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Analog Devices Inc./Maxim Integrated MAX17640AATA+
- Part No.:
- MAX17640AATA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WFDFN
- Datasheet:
-
MAX17640AATA+.pdf
- Description:
- IC REG BUCK 3.3V 400MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,593
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Product details
Overview
MAX17640AATA+ from Analog Devices is a Himalaya-series synchronous step-down DC-DC converter with integrated high-side pMOS and low-side nMOS FETs, delivering up to 400mA at a fixed 3.3V output from a 4.5V–60V input. It employs peak-current-mode control, supports PWM/PFM mode selection via the MODE pin, and features internal soft-start, EN/UVLO threshold programming, and open-drain RESET for output monitoring. It is used in industrial sensors and 4–20mA current loops where compact, high-efficiency, wide-input regulation is required.
For engineers reviewing the MAX17640AATA+ datasheet, MAX17640AATA+ pinout, MAX17640AATA+ application, or MAX17640AATA+ equivalent, this page provides verified technical context, confirmed pin functions, real-world application mappings, and validated alternative parts - all grounded in the official Analog Devices MAX17640 family datasheet (Rev 1, 7/23).
Technical Context
The MAX17640AATA+ implements a fixed-frequency, internally compensated peak-current-mode control architecture with cycle-by-cycle overcurrent protection and hiccup-mode recovery. Its MODE pin latches at power-up to select either forced-PWM (constant 500kHz switching) or PFM (pulse-skipping, no negative inductor current), directly impacting light-load efficiency and EMI behavior.
It integrates a 5V internal LDO (VCC) with 150mV dropout, monitors output voltage via FB/VOUT with ±1.5% regulation accuracy at 3.3V, and asserts RESET when VOUT falls below 92% of nominal. Startup into prebiased outputs is supported monotonically without discharging the output capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports direct connection to unregulated industrial rails, battery stacks, or PoE-derived supplies without external pre-regulation. |
| Output Voltage | Fixed 3.3V ±1.5% - tightly regulated for powering microcontrollers, ADCs, and digital I/O in noise-sensitive systems. |
| Max Output Current | 400mA - sufficient for point-of-load regulation in sensor nodes, PLC I/O modules, and HVAC controllers. |
| Peak Efficiency | 92% - achieved using synchronous rectification and low RDS(on) MOSFETs (1.75Ω high-side, 0.6Ω low-side at +25°C), reducing thermal load and PCB area. |
| Switching Frequency | 500kHz (typ) - enables use of small 68µH inductors and ceramic capacitors, supporting ultra-compact 2mm × 2mm TDFN layouts. |
| Shutdown Current | 2.2µA (typ) - allows long-term battery-backed operation in always-on industrial monitoring devices. |
| Operating Temp Range | −40°C to +125°C ambient - qualified for deployment in harsh environments including factory floors and outdoor building controls. |
Pinout & Package
MAX17640AATA+ is housed in an 8-pin, 2mm × 2mm TDFN package (package code T822CN+1) with exposed thermal pad for enhanced heat dissipation in high-ambient applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Accepts 4.5V–60V supply; requires local 1µF X7R ceramic bypass to GND for stability and EMI suppression. |
| EN/UVLO (Pin 2) | Enable / input UVLO input | Active-high logic; rising threshold 1.215V (typ); resistor divider from VIN enables programmable turn-on voltage. |
| VCC (Pin 3) | Internal 5V LDO output | Powers internal circuitry and gate drivers; must be bypassed with ≥1µF ceramic capacitor to GND. |
| FB/VOUT (Pin 4) | Feedback / output sense | Connected directly to 3.3V output for fixed-voltage regulation; internal reference is 0.9V (±1.5%). |
| MODE (Pin 5) | PFM/PWM mode select | GND = forced-PWM (fixed 500kHz); floating = PFM (pulse-skipping, higher light-load efficiency). |
| RESET (Pin 6) | Open-drain reset output | Pulls low when VOUT < 92% of 3.3V; high-impedance 2ms after VOUT > 95% - enables system brown-out detection. |
| GND (Pin 7) | Power ground | Primary return path; must connect to solid ground plane and tie all grounds at single point per layout guidelines. |
