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Analog Devices Inc./Maxim Integrated MAX17640BATA+
- Part No.:
- MAX17640BATA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WFDFN
- Datasheet:
-
MAX17640BATA+.pdf
- Description:
- IC REG BUCK 5V 400MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,375
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Product details
Overview
MAX17640BATA+ from Analog Devices is a high-efficiency, synchronous step-down DC-DC converter with integrated MOSFETs, delivering 5.0V at up to 400mA from a 4.5V–60V input. It features peak-current-mode control, MODE-selectable PWM/PFM operation, and an internal 5V LDO for gate drive. Used in industrial sensors and 4–20mA loop power supplies where compact size and wide VIN range are critical.
For engineers reviewing the MAX17640BATA+ datasheet, MAX17640BATA+ pinout, MAX17640BATA+ application, or MAX17640BATA+ equivalent, this page provides verified technical context, validated pin functions, confirmed 8-pin TDFN (2mm × 2mm) package mapping, real-world efficiency data (92% peak), and two rigorously cross-checked alternative parts for fixed 5V buck conversion.
Technical Context
The MAX17640BATA+ employs a fixed-frequency, internally compensated peak-current-mode architecture with cycle-by-cycle overcurrent protection and hiccup-mode recovery. Its MODE pin latches at power-up to select between forced-PWM (constant 500kHz switching) or PFM (pulse-skipping, no negative inductor current).
It integrates a high-side pMOS (1.75Ω typical RDS(on) at +25°C) and low-side nMOS (0.6Ω typical), an internal 5V LDO (4.75–5.25V output, 30mA limit), and open-drain RESET monitoring output with 92–97.5% VOUT threshold hysteresis and 2ms delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports direct connection to 24V/48V industrial rails and battery stacks without pre-regulation. |
| Output Voltage | Fixed 5.0V ±1.4% - internally trimmed; no external feedback resistors required for nominal operation. |
| Max Output Current | 400mA - sustained delivery under full load with thermal shutdown protection at +166°C junction. |
| Peak Efficiency | 92% - achieved at mid-load with all-ceramic capacitor design and low RDS(on) integrated FETs. |
| Switching Frequency | 500kHz ±7% - enables compact magnetics (e.g., 68µH inductor) and predictable EMI filtering. |
| Shutdown Current | 2.2µA typical - ensures minimal battery drain in always-connected industrial sensor nodes. |
| Operating Temp | −40°C to +125°C ambient - qualified for HVAC controllers and outdoor building automation equipment. |
Pinout & Package
MAX17640BATA+ is housed in an 8-pin, 2mm × 2mm TDFN package (package code T822CN+1) with exposed pad for thermal dissipation. The pinout is validated per Maxim Integrated's official datasheet (Rev 1, 7/23) and schematic symbol.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input | Primary input rail connection; requires local 1µF X7R ceramic bypass to GND for stability. |
| EN/UVLO (Pin 2) | Enable / Input UVLO Input | Active-high logic; rising threshold 1.215V enables startup; resistor divider sets custom turn-on voltage. |
| VCC (Pin 3) | Internal LDO Output | Supplies 5V gate drive and internal circuitry; must be bypassed with ≥1µF ceramic to GND. |
| FB/VOUT (Pin 4) | Feedback / Output Sense | Direct connection to 5V output for fixed-voltage regulation; no external divider needed. |
| MODE (Pin 5) | Control Mode Selection | GND = forced-PWM; floating = automatic PFM at light loads; latched at power-up only. |
| RESET (Pin 6) | Open-Drain Fault Monitor | Pulls low when VOUT drops below 92% of 5V; high-impedance after 2ms delay when VOUT > 95%. |
| GND (Pin 7) | Power Ground | Primary return path; must connect to solid ground plane and tie all system grounds at single point. |
| LX (Pin 8) | Switch Node | Connects to inductor switch node; high-impedance during shutdown; drives external 68µH inductor. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode; reduces conduction loss and PCB area in 5V PoL designs. |
| Internal compensation | Removes need for external compensation network-simplifies layout and accelerates design validation. |
| Monotonic startup into prebiased output | Prevents output capacitor discharge during hot-swap or multi-rail sequencing in PLC I/O modules. |
| Programmable EN/UVLO threshold | Enables precise brown-in/brown-out control using resistor divider-critical for battery-powered sensors. |
| CISPR32 Class B compliance | Meets conducted and radiated emissions limits without added shielding-reduces system-level EMC effort. |
Applications
| Industrial Sensor Power | 4–20mA Loop Supply |
|---|---|
|
Use Scenario: Powering analog sensor front-ends (e.g., pressure transmitters) in hazardous-area field devices with 24V loop supply. IC Role / Device Role / Timing Role: Primary 5V step-down regulator converting loop voltage to stable sensor rail; operates across full 12–36V loop range. Use Value: Enables ultra-compact sensor PCBs (< 100mm² footprint) while maintaining >90% efficiency at 100mA load typical for 4–20mA transmitters. |
Use Scenario: Providing isolated 5V bias for loop-powered smart transmitters with HART modulation capability. IC Role / Device Role / Timing Role: Local 5V PoL regulator downstream of loop isolator; delivers clean, low-noise supply for ADC and microcontroller. Use Value: Internal soft-start prevents inrush-induced HART signal corruption; RESET pin monitors rail integrity during communication bursts. |
| HVAC Zone Controller | High-Voltage LDO Replacement |
|
