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Analog Devices Inc./Maxim Integrated MAX17644BATE+T
- Part No.:
- MAX17644BATE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX17644BATE+T.pdf
- Description:
- IC REG BUCK ADJ 2.7A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
The MAX17644BATE+T from Maxim Integrated is a fixed 5V-output, synchronous step-down DC-DC converter with integrated high-side and low-side MOSFETs, operating from 4.5V to 36V input and delivering up to 2.7A continuous output current. It features peak-current mode control, ±1.2% output voltage regulation accuracy over –40°C to +125°C, and a 16-pin 3mm × 3mm TQFN package. It is used in industrial control power supplies and high-voltage single-board systems requiring compact, high-efficiency regulation.
For engineers reviewing the MAX17644BATE+T datasheet, MAX17644BATE+T pinout, MAX17644BATE+T application, or MAX17644BATE+T equivalent, key selection considerations include its fixed 5V output, 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 MAX17644BATE+T implements peak-current mode control with internal transconductance error amplifier, slope compensation, and cycle-by-cycle current limiting. Its MODE/SYNC pin configures operation in forced PWM (constant frequency), PFM (pulse-skipping at light load), or DCM (discontinuous conduction) modes - each altering inductor current behavior and efficiency trade-offs across load range.
It integrates a 5V LDO (VCC) powered from VIN or optionally from EXTVCC (≥4.7V), reducing power loss at high input voltages. The device includes monotonic soft-start via external capacitor on SS, open-drain RESET with 92–95% FB threshold hysteresis, and thermal shutdown at +165°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports wide industrial and automotive input rails without pre-regulation. |
| Output Voltage | Fixed 5.0V ±1.2% - guaranteed over full temperature range (–40°C to +125°C), no external feedback resistors required. |
| Output Current | Up to 2.7A continuous - specified across full ambient temperature range with proper PCB thermal design. |
| Switching Frequency | 400kHz to 2.2MHz (programmable via RT resistor) - enables optimization of size vs. EMI; supports external clock synchronization. |
| Efficiency Peak | 95.41% - achieved at mid-load under typical conditions; enhanced by PFM/DCM light-load modes and EXTVCC auxiliary supply. |
| Shutdown Current | 2.8μA - enables ultra-low power-off state for battery-backed or energy-sensitive systems. |
| Thermal Protection | 165°C junction shutdown with 10°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
Pinout & Package
Package: 16-pin TQFN (3mm × 3mm, exposed pad), RoHS-compliant, thermal resistance θJA = 33°C/W (4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN/UVLO | Enable / Input Undervoltage Lockout | Active-high enable; threshold 1.215V (rising), 1.09V (falling); configurable for input turn-on voltage via resistor divider. |
| 2 VCC | Internal 5V LDO Output | Supplies internal circuitry and low-side gate driver; requires 2.2μF ceramic bypass to SGND; not for external loading. |
| 3 SGND | Signal Ground Reference | Reference node for FB, MODE/SYNC, SS, RT, RESET; separate from PGND to minimize noise coupling into control loop. |
| 4 MODE/SYNC | Control Mode Selection / Clock Sync Input | Selects PWM (SGND), PFM (open), or DCM (VCC); accepts external clock (1.1–1.4× fSW) for synchronization. |
| 5 SS | Soft-Start Timing Input | Connect external capacitor to SGND to set controlled output ramp time; prevents inrush current and overshoot. |
| 6 FB | Feedback Input | Monitors regulated 5V output directly; internal reference = 5.0V ±1.2%; RESET asserts if FB falls below 92% of target. |
| 7 RT | Switching Frequency Programming | Resistor-to-SGND sets fSW from 400kHz (open) to 2.2MHz; formula: RRT(kΩ) = 21000/(fSW(kHz) − 1.7). |
| 8 RESET | Open-Drain Power-Good Output | Asserts low when FB < 92% of 5V or during thermal shutdown/EN deactivation; requires external pull-up. |
| 9 EXTVCC | Auxiliary Supply Input | Accepts 5V output to power internal LDO, improving efficiency at high VIN; connect to SGND if unused. |
