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Analog Devices Inc./Maxim Integrated MAX17245ETESA+T
- Part No.:
- MAX17245ETESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX17245ETESA+T.pdf
- Description:
- IC REG BCK PROG/1V 3.5A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,167
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Product details
Overview
MAX17245ETESA+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 with 42V transient protection. It delivers up to 3.5A output current, supports fixed 3.3V/5V outputs (±2% accuracy), and enables adjustable 1V–10V outputs via external resistor divider. It is used in distributed power regulation for industrial control systems requiring stable, low-noise 5V rails.
For engineers reviewing the MAX17245ETESA+T datasheet, MAX17245ETESA+T pinout, MAX17245ETESA+T application, or MAX17245ETESA+T equivalent, key selection criteria include its 28µA quiescent current, 220kHz–2.2MHz programmable switching frequency, PFM/PWM mode selectability via FSYNC, 98% max duty cycle for dropout operation, and TQFN-16 (5mm × 5mm) package with exposed pad.
Technical Context
The MAX17245ETESA+T uses current-mode control architecture with selectable PWM or PFM operation. Its internal 5V BIAS regulator powers analog circuitry, while the FSYNC pin determines light-load behavior: AGND enables PFM for ultra-low IQ, and BIAS/external clock enables forced-PWM for EMI-critical RF supply applications.
It integrates cycle-by-cycle current limiting, thermal shutdown with 15°C hysteresis, overvoltage protection at 105% VFB, and spread-spectrum modulation (±6%) on factory-enabled S-versions. 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 - enables robust operation in automotive cold-crank and industrial 24V bus environments. |
| Output Current | Up to 3.5A continuous - supports mid-power point-of-load conversion for microcontrollers and sensors. |
| Quiescent Current | 28µA typical in standby - extends battery life in always-on IoT edge nodes. |
| Switching Frequency | 220kHz to 2.2MHz, resistor-programmable via FOSC pin - allows trade-off between inductor size (higher fSW) and conduction loss (lower fSW). |
| Output Accuracy | ±2% for fixed 3.3V/5V; ±1% for adjustable mode (VFB = 1.00V) - ensures reliable logic-level compliance for FPGA I/O and MCU cores. |
| Duty Cycle Limit | 98% maximum - maintains regulation during severe input undervoltage events (e.g., 5V input → 4.9V output). |
| Thermal Protection | 175°C shutdown with 15°C hysteresis - prevents latch-up under sustained overload or poor PCB heatsinking. |
Pinout & Package
The MAX17245ETESA+T is housed in a 16-pin TQFN package (5mm × 5mm, 0.5mm pitch) with exposed thermal pad (EP) connected to PGND. This package achieves 35°C/W junction-to-ambient thermal resistance on multilayer PCBs, enabling high-power density designs without forced airflow.
| 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 stacks without external delay networks. |
| 2 – FSYNC | Mode-select logic input | AGND = PFM (low IQ); BIAS/external clock = forced-PWM (fixed fSW, EMI-controlled); critical for RF transceiver power supplies. |
| 3 – FOSC | Frequency-setting resistor node | Connects to AGND via RFOSC (e.g., 12kΩ → 2.2MHz); sets switching frequency and enables synchronization to external clocks within ±20% range. |
| 4 – OUT | Power output node | Delivers regulated voltage; also powers internal circuitry when VOUT ≥ 3V during standby - eliminates need for separate bias rail. |
| 5 – FB | Feedback input | Monitors output via resistive divider; connects directly to BIAS for fixed 5V - simplifies design for standard logic rails. |
| 6 – COMP | Error amplifier output | Drives external RC compensation network; stability depends on RCOMP/CCOMP values selected per load and fSW. |
| 7 – BIAS | Integrated 5V LDO output | Powers internal analog blocks; requires 1µF ceramic bypass to AGND - decouples noise from switching node. |
| 8 – AGND | Analog ground reference | Separate from PGND to minimize noise coupling into feedback and error amplifier paths. |
| 9 – EN | Enable input | High-voltage compatible (up to 42V); asserts device when >2.4V - supports direct connection to automotive KL30 or CAN transceiver INH pins. |
| 10 – SUP | Analog supply input | Powers internal LDO; bypassed with 4.7µF ceramic capacitor - filters noise before it reaches BIAS regulator. |
