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Analog Devices Inc./Maxim Integrated MAX17644AATE+T
- Part No.:
- MAX17644AATE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX17644AATE+T.pdf
- Description:
- IC REG BUCK ADJ 2.7A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,359
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Product details
Overview
The MAX17644AATE+T from Maxim Integrated is a fixed 3.3V-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. It is used in industrial control power supplies and high-voltage single-board systems requiring compact, efficient point-of-load regulation.
For engineers reviewing the MAX17644AATE+T datasheet, MAX17644AATE+T pinout, MAX17644AATE+T application, or MAX17644AATE+T equivalent, key selection considerations include its fixed 3.3V output, 16-pin 3mm × 3mm TQFN package, 400kHz–2.2MHz programmable switching frequency, hiccup-mode overload protection, and EXTVCC-assisted efficiency optimization for 5V-output-compatible systems.
Technical Context
The MAX17644AATE+T 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 enables selection among forced PWM, PFM (pulse-skipping), or DCM (discontinuous conduction) modes - directly affecting light-load efficiency and output ripple behavior.
It integrates a 5V LDO (VCC) powered from VIN or optionally from EXTVCC (≥4.7V), reducing internal losses at higher input voltages. The device supports prebiased startup, monotonic soft-start via external capacitor on SS, and open-drain RESET monitoring with 92–95% output voltage window and 1024-cycle delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports wide industrial and automotive supply rails without external pre-regulation. |
| Output Voltage | Fixed 3.3V - factory-trimmed; no external feedback resistors required for nominal operation. |
| Max Output Current | 2.7A continuous - sustained across –40°C to +125°C ambient, enabling robust point-of-load delivery. |
| Regulation Accuracy | ±1.2% over –40°C to +125°C - ensures stable rail integrity in harsh thermal environments. |
| Switching Frequency | 400kHz to 2.2MHz (programmable via RT resistor) - allows trade-off between size (higher fSW → smaller inductor/capacitor) and EMI/efficiency. |
| Package | 16-pin TQFN (3mm × 3mm, 0.5mm pitch) - thermally enhanced with exposed pad; compatible with standard reflow profiles. |
| Shutdown Current | 2.8μA - enables ultra-low-power system standby states without external disconnect circuitry. |
Pinout & Package
Package: 16-pin TQFN (3mm × 3mm), RoHS-compliant, with exposed thermal pad (EP) connected to SGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN/UVLO | Enable / Input UVLO Threshold Input | Active-high enable; resistor-divider from VIN sets turn-on threshold (1.215V typ); pull low to disable. |
| 2 VCC | Internal 5V LDO Output | Powers internal logic and low-side driver; bypassed with 2.2μF ceramic to SGND; not for external loading. |
| 3 SGND | Signal Ground Reference | Reference node for FB, MODE/SYNC, SS, RT, RESET; must be separated from PGND in layout. |
| 4 MODE/SYNC | Control Mode Selection / External Clock 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; supports monotonic startup into prebiased outputs. |
| 6 FB | Feedback Input (3.3V Fixed) | Connected directly to VOUT for MAX17644A; internal reference = 3.3V ±1.2%; no external divider needed. |
| 7 RT | Switching Frequency Programming | Resistor to SGND sets fSW (400kHz–2.2MHz); unconnected = default 400kHz. |
| 8 RESET | Open-Drain Power-Good Output | Asserts low when FB < 92% of 3.3V (≈3.04V); deasserts 1024 cycles after FB > 95% (≈3.14V); requires external pull-up. |
| 9 EXTVCC | External Auxiliary Supply Input | Connect to 5V output to power VCC internally and improve efficiency; tie to SGND if unused. |
| 10 BST | Bootstrap Capacitor Terminal | 0.1μF ceramic capacitor between BST and LX supplies gate drive for high-side MOSFET. |
| 11–12 LX | Switching Node Outputs | High-current connection to inductor; dual pins reduce parasitic inductance and improve thermal performance. |
| 13–14 PGND | Power Ground Terminals | Low-impedance return path for high di/dt currents; connect to thermal pad and external ground plane. |
