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Analog Devices Inc./Maxim Integrated MAX17645BATA+T
- Part No.:
- MAX17645BATA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WFDFN
- Datasheet:
-
MAX17645BATA+T.pdf
- Description:
- IC REG BUCK ADJ 1A 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,363
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Product details
Overview
MAX17645BATA+T from Analog Devices is a 4.5V–36V input, 1A synchronous step-down DC-DC converter in an 8-pin 2mm × 2mm TDFN package, featuring internal MOSFETs, fixed 650kHz switching frequency, PWM-only operation, and 0.9V to 89% VIN adjustable output voltage - deployed in factory automation power rails where high efficiency and thermal robustness are critical.
For engineers reviewing the MAX17645BATA+T datasheet, MAX17645BATA+T pinout, MAX17645BATA+T application, or MAX17645BATA+T equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed thermal and protection behavior, and real-world design context for industrial point-of-load conversion.
Technical Context
The MAX17645BATA+T implements peak-current-mode control with integrated high-side pMOS (RDS-ONH = 925mΩ max) and low-side nMOS (RDS-ONL = 300mΩ max), delivering up to 1A load current at 90% full-load efficiency (VIN = 24V, VOUT = 5V). It operates exclusively in forced PWM mode - no PFM - ensuring constant 650kHz switching across all loads.
It integrates internal loop compensation, fixed 3.15ms soft-start, programmable EN/UVLO (1.215V rising threshold), open-drain RESET with 95.5% rising/92% falling FB thresholds, and robust hiccup-mode overload protection triggered by either runaway current limit (2.44A typ) or VFB undervoltage (0.58V typ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports wide industrial input sources including 12V/24V rails and unregulated automotive-derived supplies. |
| Output Current | Up to 1A continuous - sufficient for powering microcontrollers, sensors, and I/O peripherals in embedded systems. |
| Switching Frequency | 650kHz (typ) - enables compact magnetics and reduces output ripple without requiring large LC filters. |
| Feedback Regulation | 0.900V ±1.1% over –40°C to +125°C - ensures stable output voltage across extreme ambient conditions. |
| Efficiency | 90% at VIN = 24V, VOUT = 5V, IOUT = 1A - minimizes heat generation in thermally constrained enclosures. |
| Shutdown Current | 2.2µA (typ) - enables ultra-low-power system standby states without external disconnect circuitry. |
| Thermal Protection | 166°C shutdown with 10°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
Pinout & Package
Package: 8-pin TDFN (2mm × 2mm, 0.5mm pitch), RoHS-compliant, moisture-sensitive level 1. Thermal resistance θJA = 72°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Power input supply | Accepts 4.5V–36V; requires local 2.2µF ceramic decoupling to PGND to suppress high di/dt noise. |
| 2 EN/UVLO | Enable and input UVLO control | Logic-enable input with 1.215V rising threshold; configurable via resistor divider to set turn-on voltage. |
| 3 VCC | Internal LDO output | 5V ±5% regulated supply for internal circuitry; bypassed with 1µF ceramic to SGND. |
| 4 FB | Feedback voltage sense | Monitors output via resistive divider; regulates to 0.900V reference with ±1.1% accuracy over temperature. |
| 5 RESET | Open-drain power-good signal | Asserts low when VOUT drops below 92% of setpoint; releases high-Z after 1.6ms delay when VOUT exceeds 95.5%. |
| 6 SGND | Signal ground reference | Reference plane for FB, EN/UVLO, RESET; must be connected to PGND at single point near output capacitor. |
| 7 PGND | Power ground return | High-current return path for LX and IN; connects directly to power ground plane to minimize switching loop inductance. |
| 8 LX | Switching node | Drives external inductor; high-impedance during shutdown; requires tight layout to reduce EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode - reduces conduction loss and improves efficiency at full load. |
| Integrated compensation | Removes need for external Type-II/III compensation network - simplifies layout and accelerates design cycle. |
| All-ceramic capacitor support | Enables ultra-compact PCB footprint using only X7R/X5R MLCCs - no electrolytics required for input/output filtering. |
| Monotonic startup into prebiased output | Prevents reverse current flow during power sequencing - essential for multi-rail systems with powered-up downstream ICs. |
| CISPR32 Class B compliance | Meets radiated emission limits for industrial equipment without additional shielding or filtering components. |
Applications
| Factory Automation Power Rail | Aftermarket Automotive Asset Tracker |
|---|---|
Use Scenario: Powering PLC I/O modules and fieldbus transceivers in enclosed cabinets with limited airflow. IC Role / Device Role / Timing Role: Primary 5V/1A point-of-load regulator converting 24V DC bus to logic supply. Use Value: 90% efficiency at full load reduces cabinet heat rise by >3W vs. legacy linear regulators, extending component lifetime. |
Use Scenario: Compact GPS/Cellular asset trackers mounted in vehicle engine bays or cargo compartments. IC Role / Device Role / Timing Role: Single-chip 3.3V/1A buck converter powering MCU, GNSS receiver, and LTE modem. Use Value: 2mm × 2mm TDFN package and integrated FETs shrink solution size by 40% vs. discrete controller + MOSFET designs. |
| Industrial Sensor Node | Ruggedized HMI Controller |
Use Scenario: Battery-backed wireless sensor nodes operating in -40°C to +85°C outdoor environments. IC Role / Device Role / Timing Role: Input-stage regulator accepting wide 9V–36V input from solar/battery hybrid sources. Use Value: -40°C to +125°C ambient rating and 2.2µA shutdown current enable multi-year battery life in low-duty-cycle deployments. |
