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Analog Devices Inc./Maxim Integrated MAX17640CATA+T
- Part No.:
- MAX17640CATA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WFDFN
- Datasheet:
-
MAX17640CATA+T.pdf
- Description:
- IC REG BUCK ADJ 400MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,456
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Product details
Overview
MAX17640CATA+T from Analog Devices is an adjustable-output, high-voltage synchronous step-down DC-DC converter with integrated MOSFETs, operating from 4.5V to 60V input and delivering up to 400mA at output voltages from 0.9V to 0.89 × VIN. It features peak-current-mode control, MODE-pin-selectable PFM/PWM operation, internal soft-start, and a 2mm × 2mm 8-pin TDFN package. It is designed for industrial point-of-load regulation in space-constrained, high-reliability systems.
For engineers reviewing the MAX17640CATA+T datasheet, MAX17640CATA+T pinout, MAX17640CATA+T application, or MAX17640CATA+T equivalent, key selection criteria include its 400mA load capability, 0.9V–0.89×VIN adjustable output, 500kHz switching frequency, -40°C to +125°C ambient rating, and integrated 5V LDO for gate drive - all in an ultra-small TDFN package requiring only ceramic capacitors.
Technical Context
The MAX17640CATA+T implements a fixed-frequency, internally compensated peak-current-mode control architecture with cycle-by-cycle current limiting and hiccup-mode overcurrent protection. Its MODE pin latches at power-up to select between constant-frequency PWM (MODE = GND) or light-load-optimized PFM (MODE unconnected), directly affecting inductor current behavior and efficiency profile.
It integrates a high-side pMOSFET (RDS(on) = 1.75Ω typ at +25°C) and low-side nMOSFET (RDS(on) = 0.6Ω typ), an internal 5V LDO (VCC) with 4.75V–5.25V output and 150mV dropout, and a precision feedback reference (0.9V ±1.3% at FB/VOUT). The RESET pin provides open-drain output monitoring with 92% undervoltage trip and 2ms delay after regulation recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports wide industrial supply rails including 24V, 36V, and 48V systems without external pre-regulation. |
| Output Voltage Range | 0.9V to 0.89 × VIN - enables flexible rail generation (e.g., 1.8V, 3.3V, 5V, 12V, 15V) using external resistor divider on FB/VOUT. |
| Max Output Current | 400mA - sufficient for powering microcontrollers, sensors, ADCs, and interface ICs in distributed power architectures. |
| Switching Frequency | 500kHz ±7% - balances EMI performance, inductor size, and efficiency; fixed in PWM mode, variable in PFM mode. |
| Peak Efficiency | 92% - achieved at mid-load with ceramic input/output capacitors and optimized layout; enabled by synchronous rectification and low RDS(on). |
| Shutdown Current | 2.2µA typical - minimizes system standby power loss; enabled via EN/UVLO pin pulled low. |
| Operating Temp Range | -40°C to +125°C ambient - qualified for harsh industrial environments including HVAC, factory automation, and building controls. |
Pinout & Package
Package: 8-pin, 2mm × 2mm, 0.5mm pitch TDFN (package code T822CN+1), thermally enhanced with exposed pad (connected to GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input | Primary input for 4.5V–60V supply; requires local 1µF X7R ceramic bypass to GND for noise suppression and transient response. |
| EN/UVLO (Pin 2) | Enable & Input UVLO Control | Active-high enable with programmable turn-on threshold (1.215V typ); connects to resistor divider from VIN to set custom input undervoltage lockout. |
| VCC (Pin 3) | Internal LDO Output | 5V ±2.5% regulated supply for internal logic and gate drivers; must be bypassed with ≥1µF ceramic capacitor to GND. |
| FB/VOUT (Pin 4) | Feedback Input | Connects to resistor divider for adjustable output; internal 0.9V reference enables precise VOUT = 0.9 × (1 + R1/R2) configuration. |
| MODE (Pin 5) | Control Mode Selection | Latched at startup: GND = forced-PWM (fixed fSW), open = PFM (pulse-skipping, higher light-load efficiency). |
| RESET (Pin 6) | Open-Drain Fault Monitor | Pulls low when VOUT falls below 92% of regulation; high-impedance 2ms after VOUT rises above 95%; requires external pull-up. |
| GND (Pin 7) | Power & Signal Ground | Common return for VIN, VCC, FB/VOUT, and LX; must connect to low-impedance ground plane and tie to exposed pad. |