| 11 – SUPSW | Switch supply input | Powers gate drivers; bypassed with 0.1µF + 4.7µF ceramics - ensures clean, low-impedance source for high-side FET turn-on. |
| 12 – LX | Switching node | Connects to inductor and Schottky diode cathode; requires 0.1µF BST capacitor to LX for bootstrap gate drive. |
| 13–14 – PGND | Power ground return | Low-impedance path for inductor current and switch losses; must be tied to EP for thermal performance. |
| 15 – PGOOD | Open-drain power-good flag | Asserts high when VOUT > 95% of regulation; deasserts at 92% - enables precise sequencing with downstream processors and FPGAs. |
| 16 – EP | Exposed thermal pad | Must be soldered to large copper pour connected to PGND - primary thermal path; not a functional signal. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side MOSFETs | Eliminates external switches and reduces BOM count by 4–6 components; enables compact all-ceramic capacitor designs. |
| Programmable 220kHz–2.2MHz switching frequency | Allows optimization for size (high fSW) or efficiency (low fSW) without changing IC; supports EMI filtering at known fundamental frequencies. |
| PFM/PWM mode selection via FSYNC pin | Enables <28µA no-load IQ in PFM or fixed-frequency operation in forced-PWM - meets both battery-life and RF emission requirements. |
| 180° out-of-phase SYNCOUT clock | Permits interleaved multi-converter designs that halve input/output ripple current without external timing ICs or complex layout. |
| 42V input transient protection | Withstands automotive load-dump surges and industrial line transients without external TVS - reduces system-level protection cost. |
| Automatic LX slew-rate adjustment | Optimizes rise time (4ns at >1.1MHz, 8ns at <1.1MHz) to balance EMI reduction and switching loss - no manual tuning required. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Powers 3.3V I/O peripherals and 5V CAN transceivers in programmable logic controllers with 24V DC input. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 3.5A at 5V with tight line/load regulation and fast transient response. Use Value: 98% duty cycle sustains output during brownouts; PGOOD enables safe firmware boot sequencing; 42V tolerance avoids external surge protection. | Use Scenario: Supplies 5V rail to microcontroller, LIN transceiver, and sensor interface in vehicle door modules. IC Role / Device Role / Timing Role: High-efficiency buck converter operating from 9V–16V battery with cold-crank support down to 3.5V. Use Value: 28µA quiescent current minimizes parasitic drain; EN pin accepts KL30 directly; thermal shutdown prevents fault propagation. |
| RF Transceiver Power Management | IoT Edge Node Power System |
Use Scenario: Generates clean 3.3V supply for LTE/5G modem in base station radio units where spectral purity is critical. IC Role / Device Role / Timing Role: Fixed-frequency PWM converter synchronized to system clock via FSYNC to eliminate beat frequencies. Use Value: Forced-PWM mode eliminates frequency variation; spread-spectrum option (S-version) further suppresses narrowband EMI peaks. | Use Scenario: Powers ARM Cortex-M4 MCU, BLE radio, and environmental sensors in battery-operated smart meters. IC Role / Device Role / Timing Role: Ultra-low-IQ buck regulator enabling multi-year operation on coin-cell or Li-SOCl₂ batteries. Use Value: PFM mode draws only 28µA at no load; 98% duty cycle maintains regulation during battery depletion; EN pin enables deep-sleep wake-up control. |
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 capability. | Better suited for higher-current (>5A) industrial motor drives; lacks built-in 180° clock for interleaving. | Select LM61480RQR when output current >3.5A is required and phase-sync features are unnecessary. |
| TPS54560BQDDARQ1 | 3.5V–60V input, 5A output, 100kHz–2.5MHz fSW, 14µA IQ; includes soft-start adjust but no spread-spectrum or automatic slew-rate control. | Designed for automotive AEC-Q100 Grade 1; supports wider input range but lacks BIAS-regulated internal supply. | Choose TPS54560BQDDARQ1 for automotive under-hood applications requiring 60V rating and AEC-Q100 qualification. |
Compared with LM61480RQR and TPS54560BQDDARQ1, the MAX17245ETESA+T uniquely integrates a 5V BIAS LDO, 180° SYNCOUT for multi-phase stacking, and automatic LX slew-rate tuning - making it optimal for space-constrained, EMI-sensitive, or multi-rail embedded systems where component count and layout simplicity are prioritized over raw current headroom or extended input voltage.
