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Analog Devices Inc./Maxim Integrated MAX17242ETPA+
- Part No.:
- MAX17242ETPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX17242ETPA+.pdf
- Description:
- IC REG BUCK ADJ/1V 2A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,918
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Product details
Overview
MAX17242ETPA+ 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% duty-cycle dropout operation-enabling reliable power delivery in automotive front-end and industrial distributed supply applications.
For engineers reviewing the MAX17242ETPA+ datasheet, MAX17242ETPA+ pinout, MAX17242ETPA+ application, or MAX17242ETPA+ equivalent, key selection considerations 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 60mΩ/35mΩ high-side/low-side MOSFETs.
Technical Context
The MAX17242ETPA+ employs current-mode control with cycle-by-cycle current limiting and internal soft-start (8ms), enabling stable regulation across wide input/output combinations. Its dual-supply architecture separates SUP (bias regulator input) and SUPSW (switch driver input), allowing robust operation during 42V transients and undervoltage events.
It supports three operational modes: forced-PWM (via FSYNC tied to BIAS or external clock), PFM (FSYNC to AGND), and spread-spectrum modulation (SPS high), reducing EMI by ±3% frequency dithering. The BIAS pin delivers a regulated 5V output (4.7–5.4V) to power internal circuitry and external bias needs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports wide-range industrial and automotive inputs; withstands 42V transient surges. |
| Output Current | 2A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in point-of-load designs. |
| Output Voltage Options | Fixed 3.3V/5V (±2%) or adjustable 1V–10V (±1% FB accuracy) - enables flexible rail generation without external DAC or LDO post-regulation. |
| Quiescent Current | 15µA typical at 3.3V output - extends battery life in always-on IoT and remote monitoring systems. |
| Switching Frequency | 220kHz–2.2MHz, resistor-programmable (RFOSC) and externally synchronizable - allows optimization of size (higher fSW → smaller L/C) and EMI (spread-spectrum or sync). |
| Efficiency | 93% peak - achieved via low RDS(on) integrated MOSFETs (60mΩ HS / 35mΩ LS) and synchronous rectification. |
| Thermal Protection | 175°C junction shutdown with 15°C hysteresis - ensures safe operation under overload or poor heatsinking conditions. |
Pinout & Package
MAX17242ETPA+ is housed in a compact 20-pin, 5mm × 5mm TQFN package with exposed pad (EP), rated for –40°C to +85°C ambient operation. Thermal resistance θJA = 30°C/W (4-layer board), enabling high-power density without external heatsink in most PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FOSC | Frequency setting input | Connects to AGND via resistor (e.g., 12kΩ for 2.2MHz); sets switching frequency and enables external sync when used with FSYNC. |
| OUT | Regulated output node | Delivers final DC output; powers internal circuitry during standby when VOUT ≥ 3V. |
| FB | Feedback sensing input | Monitors output via resistive divider; connects directly 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-critical for all-ceramic capacitor designs. |
| BIAS | Internal LDO output | Provides regulated 5V (4.7–5.4V) to power internal logic and external circuitry; requires ≥2.2µF ceramic bypass to AGND. |
| EN | Enable control input | 42V-tolerant logic input; high = active, low = shutdown (5µA ISHDN); enables programmable UVLO using 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 | 3.5–36V input for internal bias regulator; bypassed with 2.2µF ceramic to PGND. |
| PGOOD | Power-good status output | Open-drain signal asserting when VOUT > 95% regulation and deasserting at <92.5%; simplifies power sequencing in multi-rail systems. |
| SPS | Spread-spectrum enable | Pull high to enable ±3% frequency dithering (reduces EMI peaks); disabled when synchronized to external clock. |
| LX (16–18) | Switching node | Connects to inductor; carries high di/dt current; requires low-inductance layout and tight coupling to PGND/BST. |
| PGND (13–14) | Power ground return | Dedicated low-impedance path for high-current switch return; must be separated from AGND except at single-point EP connection. |
