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Analog Devices Inc./Maxim Integrated MAX17245ETERA+
- Part No.:
- MAX17245ETERA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX17245ETERA+.pdf
- Description:
- IC REG BCK PROG/1V 3.5A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,907
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Product details
Overview
MAX17245ETERA+ 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 resistor divider, features 28µA quiescent current in standby, 98% max duty cycle for dropout operation, and 220kHz–2.2MHz programmable switching frequency. It is used in distributed power regulation for industrial control systems requiring robust transient protection and EMI control.
For engineers reviewing the MAX17245ETERA+ datasheet, MAX17245ETERA+ pinout, MAX17245ETERA+ application, or MAX17245ETERA+ equivalent, key selection criteria include input transient rating (42V), PFM/PWM mode flexibility, spread-spectrum EMI reduction, power-good signaling, and 180° out-of-phase SYNCOUT for cascaded supplies.
Technical Context
The MAX17245ETERA+ uses current-mode control with selectable PWM or PFM operation: PWM maintains constant 220kHz–2.2MHz frequency across load, while PFM disables negative inductor current and skips pulses at light loads to achieve >90% peak efficiency. Its internal 5V BIAS LDO powers control circuitry and enables startup from 3.5V inputs.
It integrates cycle-by-cycle current limiting, thermal shutdown with 15°C hysteresis, overvoltage protection (105% VFB trip), and automatic LX slew-rate adjustment-4ns rise time above 1.1MHz, 8ns below-to optimize EMI without sacrificing efficiency. The FSYNC pin selects mode (AGND = PFM; BIAS/external clock = forced-PWM), and SYNCOUT provides 180° out-of-phase clock for multi-rail synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 3.5V to 36V; withstands 42V transients for ≤1s-enables use behind automotive cold-crank or industrial unregulated rails. |
| Output current | Up to 3.5A continuous; peak LX current limit 4.2–6.2A-supports mid-power PoL applications without external current sensing. |
| Quiescent current | 28µA typical at no load (VOUT = 5V); 5µA in shutdown-extends battery life in always-on systems. |
| Switching frequency | 220kHz–2.2MHz, resistor-programmable (RFOSC) or externally synchronized-allows trade-off between size (higher fSW) and efficiency (lower fSW). |
| Output voltage options | Fixed 3.3V/5V (±2%) or adjustable 1V–10V via FB divider-supports diverse logic supply requirements without external DAC. |
| Thermal performance | TQFN package: θJA = 35°C/W; junction-to-case θJC = 2.7°C/W-enables 3.5A operation with minimal heatsinking on 4-layer PCB. |
| Protection features | Cycle-by-cycle current limit, thermal shutdown (175°C), OVP (105% VFB), soft-start (8ms)-ensures reliable startup and fault recovery in harsh environments. |
Pinout & Package
The MAX17245ETERA+ is housed in a 16-pin 5mm × 5mm TQFN package with exposed pad (EP), rated for –40°C to +85°C operation. Thermal resistance is θJA = 35°C/W (JEDEC 51, multilayer board). EP must be soldered to a large-area contiguous PGND copper plane for effective heat dissipation and cannot serve as sole ground connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNCOUT) | Open-drain clock output | 180° out-of-phase to internal oscillator; requires 100Ω–1kΩ pull-up to OUT for 2MHz sync-enables interleaved multi-phase buck designs. |
| 2 (FSYNC) | Mode select & sync input | Logic input: AGND = PFM; BIAS/external clock = forced-PWM-determines light-load behavior and EMI profile. |
| 3 (FOSC) | Frequency programming node | Connect resistor to AGND to set fSW (e.g., 12kΩ = 2.2MHz); enables precise EMI tuning and inductor sizing. |
| 4 (OUT) | Power output & internal supply | Delivers regulated output; powers internal circuitry when VOUT ≥ 3V-eliminates need for separate bias rail in many designs. |
| 5 (FB) | Feedback input | Connects to resistive divider (1V reference) or directly to BIAS for fixed 5V-defines regulation point with ±0.015V accuracy. |
| 6 (COMP) | Error amplifier output | Drives external RC compensation network-stabilizes loop response across input/output/load variations. |
| 7 (BIAS) | Internal LDO output | 5V ±0.3V, 10mA capable; bypassed with 1µF ceramic-powers gate drivers and analog blocks independently of VOUT. |
| 8 (AGND) | Analog ground reference | Separate from PGND; connects to COMP, FB, FOSC-minimizes noise coupling into sensitive feedback path. |
| 9 (EN) | Enable input | High-voltage compatible (up to 42V); 2.4V threshold-allows direct connection to KL30 or CAN transceiver INH pins. |
| 10 (SUP) | Main logic supply input | Powers internal LDO; bypassed with 4.7µF ceramic-requires RC filter placeholder for noise-sensitive applications. |
