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Analog Devices Inc./Maxim Integrated MAX17645DATA+
- Part No.:
- MAX17645DATA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WFDFN
- Datasheet:
-
MAX17645DATA+.pdf
- Description:
- IC REG BUCK ADJ 1A 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,677
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Product details
Overview
MAX17645DATA+ from Analog Devices is a 4.5V to 36V input, 1A synchronous step-down DC-DC converter with integrated high-side pMOS and low-side nMOS FETs, internal loop compensation, and PFM light-load operation. It delivers up to 1A at adjustable output voltages from 0.9V to 89% of VIN, achieves 90% full-load efficiency at 24VIN/5VOUT, and operates across –40°C to +125°C ambient for industrial power rails.
For engineers reviewing the MAX17645DATA+ datasheet, MAX17645DATA+ pinout, MAX17645DATA+ application, or MAX17645DATA+ equivalent, key selection criteria include its PFM-mode quiescent current (115–170µA), 650kHz fixed switching frequency, 0.915V feedback regulation voltage, hiccup-mode overload protection, and TDFN-8 (2mm × 2mm) package compatibility with compact point-of-load designs.
Technical Context
The MAX17645DATA+ implements peak-current-mode control with slope compensation and operates exclusively in PFM mode at light loads-disabling negative inductor current and entering hibernate cycles to achieve high light-load efficiency. Its internal LDO generates a regulated 5V VCC rail from VIN, enabling self-powered gate drive and internal circuitry without external bias.
It features monotonic startup into prebiased outputs, programmable EN/UVLO thresholds (1.215V rising, 1.09V falling), open-drain RESET monitoring (95.5% rising / 92% falling thresholds), and robust protection including cycle-by-cycle peak current limit (1.88A typ), runaway current limit (2.44A typ), thermal shutdown (166°C), and CISPR32 Class B compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports wide industrial and automotive supply rails without external pre-regulation. |
| Output Current | Up to 1A - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Switching Frequency | 650kHz (typ) - enables use of small 6.8µH–10µH inductors and compact ceramic capacitors. |
| Feedback Voltage | 0.915V (typ) - sets precise output regulation with ±1.1% accuracy over –40°C to +125°C. |
| Light-Load Quiescent Current | 115–170µA - minimizes standby power in battery-backed or energy-sensitive applications. |
| Shutdown Current | 2.2µA (typ) - enables ultra-low-power system sleep states with true shutdown via EN/UVLO. |
| Efficiency @ 24VIN/5VOUT/1A | 90% (typ) - reduces thermal load and simplifies heatsinking in enclosed industrial enclosures. |
| Operating Temperature | –40°C to +125°C ambient - qualified for factory automation, transportation, and harsh-environment deployments. |
Pinout & Package
Package: 8-pin TDFN (2mm × 2mm, 0.5mm pitch), RoHS-compliant, with exposed thermal pad for enhanced power dissipation (θJA = 72°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Power Input | Primary HV input rail connection; requires local 2.2µF ceramic decoupling to PGND for EMI suppression and transient response. |
| 2 EN/UVLO | Enable & UVLO Control | Programmable enable threshold (1.215V rise); drives device into true shutdown (<2.2µA IIN) when pulled below 0.75V. |
| 3 VCC | LDO Output | Internally generated 5V supply (±5%); powers gate drivers and logic; bypassed with 1µF ceramic to SGND. |
| 4 FB | Voltage Feedback | High-impedance input sensing output divider; regulates VOUT to 0.915V reference with ±1.1% accuracy over temperature. |
| 5 RESET | Open-Drain Status | Asserts low when VOUT drops below 92% of setpoint; releases high-impedance 1.6ms after VOUT exceeds 95.5% - provides reliable power-good signaling. |
| 6 SGND | Signal Ground | Analog reference return for FB, EN/UVLO, RESET; must be star-connected to PGND at output capacitor to avoid noise coupling. |
| 7 PGND | Power Ground | High-current return path for LX and input/output capacitors; connects directly to power plane to minimize ground bounce and EMI. |
| 8 LX | Switch Node | Drives external inductor; high-impedance during shutdown; requires tight layout to minimize parasitic inductance and ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous FETs | Eliminates need for external Schottky diode and reduces conduction losses - enables >90% full-load efficiency without discrete MOSFETs. |
