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Analog Devices Inc./Maxim Integrated MAX17644CATE+
- Part No.:
- MAX17644CATE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX17644CATE+.pdf
- Description:
- IC REG BUCK ADJ 2.7A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,106
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Product details
Overview
The MAX17644CATE+ from Maxim Integrated is a high-efficiency, synchronous step-down DC-DC converter with integrated MOSFETs, operating from 4.5V to 36V input and delivering up to 2.7A output current. It features adjustable output voltage (0.9V to 90% of VIN), peak-current mode control, and ±1.2% feedback regulation accuracy over –40°C to +125°C - used in industrial point-of-load and base station power supplies.
For engineers reviewing the MAX17644CATE+ datasheet, MAX17644CATE+ pinout, MAX17644CATE+ application, or MAX17644CATE+ equivalent, key selection considerations include its 16-pin TQFN package, 400kHz–2.2MHz programmable switching frequency, PFM/DCM/PWM mode flexibility, EXTVCC auxiliary supply support, and built-in hiccup-mode overload protection.
Technical Context
The MAX17644CATE+ implements peak-current mode control with internal transconductance error amplifier, slope compensation, and cycle-by-cycle current limiting. Its MODE/SYNC pin selects between PWM (constant frequency), PFM (pulse-skipping for light-load efficiency), or DCM (discontinuous conduction) operation - each with distinct inductor current behavior and efficiency trade-offs.
It integrates high-side (125–250mΩ) and low-side (80–160mΩ) nMOSFETs, supports prebiased startup, and includes an open-drain RESET output triggered by FB voltage deviation (92–95% of setpoint). Thermal shutdown activates at +165°C with 10°C hysteresis, and hiccup-mode OCP uses 32,768-cycle timeout for short-circuit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports wide industrial and telecom input rails without external pre-regulation. |
| Output Current | Up to 2.7A continuous - sufficient for FPGA core, DSP, or ASIC point-of-load applications. |
| Output Voltage Range | Adjustable from 0.9V to 90% of VIN - enables flexible rail generation including sub-1V logic supplies. |
| Feedback Accuracy | ±1.2% over –40°C to +125°C - ensures stable regulation across extended industrial temperature range. |
| Switching Frequency | 400kHz to 2.2MHz (programmable via RT resistor) - allows optimization of size vs. EMI vs. efficiency. |
| Efficiency Peak | 95.41% - reduces thermal load and improves system-level power density in compact designs. |
| Shutdown Current | 2.8μA - enables ultra-low-power standby in battery-backed or energy-sensitive systems. |
| Package | 16-pin TQFN (3mm × 3mm) - provides high thermal performance and small PCB footprint. |
Pinout & Package
MAX17644CATE+ is housed in a 16-pin, 3mm × 3mm TQFN package with exposed pad (EP) for thermal management. Pin 1 is EN/UVLO; pins 11–12 are LX; pins 13–14 are PGND; pins 15–16 are VIN; EP must be connected to SGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Input UVLO Threshold Input | Configurable turn-on threshold (1.19–1.26V rising); pull low to disable or connect to resistor divider for input-voltage-dependent startup. |
| VCC (Pin 2) | Internal 5V LDO Output | Powers internal circuitry and low-side gate driver; bypassed with 2.2μF ceramic capacitor to SGND. |
| SGND (Pin 3) | Signal Ground Reference | Reference node for FB, MODE/SYNC, SS, RT, RESET; separate from PGND to minimize noise coupling. |
| MODE/SYNC (Pin 4) | Control Mode Selection / External Clock Input | Selects PWM (SGND), PFM (open), or DCM (VCC); also accepts external clock (1.1–1.4× fSW) for synchronization. |
| SS (Pin 5) | Soft-Start Timing Input | Connects to SGND via capacitor to set ramp time; prevents inrush current during startup into prebiased outputs. |
| FB (Pin 6) | Feedback Voltage Input | Monitors output via resistor divider; regulates to 0.9V reference (±1.2%) for MAX17644C variant. |
| RT (Pin 7) | Switching Frequency Programming | Resistor-to-SGND sets fSW from 400kHz to 2.2MHz; unconnected defaults to 400kHz. |
| RESET (Pin 8) | Open-Drain Power-Good Output | Asserts low when FB falls below 92% of target; deasserts 1024 cycles after FB rises above 95%. |
| EXTVCC (Pin 9) | Auxiliary Supply Input | Accepts 4.56–4.84V external supply to power VCC internally - improves efficiency at high VIN. |
