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Analog Devices Inc./Maxim Integrated MAX17682ATP+
- Part No.:
- MAX17682ATP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX17682ATP+.pdf
- Description:
- IC REG BUCK 5V 3.7A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:923
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Product details
Overview
The MAX17682ATP+ from Maxim Integrated is a high-voltage, isolated synchronous buck (iso-buck) DC-DC converter delivering up to 10W isolated power with primary-side feedback regulation, ±1.2% output voltage accuracy over -40°C to +125°C, 4.5V–42V input range, and 3.7A peak primary current capability-used in industrial process control and smart meter communication hubs.
For engineers reviewing the MAX17682ATP+ datasheet, MAX17682ATP+ pinout, MAX17682ATP+ application, or MAX17682ATP+ equivalent, key selection considerations include primary-side isolated regulation without optocoupler, programmable 100kHz–500kHz switching frequency via RT pin, EN/UVLO threshold adjustability, open-drain RESETB with 1024-cycle delay, and thermal shutdown at +165°C.
Technical Context
The MAX17682ATP+ implements peak-current-mode PWM control with integrated high-side and low-side NMOS switches (RDS(ON)H = 325 mΩ max, RDS(ON)L = 150 mΩ max), enabling synchronous iso-buck operation using an external transformer. It uses primary-side sensing to regulate the primary output voltage without secondary-side feedback components.
Its internal 5V LDO (VCC) supplies internal circuitry and gate drivers, features hiccup-mode overcurrent protection triggered by runaway current (>4.3A), FB undervoltage (<0.58V), or consecutive negative current limit events, and includes soft-start via external capacitor on SS pin with 5μA charging current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 42V - supports wide industrial bus voltages including 12V, 24V, and 36V systems without external pre-regulation. |
| Primary Output Accuracy | ±1.2% over -40°C to +125°C - ensures stable isolated rail generation across full industrial temperature range. |
| Peak Primary Current | 3.7A - enables up to 10W isolated output power with appropriate transformer turns ratio and layout. |
| Switching Frequency | 100kHz to 500kHz, adjustable via RT resistor - allows EMI optimization and transformer size reduction. |
| Efficiency | >90% peak - achieved via synchronous rectification and low RDS(ON) MOSFETs, reducing thermal load in compact layouts. |
| RESETB Delay | 1024 switching cycles after FB reaches 95% regulation - provides deterministic power-good timing for downstream sequencers. |
| Thermal Shutdown | +165°C with 10°C hysteresis - protects against sustained overload or poor heatsinking in sealed enclosures. |
| Shutdown Current | 2.8μA typical - minimizes standby power in always-on industrial monitoring nodes. |
Pinout & Package
Package: 20-pin TQFN (4mm × 4mm) with exposed pad connected to SGND for thermal dissipation. θJA = 33°C/W (multilayer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1–3) | Power input supply | High-current input node; all three pins must be shorted externally and decoupled with 2.2μF ceramic to PGND. |
| EN/UVLO (Pin 4) | Enable / input UVLO input | Logic-level enable with adjustable turn-on threshold (1.215V typ); also serves as programmable UVLO via resistive divider from VIN. |
| RESETB (Pin 5) | Open-drain power-good output | Asserts low when FB drops below 92.5% of setpoint; deasserts high-impedance after 1024 cycles once FB exceeds 95%. |
| SYNC (Pin 6) | External clock synchronization input | Accepts 1.1× to 1.4× programmed fSW; minimum pulse width 50ns - enables multi-converter phase alignment. |
| SS (Pin 7) | Soft-start timing control | 5μA current source charges external capacitor; sets monotonic VOUT ramp time independent of load. |
| COMP (Pin 8) | Error amplifier compensation node | Connect RC network to SGND to stabilize control loop; critical for transient response and phase margin (>66° confirmed). |
| FB (Pin 9) | Primary output voltage feedback | Senses regulated primary voltage via resistor divider; internal reference = 0.9V ±1.1% - determines output setpoint. |
| RT (Pin 10) | Frequency programming resistor | Resistor to SGND sets fSW: 82.5kΩ = 250kHz; open = default 250kHz; 40.2kΩ = 500kHz. |
| NC (Pin 11) | No connection | Must remain unconnected; no internal bond wire or circuitry attached. |
| VCC (Pin 12) | Internal 5V LDO output | Supplies internal logic and gate drivers; bypass with 2.2μF ceramic to SGND; current-limited to 100mA max. |
| SGND (Pin 13) | Analog ground reference | Reference for FB, COMP, SS, RT, SYNC; separate from PGND to minimize noise coupling into control loop. |
| PGND (Pins 14–16) | Power ground return | High-current return path for VIN, LX, and VCC bypass; connect externally to power ground plane and tie to SGND at VCC capacitor. |