| 10 BST | Bootstrap Capacitor Terminal | Connects 0.1μF ceramic capacitor to LX; provides gate drive voltage for high-side MOSFET. |
| 11–12 LX | Switching Node | Connects to inductor switch node; carries high di/dt; must be routed with minimal loop area for EMI control. |
| 13–14 PGND | Power Ground | High-current return path for MOSFETs and inductor; tie to EP and SGND via multiple thermal vias for thermal performance. |
| 15–16 VIN | Main Power Input | 4.5V–36V input; decouple 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 ≥9 thermal vias (0.3mm diameter) for θJA compliance and reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated high-side (125–250mΩ) and low-side (80–160mΩ) nMOSFETs eliminate external Schottky diode and associated losses. |
| Internal compensation | Full compensation network embedded - no external RC components needed for stability across 5V output and load range. |
| Multi-mode light-load optimization | PFM (1μA IQ), DCM, and forced PWM modes selectable via MODE/SYNC - maintains >85% efficiency down to 1mA load. |
| Robust fault protection | Hiccup-mode OCP (32,768-cycle timeout), thermal shutdown (+165°C), RESET monitoring, and prebiased start-up prevent damage and ensure system reliability. |
| Industrial-grade thermal rating | Specified for –40°C to +125°C ambient; junction limit +150°C - suitable for uncooled enclosures in factory automation and base stations. |
Applications
| Industrial Control Power Supplies | General-Purpose Point-of-Load |
|---|---|
|
Use Scenario: Powering PLC I/O modules, sensor interfaces, and microcontroller peripherals in harsh factory environments with 24V DC bus. IC Role / Device Role / Timing Role: Primary 5V buck regulator converting 24V rail to clean, regulated 5V for logic and analog subsystems. Use Value: Delivers 2.7A with ±1.2% regulation and hiccup-mode protection - eliminates need for secondary LDOs and improves system-level MTBF. |
Use Scenario: Local regulation on dense PCBs where space is constrained and multiple voltage domains coexist. IC Role / Device Role / Timing Role: Compact, all-ceramic solution replacing discrete buck controllers + MOSFETs + compensation network. Use Value: 3mm × 3mm TQFN footprint and internal compensation reduce BOM count by ≥4 components versus controller-based designs. |
| Distributed Supply Regulation | Base Station Power Supplies |
|
Use Scenario: Providing isolated 5V rails to remote RF front-end modules in 4G/5G macrocells with strict EMI limits. IC Role / Device Role / Timing Role: Secondary buck stage downstream of intermediate 12V bus, synchronized to system clock via MODE/SYNC pin. Use Value: External clock sync capability (1.1–1.4× fSW) enables deterministic EMI placement and avoids beat frequencies. |
Use Scenario: Powering FPGA configuration, memory, and management ASICs in telecom infrastructure equipment. IC Role / Device Role / Timing Role: High-reliability 5V source with RESET signaling and thermal monitoring for system health reporting. Use Value: Open-drain RESET with 92–95% FB hysteresis provides precise power-good assertion for FPGA configuration sequencing. |
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 |
|---|---|---|---|
| LM5164QDDARQ1 | Automotive AEC-Q100 qualified; 3–65V input; adjustable output only; requires external compensation. | Targeted at automotive infotainment and ADAS; lacks fixed 5V option and integrated EXTVCC switchover. | Choose LM5164QDDARQ1 only if AEC-Q100 certification and extended input range are mandatory; expect added layout complexity. |
| TPS54560QDGQRQ1 | 5.5–60V input; 5A output; adjustable output only; external compensation; no PFM/DCM light-load modes. | Used in heavy industrial motor drives; higher current but lower light-load efficiency and no RESET output. | Choose TPS54560QDGQRQ1 when >2.7A is required and fixed 5V output is not needed; accept higher quiescent current (140μA vs. 2.8μA). |
Compared with LM5164QDDARQ1 and TPS54560QDGQRQ1, the MAX17644BATE+T offers plug-and-play 5V regulation, superior light-load efficiency via PFM/DCM, and integrated RESET - reducing validation effort and component count in non-automotive industrial designs.
