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Analog Devices Inc./Maxim Integrated MAX17245ETESA+
- Part No.:
- MAX17245ETESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX17245ETESA+.pdf
- Description:
- IC REG BCK PROG/1V 3.5A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,010
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Product details
Overview
MAX17245ETESA+ 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 front-end power supplies and industrial point-of-load regulation.
For engineers reviewing the MAX17245ETESA+ datasheet, MAX17245ETESA+ pinout, MAX17245ETESA+ application, or MAX17245ETESA+ 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 for RF-sensitive designs.
Technical Context
The MAX17245ETESA+ employs current-mode control with selectable PWM or PFM operation: PWM maintains constant 220kHz–2.2MHz frequency across all loads, while PFM disables negative inductor current and skips pulses at light loads to achieve >90% peak efficiency and 28µA quiescent current. 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 a 180° out-of-phase SYNCOUT for cascaded multi-rail systems. The FSYNC pin selects operating mode - AGND for PFM, BIAS or external clock for forced-PWM - and supports synchronization within one cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V continuous; withstands 42V transients ≤1s - enables cold-crank and industrial 24V bus compatibility. |
| Output Current | Up to 3.5A DC continuous - supports mid-power PoL rails for microcontrollers, sensors, and RF modules. |
| Output Voltage Options | Fixed 3.3V (±2%) or 5V (±2%), or adjustable 1V–10V via FB resistor divider - accommodates diverse logic and analog supply requirements. |
| Quiescent Current | 28µA typical in PFM no-load mode - extends battery life in always-on automotive and IoT applications. |
| Switching Frequency | 220kHz–2.2MHz, resistor-programmable (RFOSC) or externally synchronized - balances size (inductor/capacitor) vs. EMI/efficiency trade-offs. |
| Efficiency | >90% peak efficiency - achieved via synchronous rectification, automatic LX slew-rate adjustment, and PFM optimization at light loads. |
| Duty Cycle Limit | 98% maximum - sustains regulation during deep undervoltage conditions (e.g., automotive cranking). |
Pinout & Package
The MAX17245ETESA+ is housed in a 16-pin TQFN package (5mm × 5mm, 0.5mm pitch) with exposed pad (EP) connected to PGND for thermal management. Pin functions are identical between TQFN and TSSOP variants per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – SYNCOUT | Open-drain clock output | Provides 180° out-of-phase signal relative to internal oscillator; enables phase interleaving in multi-converter systems. |
| 2 – FSYNC | Mode select & sync input | Logic-level input: AGND = PFM mode; BIAS/external clock = forced-PWM; enables EMI control and multi-device synchronization. |
| 3 – FOSC | Frequency setting input | Resistor-to-AGND sets switching frequency (220kHz–2.2MHz); allows precise EMI tuning and layout optimization. |
| 4 – OUT | Power output node | Delivers regulated DC output; also powers internal circuitry when VOUT ≥3V during standby - simplifies biasing. |
| 5 – FB | Feedback input | Senses output voltage via resistive divider; 1.0V reference enables accurate 1V–10V programming or direct connection to BIAS for 5V. |
| 6 – COMP | Error amplifier output | Drives external RC compensation network to stabilize loop response across line/load/temperature variations. |
| 7 – BIAS | Internal LDO output | 5V ±0.3V regulated supply for internal logic; bypassed with 1µF ceramic capacitor - eliminates need for external bias rail. |
| 8 – AGND | Analog ground reference | Separate ground for precision feedback and error amplifier; must be star-connected to PGND near EP to minimize noise coupling. |
| 9 – EN | Enable input | High-voltage compatible (up to 42V); active-high enable with 2.4V threshold - interfaces directly with automotive KL30 or CAN transceiver INH pins. |
| 10 – SUP | Main supply input | Powers internal LDO; requires 4.7µF ceramic bypass - decouples logic supply from noisy input sources. |
| 11 – SUPSW | Switch supply input | Powers gate drivers; bypassed with 0.1µF + 4.7µF ceramics - ensures robust high-side MOSFET turn-on under dynamic load. |
| 12 – LX | Switching node | Connects to inductor and Schottky diode cathode; fast 4ns/8ns slew-rate control minimizes EMI without sacrificing efficiency. |
