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Analog Devices Inc./Maxim Integrated MAX17645BATA+
- Part No.:
- MAX17645BATA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WFDFN
- Datasheet:
-
MAX17645BATA+.pdf
- Description:
- IC REG BUCK ADJ 1A 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:178
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Product details
Overview
MAX17645BATA+ from Analog Devices is a synchronous step-down DC-DC converter IC designed for high-efficiency power conversion in industrial and automotive point-of-load applications. It operates from 4.5V to 36V input, delivers up to 1A output current, regulates output voltage from 0.9V to 89% of VIN, features internal MOSFETs and compensation, and achieves 90% full-load efficiency at 24VIN/5VOUT.
For engineers reviewing the MAX17645BATA+ datasheet, MAX17645BATA+ pinout, MAX17645BATA+ application, or MAX17645BATA+ equivalent, this page provides verified technical context, confirmed pin functions, real-world application constraints (e.g., -40°C to +125°C ambient, CISPR32 Class B compliance), and validated alternative options for PWM-mode 1A buck conversion.
Technical Context
The MAX17645BATA+ implements peak-current-mode control with fixed 650kHz switching frequency and monotonic soft-start (3.15ms typ). Its integrated high-side pMOS (RDS-ONH = 925mΩ max) and low-side nMOS (RDS-ONL = 300mΩ max) enable synchronous operation without external Schottky diodes. The device uses an internal transconductance error amplifier and slope compensation to stabilize regulation across 0.9V–89% VIN outputs.
It supports programmable EN/UVLO (1.215V rising threshold), open-drain RESET monitoring (92–95.5% VFB trip), and robust protection including hiccup-mode overload response (100ms timeout), thermal shutdown at 166°C (10°C hysteresis), and runaway current limiting (2.44A typ). The MAX17645B variant operates exclusively in forced-PWM mode-no PFM-ensuring constant-frequency operation for EMI-sensitive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports wide industrial and automotive battery inputs without pre-regulation. |
| Output Current | Up to 1A - sufficient for powering microcontrollers, sensors, and communication ICs in compact designs. |
| Switching Frequency | 650kHz (typ) - enables use of small 6.8µH inductors and reduces output ripple filtering requirements. |
| Feedback Regulation Accuracy | ±1.1% over -40°C to +125°C - ensures stable rail accuracy across harsh operating environments. |
| Shutdown Current | 2.2µA (typ) - minimizes battery drain in always-on or low-power standby systems. |
| Efficiency @ 24V/5V/1A | 90% (typ) - reduces thermal load and eliminates need for heatsinking in sealed enclosures. |
| Operating Temperature | -40°C to +125°C ambient - qualified for factory automation and under-hood automotive applications. |
Pinout & Package
MAX17645BATA+ is housed in an 8-pin TDFN package (2mm × 2mm, 0.5mm pitch) with exposed thermal pad. The package supports high-power density layouts and efficient heat transfer to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Power Input | Primary HV input node; requires local 2.2µF ceramic decoupling to PGND to suppress switching noise. |
| 2 EN/UVLO | Enable & UVLO Control | Logic-level enable with adjustable turn-on threshold via resistor divider; true shutdown below 0.75V disables internal circuitry. |
| 3 VCC | LDO Output | Internally regulated 5V supply (4.75–5.25V) for gate drivers and control logic; bypassed with 1µF ceramic to SGND. |
| 4 FB | Voltage Feedback | High-impedance input sensing output voltage via resistor divider; sets regulation point with ±1.1% accuracy over temperature. |
| 5 RESET | Open-Drain Status | Power-good signal asserted high-Z after 1.6ms delay when VOUT reaches 95.5% of target; pulled low on fault or startup. |
| 6 SGND | Signal Ground | Analog reference for FB, EN/UVLO, RESET; must be connected to PGND at single point near output capacitor. |
| 7 PGND | Power Ground | Return path for high-current LX switching loop; connects directly to power ground plane to minimize EMI and voltage spikes. |
| 8 LX | Switching Node | Drives external inductor; high-impedance during shutdown; requires tight layout to reduce ringing and radiated emissions. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous FETs | Eliminates external Schottky diode and associated conduction losses, reducing BOM count and board area. |
| Internal Compensation | Removes need for external Type-II/III compensation network-simplifies design and improves stability across all output voltages. |
| Monotonic Soft-Start | 3.15ms ramp prevents output overshoot and inrush current when powering pre-biased rails in multi-rail systems. |
| CISPR32 Class B Compliance | Meets stringent conducted and radiated EMI limits for industrial equipment without added filtering components. |
| Robust Protection Suite | Hiccup-mode overload, thermal shutdown (166°C), and cycle-by-cycle current limiting ensure safe operation under short-circuit or overtemperature faults. |
Applications
| Factory Automation Sensors | Automotive Asset Trackers |
|---|---|
Use Scenario: Powering industrial IO-Link sensors and PLC I/O modules in enclosed cabinets with limited airflow. IC Role / Device Role / Timing Role: Primary 5V/1A point-of-load regulator converting 24V field bus to clean microcontroller and transceiver supply. Use Value: High 90% efficiency at full load minimizes heat buildup inside sealed enclosures, extending component lifetime and avoiding thermal derating. | Use Scenario: Compact GPS/telematics units mounted in vehicle cabins or under-hood locations with wide input voltage swings. IC Role / Device Role / Timing Role: Synchronous buck converter generating stable 3.3V rail for MCU, GNSS receiver, and cellular modem from 7–36V automotive battery. Use Value: -40°C to +125°C ambient rating and built-in thermal/hiccup protection ensure reliable operation during engine cranking and hot soak conditions. |
| Industrial HMI Displays | Ruggedized Edge Gateways |
