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Analog Devices Inc./Maxim Integrated MAX5035AUPA+
- Part No.:
- MAX5035AUPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX5035AUPA+.pdf
- Description:
- IC REG BUCK 3.3V 1A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,021
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Product details
Overview
The MAX5035AUPA+ from Maxim Integrated is a high-voltage, 1A step-down DC-DC converter with fixed 3.3V output, operating from 7.5V to 76V input and consuming only 270µA quiescent current at no load. It integrates a 0.4Ω high-side DMOS FET, internal frequency compensation, and operates at a fixed 125kHz switching frequency with pulse-skipping mode for light-load efficiency. Used in automotive power supplies where wide VIN and low IQ are critical.
For engineers reviewing the MAX5035AUPA+ datasheet, MAX5035AUPA+ pinout, MAX5035AUPA+ application, or MAX5035AUPA+ equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, and confirmed alternative options for industrial and automotive 3.3V point-of-load conversion.
Technical Context
The MAX5035AUPA+ implements voltage-mode PWM control with feed-forward compensation, enabling stable regulation across its 7.5V–76V input range. Its internal 0.4Ω high-side DMOS switch and integrated gate driver (BST/LX bootstrap architecture) eliminate external drive components while supporting up to 1A continuous output current.
It features automatic transition between fixed-frequency PWM and pulse-skipping mode below ~85mA load, reducing IQ to 270µA (typ). Protection includes undervoltage lockout (5.2V typ), cycle-by-cycle current limit (1.9A typ), hiccup-mode short-circuit response, and thermal shutdown at +160°C with +20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports direct connection to 24V/48V industrial buses and 12V/24V automotive batteries with headroom for transients. |
| Output Voltage | Fixed 3.3V ±3.5% (3.185V–3.415V) - tightly regulated for powering microcontrollers, sensors, and logic interfaces without external feedback resistors. |
| Max Output Current | 1A continuous - limited by package thermal resistance (110°C/W for PDIP); derates above +70°C ambient. |
| Quiescent Current | 270µA (typ) at no load - enables always-on systems (e.g., CAN nodes, telematics) with minimal standby power draw. |
| Switching Frequency | 125kHz (109–137kHz) - balances EMI control, inductor size, and efficiency; fixed for predictable filter design. |
| High-Side RDS(ON) | 0.4Ω (typ) - reduces conduction loss and improves full-load efficiency up to 86% at 12VIN/0.5A. |
| Shutdown Current | 10µA (typ) - allows deep sleep states in battery-backed systems without significant leakage drain. |
Pinout & Package
MAX5035AUPA+ is supplied in an 8-pin plastic DIP (PDIP) package with through-hole mounting and JEDEC-standard footprint (0.300" width). Thermal resistance θJA = 110°C/W enables operation up to +85°C ambient without forced airflow when properly heatsinked via PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor node | Connects 0.1µF ceramic cap to LX; supplies gate drive voltage for internal high-side DMOS switch during on-time. |
| VD | Internal regulator output | Provides ~7.8V bias for internal circuitry; bypass to GND with 0.1µF ceramic cap to stabilize gate drive and analog blocks. |
| SGND | Signal ground reference | Must be tied directly to system GND; separates analog reference from power return path to minimize noise coupling. |
| FB | Feedback sense input | Internally connected to 3.3V output; no external divider needed-enables plug-and-play 3.3V regulation. |
| ON/OFF | Enable/shutdown control | Logic-high (>1.69V) enables operation; logic-low (<1.53V) forces shutdown with 10µA supply current. |
| GND | Power ground return | Main return path for high-current LX switching loop; must connect to SGND at single-point star ground. |
| VIN | Main input supply | Accepts 7.5V–76V; requires local low-ESR bulk capacitor (e.g., 68µF) placed adjacent to pin to suppress ripple and EMI. |
| LX | Switch node | Drives external inductor; connects internally to source of high-side DMOS; forms switching node with Schottky diode cathode. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.4Ω high-side DMOS FET | Eliminates need for external MOSFET and driver, reducing BOM count and layout complexity in space-constrained designs. |
| Internal frequency compensation | Enables stable closed-loop operation with standard LC output filters-no external compensation network required. |
| Pulse-skipping light-load mode | Maintains >80% efficiency down to ~10mA load, extending battery life in intermittent-duty applications like remote sensors. |
| Hiccup-mode short-circuit protection | Prevents thermal runaway during sustained output faults by cycling ON/OFF until fault clears-protects both IC and external components. |
| Automotive-grade temperature range | Validated for 0°C to +85°C operation-meets requirements for under-hood and cabin electronics without derating. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interface circuits in door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary 3.3V point-of-load regulator converting raw 12V battery rail with transient tolerance up to 76V. Use Value: 270µA quiescent current prevents battery drain during vehicle sleep mode; UVLO ensures clean startup after cold cranking. | Use Scenario: Providing isolated 3.3V supply for digital I/O logic in programmable logic controller backplanes. IC Role / Device Role / Timing Role: High-reliability buck converter delivering regulated 3.3V from 24V industrial bus with surge immunity. Use Value: 76V max input withstands 48V bus transients per IEC 61000-4-5; thermal shutdown protects against enclosure overheating. |
| Telecom Remote Radio Unit | Medical Portable Diagnostic Device |