| 13–14 – PGND | Power ground | Low-impedance return path for high-current switch node; must be solidly tied to EP and separated from AGND at single point. |
| 15 – PGOOD | Open-drain power-good | Active-low flag asserting at 95% VFB, deasserting at 92% VFB - enables reliable power sequencing in multi-rail systems. |
| 16 – BST | Bootstrap supply | Requires 0.1µF capacitor between BST and LX - sustains high-side gate drive during 98% duty cycle operation. |
| EP – Exposed Pad | Thermal & power ground | Must connect to large copper pour on PCB layer; primary thermal path (θJA = 35°C/W for TQFN) - critical for 3.5A operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side MOSFETs | Eliminates external switches and reduces BOM count; RDS(on) of 220mΩ (HS) and 3Ω (LS) enables >90% efficiency at 3.5A. |
| All-ceramic capacitor support | Enables ultra-compact 5mm × 5mm solution size with no electrolytics - improves reliability and temperature stability. |
| Spread-spectrum modulation (factory-enabled) | Reduces peak EMI by ±6% frequency dithering - meets stringent CISPR 25 Class 5 requirements for automotive RF environments. |
| Automatic LX slew-rate adjustment | Optimizes rise time (4ns @ >1.1MHz, 8ns @ <1.1MHz) to balance EMI suppression and switching loss - no manual tuning required. |
| 180° out-of-phase SYNCOUT | Enables phase-interleaved multi-converter designs that cut input/output ripple current by up to 50% - reduces filter component stress. |
| 42V input transient protection | Withstands load-dump events per ISO 7637-2 without external clamping - simplifies front-end protection for 12V/24V automotive systems. |
Applications
| Automotive Front-End Power Supply | Industrial Point-of-Load Regulation |
|---|---|
|
Use Scenario: Powering infotainment SoCs and ADAS camera modules from 12V battery with cold-crank (down to 3.5V) and load-dump (up to 42V) resilience. IC Role / Device Role / Timing Role: Primary buck regulator providing stable 5V/3.3V rails; operates in forced-PWM mode during RF transmission to suppress switching noise. Use Value: 98% duty cycle maintains regulation during cranking; 28µA quiescent current prevents battery drain in parked state. |
Use Scenario: Generating isolated 3.3V supply for PLC I/O modules powered from unregulated 24V industrial bus. IC Role / Device Role / Timing Role: Synchronous step-down converter with PFM mode for standby efficiency and PWM for full-load stability. Use Value: All-ceramic design withstands wide temperature swings (-40°C to +85°C); 42V transient rating avoids external TVS diodes. |
| RF Transceiver Power Management | Distributed Telecom Supply |
|
Use Scenario: Supplying 3.3V to LTE/5G baseband processors where strict EMI limits apply near sensitive receivers. IC Role / Device Role / Timing Role: Fixed-frequency PWM converter synchronized to system clock via FSYNC; spread-spectrum enabled. Use Value: Constant 2.2MHz operation eliminates frequency hopping; ±6% dithering lowers peak radiated emissions by 10dB. |
Use Scenario: Cascading multiple MAX17245ETESA+ units on a telecom shelf to generate parallel 5V rails with reduced input ripple. IC Role / Device Role / Timing Role: Master-slave configuration using SYNCOUT/FSYNC pins to achieve 180° phase shift between converters. Use Value: Phase interleaving cuts input capacitor RMS current by 30%, enabling smaller, lower-cost bulk capacitance. |
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 | 3.5V–36V input, 4A output, 15µA IQ, but no integrated BIAS LDO - requires external 5V bias rail. | Lacks 180° SYNCOUT and spread-spectrum; better suited for cost-sensitive non-automotive designs. | Choose LM61480RQR if lower quiescent current is critical and external bias is acceptable; avoid if BIAS integration or EMI compliance is required. |
| TPS54560BQDDAQ1 | 3.5V–60V input, 5A output, 14µA IQ, AEC-Q100 qualified, but only fixed 5V/3.3V options - no 1V–10V adjustability. | No FSYNC pin for PFM/PWM selection; lacks SYNCOUT for phase interleaving. | Choose TPS54560BQDDAQ1 for higher input voltage margin (60V) and automotive qualification; avoid if adjustable output or multi-phase sync is needed. |
Compared with LM61480RQR and TPS54560BQDDAQ1, the MAX17245ETESA+ uniquely combines integrated BIAS LDO, resistor-programmable 1V–10V output, 180° SYNCOUT, and factory-enabled spread-spectrum - making it optimal for compact, EMI-critical automotive and industrial PoL designs requiring design flexibility.
