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Analog Devices Inc./Maxim Integrated MAX17245ETESB+T
- Part No.:
- MAX17245ETESB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX17245ETESB+T.pdf
- Description:
- IC REG BCK PROG/1V 3.5A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,152
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Product details
Overview
MAX17245ETESB+T from Maxim Integrated is a 3.5A, synchronous step-down DC-DC converter with integrated high-side and low-side MOSFETs, operating from 3.5V to 36V input and delivering fixed 3.3V/5V or adjustable 1V–10V output. It features 28µA quiescent current, 98% max duty cycle for dropout operation, and 220kHz–2.2MHz resistor-programmable switching frequency. Used in distributed power regulation for industrial control systems requiring stable 5V at 3.5A.
For engineers reviewing the MAX17245ETESB+T datasheet, MAX17245ETESB+T pinout, MAX17245ETESB+T application, or MAX17245ETESB+T equivalent, key selection criteria include input transient tolerance (42V), PFM/PWM mode flexibility via FSYNC, ±2% output accuracy at 5V/3.3V, spread-spectrum EMI reduction, and thermal shutdown with automatic recovery.
Technical Context
The MAX17245ETESB+T employs current-mode control with selectable PWM or PFM operation: PWM ensures constant-frequency switching across all loads, 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 supports external biasing of EN and FSYNC.
It integrates protection features including cycle-by-cycle current limiting (ILX = 4.2–6.2A), overvoltage protection (102–105% VFB), thermal shutdown at +175°C with 15°C hysteresis, and 42V input transient tolerance. The SYNCOUT pin provides 180° out-of-phase clock output for cascading multiple converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports automotive cold-crank and industrial wide-input applications; withstands 42V transients ≤1s. |
| Output Current | Up to 3.5A continuous - enables single-chip point-of-load conversion for FPGA I/O or microcontroller cores. |
| Output Voltage Options | Fixed 3.3V (±2%) or 5V (±2%), or adjustable 1V–10V via FB resistive divider - allows flexible rail generation without external DAC. |
| Quiescent Current | 28µA typical at no load - extends battery life in always-on industrial sensors and IoT edge nodes. |
| Switching Frequency | 220kHz–2.2MHz, resistor-programmable (RFOSC) or externally synchronized - permits optimization of size (high-f) vs. efficiency (low-f). |
| Efficiency | >90% peak - achieved via synchronous rectification, ceramic-capacitor compatibility, and automatic LX slew-rate adjustment. |
| Shutdown Current | 5µA typical - enables ultra-low-power system-level sleep modes with fast wake-up. |
Pinout & Package
MAX17245ETESB+T is packaged in a 16-pin 5mm × 5mm TQFN with exposed pad (EP), optimized for thermal performance (θJA = 35°C/W on multilayer board). EP must be connected to PGND via large-area copper for effective heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – SYNCOUT | Open-drain clock output | Provides 180° out-of-phase signal relative to internal oscillator; enables cascaded buck stages for higher power or interleaved ripple cancellation. |
| 2 – FSYNC | Mode-select & sync input | Logic-controlled: AGND = PFM (light-load efficiency); BIAS or external clock = forced-PWM (EMI control); synchronizes within 1 cycle. |
| 3 – FOSC | Frequency-setting input | Resistor-to-AGND sets fSW from 220kHz to 2.2MHz; enables design trade-off between inductor size and switching loss. |
| 4 – OUT | Power output node | Delivers regulated output; also supplies internal circuitry when VOUT = 3–5V during standby - eliminates need for separate bias rail. |
| 5 – FB | Feedback input | Monitors output via resistive divider; 1.0V reference enables precise 1V–10V programming or direct connection to BIAS for fixed 5V. |
| 6 – COMP | Error amplifier output | Connects to RC compensation network; stabilizes loop response for varied output capacitor ESR and load conditions. |
| 7 – BIAS | Internal LDO output | 5V ±0.3V regulated supply for internal logic; bypassed with 1µF ceramic cap; powers EN, FSYNC, and FB circuitry. |
| 8 – AGND | Analog ground reference | Separate from PGND to minimize noise coupling into feedback and compensation paths; must be tied to PGND at single point. |
| 9 – EN | Enable input | High-voltage compatible (up to 42V); asserts device above 2.4V, deasserts below 0.6V; supports direct connection to automotive KL30 or CAN INH. |
| 10 – SUP | Main supply input | Powers internal BIAS LDO; requires 4.7µF ceramic bypass; recommended RC filter placement reduces logic supply noise. |
