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Analog Devices Inc./Maxim Integrated MAX17245ETERA+T
- Part No.:
- MAX17245ETERA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX17245ETERA+T.pdf
- Description:
- IC REG BCK PROG/1V 3.5A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,667
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Product details
Overview
MAX17245ETERA+T from Maxim Integrated is a synchronous step-down DC-DC converter with integrated high-side and low-side MOSFETs, operating from 3.5V to 36V input and delivering up to 3.5A output current. It supports fixed 3.3V/5V outputs (±2% accuracy) or adjustable 1V–10V via external resistor divider, features 28µA quiescent current in PFM mode, and includes 42V input transient protection for automotive and industrial power rails.
For engineers reviewing the MAX17245ETERA+T datasheet, MAX17245ETERA+T pinout, MAX17245ETERA+T application, or MAX17245ETERA+T equivalent, key selection criteria include its 98% max duty cycle for dropout operation, programmable 220kHz–2.2MHz switching frequency, spread-spectrum EMI reduction, and dual-mode PWM/PFM control optimized for RF-sensitive and battery-powered systems.
Technical Context
The MAX17245ETERA+T uses current-mode control with selectable PWM or PFM operation: PWM maintains constant 220kHz–2.2MHz frequency across all loads, while PFM disables negative inductor current and skips pulses at light loads to achieve >90% peak efficiency and 5µA shutdown current. Its FSYNC pin enables mode selection-AGND for PFM, BIAS or external clock for forced-PWM.
It integrates a 5V BIAS LDO (4.7–5.4V output), 180° out-of-phase SYNCOUT for cascaded supplies, open-drain PGOOD with 95%/92% VFB thresholds, and automatic LX slew-rate adjustment (4ns at >1.1MHz, 8ns at <1.1MHz) to minimize EMI without sacrificing efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V; withstands 42V transients for ≤1s-enables robust operation in automotive cold-crank and industrial 24V rail environments. |
| Output Current | Up to 3.5A continuous; supports peak LX current of 4.2–6.2A-sufficient for point-of-load regulation in FPGA, MCU, and sensor subsystems. |
| Quiescent Current | 28µA typical in PFM no-load mode; 5µA in shutdown-extends battery life in always-on IoT and telematics applications. |
| Switching Frequency | 220kHz–2.2MHz, resistor-programmable via FOSC pin; supports external sync up to ±20%-allows EMI optimization and inductor size reduction. |
| Output Accuracy | ±2% for fixed 3.3V/5V outputs; ±1% FB reference (0.99–1.015V) for adjustable configurations-ensures stable voltage for precision analog and RF circuitry. |
| Thermal Protection | Thermal shutdown at +175°C with 15°C hysteresis; junction-to-ambient θJA = 35°C/W (TQFN)-supports reliable operation in sealed enclosures without forced airflow. |
| EMI Reduction | Integrated spread-spectrum (±6% frequency dither, 110µs period at 2.2MHz); disabled during external sync-lowers peak radiated emissions without external filtering. |
Pinout & Package
The MAX17245ETERA+T is housed in a 5mm × 5mm, 16-pin TQFN package with exposed pad (EP), rated for –40°C to +85°C operation. The EP must be soldered to a large-area PGND copper plane for thermal management and cannot serve as the sole ground connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNCOUT) | Open-drain clock output | Provides 180° out-of-phase signal relative to internal oscillator; enables synchronized multi-phase buck designs when connected to OUT of another device via 100Ω–1kΩ resistor. |
| 2 (FSYNC) | Mode-select logic input | Drives PFM mode when tied to AGND; enables fixed-frequency PWM when pulled to BIAS or driven by external clock-critical for EMI-sensitive RF power supplies. |
| 3 (FOSC) | Frequency-setting input | Resistor-to-AGND sets switching frequency (220kHz–2.2MHz); determines inductor size, core loss trade-offs, and ripple current magnitude. |
| 4 (OUT) | Power output node | Delivers regulated output; powers internal circuitry when VOUT is 3–5V in standby-eliminates need for separate bias supply in compact designs. |
| 5 (FB) | Feedback input | Monitors output via resistive divider; connects directly to BIAS for fixed 5V-enables precise regulation with ±1% reference voltage and 0.02%/V line regulation. |
| 6 (COMP) | Error amplifier output | Connects to RC compensation network; stabilizes loop response against load and line transients-requires external R-C components per design requirements. |
| 7 (BIAS) | Internal LDO output | 5V linear regulator output (4.7–5.4V); powers internal logic and gate drivers-must be bypassed with 1µF ceramic capacitor to AGND for noise immunity. |
| 8 (AGND) | Analog ground reference | Separate ground for feedback, compensation, and oscillator circuits-must be star-connected to PGND at single point to avoid noise coupling. |
| 9 (EN) | Enable input | High-voltage compatible (up to 42V); activates device when >2.4V, shuts down below 0.6V-supports direct connection to automotive KL30 or CAN transceiver INH pins. |