Availability
MAX17245ETESA+T is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive body control modules, RF transceiver power management, and IoT edge node power systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX17245ETESA+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 belongs to Maxim's high-efficiency synchronous buck converter product line, engineered for wide-input industrial and automotive power supplies where low quiescent current, transient robustness, and EMI control are critical design requirements.
FAQ
What is the maximum input voltage the MAX17245ETESA+T can withstand during transient events?
The MAX17245ETESA+T supports 42V input transient protection for events lasting less than 1 second. This rating applies across the full -40°C to +85°C operating temperature range and enables reliable operation in automotive load-dump scenarios and industrial 24V bus surges without external TVS diodes. The device remains functional during these transients and resumes normal regulation once voltage returns within the 3.5V–36V continuous operating range.
Can the MAX17245ETESA+T generate a 3.3V output with ±2% accuracy without external resistors?
Yes, the MAX17245ETESA+T provides factory-trimmed fixed 3.3V and 5V output options with ±2% accuracy over temperature and line/load conditions. To use the fixed 3.3V output, connect the FB pin directly to AGND - no external resistor divider is required. This simplifies design for standard logic rails and eliminates resistor tolerance and thermal drift errors.
How does the FSYNC pin affect the MAX17245ETESA+T's light-load efficiency and EMI performance?
The FSYNC pin selects between two distinct operating modes: connecting FSYNC to AGND enables PFM mode, reducing quiescent current to 28µA and improving light-load efficiency; connecting FSYNC to BIAS or an external clock forces fixed-frequency PWM mode, eliminating frequency variation to minimize EMI peaks - especially valuable in RF-sensitive applications like cellular modems. The MAX17245ETESA+T automatically transitions between modes based on this single logic-level input.
What thermal considerations apply to the MAX17245ETESA+T in a 5mm × 5mm TQFN package?
The MAX17245ETESA+T in TQFN-16 has a junction-to-ambient thermal resistance (θJA) of 35°C/W on a standard 4-layer PCB per JEDEC 51-7. To maintain safe operation at 3.5A, the exposed pad (EP) must be soldered to a large contiguous copper area tied to PGND. Derating begins above +70°C ambient (28.6mW/°C), and thermal shutdown activates at +175°C junction temperature with 15°C hysteresis - ensuring robust protection under overload or poor heatsinking.
Does the MAX17245ETESA+T require an external Schottky diode despite having integrated MOSFETs?
Yes, the MAX17245ETESA+T datasheet explicitly states that an external Schottky diode is required between LX and PGND to support the full 3.5A load range, even though it integrates high-side and low-side MOSFETs. This diode assists during light-load PFM operation and improves efficiency under certain conditions. The internal low-side MOSFET enables forced-PWM mode but does not replace the need for the external diode in all operating regions.
MAX17245ETESA+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:
- Active
- 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)
MAX17245ETESA+T FAQ
1.How can I place an order for MAX17245ETESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17245ETESA+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 MAX17245ETESA+T reliable?
The price and inventory of MAX17245ETESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17245ETESA+T is usually 5 days.
3.What payment methods are accepted for MAX17245ETESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17245ETESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17245ETESA+T?
MAX17245ETESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17245ETESA+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 MAX17245ETESA+T?
For technical support, including MAX17245ETESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17245ETESA+T requirements.
6.How does Aetrix verify that MAX17245ETESA+T is sourced from the original manufacturer or authorized distributors?
All MAX17245ETESA+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 MAX17245ETESA+T meets industry standards.
7.What is the process for return or replacement of MAX17245ETESA+T?
All MAX17245ETESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17245ETESA+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 MAX17245ETESA+T part is unused and in its original packaging.
Return procedure for MAX17245ETESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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