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Analog Devices Inc./Maxim Integrated MAX17242ETPB+
- Part No.:
- MAX17242ETPB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX17242ETPB+.pdf
- Description:
- IC REG BUCK ADJ/1V 2A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,135
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Product details
Overview
MAX17242ETPB+ from Maxim Integrated is a high-efficiency, synchronous step-down DC-DC converter with integrated MOSFETs, delivering up to 2A output current across a 3.5V–36V input range and generating fixed 3.3V/5V or adjustable 1V–10V outputs. It features 15µA quiescent current in standby, 93% peak efficiency, and operates in PWM or PFM mode for optimized light-load performance-ideal for distributed supply regulation in industrial power systems.
For engineers reviewing the MAX17242ETPB+ datasheet, MAX17242ETPB+ pinout, MAX17242ETPB+ application, or MAX17242ETPB+ equivalent, key selection considerations include its 20-pin TQFN (5mm × 5mm) package, resistor-programmable 220kHz–2.2MHz switching frequency, ±1% FB accuracy for adjustable outputs, 42V transient protection, and integrated PGOOD for robust power sequencing.
Technical Context
The MAX17242ETPB+ employs current-mode control with cycle-by-cycle current limiting and internal soft-start (8ms), enabling stable operation under wide VIN/VOUT combinations and transient conditions. Its dual-supply architecture separates SUP (bias regulator input) and SUPSW (high-side switch supply), supporting dropout operation at up to 99% duty cycle during undervoltage events.
It integrates a 5V BIAS linear regulator (±50mV tolerance), supports external synchronization via FSYNC (±20% window), and includes spread-spectrum modulation (±3% frequency dither) to reduce EMI-features confirmed for the MAX17242 variant in the datasheet's Electrical Characteristics and Detailed Description sections.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports wide industrial input rails and withstands 42V transients without damage. |
| Output Current | Up to 2A - sufficient for mid-power point-of-load applications without external current boosting. |
| Output Voltage Options | Fixed 3.3V/5V (±2%) or adjustable 1V–10V (±1% FB accuracy) - enables flexible rail generation with minimal external components. |
| Quiescent Current | 15µA typical in standby - extends battery life in always-on systems and reduces no-load power loss. |
| Switching Frequency | 220kHz–2.2MHz, resistor-programmable (RFOSC) - allows optimization of inductor size, efficiency, and EMI profile per design constraints. |
| Thermal Protection | 175°C junction shutdown with 15°C hysteresis - ensures reliable operation under sustained overload or poor heatsinking. |
| Package | 20-pin TQFN (5mm × 5mm) with exposed pad - provides low thermal resistance (θJA = 30°C/W) and compact board footprint. |
Pinout & Package
MAX17242ETPB+ is housed in a 20-pin, 5mm × 5mm TQFN package with exposed thermal pad (EP), rated for –40°C to +85°C operation. The EP must be soldered to a large-area contiguous copper ground plane for effective thermal dissipation and must connect to PGND-not used as sole ground reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FOSC | Frequency setting input | Connects to AGND via resistor (e.g., 12kΩ for 2.2MHz); sets oscillator frequency with ±3% spread-spectrum capability when enabled. |
| OUT | Regulated output node | Delivers final DC output; powers internal circuitry in standby when VOUT is 3V–5V; connects to LC filter and load. |
| FB | Feedback sensing input | Monitors output voltage via resistive divider; tied to BIAS for fixed 3.3V/5V; ±1% reference (1.0V) enables precise adjustable regulation. |
| COMP | Error amplifier output | External RC compensation node (e.g., 10kΩ + 1nF) stabilizes control loop for ceramic-capacitor-based designs. |
| BIAS | Internal LDO output | 5V ±0.3V regulated supply for internal logic; requires ≥2.2µF ceramic bypass to AGND for stability and noise rejection. |
| EN | Enable control input | 42V-tolerant logic input; high >2.4V enables converter; low <0.6V forces shutdown (<5µA IQ); supports UVLO via resistor divider. |