| LX (Pin 8) | Switch Node | Connection to inductor switch node; drives external 68µH inductor; high-impedance during shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Topology | Integrated high-side pMOS (1.75Ω) and low-side nMOS (0.6Ω) eliminate need for external Schottky diode, reducing BOM count and improving full-load efficiency. |
| Internal Compensation | Eliminates external compensation network - simplifies design, reduces footprint, and ensures stable loop response across temperature and load. |
| All-Ceramic Capacitor Support | Enables use of small, reliable, low-ESR ceramic input/output caps (1µF CIN, 22µF COUT typical), avoiding bulkier tantalum or electrolytic alternatives. |
| Monotonic Startup into Prebiased Output | Prevents reverse current flow during power-up when output is already biased - critical for multi-rail systems with sequenced supplies. |
| CISPR32 Class B Compliance | Meets conducted and radiated EMI limits without additional filtering, easing EMC certification for industrial end equipment. |
Applications
| Industrial Sensors | 4–20mA Current Loops |
|---|---|
Use Scenario: Powering analog sensor front-ends (e.g., pressure, temperature transmitters) in remote field installations with limited board space and wide input voltage variation (e.g., 12–48V DC bus). IC Role / Device Role / Timing Role: Primary point-of-load regulator generating stable 3.3V or 5V from unregulated industrial bus; delivers clean, low-noise supply with monotonic startup. Use Value: Enables direct connection to 24V/48V lines without pre-regulator; 92% efficiency minimizes self-heating in sealed enclosures; -40°C to +125°C rating ensures reliability in outdoor sensor housings. | Use Scenario: Supplying loop-powered transmitter circuits where the DC-DC must operate from the 4–20mA loop itself or auxiliary 24V supply while maintaining tight output regulation and low quiescent current. IC Role / Device Role / Timing Role: Local regulator providing isolated, low-noise bias for op-amps, DACs, and signal conditioning stages; operates in PFM mode to minimize idle current draw. Use Value: 2.2µA shutdown current extends battery life in backup configurations; adjustable output allows precise 2.5V/3.3V reference generation; RESET pin enables fault reporting to PLC controller. |
| HVAC and Building Control | High-Voltage LDO Replacement |
Use Scenario: Replacing inefficient linear regulators in HVAC controllers, smart thermostats, and zone actuators powered from 24V AC/DC supplies with significant ripple and line transients. IC Role / Device Role / Timing Role: High-efficiency buck converter replacing 78xx-style LDOs; handles input surges up to 60V and maintains regulation during brownouts down to 4.5V. Use Value: Reduces thermal dissipation by >80% vs. LDOs at 400mA load; built-in hiccup-mode OCP prevents latch-up during motor startup surges; RESET signals MCU on undervoltage events. | Use Scenario: Upgrading legacy designs using discrete high-voltage LDOs (e.g., 40V-input) that suffer from poor efficiency, thermal derating, and limited output current. IC Role / Device Role / Timing Role: Direct drop-in replacement for high-voltage LDOs in PoL applications requiring >300mA output; provides same input range but with switching efficiency and thermal headroom. Use Value: Eliminates heatsink requirement; supports 400mA continuous load at full 60V input without derating; internal soft-start prevents inrush-induced reset of downstream logic. |
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 |
|---|---|---|---|
| LM5164QDDARQ1 | Automotive-grade (AEC-Q100), 3–65V input, 300mA max, 400kHz fSW, no integrated VCC LDO - requires external bias. | Targeted at automotive infotainment and body electronics; lacks RESET and monotonic prebias startup. | Choose for AEC-Q100 compliance and extended temp range (-40°C to +150°C), but verify external bias and fault-monitoring requirements. |
| TPS564201 | 4.5–17V input, 4A output, 500kHz fSW, integrated FETs, no PFM mode - PWM-only operation. | Optimized for low-voltage, high-current consumer/industrial apps; insufficient input range for 48V systems. | Choose only if input stays ≤17V and >400mA current is required; not suitable for 24V/48V industrial rails due to VIN limit. |
Compared with LM5164QDDARQ1 and TPS564201, the MAX17640CATA+T uniquely combines 60V input capability, 400mA output, integrated 5V VCC LDO, RESET monitoring, and monotonic prebias startup in a 2mm × 2mm package - making it optimal for compact, high-reliability industrial PoL designs where input voltage range and fault visibility are critical.