| BST | Bootstrap supply | Connects 0.1µF capacitor between BST and LX to drive high-side MOSFET gate above input rail. |
| FSYNC | Mode and sync control | Tie to AGND for PFM; tie to BIAS or external clock for forced-PWM; sync lock achieved in ≤2 cycles. |
| AGND | Analog ground reference | Reference for FB, COMP, FOSC, SPS, FSYNC; must be routed separately from PGND and joined only at EP. |
| N.C. | No connection | Pin 19 is unconnected internally; leave floating or grounded per layout best practices (no functional impact). |
| EP | Exposed thermal pad | Must be soldered to large copper pour connected to PGND; primary thermal path-critical for power dissipation and reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck topology with integrated MOSFETs | Eliminates external Schottky diode and reduces BOM count; 60mΩ/35mΩ RDS(on) enables high efficiency at full load without external drivers. |
| Resistor-programmable and synchronizable switching frequency | Enables design flexibility: RFOSC sets base frequency (220kHz–2.2MHz); FSYNC allows system-level clock alignment to reduce beat frequencies. |
| PGOOD and 42V transient-rated EN input | Supports robust power sequencing and direct connection to unregulated rails-no external level-shifting or protection needed for EN. |
| All-ceramic capacitor support with simple RC compensation | Reduces solution size and cost: stable operation with as few as eight external components; no electrolytic or tantalum required. |
| PFM/PWM mode selection and spread-spectrum EMI reduction | Extends battery life in light-load operation (PFM) while meeting strict EMI limits (spread-spectrum or sync) in noise-sensitive environments. |
Applications
| Automotive Front-End Power | Industrial Distributed Supply |
|---|---|
|
Use Scenario: Powering infotainment SoCs and CAN transceivers from 12V battery with cold-crank tolerance down to 3.5V. IC Role / Device Role / Timing Role: Primary buck regulator providing clean, sequenced 3.3V/5V rails with PGOOD signaling for system reset coordination. Use Value: 99% duty-cycle operation maintains regulation during 6V battery dips; 42V transient rating protects against load-dump spikes. |
Use Scenario: Generating local 5V/3.3V supplies for PLC I/O modules powered from 24V industrial bus. IC Role / Device Role / Timing Role: Point-of-load converter delivering 2A with minimal external components and thermal footprint. Use Value: 15µA quiescent current reduces standby power; TQFN-20 package fits dense control boards with no heatsink required. |
| IoT Edge Sensor Node | Wall Adapter Replacement |
|
Use Scenario: Battery-powered environmental sensor node requiring ultra-low sleep current and fast wake-up response. IC Role / Device Role / Timing Role: Main power stage operating in PFM mode at µA loads, transitioning to PWM during data transmission bursts. Use Value: 5µA shutdown current and 15µA standby current maximize battery lifetime; 8ms soft-start prevents inrush into capacitive loads. |
Use Scenario: Replacing linear wall adapters in medical monitors and test equipment needing low-noise, efficient 5V/3.3V conversion. IC Role / Device Role / Timing Role: High-efficiency isolated-secondary replacement, eliminating transformer losses and heat buildup. Use Value: 93% peak efficiency reduces thermal stress; spread-spectrum mode meets Class B conducted/radiated EMI standards without shielding. |
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 | 3.5–36V input, 8A output, 50µA IQ, fixed 2.1MHz fSW, no PFM mode | Higher current capability but larger solution size; lacks PFM for ultra-low-IQ operation | Choose LM61480RQR when >2A output or higher thermal margin is required; avoid if PFM efficiency at µA loads is critical. |
| TPS54202HDDCR | 4.5–28V input, 2A output, 20µA IQ, 400kHz–2.5MHz fSW, integrated compensation | Lower max input voltage; no spread-spectrum; uses internal compensation (less flexible than MAX17242's external RC) | Choose TPS54202HDDCR for simpler layout where 28V max input suffices and external compensation tuning is unnecessary. |
Compared with LM61480RQR and TPS54202HDDCR, the MAX17242ETPA+ uniquely combines 36V input tolerance, 15µA standby current, PFM/PWM mode selectability, and spread-spectrum EMI reduction in a 5mm × 5mm package-making it optimal for space-constrained, battery-aware, and EMI-sensitive industrial and automotive designs.
