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Analog Devices Inc./Maxim Integrated MAX17245ETERB+T
- Part No.:
- MAX17245ETERB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX17245ETERB+T.pdf
- Description:
- IC REG BCK PROG/1V 3.5A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,602
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Product details
Overview
MAX17245ETERB+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 resistor divider, features 28µA quiescent current in PFM mode, and includes 42V transient protection - ideal for automotive power supplies and industrial point-of-load regulation.
For engineers reviewing the MAX17245ETERB+T datasheet, MAX17245ETERB+T pinout, MAX17245ETERB+T application, or MAX17245ETERB+T equivalent, key selection considerations 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 across load range.
Technical Context
The MAX17245ETERB+T employs current-mode control with selectable PWM or PFM operation: PWM maintains constant 220kHz–2.2MHz frequency for EMI-sensitive RF transceiver supplies, while PFM disables negative inductor current and skips pulses at light loads to achieve >90% peak efficiency and 5µA shutdown current. Its internal 5V BIAS LDO powers control circuitry and enables startup from 3.5V inputs.
It integrates protection including cycle-by-cycle current limiting (4.2A–6.2A peak LX limit), thermal shutdown at +175°C with 15°C hysteresis, overvoltage protection at 105% VFB, and soft-start with fixed 8ms ramp. The SYNCOUT pin provides 180° out-of-phase clock for cascading multiple converters without external phase-shift circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V; withstands 42V transients ≤1s - supports cold-crank automotive and wide-input industrial rails. |
| Output Current | Up to 3.5A continuous; peak LX current limit 4.2–6.2A - enables robust point-of-load delivery without external current sense. |
| Quiescent Current | 28µA typical in PFM no-load mode - extends battery life in always-on systems like telematics or IoT sensors. |
| Switching Frequency | 220kHz–2.2MHz, resistor-programmable via FOSC pin - allows optimization of inductor size, core loss, and EMI filtering. |
| Output Voltage Accuracy | ±2% for fixed 3.3V/5V; ±1% for adjustable 1V–10V (VFB = 1.00V ±15mV) - ensures stable MCU core or analog supply regulation. |
| Efficiency | >90% peak efficiency at full load - reduces thermal stress and eliminates need for heatsinks in compact TQFN-16 packages. |
| Duty Cycle Max | 98% - sustains regulation during undervoltage transients (e.g., automotive cranking down to 6V). |
Pinout & Package
The MAX17245ETERB+T is packaged in a 5mm × 5mm, 16-pin TQFN with exposed pad (EP), rated for -40°C to +85°C operation. Thermal resistance θJA = 35°C/W (multilayer board), enabling 2.286W dissipation at +70°C ambient before derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – SYNCOUT | Open-drain clock output | 180° out-of-phase signal relative to internal oscillator; enables synchronized multi-rail designs with minimal external components. |
| 2 – FSYNC | Mode select & sync input | Logic-level control: AGND = PFM; BIAS or external clock = forced-PWM; supports external sync up to ±20% frequency deviation. |
| 3 – FOSC | Frequency programming input | Resistor-to-AGND sets fSW (220kHz–2.2MHz); enables precise EMI tuning and layout optimization. |
| 4 – OUT | Power output node | Switching regulator output; also powers internal circuitry when VOUT = 3–5V in standby - simplifies biasing. |
| 5 – FB | Feedback input | Senses output voltage via resistive divider; 1.00V reference enables accurate 1V–10V adjustment or direct connection to BIAS for 5V fixed. |
| 6 – COMP | Error amplifier output | Connects to RC compensation network; stabilizes loop response across line/load/temperature variations. |
| 7 – BIAS | Internal LDO output | 5V ±0.3V regulated supply for internal logic; requires 1µF ceramic bypass to AGND for noise immunity. |
| 8 – AGND | Analog ground reference | Separate ground for feedback, compensation, and oscillator - minimizes noise coupling into sensitive analog blocks. |
| 9 – EN | Enable input | High-voltage compatible (up to 42V); enables direct connection to KL30 or CAN transceiver INH pin for system-level power sequencing. |
| 10 – SUP | Main supply input | Powers internal LDO; requires 4.7µF ceramic bypass - decouples logic supply from noisy input rail. |
