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Analog Devices Inc./Maxim Integrated MAX17242ETPA+T
- Part No.:
- MAX17242ETPA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX17242ETPA+T.pdf
- Description:
- IC REG BUCK ADJ/1V 2A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,264
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Product details
Overview
MAX17242ETPA+T from Maxim Integrated is a 2A, 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 99% maximum duty cycle for dropout operation-ideal for industrial power supplies and distributed regulation in space-constrained designs.
For engineers reviewing the MAX17242ETPA+T datasheet, MAX17242ETPA+T pinout, MAX17242ETPA+T application, or MAX17242ETPA+T equivalent, key selection factors include its 20-pin TQFN package, resistor-programmable 220kHz–2.2MHz switching frequency, PFM/PWM mode control via FSYNC, ±1% FB accuracy for adjustable outputs, and integrated 5V BIAS regulator enabling all-ceramic capacitor solutions with as few as eight external components.
Technical Context
The MAX17242ETPA+T uses current-mode control architecture with internal high-side (60–140mΩ) and low-side (35–70mΩ) MOSFETs, enabling stable regulation across wide input/output ranges. Its dual-supply inputs (SUP and SUPSW) support robust transient handling up to 42V, while cycle-by-cycle current limiting and thermal shutdown with automatic recovery ensure reliable operation under overload or overtemperature conditions.
It supports flexible power sequencing via open-drain PGOOD (95%/92.5% thresholds), 8ms internal soft-start, and 42V-tolerant EN input. The device operates in either forced-PWM (constant frequency, EMI-sensitive systems) or PFM (light-load efficiency optimization), with spread-spectrum modulation (±3%) enabled via SPS pin to reduce radiated emissions.
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 without damage. |
| Output Current | 2A continuous - sufficient for powering microcontrollers, sensors, and FPGA I/O rails in compact point-of-load applications. |
| Output Voltage Options | Fixed 3.3V/5V (±2%) or adjustable 1V–10V (±1% FB accuracy) - enables single-BOM flexibility across multiple voltage domains. |
| Switching Frequency | 220kHz–2.2MHz, resistor-programmable or externally synchronized - allows trade-off between size (higher fSW → smaller L/C) and efficiency (lower fSW → reduced switching loss). |
| Quiescent Current | 15µA typical at no load - extends battery life in always-on or low-duty-cycle systems such as IoT edge nodes. |
| Efficiency | 93% peak - achieved via low-RDS(on) integrated MOSFETs and synchronous rectification, minimizing conduction losses at full load. |
| Package | 20-pin TQFN (5mm × 5mm, exposed pad) - thermally enhanced for high-power density; θJA = 30°C/W on 4-layer board. |
Pinout & Package
MAX17242ETPA+T 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 be connected 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 | Power output node | Delivers regulated DC output; powers internal circuitry during standby when VOUT = 3.3V–5V. |
| FB | Feedback sensing input | Monitors output via resistive divider (or tied to BIAS for fixed 3.3V/5V); ±1% reference accuracy enables precise regulation. |
| COMP | Error amplifier output | Accepts RC compensation network (RC/CC) for loop stability-simplifies design with all-ceramic output capacitors. |
| BIAS | Internal 5V LDO output | Provides 4.7–5.4V bias for internal logic; requires ≥2.2µF ceramic bypass to AGND for stability. |
| EN | Enable control input | 42V-tolerant logic input; high = enable, low = shutdown (5µA ISHDN); supports undervoltage lockout via resistor divider. |
| SUPSW | High-side switch supply | Separate 3.5–36V input for gate driver; bypassed with 0.1µF + 4.7µF ceramics to PGND for low-noise switching. |
| SUP | Main supply input | Powers internal bias regulator; bypassed with 2.2µF ceramic to PGND; independent of SUPSW for improved transient immunity. |
| PGOOD | Open-drain status output | Asserts high when VOUT > 95% of regulation; deasserts at <92.5%; simplifies power sequencing with external pull-up. |
| SPS | Spread-spectrum control | Pull high to enable ±3% frequency dithering (reduces EMI peaks); low disables modulation. |
| PGND / AGND | Power / analog ground | Separate ground pins minimize noise coupling; AGND serves error amplifier, PGND handles high-current LX return paths. |
| BST | Bootstrap supply | Connected via 0.1µF capacitor between BST and LX to drive high-side MOSFET gate above input rail. |