| SUP / SUPSW | Dual supply inputs | SUP powers bias regulator; SUPSW powers high-side switch; independent routing minimizes coupling and improves dropout behavior. |
| PGOOD | Open-drain status output | Asserts high when VOUT >95% of regulation; deasserts low at <92.5%; simplifies power sequencing with external pull-up to BIAS. |
| LX (pins 16–18) | Switching node | Connects to inductor; carries high di/dt current; requires low-inductance layout and 0.1µF BST capacitor to LX for gate drive. |
| PGND / AGND | Ground terminals | Separate power (PGND) and analog (AGND) grounds minimize noise coupling; must be joined at single point near EP. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck topology with integrated MOSFETs | Eliminates external Schottky diode and reduces conduction losses; RON_H ≤140mΩ and RON_L ≤70mΩ ensure high full-load efficiency. |
| Programmable PWM/PFM mode selection | FSYNC pin selects fixed-frequency PWM (for EMI-sensitive systems) or pulse-skipping PFM (for <15µA no-load IQ and >90% light-load efficiency). |
| All-ceramic capacitor support | Stable operation with as few as eight external components-including input/output caps, inductor, and RC compensation-enabling ultra-compact PCB layout. |
| Integrated protection suite | Cycle-by-cycle current limit, thermal shutdown with auto-recovery, 42V input transient rating, and overvoltage protection (107% VOUT trip) ensure field reliability. |
| Reduced EMI via spread spectrum | SPS pin enables ±3% triangular frequency dither centered on FOSC; lowers peak radiated emissions without requiring additional filtering components. |
Applications
| Distributed Supply Regulation | Wall Transformer Regulation |
|---|---|
|
Use Scenario: Powering multiple subsystems (e.g., MCU, sensors, comms ICs) from a shared 12V/24V bus in factory automation controllers. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting unregulated bus voltage to clean, tightly regulated 3.3V/5V rails. Use Value: 93% peak efficiency and 15µA standby current minimize heat buildup and system-level power loss across dozens of nodes. |
Use Scenario: Replacing linear regulators in AC/DC wall adapters to meet stringent energy-efficiency standards (e.g., DoE Level VI, EU CoC Tier 2). IC Role / Device Role / Timing Role: High-voltage input buck converter stepping down rectified AC-derived DC (e.g., 36V) to 5V USB-PD-compliant output. Use Value: 3.5V–36V input range accommodates wide line variations; 42V transient rating prevents failure during surge events. |
| General-Purpose Point-of-Load | Industrial IoT Sensor Node Power |
|
Use Scenario: Providing stable 3.3V to FPGA I/O banks or high-speed ADCs in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Local DC-DC regulator placed adjacent to load to minimize IR drop and noise coupling. Use Value: 2A output current and ±2% fixed-output accuracy ensure signal integrity and timing margin compliance for precision analog circuits. |
Use Scenario: Powering ultra-low-power microcontrollers (e.g., ARM Cortex-M0+) and wireless transceivers (LoRa, NB-IoT) in battery-operated edge sensors. IC Role / Device Role / Timing Role: Primary power management IC managing sleep/wake cycles and regulating sensor supply rails. Use Value: 5µA shutdown current and PFM mode extend 10-year battery life; EN pin enables host-controlled power gating. |
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, higher IQ (26µA) | Better suited for higher-current, fixed-frequency EMI-controlled designs; lacks light-load PFM efficiency optimization | Select LM61480RQR when >2A output or strict EMI certification (e.g., CISPR-22 Class B) is required and light-load efficiency is secondary. |
| TPS54202HDDCR | 4.5V–28V input, 2A output, 500kHz–2.5MHz adjustable frequency, 25µA IQ, no spread spectrum | Lower input voltage ceiling and higher quiescent current; lacks 42V transient rating and integrated BIAS LDO | Choose TPS54202HDDCR for cost-sensitive consumer applications where 36V input and industrial-grade transient immunity are not needed. |
Compared with LM61480RQR and TPS54202HDDCR, MAX17242ETPB+ uniquely combines 2A capability with 15µA standby IQ, 42V transient protection, and integrated spread-spectrum EMI reduction-making it optimal for space-constrained, battery-backed, or harsh-environment industrial power rails.
