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Analog Devices Inc./Maxim Integrated MAX17244ETERA+
- Part No.:
- MAX17244ETERA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX17244ETERA+.pdf
- Description:
- IC REG BCK PROG/1V 2.5A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,110
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Product details
Overview
The MAX17244ETERA+ from Maxim Integrated is a 2.5A synchronous step-down DC-DC converter with integrated high-side and low-side MOSFETs, operating from 3.5V to 36V input with 42V transient protection. It delivers fixed 3.3V/5V outputs or adjustable 1V–10V outputs, supports 220kHz–2.2MHz switching frequency, and achieves >90% peak efficiency in automotive and industrial point-of-load regulation.
For engineers reviewing the MAX17244ETERA+ datasheet, MAX17244ETERA+ pinout, MAX17244ETERA+ application, or MAX17244ETERA+ equivalent, key selection factors include its 28µA quiescent current, PFM/PWM mode selectability via FSYNC, 98% max duty cycle for dropout operation, spread-spectrum EMI reduction, and dual-package availability (TQFN-16/TSSOP-16) with exposed thermal pad.
Technical Context
The MAX17244ETERA+ uses current-mode control with selectable PWM or PFM operation: PWM ensures constant switching frequency across all loads, while PFM disables negative inductor current and skips pulses at light loads to maximize efficiency. Its internal 5V BIAS LDO powers circuitry until output regulation is achieved, then transitions to OUT-supplied bias for reduced losses.
It features automatic LX slew-rate adjustment (4ns at >1.1MHz, 8ns at <1.1MHz), 180° out-of-phase SYNCOUT for cascaded supplies, cycle-by-cycle current limiting, thermal shutdown with 15°C hysteresis, and overvoltage protection triggered at 105% VFB. The FSYNC pin selects mode-AGND enables PFM; BIAS or external clock enables forced-PWM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports wide-range industrial and automotive inputs; withstands 42V transients for robust cold-crank operation. |
| Output Current | 2.5A continuous - sufficient for mid-power microcontrollers, sensors, and RF modules without external heatsinking. |
| Output Voltage Options | Fixed 3.3V/5V (±2%) or adjustable 1V–10V - enables flexible rail generation with single-resistor feedback network. |
| Quiescent Current | 28µA typical - minimizes standby power loss in battery-backed or always-on systems. |
| Switching Frequency | 220kHz–2.2MHz (resistor-programmable) - allows optimization of inductor size, efficiency, and EMI profile per design constraints. |
| Efficiency | >90% peak - achieved via synchronous rectification, low RDS(on) MOSFETs (100mΩ HS / 1.5Ω LS), and ceramic-capacitor compatibility. |
| Duty Cycle Max | 98% - enables ultra-low dropout operation during undervoltage events (e.g., engine cranking). |
Pinout & Package
MAX17244ETERA+ is available in two thermally enhanced packages: 5mm × 5mm TQFN-16 with exposed pad (θJA = 35°C/W), and 16-pin TSSOP (θJA = 38.3°C/W). Both support -40°C to +85°C ambient operation and require EP connected to PGND for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable Input | High-voltage compatible (up to 42V) logic enable; connects directly to automotive KL30 or CAN transceiver INH pin. |
| FSYNC | Mode Control & Sync Input | Selects PFM (AGND) or forced-PWM (BIAS/external clock); synchronizes switching to external source within one cycle. |
| FOSC | Frequency Set Input | Resistor-to-AGND sets fSW from 220kHz to 2.2MHz; enables precise EMI tuning and inductor sizing. |
| FB | Feedback Input | Monitors output via resistive divider; regulates to 1.0V reference (±1%) for ±2% output accuracy at 3.3V/5V. |
| PGOOD | Open-Drain Power-Good | Asserts high when VOUT ≥ 95% VFB; deasserts at ≤92% - simplifies power sequencing in multi-rail systems. |
| LX | Switch Node | Connects to inductor and Schottky diode cathode; requires 0.1µF BST capacitor to LX for gate drive integrity. |
| SUP / SUPSW | Dual Supply Inputs | SUP powers internal LDO; SUPSW powers high-side switch - decoupled inputs improve noise immunity and transient response. |
| SYNCOUT | 180° Out-of-Phase Clock | Enables phase interleaving with second MAX17244ETERA+ to double output current or reduce input ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated High/Low-Side MOSFETs | Eliminates external switches and reduces BOM count; 100mΩ HS RDS(on) and 1.5Ω LS RDS(on) enable >90% efficiency at full load. |
| All-Ceramic Capacitor Support | Enables ultra-compact layout with no electrolytic capacitors - improves reliability and lifetime in harsh environments. |
| Spread-Spectrum EMI Reduction | Factory-enabled ±6% frequency modulation centered on fSW - lowers peak EMI emissions without external filtering. |
| Automatic LX Slew-Rate Adjustment | Optimizes gate drive rise time (4ns at >1.1MHz, 8ns at <1.1MHz) to balance EMI suppression and switching loss. |
| Power-Good & 180° SYNCOUT | PGOOD simplifies system power sequencing; SYNCOUT enables phase-shifted parallel operation for higher current or lower ripple. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering DSPs, display controllers, and audio codecs in head units with 12V/24V battery input and strict EMI limits. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator with forced-PWM mode enabled via FSYNC to suppress switching frequency variation near RF receivers. Use Value: 28µA quiescent current extends battery life in accessory-mode operation; 42V transient tolerance prevents reset during load-dump events. | Use Scenario: Generating isolated 3.3V rails for digital I/O logic and sensor interfaces in programmable logic controllers. IC Role / Device Role / Timing Role: Synchronous buck converter delivering stable 3.3V at 2.5A with PGOOD signaling to FPGA configuration sequencer. Use Value: Fixed 3.3V output with ±2% accuracy ensures reliable logic-level compliance; TQFN package enables compact PCB layout in space-constrained DIN-rail enclosures. |
| RF Transceiver Power Supply | Smart Building Sensor Hub |
