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Analog Devices Inc./Maxim Integrated MAX17503ATP+T
- Part No.:
- MAX17503ATP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX17503ATP+T.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,680
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Product details
Overview
MAX17503ATP+T 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%. Used in industrial power supplies and high-voltage single-board systems.
For engineers reviewing the MAX17503ATP+T datasheet, MAX17503ATP+T pinout, MAX17503ATP+T application, or MAX17503ATP+T equivalent, key selection considerations include its 20-pin TQFN-EP package, MODE-selectable PWM/PFM/DCM operation, 100kHz–2.2MHz adjustable switching frequency, 135ns minimum on-time, and integrated 5V LDO (VCC) with 26.5–100mA current limit.
Technical Context
The MAX17503ATP+T employs peak-current-mode control with MODE pin configurable operation: PWM for constant-frequency full-load performance, PFM for pulse-skipping light-load efficiency, and DCM for intermediate efficiency 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 - supports wide industrial and telecom input rails without pre-regulation. |
| Output Current | Up to 2.5A continuous - delivers full rated load over full temperature range (–40°C to +125°C). |
| Output Voltage Range | 0.9V to 90%VIN - programmable via resistor divider on FB pin; enables adaptive output scaling. |
| Feedback Accuracy | ±1.1% over –40°C to +125°C - ensures stable regulation in harsh ambient conditions. |
| Switching Frequency | 100kHz to 2.2MHz (adjustable via RT resistor or SYNC) - allows optimization of size, EMI, and efficiency. |
| Min On-Time | 135ns - enables high VIN-to-low VOUT conversion (e.g., 48V→3.3V) at 500kHz without duty-cycle limitation. |
| Quiescent Current (PFM) | 118µA typical - extends battery life in always-on systems with light-load standby. |
| Shutdown Current | 2.8µA typical - minimizes system leakage when disabled via EN/UVLO pin. |
Pinout & Package
Package: 20-pin TQFN-EP (4mm × 4mm, exposed pad), RoHS-compliant, thermal resistance θJA = 33°C/W (4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3, VIN | Power input supply | High-current input path; must be decoupled with 2.2µF ceramic capacitor close to pins. |
| 4, EN/UVLO | Enable / input UVLO threshold | Resistor-divider programmable turn-on voltage (1.19–1.26V rising); supports sequenced startup. |
| 5, RESET | Open-drain power-good signal | Asserts low if FB drops below 92% regulation; deasserts after 1024 cycles once FB rises above 95%. |
| 6, SYNC | External clock synchronization input | Accepts 1.1×–1.4× fSW external clock; enables multi-rail phase alignment and EMI reduction. |
| 7, SS | Soft-start timing control | Capacitor-to-SGND sets ramp time; prevents input inrush and output overshoot during startup. |
| 8, CF | Compensation frequency adjustment | Capacitor-to-FB required only for fSW < 500kHz; omitted at ≥500kHz due to internal compensation. |
| 9, FB | Output voltage feedback sense | 0.9V reference; connects to resistor divider for precise output setting and monitoring. |
| 10, RT | Switching frequency set resistor | Resistor-to-SGND selects fSW from 90kHz to 2.2MHz; open = default 500kHz. |
| 11, MODE | Control mode selection | Open = PFM, GND = PWM, VCC = DCM - configures light-load behavior without firmware. |
| 12, VCC | Integrated 5V LDO output | Supplies internal circuitry; bypassed with 2.2µF ceramic; 4.75–5.25V output, 26.5–100mA current limit. |
| 13, SGND | Analog ground reference | Reference for FB, SS, CF, MODE, SYNC, RT; separate from PGND to minimize noise coupling. |
| 14–16, PGND | Power ground return | High-current return path for MOSFETs and LX; must connect to power plane with low-inductance layout. |
| 17–19, LX | Switching node | Connects to inductor; carries high di/dt; requires short, wide copper trace and thermal vias to EP. |
| 20, BST | Bootstrap capacitor connection | 0.1µF ceramic between BST and LX powers high-side gate driver; critical for reliable high-side conduction. |
| EP | Exposed thermal pad | Must be soldered to SGND plane with ≥6 thermal vias; primary path for heat dissipation (θJC = 2°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| All-ceramic capacitor solution | Requires as few as eight external components - eliminates electrolytics, reduces footprint and aging risk. |
| Internal loop compensation | Stable across entire 0.9V–90%VIN output range - removes need for external compensation network. |
| Three selectable operating modes | PWM (constant frequency), PFM (pulse skipping), DCM (no pulse skip, no reverse inductor current) - enables efficiency vs. EMI trade-off tuning. |
| Programmable soft-start and prebiased startup | Capacitor-controlled ramp and support for powered-up outputs - prevents damage to precharged downstream rails. |
| Hiccup-mode overcurrent protection | Auto-retry after fault clearance - protects against sustained overload without latch-off or manual reset. |
| Resistor-programmable EN/UVLO threshold | Configurable turn-on voltage (e.g., 12V, 24V, 48V systems) - enables flexible power sequencing and brownout immunity. |
Applications
| Industrial Power Supplies | Distributed Supply Regulation |
|---|---|
Use Scenario: Powering PLC I/O modules, motor drives, and sensors in factory automation cabinets with 24V/48V bus inputs. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting 48V bus to 3.3V/5V/12V logic and analog rails. Use Value: 94% peak efficiency and –40°C to +125°C operation ensure reliability in uncooled enclosures; hiccup protection sustains uptime during short-circuit events. | Use Scenario: Local point-of-load conversion on large PCBs with long power distribution traces (e.g., base station RF cards). IC Role / Device Role / Timing Role: Distributed buck converter placed near high-current loads to minimize IR drop and noise coupling. Use Value: 135ns min on-time enables 48V→3.3V conversion at 500kHz; TQFN-EP package with EP thermal pad maintains junction temp <150°C under 2.5A load. |
