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Analog Devices Inc./Maxim Integrated MAX17644AATE+
- Part No.:
- MAX17644AATE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX17644AATE+.pdf
- Description:
- IC REG BUCK 3.3V 2.7A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:636
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Product details
Overview
MAX17644AATE+ from Maxim Integrated is a fixed 3.3V, 2.7A synchronous step-down DC-DC converter with integrated MOSFETs, operating from 4.5V to 36V input. It features peak-current mode control, ±1.2% output voltage regulation over –40°C to +125°C, 400kHz–2.2MHz programmable switching frequency, and internal compensation-enabling compact, low-component-count power supplies for industrial point-of-load applications.
For engineers reviewing the MAX17644AATE+ datasheet, MAX17644AATE+ pinout, MAX17644AATE+ application, or MAX17644AATE+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with precise functional and application-level differences.
Technical Context
The MAX17644AATE+ implements peak-current mode control with internal transconductance error amplifier, slope compensation, and cycle-by-cycle current limiting (4.0A typical peak limit). Its MODE/SYNC pin selects between forced PWM, PFM (pulse-skipping), or DCM operation-directly affecting light-load efficiency and output ripple.
It integrates high-side (125–250mΩ) and low-side (80–160mΩ) nMOSFETs, supports prebiased startup, provides open-drain RESET monitoring (92–95% VFB window), and uses EXTVCC switchover (4.7V threshold) to improve efficiency at high VIN by bypassing the internal 5V LDO.
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 Voltage | Fixed 3.3V - factory-trimmed; no external resistor divider required, simplifying layout and improving accuracy stability. |
| Max Output Current | 2.7A continuous - specified across full temperature range (–40°C to +125°C ambient), enabling robust load handling in embedded systems. |
| Feedback Accuracy | ±1.2% over –40°C to +125°C - ensures tight regulation under thermal stress, critical for sensitive analog or FPGA core supplies. |
| Switching Frequency | 400kHz to 2.2MHz (programmable via RT pin) - allows optimization of size (higher fSW → smaller inductor/capacitors) vs. EMI/efficiency trade-offs. |
| Efficiency Peak | 95.41% - achieved at mid-load with optimized layout; enabled by synchronous rectification and low RDS(on) MOSFETs. |
| Shutdown Current | 2.8μA - enables ultra-low-power standby in battery-backed or energy-sensitive systems. |
Pinout & Package
Package: 16-pin, 3mm × 3mm TQFN (exposed pad, package code T1633+5C) with θJA = 33°C/W on multilayer board - optimized for thermal performance in space-constrained industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN/UVLO | Enable / Input UVLO Control | Active-high enable; resistor-divider from VIN sets turn-on threshold (1.215V typ); pull low to disable device. |
| 2 VCC | Internal 5V LDO Output | Powers internal logic and gate drivers; requires 2.2μF ceramic bypass to SGND; not intended for external loading. |
| 3 SGND | Signal Ground Reference | Reference node for FB, SS, MODE/SYNC, RESET; must be separated from PGND in layout to minimize noise coupling. |
| 4 MODE/SYNC | Control Mode Selection / Clock Sync Input | Unconnected = PFM; SGND = forced PWM; VCC = DCM; also accepts external clock (1.1–1.4× fSW) for synchronization. |
| 5 SS | Soft-Start Timing Input | Capacitor from SS to SGND sets ramp time; prevents inrush current and enables monotonic startup into prebiased outputs. |
| 6 FB | Feedback Input | Direct connection to 3.3V output (no divider); monitors regulated voltage with ±1.2% accuracy across temperature. |
| 7 RT | Switching Frequency Programming | Resistor to SGND sets fSW (400kHz–2.2MHz); unconnected = default 400kHz; enables EMI tuning and component size reduction. |
| 8 RESET | Open-Drain Power-Good Output | Asserts low when FB falls below 92% of nominal; deasserts 1024 cycles after FB rises above 95%; requires external pullup. |
| 9 EXTVCC | External Auxiliary Supply Input | Connect to 5V output to power internal circuitry, reducing LDO losses and improving efficiency at high VIN (>12V). |
| 10 BST | Bootstrap Capacitor Terminal | Connects 0.1μF ceramic capacitor to LX; supplies gate drive voltage for high-side MOSFET during switching transitions. |