| BST (Pin 10) | Bootstrap Capacitor Terminal | Connects 0.1μF ceramic capacitor to LX to drive high-side MOSFET gate above VIN. |
| LX (Pins 11,12) | Switching Node | Connects to inductor switch node; carries high di/dt current - requires tight layout and Kelvin routing. |
| PGND (Pins 13,14) | Power Ground Return | Low-impedance return path for high-current LX and VIN paths; must be tied to SGND only at single point. |
| VIN (Pins 15,16) | Main Input Power Supply | 4.5V–36V input; decoupled with 2.2μF ceramic capacitor placed close to pins 15/16 and PGND pins. |
| EP | Exposed Thermal Pad | Must be soldered to SGND plane with ≥6 thermal vias for effective junction-to-board heat transfer (θJC = 4°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Integrated high-side (125–250mΩ) and low-side (80–160mΩ) nMOSFETs eliminate external Schottky loss and reduce BOM count. |
| Internal Compensation | Eliminates external Type-II/III compensation network - simplifies design and improves stability across full output voltage range. |
| Multi-Mode Operation | PFM (light-load efficiency), DCM (balanced efficiency/ripple), and PWM (EMI-controlled fixed frequency) selectable via MODE/SYNC pin. |
| Robust Protection Suite | Hiccup-mode OCP (32,768-cycle timeout), thermal shutdown (+165°C), RESET monitoring, monotonic prebiased startup, and adjustable EN/UVLO. |
| High-Frequency Capability | 52–80ns minimum on-time enables >2MHz operation - supports ultra-small inductors and capacitors for space-constrained designs. |
| Industrial Temperature Rating | Specified for –40°C to +125°C ambient (–40°C to +150°C junction) - suitable for harsh environments without derating. |
Applications
| Industrial Control Power Supplies | Base Station Power Supplies |
|---|---|
|
Use Scenario: Powering PLC I/O modules, motor drivers, and fieldbus interfaces in factory automation cabinets. IC Role / Device Role / Timing Role: Primary 5V/3.3V/1.2V point-of-load regulator converting 24V DC bus to processor and sensor rails. Use Value: Wide 4.5V–36V input accommodates brownout and surge conditions; hiccup-mode OCP prevents thermal runaway during shorted field wiring. |
Use Scenario: Generating intermediate rails (e.g., 5V, 3.3V, 1.8V) from 48V telecom supply in 4G/5G remote radio units. IC Role / Device Role / Timing Role: Synchronous buck converter providing regulated, low-noise supply to FPGAs, ADCs, and RF front-end ICs. Use Value: 95.41% peak efficiency and EXTVCC support reduce heat in sealed enclosures; 2.2MHz capability shrinks filter components. |
| Distributed Supply Regulation | High Voltage Single-Board Systems |
|
Use Scenario: Local regulation on multi-layer PCBs with long power distribution traces, such as test equipment backplanes. IC Role / Device Role / Timing Role: Distributed DC-DC converter minimizing IR drop and improving transient response at point-of-load. Use Value: Adjustable output (0.9V–90% VIN) enables precise rail matching; ±1.2% FB accuracy maintains tight tolerance under load step changes. |
Use Scenario: Powering SoCs, DDR memory, and peripherals on high-voltage industrial compute boards (e.g., 24V or 36V input). IC Role / Device Role / Timing Role: Main system regulator delivering 1.2V core, 1.8V I/O, and 3.3V peripheral rails from single input source. Use Value: Prebiased startup prevents reverse current into powered-up downstream circuits; RESET output sequences downstream logic safely. |
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 |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5V–65V input, 1.5A output, 100ns min on-time, no integrated EXTVCC path or hiccup-mode OCP. | Automotive AEC-Q100 qualified; lacks RESET output and FB accuracy spec over full temp range. | Choose LM5164QPWPRQ1 only if automotive qualification and higher VIN are required - not drop-in for MAX17644CATE+. |
| TPS54240DGQR | 3.5V–42V input, 2.5A output, external MOSFETs required, no internal compensation or EXTVCC support. | Requires external compensation and bootstrap components; lower integration increases layout complexity and BOM cost. | Choose TPS54240DGQR only if adjustable frequency range beyond 2.2MHz or external FET control is needed - not pin-compatible. |
Compared with LM5164QPWPRQ1 and TPS54240DGQR, the MAX17644CATE+ delivers higher output current (2.7A), tighter FB accuracy (±1.2%), integrated EXTVCC switchover, and hiccup-mode OCP - making it superior for industrial point-of-load where reliability, thermal safety, and minimal external components are critical.