| LX (pins 16–18) | Switching node | Three parallel pins reduce inductance and thermal resistance; connects directly to inductor and BST capacitor. |
| FSYNC | External clock sync input | Enables forced-PWM mode when tied to BIAS or external clock; AGND connection selects PFM mode. |
| N.C. | No connection | Pin 19 is unconnected internally; must remain floating or grounded-no routing required. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck topology with integrated MOSFETs | Eliminates external Schottky diode and reduces BOM count; 60mΩ/35mΩ typical RDS(on) ensures high efficiency at 2A load. |
| Resistor-programmable switching frequency (220kHz–2.2MHz) | Enables layout optimization: higher frequencies allow smaller inductors/capacitors; lower frequencies improve light-load efficiency. |
| PFM/PWM mode selection via FSYNC pin | PFM disables negative inductor current and skips pulses at light loads; PWM maintains constant frequency for EMI-sensitive applications. |
| Integrated 5V BIAS regulator with 15µA quiescent current | Reduces need for external bias supply; enables ultra-low-power standby operation ideal for battery-backed systems. |
| 42V input transient protection and 99% max duty cycle | Supports operation during brownouts or cold-crank events in automotive/industrial environments without output dropout. |
| All-ceramic capacitor solution with simple RC compensation | Stabilizes loop using only one series RC on COMP pin-enables compact, low-ESR, high-reliability designs with ≤8 external components. |
Applications
| Distributed Supply Regulation | Wall Transformer Regulation |
|---|---|
Use Scenario: Local DC-DC conversion from 12V/24V bus to 3.3V/5V for sensor nodes, PLC I/O modules, or motor drivers in factory automation systems. IC Role / Device Role / Timing Role: Primary point-of-load regulator providing isolated, efficient, and transient-robust power to downstream digital ICs. Use Value: 93% peak efficiency and 15µA quiescent current extend system runtime; 42V transient tolerance prevents fault during line surges. |
Use Scenario: Replacing linear regulators or discrete buck circuits in AC/DC wall adapters delivering 5V/3.3V to consumer electronics or medical devices. IC Role / Device Role / Timing Role: High-efficiency secondary-side DC-DC stage converting unregulated rectified DC to clean, regulated output. Use Value: Eliminates heat sink requirement due to high efficiency; compact TQFN package fits tight adapter enclosures. |
| General-Purpose Point-of-Load | Industrial Control Power Management |
Use Scenario: Powering FPGA configuration banks, ADC/DAC reference supplies, or MCU cores in embedded controllers where board space is limited. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured for 1.2V, 1.8V, or 2.5V rails using external feedback resistors. Use Value: ±1% FB accuracy and low 100nA input bias current ensure precise voltage setting across temperature and load. |
Use Scenario: Providing auxiliary 5V/3.3V rails in programmable logic controllers (PLCs), HMIs, or industrial gateways requiring long-term reliability and wide-temp operation. IC Role / Device Role / Timing Role: Main system regulator with PGOOD signaling for safe boot sequencing and thermal shutdown with auto-recovery for unattended operation. Use Value: –40°C to +85°C rating, cycle-by-cycle current limit, and 175°C thermal shutdown ensure uptime in harsh 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 |
|---|---|---|---|
| MAX17243ETPA+T | Same pinout and feature set, but rated for 3A output current and higher LX current limit (3.75–6.25A vs. 2.5–4.16A). | Preferred for higher-current loads (>2A); requires larger inductor and output capacitance to maintain thermal performance. | Select MAX17243ETPA+T when output current exceeds 2A; otherwise MAX17242ETPA+T offers optimal cost/size balance. |
| LM61480RQR | 3.5–36V input, 8A capable, 2.1MHz fixed-frequency, no PFM mode; requires external compensation and lacks integrated BIAS LDO. | Better suited for high-current, high-density power delivery; less suitable for ultra-low-quiescent or PFM-optimized battery systems. | Choose LM61480RQR only when >3A output or tighter EMI control via fixed-frequency is required; MAX17242ETPA+T provides simpler design with lower IQ and built-in bias rail. |
Compared with MAX17243ETPA+T, the MAX17242ETPA+T delivers optimized thermal performance at 2A with identical footprint and feature set; versus LM61480RQR, it trades raw current capacity for lower quiescent current, integrated bias supply, and PFM mode-making it superior for space- and energy-constrained industrial point-of-load applications.