| 11 (SUPSW) | Switch driver supply | Powers high-side gate driver; bypassed with 0.1µF + 4.7µF ceramics-critical for stable switching under high dV/dt. |
| 12,13 (LX) | Switching node | Connects to inductor and Schottky diode cathode; requires BST capacitor (0.1µF) to LX-carries full AC switching current (3.5A RMS). |
| 14 (PGND) | Power ground return | Low-impedance return for LX, SUPSW, CIN-must be connected separately from AGND to avoid ground bounce. |
| 15 (PGOOD) | Open-drain power-good | Active-low signal asserting at 95% VFB, deasserting at 92%-simplifies power sequencing with µC or FPGA. |
| 16 (EP) | Exposed thermal pad | Must be soldered to PGND plane; not electrically functional as signal-primary thermal path for 2.286W dissipation at 70°C ambient. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side MOSFETs | Reduces BOM count by eliminating external switches; RDS(on) = 100–220mΩ (HS), 1.5–3Ω (LS)-enables compact, high-efficiency 3.5A design. |
| All-ceramic capacitor support | Eliminates electrolytic capacitors; allows ultra-small footprint with 2.2µH inductor and 22µF output ceramic-reduces height and improves lifetime. |
| Spread-spectrum modulation (S-version) | ±6% frequency dither centered on fOSC-lowers peak EMI by >10dB without altering layout or filtering components. |
| Automatic LX slew-rate control | 4ns rise time at >1.1MHz, 8ns at <1.1MHz-optimizes EMI vs. efficiency trade-off automatically per selected switching frequency. |
| 180° out-of-phase SYNCOUT | Enables two MAX17245ETERA+ devices to operate interleaved-cuts input/output ripple current by ~70%, reducing capacitor stress and size. |
Applications
| Industrial PLC Power Rails | Automotive Body Control Module |
|---|---|
Use Scenario: Providing isolated 5V/3.5A rails for microcontrollers, I/O drivers, and CAN transceivers in programmable logic controllers. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24V industrial bus to clean 5V logic supply with tight ripple and fast transient response. Use Value: 42V transient tolerance prevents brownouts during relay switching; PGOOD enables safe firmware boot sequencing; 28µA quiescent current meets low-power sleep requirements. | Use Scenario: Generating 3.3V/3.5A for infotainment SoCs and sensor hubs in body control modules powered from 12V battery with cold-crank dips. IC Role / Device Role / Timing Role: High-efficiency buck converter operating down to 3.5V input, maintaining regulation during cranking events via 98% duty cycle. Use Value: EN pin's 42V rating allows direct KL30 connection; spread-spectrum reduces radiated emissions near AM/FM antennas; thermal shutdown ensures reliability under hood temperatures. |
| RF Transceiver Power Supply | Point-of-Load for FPGA Core Voltage |
Use Scenario: Delivering low-noise 5V supply to LTE/5G RF transceivers where spectral purity and EMI compliance are critical. IC Role / Device Role / Timing Role: Fixed-frequency forced-PWM regulator synchronized to baseband clock via FSYNC-eliminates switching frequency variation that could mix into RF bands. Use Value: Synchronization capability and ±6% spread-spectrum (S-version) meet CISPR-22 Class B limits; 2.2MHz operation minimizes filter size. | Use Scenario: Regulating 1.2V/3.5A for FPGA core logic from a 12V intermediate bus in telecom base station equipment. IC Role / Device Role / Timing Role: Adjustable-output buck converter using FB divider to set precise 1.2V with ±2% tolerance across temperature and load. Use Value: 1V FB reference enables accurate low-VOUT setting; current-mode control delivers <10µs transient response to FPGA dynamic load steps. |
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 spread-spectrum, different pinout | Higher current, lower IQ, but lacks SYNCOUT, PGOOD, and 180° phase shift-unsuitable for interleaving or strict sequencing. | Select LM61480RQR only if >5A output or sub-20µA IQ is mandatory; MAX17245ETERA+ preferred for EMI-sensitive, multi-rail, or sequencing-critical designs. |
| TPS543620RJER | 3.5V–36V input, 3.5A output, 2.2MHz max fSW, 25µA IQ, no PFM mode, no spread-spectrum, different compensation | Similar current/voltage specs but fixed PWM-only operation-cannot achieve MAX17245ETERA+'s light-load efficiency or EMI flexibility. | Choose TPS543620RJER for cost-sensitive, fixed-frequency-only applications; MAX17245ETERA+ remains superior for adaptive efficiency and EMI control. |
Compared with LM61480RQR and TPS543620RJER, the MAX17245ETERA+ uniquely combines PFM/PWM mode selection, 180° SYNCOUT for interleaving, spread-spectrum EMI reduction, and integrated PGOOD-all in a 5mm × 5mm TQFN-making it optimal for space-constrained, noise-sensitive, and multi-rail industrial or automotive power systems.
