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Analog Devices Inc./Maxim Integrated MAX17644CATE+T
- Part No.:
- MAX17644CATE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX17644CATE+T.pdf
- Description:
- IC REG BUCK ADJ 2.7A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,099
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Product details
Overview
MAX17644CATE+T from Maxim Integrated is a high-efficiency, synchronous step-down DC-DC converter with integrated MOSFETs, delivering up to 2.7A across a 4.5V–36V input range and supporting adjustable output voltages from 0.9V to 90% of VIN. It features peak-current mode control, ±1.2% feedback regulation accuracy over –40°C to +125°C, and operates in PWM/DCM/PFM modes for optimized light-load efficiency. Used in industrial control power supplies and high-voltage single-board systems.
For engineers reviewing the MAX17644CATE+T datasheet, MAX17644CATE+T pinout, MAX17644CATE+T application, or MAX17644CATE+T equivalent, key selection considerations include its 16-pin TQFN (3mm × 3mm) package, programmable 400kHz–2.2MHz switching frequency via RT resistor, internal compensation eliminating external loop components, and built-in RESET monitoring with 92–95% FB threshold hysteresis.
Technical Context
The MAX17644CATE+T implements peak-current mode control with slope compensation and an internal transconductance error amplifier, enabling stable regulation without external compensation networks. Its MODE/SYNC pin selects between constant-frequency PWM, pulse-skipping PFM, or discontinuous-conduction DCM operation-each affecting light-load efficiency, output ripple, and frequency stability.
It integrates high-side (125–250mΩ) and low-side (80–160mΩ) nMOSFETs, supports prebiased startup, and includes hiccup-mode overload protection triggered by either runaway current (>4.7A) or FB undervoltage (<92% setpoint). Thermal shutdown activates at +165°C with 10°C hysteresis, and EXTVCC switchover improves efficiency when the output is ≥4.7V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports wide industrial input rails including 12V, 24V, and 36V systems without external pre-regulation. |
| Output Current | Up to 2.7A continuous - sufficient for powering FPGAs, microcontrollers, and analog subsystems in compact designs. |
| Output Voltage Range | Adjustable from 0.9V to 90% of VIN - enables flexible point-of-load regulation for core, I/O, or auxiliary rails. |
| Feedback Accuracy | ±1.2% over –40°C to +125°C - ensures tight regulation across full industrial temperature range without calibration. |
| Switching Frequency | 400kHz to 2.2MHz (programmable via RT resistor) - allows optimization of size (higher fSW → smaller L/C) vs. efficiency (lower fSW → lower switching loss). |
| Shutdown Current | 2.8μA - enables ultra-low-power standby in battery-backed or energy-sensitive applications. |
| Package | 16-pin TQFN (3mm × 3mm, T1633+5C) - thermally enhanced surface-mount package with exposed pad for efficient heat dissipation. |
Pinout & Package
MAX17644CATE+T is housed in a 16-pin, 3mm × 3mm TQFN package (package code T1633+5C) with exposed thermal pad (EP) connected to SGND. The pinout supports compact PCB layout with dual VIN, PGND, and LX pins for low-inductance power routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN/UVLO | Enable / Input Undervoltage Lockout | Configurable turn-on threshold (1.19–1.26V rising); connects to resistor divider from VIN to set input UVLO point. |
| 2 VCC | Internal 5V LDO Output | Powers internal circuitry and low-side driver; requires 2.2μF ceramic bypass to SGND; not intended for external loading. |
| 3 SGND | Signal Ground Reference | Reference node for FB, MODE/SYNC, SS, RT, RESET; must be separated from PGND in layout to minimize noise coupling. |
| 4 MODE/SYNC | Operating Mode Control / Clock Sync Input | Selects PWM (SGND), PFM (open), or DCM (VCC); also accepts external clock (1.1–1.4× fSW) for synchronization. |
| 5 SS | Soft-Start Timing Input | Connects to capacitor to SGND; sets monotonic output ramp time and prevents inrush current during startup. |
| 6 FB | Feedback Input | Monitors output via external resistor divider; regulates to 0.9V reference (±1.2%) for MAX17644C variant. |
| 7 RT | Switching Frequency Programming | Resistor-to-SGND sets fSW from 400kHz to 2.2MHz; unconnected = default 400kHz. |
| 8 RESET | Open-Drain Power-Good Output | Asserts low if FB falls below 92% of target; deasserts 1024 cycles after FB rises above 95% - provides reliable system reset signaling. |
| 9 EXTVCC | External Auxiliary Supply Input | Accepts ≥4.7V supply (e.g., buck output) to power internal LDO, reducing losses and improving efficiency at high VIN. |
