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Analog Devices Inc./Maxim Integrated MAX17761ATC+
- Part No.:
- MAX17761ATC+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
MAX17761ATC+.pdf
- Description:
- IC REG BUCK ADJ 1A 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,341
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Product details
Overview
The MAX17761ATC+ from Maxim Integrated is a high-efficiency, synchronous step-down DC-DC converter with integrated high-side pMOS and low-side nMOS FETs, operating from 4.5V to 76V input and delivering up to 1A output current. It features peak-current-mode control, ±1.5% feedback regulation accuracy over –40°C to +125°C, programmable output voltage (0.8V to 90% of VIN), and selectable PWM/PFM operation - used in industrial control power supplies and high-voltage single-board systems.
For engineers reviewing the MAX17761ATC+ datasheet, MAX17761ATC+ pinout, MAX17761ATC+ application, or MAX17761ATC+ equivalent, key selection considerations include its wide 4.5–76V input range, internal MOSFETs eliminating external Schottky diodes, adjustable 200–600kHz switching frequency, programmable current limit via MODE/ILIM resistor, and built-in RESET with 92–95% FB monitoring thresholds.
Technical Context
The MAX17761ATC+ implements a peak-current-mode control architecture with an internal transconductance error amplifier, slope compensation generator, and PWM comparator. Its dual LDO structure powers VCC either from VIN (via internal pMOS LDO) or EXTVCC (via auxiliary LDO), with automatic switchover at ~4.74V/4.44V thresholds to maximize efficiency across input ranges.
It supports monotonic startup into prebiased loads by disabling both FETs until commanded by the PWM comparator, and provides robust protection including thermal shutdown at +160°C (20°C hysteresis), overcurrent detection with separate positive/negative current limits, and open-drain RESET with 2.1ms delay after FB reaches 95% regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 76V - enables direct use with 24V/48V industrial rails and telecom -48V systems without pre-regulation. |
| Output Current | Up to 1A continuous - sufficient for point-of-load regulation in FPGA I/O, microcontroller cores, and sensor subsystems. |
| Feedback Accuracy | ±1.5% over –40°C to +125°C - ensures stable output under full industrial ambient temperature range without calibration. |
| Switching Frequency | 200kHz to 600kHz, adjustable via RT/SYNC resistor or external clock sync - allows EMI optimization and inductor size trade-offs. |
| Peak Efficiency | >90% - achieved using synchronous rectification and low RDS-ON MOSFETs (0.9Ω high-side, 0.275Ω low-side typical). |
| Shutdown Current | 5µA - minimizes system standby power in battery-backed or energy-sensitive applications. |
| VCC Output | 5V ±5%, 13mA max - powers internal circuitry and can supply light external loads, reducing need for auxiliary LDOs. |
Pinout & Package
The MAX17761ATC+ is housed in a 12-pin, 3mm × 3mm TDFN package with exposed pad (EP) connected to SGND. Thermal performance is optimized via EP-to-ground-plane connection using multiple thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | High-voltage input supply | Accepts 4.5–76V; requires local 2.2µF ceramic decoupling to PGND for stability and EMI reduction. |
| PGND (Pin 2) | Power ground return | Carries high-frequency inductor current; must be tied to VCC bypass capacitor ground path and separated from analog ground at single point. |
| VCC (Pin 3) | Internal 5V LDO output | Supplies internal logic and gate drivers; bypassed with 1µF ceramic to SGND; UVLO triggers shutdown below 3.8V. |
| EN/UVLO (Pin 4) | Enable and input undervoltage lockout | Turns device on when >1.215V; threshold programmable via resistor divider; floating = always-on mode. |
| RESET (Pin 5) | Open-drain output voltage monitor | Asserts low when FB falls below 92% of setpoint; releases high 2.1ms after FB rises above 95% - enables system reset sequencing. |
| RT/SYNC (Pin 6) | Frequency programming/synchronization | Sets switching frequency (200–600kHz) with resistor to SGND or accepts external clock (1.15–1.4× fSW) for noise reduction. |
| EXTVCC (Pin 7) | Auxiliary VCC input | Enables higher efficiency at high VIN by powering VCC from output rail; switchover occurs at ~4.74V rising / ~4.44V falling. |
| FB (Pin 8) | Output voltage feedback input | Monitors resistive divider from VOUT; regulates to 0.8V reference with ±1.5% accuracy - sets output from 0.8V to 90% of VIN. |