| 10 (SUP) | Main logic supply input | Powers internal LDO; requires 4.7µF ceramic bypass to PGND-recommended to add RC filter for noise-sensitive applications. |
| 11 (SUPSW) | Switch driver supply input | Powers high-side MOSFET gate driver; bypassed with 0.1µF + 4.7µF ceramics-ensures robust switching under high-current transients. |
| 12 (LX) | Switching node | Connects to inductor and external Schottky diode; requires 0.1µF BST capacitor between LX and BST-critical for high-side gate drive integrity. |
| 13–14 (PGND) | Power ground | Low-impedance return path for high-current switch node and output capacitor-must be solidly connected to EP and external ground plane. |
| 15 (PGOOD) | Open-drain power-good | Asserts high when VOUT >95% of regulation; deasserts below 92%-simplifies power sequencing in multi-rail systems with pull-up to BIAS. |
| 16 (EP) | Exposed thermal pad | Internally connected to PGND; requires solder mask-defined thermal relief and ≥4 thermal vias to inner ground layers-primary path for heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side MOSFETs | Eliminates external switches and reduces BOM count; RDS(on) = 100–220mΩ (HS), 1.5–3Ω (LS)-enables >90% peak efficiency without discrete FET losses. |
| All-ceramic capacitor support | Enables ultra-compact PCB layout with no electrolytic or tantalum capacitors required-reduces footprint and improves reliability in high-vibration environments. |
| 180° out-of-phase SYNCOUT | Allows interleaving of multiple MAX17245ETERA+T devices to halve input/output ripple current-increases total system power capacity without increasing per-device stress. |
| Automatic LX slew-rate control | Adjusts gate drive rise time (4ns at >1.1MHz, 8ns at <1.1MHz) based on selected fSW-optimizes EMI performance across full frequency range without manual tuning. |
| Fixed 8ms soft-start | Reduces inrush current during startup-prevents input rail collapse in shared power systems and eliminates need for external soft-start circuitry. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Power |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to 3.3V/5V for microcontrollers, CAN transceivers, and sensors in door modules and lighting controllers. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing stable, low-noise supply with 42V transient tolerance and cold-crank dropout capability. Use Value: Enables single-stage conversion from harsh automotive input to logic-level voltages without pre-regulator, reducing component count and board area by 30% versus discrete solutions. | Use Scenario: Generating isolated 5V/3.3V rails for digital I/O expansion cards in programmable logic controllers operating from 24V industrial bus. IC Role / Device Role / Timing Role: Point-of-load DC-DC converter delivering 3.5A with PGOOD signaling for system-level power sequencing and fault reporting. Use Value: Provides tight output accuracy (±2%), low quiescent current (28µA), and thermal shutdown recovery-ensuring uptime in unventilated control cabinets. |
| RF Transceiver Power Supply | IoT Edge Node Power |
Use Scenario: Powering LTE/5G modem baseband and RF front-end ICs requiring ultra-low EMI and fixed-frequency operation to meet FCC/CE emission limits. IC Role / Device Role / Timing Role: EMI-optimized buck converter operating in forced-PWM mode with spread-spectrum disabled and external clock sync. Use Value: Achieves <–55dBc conducted emissions at 100MHz using only 2-layer PCB and minimal filtering-reducing certification risk and time-to-market. | Use Scenario: Supplying 3.3V to ultra-low-power MCUs and BLE/Wi-Fi SoCs in battery-operated smart sensors with multi-year runtime requirements. IC Role / Device Role / Timing Role: High-efficiency buck regulator operating in PFM mode at light loads, with 5µA shutdown current and programmable output voltage. Use Value: Extends coin-cell or LiSOCl₂ battery life by 2.1× versus standard PWM-only converters due to sub-30µA no-load consumption and automatic light-load pulse skipping. |
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 | 4.5V–36V input, 8A output, 2.1MHz max fSW, 15µA IQ; no integrated BIAS LDO or SYNCOUT; requires external bootstrap capacitor. | Better suited for higher-current applications (>5A) where footprint is secondary; lacks cascading clock capability and integrated bias supply. | Select LM61480RQR when output current demand exceeds 3.5A and system-level synchronization is not required. |
| TPS54361DRCT | 3.5V–60V input, 3.5A output, 100kHz–2.5MHz fSW, 145µA IQ; no PFM mode, no spread-spectrum, no BIAS LDO; requires external VREF. | Preferred for wide-input industrial applications needing >36V tolerance; unsuitable for battery-powered systems due to higher quiescent current. | Choose TPS54361DRCT when input voltage may exceed 36V and EMI constraints are less stringent than RF-sensitive designs. |
Compared with LM61480RQR and TPS54361DRCT, the MAX17245ETERA+T uniquely combines integrated BIAS LDO, 180° SYNCOUT, 28µA PFM quiescent current, and factory-enabled spread-spectrum-making it optimal for space-constrained, EMI-sensitive, and battery-aware designs where 3.5A output suffices.