| 11 – SUPSW | Switch supply input | Powers gate drivers and high-side MOSFET; bypassed with 0.1µF + 4.7µF ceramics; isolated from SUP for improved noise immunity. |
| 12,13 – LX | Switching node | Connects to inductor and Schottky diode cathode; internal high-side/low-side MOSFETs switch here; requires BST capacitor (0.1µF) to LX. |
| 14 – PGND | Power ground | Low-impedance return path for high-current LX switching; must connect EP and all power caps directly to this node. |
| 15 – PGOOD | Open-drain power-good | Active-low flag asserting when VOUT ≥95% regulation; deasserts at ≤92%; used for sequencing with 10kΩ pull-up to BIAS. |
| 16 – EP | Exposed thermal pad | Not electrically functional alone; must be soldered to solid PGND copper pour for thermal conduction and mechanical stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side MOSFETs | Eliminates external switches and reduces BOM count; RON_H = 100–220mΩ and RON_L = 1.5–3Ω enable >90% efficiency without external drive complexity. |
| All-ceramic capacitor support | Enables ultra-compact layout using only MLCCs for CIN, COUT, CBIAS, and CBST; removes bulk electrolytics and improves reliability and temperature stability. |
| Automatic LX slew-rate adjustment | Configures HSFET turn-on time to 4ns (fSW >1.1MHz) or 8ns (fSW <1.1MHz); minimizes EMI without sacrificing efficiency across full frequency range. |
| Spread-spectrum modulation (factory-enabled) | ±6% frequency dither centered on fOSC with 110µs period at 2.2MHz; reduces peak EMI amplitude by spreading energy across spectrum. |
| 180° out-of-phase SYNCOUT | Enables two MAX17245ETESB+T devices to operate interleaved - cuts input/output ripple current by ~50% and eases filtering requirements. |
Applications
| Industrial PLC Power Rails | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Providing clean, regulated 5V for microcontroller, CAN transceiver, and sensor interface in programmable logic controller backplane. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 12V/24V vehicle or field bus to stable 5V at up to 3.5A. Use Value: 42V transient protection prevents latch-up during load-dump events; 28µA quiescent current meets automotive sleep-mode requirements. |
Use Scenario: Generating 3.3V for MCU core and peripherals in body electronics modules with strict EMI limits near RF antennas. IC Role / Device Role / Timing Role: Synchronous buck converter operating in forced-PWM mode via FSYNC to maintain fixed 2.2MHz switching for predictable noise spectrum. Use Value: Spread-spectrum option and 180° SYNCOUT enable dual-phase interleaving - reducing conducted EMI by >10dB at fundamental frequency. |
| IoT Edge Node Power Supply | Test & Measurement Equipment |
|
Use Scenario: Battery-backed remote sensor node requiring long operational life and reliable startup under low-input conditions. IC Role / Device Role / Timing Role: Wide-input (3.5V–36V) buck converter supporting LiFePO4, 12V wall adapter, or solar input; operates in PFM mode at light loads. Use Value: 98% max duty cycle sustains regulation during brownouts; 5µA shutdown current preserves battery charge during extended idle periods. |
Use Scenario: Precision analog subsystem requiring ultra-stable 5V rail with minimal switching noise coupling into ADC references or op-amp supplies. IC Role / Device Role / Timing Role: Low-noise, high-PSRR buck regulator with dedicated AGND/PGND separation and BIAS-powered feedback path. Use Value: ±2% output accuracy and <0.5% load regulation ensure voltage stability across dynamic load steps; soft-start (8ms) prevents overshoot during power-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQWR | 3.6V–36V input, 8A output, 2.1MHz max fSW, 15µA IQ; no integrated BIAS LDO or SYNCOUT; uses external BOOT capacitor. | Higher current capacity but lacks 180° clock output and integrated bias rail - unsuitable for cascaded or ultra-low-IQ designs. | Select LM61480RQWR only when >5A output or lower cost per amp is prioritized over BIAS integration and sequencing simplicity. |
| TPS54561RGTR | 3.5V–60V input, 5A output, 100kHz–2.5MHz fSW, 12µA IQ; no spread-spectrum or PFM mode; requires external bootstrap diode. | Wider VIN range and higher current, but no PFM light-load mode or factory spread-spectrum - less optimal for EMI-sensitive RF systems. | Choose TPS54561RGTR for high-VIN industrial applications where 60V rating is mandatory and EMI is managed externally. |
Compared with LM61480RQWR and TPS54561RGTR, the MAX17245ETESB+T uniquely combines integrated BIAS LDO, 180° SYNCOUT, PFM/PWM mode selection via FSYNC, and factory spread-spectrum - making it optimal for compact, low-noise, multi-rail embedded power systems requiring coordinated timing and ultra-low standby consumption.