| 11–12 LX | Switching Node Outputs | High-current connections to inductor; dual pins reduce parasitic inductance and improve thermal dissipation. |
| 13–14 PGND | Power Ground Terminals | Low-impedance return path for high di/dt currents; must connect directly to thermal pad and bulk input capacitors. |
| 15–16 VIN | Main Power Input Pins | Accept 4.5V–36V; dual pins reduce IR drop and improve current sharing; require local 2.2μF ceramic decoupling to PGND. |
| EP | Exposed Thermal Pad | Mandatory connection to SGND plane via ≥6 thermal vias; primary heat path for junction-to-board conduction (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 diode, reducing BOM count and conduction loss. |
| Internal Compensation | Eliminates external Type-II/III compensation network - reduces component count, layout sensitivity, and validation effort for all output variants. |
| Programmable Light-Load Modes | PFM (1μA quiescent), DCM, or forced PWM selectable via MODE/SYNC - enables >90% efficiency down to 1mA load without sacrificing regulation. |
| Hiccup-Mode Overcurrent Protection | Triggers at 4.7A runaway current or FB < 2.13V (for MAX17644A); suspends switching for 32,768 cycles - limits power dissipation during short-circuit faults. |
| Prebiased Startup Support | Both FETs remain off until first PWM pulse - prevents reverse current flow into precharged output, avoiding system-level brownouts or damage. |
Applications
| Industrial Control Power Supplies | General-Purpose Point-of-Load |
|---|---|
|
Use Scenario: Powering PLC I/O modules, sensor signal conditioners, and fieldbus interface ICs in harsh factory environments with 24V rail. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator delivering 2.7A with hiccup-mode OCP and -40°C to +125°C operation. Use Value: Eliminates need for external current-sense resistors or compensation components while maintaining ±1.2% regulation under thermal cycling. |
Use Scenario: Local regulation for microcontroller cores, ADC references, or FPGA I/O banks on dense PCBs with limited board area. IC Role / Device Role / Timing Role: Compact 3.3V PoL converter using 3mm × 3mm TQFN and all-ceramic output capacitors. Use Value: Achieves 95.41% peak efficiency and 2.8μA shutdown current, extending runtime in always-on edge devices. |
| Distributed Supply Regulation | Base Station Power Supplies |
|
Use Scenario: Secondary regulation stage downstream of 48V intermediate bus in telecom equipment, powering RF front-end bias rails. IC Role / Device Role / Timing Role: High-input-voltage (up to 36V) synchronous buck with EXTVCC support to maintain efficiency at elevated VIN. Use Value: Reduces thermal load by routing VCC from 5V output instead of internal LDO-critical for multi-rail, high-density baseband boards. |
Use Scenario: Powering small-cell radio unit digital subsystems requiring clean, stable 3.3V under variable ambient temperatures. IC Role / Device Role / Timing Role: CISPR32 Class B compliant DC-DC with adjustable frequency (400kHz–2.2MHz) to avoid sensitive RF bands. Use Value: Enables EMI filtering optimization via frequency tuning while maintaining 92–95% RESET window for reliable system sequencing. |
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 |
|---|---|---|---|
| LM61480RQWR | Fixed 3.3V output, 4.5–36V input, 3.5A rating, 500kHz–2.2MHz fSW, but requires external compensation and lacks EXTVCC. | Higher current capability suits heavier loads, but added compensation complexity increases design time and layout sensitivity. | Select LM61480RQWR only if >2.7A output current is required and layout resources allow for external compensation network integration. |
| TPS543320RTWR | Adjustable output (0.6–5.5V), 4–18V input, 3A rating, integrated PMBus interface, but narrower input range and no PFM mode. | Targeted at digitally managed power systems; unsuitable for 24V/36V industrial inputs or ultra-low-quiescent applications. | Choose TPS543320RTWR only when digital telemetry, margining, or dynamic voltage scaling are required-and input stays ≤18V. |
Compared with LM61480RQWR and TPS543320RTWR, the MAX17644AATE+ uniquely combines fixed 3.3V accuracy, full 4.5–36V operation, internal compensation, and sub-3μA shutdown in a 3mm × 3mm package-making it optimal for cost-sensitive, thermally constrained industrial PoL designs where simplicity and reliability outweigh programmability needs.