Availability
MAX17245ETERA+T is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, RF transceiver power supplies, and IoT edge node designs requiring stable component supply, long lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX17245ETERA+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 MAX17245ETERA+T belongs to Maxim's high-efficiency synchronous buck converter product line, engineered specifically for wide-input, low-quiescent-current, and EMI-conscious power delivery in automotive and industrial embedded systems.
FAQ
What is the maximum input voltage transient rating for the MAX17245ETERA+T?
The MAX17245ETERA+T is rated for 42V input transients lasting up to 1 second, as specified in its Absolute Maximum Ratings table. This protection applies under normal operating conditions and loads up to the rated 3.5A output current. The device self-protects against transients exceeding this limit for ≤50ns. For sustained overvoltage events beyond 42V, external clamping is required.
Can the MAX17245ETERA+T operate in dropout mode, and what is its maximum duty cycle?
Yes, the MAX17245ETERA+T operates in dropout mode with a maximum duty cycle of 98%, enabling regulation even when input voltage drops close to the output voltage-critical for automotive cold-crank scenarios. This behavior is achieved without external components and is verified across the full –40°C to +85°C temperature range.
How does the FSYNC pin control operating mode in the MAX17245ETERA+T?
The FSYNC pin selects between PFM and forced-PWM modes: connecting FSYNC to AGND enables PFM for highest light-load efficiency (28µA IQ), while pulling FSYNC to BIAS or applying an external clock enables fixed-frequency PWM to suppress EMI. The device synchronizes to an external clock within one cycle and reverts to internal oscillation if the clock is absent for >2 cycles.
What are the thermal resistance values for the MAX17245ETERA+T in its TQFN package?
The MAX17245ETERA+T in the 5mm × 5mm TQFN package has a junction-to-ambient thermal resistance (θJA) of 35°C/W and junction-to-case (θJC) of 2.7°C/W, measured per JEDEC51 on a multilayer board. These values assume proper soldering of the exposed pad (EP) to a large PGND copper area with ≥4 thermal vias.
Does the MAX17245ETERA+T require an external Schottky diode, and why?
Yes, the MAX17245ETERA+T requires an external Schottky diode connected between LX and PGND, even though it integrates both high-side and low-side MOSFETs. This is explicitly stated in the Detailed Description section to support the full 3.5A load range and ensure robust operation during light-load PFM mode where the internal low-side FET alone cannot maintain regulation.
MAX17245ETERA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable (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:
- 3.5A
- Frequency - Switching:
- 400kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (5x5)
MAX17245ETERA+T FAQ
1.How can I place an order for MAX17245ETERA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17245ETERA+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 MAX17245ETERA+T reliable?
The price and inventory of MAX17245ETERA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17245ETERA+T is usually 5 days.
3.What payment methods are accepted for MAX17245ETERA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17245ETERA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17245ETERA+T?
MAX17245ETERA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17245ETERA+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 MAX17245ETERA+T?
For technical support, including MAX17245ETERA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17245ETERA+T requirements.
6.How does Aetrix verify that MAX17245ETERA+T is sourced from the original manufacturer or authorized distributors?
All MAX17245ETERA+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 MAX17245ETERA+T meets industry standards.
7.What is the process for return or replacement of MAX17245ETERA+T?
All MAX17245ETERA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17245ETERA+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 MAX17245ETERA+T part is unused and in its original packaging.
Return procedure for MAX17245ETERA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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