| Base Station Power Supplies | Wall Transformer Regulation |
Use Scenario: Intermediate conversion stage in macrocell or small-cell radio units requiring clean, efficient 5V/12V from 48V backplane. IC Role / Device Role / Timing Role: High-voltage synchronous buck providing isolated or non-isolated secondary rail with tight regulation. Use Value: ±1.1% FB accuracy and 100kHz–2.2MHz sync capability meet stringent spectral mask and transient response requirements for RF subsystems. | Use Scenario: Replacing linear regulators or legacy buck ICs in AC/DC adapter secondary-side regulation (e.g., 12V→5V USB-PD compliant output). IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter replacing discrete solutions in space-constrained wall adapters. Use Value: All-ceramic design (8 components) and 4mm×4mm TQFN reduce BOM count and volume; PFM mode achieves >85% efficiency at 10mA load. |
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 integrated VCC LDO, requires external bootstrap diode. | Automotive AEC-Q100 qualified; lacks internal 5V LDO and RESET pin; lower current rating. | Select for automotive environments where qualification is mandatory; not drop-in due to missing VCC and RESET functions. |
| TPS54560DGQR | 3.5V–60V input, 5A output, 135ns min on-time, external compensation, no MODE pin for PFM/DCM. | Higher current, wider input range, but requires external loop compensation and lacks programmable light-load modes. | Select when >2.5A output or external compensation flexibility is needed; adds design complexity and component count. |
Compared with LM5164QPWPRQ1 and TPS54560DGQR, the MAX17503ATP+T uniquely integrates a 5V VCC LDO, open-drain RESET, and MODE-selectable light-load operation - reducing external parts and simplifying power sequencing in industrial and telecom systems without automotive qualification requirements.
Availability
MAX17503ATP+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 MAX17503ATP+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) designs precision analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The MAX17503ATP+T belongs to the Himalaya series of high-voltage DC-DC regulators, engineered to deliver cooler, smaller, and simpler power supply solutions for demanding industrial and telecom infrastructure.
FAQ
What is the maximum output current capability of the MAX17503ATP+T across temperature?
The MAX17503ATP+T delivers up to 2.5A continuous output current over the full ambient temperature range of –40°C to +125°C. This rating is validated by thermal design using the 4mm × 4mm TQFN-EP package with exposed pad and proper PCB copper area and thermal vias, ensuring junction temperature remains below +150°C under worst-case conditions.
How does the MODE pin affect efficiency and EMI performance in the MAX17503ATP+T?
The MODE pin on the MAX17503ATP+T selects between PWM (GND), PFM (open), and DCM (VCC) operation. PWM provides constant-frequency switching ideal for EMI filtering; PFM skips pulses at light loads for highest efficiency but increases spectral spread; DCM maintains constant frequency while disabling negative inductor current - offering a balanced trade-off for noise-sensitive applications needing >85% light-load efficiency.
Can the MAX17503ATP+T regulate output voltages below 1V?
No - the MAX17503ATP+T has a fixed 0.9V internal feedback reference and is specified for output voltages from 0.9V to 90% of VIN. It cannot regulate below 0.9V, as the FB pin's regulation threshold is trimmed to 0.9V ±1.1% over temperature; attempting sub-0.9V operation results in loss of regulation and potential instability.
What is the purpose of the CF pin on the MAX17503ATP+T, and when is it used?
The CF pin on the MAX17503ATP+T is used for loop compensation adjustment only when the switching frequency is set below 500kHz via the RT resistor. A capacitor is connected from CF to FB to optimize phase margin; for fSW ≥ 500kHz (including default 500kHz with RT open), CF is left unconnected because internal compensation is fully optimized across the output voltage range.
Does the MAX17503ATP+T support external clock synchronization, and what is its capture range?
Yes - the MAX17503ATP+T supports external clock synchronization via the SYNC pin. Its capture range is 1.1× to 1.4× the internally set switching frequency (determined by RT resistor or default 500kHz). For example, with RT set to 40.2kΩ (500kHz), SYNC accepts an external clock from 550kHz to 700kHz, enabling precise multi-rail timing alignment and deterministic EMI reduction.
MAX17503ATP+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)
MAX17503ATP+T FAQ
1.How can I place an order for MAX17503ATP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17503ATP+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 MAX17503ATP+T reliable?
The price and inventory of MAX17503ATP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17503ATP+T is usually 5 days.
3.What payment methods are accepted for MAX17503ATP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17503ATP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17503ATP+T?
MAX17503ATP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17503ATP+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 MAX17503ATP+T?
For technical support, including MAX17503ATP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17503ATP+T requirements.
6.How does Aetrix verify that MAX17503ATP+T is sourced from the original manufacturer or authorized distributors?
All MAX17503ATP+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 MAX17503ATP+T meets industry standards.
7.What is the process for return or replacement of MAX17503ATP+T?
All MAX17503ATP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17503ATP+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 MAX17503ATP+T part is unused and in its original packaging.
Return procedure for MAX17503ATP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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