Use Scenario: Generating 5V for microcontroller, display, and relay drivers in wall-mounted thermostats powered from 24VAC/DC HVAC systems. IC Role / Device Role / Timing Role: Main system regulator handling wide-input transients (e.g., transformer inrush, rectifier ripple) and -40°C cold starts. Use Value: −40°C to +125°C rating ensures reliable startup in unheated attics; hiccup-mode OCP prevents latch-up during relay coil back-EMF events. |
Use Scenario: Replacing inefficient 60V-input linear regulators in legacy industrial instrumentation with >1W dissipation. IC Role / Device Role / Timing Role: High-efficiency drop-in replacement for obsolete 78L05-based solutions; maintains same 5V output but cuts thermal load by >80%. Use Value: Reduces heatsink requirement from 25°C/W to passive PCB copper; enables sealed enclosure designs without forced air cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDDARQ1 | 4.5–65V input, 5V fixed, 300mA max; requires external compensation and feedback divider; AEC-Q100 automotive grade. | Better suited for automotive body electronics; lacks internal VCC LDO and RESET monitor. | Choose LM5164QDDARQ1 only if AEC-Q100 qualification is mandatory and 100mA lower output current is acceptable. |
| TPS54340DDAR | 3.5–42V input, adjustable output only; 3.5A max; external FETs required; no integrated LDO or RESET. | Designed for higher-current industrial SMPS; needs additional components for 5V fixed output and fault monitoring. | Choose TPS54340DDAR only when >400mA load or wider duty-cycle margin is required; adds BOM cost and layout complexity. |
Compared with LM5164QDDARQ1 and TPS54340DDAR, MAX17640BATA+ offers the smallest solution size (2mm × 2mm), lowest component count (no FB divider, no external LDO), and built-in system-level monitoring (RESET), making it optimal for space-constrained, cost-sensitive industrial PoL applications requiring 5V/400mA.
Availability
MAX17640BATA+ is available at Aetrix Electronics and suitable for industrial sensors, 4–20mA current loops, and HVAC controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX17640BATA+ 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 power management semiconductors, serving industrial, automotive, and communications markets with precision and reliability.
The MAX17640 family belongs to Analog Devices' Himalaya power portfolio, designed specifically for compact, high-efficiency DC-DC conversion in harsh industrial environments where wide input range and robust protection are essential.
FAQ
What is the exact output voltage tolerance of the MAX17640BATA+ under full load?
The MAX17640BATA+ delivers a fixed 5.0V output with ±1.4% regulation tolerance (4.93V to 5.07V) across temperature and line conditions at full 400mA load, as specified in the Electrical Characteristics table under "VOUT Regulation Voltage" with MODE = GND.
Can the MAX17640BATA+ operate safely at 60V input continuously?
Yes, the MAX17640BATA+ supports continuous operation at 60V input, as confirmed by its Absolute Maximum Rating (VIN to GND = −0.3V to 70V) and Electrical Characteristics (Input Voltage Range = 4.5V to 60V). Thermal derating must be observed above +70°C ambient per θJA = 162°C/W.
Does the MAX17640BATA+ require external feedback resistors to set the 5V output?
No, the MAX17640BATA+ has an internal feedback divider optimized for 5.0V output. Pin FB/VOUT (Pin 4) connects directly to the output node-no external resistors are needed, reducing BOM count and layout area versus adjustable buck converters.
How does the RESET pin on the MAX17640BATA+ behave during startup and fault conditions?
The RESET pin on the MAX17640BATA+ remains high-impedance until VOUT reaches 95% of 5V, then asserts low if VOUT falls below 92% of 5V. During hiccup-mode overcurrent, RESET stays low throughout the 131ms timeout period, providing clear system-level fault indication.
Is the MAX17640BATA+ pin-compatible with other variants in the MAX17640 family?
Yes, all MAX17640 variants-including MAX17640AATA+, MAX17640BATA+, and MAX17640CATA+-share identical 8-pin TDFN (2mm × 2mm) packaging and pinout. Only FB/VOUT behavior differs: fixed 3.3V, fixed 5V, or adjustable via external divider.
MAX17640BATA+ 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):
- 5V
- 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)
MAX17640BATA+ FAQ
1.How can I place an order for MAX17640BATA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17640BATA+ 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 MAX17640BATA+ reliable?
The price and inventory of MAX17640BATA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17640BATA+ is usually 5 days.
3.What payment methods are accepted for MAX17640BATA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17640BATA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17640BATA+?
MAX17640BATA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17640BATA+ 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 MAX17640BATA+?
For technical support, including MAX17640BATA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17640BATA+ requirements.
6.How does Aetrix verify that MAX17640BATA+ is sourced from the original manufacturer or authorized distributors?
All MAX17640BATA+ 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 MAX17640BATA+ meets industry standards.
7.What is the process for return or replacement of MAX17640BATA+?
All MAX17640BATA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17640BATA+, 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 MAX17640BATA+ part is unused and in its original packaging.
Return procedure for MAX17640BATA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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