Availability
MAX17242ETPB+ is available at Aetrix Electronics and suitable for distributed supply regulation, wall transformer regulation, and general-purpose point-of-load applications requiring stable component supply, long-term industrial lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX17242ETPB+ 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 and mixed-signal ICs for industrial, automotive, and communications markets, emphasizing integration, reliability, and power efficiency.
The MAX17242ETPB+ belongs to Maxim's high-voltage synchronous buck converter product line, engineered specifically for rugged industrial power conversion where wide input range, low IQ, and transient resilience are critical.
FAQ
What is the maximum output current supported by the MAX17242ETPB+?
The MAX17242ETPB+ delivers up to 2A continuous output current under specified thermal conditions (TA ≤ +85°C, proper PCB copper area). Its current limit is internally set to 2.5A (min), 3.33A (typ), and 4.16A (max), ensuring robust overload handling without external current-sense components. This rating applies across the full 3.5V–36V input range and 1V–10V output range when using appropriate inductor and thermal design.
Does the MAX17242ETPB+ support both fixed and adjustable output voltages?
Yes, the MAX17242ETPB+ supports both configurations: connecting FB directly to BIAS yields fixed 3.3V or 5V outputs (±2% accuracy), while using an external resistive divider between OUT, FB, and AGND enables precise adjustment from 1V to 10V with ±1% feedback reference accuracy (VFB = 1.0V). The datasheet provides the exact resistor calculation formula and layout guidance for stable operation.
How does the MAX17242ETPB+ achieve low quiescent current in standby mode?
The MAX17242ETPB+ achieves 15µA typical quiescent current in standby by disabling switching activity while maintaining bias regulation and monitoring functions. In this state, only the internal 5V BIAS LDO and essential logic remain active-no gate drivers, error amplifier, or oscillator operate. Shutdown mode (via EN = low) further reduces current to 5µA typical by turning off the BIAS regulator entirely.
Can the MAX17242ETPB+ operate during input voltage transients above its nominal range?
Yes, the MAX17242ETPB+ withstands input transients up to 42V for durations under 1 second without damage, per its Absolute Maximum Ratings. Its dual-supply architecture (SUP and SUPSW) and internal protection circuits-including overvoltage lockout and thermal shutdown-ensure continued safe operation during automotive load-dump or industrial surge events, provided layout follows Maxim's recommended grounding and decoupling practices.
What package type and thermal characteristics does the MAX17242ETPB+ use?
The MAX17242ETPB+ uses a 20-pin TQFN package measuring 5mm × 5mm with an exposed thermal pad (EP). Its thermal resistance is θJA = 30°C/W (on a 4-layer JEDEC board) and θJC = 2°C/W, enabling efficient heat transfer to the PCB. The EP must be soldered to a large contiguous copper ground plane connected to PGND-critical for sustaining 2A output at elevated ambient temperatures.
MAX17242ETPB+ 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 (5V)
- Voltage - Output (Max):
- 10V
- Current - Output:
- 2A
- 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)
MAX17242ETPB+ FAQ
1.How can I place an order for MAX17242ETPB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17242ETPB+ 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 MAX17242ETPB+ reliable?
The price and inventory of MAX17242ETPB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17242ETPB+ is usually 5 days.
3.What payment methods are accepted for MAX17242ETPB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17242ETPB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17242ETPB+?
MAX17242ETPB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17242ETPB+ 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 MAX17242ETPB+?
For technical support, including MAX17242ETPB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17242ETPB+ requirements.
6.How does Aetrix verify that MAX17242ETPB+ is sourced from the original manufacturer or authorized distributors?
All MAX17242ETPB+ 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 MAX17242ETPB+ meets industry standards.
7.What is the process for return or replacement of MAX17242ETPB+?
All MAX17242ETPB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17242ETPB+, 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 MAX17242ETPB+ part is unused and in its original packaging.
Return procedure for MAX17242ETPB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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