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Analog Devices Inc./Maxim Integrated MAX5035BASA-T
- Part No.:
- MAX5035BASA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5035BASA-T.pdf
- Description:
- IC REG BUCK 5V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,073
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Product details
Overview
The MAX5035BASA-T from Maxim Integrated is a high-voltage, 1A step-down DC-DC converter with fixed 5V 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 range and AEC-Q100–compatible thermal performance (−40°C to +125°C) are required.
For engineers reviewing the MAX5035BASA-T datasheet, MAX5035BASA-T pinout, MAX5035BASA-T application, or MAX5035BASA-T equivalent, key selection criteria include its 76V max input rating, 5V ±1.5% output accuracy over temperature and load, hiccup-mode short-circuit protection, thermal shutdown at +160°C, and SO-8 package compatibility with automotive PCB layouts.
Technical Context
The MAX5035BASA-T employs voltage-mode control with feed-forward compensation and an internal high-side N-channel DMOS switch. Its fixed 125kHz oscillator enables predictable EMI filtering, while automatic transition to pulse-skipping mode below ~85mA load maintains >85% efficiency down to 10mA.
Undervoltage lockout activates at 5.2V (typ), and the ON/OFF pin features 1.69V rising threshold with 100mV hysteresis for reliable enable/disable sequencing. The BST pin drives the high-side gate via a 0.1µF bootstrap capacitor, and FB pin regulates output using internal 1.22V reference - though unused in fixed-output MAX5035B variants.
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 transient tolerance up to 80V. |
| Output Voltage | 5.0V ±1.5% (4.85V–5.15V) - tightly regulated across −40°C to +125°C and 20mA–1A load. |
| Max Output Current | 1A continuous - limited by SO-8 package thermal resistance (170°C/W) and internal 1.9A peak switch current limit. |
| Quiescent Current | 270µA (typ) at no load - enables always-on subsystems in vehicle infotainment or telematics without excessive battery drain. |
| Switching Frequency | 125kHz (105–137kHz) - balances inductor size, EMI, and efficiency; fixed-frequency simplifies filter design. |
| Shutdown Current | 10µA (typ) - ensures ultra-low standby power when ON/OFF pin is pulled low. |
| Thermal Shutdown | +160°C junction with +20°C hysteresis - protects against sustained overload or poor heatsinking in enclosed enclosures. |
Pinout & Package
MAX5035BASA-T is housed in an 8-pin SO (Small Outline) package, JEDEC MS-012AC, with exposed pad not electrically connected. Pin 1 (BST) requires a 0.1µF ceramic capacitor to LX; Pin 2 (VD) supplies internal gate drive and must be bypassed to GND; Pin 4 (FB) is internally tied to output for fixed 5V operation; Pin 5 (ON/OFF) controls enable/disable with 1.69V threshold; Pin 8 (LX) connects to external inductor and Schottky diode cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 1) | Bootstrap capacitor connection | Provides gate-drive voltage for internal high-side DMOS; requires 0.1µF ceramic cap between BST and LX. |
| VD (Pin 2) | Internal regulator output | Supplies gate driver and analog circuitry; must be bypassed with 0.1µF ceramic cap to GND. |
| SGND (Pin 3) | Signal ground reference | Internally connected to GND; must be tied to system ground plane at single-point star node. |
| FB (Pin 4) | Feedback input | Internally connected to 5V output; no external divider needed for MAX5035B variant. |
| ON/OFF (Pin 5) | Enable/shutdown control | Pull low (<0.8V) to enter 10µA shutdown; rising threshold 1.69V with 100mV hysteresis. |
| GND (Pin 6) | Power ground return | Main ground path for LX current return and thermal dissipation; connect to large copper area. |
| VIN (Pin 7) | Main input supply | Accepts 7.5V–76V; requires low-ESR input capacitor (e.g., 68µF aluminum + 0.1µF ceramic) near pin. |
| LX (Pin 8) | Switch node | Connects to inductor and Schottky diode cathode; high dv/dt node requiring short, low-inductance routing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.4Ω high-side DMOS FET | Eliminates external MOSFET and gate driver, reducing BOM count and layout complexity in space-constrained modules. |
| Internal frequency compensation | Enables stable operation with minimal external components - no loop compensation network required for standard LC filters. |
| Hiccup-mode short-circuit protection | Prevents thermal runaway during sustained output shorts by cycling on/off until fault clears, preserving device reliability. |
| Automotive-grade temperature range | Rated for −40°C to +125°C junction operation - qualified for under-hood and engine-control applications per AEC-Q100 stress test profiles. |
| Low-noise pulse-skipping mode | Maintains >85% efficiency at 10mA load while avoiding audible switching noise common in burst-mode converters. |
Applications
| Automotive Body Control Module (BCM) | Industrial Programmable Logic Controller (PLC) I/O Power |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface circuits in BCMs supplied from 12V battery with load-dump transients up to 60V. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering clean, regulated power with fast transient response to handle solenoid actuation spikes. Use Value: 76V input rating withstands ISO 7637-2 Pulse 5a transients; 1A output supports multiple peripherals; 270µA IQ extends battery life in sleep mode. | Use Scenario: Supplies isolated 5V logic rails for digital I/O modules in factory automation PLCs operating from 24V DC field buses. IC Role / Device Role / Timing Role: Front-end DC-DC stage converting unregulated 24V bus to stable 5V for FPGA configuration, level shifters, and optocoupler drivers. Use Value: Wide 7.5–76V input accommodates brownout and overvoltage conditions; thermal shutdown prevents failure during ambient +70°C cabinet operation. |
| Railway Onboard Signaling Unit | Commercial HVAC Zone Controller |
