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Analog Devices Inc./Maxim Integrated MAX17503ATP+
- Part No.:
- MAX17503ATP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX17503ATP+.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,713
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Product details
Overview
The MAX17503ATP+ from Maxim Integrated is a high-efficiency, 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%. It is used in industrial power supplies and high-voltage single-board systems requiring compact, thermally robust regulation.
For engineers reviewing the MAX17503ATP+ datasheet, MAX17503ATP+ pinout, MAX17503ATP+ application, or MAX17503ATP+ equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative parts with documented differences, and supply support for volume OEM deployment.
Technical Context
The MAX17503ATP+ employs peak-current-mode control with user-selectable PWM, PFM, or DCM operation via the MODE pin. Its internal compensation eliminates external loop components across the full 0.9V–90%VIN output range, enabling stable all-ceramic capacitor designs with as few as eight external parts.
It integrates a 5V LDO (VCC) with 4.75V–5.25V output and 26.5–100mA current limit, a programmable soft-start (4.7–5.3µA charging current), and hiccup-mode overcurrent protection with 3.2–4.3A peak current limit. The RESET pin provides open-drain power-good signaling with 92–94.6% VFB-OKF assertion threshold and 1024-cycle deassertion delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports wide-input industrial and telecom rails without pre-regulation. |
| Output Current | Up to 2.5A continuous - delivers full rated load over –40°C to +125°C ambient. |
| Feedback Accuracy | ±1.1% over –40°C to +125°C - ensures tight output regulation across temperature without calibration. |
| Switching Frequency | 100kHz to 2.2MHz (adjustable via RT resistor or SYNC) - enables optimization of size vs. EMI vs. light-load efficiency. |
| Peak Efficiency | 94% - reduces thermal stress and improves system-level power density in space-constrained designs. |
| Shutdown Current | 2.8µA (typ) - enables ultra-low-power standby in battery-backed or energy-harvesting systems. |
| Min On-Time | 135ns - supports high VIN-to-low VOUT conversion ratios (e.g., 48V→3.3V) at high frequency without pulse skipping. |
Pinout & Package
Package: 20-pin TQFN-EP (4mm × 4mm) with exposed pad, RoHS-compliant, θJA = 33°C/W (4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3 VIN | Power input | High-current input path; must be decoupled with 2.2µF ceramic close to pins to suppress ripple and ensure stability. |
| 4 EN/UVLO | Enable/UVLO control | Resistor-programmable turn-on threshold (1.19–1.26V rising); pull to VIN for always-on operation. |
| 5 RESET | Open-drain power-good | Asserts low when FB < 92% regulation; deasserts after 1024 cycles once FB > 95% - provides reliable system sequencing. |
| 6 SYNC | External clock input | Accepts 1.1× to 1.4× fSW external clock (VIH ≥ 2.1V) for EMI reduction or multi-phase synchronization. |
| 7 SS | Soft-start timing | Capacitor-to-SGND sets ramp time; 4.7–5.3µA internal current enables precise inrush control. |
| 9 FB | Voltage feedback | 0.89–0.91V reference; connects to resistor divider - sets output with ±1.1% accuracy over full temperature range. |
| 10 RT | Frequency programming | Resistor-to-SGND selects fSW from 100kHz to 2.2MHz; open = ~500kHz default. |
| 11 MODE | Control mode selection | GND = PWM (fixed freq), open = PFM (pulse skip), VCC = DCM (no skip, disable reverse current) - selectable per load profile. |
| 12 VCC | Integrated LDO output | 5V ±5% @ up to 100mA; powers internal circuitry and can bias external components. |
| 13 SGND | Analog ground | Reference for FB, SS, CF, RT, MODE, SYNC - must be star-connected to PGND at VCC bypass cap. |
| 14–16 PGND | Power ground | High-current return for LX and VIN; connect externally to solid ground plane with multiple vias. |
| 17–19 LX | Switch node | Drives external inductor; requires low-inductance layout and 0.1µF BST capacitor to LX. |
| 20 BST | Bootstrap supply | Connects 0.1µF ceramic to LX - sustains high-side gate drive during 100% duty cycle. |
Key Features
| Feature | Design Value |
|---|---|
| All-ceramic capacitor solution | Enables ultra-compact PCB layout with only eight external components - no electrolytics or tantalums required. |
| Internal compensation | Eliminates external compensation network across entire 0.9V–90%VIN output range - reduces BOM count and design risk. |
| Three-mode control (PWM/PFM/DCM) | Allows dynamic trade-off between light-load efficiency (PFM), EMI control (PWM), and transient response (DCM) without hardware change. |
| Hiccup-mode overcurrent protection | Autoretry shutdown on overload (3.2–4.3A peak limit) - protects MOSFETs and inductor during sustained short-circuit events. |
| Prebiased soft-start | Supports safe startup into precharged output rails - prevents reverse current flow and avoids output voltage undershoot. |
Applications
| Industrial Power Supplies | Distributed Supply Regulation |
|---|---|
Use Scenario: DIN-rail mounted 24V/48V input power module supplying 5V/3.3V to PLC I/O and communication interfaces. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering 2.5A at 5V with hiccup-mode fault protection and wide-temp reliability. Use Value: Eliminates need for external compensation and Schottky diode, reducing footprint by >30% versus discrete solutions. | Use Scenario: Point-of-load regulation on a high-voltage backplane (e.g., 36V or 48V) powering FPGA core and I/O rails. IC Role / Device Role / Timing Role: Synchronous buck converter with adjustable switching frequency (100kHz–2.2MHz) for EMI compliance in dense board layouts. Use Value: 94% peak efficiency and 2.8µA shutdown current extend uptime in fanless or thermally constrained enclosures. |
| Base Station Power Supplies | Wall Transformer Regulation |