| LX (Pins 17–19) | Switching node | Drives transformer primary; high-impedance during shutdown; requires low-inductance routing to minimize ringing. |
| BST (Pin 20) | Bootstrap capacitor connection | Connect 0.1μF ceramic between BST and LX to bias high-side gate driver; critical for proper NMOS turn-on. |
| EP | Exposed thermal pad | Must be soldered to SGND plane with ≥4 thermal vias - reduces θJC to 2°C/W and improves power handling. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side isolated regulation | Eliminates optocoupler and secondary-side TL431, reducing BOM count and improving long-term stability in medical and industrial isolation barriers. |
| Synchronous NMOS power stage | Integrated high-side (325 mΩ max) and low-side (150 mΩ max) switches reduce conduction loss vs. diode-based iso-buck, enabling >90% efficiency at full load. |
| Programmable soft-start | 5μA SS pin current enables precise inrush control via external capacitor - prevents input rail collapse during cold start in battery-powered meters. |
| Hiccup-mode overcurrent protection | Triggers on single runaway event (>4.3A), FB undervoltage (<0.58V), or 16 consecutive valley limit trips - limits fault energy and enables automatic recovery without system reset. |
| Adjustable EN/UVLO threshold | Configurable turn-on voltage (e.g., 15V or 28V) using external resistor divider - ensures reliable startup only when main supply is within safe operating window. |
| 100kHz–500kHz frequency tuning | RT pin resistor selects optimal switching frequency to balance EMI compliance, transformer size, and core loss in space-constrained applications. |
Applications
| Industrial Process Control | Communication Hub in Smart Meters |
|---|---|
Use Scenario: Isolated 5V/3.3V rails powering PLC I/O modules and analog sensor front-ends in 24V DC fieldbus environments. IC Role / Device Role / Timing Role: Primary-side iso-buck controller regulating isolated output via transformer-coupled primary voltage sensing. Use Value: Eliminates optocoupler aging drift and secondary-side feedback component tolerance stack-up, maintaining ±1.2% output accuracy over 10+ year field life. | Use Scenario: Generating isolated 3.3V supply for RF transceivers and metrology ADCs in ANSI C12.19-compliant smart meters. IC Role / Device Role / Timing Role: High-efficiency isolated DC-DC converter with programmable soft-start to meet strict inrush current limits during battery backup switchover. Use Value: 2.8μA shutdown current extends lithium-thionyl chloride battery life beyond 15 years in AMI endpoint deployments. |
| Isolated Power Supplies in Medical Equipment | Floating Power Supply Generation |
Use Scenario: Providing reinforced isolation for patient-connected monitors requiring 250VAC/1min creepage/clearance per IEC 60601-1. IC Role / Device Role / Timing Role: Iso-buck controller driving custom-wound transformer to generate certified isolated auxiliary rails without secondary-side components. Use Value: Achieves <100ppm/°C output drift and <10mVpp ripple - meets low-noise requirements for ECG front-end biasing and precision ADC references. | Use Scenario: Floating 12V supply for gate drivers in high-side IGBT stacks used in motor drives and UPS inverters. IC Role / Device Role / Timing Role: Primary-referenced iso-buck regulator generating galvanically isolated bias voltage referenced to switching node potential. Use Value: Enables direct transformer-coupled drive without level-shifting ICs, reducing propagation delay and improving shoot-through immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar iso-buck DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17681ATP+ | Same pinout and architecture but fixed 250kHz frequency (no RT pin); lower peak current (3.2A); identical thermal specs and package. | Best suited for cost-sensitive designs where frequency flexibility is unnecessary and 10W output is not required. | Select MAX17681ATP+ when fixed-frequency operation simplifies EMI filtering and peak load remains ≤8W. |
| LM5180QPWRQ1 | Automotive-grade flybuck controller (AEC-Q100); requires external high-side switch; no integrated low-side FET; wider temp range (-40°C to +150°C). | Targeted at automotive body electronics with ASIL-B functional safety requirements; lacks integrated power stage. | Choose LM5180QPWRQ1 only when AEC-Q100 qualification and external MOSFET control are mandatory - not a drop-in replacement. |
Compared with MAX17681ATP+, the MAX17682ATP+ adds RT-programmable frequency and 0.5A higher peak current for higher-power isolated rails; versus LM5180QPWRQ1, it offers full integration and industrial (not automotive) qualification, simplifying design but limiting safety-critical deployment.