| LX (Pin 8) | Switch node | Connects to inductor switch node; high-impedance during shutdown; carries high di/dt - requires short, low-inductance trace. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, reduces conduction loss, and improves full-load efficiency by ~8% vs. asynchronous designs. |
| Internal compensation & feedback divider | Removes need for external compensation network and output voltage-setting resistors - simplifies BOM and layout for 3.3V output. |
| Programmable EN/UVLO threshold | Allows precise input voltage turn-on/off control using a two-resistor divider - critical for battery-powered or multi-rail sequencing systems. |
| Monotonic startup into prebiased output | Prevents reverse current flow and output capacitor discharge during hot-swap or rail-sequencing events - protects downstream logic. |
| Hiccup-mode overcurrent protection | Disables switching and retries after timeout on sustained overload - prevents thermal runaway while maintaining system observability. |
| CISPR32 Class B compliance | Meets conducted and radiated EMI limits without external filtering - reduces design validation time in industrial EMC testing. |
Applications
| Industrial Sensors | 4–20mA Current Loops |
|---|---|
Use Scenario: Powering analog sensor front-ends (e.g., pressure, temperature transmitters) mounted in explosion-proof enclosures with limited board space and wide input voltage variation. IC Role / Device Role / Timing Role: Primary 3.3V point-of-load regulator converting raw 12–48V loop supply to stable MCU and signal-chain rail. Use Value: 92% peak efficiency and 2.2µA shutdown current extend battery life in wireless sensor nodes; -40°C to +125°C rating ensures reliability in outdoor installations. |
Use Scenario: Providing isolated 3.3V bias for loop-powered transmitter ICs (e.g., XTR115/116) in process automation systems. IC Role / Device Role / Timing Role: Local regulation stage downstream of loop supply, decoupling sensitive analog circuitry from noisy 4–20mA line transients. Use Value: Internal soft-start prevents inrush-induced loop current spikes; RESET output enables diagnostics of supply brownout conditions affecting loop integrity. |
| HVAC and Building Control | High-Voltage LDO Replacement |
Use Scenario: Powering microcontroller-based thermostats, damper actuators, and occupancy sensors powered from 24VAC/DC HVAC distribution buses. IC Role / Device Role / Timing Role: Efficient step-down regulator replacing inefficient linear regulators in space-constrained wall-mounted units. Use Value: 2mm × 2mm TDFN footprint saves >60% board area vs. SOT-23 LDOs; PFM mode maintains >85% efficiency at 10mA standby loads. |
Use Scenario: Replacing 60V-rated linear regulators (e.g., LT1129, TPS7A47) in legacy industrial equipment where heat dissipation and efficiency are limiting factors. IC Role / Device Role / Timing Role: High-input, low-dropout switching alternative delivering same 3.3V output with 10× lower thermal load. Use Value: Eliminates heatsinks and airflow requirements; 92% efficiency reduces junction temperature rise by >40°C at 300mA load vs. linear solution. |
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 |
|---|---|---|---|
| LM5164QDRCRQ1 | Automotive-grade (AEC-Q100), 65V max input, 3.3V adjustable via external resistors; no internal feedback divider; requires external compensation. | Better suited for automotive body electronics requiring qualification; lacks integrated 3.3V feedback, increasing BOM count and layout complexity. | Choose LM5164QDRCRQ1 only if AEC-Q100 compliance is mandatory and design can accommodate external feedback components. |
| TPS564201 | Lower input range (4.5V–17V), 3.3V fixed output, 4A capability; uses external MOSFETs; larger SOIC-8 package (4.9mm × 6mm). | Targeted at higher-current, lower-input applications (e.g., 12V server rails); not viable for 48V industrial inputs due to voltage limit. | Choose TPS564201 only for cost-sensitive, high-current 12V systems where board space is not constrained and input voltage never exceeds 17V. |
Compared with LM5164QDRCRQ1 and TPS564201, MAX17640AATA+ uniquely combines 60V input capability, fixed 3.3V output with internal feedback, ultra-small 2mm × 2mm footprint, and industrial temperature rating - making it optimal for space-limited, wide-input industrial point-of-load applications without automotive or high-current requirements.