Use Scenario: Powering 4.3"–7" TFT-LCD panels and touch controllers in factory HMIs exposed to dust, vibration, and temperature cycling. IC Role / Device Role / Timing Role: Adjustable-output (0.9V–89% VIN) buck regulator delivering 3.3V/1A with precise feedback accuracy (±1.1%) across temperature. Use Value: Internal soft-start and monotonic startup into prebiased outputs prevent display flicker or controller lockup during cold boot or brownout recovery. | Use Scenario: DIN-rail mounted edge gateways aggregating Modbus, CAN, and Ethernet data in manufacturing plants with high EMI. IC Role / Device Role / Timing Role: EMI-optimized 650kHz buck converter supplying 5V/1A to ARM-based SoC and isolated interface ICs. Use Value: CISPR32 Class B compliance and integrated MOSFETs eliminate need for external EMI filters, reducing solution size and certification risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM-mode synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQWR | 4.5–36V input, 1A, 2.1MHz switching, no internal compensation, requires external loop compensation. | Higher frequency enables smaller inductors but increases EMI sensitivity; lacks RESET output and hiccup-mode protection. | Choose LM61480RQWR only if board space is constrained and EMI filtering can be added externally. |
| TPS54332DR | 3.5–28V input, 3A, 600kHz, external MOSFETs required, no integrated FETs or compensation. | Higher current capability but larger solution size due to discrete FETs and compensation network; no thermal shutdown hysteresis spec. | Choose TPS54332DR only if >1A output is needed and layout area is not critical. |
Compared with LM61480RQWR and TPS54332DR, the MAX17645BATA+ offers lower system-level BOM count (integrated FETs + compensation), tighter thermal protection (166°C shutdown with 10°C hysteresis), and guaranteed CISPR32 Class B compliance-making it optimal for space-constrained, thermally demanding industrial applications where reliability and certification speed are priorities.
Availability
MAX17645BATA+ is available at Aetrix Electronics and suitable for factory automation sensors, automotive asset trackers, and ruggedized edge gateways requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX17645BATA+ 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, communications, and healthcare markets.
The MAX17645 product line delivers high-voltage, high-efficiency synchronous buck converters optimized for harsh-environment point-of-load regulation-designed to replace discrete solutions with minimal external components while meeting stringent EMI and thermal reliability requirements.
FAQ
What is the maximum duty cycle supported by the MAX17645BATA+?
The MAX17645BATA+ supports a maximum duty cycle of 91% (typical), enabling output voltages up to 89% of the input voltage. This allows direct generation of 5V from a 6V minimum input or 3.3V from a 3.7V Li-ion source without cascading regulators. The duty cycle limit is enforced internally to maintain stable operation and prevent shoot-through during high-VIN/low-VOUT conditions.
Does the MAX17645BATA+ require external compensation components?
No, the MAX17645BATA+ includes fully integrated control loop compensation across its entire output voltage range (0.9V to 89% VIN). This eliminates the need for external Type-II or Type-III compensation networks, reducing component count, board area, and design validation effort. The internal compensation is optimized for stability with standard ceramic output capacitors and typical inductor values.
What protection features does the MAX17645BATA+ include?
The MAX17645BATA+ integrates hiccup-mode overload protection (triggered by runaway current limit ≥2.44A), thermal shutdown at 166°C (with 10°C hysteresis), cycle-by-cycle peak current limiting (1.88A typ), and output undervoltage detection via the RESET pin. These features operate autonomously without external circuitry, ensuring safe operation during short circuits, overloads, or elevated ambient temperatures.
Can the MAX17645BATA+ start up into a prebiased output?
Yes, the MAX17645BATA+ supports monotonic startup into a prebiased output without discharging the output capacitor-a critical feature for multi-rail systems where other supplies may already be active. This behavior is maintained in both PWM and PFM modes and prevents system reset glitches or latch-up during power sequencing in complex embedded platforms.
What is the purpose of the RESET pin on the MAX17645BATA+?
The RESET pin on the MAX17645BATA+ is an open-drain output that signals power-good status: it goes high-impedance 1.6ms after the output reaches 95.5% of its nominal voltage and pulls low when the output falls below 92% of nominal. It also asserts low during hiccup-mode faults and thermal shutdown, providing system-level fault indication without requiring additional supervisory ICs.
MAX17645BATA+ 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)
MAX17645BATA+ FAQ
1.How can I place an order for MAX17645BATA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17645BATA+ 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+ reliable?
The price and inventory of MAX17645BATA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17645BATA+ is usually 5 days.
3.What payment methods are accepted for MAX17645BATA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17645BATA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17645BATA+?
MAX17645BATA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17645BATA+ 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+?
For technical support, including MAX17645BATA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17645BATA+ requirements.
6.How does Aetrix verify that MAX17645BATA+ is sourced from the original manufacturer or authorized distributors?
All MAX17645BATA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX17645BATA+?
All MAX17645BATA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17645BATA+, 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+ part is unused and in its original packaging.
Return procedure for MAX17645BATA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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