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Analog Devices Inc./Maxim Integrated MAX17245ETERB+
- Part No.:
- MAX17245ETERB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX17245ETERB+.pdf
- Description:
- IC REG BCK PROG/1V 3.5A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,600
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Product details
Overview
MAX17245ETERB+ 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 or adjustable 1V–10V via resistor divider, features 28µA quiescent current in standby, 98% max duty cycle for dropout operation, and 42V transient protection-ideal for automotive front-end and industrial point-of-load regulation.
For engineers reviewing the MAX17245ETERB+ datasheet, MAX17245ETERB+ pinout, MAX17245ETERB+ application, or MAX17245ETERB+ equivalent, key selection considerations include its programmable 220kHz–2.2MHz switching frequency, PFM/PWM mode selection via FSYNC, power-good monitoring, 180° out-of-phase SYNCOUT for cascaded supplies, and thermal/overvoltage protections critical for reliable embedded power design.
Technical Context
The MAX17245ETERB+ uses current-mode control with selectable PWM (fixed-frequency) or PFM (pulse-skipping) operation-PFM disables negative inductor current and skips pulses at light loads to achieve >90% peak efficiency and ultra-low 28µA quiescent current. Its internal 5V BIAS LDO powers control circuitry and enables operation down to 3.5V input.
It integrates dual MOSFETs (100mΩ high-side, 1.5Ω low-side), supports external synchronization via FSYNC (1.8–2.6MHz), provides 180° phase-shifted SYNCOUT for multi-rail coordination, and includes automatic LX slew-rate adjustment (4ns/8ns) optimized for EMI reduction across its full frequency range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V continuous; withstands 42V transients ≤1s-enables robust operation in automotive cold-crank and industrial 24V bus environments. |
| Output Current | Up to 3.5A continuous; peak LX current limit 4.2A–6.2A-supports demanding point-of-load applications without external current sensing. |
| Output Voltage Options | Fixed 3.3V (±2%) or 5V (±2%), or adjustable 1V–10V via FB resistor divider-provides flexibility for mixed-voltage SoC or FPGA power domains. |
| Quiescent Current | 28µA typical at no load (VOUT = 5V); 5µA in shutdown-enables always-on subsystems with minimal battery drain. |
| Switching Frequency | 220kHz–2.2MHz, resistor-programmable (RFOSC) or externally synchronized-allows optimization of size (high-freq) vs. efficiency (low-freq) and EMI compliance. |
| Efficiency | >90% peak efficiency; maintains >85% at 10mA load in PFM mode-reduces thermal stress and eliminates need for heatsinking in compact layouts. |
| Protection Features | Cycle-by-cycle current limit, thermal shutdown (175°C, 15°C hysteresis), overvoltage protection (105% VOUT), and soft-start (8ms)-ensures autonomous fault recovery in unattended systems. |
Pinout & Package
MAX17245ETERB+ is housed in a 16-pin 5mm × 5mm TQFN package with exposed pad (EP), optimized for thermal dissipation (θJA = 35°C/W on multilayer board). The EP must be soldered to a large-area PGND copper plane but 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 precise interleaving of multiple MAX17245ETERB+ devices for higher-power cascaded supplies. |
| 2 – FSYNC | Mode select & sync input | Logic-level input: AGND = PFM mode; BIAS or external clock = forced-PWM; enables EMI control and multi-device synchronization. |
| 3 – FOSC | Frequency programming node | Connects to AGND via resistor (e.g., 12kΩ → 2.2MHz); sets switching frequency without external oscillator components. |
| 4 – OUT | Power output & internal supply | Delivers regulated output; also powers internal circuitry when VOUT = 3–5V, eliminating 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 | Requires RC compensation network to AGND; stabilizes loop response across input/output/load variations. |
| 7 – BIAS | Integrated 5V LDO output | Supplies internal logic and gate drivers; bypassed with 1µF ceramic capacitor-reduces external component count. |
| 8 – AGND | Analog ground reference | Separate ground for precision feedback and error amplifier; must be star-connected to PGND near IC to minimize noise coupling. |
| 9 – EN | High-voltage enable input | 3.5V–42V compatible; drives low to disable (5µA shutdown); supports direct connection to automotive KL30 or CAN transceiver INH pins. |
| 10 – SUP | Main logic supply input | Powers internal LDO; bypassed with 4.7µF ceramic capacitor-ensures stable startup and low-noise bias under dynamic load. |
