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Analog Devices Inc./Maxim Integrated MAX17644BATE+
- Part No.:
- MAX17644BATE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX17644BATE+.pdf
- Description:
- IC REG BUCK 5V 2.7A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:20,935
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Product details
Overview
The MAX17644BATE+ from Maxim Integrated is a fixed 5V-output, synchronous step-down DC-DC converter with integrated high- 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 built-in compensation eliminating external loop components - deployed in industrial control power supplies and high-voltage single-board systems.
For engineers reviewing the MAX17644BATE+ datasheet, MAX17644BATE+ pinout, MAX17644BATE+ application, or MAX17644BATE+ equivalent, this page delivers verified technical context, real-world design meaning for key specs (e.g., 400kHz–2.2MHz programmable switching frequency, 52ns minimum on-time, 2.8μA shutdown current), and validated alternative parts for fixed 5V buck conversion in harsh ambient environments.
Technical Context
The MAX17644BATE+ implements peak-current mode control with internal transconductance error amplifier, slope compensation, and cycle-by-cycle current limiting. Its MODE/SYNC pin selects between forced PWM, PFM (pulse-skipping), or DCM (discontinuous conduction) modes - enabling >95% peak efficiency and enhanced light-load performance without external compensation.
It integrates a 5V LDO (VCC) powered either from VIN or EXTVCC (when ≥4.7V), supports prebiased startup, and includes hiccup-mode overload protection triggered at 4.7A runaway current limit or FB undervoltage (3.11V–3.33V). Thermal shutdown activates at 165°C with 10°C hysteresis, and RESET asserts when FB falls below 92% of nominal 5V output.
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 bus systems without external pre-regulation. |
| Output Voltage | Fixed 5.0V ±1.2% - factory-trimmed for precision; no external resistor divider required for 5V applications. |
| Output Current | Up to 2.7A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, and industrial sensors. |
| Switching Frequency | 400kHz to 2.2MHz (programmable via RT resistor) - enables compact magnetics and EMI optimization in space-constrained designs. |
| Min On/Off Time | 52ns / 140ns - allows stable operation at high VIN/VOUT ratios (e.g., 24V→5V) and high-frequency layouts. |
| Shutdown Current | 2.8μA - enables ultra-low-power standby in battery-backed or energy-harvesting systems. |
| Thermal Shutdown | 165°C junction with 10°C hysteresis - protects against sustained overload or poor PCB thermal design. |
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 UVLO Threshold Input | Drives device ON above 1.215V; connects to resistor divider from VIN to set turn-on voltage; pull low to disable. |
| 2 VCC | Internal 5V LDO Output | Powers internal logic and low-side gate driver; bypassed with 2.2μF ceramic capacitor to SGND. |
| 3 SGND | Signal Ground Reference | Reference node for FB, SS, MODE/SYNC, RT, RESET; separate from PGND to minimize noise coupling. |
| 4 MODE/SYNC | Control Mode Selection / External Clock 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 | Connects to capacitor to SGND; sets ramp time for controlled output voltage rise and inrush current limiting. |
| 6 FB | Feedback Input (5V Fixed) | Direct connection to VOUT; monitors regulated 5V output; triggers RESET if voltage drops below 4.6V (92%). |
| 7 RT | Switching Frequency Programming | Resistor-to-SGND sets fSW from 400kHz to 2.2MHz; unconnected = default 400kHz. |
| 8 RESET | Open-Drain Fault Indicator | Asserts low on FB undervoltage, thermal shutdown, or EN/UVLO dropout; requires external pull-up. |
| 9 EXTVCC | External Auxiliary Supply Input | Accepts 5V output to power internal LDO, reducing losses 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 Outputs | High-current paths to inductor; must be routed with minimal loop area to reduce EMI and switching losses. |
| 13–14 PGND | Power Ground Terminals | Low-impedance return path for high di/dt currents; connect directly to thermal pad and input/output capacitors. |
| 15–16 VIN | Main Power Input Pins | Accept 4.5V–36V; 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 ≥6 thermal vias for effective heat dissipation and θJA compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Integrated 125mΩ high-side / 80mΩ low-side nMOSFETs eliminate external Schottky diode and reduce conduction loss. |
| Internal Compensation | Factory-compensated across full output range - removes need for external Type-II/III compensation network. |
| Multi-Mode Operation | Configurable PWM (constant frequency), PFM (light-load efficiency), or DCM (balanced ripple/efficiency) via MODE/SYNC pin. |
| Robust Protection Suite | Hiccup-mode OCP (4.7A runaway limit), thermal shutdown (165°C), RESET monitoring (92–95% window), and prebiased startup. |
| Industrial Temperature Range | Specified for –40°C to +125°C ambient (–40°C to +150°C junction) - qualified for factory automation and base station use. |
Applications
| Industrial Control Power Supplies | General-Purpose Point-of-Load |
|---|---|
|
Use Scenario: Powering PLC I/O modules, motor drivers, and fieldbus interfaces in factory automation cabinets with 24V DC rails. IC Role / Device Role / Timing Role: Primary 5V buck regulator converting 24V bus to clean, regulated 5V for digital logic and communication ICs. Use Value: Delivers 2.7A with <±1.2% regulation across temperature, enabling reliable operation without derating in enclosed enclosures. |
Use Scenario: Local 5V supply for microcontrollers, ADCs, and interface ICs on dense PCBs where space and thermal headroom are limited. IC Role / Device Role / Timing Role: Compact, self-contained step-down converter with integrated MOSFETs and internal compensation. Use Value: 3mm × 3mm TQFN package and all-ceramic capacitor support enable <100mm² solution size and simplified layout. |
| Distributed Supply Regulation | Base Station Power Supplies |
|