| 11 – SUPSW | Switch supply input | Powers gate drivers; bypassed with 0.1µF + 4.7µF ceramics - ensures clean high-side drive under fast load transients. |
| 12 – LX | Switching node | Connects to inductor and Schottky diode cathode; slew-rate auto-adjusted (4ns/8ns) based on fSW to minimize EMI. |
| 13–14 – PGND | Power ground | Low-impedance return path for high-current switch paths; must be connected to EP for thermal performance. |
| 15 – PGOOD | Open-drain power-good | Active-low flag asserting at 95% VFB, deasserting at 92% - simplifies power sequencing in multi-rail systems. |
| 16 – EP | Exposed thermal pad | Must connect to large-area contiguous copper plane tied to PGND - critical for achieving θJA = 35°C/W rating. |
Key Features
| Feature | Design Value |
|---|---|
| All-ceramic capacitor support | Enables ultra-compact PCB layout with no electrolytic or tantalum capacitors required for input/output filtering. |
| Integrated high- and low-side MOSFETs | Eliminates external power switches and associated gate-drive complexity; RDS(on) = 100mΩ (HS) / 1.5Ω (LS) ensures high efficiency at 3.5A. |
| Automatic LX slew-rate adjustment | Optimizes EMI by switching HSFET in 4ns (fSW > 1.1MHz) or 8ns (fSW < 1.1MHz) - no manual layout tuning needed. |
| Spread-spectrum modulation (factory-enabled) | ±6% frequency dither centered on fOSC with 110µs period at 2.2MHz - reduces peak EMI without sacrificing regulation. |
| 180° out-of-phase SYNCOUT | Enables interleaved multi-phase operation with identical MAX17245 devices - doubles effective ripple frequency and cuts output capacitance by ~50%. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powers SoC, DDR memory, and display interface in head-unit systems with 12V/24V battery input and cold-crank transients. IC Role / Device Role / Timing Role: Primary buck regulator delivering [email protected] with 42V transient tolerance and 8ms soft-start to limit inrush. Use Value: Eliminates need for pre-regulator stage; 28µA quiescent current meets ISO 8859-3 sleep-mode requirements. | Use Scenario: Supplies isolated 3.3V logic rails for digital I/O channels in DIN-rail mounted controllers operating from 24V DC field bus. IC Role / Device Role / Timing Role: Point-of-load converter with PGOOD signaling for FPGA configuration sequencing and fault reporting. Use Value: ±2% output accuracy ensures reliable logic-level margin; TQFN package fits dense I/O carrier boards. |
| RF Transceiver Power Management | Medical Portable Diagnostic Device |
Use Scenario: Powers LTE/Wi-Fi radio modules requiring strict EMI compliance and stable 3.3V supply under dynamic transmit/receive load profiles. IC Role / Device Role / Timing Role: Fixed-frequency forced-PWM regulator synchronized to baseband clock via FSYNC to suppress switching noise in RF bands. Use Value: Spread-spectrum + forced-PWM eliminates frequency-hopping artifacts; 2.2MHz operation shrinks filter size. | Use Scenario: Battery-powered ultrasound probe with real-time signal processing, requiring low-noise 1.8V/3.3V rails and long standby duration. IC Role / Device Role / Timing Role: Dual-output buck (via cascade) generating 3.3V main rail and 1.8V core rail using adjustable FB and SYNCOUT phase alignment. Use Value: 5µA shutdown current extends battery life; PFM mode maintains >85% efficiency at µA-level sensor bias currents. |
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 phase shift. | Higher current capacity but lacks 180° SYNCOUT for interleaving and dedicated BIAS rail for simplified biasing. | Select LM61480RQR only if >3.5A output or lower IQ is mandatory; MAX17245ETERB+T preferred for phase-synchronized multi-rail or BIAS-dependent auxiliary supplies. |
| TPS54560BQDDARQ1 | 3.5V–60V input, 5A output, 100kHz–2.5MHz fSW, 14µA IQ; no spread-spectrum, no PGOOD, no BIAS LDO. | Broader input range suits 48V industrial systems but lacks integrated power-good monitoring and EMI-reduction features. | Choose TPS54560BQDDARQ1 for high-VIN (>36V) applications where PGOOD and spread-spectrum are non-critical; MAX17245ETERB+T better for automotive EMI compliance and sequencing. |
Compared with LM61480RQR and TPS54560BQDDARQ1, the MAX17245ETERB+T uniquely combines 42V transient protection, integrated 5V BIAS LDO, 180° SYNCOUT for interleaving, and factory-enabled spread-spectrum - making it optimal for space-constrained, EMI-sensitive, multi-rail automotive and industrial designs where component count and layout simplicity are critical.