Use Scenario: Providing clean, low-noise 5V supply to LTE/Wi-Fi transceivers where spectral purity and emission control are critical. IC Role / Device Role / Timing Role: EMI-optimized buck regulator operating in fixed-frequency FPWM mode with spread-spectrum enabled to meet CISPR-22 Class B limits. Use Value: 2.2MHz switching frequency minimizes filter component size; SYNCOUT allows interleaving with secondary rail to cancel input ripple. | Use Scenario: Powering multi-sensor nodes (temperature, humidity, CO₂) with long-life battery or energy-harvesting sources. IC Role / Device Role / Timing Role: Ultra-low-quiescent-current buck converter operating in PFM mode during sleep cycles to extend operational lifetime. Use Value: 5µA shutdown current and 28µA standby draw minimize parasitic drain; 98% duty cycle sustains regulation during brownout conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQWR | 4.5V–36V input, 8A output, 2.1MHz fixed fSW, no PFM mode, 15µA IQ | Higher current capacity but lacks PFM light-load optimization and 180° SYNCOUT | Choose LM61480RQWR for higher-output-current designs requiring minimal external components and tighter thermal specs. |
| TPS54240DGQR | 3.5V–42V input, 2.5A output, 100kHz–2.5MHz adjustable fSW, 110µA IQ, no spread spectrum | Wider input range and higher max fSW, but significantly higher quiescent current and no EMI-reduction features | Choose TPS54240DGQR when 42V absolute max input rating is mandatory and EMI is less critical than cost. |
Compared with LM61480RQWR and TPS54240DGQR, the MAX17244ETERA+ uniquely combines ultra-low 28µA quiescent current, PFM/PWM mode flexibility, built-in spread-spectrum EMI reduction, and 180° SYNCOUT for interleaved operation-making it optimal for space-, noise-, and power-constrained embedded systems.
Availability
MAX17244ETERA+ is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and RF transceiver power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX17244ETERA+ 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 demanding industrial, automotive, and communications applications.
The MAX17244ETERA+ belongs to Maxim's high-efficiency synchronous buck converter product line, engineered specifically for wide-input industrial and automotive power supplies where low IQ, EMI control, and transient robustness are critical.
FAQ
What is the maximum input voltage transient rating for the MAX17244ETERA+?
The MAX17244ETERA+ is rated for 42V input voltage transients, protecting against load-dump events in automotive 12V/24V systems. This rating applies for transients under 1 second duration and is self-protected without external clamping components, ensuring reliable operation during engine cranking or alternator regulation faults.
How does the MAX17244ETERA+ achieve ultra-low quiescent current?
The MAX17244ETERA+ achieves 28µA typical quiescent current through optimized bias circuitry, adaptive gate drive, and intelligent power-state management. In standby mode, non-essential blocks are powered down while maintaining fast wake-up capability. Shutdown current drops further to 5µA when EN is pulled low, making MAX17244ETERA+ ideal for battery-powered applications.
Can the MAX17244ETERA+ operate in dropout condition, and what is its maximum duty cycle?
Yes, the MAX17244ETERA+ operates in dropout by running at up to 98% duty cycle, enabling regulation even when input voltage approaches output voltage. This behavior is critical for automotive cold-crank scenarios where battery voltage may dip below nominal levels. The device monitors off-time continuously and forces low-side conduction to sustain regulation without external intervention.
What is the purpose of the SYNCOUT pin on the MAX17244ETERA+?
The SYNCOUT pin on the MAX17244ETERA+ provides an open-drain 180° out-of-phase clock signal relative to the internal oscillator. It enables phase-interleaved operation with a second MAX17244ETERA+ to reduce input/output ripple, increase total output current, and improve thermal distribution-without requiring external timing controllers or complex synchronization circuitry.
Does the MAX17244ETERA+ support adjustable output voltage, and how is it configured?
Yes, the MAX17244ETERA+ supports adjustable output voltage from 1V to 10V using an external resistive divider from OUT to FB to AGND. For fixed 5V or 3.3V outputs, connect FB directly to BIAS. The feedback reference is precisely 1.0V (±1%), enabling ±2% output accuracy across temperature and line variations for both fixed and adjustable configurations.
MAX17244ETERA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Strip
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V (3.3V)
- Voltage - Output (Max):
- 10V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 400kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (5x5)
MAX17244ETERA+ FAQ
1.How can I place an order for MAX17244ETERA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17244ETERA+ 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 MAX17244ETERA+ reliable?
The price and inventory of MAX17244ETERA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17244ETERA+ is usually 5 days.
3.What payment methods are accepted for MAX17244ETERA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17244ETERA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17244ETERA+?
MAX17244ETERA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17244ETERA+ 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 MAX17244ETERA+?
For technical support, including MAX17244ETERA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17244ETERA+ requirements.
6.How does Aetrix verify that MAX17244ETERA+ is sourced from the original manufacturer or authorized distributors?
All MAX17244ETERA+ 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 MAX17244ETERA+ meets industry standards.
7.What is the process for return or replacement of MAX17244ETERA+?
All MAX17244ETERA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17244ETERA+, 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 MAX17244ETERA+ part is unused and in its original packaging.
Return procedure for MAX17244ETERA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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