications
| Industrial Power Supplies | Distributed Supply Regulation |
|---|---|
|
Use Scenario: 24V/48V factory automation I/O modules requiring isolated 3.3V/5V rails. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting wide-input bus to logic-level PoL voltages. Use Value: 94% peak efficiency and –40°C to +125°C operation ensure thermal margin and uptime in uncooled enclosures. |
Use Scenario: Multi-board telecom shelf with centralized 48V backplane powering individual line cards. IC Role / Device Role / Timing Role: Local step-down converter on each card, regulated by remote sense or local feedback. Use Value: Internal compensation and all-ceramic design reduce BOM count and layout sensitivity across variable load conditions. |
| Base Station Power Supplies | Wall Transformer Regulation |
|
Use Scenario: Remote radio unit (RRU) powered from 48V DC plant with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter feeding FPGA and RF ICs. Use Value: SYNC pin enables clock synchronization across multiple converters to collapse EMI peaks and pass CISPR-32 Class B. |
Use Scenario: Universal AC/DC adapter replacing linear regulators in legacy wall-wart designs. IC Role / Device Role / Timing Role: Primary DC-DC stage accepting rectified 100–370V DC from bridge rectifier. Use Value: 60V absolute max input rating and 2.5A output support compact, high-density replacement of bulky transformers. |
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, 1.5A output, 1.2MHz fixed fSW, no MODE pin for PFM/DCM selection. | Lacks multi-mode control and 2.5A capability - suitable only for lower-current automotive applications with fixed-frequency requirement. | Select if AEC-Q100 qualification and automotive temp range (–40°C to +125°C) are mandatory, and 1.5A suffices. |
| TPS54560BQDDARQ1 | 3.5V–60V input, 5A output, 100kHz–2.5MHz adjustable fSW, but requires external compensation and Schottky diode for PFM. | Higher current but larger solution size due to external compensation and diode - less optimal for space-constrained industrial PCBs. | Select if >2.5A output is required and design team has experience tuning external compensation networks. |
Compared with LM5164QPWPRQ1 and TPS54560BQDDARQ1, the MAX17503SATP+T delivers higher current in a smaller footprint with zero external compensation, making it optimal for cost-sensitive, thermally constrained industrial and telecom PoL designs where design-in simplicity and thermal performance are prioritized.
Availability
MAX17503SATP+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 RoHS-compliant packaging.
Supply support for MAX17503SATP+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 markets.
The MAX17503SATP+T belongs to the Himalaya series of high-voltage DC-DC regulators, designed specifically to replace discrete buck solutions with integrated MOSFETs, internal compensation, and robust protection - targeting cooler, smaller, and simpler industrial power supplies.
FAQ
What is the maximum output current capability of the MAX17503SATP+T under full thermal derating?
The MAX17503SATP+T delivers up to 2.5A continuously over its full operating temperature range (–40°C to +125°C ambient), verified with proper PCB thermal design: 20°C/W board thermal resistance, 4-layer stack-up, and ≥6 thermal vias under the exposed pad. At 70°C ambient, derating begins at 30.3mW/°C above that point, maintaining 2.5A output with adequate copper area.
How does the MODE pin affect efficiency and EMI performance in the MAX17503SATP+T?
The MODE pin selects between PWM (GND), PFM (open), and DCM (VCC). PWM ensures constant switching frequency for predictable EMI filtering but lowers light-load efficiency. PFM skips pulses at light loads for highest efficiency but creates variable-frequency noise. DCM maintains constant frequency while disabling negative inductor current - balancing EMI control and light-load efficiency better than PFM alone. All three modes are fully supported in the MAX17503SATP+T.
Can the MAX17503SATP+T operate with a 3.3V output from a 48V input, and what design considerations apply?
Yes, the MAX17503SATP+T supports 3.3V output from 48V input using its 0.9V feedback reference and resistor divider. Key considerations include using the minimum on-time (135ns) to avoid pulse skipping, selecting an inductor with appropriate saturation current (>3.7A peak), and ensuring the RT resistor sets fSW ≥500kHz to maintain control loop stability. Layout must minimize LX loop area to manage high dv/dt.
What is the function of the CF pin on the MAX17503SATP+T, and when must it be used?
The CF pin connects a capacitor to FB for loop compensation at switching frequencies below 500kHz. When fSW ≥500kHz (e.g., RRT ≤40.2kΩ), CF is left open. For lower frequencies (e.g., 100kHz–400kHz), a 100pF–1nF capacitor from CF to FB adjusts phase margin and ensures stable regulation - critical for maintaining 63.4° phase margin as shown in the Bode plot.
Does the MAX17503SATP+T support prebiased startup, and how is it enabled?
Yes, the MAX17503SATP+T supports prebiased startup. It is enabled automatically when the SS pin is driven high before EN/UVLO activation - the internal soft-start circuit detects the precharged output and ramps the FB reference without forcing reverse current through the output capacitor. This behavior is confirmed in Figures 4a–4d of the datasheet for both PWM and PFM modes.
MAX17503SATP+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:
- 2.5A
- Frequency - Switching:
- 100kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (4x4)
MAX17503SATP+T FAQ
1.How can I place an order for MAX17503SATP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17503SATP+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 MAX17503SATP+T reliable?
The price and inventory of MAX17503SATP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17503SATP+T is usually 5 days.
3.What payment methods are accepted for MAX17503SATP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17503SATP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17503SATP+T?
MAX17503SATP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17503SATP+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 MAX17503SATP+T?
For technical support, including MAX17503SATP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17503SATP+T requirements.
6.How does Aetrix verify that MAX17503SATP+T is sourced from the original manufacturer or authorized distributors?
All MAX17503SATP+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 MAX17503SATP+T meets industry standards.
7.What is the process for return or replacement of MAX17503SATP+T?
All MAX17503SATP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17503SATP+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 MAX17503SATP+T part is unused and in its original packaging.
Return procedure for MAX17503SATP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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