Availability
MAX17245ETERB+T is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and RF transceiver power supplies requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.
Supply support for MAX17245ETERB+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 MAX17245 is part of Maxim's high-efficiency synchronous buck converter family targeting compact, low-quiescent-power DC-DC solutions for automotive and industrial point-of-load regulation with stringent EMI and transient requirements.
FAQ
What is the maximum input voltage transient rating for the MAX17245ETERB+T?
The MAX17245ETERB+T is rated for 42V input transients lasting less than 1 second. This specification is validated per Absolute Maximum Ratings and supports automotive cold-crank and load-dump conditions without external clamping. Operation above 36V DC is not permitted, but brief transients up to 42V are tolerated - a key differentiator for 12V/24V vehicle systems. The device remains functional during such events due to internal protection circuitry.
Does the MAX17245ETERB+T require an external Schottky diode?
Yes, the MAX17245ETERB+T requires an external Schottky diode connected between LX and PGND. Although it integrates high-side and low-side MOSFETs, the datasheet explicitly states the low-side MOSFET enables forced-PWM operation but does not eliminate the need for the external diode across the full load range. This diode supports light-load PFM operation and improves efficiency in discontinuous conduction mode - a design requirement confirmed in the Detailed Description and Typical Application Circuit.
How is the output voltage set to 5V on the MAX17245ETERB+T?
To set the MAX17245ETERB+T output to 5V, connect the FB pin directly to the BIAS pin. This configuration leverages the internal 1.00V feedback reference and the BIAS regulator's 5V output to establish a precise 5V output with ±2% accuracy. No external resistors are needed - a hardware-configurable option distinct from the adjustable 1V–10V mode that uses an external resistor divider from OUT to FB to AGND.
What is the purpose of the SYNCOUT pin on the MAX17245ETERB+T?
The SYNCOUT pin on the MAX17245ETERB+T provides an open-drain 180° out-of-phase clock signal relative to the internal oscillator. It enables cascaded or interleaved power supply configurations with identical MAX17245 devices - doubling effective ripple frequency and reducing output capacitor requirements. When used with an external pull-up resistor (100Ω–1kΩ), SYNCOUT drives the EN or FSYNC pin of a second converter to achieve phase opposition without external timing ICs.
Can the MAX17245ETERB+T operate in dropout mode, and what is its maximum duty cycle?
Yes, the MAX17245ETERB+T operates in dropout mode with a maximum duty cycle of 98%. This allows regulation when input voltage approaches output voltage - critical during automotive cranking events where battery voltage may dip to 6V while powering a 5V rail. The 98% duty cycle is a hard limit enforced by internal timing control and is verified across temperature and process corners per Electrical Characteristics tables.
MAX17245ETERB+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)
MAX17245ETERB+T FAQ
1.How can I place an order for MAX17245ETERB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17245ETERB+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 MAX17245ETERB+T reliable?
The price and inventory of MAX17245ETERB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17245ETERB+T is usually 5 days.
3.What payment methods are accepted for MAX17245ETERB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17245ETERB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17245ETERB+T?
MAX17245ETERB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17245ETERB+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 MAX17245ETERB+T?
For technical support, including MAX17245ETERB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17245ETERB+T requirements.
6.How does Aetrix verify that MAX17245ETERB+T is sourced from the original manufacturer or authorized distributors?
All MAX17245ETERB+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 MAX17245ETERB+T meets industry standards.
7.What is the process for return or replacement of MAX17245ETERB+T?
All MAX17245ETERB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17245ETERB+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 MAX17245ETERB+T part is unused and in its original packaging.
Return procedure for MAX17245ETERB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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