Use Scenario: Secondary 5V rail generation in telecom equipment where multiple isolated or semi-isolated domains require local regulation. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter supporting dynamic load steps typical of RF front-end biasing. Use Value: 95.41% peak efficiency and 2.8μA shutdown current reduce system power loss and thermal load in multi-rail systems. |
Use Scenario: Powering control logic, FPGAs, and monitoring circuits in 4G/5G remote radio units operating from 24V or 48V intermediate bus. IC Role / Device Role / Timing Role: Robust 5V regulator with hiccup-mode OCP and CISPR32 Class B EMI compliance for outdoor deployment. Use Value: Withstands voltage transients and operates reliably from –40°C to +125°C ambient - meets Telcordia GR-63-CORE requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQR | Fixed 5V output, 4.5V–36V input, 8A rating, 500kHz–2.2MHz fSW, but requires external compensation and lacks RESET output. | Higher current capability suits larger SoCs; absence of RESET complicates system-level fault reporting. | Choose LM61480RQR only if >2.7A output or adjustable frequency with external loop tuning is required. |
| TPS54561QDGQRQ1 | Automotive-grade (AEC-Q100), 4.5V–60V input, adjustable output, 5A rating, but fixed 5V requires external resistors and no internal compensation. | Designed for automotive under-hood use; higher VIN range adds cost and complexity for industrial 24V-only applications. | Prefer MAX17644BATE+ for cost-sensitive, space-constrained industrial 5V PoL where qualification beyond AEC-Q100 is unnecessary. |
Compared with LM61480RQR and TPS54561QDGQRQ1, the MAX17644BATE+ offers factory-trimmed 5V output, internal compensation, integrated RESET, and optimized thermal performance in a smaller 3mm × 3mm footprint - making it the most direct fit for industrial 2.7A fixed-5V applications requiring minimal BOM count and rapid design-in.
Availability
MAX17644BATE+ 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 traceable sourcing.
Supply support for MAX17644BATE+ 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+ belongs to the Himalaya series of high-voltage DC-DC converters designed to deliver cooler, smaller, and simpler power solutions for demanding industrial and telecom applications.
FAQ
What is the output voltage tolerance of the MAX17644BATE+ over temperature?
The MAX17644BATE+ maintains ±1.2% output voltage regulation accuracy across its full operating temperature range of –40°C to +125°C ambient. This specification applies specifically to the fixed 5V variant (MAX17644B) and is guaranteed by design and characterization - not just typical behavior - ensuring consistent performance in uncontrolled thermal environments like factory floors or outdoor enclosures.
Does the MAX17644BATE+ require external compensation components?
No, the MAX17644BATE+ does not require external compensation components. It features built-in compensation across the entire output-voltage range, a key differentiator of the Himalaya series. This eliminates the need for external Type-II or Type-III compensation networks, simplifying design, reducing BOM count, and improving reliability - confirmed in both the General Description and Detailed Description sections of the official datasheet.
Can the MAX17644BATE+ operate with a prebiased output?
Yes, the MAX17644BATE+ supports prebiased output startup. During start-up into a precharged output, both high-side and low-side switches remain off until the PWM comparator commands the first pulse, preventing reverse current flow and enabling smooth ramp-up to the target 5V output. This behavior is explicitly documented in the "Prebiased Output" section of the datasheet and ensures safe integration into systems with hold-up capacitors or shared rails.
What protection features are integrated into the MAX17644BATE+?
The MAX17644BATE+ integrates hiccup-mode overcurrent protection (triggered at 4.7A runaway current limit), thermal shutdown (165°C with 10°C hysteresis), output voltage monitoring with open-drain RESET (asserts low at 92% of 5V), adjustable EN/UVLO, and monotonic soft-start. These protections are fully implemented in silicon and do not require external circuitry - enabling robust operation in industrial environments with variable loads and ambient conditions.
Is the MAX17644BATE+ pin-compatible with other variants in the MAX17644 family?
Yes, the MAX17644BATE+ shares identical pinout and package (16-pin TQFN, 3mm × 3mm) with MAX17644AATE+ (3.3V) and MAX17644CATE+ (adjustable). All three variants use the same PCB footprint and thermal pad layout, allowing design reuse across output voltage requirements - though FB connections and external components (e.g., RT resistor) may differ based on application needs.
MAX17644BATE+ 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):
- 5V
- 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)
MAX17644BATE+ FAQ
1.How can I place an order for MAX17644BATE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17644BATE+ 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+ reliable?
The price and inventory of MAX17644BATE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17644BATE+ is usually 5 days.
3.What payment methods are accepted for MAX17644BATE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17644BATE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17644BATE+?
MAX17644BATE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17644BATE+ 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+?
For technical support, including MAX17644BATE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17644BATE+ requirements.
6.How does Aetrix verify that MAX17644BATE+ is sourced from the original manufacturer or authorized distributors?
All MAX17644BATE+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX17644BATE+?
All MAX17644BATE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17644BATE+, 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+ part is unused and in its original packaging.
Return procedure for MAX17644BATE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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