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Analog Devices Inc./Maxim Integrated MAX17503SATP+
- Part No.:
- MAX17503SATP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX17503SATP+.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,182
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Product details
Overview
MAX17503SATP+ 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+ datasheet, MAX17503SATP+ pinout, MAX17503SATP+ application, or MAX17503SATP+ equivalent, key selection criteria include its 20-pin TQFN-EP (4mm × 4mm) package, MODE-selectable PWM/PFM/DCM operation, 100kHz–2.2MHz adjustable switching frequency, and integrated 5V LDO (VCC) with 26.5–100mA current limit.
Technical Context
The MAX17503SATP+ employs peak-current-mode control with programmable MODE pin logic to select PWM (constant frequency), PFM (pulse-skipping for light-load efficiency), or DCM (discontinuous conduction without pulse skipping). Its internal compensation eliminates external loop components across the full 0.9V–90%VIN output range.
It integrates high-side (165–325mΩ) and low-side (80–150mΩ) nMOSFETs, supports external clock synchronization (1.1× to 1.4× fSW), and provides hiccup-mode overcurrent protection with 3.2–4.3A peak current limit and thermal shutdown at 165°C with 10°C hysteresis.
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 2.5A continuous - supports point-of-load conversion for FPGA, ASIC, and microprocessor core supplies. |
| Feedback Accuracy | ±1.1% over –40°C to +125°C - ensures stable output voltage under wide ambient and junction temperature variations. |
| Switching Frequency | 100kHz to 2.2MHz (RRT-programmable) - allows optimization of size (higher fSW) vs. efficiency (lower fSW) and EMI filtering. |
| Quiescent Current | 2.8µA typical in shutdown - minimizes standby power loss in always-on systems with battery backup. |
| Package | 20-pin TQFN-EP (4mm × 4mm, exposed pad) - provides low thermal resistance (θJA = 33°C/W) for high-power density layouts. |
| Efficiency | Peak 94% at 5V out, 24V in, 1A load - reduces heat generation and improves system-level thermal management. |
Pinout & Package
MAX17503SATP+ is housed in a compact, RoHS-compliant 20-pin TQFN-EP package (4mm × 4mm) with an exposed thermal pad connected to SGND. The package supports high-current routing via multiple VIN, PGND, and LX pins and enables efficient heat dissipation through PCB copper planes and thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3, VIN | Power input supply | Parallel-connected high-current inputs; require local 2.2µF ceramic decoupling to PGND for stability and EMI suppression. |
| 4, EN/UVLO | Enable and input UVLO threshold | Resistor-divider programmable turn-on threshold (1.19–1.26V rising); enables controlled power sequencing and brown-out protection. |
| 5, RESET | Open-drain power-good indicator | 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 synchronization input | Accepts 1.1× to 1.4× fSW external clock (VIH ≥ 2.1V) to eliminate beat frequencies in multi-regulator systems. |
| 7, SS | Soft-start timing control | Capacitor-to-SGND sets ramp time; prevents inrush current during startup and supports prebiased output conditions. |
| 8, CF | Compensation frequency adjustment | Capacitor-to-FB required only for fSW < 500kHz; omitted at ≥500kHz - simplifies design across frequency range. |
| 9, FB | Output voltage feedback sense | High-impedance input referenced to SGND; connects to resistor divider to set output from 0.9V to 90%VIN with ±1.1% accuracy. |
| 10, RT | Switching frequency programming | Resistor-to-SGND sets fSW (90kHz–2.2MHz); open-circuit defaults to ~500kHz - enables precise EMI and efficiency tuning. |
| 11, MODE | Control mode selection | GND = PWM (fixed fSW), open = PFM (light-load pulse skipping), VCC = DCM (no pulse skipping, disables negative inductor current). |
| 12, VCC | Integrated 5V LDO output | Supplies internal circuitry; requires 2.2µF ceramic bypass; delivers up to 100mA with dropout ≤4.2V at 20mA. |
| 13, SGND | Analog reference ground | Separate from PGND to minimize noise coupling into FB, SS, and MODE; tied to PGND at VCC bypass capacitor. |
| 14–16, PGND | Power ground return path | Low-impedance return for high di/dt currents from LX and VIN; must be routed with wide copper and connected to SGND at single point. |
| 17–19, LX | Switch node connection | High-current switching output; connects directly to inductor; requires short, low-inductance layout to minimize ringing and EMI. |
