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Analog Devices Inc./Maxim Integrated MAX5035AUSA+T
- Part No.:
- MAX5035AUSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5035AUSA+T.pdf
- Description:
- IC REG BUCK 3.3V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,458
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Product details
Overview
MAX5035AUSA+T 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 delivering up to 94% efficiency at 24VIN/0.5A. It integrates a 0.4Ω high-side DMOS FET, internal frequency compensation, and operates at 125kHz PWM with pulse-skipping mode for light-load efficiency. Used in automotive power supplies where wide VIN and low quiescent current (270µA) are critical.
For engineers reviewing the MAX5035AUSA+T datasheet, MAX5035AUSA+T pinout, MAX5035AUSA+T application, or MAX5035AUSA+T equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade thermal behavior (−40°C to +125°C), real-world efficiency curves, and two rigorously cross-checked alternative parts with documented functional differences.
Technical Context
The MAX5035AUSA+T implements voltage-mode control with feed-forward compensation and an integrated high-side N-channel DMOS switch. Its fixed 125kHz oscillator (109–137kHz over temp) enables predictable EMI filtering, while automatic transition to pulse-skipping mode below ~85mA load maintains 270µA no-load IQ and >86% efficiency at 12VIN/0.5A.
It features undervoltage lockout (5.2V typ), hiccup-mode short-circuit protection, thermal shutdown at +160°C (20°C hysteresis), and internal 7.8V regulator (VD) for gate drive. The BST pin requires a 0.1µF ceramic capacitor to LX to sustain high-side FET enhancement, and FB is internally tied to VOUT for fixed 3.3V operation (±3.5% tolerance over line/load/temp).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports 12V/24V/48V industrial and automotive battery systems with headroom for load dump transients. |
| Output Voltage | 3.3V ±3.5% (3.185V–3.415V) - tightly regulated for powering microcontrollers, sensors, and interface ICs without external feedback resistors. |
| Max Output Current | 1A continuous - limited by package thermal resistance (170°C/W for SO-8) and internal 1.9A peak switch current limit. |
| Quiescent Current | 270µA at no load - enables always-on subsystems in automotive body control modules with minimal battery drain. |
| Switching Frequency | 125kHz (109–137kHz) - balances EMI performance, inductor size, and efficiency across full input range. |
| Shutdown Current | 10µA typical - ensures ultra-low standby power when ON/OFF pin is pulled low. |
| Thermal Shutdown | +160°C junction with +140°C restart hysteresis - protects against sustained overload or poor heatsinking in enclosed environments. |
Pinout & Package
MAX5035AUSA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free (+T suffix), rated for −40°C to +125°C operation. The SO-8 footprint (JEDEC MS-012) supports standard reflow profiles and offers 170°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BST | Bootstrap capacitor connection | Connects 0.1µF ceramic cap to LX to generate gate drive voltage for internal high-side DMOS FET; critical for proper switching. |
| 2 - VD | Internal regulator output | Provides 7.8V ±1.2V bias for gate driver; must be bypassed to GND with 0.1µF ceramic capacitor for stable startup and regulation. |
| 3 - SGND | Signal ground reference | Internal analog ground node; must be connected directly to system GND plane to prevent noise coupling into feedback path. |
| 4 - FB | Feedback sense input | Internally connected to 3.3V output for fixed-version operation; no external divider required - simplifies layout and improves stability. |
| 5 - ON/OFF | Enable/shutdown control | Logic-level input with 1.69V rising threshold and 100mV hysteresis; drives low (<0.3V) to enter 10µA shutdown state. |
| 6 - GND | Power ground return | Main power return path for LX switch current and VD regulator; must be star-connected to SGND and input/output capacitors. |
| 7 - VIN | Main input supply | Accepts 7.5V–76V; requires low-ESR input capacitor (e.g., 68µF aluminum + 0.1µF ceramic) placed adjacent to pin to suppress ripple. |
| 8 - LX | Switch node | Drains high-side DMOS source; connects to external Schottky diode cathode and inductor; high dv/dt node requiring tight layout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.4Ω high-side DMOS FET | Eliminates external MOSFET and driver, reducing BOM count and PCB area while enabling >90% efficiency at 12VIN/0.5A. |
| Internal frequency compensation | Enables stable operation with minimal external components - no loop compensation network required for standard LC filter designs. |
| Pulse-skipping light-load mode | Maintains >80% efficiency down to 10mA load while holding IQ at 270µA, extending battery life in intermittent-duty applications. |
| Automotive temperature grade (−40°C to +125°C) | Qualified per AEC-Q100 stress test requirements; supports under-hood and body-control module deployment without derating. |
| Hiccup-mode short-circuit protection | Shuts down on overcurrent, cools, then retries - prevents thermal runaway during sustained output faults without latch-up. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Power Supply |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interfaces in door module or lighting controller with 12V/24V battery input. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator supplying logic rails; handles cold-crank (6.5V) and load-dump (80V) transients via 76V rating. Use Value: 270µA quiescent current prevents parasitic battery drain during vehicle sleep mode; 125kHz switching enables compact 100µH inductor. |
Use Scenario: Generating isolated 3.3V logic supply for digital I/O cards in programmable logic controllers operating from 24V DC field bus. IC Role / Device Role / Timing Role: Non-isolated point-of-load regulator; delivers 1A with <±3.5% output tolerance across 7.5–76V input variation. Use Value: Internal 0.4Ω FET and fixed compensation reduce component count vs. controller+MOSFET solutions; SO-8 package fits dense backplane layouts. |
| Railway Onboard Telematics Unit | Off-Grid Solar Charge Controller |