Availability
MAX17640AATA+ is available at Aetrix Electronics and suitable for industrial sensors, 4–20mA current loops, and HVAC control systems requiring stable component supply across extended product lifecycles.
Supply support for MAX17640AATA+ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The MAX17640 family belongs to Analog Devices' Himalaya power portfolio, designed specifically for compact, high-efficiency, wide-input DC-DC conversion in harsh industrial environments - emphasizing reliability, minimal external components, and ease of integration.
FAQ
What is the output voltage tolerance of the MAX17640AATA+ under full load and temperature range?
The MAX17640AATA+ delivers a fixed 3.3V output with ±1.5% regulation accuracy over the full −40°C to +125°C ambient temperature range and 0–400mA load. This is guaranteed by internal trimming of the 0.9V feedback reference and verified across all operating conditions in the datasheet's Electrical Characteristics table.
Does the MAX17640AATA+ require external compensation components?
No, the MAX17640AATA+ features fully internal compensation. Its peak-current-mode control architecture eliminates the need for external RC networks or type-II/type-III compensators - a key enabler of its ultra-compact 2mm × 2mm TDFN implementation and simplified design-in process.
How does the MODE pin affect efficiency and EMI performance in the MAX17640AATA+?
When MODE is grounded, MAX17640AATA+ operates in forced-PWM mode (500kHz fixed frequency), ensuring predictable EMI spectra but lowering light-load efficiency. When MODE is left floating, it enters PFM mode - skipping pulses at light loads to achieve >85% efficiency at 10mA while spreading EMI energy across frequencies.
Can the MAX17640AATA+ safely start up into a precharged output capacitor?
Yes, the MAX17640AATA+ supports monotonic startup into a prebiased output without reverse current or output discharge. This is explicitly verified in the datasheet's "Startup into a Prebiased Output" section and is essential for hot-swap and multi-rail sequencing applications where downstream capacitors may retain charge.
What is the function of the RESET pin on the MAX17640AATA+, and how is it configured?
The RESET pin on MAX17640AATA+ is an open-drain output that pulls low when the regulated 3.3V output drops below 92% (3.036V) and goes high-impedance 2ms after the output rises above 95% (3.135V). It requires an external pull-up resistor to a compatible voltage rail (e.g., 3.3V or 5V) and is used for system-level power-good monitoring and fault reporting.
MAX17640AATA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Himalaya
- Package/Case:
- 8-WFDFN
- Packaging:
- Strip
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 400mA
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (2x2)
MAX17640AATA+ FAQ
1.How can I place an order for MAX17640AATA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17640AATA+ 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 MAX17640AATA+ reliable?
The price and inventory of MAX17640AATA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17640AATA+ is usually 5 days.
3.What payment methods are accepted for MAX17640AATA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17640AATA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17640AATA+?
MAX17640AATA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17640AATA+ 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 MAX17640AATA+?
For technical support, including MAX17640AATA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17640AATA+ requirements.
6.How does Aetrix verify that MAX17640AATA+ is sourced from the original manufacturer or authorized distributors?
All MAX17640AATA+ 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 MAX17640AATA+ meets industry standards.
7.What is the process for return or replacement of MAX17640AATA+?
All MAX17640AATA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17640AATA+, 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 MAX17640AATA+ part is unused and in its original packaging.
Return procedure for MAX17640AATA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX17640AATA+ Tags
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