Availability
MAX17640CATA+T is available at Aetrix Electronics and suitable for industrial sensors, 4–20mA current loops, and HVAC control systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX17640CATA+T 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 technologies, serving industrial, automotive, communications, and healthcare markets.
The MAX17640 family belongs to Analog Devices' Himalaya power portfolio, engineered specifically for cooler, smaller, and simpler industrial power supplies - emphasizing integration, efficiency, and ruggedness in extreme operating conditions.
FAQ
What output voltage range does the MAX17640CATA+T support?
The MAX17640CATA+T supports an adjustable output voltage range from 0.9V to 0.89 × VIN. Using an external resistor divider on the FB/VOUT pin, designers can set precise outputs such as 1.8V, 2.5V, 3.3V, 5V, or 12V. Its internal 0.9V reference ensures ±1.3% accuracy over temperature and load, and the MAX17640CATA+T datasheet provides detailed calculation examples for common configurations.
How does the MODE pin affect MAX17640CATA+T operation?
The MODE pin on the MAX17640CATA+T determines control mode at power-up: grounded selects forced-PWM (constant 500kHz switching, suitable for noise-sensitive systems), while left unconnected enables PFM (pulse-skipping at light loads for >90% efficiency down to ~1mA). Mode selection is latched and cannot be changed dynamically during operation - the MAX17640CATA+T must be cycled through shutdown to reconfigure.
Does the MAX17640CATA+T require external compensation components?
No, the MAX17640CATA+T features fully internal compensation - no external RC network is needed. This simplifies PCB layout, reduces bill-of-materials cost, and guarantees stable loop response across the full operating range (-40°C to +125°C) and load conditions (0–400mA). The internal compensation is optimized for standard 68µH inductors and ceramic output capacitors, as validated in the MAX17640CATA+T typical application circuits.
What is the purpose of the RESET pin on the MAX17640CATA+T?
The RESET pin on the MAX17640CATA+T is an open-drain output that monitors regulated output voltage: it asserts low when VOUT drops below 92% of nominal regulation and returns to high-impedance 2ms after VOUT rises above 95%. This provides system-level fault signaling to MCUs or supervisors. An external pull-up resistor (typically 10kΩ to 3.3V or 5V) is required, and the MAX17640CATA+T RESET remains active during hiccup-mode overcurrent events.
Can the MAX17640CATA+T start up into a prebiased output?
Yes, the MAX17640CATA+T supports monotonic startup into a prebiased output in both PFM and forced-PWM modes - meaning it will not discharge the output capacitor when powered on while VOUT is already present. This feature prevents bus contention and unintended resets in multi-rail systems, such as those with FPGAs or processors requiring strict power sequencing. The MAX17640CATA+T achieves this via controlled gate drive timing and current-limit behavior during initial soft-start ramp.
MAX17640CATA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Himalaya
- Package/Case:
- 8-WFDFN
- Packaging:
- Tape & Reel (TR)
- 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):
- 60V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 53.4V
- 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)
MAX17640CATA+T FAQ
1.How can I place an order for MAX17640CATA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17640CATA+T 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 MAX17640CATA+T reliable?
The price and inventory of MAX17640CATA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17640CATA+T is usually 5 days.
3.What payment methods are accepted for MAX17640CATA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17640CATA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17640CATA+T?
MAX17640CATA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17640CATA+T 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 MAX17640CATA+T?
For technical support, including MAX17640CATA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17640CATA+T requirements.
6.How does Aetrix verify that MAX17640CATA+T is sourced from the original manufacturer or authorized distributors?
All MAX17640CATA+T 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 MAX17640CATA+T meets industry standards.
7.What is the process for return or replacement of MAX17640CATA+T?
All MAX17640CATA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17640CATA+T, 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 MAX17640CATA+T part is unused and in its original packaging.
Return procedure for MAX17640CATA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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