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Analog Devices Inc./Maxim Integrated MAX17243ETPB+
- Part No.:
- MAX17243ETPB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX17243ETPB+.pdf
- Description:
- IC REG BUCK ADJ/1V 3A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,006
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Product details
Overview
MAX17243ETPB+ from Maxim Integrated is a 3.5V–36V input, 3A synchronous step-down DC-DC converter with integrated high-side and low-side MOSFETs, fixed 5V/3.3V or adjustable 1V–10V output, 220kHz–2.2MHz resistor-programmable switching frequency, and 93% peak efficiency - used in distributed power regulation for industrial control systems.
For engineers reviewing the MAX17243ETPB+ datasheet, MAX17243ETPB+ pinout, MAX17243ETPB+ application, or MAX17243ETPB+ equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and EMI-reduction features, and real-world selection guidance for high-input-voltage buck conversion in space-constrained designs.
Technical Context
The MAX17243ETPB+ employs current-mode control with selectable PWM or PFM operation: PWM ensures constant-frequency switching across all loads (critical for EMI-sensitive systems), while PFM disables negative inductor current and skips pulses at light loads to achieve ultra-low quiescent current (15µA typ). Its dual-supply architecture separates SUP (bias regulator input) and SUPSW (switch driver input), enabling robust operation during 42V transients and dropout conditions up to 99% duty cycle.
It integrates a 5V BIAS linear regulator (±2% accuracy), open-drain PGOOD with 92.5–95% VFB thresholds, spread-spectrum modulation (±3% frequency dithering), and cycle-by-cycle current limiting with thermal shutdown (175°C trip, 15°C hysteresis). The FSYNC pin selects synchronization mode or enables PFM, and SPS controls spread-spectrum activation independently of clock source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports wide industrial input rails and tolerates 42V transients without damage. |
| Output Current | 3A continuous - validated for full-load operation with integrated 60mΩ high-side and 35mΩ low-side MOSFETs. |
| Output Voltage Options | Fixed 3.3V/5V (±2%) or adjustable 1V–10V (±1% FB accuracy) - enables single-BOM flexibility across multiple voltage rails. |
| Switching Frequency | 220kHz–2.2MHz, resistor-programmable or externally synchronized - allows optimization of size (higher fSW → smaller L/C) vs. efficiency (lower fSW → reduced switching loss). |
| Quiescent Current | 15µA typical in standby, <5µA in shutdown - extends battery life in always-on or low-power IoT nodes. |
| Efficiency | 93% peak at 3A/5V/14VIN/2.2MHz - achieved via synchronous rectification and low-RDS(on) integrated FETs. |
| Thermal Protection | 175°C junction shutdown with 15°C hysteresis and automatic recovery - ensures safe operation under sustained overload or poor PCB heatsinking. |
Pinout & Package
MAX17243ETPB+ is housed in a 20-pin, 5mm × 5mm TQFN package with exposed pad (EP), rated for –40°C to +85°C ambient operation and optimized for thermal dissipation (θJA = 30°C/W, θJC = 2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FOSC | Frequency setting input | Connects to AGND via resistor (e.g., 12kΩ for 2.2MHz); sets internal oscillator frequency with ±3% spread-spectrum capability when enabled. |
| OUT | Regulated output node | Delivers up to 3A; powers internal circuitry in standby when VOUT ≥ 3V; connects to external LC filter and load. |
| FB | Feedback sensing input | Monitors output via resistive divider (1V reference); determines regulation accuracy (±1% FB tolerance) and enables 1V–10V programmability. |
| COMP | Error amplifier output | Accepts RC compensation network (RC/CC) to stabilize loop with ceramic output capacitors; supports high-bandwidth current-mode control. |
| BIAS | Integrated 5V LDO output | Powers internal analog blocks; requires ≥2.2µF ceramic bypass to AGND; regulates to 4.7–5.4V over load/temperature. |
| EN | Enable control input | 42V-tolerant logic input; high = active, low = shutdown (<5µA ISHDN); includes 0.2V hysteresis for clean UVLO behavior. |
| SUPSW | High-side switch supply | Separate input for gate driver; bypassed with 0.1µF + 4.7µF ceramics to PGND; enables robust switching under input sag. |
| SUP | Main supply input | Powers internal bias regulator; bypassed with 2.2µF ceramic to PGND; shares 3.5–36V range with SUPSW but serves different internal domains. |
| PGOOD | Open-drain power-good flag | Asserts high when VOUT > 95% VFB, deasserts low at <92.5% VFB; debounced 25µs; simplifies power sequencing in multi-rail systems. |
