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Analog Devices Inc./Maxim Integrated MAX17502EATB+T
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- Part No.:
- MAX17502EATB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX17502EATB+T.pdf
- Description:
- IC REG BUCK 3.3V 1A 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,597
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Product details
Overview
MAX17502EATB+T from Maxim Integrated is a 60V input, 1A synchronous step-down DC-DC converter with integrated high-side pMOS and low-side nMOS FETs, fixed 3.3V output, ±1.7% regulation accuracy over –40°C to +125°C, and 600kHz switching frequency - used in industrial power rails for PLC I/O modules and sensor signal conditioning.
For engineers reviewing the MAX17502EATB+T datasheet, MAX17502EATB+T pinout, MAX17502EATB+T application, or MAX17502EATB+T equivalent, key selection criteria include its 4.5V–60V wide input range, internal compensation for fixed-output variants, hiccup-mode overcurrent protection, open-drain RESET with 92.5%/95.5% VOUT thresholds, and TDFN-10 (3mm × 2mm) ultra-compact package.
Technical Context
The MAX17502EATB+T implements peak-current-mode control with fixed-frequency PWM, using an internal transconductance error amplifier (GM = 590µS typ) and slope compensation to stabilize the loop. Its high-side pMOS (RDS-ONH = 0.85Ω typ at +25°C) and low-side nMOS (RDS-ONL = 0.35Ω typ) enable >90% peak efficiency without external Schottky diodes.
It integrates a 5V LDO (VCC) with 40mA sink capability, resistor-programmable EN/UVLO (1.218V rising threshold), adjustable soft-start via SS pin, and open-drain RESET with 1024-cycle delay after regulation - all operating across –40°C to +125°C ambient temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports direct connection to 24V/48V industrial buses and battery stacks without pre-regulation. |
| Output Voltage | Fixed 3.3V ±1.7% - tightly regulated for MCU core logic, ADC references, and digital isolator supplies. |
| Max Output Current | 1A continuous - sufficient for powering microcontrollers, RS-485 transceivers, and analog front-ends in compact nodes. |
| Switching Frequency | 600kHz (typ) - enables use of small 2.2µH inductors and reduces EMI filter size vs. lower-frequency alternatives. |
| Efficiency (Peak) | >90% at 1A - minimizes thermal load in sealed enclosures and extends battery life in portable equipment. |
| Shutdown Current | 0.9µA (typ) - enables ultra-low-power wake-on-event designs in always-on monitoring systems. |
| Operating Temperature | –40°C to +125°C ambient - qualified for deployment in HVAC controllers, motor drives, and outdoor telecom gear. |
Pinout & Package
MAX17502EATB+T is housed in a 10-pin, 3mm × 2mm TDFN package with exposed pad (EP) connected to GND for thermal management. Pin 1 is PGND; pins 2–10 follow standard TDFN numbering with no internal connections on pin 7 (N.C./COMP) for fixed-output versions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PGND | Power Ground | Low-impedance return path for high-current LX switching node; must be tied to large copper pour under EP. |
| 2 VIN | Main Input Supply | Accepts 4.5V–60V; requires ≥2.2µF ceramic input capacitor close to pin for ripple suppression. |
| 3 EN/UVLO | Enable / Input UVLO Control | Resistor-divider programmable turn-on threshold (1.218V rising); pull high to VIN for always-on operation. |
| 4 VCC | Internal 5V LDO Output | Bypass with 1µF ceramic to GND; powers internal logic and low-side gate driver; shuts down if VCC drops below 3.7V. |
| 5 FB/VO | Feedback Input | Directly connected to 3.3V output; internal resistive divider sets regulation point - no external components needed. |
| 6 SS | Soft-Start Timing | Capacitor-to-GND sets inrush current ramp time; typical CSS = 3300pF yields ~18ms soft-start for 3.3V/22µF output. |
| 7 N.C./COMP | No Connect (Fixed Output) | Not internally connected for MAX17502E; leave floating - unused for compensation in this variant. |
| 8 RESET | Open-Drain Power-Good | Pulled low when VOUT < 92.5% of 3.3V; goes high 1024 cycles after VOUT > 95.5%; requires external pull-up. |
| 9 GND | Analog Ground | Reference for FB, SS, COMP; tie to PGND at single-point star ground near VCC bypass cap. |
| 10 LX | Switching Node | Connects to inductor switch node; carries high di/dt; requires short, low-inductance trace to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFET Integration | Eliminates external Schottky diode - reduces BOM count, PCB area, and conduction losses by ~30% vs. asynchronous buck. |
| Internal Compensation (Fixed Output) | Zero external compensation components required for 3.3V/5V versions - simplifies layout and improves production yield. |
| Hiccup-Mode Overcurrent Protection | Auto-retries after 32,768 clock cycles upon short-circuit - limits average power dissipation to <100mW during fault, preventing thermal runaway. |
| All-Ceramic Capacitor Support | Enables full use of X7R/X5R MLCCs on input/output - eliminates electrolytic aging concerns and improves reliability in high-temp environments. |
| Prebiased Power-Up | Prevents reverse current flow into precharged output - avoids damaging downstream circuitry during hot-swap or brownout recovery. |
Applications
| Industrial Process Control | HVAC and Building Control |
|---|---|
Use Scenario: Powering isolated analog input modules in distributed control systems with 24V DC field bus. IC Role / Device Role / Timing Role: Primary 3.3V point-of-load regulator delivering stable supply to precision ADCs, isolation amplifiers, and ARM Cortex-M4 MCUs. Use Value: ±1.7% output accuracy and –40°C to +125°C operation ensure measurement integrity across factory floor temperature swings. | Use Scenario: Supplying 3.3V to wireless sensor nodes embedded in ductwork and thermostats. IC Role / Device Role / Timing Role: Efficient local DC-DC conversion from 24V HVAC control bus, enabling long-life battery backup operation. Use Value: 0.9µA shutdown current extends 3.6V LiSOCl₂ battery life to >10 years in maintenance-free deployments. |
