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Analog Devices Inc./Maxim Integrated MAX17243ETPA+
- Part No.:
- MAX17243ETPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX17243ETPA+.pdf
- Description:
- IC REG BUCK ADJ/1V 3A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:490
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Product details
Overview
The MAX17243ETPA+ from Maxim Integrated is a 3A synchronous step-down DC-DC converter with integrated MOSFETs, operating from 3.5V to 36V input and delivering fixed 3.3V/5V or adjustable 1V–10V output. It features 93% peak efficiency, 15µA quiescent current in standby, and 2.2MHz switching frequency with spread-spectrum EMI reduction-used in industrial power supplies and point-of-load regulation.
For engineers reviewing the MAX17243ETPA+ datasheet, MAX17243ETPA+ pinout, MAX17243ETPA+ application, or MAX17243ETPA+ equivalent, key selection criteria include its 3A output capability, 99% dropout duty cycle, PGOOD signaling, dual-mode (PWM/PFM) operation, and TQFN-20 package thermal performance for high-density board layouts.
Technical Context
The MAX17243ETPA+ uses current-mode control with internal high-side (60–140mΩ) and low-side (35–70mΩ) MOSFETs, enabling stable regulation across 3.5V–36V input while maintaining 95% output voltage accuracy via 1.00V ±1% FB reference. Its dual-mode operation-forced PWM for EMI-sensitive systems or PFM for ultra-low-light-load efficiency-is selected via FSYNC pin logic level.
Thermal protection triggers at 175°C with 15°C hysteresis, and overvoltage protection activates at 107% of FB setpoint. The BIAS linear regulator (4.7–5.4V) powers internal circuitry, while the exposed-pad TQFN-20 package achieves θJA = 30°C/W on a four-layer board per JEDEC JESD51-7.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous-supports compact 3A PoL designs without external MOSFETs or heat sinks. |
| Input Voltage Range | 3.5V to 36V-enables direct connection to 12V/24V industrial rails and tolerates 42V transients. |
| Switching Frequency | 220kHz to 2.2MHz, resistor-programmable-allows optimization of inductor size vs. efficiency trade-offs. |
| Quiescent Current | 15µA typical in standby-extends battery life in always-on IoT sensors and remote monitoring nodes. |
| Efficiency | 93% peak at 3A/5V out-reduces thermal load in sealed enclosures and eliminates need for airflow-dependent cooling. |
| FB Reference Voltage | 1.00V ±1%-ensures ±1% output accuracy when using external resistor divider for 1V–10V adjustment. |
| Duty Cycle Max | 99%-maintains regulation during severe input undervoltage events (e.g., automotive cold-crank). |
Pinout & Package
The MAX17243ETPA+ is housed in a 5mm × 5mm, 20-pin TQFN package with exposed thermal pad (EP), rated for –40°C to +85°C ambient operation and optimized for PCB-level thermal dissipation via EP-to-PGND copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FOSC | Frequency setting input | Connects to AGND via resistor (e.g., 12kΩ for 2.2MHz); sets switching frequency with ±3% spread-spectrum modulation when enabled. |
| OUT | Power output node | Delivers regulated DC output; also powers internal circuitry in 3V–5V fixed-output configurations during standby. |
| FB | Feedback sensing input | Monitors output via resistive divider; tied to BIAS for 3.3V/5V fixed outputs or configured for 1V–10V adjustment. |
| COMP | Error amplifier output | Accepts RC compensation network (RC/CC) to stabilize loop with ceramic output capacitors. |
| BIAS | Internal LDO output | 5V ±0.3V supply for internal logic; requires ≥2.2µF ceramic bypass to AGND for stability. |
| EN | Enable control input | 42V-tolerant logic input; high enables regulation, low forces shutdown with <5µA supply current. |
| SUPSW | High-side switch supply | Separate 3.5V–36V input powering gate drivers; bypassed with 0.1µF + 4.7µF ceramics to PGND. |
| SUP | Main supply input | 3.5V–36V input powering bias regulator; bypassed with 2.2µF ceramic to PGND. |
| PGOOD | Open-drain status output | Asserts high when VOUT > 95% of regulation; deasserts at 92.5%; used for power sequencing and fault reporting. |
| SPS | Spread-spectrum enable | Pull high to enable ±3% frequency dithering; pull low to disable-reduces EMI peaks without external components. |
| FSYNC | External clock sync input | Connect to BIAS or external clock for forced-PWM; connect to AGND for PFM mode-selects control scheme dynamically. |