| SS (Pin 9) | Soft-start timing control | Connects to SGND via capacitor (e.g., 33nF for 5.3ms); controls ramp rate to prevent inrush current into large output capacitors. |
| MODE/ILIM (Pin 10) | Operation mode and current limit select | Resistor to SGND selects PWM/PFM mode and peak current limit (1.14A or 1.6A) - not dynamically reconfigurable post-power-up. |
| SGND (Pin 11) | Analog ground reference | Reference for FB, SS, MODE/ILIM, RESET; must be connected to PGND at single point near VCC bypass capacitor. |
| LX (Pin 12) | Switching node | Connects to inductor switch node; carries high di/dt; layout requires short, low-inductance trace to minimize ringing and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFET integration | Eliminates external Schottky diode and associated conduction losses - improves full-load efficiency and reduces BOM count. |
| Programmable PFM/PWM operation | Enables high light-load efficiency (PFM) or constant-frequency EMI control (PWM) - selected at startup via MODE/ILIM resistor. |
| Adjustable soft-start and prebiased startup | Prevents output voltage collapse during hot-plug or shared-rail scenarios - ensures monotonic rise even when VOUT is initially non-zero. |
| Built-in output voltage monitoring with RESET | Provides system-level power-good signaling without external supervisor IC - simplifies reset management in industrial controllers. |
| Wide input range with internal LDO switchover | Reduces power dissipation at high VIN by sourcing VCC from EXTVCC instead of VIN - extends thermal margin in 48V+ applications. |
Applications
| Industrial Control Power Supplies | General-Purpose Point-of-Load |
|---|---|
Use Scenario: Powering PLC I/O modules, motor driver logic, and fieldbus interface circuits in factory automation cabinets with 24V/48V DC rails. IC Role / Device Role / Timing Role: Primary buck regulator converting unregulated 48V bus to 5V/3.3V for microcontrollers, ADCs, and isolated gate drivers. Use Value: High input voltage tolerance eliminates need for intermediate pre-regulators; ±1.5% regulation ensures accurate sensor signal conditioning across temperature. | Use Scenario: Local regulation for FPGA core or I/O banks on high-density PCBs where space and thermal density are constrained. IC Role / Device Role / Timing Role: Compact, self-contained DC-DC stage delivering 1A at 1.2V/1.8V/3.3V with minimal external components. Use Value: All-ceramic capacitor support and internal compensation reduce footprint; 3mm × 3mm TDFN enables placement near load for lowest impedance path. |
| Distributed Supply Regulation | Basestation Power Supplies |
Use Scenario: Secondary regulation in telecom or networking equipment where intermediate 12V/5V rails feed multiple downstream converters. IC Role / Device Role / Timing Role: Efficient intermediate-stage buck converter stepping down 12V to 5V/3.3V for ASICs, PHYs, and memory interfaces. Use Value: Adjustable frequency avoids beat frequencies with other converters; PFM mode cuts quiescent current during low-traffic standby periods. | Use Scenario: Power conversion in 4G/5G remote radio units (RRUs) requiring reliable operation at extended temperature and high input voltage transients. IC Role / Device Role / Timing Role: Main 48V-to-5V/3.3V converter supporting RF front-end bias, digital baseband, and cooling fan control. Use Value: –40°C to +125°C ambient rating and thermal shutdown with hysteresis ensure reliability in outdoor enclosures; 76V abs max rating withstands load-dump surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5–65V input, 1A, integrated FETs; uses voltage-mode control; no PFM mode; 1.2V FB reference vs. 0.8V. | Automotive AEC-Q100 qualified; lacks RESET output and EXTVCC switchover; lower max input voltage. | Choose LM5164QPWPRQ1 only if automotive qualification is mandatory and 65V max input suffices. |
| TPS54160AIDR | 3.5–60V input, 1.5A, integrated FETs; current-mode control; fixed 0.8V FB; no EXTVCC pin or programmable PFM. | No built-in RESET; no soft-start capacitor option (fixed internal SS); lacks thermal hysteresis and prebias startup. | Choose TPS54160AIDR if higher output current (1.5A) is required and RESET/soft-start flexibility is not critical. |
Compared with LM5164QPWPRQ1 and TPS54160AIDR, the MAX17761ATC+ uniquely combines 76V input capability, dual-mode (PWM/PFM) operation, EXTVCC switchover for efficiency optimization, and integrated RESET with programmable thresholds - making it optimal for industrial and telecom systems demanding wide VIN, high reliability, and flexible power sequencing.