Availability
MAX17242ETPA+T is available at Aetrix Electronics and suitable for industrial control systems, distributed power architectures, and wall-adapter-based consumer electronics requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX17242ETPA+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 MAX17242/MAX17243 product line targets high-efficiency, low-quiescent-current DC-DC conversion in space-constrained industrial and embedded systems-emphasizing wide-input operation, robust protection, and simplified layout with integrated MOSFETs and bias regulation.
FAQ
What is the maximum output current supported by the MAX17242ETPA+T?
The MAX17242ETPA+T is rated for continuous 2A output current. Its internal high-side and low-side MOSFETs have typical RDS(on) values of 60mΩ and 35mΩ respectively, enabling this current level with acceptable thermal rise in the 5mm × 5mm TQFN package under standard PCB layout conditions. Peak LX current limit is specified from 2.5A to 4.16A depending on operating conditions.
Does the MAX17242ETPA+T support adjustable output voltage?
Yes, the MAX17242ETPA+T supports both fixed and adjustable outputs. Connecting FB directly to BIAS yields fixed 3.3V or 5V (±2% accuracy). For adjustable operation from 1V to 10V, an external resistive divider is connected between OUT and AGND, with FB at the midpoint; the device guarantees ±1% feedback reference accuracy (VFB = 1.00V) for precise regulation.
How does the MAX17242ETPA+T achieve low quiescent current in standby mode?
The MAX17242ETPA+T achieves 15µA typical quiescent current in standby by disabling switching activity while maintaining bias regulation and monitoring functions. In this state, the internal 5V BIAS LDO remains active to power control logic, but the power stage is gated off. Shutdown mode further reduces current to 5µA typical by turning off the BIAS regulator entirely when EN is pulled low.
Can the MAX17242ETPA+T operate during input voltage dropout conditions?
Yes, the MAX17242ETPA+T supports dropout operation with up to 99% duty cycle, allowing it to maintain regulation even when input voltage approaches the output voltage. This behavior is enabled automatically when off-time falls below ~100ns for 12µs; the device forces the low-side FET on periodically to sustain conduction, making it suitable for automotive cold-crank or industrial brownout scenarios.
What package type and thermal characteristics apply to the MAX17242ETPA+T?
The MAX17242ETPA+T uses a 20-pin TQFN package measuring 5mm × 5mm with an exposed thermal pad (EP). Its junction-to-ambient thermal resistance (θJA) is 30°C/W on a standard 4-layer JEDEC board, and junction-to-case (θJC) is 2°C/W. The EP must be soldered to a large contiguous copper ground plane connected to PGND to realize these ratings and ensure reliable 2A operation at +85°C ambient.
MAX17242ETPA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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)
MAX17242ETPA+T FAQ
1.How can I place an order for MAX17242ETPA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17242ETPA+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 MAX17242ETPA+T reliable?
The price and inventory of MAX17242ETPA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17242ETPA+T is usually 5 days.
3.What payment methods are accepted for MAX17242ETPA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17242ETPA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17242ETPA+T?
MAX17242ETPA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17242ETPA+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 MAX17242ETPA+T?
For technical support, including MAX17242ETPA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17242ETPA+T requirements.
6.How does Aetrix verify that MAX17242ETPA+T is sourced from the original manufacturer or authorized distributors?
All MAX17242ETPA+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 MAX17242ETPA+T meets industry standards.
7.What is the process for return or replacement of MAX17242ETPA+T?
All MAX17242ETPA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17242ETPA+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 MAX17242ETPA+T part is unused and in its original packaging.
Return procedure for MAX17242ETPA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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