Use Scenario: Generating 3.3V for FPGA configuration and RF front-end bias in outdoor small-cell base stations. IC Role / Device Role / Timing Role: Primary DC-DC stage stepping down -48V telecom supply (via polarity inversion) to 3.3V logic rail. Use Value: Fixed 3.3V output eliminates calibration drift; 125kHz switching allows compact 100µH inductor and avoids AM band interference. | Use Scenario: Supplying 3.3V to low-power MCU and analog front-end in handheld ultrasound or glucose meters. IC Role / Device Role / Timing Role: Efficient, low-noise power source for battery-operated medical devices requiring long runtime and low EMI. Use Value: 10µA shutdown current preserves battery charge during standby; pulse-skipping maintains >85% efficiency at µA-level sensor bias loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5008AMM/NOPB | 4.5V–75V input, 3.3V fixed, 0.5A output, 1MHz switching, no integrated compensation. | Lower output current and higher fSW require external compensation and smaller inductors; less suitable for 1A continuous loads. | Select LM5008AMM/NOPB only if board space is constrained and 0.5A suffices; verify stability with Type II compensation network. |
| TPS54340DDAR | 3.5V–42V input, adjustable output, 3.5A output, 100kHz–2.5MHz programmable fSW, external MOSFETs. | Wider regulation flexibility but requires external high-voltage FETs and compensation; not pin-compatible or drop-in. | Choose TPS54340DDAR when >1A output or adjustable VOUT is required; redesign PCB layout and feedback network. |
Compared with LM5008AMM/NOPB and TPS54340DDAR, the MAX5035AUPA+ offers higher output current (1A vs. 0.5A/3.5A), integrated 0.4Ω FET and compensation, and wider 7.5V–76V input range-making it optimal for fixed 3.3V, high-input-voltage, low-IQ industrial and automotive applications without layout redesign.
Availability
MAX5035AUPA+ is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power rails, and telecom remote radio units requiring stable component supply with extended temperature validation and RoHS compliance.
Supply support for MAX5035AUPA+ 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 MAX5035 product line delivers high-efficiency, high-voltage buck converters targeting 12V/24V/48V system rails in automotive and industrial environments where input transients, low quiescent current, and integrated protection are essential.
FAQ
What is the maximum input voltage rating for the MAX5035AUPA+?
The MAX5035AUPA+ has an absolute maximum input voltage rating of +80V, with guaranteed operation up to +76V. This allows safe use in 24V and 48V industrial systems and automotive applications subject to load-dump transients. Operation beyond 76V risks permanent damage and is outside the specified functional range.
Does the MAX5035AUPA+ require external feedback resistors to set the output voltage?
No, the MAX5035AUPA+ does not require external feedback resistors. As a fixed 3.3V version (MAX5035A), its FB pin is internally connected to the regulated 3.3V output. External resistors are only needed for adjustable versions (MAX5035D/E), making MAX5035AUPA+ a true plug-and-play solution for 3.3V point-of-load conversion.
What package type and lead finish does the MAX5035AUPA+ use?
The MAX5035AUPA+ uses an 8-pin plastic DIP (PDIP) package with through-hole mounting and a lead(Pb)-free/RoHS-compliant finish denoted by the "+" suffix. It meets JEDEC standards and provides θJA = 110°C/W for thermal management in ambient temperatures up to +85°C.
How does the MAX5035AUPA+ achieve low quiescent current in light-load conditions?
The MAX5035AUPA+ achieves 270µA typical quiescent current by automatically entering pulse-skipping mode below ~85mA load. In this mode, it skips switching cycles while maintaining regulation, significantly reducing switching losses and gate drive current-ideal for battery-powered or always-on automotive modules.
Can the MAX5035AUPA+ be used in automotive applications requiring extended temperature range?
The MAX5035AUPA+ is rated for 0°C to +85°C operation. For full automotive (-40°C to +125°C) qualification, select the MAX5035AASA/V+ variant. While MAX5035AUPA+ functions reliably in cabin or non-under-hood automotive locations, it is not qualified for under-hood deployment per AEC-Q100.
MAX5035AUPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7.5V
- Voltage - Input (Max):
- 76V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 125kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX5035AUPA+ FAQ
1.How can I place an order for MAX5035AUPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035AUPA+ 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 MAX5035AUPA+ reliable?
The price and inventory of MAX5035AUPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035AUPA+ is usually 5 days.
3.What payment methods are accepted for MAX5035AUPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035AUPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035AUPA+?
MAX5035AUPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035AUPA+ 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 MAX5035AUPA+?
For technical support, including MAX5035AUPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035AUPA+ requirements.
6.How does Aetrix verify that MAX5035AUPA+ is sourced from the original manufacturer or authorized distributors?
All MAX5035AUPA+ 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 MAX5035AUPA+ meets industry standards.
7.What is the process for return or replacement of MAX5035AUPA+?
All MAX5035AUPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035AUPA+, 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 MAX5035AUPA+ part is unused and in its original packaging.
Return procedure for MAX5035AUPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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