Use Scenario: Remote radio unit (RRU) power stage converting 48V telecom rail to 3.3V for RF front-end ICs. IC Role / Device Role / Timing Role: High-voltage buck with 135ns min on-time supporting 48V→3.3V conversion at 1MHz without pulse skipping. Use Value: Stable operation across –40°C to +125°C ambient ensures reliability in outdoor uncontrolled environments. | Use Scenario: Universal-input AC/DC adapter secondary-side regulation delivering 5V/2.5A USB-C PD output. IC Role / Device Role / Timing Role: Synchronous buck with programmable EN/UVLO and soft-start - enables clean turn-on and brownout recovery. Use Value: Internal 5V LDO (VCC) powers auxiliary circuits, eliminating need for separate bias supply and reducing component count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5V–65V input, 1.5A output, 100ns min on-time, no internal compensation - requires external loop components. | Automotive AEC-Q100 qualified; lacks RESET pin and hiccup-mode protection - less suitable for industrial safety-critical use. | Select for automotive-grade designs where qualification outweighs feature set; not drop-in due to different pinout and compensation requirements. |
| TPS54560BQDDARQ1 | 3.5V–60V input, 5A output, 135ns min on-time, integrated compensation, but no MODE pin for PFM/DCM selection - fixed PWM-only operation. | Also AEC-Q100 qualified; higher current rating but larger package (SOIC-8 vs. TQFN-20) and lower light-load efficiency due to lack of PFM. | Choose when higher output current is needed and light-load efficiency is secondary; requires PCB redesign due to different package and pin assignment. |
Compared with LM5164QPWPRQ1 and TPS54560BQDDARQ1, the MAX17503ATP+ offers superior light-load efficiency via selectable PFM/DCM modes, integrated power-good signaling, and guaranteed ±1.1% regulation accuracy over full temperature - making it optimal for thermally demanding industrial point-of-load applications where design simplicity and long-term stability are critical.
Availability
MAX17503ATP+ is available at Aetrix Electronics and suitable for industrial power supplies, distributed supply regulation, and base station power supplies requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for MAX17503ATP+ 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 MAX17503ATP+ belongs to the Himalaya series of high-voltage DC-DC regulators engineered for cooler, smaller, and simpler power supply designs - specifically targeting high-input-voltage industrial and telecom systems where reliability and minimal external components are essential.
FAQ
What is the maximum output current capability of the MAX17503ATP+ across temperature?
The MAX17503ATP+ delivers up to 2.5A continuous output current over the full –40°C to +125°C ambient operating temperature range. This rating is validated with proper thermal design using the 4mm × 4mm TQFN-EP package and its exposed pad connected to a multilayer PCB with thermal vias. Derating is not required within this range when θJA ≤ 33°C/W is maintained.
Does the MAX17503ATP+ require external compensation components?
No, the MAX17503ATP+ features built-in compensation that is valid across its entire output voltage range (0.9V to 90%VIN). This eliminates the need for external Type-II or Type-III compensation networks, enabling stable all-ceramic capacitor designs with as few as eight total external components - significantly simplifying layout and reducing BOM cost.
How does the MODE pin affect efficiency and operation of the MAX17503ATP+?
The MODE pin configures the MAX17503ATP+ into one of three operating modes: GND = PWM (constant frequency, best EMI control), open = PFM (pulse-skipping at light loads, highest light-load efficiency), or VCC = DCM (no pulse skipping but disables negative inductor current, balancing efficiency and transient response). Each mode directly impacts quiescent current - e.g., IQ_PFM = 118µA vs. IQ_PWM = 9.5mA - allowing optimization per application load profile.
What is the function and timing behavior of the RESET pin on the MAX17503ATP+?
The RESET pin on the MAX17503ATP+ is an open-drain output that asserts low when the FB voltage falls below 92–94.6% of its regulated value (VFB-OKF), indicating loss of regulation. It deasserts high 1024 switching cycles after FB rises above 93.8–97.8% of regulation (VFB-OKR), providing a deterministic, glitch-free power-good signal for system sequencing and microcontroller reset coordination.
Can the MAX17503ATP+ be synchronized to an external clock, and what are the valid frequency and voltage requirements?
Yes, the MAX17503ATP+ supports external clock synchronization via the SYNC pin. It accepts an external clock with frequency between 1.1× and 1.4× the internally set fSW (e.g., 550kHz–700kHz for a 500kHz nominal setting). The input threshold is VIH ≥ 2.1V and VIL ≤ 0.8V, with minimum pulse width of 50ns. This enables EMI reduction through spread-spectrum alignment or multi-phase interleaving in complex power systems.
MAX17503ATP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Himalaya
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tray
- 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)
MAX17503ATP+ FAQ
1.How can I place an order for MAX17503ATP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17503ATP+ 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 MAX17503ATP+ reliable?
The price and inventory of MAX17503ATP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17503ATP+ is usually 5 days.
3.What payment methods are accepted for MAX17503ATP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17503ATP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17503ATP+?
MAX17503ATP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17503ATP+ 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 MAX17503ATP+?
For technical support, including MAX17503ATP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17503ATP+ requirements.
6.How does Aetrix verify that MAX17503ATP+ is sourced from the original manufacturer or authorized distributors?
All MAX17503ATP+ 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 MAX17503ATP+ meets industry standards.
7.What is the process for return or replacement of MAX17503ATP+?
All MAX17503ATP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17503ATP+, 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 MAX17503ATP+ part is unused and in its original packaging.
Return procedure for MAX17503ATP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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