| 20, BST | Bootstrap capacitor terminal | Connects 0.1µF ceramic capacitor to LX; sustains gate drive for high-side MOSFET during 100% duty cycle operation. |
| EP | Exposed thermal pad | Internally connected to SGND; must be soldered to large PCB copper area with ≥6 thermal vias for optimal θJA and reliability. |
Key Features
| Feature | Design Value |
|---|---|
| All-ceramic capacitor solution | Requires as few as eight external components - eliminates electrolytics, reduces board area, and improves lifetime reliability. |
| Internal compensation | Stable operation across full 0.9V–90%VIN output range - removes need for external compensation network and simplifies design validation. |
| Three selectable control modes | PWM (constant fSW), PFM (high light-load efficiency), DCM (mid-efficiency, no pulse skipping) - enables dynamic trade-off between EMI, efficiency, and transient response. |
| Programmable soft-start and prebias support | Capacitor-controlled ramp time plus ability to start into prebiased output - prevents output overshoot and protects downstream loads. |
| Integrated 5V LDO (VCC) | Self-powered operation down to VIN = 4.5V; 4.75–5.25V output with 26.5–100mA current capability - eliminates need for external bias rail. |
| Hiccup-mode overcurrent protection | Auto-retry on overload with 32,768-cycle timeout - protects MOSFETs and inductor during sustained short-circuit events without latch-off. |
Applications
| Industrial Power Supplies | Distributed Supply Regulation |
|---|---|
Use Scenario: Primary DC-DC conversion in programmable logic controllers (PLCs) powered from 24V or 48V field buses. IC Role / Device Role / Timing Role: Synchronous buck regulator delivering 3.3V/2.5A or 5V/2.5A to microcontroller, I/O drivers, and communication interfaces. Use Value: Wide 4.5V–60V input range accommodates bus voltage fluctuations; ±1.1% FB accuracy maintains logic-level integrity across temperature. | Use Scenario: Local regulation on dense PCBs where centralized 12V/24V rails feed multiple point-of-load converters. IC Role / Device Role / Timing Role: Compact, high-efficiency buck stage converting 12V/24V to 1.8V, 3.3V, or 5V for FPGAs, ADCs, and sensors. Use Value: 4mm × 4mm TQFN-EP package and all-ceramic design enable ultra-compact footprint; 94% peak efficiency reduces local heating. |
| Base Station Power Supplies | Wall Transformer Regulation |
Use Scenario: Intermediate bus conversion in 4G/5G remote radio units (RRUs) with 48V input and 5V/3.3V outputs. IC Role / Device Role / Timing Role: High-voltage buck regulator supporting -40°C to +125°C ambient operation with hiccup-mode fault protection. Use Value: Thermal shutdown at 165°C and 10°C hysteresis ensures safe operation under airflow-limited enclosures; SYNC pin enables multi-rail coherence. | Use Scenario: Replacement for linear regulators or legacy buck ICs in AC-DC adapter secondary-side regulation (e.g., 12V–24V DC input to 5V USB-PD). IC Role / Device Role / Timing Role: Efficient, low-noise step-down converter eliminating heatsinks and improving energy efficiency compliance (e.g., DoE Level VI). Use Value: 2.8µA shutdown current extends battery backup life; PFM mode achieves >85% efficiency at 10mA load - critical for no-load standby. |
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, 1.2MHz max fSW, no integrated VCC LDO, requires external bootstrap diode. | Automotive AEC-Q100 qualified; lacks internal 5V LDO and soft-start programmability - needs additional bias and timing components. | Select LM5164QPWPRQ1 only for automotive environments requiring AEC-Q100; MAX17503SATP+ offers higher current, integrated bias, and simpler BOM for industrial use. |
| TPS54560DGQR | 3.5V–60V input, 5A output, 100kHz–2.5MHz fSW, no MODE pin for PFM/DCM, uses external compensation. | Higher output current but larger 10-pin MSOP package; lacks internal compensation and multi-mode control - less flexible for light-load efficiency tuning. | Choose TPS54560DGQR when >2.5A is required and layout space permits larger package; MAX17503SATP+ provides superior integration and thermal performance in 4mm × 4mm footprint. |
Compared with LM5164QPWPRQ1 and TPS54560DGQR, the MAX17503SATP+ delivers best-in-class integration (internal VCC LDO, compensation, MODE-selectable modes) in a thermally optimized 20-pin TQFN-EP, making it ideal for space-constrained industrial and telecom designs requiring 2.5A at high input voltage.