Availability
MAX17242ETPA+ is available at Aetrix Electronics and suitable for automotive front-end power, industrial distributed supply, and IoT edge sensor node applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX17242ETPA+ 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 MAX17242/MAX17243 family targets high-reliability, wide-input DC-DC conversion in space-constrained systems-emphasizing ultra-low quiescent current, transient robustness, and EMI control without sacrificing efficiency or simplicity.
FAQ
What is the maximum output current supported by the MAX17242ETPA+?
The MAX17242ETPA+ delivers up to 2A continuous output current. This rating is validated across the full –40°C to +85°C operating temperature range and accounts for thermal derating in the 20-pin TQFN package. Peak current capability reaches 2.5A (min) before cycle-by-cycle current limit activates, ensuring robust short-circuit and overload protection. The MAX17242ETPA+ is distinct from the pin-compatible MAX17243 (3A variant), and output current must not exceed 2A even with enhanced cooling.
Does the MAX17242ETPA+ support both fixed and adjustable output voltages?
Yes, the MAX17242ETPA+ supports both configurations. For fixed output, connect the FB pin directly to the BIAS pin to select either 3.3V or 5V (±2% accuracy). For adjustable output from 1V to 10V, use an external resistive divider from OUT to FB to AGND, leveraging the ±1% accurate 1.0V feedback reference (VFB). The MAX17242ETPA+ datasheet provides the exact resistor calculation formula and layout guidance for stable operation across the full range.
How does the MAX17242ETPA+ achieve ultra-low quiescent current?
The MAX17242ETPA+ achieves 15µA typical quiescent current (at 3.3V output) through architectural optimizations including a dedicated low-power bias regulator, intelligent gate driver control, and dynamic circuit activation. In standby mode, non-essential blocks are gated off while maintaining regulation and PGOOD functionality. Shutdown current drops further to 5µA (typ) when EN is pulled low. These values are measured per the datasheet conditions and confirmed across temperature and input voltage ranges.
Can the MAX17242ETPA+ operate during input voltage transients?
Yes, the MAX17242ETPA+ is designed for transient resilience. It withstands 42V input transients on both SUP and SUPSW pins for <1s, and operates continuously down to 3.5V input. Crucially, it supports 99% duty-cycle operation to maintain regulation during severe undervoltage events (e.g., automotive cold-crank), where input may dip below the output voltage. Internal cycle-by-cycle current limiting and thermal shutdown with automatic recovery ensure safe operation throughout such events.
What package type and thermal characteristics does the MAX17242ETPA+ use?
The MAX17242ETPA+ uses a 20-pin, 5mm × 5mm TQFN package with exposed pad (EP). Its thermal performance is characterized by θJA = 30°C/W (on JEDEC JESD51-7 4-layer board) and θJC = 2°C/W. The EP must be soldered to a large, low-thermal-resistance PGND copper area to realize these ratings. Derating begins above +70°C ambient (33.3mW/°C), supporting continuous 2A operation up to +85°C ambient with proper PCB layout.
MAX17242ETPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Strip
- 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+ FAQ
1.How can I place an order for MAX17242ETPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17242ETPA+ 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+ reliable?
The price and inventory of MAX17242ETPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17242ETPA+ is usually 5 days.
3.What payment methods are accepted for MAX17242ETPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17242ETPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17242ETPA+?
MAX17242ETPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17242ETPA+ 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+?
For technical support, including MAX17242ETPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17242ETPA+ requirements.
6.How does Aetrix verify that MAX17242ETPA+ is sourced from the original manufacturer or authorized distributors?
All MAX17242ETPA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX17242ETPA+?
All MAX17242ETPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17242ETPA+, 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+ part is unused and in its original packaging.
Return procedure for MAX17242ETPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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