| Base Station Power Management | Home Theatre Equipment |
Use Scenario: Generating 3.3V for remote radio unit (RRU) digital control logic in 4G/5G macro base stations. IC Role / Device Role / Timing Role: Secondary regulator fed from intermediate 12V rail; provides clean, low-noise supply for FPGA configuration and timing ICs. Use Value: 600kHz switching and integrated MOSFETs reduce conducted EMI, easing compliance with EN 55022 Class B limits. | Use Scenario: Powering HDMI interface ICs and audio DSPs in AV receivers with variable AC adapter inputs. IC Role / Device Role / Timing Role: Wide-input buck converter accepting 9–36V DC adapters, delivering regulated 3.3V for digital subsystems. Use Value: 4.5V–60V input range accommodates universal AC/DC adapters while maintaining tight regulation during line transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDDARQ1 | 4.5V–65V input, 1A, 600kHz, AEC-Q100 Grade 1; requires external compensation and bootstrap diode. | Automotive-qualified; lacks integrated VCC LDO and open-drain RESET; needs additional components for same functionality. | Select LM5164QDDARQ1 only for automotive-grade designs requiring ASIL-B compliance and higher VIN max rating. |
| TPS54260DGQR | 3.5V–60V input, 2.5A, 100–2500kHz adjustable freq; external MOSFETs; no integrated VCC LDO or RESET. | Higher current capability but larger solution size; no internal soft-start or hiccup protection - requires external circuitry. | Choose TPS54260DGQR when >1A load or programmable frequency is mandatory, and board space is not constrained. |
Compared with LM5164QDDARQ1 and TPS54260DGQR, the MAX17502EATB+T delivers a complete, component-minimized 3.3V solution in the smallest footprint (3mm × 2mm), with built-in RESET, soft-start, and thermal protection - ideal for space-constrained industrial edge nodes where design simplicity and qualification speed matter most.
Availability
MAX17502EATB+T is available at Aetrix Electronics and suitable for industrial process control, HVAC systems, and base station power management requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX17502EATB+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 high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX17502 product line delivers ultra-compact, high-voltage synchronous buck regulators targeting space- and reliability-critical industrial power applications - emphasizing wide input range, integrated protection, and minimal external component count.
FAQ
What is the recommended input capacitor for MAX17502EATB+T?
The MAX17502EATB+T requires a minimum 2.2µF X7R ceramic capacitor placed as close as possible to the VIN and PGND pins. For improved ripple suppression in noisy 24V/48V industrial environments, a parallel 10µF–22µF X7R capacitor is recommended. An electrolytic capacitor (e.g., 100µF) may be added in parallel if the input source is located >10cm away to dampen potential LC oscillations.
Does MAX17502EATB+T support prebiased start-up?
Yes, MAX17502EATB+T supports prebiased output start-up: both high-side and low-side switches remain off until the first PWM pulse is commanded, preventing reverse current flow into a precharged 3.3V rail. This behavior is inherent to the control architecture and requires no external configuration - critical for hot-swap and redundant power system designs.
What is the function of the N.C./COMP pin on MAX17502EATB+T?
The N.C./COMP pin (Pin 7) on MAX17502EATB+T is a no-connect terminal - it is not internally bonded and must be left unconnected. This pin is reserved for external loop compensation in adjustable-output variants (MAX17502G/H); for the fixed 3.3V MAX17502E, internal compensation is fully integrated and no external network is needed.
How does the RESET output behave during thermal shutdown?
During thermal shutdown, the RESET output of MAX17502EATB+T is actively driven low - identical to its behavior during output undervoltage. This provides a unified fault indicator for both thermal and regulation failures. RESET remains low until junction temperature falls below 155°C (165°C – 10°C hysteresis) and the output re-regulates above 95.5% of 3.3V, after which it releases high-impedance state following the standard 1024-cycle delay.
Can MAX17502EATB+T operate with 100% duty cycle?
No, MAX17502EATB+T cannot operate at 100% duty cycle. Its maximum duty cycle is limited to 92% (typ) to ensure reliable minimum off-time for low-side MOSFET gate drive and current sensing. At VIN = 4.5V and VOUT = 3.3V, the theoretical max duty is ~73%, well within the device's 92% limit - ensuring robust operation even at minimum input voltage.
MAX17502EATB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Himalaya
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x2)
MAX17502EATB+T FAQ
1.How can I place an order for MAX17502EATB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17502EATB+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 MAX17502EATB+T reliable?
The price and inventory of MAX17502EATB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17502EATB+T is usually 5 days.
3.What payment methods are accepted for MAX17502EATB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17502EATB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17502EATB+T?
MAX17502EATB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17502EATB+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 MAX17502EATB+T?
For technical support, including MAX17502EATB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17502EATB+T requirements.
6.How does Aetrix verify that MAX17502EATB+T is sourced from the original manufacturer or authorized distributors?
All MAX17502EATB+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 MAX17502EATB+T meets industry standards.
7.What is the process for return or replacement of MAX17502EATB+T?
All MAX17502EATB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17502EATB+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 MAX17502EATB+T part is unused and in its original packaging.
Return procedure for MAX17502EATB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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