| Internal Loop Compensation | Removes requirement for external compensation network - simplifies design, reduces BOM count, and ensures stable operation across full output voltage range (0.9V–89% VIN). |
| PFM Light-Load Operation | Reduces quiescent current to 115–170µA and improves light-load efficiency - critical for always-on industrial sensors and asset trackers with intermittent activity. |
| Monotonic Startup into Prebiased Outputs | Prevents output capacitor discharge during hot-swap or multi-rail sequencing - protects downstream logic and avoids system reset glitches. |
| Hiccup-Mode Overcurrent Protection | Triggers 100ms suspension after single runaway event (2.44A) - limits power dissipation during short-circuit faults while enabling automatic recovery. |
| CISPR32 Class B Compliance | Meets radiated emission limits for commercial/industrial equipment without additional filtering - accelerates EMC certification for end products. |
Applications
| Factory Automation Power Rail | Automotive Asset Tracker |
|---|---|
Use Scenario: Powering PLC I/O modules, motor drivers, and vision sensors in sealed control cabinets where heat buildup must be minimized. IC Role / Device Role / Timing Role: Primary 5V/1A point-of-load regulator converting 24V DC bus to logic-level rails with high efficiency and thermal resilience. Use Value: Delivers 90% efficiency at full load and dissipates <1110mW max, reducing cabinet cooling requirements and extending component lifetime in +70°C ambient environments. | Use Scenario: Compact GPS/Cellular telematics units mounted in vehicle engine bays or under-dash locations with wide temperature and input voltage variation. IC Role / Device Role / Timing Role: High-voltage buck converter generating stable 3.3V/1A from 7–36V automotive battery supply with PFM-mode battery preservation. Use Value: Achieves 115–170µA quiescent current in PFM mode and operates reliably from –40°C to +125°C ambient - extends battery life and ensures cold-start functionality. |
| Industrial IoT Sensor Node | Ruggedized HMI Display Supply |
Use Scenario: Battery- or energy-harvest powered environmental sensor nodes requiring long-term operation with minimal maintenance. IC Role / Device Role / Timing Role: Efficient step-down regulator delivering 1.8V or 3.3V to ultra-low-power MCUs and RF transceivers with programmable UVLO for brownout prevention. Use Value: 2.2µA shutdown current and monotonic prebias startup enable rapid wake-from-sleep transitions and prevent data loss during supply interruptions. | Use Scenario: Operator interface panels in manufacturing cells exposed to dust, vibration, and thermal cycling, requiring robust, maintenance-free power conversion. IC Role / Device Role / Timing Role: Main 5V/1A supply for display controllers and touch controllers, featuring RESET monitoring and thermal shutdown for fault-safe operation. Use Value: Open-drain RESET signal (95.5%/92% thresholds) and 166°C thermal shutdown with 10°C hysteresis provide deterministic fault reporting and graceful degradation under overload conditions. |
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 |
|---|---|---|---|
| LM61480RQWR | 4.5V–36V input, 8A output, 2.1MHz switching, no PFM mode - higher current, higher frequency, PWM-only operation. | Targets high-power applications (e.g., servo drives); unsuitable for ultra-low-IQ or prebias startup requirements. | Select LM61480RQWR only when >1A output or faster transient response is required; not drop-in compatible due to different pinout and control architecture. |
| TPS54202HDDCR | 4.5V–28V input, 2A output, 600kHz, PFM/PWM auto-mode, 45µA IQ - lower IQ but narrower VIN range and no true shutdown. | Better for cost-sensitive consumer electronics; lacks CISPR32 Class B compliance and -40°C to +125°C qualification. | Choose TPS54202HDDCR for lower-quiescent, non-industrial applications; verify thermal performance and EMC compliance separately. |
Compared with LM61480RQWR and TPS54202HDDCR, the MAX17645DATA+ uniquely balances 1A capability, PFM-mode ultra-low IQ, full industrial temperature range, and integrated protection - making it optimal for space-constrained, thermally demanding, and always-on industrial edge devices where reliability and regulatory compliance are mandatory.