| LX (16–18) | Switching node | Three parallel pins for high-current inductor connection; minimizes trace inductance and thermal resistance. |
| PGND (13–14) | Power ground return | Dedicated low-impedance path for high-frequency switch currents; separate from AGND to reduce noise coupling. |
| AGND (6) | Analog ground reference | Reference for FB, COMP, and internal error amplifier; must be connected to PGND at single point near EP. |
| BST (15) | Bootstrap supply | Connects 0.1µF capacitor between BST and LX to drive high-side MOSFET gate above input rail. |
| N.C. (19) | No connection | Unbonded pin-must remain unconnected and unpopulated on PCB. |
| EP | Exposed thermal pad | Must be soldered to large contiguous copper pour tied to PGND; primary thermal path for 2.67W max dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| All-ceramic capacitor solution | Enables ultra-compact layout with as few as eight external components-no electrolytics required for input/output filtering. |
| Pin-compatible 2A/3A variants | MAX17242 (2A) and MAX17243 (3A) share identical pinout and footprint-simplifies design reuse and BOM scaling. |
| Programmable soft-start | Fixed 8ms internal soft-start reduces inrush current during power-up-prevents input rail collapse in multi-rail systems. |
| 42V transient protection | Withstands 42V input transients for ≤1s-eliminates need for external TVS diodes in automotive and industrial 24V applications. |
| Cycle-by-cycle current limit | Hardware-based overcurrent protection limits LX current to 3.75–6.25A-prevents damage during short-circuit or overload events. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Powering microcontrollers, CAN transceivers, and sensor interfaces in motor drive control boards with 24V bus input. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator delivering 3A to mixed-signal subsystems under variable load and temperature. Use Value: 93% peak efficiency and 15µA standby current extend thermal margin and reduce system power loss in enclosed cabinets. | Use Scenario: Regulating 3.3V for infotainment SoCs and 5V for LIN transceivers in body control units exposed to automotive cold-crank (4.5V) and load-dump (42V) events. IC Role / Device Role / Timing Role: Input-tolerant buck converter providing stable output despite wide VIN swings and EMI-sensitive environments. Use Value: 99% duty cycle operation maintains regulation during cold-crank; spread-spectrum mode reduces radiated emissions below CISPR 25 Class 5 limits. |
| Smart Building Sensors | Industrial PLC I/O Modules |
Use Scenario: Powering wireless sensor nodes (BLE/Zigbee) and analog front-ends in battery-backed or energy-harvested smart building nodes. IC Role / Device Role / Timing Role: Low-quiescent-current DC-DC converter enabling multi-year battery life while supporting burst-mode RF transmission loads. Use Value: 15µA standby current and PFM mode efficiency >85% at 1mA load maximize usable energy from coin-cell or supercapacitor sources. | Use Scenario: Generating isolated 5V/3.3V rails for digital I/O conditioning circuits in programmable logic controllers with 24V field-side inputs. IC Role / Device Role / Timing Role: Robust, high-reliability buck stage supplying FPGA configuration, ADC references, and optocoupler drivers. Use Value: Thermal shutdown with automatic recovery and cycle-by-cycle current limiting ensure uninterrupted operation during field-wiring faults or surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQR | 3.5V–36V input, 4A output, 1.5MHz fixed frequency, no PFM mode, 12µA IQ | Higher output current but lacks PFM light-load efficiency and spread-spectrum EMI reduction | Select LM61480RQR only if 4A output and fixed-frequency simplicity outweigh need for ultra-low-IQ and EMI mitigation. |
| TPS543320RHLR | 4.5V–18V input, 3A output, 2.2MHz, PMBus interface, 15µA IQ, no spread spectrum | Narrower input range; adds digital configurability but increases BOM cost and layout complexity | Choose TPS543320RHLR when telemetry, dynamic voltage scaling, or tight input voltage constraints justify added firmware overhead. |
Compared with LM61480RQR and TPS543320RHLR, the MAX17243ETPA+ uniquely combines 36V input tolerance, PFM efficiency below 1mA, hardware-based spread-spectrum EMI control, and pin compatibility with the 2A MAX17242-making it optimal for ruggedized, low-noise, thermally constrained industrial and automotive PoL designs.