| SPS | Spread-spectrum enable | Logic-high enables ±3% triangular dithering of fSW to reduce EMI peaks; disabled when pulled low or during external sync. |
| PGND / AGND | Power / analog ground | Separate ground pins minimize noise coupling; EP must connect to large copper plane tied to PGND for thermal performance. |
| LX (pins 16–18) | Switching node | Drives external inductor; three parallel pins reduce trace inductance and improve current sharing in high-current paths. |
| FSYNC | External clock sync input | Accepts 1.8–2.6MHz external clock; synchronizes within two cycles; defaults to PFM when tied to AGND. |
| N.C. | No connection | Pin 19 is unconnected internally; must remain floating or grounded per layout best practices - no signal routing. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck topology with integrated MOSFETs | Eliminates external Schottky diode and reduces BOM count by 2–4 components; enables >93% efficiency at full load without external FETs. |
| Resistor-programmable switching frequency (220kHz–2.2MHz) | Enables precise EMI filtering and inductor sizing - e.g., 12kΩ sets 2.2MHz for compact 2.2µH inductors in space-constrained applications. |
| 15µA standby quiescent current | Extends runtime in battery-backed systems (e.g., smart sensors) by reducing no-load power draw by >50% vs. legacy 30–50µA buck regulators. |
| 42V transient protection on SUP/SUPSW | Withstands automotive load-dump and industrial surge events without external TVS, simplifying front-end protection design. |
| 8ms internal soft-start | Prevents input inrush current spikes during power-up; eliminates need for external soft-start circuitry or timing capacitors. |
| Spread-spectrum modulation (±3% fSW) | Reduces peak EMI amplitude by spreading energy across a narrow band - meets CISPR-22 Class B conducted emission limits without added shielding. |
Applications
| Distributed Supply Regulation | Wall Transformer Regulation |
|---|---|
Use Scenario: Powering microcontrollers, sensors, and communication ICs from a shared 12V/24V bus in factory automation panels. IC Role / Device Role: Primary point-of-load regulator converting 24V rail to stable 3.3V/5V for digital subsystems. Use Value: High efficiency (93% at 3A) minimizes heat buildup in sealed enclosures; 36V max input accommodates brownout margins and line surges. |
Use Scenario: Replacing linear regulators in AC/DC wall adapters to improve efficiency and reduce thermal derating. IC Role / Device Role: Secondary-side synchronous buck delivering regulated 5V/3.3V from unregulated 9–18V DC output of flyback transformer. Use Value: 15µA quiescent current meets Energy Star Level VI standby requirements; PFM mode maintains >85% efficiency at 1mA load. |
| General-Purpose Point-of-Load | Industrial Control Module Power |
Use Scenario: Providing clean, low-noise 3.3V for ADCs, DACs, and precision op-amps in data acquisition systems. IC Role / Device Role: Local regulator placed near sensitive analog ICs to minimize IR drop and noise coupling. Use Value: Low 15µA IQ prevents self-heating drift; PGOOD enables system-level fault detection before analog signal corruption occurs. |
Use Scenario: Powering PLC I/O modules requiring reliable 5V/3.3V under harsh 42V transients and -40°C cold starts. IC Role / Device Role: Main DC-DC stage with integrated protection (thermal, OVP, current limit) and wide-temp operation. Use Value: 42V transient rating eliminates need for upstream TVS; -40°C to +85°C rating ensures uptime in outdoor cabinets and motor control environments. |
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 frequency; no PFM mode; higher IQ (26µA) | Better suited for high-current (>5A), fixed-frequency EMI-controlled systems; lacks light-load PFM efficiency boost. | Select LM61480RQWR only if >5A output or strict 2.1MHz synchronization is required; MAX17243ETPB+ preferred for 3A + ultra-low IQ + PFM flexibility. |
| TPS54332DDAR | 3.5V–28V input, 3A output, 570kHz–2.2MHz adjustable; no spread spectrum; 115µA IQ in skip mode | Lower input voltage ceiling (28V vs. 36V); higher quiescent current limits battery-life extension; no integrated 42V transient protection. | Choose TPS54332DDAR for cost-sensitive 24V-only systems where spread spectrum and 42V ruggedness are non-critical. |
Compared with LM61480RQWR and TPS54332DDAR, MAX17243ETPB+ uniquely combines 36V input, 3A output, 15µA standby current, PFM/PWM mode selectability, and ±3% spread-spectrum - making it optimal for industrial and battery-backed applications demanding efficiency, ruggedness, and EMI compliance in one compact TQFN.