| 11 – SUPSW | Switch driver supply input | Directly powers high-side MOSFET gate driver; requires 0.1µF + 4.7µF ceramic decoupling-critical for efficient switching at high VIN. |
| 12 – LX | Switching node | Connects to inductor and Schottky diode cathode; high dv/dt node requiring careful layout and optional snubber (1Ω/220pF) above 1.8MHz. |
| 13–14 – PGND | Power ground | Low-impedance return path for high-current switch node; must be solidly connected to EP and separated from AGND except at single point. |
| 15 – PGOOD | Open-drain power-good output | Active-low signal asserts when VOUT ≥95% regulation; deasserts at ≤92%; used for system power sequencing and fault detection. |
| 16 – EP | Exposed thermal pad | Internally connected to PGND; requires solder mask-defined thermal relief and ≥4 thermal vias to inner ground planes for effective heat transfer. |
Key Features
| Feature | Design Value |
|---|---|
| All-ceramic capacitor support | Enables ultra-compact PCB layout with no electrolytic or tantalum capacitors required-improves reliability and lifetime in harsh environments. |
| Automatic LX slew-rate control | Adjusts HSFET turn-on time (4ns at >1.1MHz, 8ns at <1.1MHz) to minimize EMI without sacrificing efficiency-eliminates manual gate-resistor tuning. |
| Spread-spectrum modulation (factory-enabled) | ±6% frequency dither centered on fOSC reduces peak EMI emissions by spreading energy across spectrum-helps pass CISPR 25 Class 5 without added shielding. |
| 180° out-of-phase SYNCOUT | Allows two or more MAX17245ETERB+ converters to operate interleaved, halving input/output ripple current and reducing required bulk capacitance. |
| Fixed 8ms soft-start | Internally controlled ramp limits inrush current during power-up-prevents input voltage sag and eliminates need for external soft-start circuitry. |
Applications
| Automotive Front-End Regulation | Industrial Point-of-Load Supply |
|---|---|
|
Use Scenario: Powering infotainment head units and ADAS sensors from 12V/24V vehicle battery with cold-crank (down to 3.5V) and load-dump (up to 42V) transients. IC Role / Device Role / Timing Role: Primary buck regulator providing stable 5V/3.3V rails; handles wide VIN, monitors PGOOD for MCU reset assertion. Use Value: 98% duty cycle sustains output during cranking; 42V transient rating avoids external TVS; 28µA quiescent current extends parked-battery life. |
Use Scenario: Generating clean 3.3V for industrial PLC I/O modules and fieldbus transceivers operating from 24V DC supply. IC Role / Device Role / Timing Role: Local DC-DC converter with PGOOD signaling for system-level power sequencing and fault reporting. Use Value: Fixed ±2% output accuracy ensures sensor ADC reference stability; SYNCOUT enables synchronized multi-rail supplies to reduce conducted EMI. |
| RF Transceiver Power Supply | Distributed Telecom Power |
|
Use Scenario: Powering LTE/5G RF front-end modules where strict EMI compliance (CISPR 22/32) and frequency stability are mandatory. IC Role / Device Role / Timing Role: Low-noise, fixed-frequency PWM supply; spread-spectrum enabled; synchronized to baseband clock via FSYNC. Use Value: Forced-PWM mode eliminates frequency variation; ±6% dither lowers peak radiated emissions; 2.2MHz operation minimizes filter size. |
Use Scenario: Distributed 5V/3.5A power for remote radio units (RRUs) and small-cell base stations powered from -48V telecom rectifiers. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter; cascaded via SYNCOUT to parallel multiple units for higher current. Use Value: >90% efficiency reduces thermal load in sealed enclosures; 16-pin TQFN fits dense PCB layouts; thermal shutdown ensures safe derating. |
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 | 3.5V–36V input, 4A output, 2.1MHz max fSW, 15µA IQ, no integrated BIAS LDO-requires external bias rail. | Lacks integrated 5V BIAS regulator and 180° SYNCOUT; better suited for designs already using centralized bias supply. | Select LM61480RQWR when lowest quiescent current (15µA) is critical and external bias is available; avoid if BIAS simplification or cascading is needed. |
| TPS54560BQDDARQ1 | 3.5V–60V input, 5A output, 100kHz–2.5MHz fSW, 14µA IQ, no PFM mode-PWM-only operation. | Higher VIN rating and current, but no PFM light-load mode; lacks spread-spectrum and SYNCOUT functionality. | Select TPS54560BQDDARQ1 for 48V industrial systems needing >36V tolerance; avoid when PFM efficiency or EMI dither is required. |
Compared with LM61480RQWR and TPS54560BQDDARQ1, the MAX17245ETERB+ uniquely integrates a 5V BIAS LDO, 180° SYNCOUT for interleaving, and factory-enabled spread-spectrum-making it optimal for space-constrained, EMI-sensitive, multi-rail designs where self-contained bias and coordinated timing are essential.