Availability
The MAX17243ETPA+ is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, smart building sensors, and industrial PLC I/O modules requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX17243ETPA+ 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, and communications applications.
The MAX17242/MAX17243 family targets high-efficiency, low-quiescent-current DC-DC conversion in space-constrained systems where input voltage resilience, EMI control, and thermal reliability are critical.
FAQ
What is the maximum output current capability of the MAX17243ETPA+?
The MAX17243ETPA+ delivers up to 3A continuous output current under thermal-limited conditions with proper PCB layout and heatsinking. Its LX current limit is specified from 3.75A to 6.25A, ensuring robust overload handling. This 3A rating applies across the full –40°C to +85°C operating temperature range when using the recommended 5mm × 5mm TQFN package with exposed pad soldered to a sufficient copper area.
Does the MAX17243ETPA+ support both fixed and adjustable output voltages?
Yes, the MAX17243ETPA+ supports both configurations: connect FB directly to BIAS for factory-trimmed 3.3V or 5V fixed outputs (±2% accuracy), or use an external resistor divider from OUT to FB to AGND for adjustable outputs from 1V to 10V (±1% FB reference accuracy). The FB pin has a precise 1.00V ±1% internal reference, enabling accurate custom voltage settings without trimming.
How does the MAX17243ETPA+ achieve low EMI performance?
The MAX17243ETPA+ reduces EMI through hardware-enabled spread-spectrum frequency modulation (±3% around FOSC) controlled by the SPS pin, plus optimized internal gate drivers and layout-aware pin assignment (e.g., triple LX pins, separated PGND/AGND). When SPS is high, the internal oscillator modulates triangularly at 110μs period (at 2.2MHz), spreading energy across a band rather than concentrating at a single fundamental frequency.
What is the purpose of the separate SUP and SUPSW pins on the MAX17243ETPA+?
The MAX17243ETPA+ uses separate SUP (bias regulator input) and SUPSW (high-side switch supply) pins to independently optimize efficiency and transient response. SUP powers the internal 5V BIAS LDO, while SUPSW directly supplies the gate drivers and high-side MOSFET. This separation allows each rail to be bypassed with appropriate capacitors (2.2µF for SUP, 0.1µF + 4.7µF for SUPSW), minimizing coupling and improving stability under fast load steps.
Can the MAX17243ETPA+ operate during input voltage dropouts?
Yes, the MAX17243ETPA+ supports dropout operation up to 99% duty cycle, maintaining regulation when input voltage falls near the output voltage. It detects minimum off-time (100ns) and forces low-side FET conduction every 12µs to sustain high-duty-cycle operation-critical for automotive cold-crank (down to ~4.5V) and industrial brownout scenarios where input may dip below nominal levels.
MAX17243ETPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (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:
- 3A
- Frequency - Switching:
- 220kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX17243ETPA+ FAQ
1.How can I place an order for MAX17243ETPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17243ETPA+ 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 MAX17243ETPA+ reliable?
The price and inventory of MAX17243ETPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17243ETPA+ is usually 5 days.
3.What payment methods are accepted for MAX17243ETPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17243ETPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17243ETPA+?
MAX17243ETPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17243ETPA+ 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 MAX17243ETPA+?
For technical support, including MAX17243ETPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17243ETPA+ requirements.
6.How does Aetrix verify that MAX17243ETPA+ is sourced from the original manufacturer or authorized distributors?
All MAX17243ETPA+ 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 MAX17243ETPA+ meets industry standards.
7.What is the process for return or replacement of MAX17243ETPA+?
All MAX17243ETPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17243ETPA+, 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 MAX17243ETPA+ part is unused and in its original packaging.
Return procedure for MAX17243ETPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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