| 15–16 VIN | Input Power Supply Inputs | 4.5V–36V main input; decoupled with 2.2μF ceramic close to pins; dual pins reduce IR drop. |
| EP | Exposed Thermal Pad | Must be soldered to SGND plane with ≥6 thermal vias for θJA = 33°C/W; critical for thermal reliability at full load. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFET Integration | Eliminates need for external Schottky diode and reduces conduction losses - enables >95% peak efficiency. |
| Internal Compensation | Removes requirement for external Type-II/III compensation network - simplifies design and improves stability across 3.3V output range. |
| Hiccup-Mode Overcurrent Protection | Triggers 32,768-cycle shutdown on runaway current (>4.7A) or FB fault - limits power dissipation during short-circuit events. |
| Adjustable Light-Load Efficiency Modes | PFM/DCM/PWM selectable via MODE/SYNC - achieves <50μA quiescent current in PFM while maintaining regulation. |
| Prebiased Output Startup | Prevents reverse current flow into powered VOUT - essential for hot-swap and multi-rail sequencing applications. |
Applications
| Industrial Control Power Supplies | General-Purpose Point-of-Load |
|---|---|
Use Scenario: Powering PLC I/O modules, sensor interfaces, and fieldbus transceivers in factory automation cabinets with 24V DC bus. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator delivering clean, regulated power to microcontrollers and digital isolators. Use Value: Wide 4.5V–36V input accommodates brownout and surge conditions; ±1.2% regulation maintains logic-level integrity across temperature extremes. | Use Scenario: Local regulation for FPGA core or memory I/O rails on high-density compute boards where space is constrained. IC Role / Device Role / Timing Role: Compact, self-contained step-down converter replacing discrete controller + external MOSFET solutions. Use Value: 3mm × 3mm TQFN footprint and all-ceramic capacitor support minimize PCB area; 2.2MHz capability enables sub-2mm inductors. |
| Distributed Supply Regulation | Base Station Power Supplies |
Use Scenario: Secondary regulation stage downstream of intermediate bus converters in telecom equipment racks. IC Role / Device Role / Timing Role: Efficient 3.3V conversion from 12V or 48V intermediate bus, supporting dynamic load steps up to 2.7A. Use Value: Fast transient response enabled by peak-current mode control and low minimum on-time (52ns); hiccup protection prevents cascade failures. | Use Scenario: Powering RF front-end bias circuits, ADC/DAC references, and control logic in 4G/5G macro base stations. IC Role / Device Role / Timing Role: High-reliability 3.3V supply meeting CISPR32 Class B EMI requirements in dense RF environments. Use Value: Programmable frequency avoids sensitive RF bands; EXTVCC option improves efficiency at high VIN; -40°C to +125°C rating ensures outdoor deployment. |
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 |
|---|---|---|---|
| LM61480RQR | Fixed 3.3V output, 4.5V–36V input, 3.5A rating, 2.1MHz max fSW; requires external compensation; no EXTVCC pin. | Higher current capability but larger solution size due to external compensation and larger package (16-pin WQFN, 3.5mm × 3.5mm). | Select LM61480RQR only when >2.7A output or tighter transient response is required; MAX17644AATE+T preferred for minimal BOM count and thermal performance. |
| TPS543320RHLR | Adjustable output (0.6V–5.5V), 4.5V–18V input, 3A rating, 1.8MHz max fSW; includes PMBus interface; no hiccup mode. | Targeted at digitally controlled systems; lacks fixed 3.3V variant and hiccup protection - unsuitable for unmanaged overload scenarios. | Choose TPS543320RHLR for telemetry-enabled designs; MAX17644AATE+T remains optimal for analog-controlled, cost-sensitive, or safety-critical industrial use. |
Compared with LM61480RQR and TPS543320RHLR, the MAX17644AATE+T delivers superior integration (no external compensation), lower thermal resistance (33°C/W vs. ≥40°C/W), and dedicated hiccup-mode protection - making it the most robust choice for fixed 3.3V industrial point-of-load applications where reliability and board space are prioritized over programmability or peak current headroom.