| 10 BST | Bootstrap Capacitor Terminal | Connects 0.1μF ceramic capacitor to LX; supplies gate drive voltage for high-side MOSFET. |
| 11–12 LX | Switching Node Outputs | High-current connections to inductor; dual pins reduce trace inductance and improve thermal performance. |
| 13–14 PGND | Power Ground Terminals | Low-impedance return path for high di/dt currents; must be tied to EP and routed with minimal loop area. |
| 15–16 VIN | Input Power Supply Inputs | Accepts 4.5V–36V; dual pins support high-current input decoupling with local 2.2μF ceramic capacitors. |
| EP | Exposed Thermal Pad | Internally connected to SGND; requires multiple thermal vias to inner ground plane for effective junction-to-ambient heat transfer (θJA = 33°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Integrated high-side (125–250mΩ) and low-side (80–160mΩ) MOSFETs eliminate need for external Schottky diode and reduce conduction losses. |
| Internal Compensation | Eliminates external Type-II/III compensation network - reduces BOM count, board space, and design iteration time. |
| Programmable Light-Load Efficiency Modes | PFM (pulse skipping), DCM (discontinuous conduction), and forced PWM enable >95% peak efficiency and <50μA quiescent current in PFM mode. |
| Robust Protection Suite | Hiccup-mode OCP (4.7A runaway limit), thermal shutdown (+165°C), RESET monitoring (92–95% FB window), and prebiased startup prevent damage under fault conditions. |
| Wide Operating Temperature Range | Specified from –40°C to +125°C ambient (–40°C to +150°C junction) - qualified for industrial and harsh-environment deployments. |
Applications
| Industrial Control Power Supplies | General-Purpose Point-of-Load |
|---|---|
Use Scenario: Powering PLC I/O modules, motor drivers, and sensor interfaces in factory automation cabinets with 24V DC bus. IC Role / Device Role / Timing Role: Primary non-isolated DC-DC regulator converting 24V rail to 3.3V/5V/12V logic and analog supplies. Use Value: High input voltage tolerance (up to 36V) accommodates line transients; hiccup-mode OCP sustains operation during short-term overloads common in motor control. | Use Scenario: Local regulation for FPGA core voltage (0.85–1.2V), DDR memory termination (1.2–1.5V), or MCU I/O rails on dense PCBs. IC Role / Device Role / Timing Role: Adjustable-output synchronous buck delivering precise, low-noise power with fast transient response. Use Value: 0.9V feedback reference and ±1.2% accuracy ensure stable core voltage under load steps; 2.2MHz max fSW enables sub-2mm inductors. |
| Distributed Supply Regulation | Base Station Power Supplies |
Use Scenario: Secondary regulation in telecom equipment where intermediate 12V or 48V backplane feeds multiple downstream loads. IC Role / Device Role / Timing Role: Efficient step-down stage converting intermediate bus to ASIC/FPGA supply voltages with minimal heat generation. Use Value: EXTVCC switchover improves efficiency at high VIN; 400kHz–2.2MHz fSW programming allows EMI tuning to avoid sensitive RF bands. | Use Scenario: Power conversion in 4G/5G remote radio units (RRUs) requiring high reliability and thermal resilience in outdoor enclosures. IC Role / Device Role / Timing Role: Main DC-DC converter supplying power amplifiers and transceivers from 28V or 48V DC input. Use Value: –40°C to +125°C rating and thermal shutdown ensure uptime in uncontrolled environments; CISPR32 Class B compliance simplifies EMI certification. |
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 |
|---|---|---|---|
| LM61480RQR | Fixed 5V/3.3V variants only; no adjustable version; 4.5V–36V input; 8A output; requires external compensation. | Higher current capability but lacks MAX17644CATE+T's adjustable output and internal compensation - better suited for fixed-rail, high-current designs. | Select LM61480RQR when output voltage is fixed and >2.7A is required; choose MAX17644CATE+T for flexibility, smaller solution size, and simplified design. |
| TPS546D24ARVFT | 4.5V–18V input; 10A output; PMBus interface; digital control; requires external compensation and configuration EEPROM. | Targeted at digitally managed power systems with telemetry and dynamic voltage scaling - adds complexity versus MAX17644CATE+T's analog simplicity. | Select TPS546D24ARVFT for systems needing real-time telemetry or adaptive voltage scaling; MAX17644CATE+T fits cost-sensitive, analog-only, space-constrained applications. |
Compared with LM61480RQR and TPS546D24ARVFT, the MAX17644CATE+T offers unique value in adjustable-output, fully integrated compensation, and ultra-compact 3mm × 3mm footprint - making it optimal for designs prioritizing BOM reduction, layout simplicity, and thermal efficiency at ≤2.7A.