Availability
MAX17644AATE+ is available at Aetrix Electronics and suitable for industrial control power supplies, general-purpose point-of-load regulation, and distributed supply regulation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for MAX17644AATE+ 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, automotive, and communications markets.
The MAX17644AATE+ belongs to the Himalaya series-designed specifically for cooler, smaller, and simpler high-voltage DC-DC solutions in space- and thermally-constrained industrial applications.
FAQ
What is the output voltage tolerance of the MAX17644AATE+ over temperature?
The MAX17644AATE+ maintains ±1.2% feedback voltage regulation accuracy across its full operating temperature range of –40°C to +125°C. This specification applies to the internal 3.3V reference and is guaranteed by design and characterization-not just typical values at +25°C. The MAX17644AATE+ achieves this via factory trimming and built-in temperature compensation, ensuring stable 3.3V output even in thermally aggressive industrial enclosures.
Does the MAX17644AATE+ support prebiased output startup?
Yes, the MAX17644AATE+ supports monotonic, prebiased output startup. When enabled, both high-side and low-side MOSFETs remain off until the first PWM command is issued, preventing reverse current flow into an already charged output rail. This behavior avoids system-level brownouts or latch-up in cascaded power architectures and is confirmed in the MAX17644AATE+ datasheet's "Prebiased Output" section.
How does the EXTVCC pin improve efficiency in the MAX17644AATE+?
The EXTVCC pin on the MAX17644AATE+ enables auxiliary supply switchover: when EXTVCC exceeds 4.7V (typical), the internal 5V LDO is disabled and VCC is powered directly from the external source-reducing conduction loss and boosting efficiency, especially at high input voltages (e.g., 24V or 36V). For the MAX17644AATE+, connecting EXTVCC to the 3.3V output is invalid; it must only be used with 5V outputs per datasheet guidance.
What protection features are integrated into the MAX17644AATE+?
The MAX17644AATE+ integrates hiccup-mode overcurrent protection (triggered at 4.7A runaway current or FB < 2.13V), thermal shutdown (+165°C with 10°C hysteresis), output undervoltage detection (RESET assertion at 92% VFB), adjustable EN/UVLO, and minimum on/off-time limits (52ns/140ns). All protections are hardware-based, require no external components, and are fully characterized across –40°C to +125°C.
Can the MAX17644AATE+ operate synchronously with an external clock?
Yes, the MAX17644AATE+ supports external clock synchronization via the MODE/SYNC pin. An external clock within 1.1× to 1.4× the programmed fSW (e.g., 440–560kHz for 400kHz default) is accepted; after detecting 16 rising edges, the internal oscillator locks to the external frequency and forces PWM mode. Pulse width must exceed 50ns, and off-time must be ≥160ns-verified in the MAX17644AATE+ Electrical Characteristics table.
MAX17644AATE+ 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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)
MAX17644AATE+ FAQ
1.How can I place an order for MAX17644AATE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17644AATE+ 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 MAX17644AATE+ reliable?
The price and inventory of MAX17644AATE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17644AATE+ is usually 5 days.
3.What payment methods are accepted for MAX17644AATE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17644AATE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17644AATE+?
MAX17644AATE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17644AATE+ 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 MAX17644AATE+?
For technical support, including MAX17644AATE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17644AATE+ requirements.
6.How does Aetrix verify that MAX17644AATE+ is sourced from the original manufacturer or authorized distributors?
All MAX17644AATE+ 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 MAX17644AATE+ meets industry standards.
7.What is the process for return or replacement of MAX17644AATE+?
All MAX17644AATE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17644AATE+, 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 MAX17644AATE+ part is unused and in its original packaging.
Return procedure for MAX17644AATE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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