Availability
MAX17644AATE+T is available at Aetrix Electronics and suitable for industrial control power supplies, general-purpose point-of-load regulation, distributed supply regulation, and base station power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX17644AATE+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 markets.
The MAX17644 series belongs to the Himalaya power portfolio, engineered specifically for high-efficiency, small-footprint, and thermally robust DC-DC conversion in harsh industrial environments - emphasizing simplicity, reliability, and reduced external component count.
FAQ
What is the output voltage tolerance of the MAX17644AATE+T over temperature?
The MAX17644AATE+T guarantees ±1.2% output voltage regulation accuracy over the full operating temperature range of –40°C to +125°C ambient. This specification applies to the fixed 3.3V output and is measured at the FB pin under load conditions per the datasheet test setup. The MAX17644AATE+T achieves this using factory-trimmed internal reference and built-in compensation, eliminating drift contributors from external resistor networks.
Does the MAX17644AATE+T require external compensation components?
No, the MAX17644AATE+T does not require external compensation components. Its internal compensation network is fully integrated and optimized for the fixed 3.3V output configuration across the entire input voltage (4.5V–36V) and load (0–2.7A) range. This eliminates the need for external Type-II or Type-III compensation networks, reducing BOM count, PCB area, and design validation effort - a key differentiator of the Himalaya series.
Can the MAX17644AATE+T operate with a prebiased output voltage?
Yes, the MAX17644AATE+T supports monotonic startup into a prebiased output. During initial enable, both high-side and low-side MOSFETs remain off until the internal PWM comparator commands the first pulse, preventing reverse current flow from the precharged output rail. This feature is essential for hot-swap applications and multi-rail sequencing where downstream circuitry may already be powered before the MAX17644AATE+T is enabled.
What protection features are included in the MAX17644AATE+T?
The MAX17644AATE+T integrates hiccup-mode overcurrent protection (triggered at 4.7A runaway current or FB fault), thermal shutdown (+165°C trip with 10°C hysteresis), adjustable EN/UVLO, open-drain RESET with 92–95% output monitoring, and EXTVCC switchover for improved efficiency. These protections operate autonomously without external circuitry, ensuring safe operation under overload, short-circuit, overtemperature, and input brownout conditions - critical for unattended industrial deployments.
Is the MAX17644AATE+T pin-compatible with other variants in the MAX17644 family?
Yes, the MAX17644AATE+T shares identical pinout, package (16-pin TQFN), and footprint with the MAX17644BATE+T (5V fixed) and MAX17644CATE+T (adjustable). All three variants use the same PCB layout, allowing design reuse across output voltage requirements. However, FB connections differ: MAX17644AATE+T connects FB directly to VOUT, while MAX17644CATE+T requires an external resistor divider - so schematic changes are needed despite mechanical compatibility.
MAX17644AATE+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)
MAX17644AATE+T FAQ
1.How can I place an order for MAX17644AATE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17644AATE+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 MAX17644AATE+T reliable?
The price and inventory of MAX17644AATE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17644AATE+T is usually 5 days.
3.What payment methods are accepted for MAX17644AATE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17644AATE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17644AATE+T?
MAX17644AATE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17644AATE+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 MAX17644AATE+T?
For technical support, including MAX17644AATE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17644AATE+T requirements.
6.How does Aetrix verify that MAX17644AATE+T is sourced from the original manufacturer or authorized distributors?
All MAX17644AATE+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 MAX17644AATE+T meets industry standards.
7.What is the process for return or replacement of MAX17644AATE+T?
All MAX17644AATE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17644AATE+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 MAX17644AATE+T part is unused and in its original packaging.
Return procedure for MAX17644AATE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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