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Analog Devices Inc./Maxim Integrated MAX17243ETPB+T
- Part No.:
- MAX17243ETPB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX17243ETPB+T.pdf
- Description:
- IC REG BUCK ADJ/1V 3A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,446
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Product details
Overview
The MAX17243ETPB+T 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 MAX17243ETPB+T datasheet, MAX17243ETPB+T pinout, MAX17243ETPB+T application, or MAX17243ETPB+T equivalent, key selection criteria include its 3A output capability, 99% dropout duty cycle, PGOOD signaling, thermal shutdown with auto-recovery, and compatibility with all-ceramic capacitor designs requiring ≤8 external components.
Technical Context
This device uses current-mode control architecture supporting both PWM (constant-frequency) and PFM (pulse-skipping) operation modes. Its dual-supply inputs (SUP and SUPSW) enable robust transient handling up to 42V, while internal 5V BIAS regulator powers analog circuitry and supports self-biasing during standby.
The IC integrates high-side (60–140mΩ) and low-side (35–70mΩ) MOSFETs, features cycle-by-cycle current limiting, 8ms soft-start, and ±3% spread-spectrum modulation synchronized via FSYNC pin-enabling EMI-sensitive applications without external filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous-supports compact 3A PoL designs without external current-sense resistors. |
| Input Voltage Range | 3.5V to 36V-enables direct use with 12V/24V industrial rails and automotive battery inputs. |
| 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 sensor nodes. |
| Efficiency | 93% peak at 3A/5V out-reduces thermal load in sealed enclosures and eliminates need for heatsinks. |
| Duty Cycle Max | 99%-maintains regulation during severe input undervoltage transients (e.g., cold-cranking). |
| Thermal Protection | 175°C shutdown with 15°C hysteresis-prevents permanent damage during sustained overload. |
Pinout & Package
MAX17243ETPB+T 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 via EP-to-PGND connection.
| 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 when enabled. |
| OUT | Regulated output node | Delivers 3.3V/5V fixed or 1V–10V adjustable output; powers internal circuitry when VOUT ≥ 3V in standby. |
| FB | Feedback reference input | Accepts resistive divider for adjustable output or connects directly to BIAS for 3.3V/5V fixed mode (±2% accuracy). |
| COMP | Error amplifier output | External RC compensation network stabilizes loop-single RC sufficient for ceramic-capacitor outputs. |
| BIAS | Internal LDO output | 5V ±0.3V regulated supply for internal logic; requires ≥2.2µF ceramic bypass to AGND. |
| EN | Enable control input | 42V-tolerant logic input; high = active, low = shutdown (5µA IQ); enables UVLO threshold setting via resistor divider. |
| SUP / SUPSW | Dual supply inputs | SUP powers bias regulator; SUPSW powers high-side switch-separate paths improve transient immunity and layout flexibility. |
| PGOOD | Open-drain status signal | Asserts high when VOUT > 95% of target; deasserts below 92.5%; simplifies power sequencing with external pull-up. |
| LX (16–18) | Switching node | Three parallel pins reduce trace inductance and conduction loss; connect to inductor and BST capacitor. |
| PGND (13–14) | Power ground return | Separate from AGND to minimize noise coupling; must be connected to EP for thermal performance. |
| 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 | Connect to BIAS or external clock for forced-PWM; connect to AGND for PFM mode-enables system-level frequency coordination. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFET integration | Eliminates external Schottky diode and reduces BOM count-enables ultra-compact all-ceramic designs with ≤8 external parts. |
| Programmable switching frequency | 220kHz–2.2MHz via single resistor-supports wide range of inductor values and optimizes efficiency across load conditions. |
| Low-quiescent-current standby | 15µA typical at 3.3V/5V output-enables multi-year battery operation in remote sensors and metering devices. |
| Robust protection suite | Cycle-by-cycle current limit, thermal shutdown with auto-recovery, 42V input transient tolerance, and overvoltage protection-ensures field reliability without external supervision. |
| Flexible output configuration | Pin-selectable 3.3V/5V fixed output (±2%) or resistor-adjustable 1V–10V (±1% FB accuracy)-reduces SKU proliferation across product variants. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Distributed 5V rail generation from 24V vehicle battery in body control units with strict EMI limits. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 5V/3A to microcontroller, CAN transceivers, and I/O drivers. Use Value: Spread-spectrum operation reduces conducted EMI peaks by >10dB, eliminating need for ferrite beads or additional LC filters. | Use Scenario: Point-of-load conversion in infotainment head unit requiring low-noise 3.3V for DSP and memory subsystems. IC Role / Device Role / Timing Role: High-efficiency synchronous buck supplying 3.3V/3A with PGOOD monitoring for safe processor boot sequencing. Use Value: 93% peak efficiency minimizes heat rise in thermally constrained plastic enclosures, enabling fanless design. |
| Smart Sensor Node | Programmable Logic Controller (PLC) |