Availability
MAX17243ETPB+ is available at Aetrix Electronics and suitable for distributed supply regulation, wall transformer replacement, and general-purpose point-of-load applications requiring stable component supply, long-term industrial lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX17243ETPB+ 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 high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX17242/MAX17243 product line targets high-input-voltage, low-quiescent-current DC-DC conversion in space-constrained industrial and IoT edge devices - emphasizing ruggedness, efficiency, and simplified layout.
FAQ
What is the maximum output current supported by the MAX17243ETPB+?
The MAX17243ETPB+ delivers up to 3A continuous output current, validated across its full operating temperature range (–40°C to +85°C) with integrated 60mΩ high-side and 35mΩ low-side MOSFETs. Peak inductor current limit is specified at 3.75A (min), 5A (typ), and 6.25A (max), ensuring robust overload handling without external current-sense components.
Does the MAX17243ETPB+ support both fixed and adjustable output voltages?
Yes, the MAX17243ETPB+ supports fixed 3.3V or 5V outputs (±2% accuracy) when FB is connected directly to BIAS, and adjustable 1V–10V outputs (±1% FB reference accuracy) using an external resistive divider from OUT to FB to AGND. The internal 1V feedback reference enables precise regulation across the full range.
How does the MAX17243ETPB+ achieve ultra-low quiescent current?
The MAX17243ETPB+ achieves 15µA typical quiescent current in standby mode through optimized bias circuitry and adaptive gate drive. In shutdown (EN = low), current drops to <5µA. This is enabled by internal power-domain gating and low-leakage process technology - critical for battery-powered applications where standby duration dominates total energy use.
Can the MAX17243ETPB+ operate during input voltage transients?
Yes, the MAX17243ETPB+ withstands 42V input transients on both SUP and SUPSW pins without damage, and operates down to 3.5V input while maintaining regulation via 99% maximum duty cycle. Its dual-supply architecture isolates bias and switch domains, allowing continued function during severe line sags common in automotive and industrial environments.
What package type and thermal characteristics does the MAX17243ETPB+ use?
The MAX17243ETPB+ uses a 20-pin, 5mm × 5mm TQFN package with exposed pad (EP), rated for –40°C to +85°C ambient. Its thermal resistance is θJA = 30°C/W (JEDEC JESD51-7, 4-layer board) and θJC = 2°C/W, enabling >2.6W continuous power dissipation at +70°C ambient with proper PCB copper area connected to EP and PGND.
MAX17243ETPB+ 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)
MAX17243ETPB+ FAQ
1.How can I place an order for MAX17243ETPB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17243ETPB+ 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 MAX17243ETPB+ reliable?
The price and inventory of MAX17243ETPB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17243ETPB+ is usually 5 days.
3.What payment methods are accepted for MAX17243ETPB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17243ETPB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17243ETPB+?
MAX17243ETPB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17243ETPB+ 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 MAX17243ETPB+?
For technical support, including MAX17243ETPB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17243ETPB+ requirements.
6.How does Aetrix verify that MAX17243ETPB+ is sourced from the original manufacturer or authorized distributors?
All MAX17243ETPB+ 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 MAX17243ETPB+ meets industry standards.
7.What is the process for return or replacement of MAX17243ETPB+?
All MAX17243ETPB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17243ETPB+, 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 MAX17243ETPB+ part is unused and in its original packaging.
Return procedure for MAX17243ETPB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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