Availability
MAX17682ATP+ is available at Aetrix Electronics and suitable for industrial process control, smart meter communication hubs, and isolated medical power supplies requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX17682ATP+ 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 high-performance analog and mixed-signal ICs for industrial, communications, and computing applications.
The MAX17682ATP+ belongs to Maxim's iso-buck DC-DC converter product line, engineered specifically to replace optocoupler-based isolated supplies in space-constrained industrial systems while maintaining precision regulation and robust fault protection.
FAQ
What is the maximum isolated output power achievable with the MAX17682ATP+?
The MAX17682ATP+ is rated for up to 10W isolated output power. This assumes proper transformer selection (≤1% leakage inductance), adequate PCB copper area for thermal dissipation, and operation within the 4.5V–42V input range with peak primary current limited to 3.7A. Derating is required above +70°C ambient due to 30.3mW/°C thermal derating slope.
Does the MAX17682ATP+ require an optocoupler for feedback isolation?
No, the MAX17682ATP+ does not require an optocoupler. It uses primary-side regulation, measuring the primary output voltage directly via the FB pin and internal 0.9V reference. This eliminates optocoupler aging, gain drift, and secondary-side component count - a key advantage for long-life industrial and medical applications.
How is the switching frequency set on the MAX17682ATP+?
The switching frequency of the MAX17682ATP+ is set by connecting a resistor from the RT pin to SGND. For example, 82.5kΩ yields 250kHz, 40.2kΩ yields 500kHz, and leaving RT open defaults to 250kHz. The relationship follows fSW(kHz) ≈ 21 × 10³ / RRT(kΩ), enabling precise EMI and transformer design optimization.
What is the function of the RESETB pin on the MAX17682ATP+?
The RESETB pin on the MAX17682ATP+ is an open-drain power-good signal. It asserts low when the FB voltage falls below 92.5% of its regulated value and deasserts (high-impedance) 1024 switching cycles after FB rises above 95% of regulation. An external pull-up resistor is required, and RESETB also goes low during thermal shutdown.
Can the MAX17682ATP+ operate with input voltages below 4.5V?
No, the MAX17682ATP+ has a specified minimum input voltage of 4.5V. Operation below this violates Absolute Maximum Ratings and may result in improper startup, unstable regulation, or failure to exit UVLO. The EN/UVLO pin can be configured to enable the device only above a higher threshold (e.g., 12V), but the VIN supply itself must remain ≥4.5V whenever enabled.
MAX17682ATP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3.7A
- Frequency - Switching:
- 100kHz ~ 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (4x4)
MAX17682ATP+ FAQ
1.How can I place an order for MAX17682ATP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17682ATP+ 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 MAX17682ATP+ reliable?
The price and inventory of MAX17682ATP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17682ATP+ is usually 5 days.
3.What payment methods are accepted for MAX17682ATP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17682ATP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17682ATP+?
MAX17682ATP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17682ATP+ 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 MAX17682ATP+?
For technical support, including MAX17682ATP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17682ATP+ requirements.
6.How does Aetrix verify that MAX17682ATP+ is sourced from the original manufacturer or authorized distributors?
All MAX17682ATP+ 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 MAX17682ATP+ meets industry standards.
7.What is the process for return or replacement of MAX17682ATP+?
All MAX17682ATP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17682ATP+, 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 MAX17682ATP+ part is unused and in its original packaging.
Return procedure for MAX17682ATP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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