Use Scenario: Touchscreen HMIs deployed in manufacturing cells with frequent ESD events and vibration. IC Role / Device Role / Timing Role: Robust 5V/1A supply for ARM Cortex-M7 processor and display driver ICs. Use Value: Built-in hiccup-mode OCP and thermal shutdown prevent latch-up during short-circuit faults caused by connector arcing or mechanical damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQWR | 4.5V–36V input, 8A output, 2.1MHz switching, requires external compensation; higher quiescent current (15µA) | Better suited for high-current, space-constrained applications needing faster transient response | Select LM61480RQWR when >1A output or <1µs load-step response is required; not drop-in due to different pinout and compensation scheme |
| TPS54332DR | 3.5V–28V input, 3A output, 570kHz switching, external MOSFETs, no integrated compensation | Offers higher current and wider VIN range but demands more external components and layout effort | Choose TPS54332DR for cost-sensitive, medium-volume designs where BOM flexibility outweighs integration benefits |
Compared with LM61480RQWR and TPS54332DR, the MAX17645BATA+T provides optimal balance of integration (internal FETs + compensation), thermal ruggedness (125°C ambient), and minimal footprint (2mm × 2mm) for 1A industrial PoL use - eliminating trade-offs between size, reliability, and design time.
Availability
MAX17645BATA+T is available at Aetrix Electronics and suitable for factory automation controllers, aftermarket automotive telematics units, and industrial sensor nodes requiring stable component supply, long-term manufacturability, and guaranteed RoHS compliance.
Supply support for MAX17645BATA+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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The MAX17645BATA+T belongs to Analog Devices' high-voltage synchronous buck converter family, engineered specifically for reliable, compact, and efficient point-of-load regulation in harsh industrial and transportation environments.
FAQ
What is the key functional difference between MAX17645BATA+T and MAX17645DATA+T?
The MAX17645BATA+T operates exclusively in forced PWM mode across all load conditions, ensuring constant 650kHz switching frequency - ideal for noise-sensitive applications. In contrast, the MAX17645DATA+T uses PFM mode at light loads to achieve higher efficiency but introduces variable frequency and higher output ripple. Both share identical pinout, package, and input/output specifications.
Does MAX17645BATA+T support monotonic startup into a prebiased output?
Yes, the MAX17645BATA+T supports monotonic startup into a prebiased output without discharging the output capacitor - a critical feature for systems with multiple power rails that power up asynchronously. This behavior is confirmed in the datasheet's Detailed Description section and applies specifically to the MAX17645B variant.
What is the maximum duty cycle supported by MAX17645BATA+T, and how does it affect minimum input voltage?
The MAX17645BATA+T supports a maximum duty cycle of 94% (typ), enabling operation down to VIN ≈ VOUT / 0.94. For example, to generate 5V output, the minimum valid input is ~5.32V - consistent with its 4.5V absolute minimum rating when accounting for MOSFET RDS-ON losses and inductor DCR.
Can MAX17645BATA+T be used with ceramic output capacitors only?
Yes, the MAX17645BATA+T is fully compatible with all-ceramic output capacitor designs. Its internal compensation and stability architecture are optimized for X7R/X5R MLCCs - no electrolytic or tantalum capacitors are required, enabling ultra-compact, high-reliability layouts per the Typical Application Circuits in the datasheet.
What protection features are built into MAX17645BATA+T?
The MAX17645BATA+T includes cycle-by-cycle peak current limiting (1.88A typ), runaway current limiting (2.44A typ), hiccup-mode overload recovery (100ms timeout), thermal shutdown (166°C junction, 10°C hysteresis), and open-drain RESET monitoring (92%/95.5% FB thresholds). All protections are active and verified across –40°C to +125°C ambient.
MAX17645BATA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- 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):
- 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)
MAX17645BATA+T FAQ
1.How can I place an order for MAX17645BATA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17645BATA+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 MAX17645BATA+T reliable?
The price and inventory of MAX17645BATA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17645BATA+T is usually 5 days.
3.What payment methods are accepted for MAX17645BATA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17645BATA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17645BATA+T?
MAX17645BATA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17645BATA+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 MAX17645BATA+T?
For technical support, including MAX17645BATA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17645BATA+T requirements.
6.How does Aetrix verify that MAX17645BATA+T is sourced from the original manufacturer or authorized distributors?
All MAX17645BATA+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 MAX17645BATA+T meets industry standards.
7.What is the process for return or replacement of MAX17645BATA+T?
All MAX17645BATA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17645BATA+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 MAX17645BATA+T part is unused and in its original packaging.
Return procedure for MAX17645BATA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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