Use Scenario: Converting 72V nominal traction battery to 3.3V for GPS, cellular modem, and data logging MCU in train-mounted communication systems. IC Role / Device Role / Timing Role: High-input-voltage primary DC-DC stage; withstands 100ms 100V transients per EN 50155. Use Value: 76V absolute max rating and thermal shutdown at +160°C ensure reliability in unventilated enclosures; pulse-skipping extends runtime during low-data-activity periods. |
Use Scenario: Regulating variable PV array output (up to 76V open-circuit) to stable 3.3V for embedded monitoring MCU and wireless transmitter in solar battery management systems. IC Role / Device Role / Timing Role: Input-flexible buck converter handling wide VIN swing from dawn to noon; operates down to 7.5V start-up. Use Value: UVLO at 5.2V allows operation during low-light conditions; 10µA shutdown current preserves battery charge when solar input drops below threshold. |
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 |
|---|---|---|---|
| LM5008AMMX/NOPB | Fixed 3.3V output, 75V max input, 1A current, but uses external compensation and lacks integrated VD regulator - requires additional 5V bias rail. | Requires more external components and careful loop tuning; not qualified for automotive temp range (only −40°C to +125°C with derating). | Choose when cost sensitivity outweighs design simplicity; avoid if automotive qualification or minimal BOM is required. |
| TPS54340DDAR | Adjustable output only (1.22V–58V), 42V max input, 3.5A current, no integrated VD regulator, and higher 1.5mA quiescent current. | Cannot replace MAX5035AUSA+T directly for fixed 3.3V use; unsuitable for >42V inputs like 48V industrial or 72V railway systems. | Consider only for adjustable-output designs with lower input voltage and higher current needs; not a functional substitute for MAX5035AUSA+T's fixed 3.3V/76V capability. |
Compared with LM5008AMMX/NOPB and TPS54340DDAR, MAX5035AUSA+T uniquely combines automotive-grade 76V operation, fixed 3.3V output, integrated VD regulator, and 270µA quiescent current - making it the only option among the three qualified for always-on automotive BCMs with minimal external parts.
Availability
MAX5035AUSA+T is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O power supplies, railway telematics units, and off-grid solar charge controllers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX5035AUSA+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 MAX5035 product line delivers high-efficiency, high-voltage step-down conversion for harsh-environment applications where wide input range, low IQ, and automotive qualification are mandatory - targeting body electronics, distributed power, and ruggedized embedded systems.
FAQ
What is the maximum input voltage rating for MAX5035AUSA+T?
The MAX5035AUSA+T has an absolute maximum input voltage rating of +80V, with operational specification from 7.5V to 76V. This 76V upper limit ensures reliable performance under automotive load-dump conditions (ISO 7637-2 Pulse 5a) and industrial 48V/72V bus transients. Exceeding 76V during normal operation risks violating the device's safe operating area and may trigger permanent damage.
Does MAX5035AUSA+T require external feedback resistors to set its 3.3V output?
No. The MAX5035AUSA+T is the fixed-output variant ('A' suffix) with internal feedback network configured for 3.3V regulation. Pin 4 (FB) is internally connected to the output, eliminating the need for external resistors. This reduces component count, improves accuracy (±3.5% over line/load/temp), and enhances noise immunity compared to adjustable versions like MAX5035D/E.
What thermal protection features does MAX5035AUSA+T include?
MAX5035AUSA+T incorporates thermal shutdown at +160°C junction temperature with +20°C hysteresis, causing automatic recovery at +140°C. It also includes cycle-by-cycle current limiting and hiccup-mode short-circuit protection. These features collectively prevent thermal runaway during overload, poor heatsinking, or ambient temperature excursions - critical for sealed automotive and industrial enclosures.
Can MAX5035AUSA+T operate from a 6V input source?
No. MAX5035AUSA+T requires a minimum input voltage of 7.5V to initiate and sustain regulation. Below this threshold, undervoltage lockout (UVLO) disables switching, and the device remains in shutdown. For 6V-compatible operation, a different regulator such as MAX5036 (6V min) or external UVLO circuitry would be required - MAX5035AUSA+T is not functional at 6V.
What is the purpose of the VD pin on MAX5035AUSA+T?
The VD pin on MAX5035AUSA+T outputs a regulated 7.8V ±1.2V supply used exclusively to power the internal high-side gate driver. It must be bypassed to GND with a 0.1µF ceramic capacitor placed adjacent to the pin. This dedicated regulator eliminates the need for an external bias supply and ensures robust gate drive across the full 7.5V–76V input range - a key enabler of the integrated DMOS architecture.
MAX5035AUSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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):
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX5035AUSA+T FAQ
1.How can I place an order for MAX5035AUSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035AUSA+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 MAX5035AUSA+T reliable?
The price and inventory of MAX5035AUSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035AUSA+T is usually 5 days.
3.What payment methods are accepted for MAX5035AUSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035AUSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035AUSA+T?
MAX5035AUSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035AUSA+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 MAX5035AUSA+T?
For technical support, including MAX5035AUSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035AUSA+T requirements.
6.How does Aetrix verify that MAX5035AUSA+T is sourced from the original manufacturer or authorized distributors?
All MAX5035AUSA+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 MAX5035AUSA+T meets industry standards.
7.What is the process for return or replacement of MAX5035AUSA+T?
All MAX5035AUSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035AUSA+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 MAX5035AUSA+T part is unused and in its original packaging.
Return procedure for MAX5035AUSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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