Availability
MAX17503SATP+ 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 guaranteed RoHS-compliant sourcing.
Supply support for MAX17503SATP+ 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 MAX17503SATP+ belongs to the Himalaya series of high-voltage DC-DC regulators engineered for cooler, smaller, and simpler power supply solutions in harsh industrial and telecom environments.
FAQ
What is the minimum on-time specification for MAX17503SATP+?
The MAX17503SATP+ has a minimum on-time of 135ns, enabling stable operation at high input-to-output voltage ratios and supporting high-frequency designs up to 2.2MHz. This parameter is confirmed in the Electrical Characteristics table on page 3 of the official datasheet and directly impacts achievable output voltage resolution and light-load behavior in PWM mode.
Does MAX17503SATP+ support synchronization to an external clock?
Yes, MAX17503SATP+ supports external clock synchronization via the SYNC pin, which accepts input frequencies from 1.1× to 1.4× the internally programmed switching frequency. This feature allows precise timing alignment across multiple regulators to suppress beat frequencies and simplify EMI filter design in multi-rail systems.
What is the function of the MODE pin on MAX17503SATP+?
The MODE pin on MAX17503SATP+ selects among three operating modes: grounded for constant-frequency PWM, open for pulse-skipping PFM (optimized for light-load efficiency), and connected to VCC for DCM (discontinuous conduction mode). Each mode alters inductor current waveform and efficiency profile - verified in Figures 4a–4d of the datasheet.
Can MAX17503SATP+ start up into a prebiased output?
Yes, MAX17503SATP+ supports prebiased power-up via its programmable soft-start circuitry and valley-current limiting architecture. When enabled, it avoids output voltage overshoot by controlling inrush current even when the output capacitor is initially charged - demonstrated in Figures toc16–toc17a of the datasheet under "Soft-Start with 2.5V Prebias" test conditions.
What thermal protection features does MAX17503SATP+ include?
MAX17503SATP+ includes thermal shutdown at +165°C with 10°C hysteresis, ensuring automatic recovery after cooling. It also features hiccup-mode overcurrent protection with a 32,768-cycle timeout, preventing thermal runaway during sustained overload. These protections are fully characterized over –40°C to +125°C ambient and validated per JEDEC JESD51-7 thermal testing methodology.
MAX17503SATP+ 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)
MAX17503SATP+ FAQ
1.How can I place an order for MAX17503SATP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17503SATP+ 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+ reliable?
The price and inventory of MAX17503SATP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17503SATP+ is usually 5 days.
3.What payment methods are accepted for MAX17503SATP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17503SATP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17503SATP+?
MAX17503SATP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17503SATP+ 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+?
For technical support, including MAX17503SATP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17503SATP+ requirements.
6.How does Aetrix verify that MAX17503SATP+ is sourced from the original manufacturer or authorized distributors?
All MAX17503SATP+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX17503SATP+?
All MAX17503SATP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17503SATP+, 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+ part is unused and in its original packaging.
Return procedure for MAX17503SATP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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