Availability
The MAX17644BATE+T 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 support, and consistent parametric performance.
Supply support for MAX17644BATE+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX17644BATE+T belongs to the Himalaya series of high-voltage DC-DC converters designed for cooler, smaller, and simpler power supply solutions in demanding industrial and telecom environments.
FAQ
What is the output voltage tolerance of the MAX17644BATE+T over temperature?
The MAX17644BATE+T guarantees ±1.2% output voltage regulation accuracy over the full operating temperature range of –40°C to +125°C. This specification applies specifically to the fixed 5V output variant and is measured at the FB pin under load conditions per the datasheet test setup. The MAX17644BATE+T achieves this using an internal precision reference and trimmed feedback network - no external calibration is required.
Can the MAX17644BATE+T operate with an external clock signal?
Yes, the MAX17644BATE+T supports external clock synchronization via the MODE/SYNC pin. When 16 rising edges of an external clock within 1.1× to 1.4× the programmed fSW are detected, the internal oscillator locks to that frequency and forces PWM mode operation. The minimum pulse width must exceed 50ns, and off-time must be ≥160ns. This feature is confirmed in the Electrical Characteristics table and Functional Block Diagram of the MAX17644BATE+T datasheet.
Does the MAX17644BATE+T require external compensation components?
No, the MAX17644BATE+T includes fully integrated loop compensation optimized for its fixed 5V output configuration. This eliminates the need for external RC networks typically required with controller-based buck ICs. The internal compensation ensures stability across the full 4.5V–36V input range and 0–2.7A load range - verified in the MAX17644BATE+T evaluation kit testing and documented in the "Built-in Compensation" section of the datasheet.
What protection features does the MAX17644BATE+T include?
The MAX17644BATE+T includes hiccup-mode overcurrent protection (triggered at 4.7A runaway limit), thermal shutdown at +165°C with 10°C hysteresis, output voltage monitoring with open-drain RESET output (asserts low at 92% of 5V), adjustable EN/UVLO, and monotonic startup into prebiased outputs. All protections are silicon-verified and characterized across temperature - no external components are needed to activate them.
How does the EXTVCC pin improve efficiency in the MAX17644BATE+T?
The EXTVCC pin allows the MAX17644BATE+T to power its internal 5V LDO from the regulated 5V output instead of VIN when EXTVCC exceeds 4.7V. This reduces conduction loss in the internal LDO, especially at high input voltages (e.g., 24V or 36V), thereby increasing overall system efficiency. The switchover threshold is 4.7V (rising) and 4.45V (falling), and the feature is explicitly validated for the MAX17644BATE+T in the Electrical Characteristics table.
MAX17644BATE+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)
MAX17644BATE+T FAQ
1.How can I place an order for MAX17644BATE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17644BATE+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 MAX17644BATE+T reliable?
The price and inventory of MAX17644BATE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17644BATE+T is usually 5 days.
3.What payment methods are accepted for MAX17644BATE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17644BATE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17644BATE+T?
MAX17644BATE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17644BATE+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 MAX17644BATE+T?
For technical support, including MAX17644BATE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17644BATE+T requirements.
6.How does Aetrix verify that MAX17644BATE+T is sourced from the original manufacturer or authorized distributors?
All MAX17644BATE+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 MAX17644BATE+T meets industry standards.
7.What is the process for return or replacement of MAX17644BATE+T?
All MAX17644BATE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17644BATE+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 MAX17644BATE+T part is unused and in its original packaging.
Return procedure for MAX17644BATE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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