Availability
MAX17644CATE+T is available at Aetrix Electronics and suitable for industrial control power supplies, general-purpose point-of-load regulation, distributed supply systems, and base station power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX17644CATE+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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing applications.
The MAX17644 series belongs to Maxim's Himalaya power portfolio, engineered to deliver cooler, smaller, and simpler DC-DC solutions - specifically targeting high-input-voltage, medium-current industrial and infrastructure applications.
FAQ
What is the output voltage adjustment range supported by the MAX17644CATE+T?
The MAX17644CATE+T supports an adjustable output voltage range from 0.9V up to 90% of the input voltage (VIN). This is achieved using an external resistor divider connected to the FB pin, referenced to the internal 0.9V feedback threshold. The ±1.2% regulation accuracy over –40°C to +125°C ensures stable output across industrial operating conditions. Unlike the fixed-output MAX17644A (3.3V) and MAX17644B (5V), the MAX17644CATE+T variant provides design flexibility for custom voltage rails.
Does the MAX17644CATE+T require external compensation components?
No, the MAX17644CATE+T does not require external compensation components. It features built-in Type-II compensation across its full output-voltage range, eliminating the need for external resistors and capacitors typically used in traditional voltage-mode or current-mode controllers. This integration reduces bill-of-materials count, saves PCB area, and simplifies design validation - a key differentiator of the Himalaya series. The internal compensation is optimized for stability with all-ceramic output capacitors.
How does the MODE/SYNC pin affect the efficiency and operation of the MAX17644CATE+T?
The MODE/SYNC pin configures the MAX17644CATE+T into three distinct operating modes: PWM (constant frequency, all loads), PFM (pulse-skipping, highest light-load efficiency), or DCM (discontinuous conduction, balanced efficiency/ripple). In PFM mode (MODE/SYNC open), quiescent current drops to ~50μA, enabling >90% efficiency at 1mA load. In PWM mode (MODE/SYNC grounded), switching remains constant but light-load efficiency decreases. External clock synchronization is also supported for EMI reduction.
What protection features are integrated into the MAX17644CATE+T?
The MAX17644CATE+T integrates hiccup-mode overcurrent protection (triggered at 4.7A runaway current or FB <92%), thermal shutdown (+165°C with 10°C hysteresis), output voltage monitoring with open-drain RESET (92–95% FB window), programmable EN/UVLO, and monotonic prebiased startup. These features collectively prevent damage during short circuits, overtemperature events, input brownouts, and hot-insertion scenarios - ensuring robust operation in industrial environments without requiring external protection circuitry.
Can the MAX17644CATE+T be synchronized to an external clock signal?
Yes, the MAX17644CATE+T supports external clock synchronization via the MODE/SYNC pin. When 16 consecutive rising edges of an external clock (frequency between 1.1× and 1.4× the programmed fSW) are detected, the internal oscillator locks to that frequency and forces PWM operation. The minimum pulse width is 50ns, and off-time must exceed 160ns. This capability enables EMI reduction through frequency dithering or alignment with system clocks - critical in noise-sensitive applications like base stations and medical equipment.
MAX17644CATE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- 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):
- 32.4V
- Current - Output:
- 2.7A
- Frequency - Switching:
- 400kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (3x3)
MAX17644CATE+T FAQ
1.How can I place an order for MAX17644CATE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17644CATE+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 MAX17644CATE+T reliable?
The price and inventory of MAX17644CATE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17644CATE+T is usually 5 days.
3.What payment methods are accepted for MAX17644CATE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17644CATE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17644CATE+T?
MAX17644CATE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17644CATE+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 MAX17644CATE+T?
For technical support, including MAX17644CATE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17644CATE+T requirements.
6.How does Aetrix verify that MAX17644CATE+T is sourced from the original manufacturer or authorized distributors?
All MAX17644CATE+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 MAX17644CATE+T meets industry standards.
7.What is the process for return or replacement of MAX17644CATE+T?
All MAX17644CATE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17644CATE+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 MAX17644CATE+T part is unused and in its original packaging.
Return procedure for MAX17644CATE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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