Availability
The MAX17761ATC+ is available at Aetrix Electronics and suitable for industrial control power supplies, distributed supply regulation, and basestation power supplies requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX17761ATC+ 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, automotive, and communications applications.
The MAX17761ATC+ belongs to Maxim's high-voltage DC-DC converter product line, engineered specifically for rugged industrial and telecom power systems needing wide-input, high-efficiency, and feature-rich regulation without external complexity.
FAQ
What is the maximum input voltage rating for the MAX17761ATC+?
The MAX17761ATC+ has an absolute maximum input voltage rating of +80V, with guaranteed continuous operation from 4.5V to 76V. This 76V operational upper limit enables direct compatibility with 48V industrial buses, telecom -48V systems (with proper polarity), and transient-tolerant designs where load-dump events may exceed nominal rail voltages. Operation beyond 76V is not specified and risks damage or parametric failure.
Does the MAX17761ATC+ support prebiased output startup?
Yes, the MAX17761ATC+ supports monotonic startup into prebiased outputs. During power-up, both high-side and low-side MOSFETs remain off until the PWM comparator commands the first pulse, preventing reverse current flow from the precharged output. This behavior is inherent to the control architecture and requires no external configuration - ensuring safe operation when the device is powered in systems with shared or back-fed rails.
How is the switching frequency programmed on the MAX17761ATC+?
The switching frequency of the MAX17761ATC+ is programmed using a resistor from the RT/SYNC pin to SGND, selecting discrete frequencies of 200kHz, 300kHz, 400kHz, or 600kHz. Alternatively, an external clock signal between 1.15× and 1.4× the programmed fSW can be applied to RT/SYNC for synchronization - useful in multi-converter systems to avoid beat frequencies and reduce EMI peaks.
What is the function of the EXTVCC pin on the MAX17761ATC+?
The EXTVCC pin on the MAX17761ATC+ provides an auxiliary input to power the internal 5V VCC LDO. When EXTVCC exceeds ~4.74V, the device automatically switches VCC sourcing from VIN to EXTVCC - reducing power dissipation and improving efficiency, especially at high input voltages (e.g., 48V or 72V). This switchover is seamless and includes hysteresis to prevent oscillation near the threshold.
Can the MAX17761ATC+ operate in both PWM and PFM modes simultaneously?
No, the MAX17761ATC+ cannot operate in both PWM and PFM modes simultaneously. The mode is selected at power-up via the resistor value on the MODE/ILIM pin and remains fixed until the next power cycle. PWM mode enables constant-frequency operation and negative inductor current for improved light-load regulation, while PFM mode skips pulses to achieve higher efficiency at very light loads - the choice depends on the application's EMI and efficiency priorities.
MAX17761ATC+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WFDFN 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):
- 76V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 68.4V
- Current - Output:
- 1A
- Frequency - Switching:
- 200kHz ~ 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TDFN (3x3)
MAX17761ATC+ FAQ
1.How can I place an order for MAX17761ATC+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17761ATC+ 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 MAX17761ATC+ reliable?
The price and inventory of MAX17761ATC+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17761ATC+ is usually 5 days.
3.What payment methods are accepted for MAX17761ATC+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17761ATC+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17761ATC+?
MAX17761ATC+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17761ATC+ 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 MAX17761ATC+?
For technical support, including MAX17761ATC+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17761ATC+ requirements.
6.How does Aetrix verify that MAX17761ATC+ is sourced from the original manufacturer or authorized distributors?
All MAX17761ATC+ 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 MAX17761ATC+ meets industry standards.
7.What is the process for return or replacement of MAX17761ATC+?
All MAX17761ATC+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17761ATC+, 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 MAX17761ATC+ part is unused and in its original packaging.
Return procedure for MAX17761ATC+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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