Availability
MAX17644CATE+ is available at Aetrix Electronics and suitable for industrial control power supplies, base station power supplies, distributed supply regulation, and high voltage single-board systems requiring stable component supply and long-term production continuity.
Supply support for MAX17644CATE+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX17644CATE+ belongs to the Himalaya series of DC-DC converters, designed specifically for cooler, smaller, and simpler industrial and telecom power supply solutions with high integration and robust protection.
FAQ
What is the output voltage adjustment range for the MAX17644CATE+?
The MAX17644CATE+ supports adjustable output voltage from 0.9V up to 90% of the input voltage (VIN). This is achieved using an external resistor divider connected to the FB pin, referencing the internal 0.9V feedback threshold. The ±1.2% regulation accuracy over –40°C to +125°C ensures stable rail generation across industrial temperature extremes. The MAX17644CATE+ does not support fixed-output variants - only the adjustable configuration.
Does the MAX17644CATE+ support external clock synchronization?
Yes, the MAX17644CATE+ supports external clock synchronization via the MODE/SYNC pin. When 16 rising edges of an external clock (1.1× to 1.4× the programmed fSW) are detected, the device locks to that frequency and operates in PWM mode. The external clock pulse width must exceed 50ns, and off-time must be ≥160ns. This feature enables EMI reduction through frequency dithering or system-level clock alignment in multi-rail designs using the MAX17644CATE+.
How does the MAX17644CATE+ handle startup into a prebiased output?
The MAX17644CATE+ implements monotonic prebiased startup: both high-side and low-side MOSFETs remain off until the internal PWM comparator commands the first pulse, preventing reverse current flow into an already-powered output rail. This avoids damaging downstream circuitry and ensures smooth, controlled ramp-up aligned with the internal reference. The soft-start timing (set by SS capacitor) applies regardless of prebias condition, and the RESET output remains asserted until FB reaches 95% of target.
What protection features are integrated into the MAX17644CATE+?
The MAX17644CATE+ integrates hiccup-mode overcurrent protection (triggered by peak current limit or FB undervoltage), thermal shutdown (+165°C with 10°C hysteresis), adjustable EN/UVLO, open-drain RESET output with 92–95% FB window, and monotonic prebiased startup. It also includes valley current limiting, minimum on/off time constraints, and EXTVCC switchover for improved efficiency - all implemented without external components, enhancing system reliability in industrial environments.
Can the MAX17644CATE+ operate with all-ceramic output capacitors?
Yes, the MAX17644CATE+ is fully compatible with all-ceramic output capacitors due to its internal Type-II compensation and stable phase margin across the full output voltage and load range. The datasheet explicitly recommends all-ceramic layouts for compactness and reliability. Combined with low ESR requirements and support for X7R dielectrics, this enables robust, low-profile designs - a key advantage confirmed in the "All-Ceramic Capacitors, Compact Layout" benefit listed for the MAX17644CATE+.
MAX17644CATE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Himalaya
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tray
- 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+ FAQ
1.How can I place an order for MAX17644CATE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17644CATE+ 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+ reliable?
The price and inventory of MAX17644CATE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17644CATE+ is usually 5 days.
3.What payment methods are accepted for MAX17644CATE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17644CATE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17644CATE+?
MAX17644CATE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17644CATE+ 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+?
For technical support, including MAX17644CATE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17644CATE+ requirements.
6.How does Aetrix verify that MAX17644CATE+ is sourced from the original manufacturer or authorized distributors?
All MAX17644CATE+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX17644CATE+?
All MAX17644CATE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17644CATE+, 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+ part is unused and in its original packaging.
Return procedure for MAX17644CATE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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