Use Scenario: Powers safety-critical signaling logic and RS-485 transceivers in EN 50155-compliant train subsystems powered from 72V nominal traction battery. IC Role / Device Role / Timing Role: High-reliability 5V source with hiccup-mode protection against wiring faults in distributed rail networks. Use Value: 160°C thermal shutdown and −40°C to +125°C operation meet EN 50155 Class TX requirements; 10µA shutdown current enables remote wake-up capability. | Use Scenario: Provides 5V power to microcontroller, display, and wireless (Wi-Fi/BLE) SoC in wall-mounted HVAC thermostats powered from 24V AC-to-DC adapters. IC Role / Device Role / Timing Role: Efficient local regulation replacing linear regulators to reduce heat in sealed plastic enclosures. Use Value: 90% efficiency at 500mA reduces thermal load; SO-8 package fits compact 2-layer PCBs; PFM mode eliminates audible noise during nighttime operation. |
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, 500mA output, 1MHz switching, no integrated compensation | Lower current rating limits use to sub-500mA loads; requires external compensation network | Select when higher switching frequency is needed for smaller magnetics and board space is constrained. |
| TPS54360BQDDARQ1 | 3.5V–60V input, 3.5A output, 100kHz–2.5MHz adjustable frequency, integrated soft-start | Higher current and wider frequency range but lower max input voltage (60V vs. 76V) | Choose for automotive applications needing >1A output or programmable frequency, accepting reduced transient voltage margin. |
Compared with LM5008AMM/NOPB and TPS54360BQDDARQ1, the MAX5035BASA-T offers superior 76V input tolerance and built-in compensation for simpler design, while trading off maximum output current and frequency flexibility - making it optimal for robust 1A, 5V automotive and industrial point-of-load conversion.
Availability
MAX5035BASA-T is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, railway signaling units, and commercial HVAC controllers requiring stable component supply across extended temperature and high-input-voltage conditions.
Supply support for MAX5035BASA-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 buck converters targeting automotive and industrial power systems where wide input range, low quiescent current, and AEC-Q100–ready reliability are essential.
FAQ
What is the maximum input voltage rating for the MAX5035BASA-T?
The MAX5035BASA-T has an absolute maximum input voltage rating of +80V, with continuous operation specified from 7.5V to 76V. This allows reliable use in 12V, 24V, and 48V automotive and industrial systems subject to load-dump transients per ISO 7637-2. Operation above 76V is permissible only for brief transients within the absolute maximum ratings, not for steady-state conditions.
Does the MAX5035BASA-T require external compensation components?
No, the MAX5035BASA-T includes internal frequency compensation optimized for stability with standard LC output filters. Unlike many buck controllers, it does not require external Type II or Type III compensation networks - simplifying design and reducing component count. This is confirmed in the datasheet's "Internal Frequency Compensation" feature and typical application circuit.
How is the 5V output voltage set on the MAX5035BASA-T?
The MAX5035BASA-T is a fixed-output variant: its 5V regulation is implemented internally, with the FB pin pre-connected to the output. No external resistor divider is needed - simply connect FB directly to VOUT as shown in the typical application circuit. This differs from adjustable versions (MAX5035D/E), which require an external R1/R2 network to set VOUT between 1.25V and 13.2V.
What thermal protection mechanisms does the MAX5035BASA-T include?
The MAX5035BASA-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 that disables switching during sustained overloads, preventing thermal runaway and enabling safe fault clearing without latch-up.
Can the MAX5035BASA-T operate with an input voltage below 7.5V?
No - the MAX5035BASA-T is not specified for operation below 7.5V input. Its undervoltage lockout triggers at 5.2V (typ), but functional operation begins only above 7.5V due to internal regulator (VD) dropout and minimum duty cycle constraints. Attempting operation below 7.5V may result in unstable regulation, reduced efficiency, or failure to start; for lower-VIN applications, consider the MAX5033 or MAX5036 families.
MAX5035BASA-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:
- 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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 125kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX5035BASA-T FAQ
1.How can I place an order for MAX5035BASA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035BASA-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 MAX5035BASA-T reliable?
The price and inventory of MAX5035BASA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035BASA-T is usually 5 days.
3.What payment methods are accepted for MAX5035BASA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035BASA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035BASA-T?
MAX5035BASA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035BASA-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 MAX5035BASA-T?
For technical support, including MAX5035BASA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035BASA-T requirements.
6.How does Aetrix verify that MAX5035BASA-T is sourced from the original manufacturer or authorized distributors?
All MAX5035BASA-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 MAX5035BASA-T meets industry standards.
7.What is the process for return or replacement of MAX5035BASA-T?
All MAX5035BASA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035BASA-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 MAX5035BASA-T part is unused and in its original packaging.
Return procedure for MAX5035BASA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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