Availability
MAX17245ETERB+ is available at Aetrix Electronics and suitable for automotive front-end regulation, industrial point-of-load conversion, and RF transceiver power supply applications requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.
Supply support for MAX17245ETERB+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX17245 product line delivers high-efficiency, wide-input synchronous buck regulators with integrated MOSFETs, designed specifically for rugged embedded power applications demanding low IQ, transient resilience, and EMI control.
FAQ
What is the maximum input voltage the MAX17245ETERB+ can withstand during transients?
The MAX17245ETERB+ supports continuous operation from 3.5V to 36V and is rated for 42V input transients lasting up to 1 second. This transient rating protects against automotive load-dump events without requiring external TVS diodes, simplifying front-end protection design while maintaining reliability under real-world conditions.
How does the MAX17245ETERB+ achieve ultra-low quiescent current in standby mode?
The MAX17245ETERB+ achieves 28µA typical quiescent current in standby by disabling non-essential circuitry-including the high-side MOSFET driver and oscillator-while maintaining regulation via the internal BIAS LDO and feedback loop. This enables always-on subsystems (e.g., CAN wake-up circuits) to operate for extended periods without draining the battery.
Can the MAX17245ETERB+ operate in dropout condition, and what is its maximum duty cycle?
Yes, the MAX17245ETERB+ operates in dropout by running at up to 98% duty cycle, allowing it to sustain regulated output even when input voltage drops close to the output level-such as during automotive cold-crank events. This capability eliminates the need for pre-regulators in wide-VIN applications where input may dip below 6V.
What is the purpose of the SYNCOUT pin on the MAX17245ETERB+, and how is it used?
The SYNCOUT pin on the MAX17245ETERB+ provides an open-drain 180° out-of-phase clock signal relative to the internal oscillator. It is used to interleave multiple MAX17245ETERB+ devices-reducing input/output ripple current, lowering required capacitance, and improving thermal distribution in high-current distributed power architectures.
Does the MAX17245ETERB+ require an external Schottky diode, and why?
Yes, the MAX17245ETERB+ requires an external Schottky diode connected between LX and PGND-even though it integrates both high-side and low-side MOSFETs. This diode supports the full 3.5A load range in PFM mode and improves light-load efficiency by preventing reverse inductor current, ensuring robust operation across all operating conditions.
MAX17245ETERB+ 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)
MAX17245ETERB+ FAQ
1.How can I place an order for MAX17245ETERB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17245ETERB+ 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+ reliable?
The price and inventory of MAX17245ETERB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17245ETERB+ is usually 5 days.
3.What payment methods are accepted for MAX17245ETERB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17245ETERB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17245ETERB+?
MAX17245ETERB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17245ETERB+ 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+?
For technical support, including MAX17245ETERB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17245ETERB+ requirements.
6.How does Aetrix verify that MAX17245ETERB+ is sourced from the original manufacturer or authorized distributors?
All MAX17245ETERB+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX17245ETERB+?
All MAX17245ETERB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17245ETERB+, 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+ part is unused and in its original packaging.
Return procedure for MAX17245ETERB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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