Availability
MAX17245ETESA+ is available at Aetrix Electronics and suitable for automotive front-end power supplies, industrial point-of-load regulation, and RF transceiver power management requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.
Supply support for MAX17245ETESA+ 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 specifically for wide-input automotive and industrial power supplies where input transients, low quiescent current, and EMI control are critical design constraints.
FAQ
What is the maximum continuous output current supported by the MAX17245ETESA+?
The MAX17245ETESA+ delivers up to 3.5A of continuous DC output current under thermal limits defined for its TQFN package (θJA = 35°C/W). This rating assumes proper PCB layout with the exposed pad thermally connected to a large copper area and ambient temperature ≤+70°C. Derating applies above +70°C per the datasheet's 28.6mW/°C specification.
Does the MAX17245ETESA+ require an external Schottky diode despite having integrated MOSFETs?
Yes, the MAX17245ETESA+ requires an external Schottky diode connected between LX and PGND. Although it integrates high-side and low-side MOSFETs, the datasheet explicitly states this diode is necessary to support the full 3.5A load range - particularly in PFM mode and during light-load transitions where the internal low-side MOSFET alone cannot fully replace diode conduction behavior.
How does the FSYNC pin affect the operating mode of the MAX17245ETESA+?
The FSYNC pin selects between two distinct modes: connecting FSYNC to AGND enables PFM mode for lowest quiescent current (28µA), while connecting it to BIAS or an external clock forces fixed-frequency PWM operation. This selection directly controls whether switching frequency varies with load (PFM) or remains constant (PWM), enabling EMI optimization in RF-sensitive applications.
Can the MAX17245ETESA+ operate with input voltages below 3.5V?
No, the MAX17245ETESA+ has a specified minimum input voltage of 3.5V per its Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this threshold is not guaranteed and may result in failure to start, unstable regulation, or violation of internal bias requirements - especially since the integrated BIAS LDO requires sufficient headroom to generate its 5V output.
What is the purpose of the SYNCOUT pin on the MAX17245ETESA+ and how is it used?
The SYNCOUT pin on the MAX17245ETESA+ provides an open-drain 180° out-of-phase clock signal relative to the internal oscillator. It is used to synchronize multiple MAX17245ETESA+ devices in phase-interleaved configurations - reducing input and output ripple current, easing filter design, and improving thermal distribution across parallel power stages in high-current applications.
MAX17245ETESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX17245ETESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17245ETESA+ 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+ reliable?
The price and inventory of MAX17245ETESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17245ETESA+ is usually 5 days.
3.What payment methods are accepted for MAX17245ETESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17245ETESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17245ETESA+?
MAX17245ETESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17245ETESA+ 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+?
For technical support, including MAX17245ETESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17245ETESA+ requirements.
6.How does Aetrix verify that MAX17245ETESA+ is sourced from the original manufacturer or authorized distributors?
All MAX17245ETESA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX17245ETESA+?
All MAX17245ETESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17245ETESA+, 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+ part is unused and in its original packaging.
Return procedure for MAX17245ETESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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