Use Scenario: Battery-powered wireless vibration sensor operating for >5 years on two AA cells. IC Role / Device Role / Timing Role: Ultra-low-IQ buck converter stepping down 3.6V nominal Li-ion to 3.3V for MCU and RF transceiver. Use Value: 15µA standby current extends battery life beyond 60 months under typical wake/sleep duty cycles. | Use Scenario: DIN-rail mounted PLC requiring reliable 5V/3A supply from 24V DC field bus with surge immunity. IC Role / Device Role / Timing Role: Main DC-DC stage with 42V transient protection and 99% dropout capability during brownouts. Use Value: Dual SUP/SUPSW inputs and thermal auto-recovery prevent lockup during voltage sags or ambient temperature spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5V–65V input, 1.5A output, 500kHz–2.2MHz sync-capable, no integrated BIAS LDO | Higher input voltage range but lower output current; requires external bias supply | Select when input exceeds 36V or when higher VIN transient immunity is required; verify external bias design. |
| TPS54332DR | 3.5V–28V input, 3A output, 100kHz–2.5MHz adjustable, no spread spectrum or PGOOD | Lacks PGOOD, spread-spectrum, and 42V transient rating; simpler feature set | Choose for cost-sensitive industrial applications where EMI and sequencing are less critical. |
Compared with LM5164QPWPRQ1 and TPS54332DR, the MAX17243ETPB+T uniquely combines 3A output, integrated 5V BIAS LDO, PGOOD, 42V transient tolerance, and spread-spectrum EMI reduction in a single 5mm × 5mm package-making it optimal for space-constrained, high-reliability systems requiring full-feature integration.
Availability
MAX17243ETPB+T is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and smart infrastructure projects requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX17243ETPB+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 demanding industrial, automotive, and communications applications.
The MAX17243ETPB+T belongs to Maxim's high-efficiency synchronous buck converter family, engineered for wide-input industrial power supplies and battery-powered systems needing low IQ, robust protection, and EMI-compliant operation.
FAQ
What is the maximum output current capability of the MAX17243ETPB+T?
The MAX17243ETPB+T delivers up to 3A continuous output current under specified thermal conditions. This rating assumes proper PCB layout with adequate copper area for the exposed pad (EP), ambient temperature ≤+85°C, and appropriate input/output capacitors. Peak current limit is 3.75A (min), 5A (typ), and 6.25A (max), providing margin for transient loads without triggering shutdown.
Does the MAX17243ETPB+T support adjustable output voltage?
Yes, the MAX17243ETPB+T supports both fixed and adjustable output voltages. Connecting FB directly to BIAS selects 3.3V or 5V fixed output (±2% accuracy). For 1V–10V adjustment, use an external resistive divider from OUT to FB to AGND, leveraging the 1.00V ±1% feedback reference (VFB) for ±1% output accuracy across the range.
How does the MAX17243ETPB+T handle input voltage transients?
The MAX17243ETPB+T withstands 42V input transients for <1 second and operates continuously up to 36V. Its dual-supply architecture (SUP and SUPSW) isolates bias and switching functions, while 99% maximum duty cycle maintains regulation during severe undervoltage events like cold-cranking. Internal cycle-by-cycle current limiting and thermal shutdown with automatic recovery further enhance transient resilience.
What is the purpose of the SPS pin on the MAX17243ETPB+T?
The SPS (Spread-Spectrum) pin on the MAX17243ETPB+T enables ±3% frequency dithering centered on the programmed switching frequency (e.g., 2.2MHz) to reduce EMI peak emissions. Pulling SPS high activates triangular-wave modulation (110μs period at 2.2MHz); pulling it low disables spread-spectrum. When synchronized to an external clock via FSYNC, internal spread-spectrum is disabled-but external clock modulation passes through.
Can the MAX17243ETPB+T operate in forced-PWM mode at light loads?
Yes, the MAX17243ETPB+T can operate in forced-PWM mode at all loads by connecting the FSYNC pin to BIAS or an external clock source. This ensures constant switching frequency regardless of load, improving EMI predictability and reducing beat frequencies in noise-sensitive applications-unlike PFM mode, which skips pulses at light loads to maximize efficiency.
MAX17243ETPB+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 (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+T FAQ
1.How can I place an order for MAX17243ETPB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17243ETPB+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 MAX17243ETPB+T reliable?
The price and inventory of MAX17243ETPB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17243ETPB+T is usually 5 days.
3.What payment methods are accepted for MAX17243ETPB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17243ETPB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17243ETPB+T?
MAX17243ETPB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17243ETPB+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 MAX17243ETPB+T?
For technical support, including MAX17243ETPB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17243ETPB+T requirements.
6.How does Aetrix verify that MAX17243ETPB+T is sourced from the original manufacturer or authorized distributors?
All MAX17243ETPB+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 MAX17243ETPB+T meets industry standards.
7.What is the process for return or replacement of MAX17243ETPB+T?
All MAX17243ETPB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17243ETPB+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 MAX17243ETPB+T part is unused and in its original packaging.
Return procedure for MAX17243ETPB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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