Availability
MAX17645DATA+ is available at Aetrix Electronics and suitable for factory automation controllers, automotive telematics units, industrial IoT sensor nodes, and ruggedized HMI displays requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX17645DATA+ 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, sensing, and signal chain solutions.
The MAX17645DATA+ belongs to Analog Devices' high-voltage synchronous buck converter product line, designed specifically for robust, compact, and efficient point-of-load regulation in harsh industrial and transportation environments.
FAQ
What is the primary operating mode of the MAX17645DATA+?
The MAX17645DATA+ operates exclusively in pulse-frequency modulation (PFM) mode at light loads to maximize efficiency and minimize quiescent current. Unlike the MAX17645B variant, it disables negative inductor current and enters hibernate cycles during low-load conditions - achieving 115–170µA typical quiescent current and improving battery life in always-on applications.
Does the MAX17645DATA+ require external compensation components?
No, the MAX17645DATA+ integrates full control-loop compensation internally across its entire output voltage range (0.9V to 89% of VIN). This eliminates the need for external Type-II or Type-III compensation networks, reduces component count, saves PCB area, and guarantees stability without design iteration - a key advantage over controllers requiring external compensation.
What is the function of the RESET pin on the MAX17645DATA+?
The RESET pin on the MAX17645DATA+ is an open-drain output that signals power-good status: it goes high-impedance 1.6ms after the output voltage rises above 95.5% of its nominal setpoint, and pulls low when the output falls below 92% of setpoint. It also asserts low during hiccup-mode timeout and thermal shutdown - providing deterministic system-level fault detection and sequencing control.
Can the MAX17645DATA+ start up into a prebiased output?
Yes, the MAX17645DATA+ supports monotonic startup into prebiased outputs without discharging the output capacitor - a critical feature for multi-rail systems and hot-swap applications. This behavior is maintained in both PFM and forced-PWM modes, ensuring safe power sequencing for FPGAs, processors, and mixed-voltage SoCs without risk of back-driving or latch-up.
What protection features are built into the MAX17645DATA+?
The MAX17645DATA+ includes cycle-by-cycle peak current limiting (1.88A typ), runaway current limiting (2.44A typ), hiccup-mode overload protection (100ms timeout), thermal shutdown (166°C with 10°C hysteresis), and output undervoltage monitoring via RESET. These protections operate autonomously without external components - ensuring robust operation under short-circuit, overtemperature, and overvoltage fault conditions in unattended industrial deployments.
MAX17645DATA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN
- Packaging:
- Strip
- 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):
- 36V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 32.04V
- Current - Output:
- 1A
- Frequency - Switching:
- 650kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (2x2)
MAX17645DATA+ FAQ
1.How can I place an order for MAX17645DATA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17645DATA+ 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 MAX17645DATA+ reliable?
The price and inventory of MAX17645DATA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17645DATA+ is usually 5 days.
3.What payment methods are accepted for MAX17645DATA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17645DATA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17645DATA+?
MAX17645DATA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17645DATA+ 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 MAX17645DATA+?
For technical support, including MAX17645DATA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17645DATA+ requirements.
6.How does Aetrix verify that MAX17645DATA+ is sourced from the original manufacturer or authorized distributors?
All MAX17645DATA+ 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 MAX17645DATA+ meets industry standards.
7.What is the process for return or replacement of MAX17645DATA+?
All MAX17645DATA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17645DATA+, 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 MAX17645DATA+ part is unused and in its original packaging.
Return procedure for MAX17645DATA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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