Availability
MAX17245ETESB+T is available at Aetrix Electronics and suitable for industrial PLC power rails, automotive body control modules, and IoT edge node power supplies requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX17245ETESB+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 MAX17245ETESB+T belongs to Maxim's high-efficiency synchronous buck converter family, engineered for wide-input industrial and automotive power supplies where reliability, low IQ, and EMI control are critical.
FAQ
What is the maximum input voltage transient tolerance for MAX17245ETESB+T?
The MAX17245ETESB+T supports 42V input transients for durations under 1 second, as specified in its Absolute Maximum Ratings. This protects against automotive load-dump events and industrial line surges without requiring external TVS clamping. Operation remains functional during these transients, and the device resumes normal regulation once input returns within 3.5V–36V range. The 42V rating applies to both SUP and SUPSW pins.
Can MAX17245ETESB+T operate with only ceramic capacitors?
Yes, MAX17245ETESB+T is fully compatible with all-ceramic capacitor designs. Its control loop and compensation architecture are optimized for low-ESR MLCCs at input (CIN), output (COUT), bias (CBIAS), and bootstrap (CBST) positions. The datasheet confirms stable operation with 4.7µF input and 22µF output ceramic capacitors, enabling smaller footprint, higher reliability, and better temperature performance versus electrolytic solutions.
How does the FSYNC pin control operating mode in MAX17245ETESB+T?
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 (1.8–2.6MHz) forces fixed-frequency PWM to suppress EMI variability. The device synchronizes to an external clock within one cycle and reverts to internal oscillation if the clock is absent for >2 cycles. No external components are needed beyond the logic-level connection.
What is the purpose of the SYNCOUT pin on MAX17245ETESB+T?
The SYNCOUT pin on MAX17245ETESB+T provides an open-drain 180° out-of-phase clock signal relative to the internal oscillator. It enables precise interleaving of two or more MAX17245ETESB+T devices - reducing input and output ripple current by up to 50%, easing filter design, and lowering RMS losses in shared input/output capacitors. A 100Ω–1kΩ pull-up resistor to BIAS sets the output level for cascaded synchronization.
Does MAX17245ETESB+T include overvoltage protection?
Yes, MAX17245ETESB+T includes internal overvoltage protection (OVP) that triggers when the FB pin voltage exceeds 105% of the regulation setpoint (e.g., 5.25V for 5V output). Upon detection, the high-side switch turns off and the low-side switch activates until negative current limit is reached, then both switches disable. Recovery occurs automatically after fault clearance. OVP threshold is fixed and non-adjustable, ensuring robust protection without external components.
MAX17245ETESB+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)
MAX17245ETESB+T FAQ
1.How can I place an order for MAX17245ETESB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17245ETESB+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 MAX17245ETESB+T reliable?
The price and inventory of MAX17245ETESB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17245ETESB+T is usually 5 days.
3.What payment methods are accepted for MAX17245ETESB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17245ETESB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17245ETESB+T?
MAX17245ETESB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17245ETESB+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 MAX17245ETESB+T?
For technical support, including MAX17245ETESB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17245ETESB+T requirements.
6.How does Aetrix verify that MAX17245ETESB+T is sourced from the original manufacturer or authorized distributors?
All MAX17245ETESB+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 MAX17245ETESB+T meets industry standards.
7.What is the process for return or replacement of MAX17245ETESB+T?
All MAX17245ETESB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17245ETESB+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 MAX17245ETESB+T part is unused and in its original packaging.
Return procedure for MAX17245ETESB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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