Availability
MAX17245ETERA+ is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, RF transceiver power supplies, and FPGA point-of-load applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX17245ETERA+ 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, and communications markets.
The MAX17245ETERA+ belongs to Maxim's high-efficiency synchronous buck converter product line, engineered for wide-input industrial and automotive power conversion where transient robustness, low quiescent current, and EMI control are critical.
FAQ
What is the maximum input voltage transient rating for the MAX17245ETERA+?
The MAX17245ETERA+ is rated for 42V input transients lasting less than 1 second. This protection allows reliable operation in automotive and industrial environments where load-dump or inductive kick events occur. The device sustains this rating without external clamping components, simplifying design and improving system robustness compared to converters requiring TVS diodes.
Can the MAX17245ETERA+ operate in dropout mode, and what is its maximum duty cycle?
Yes, the MAX17245ETERA+ operates in dropout mode with a maximum duty cycle of 98%. This enables regulation even when input voltage drops close to the output voltage-critical during automotive cold-crank conditions (e.g., 6V input → 5V output). The high duty cycle is achieved without external components and maintains regulation accuracy within ±2% for fixed outputs.
How does the FSYNC pin affect the operating mode of the MAX17245ETERA+?
The FSYNC pin selects between PFM and forced-PWM modes: connecting FSYNC to AGND enables PFM for highest light-load efficiency, while connecting to BIAS or an external clock forces fixed-frequency PWM to minimize EMI variability. The MAX17245ETERA+ synchronizes to external clocks within one cycle and reverts to internal oscillation if the clock is absent for >2 cycles.
What is the purpose of the SYNCOUT pin on the MAX17245ETERA+, and how is it used?
The SYNCOUT pin on the MAX17245ETERA+ provides an open-drain 180° out-of-phase clock signal relative to the internal oscillator. It is used to interleave multiple MAX17245ETERA+ devices-reducing input/output ripple current and capacitor stress. A 100Ω–1kΩ pull-up resistor to OUT sets the output level; no additional driver circuitry is needed.
Does the MAX17245ETERA+ require an external Schottky diode, and why?
Yes, the MAX17245ETERA+ requires an external Schottky diode connected between LX and PGND. Although it integrates low-side MOSFETs for synchronous rectification, the datasheet explicitly states the diode is necessary to support the full 3.5A load range-particularly in PFM mode and during transient conditions where body diode conduction or timing limitations may occur.
MAX17245ETERA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX17245ETERA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17245ETERA+ 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+ reliable?
The price and inventory of MAX17245ETERA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17245ETERA+ is usually 5 days.
3.What payment methods are accepted for MAX17245ETERA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17245ETERA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17245ETERA+?
MAX17245ETERA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17245ETERA+ 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+?
For technical support, including MAX17245ETERA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17245ETERA+ requirements.
6.How does Aetrix verify that MAX17245ETERA+ is sourced from the original manufacturer or authorized distributors?
All MAX17245ETERA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX17245ETERA+?
All MAX17245ETERA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17245ETERA+, 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+ part is unused and in its original packaging.
Return procedure for MAX17245ETERA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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