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Analog Devices Inc./Maxim Integrated MAX5035BASA+
- Part No.:
- MAX5035BASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5035BASA+.pdf
- Description:
- IC REG BUCK 5V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:572
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Product details
Overview
MAX5035BASA+ 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 delivering up to 90% efficiency at 0.5A load. It integrates a 0.4Ω high-side DMOS FET, internal frequency compensation, and operates over –40°C to +125°C for automotive power rails in engine control units and ADAS sensors.
For engineers reviewing the MAX5035BASA+ datasheet, MAX5035BASA+ pinout, MAX5035BASA+ application, or MAX5035BASA+ equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specs across temperature, and real-world design constraints for high-input-voltage buck conversion.
Technical Context
The MAX5035BASA+ uses voltage-mode PWM control with feed-forward compensation and fixed 125kHz switching (105–137kHz over temp), automatically transitioning to pulse-skipping mode below ~85mA load to maintain 270µA quiescent current. Its internal 7.8V regulator (VD) powers gate drive and analog circuitry.
Undervoltage lockout triggers at 5.2V (typ) on VIN; shutdown is controlled via ON/OFF pin with 1.69V rising threshold and 100mV hysteresis. Thermal shutdown activates at +160°C with +20°C hysteresis, and hiccup-mode short-circuit protection limits fault energy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports wide automotive battery transients including cold-crank (6.5V min) and load-dump (80V abs max). |
| Output Voltage | Fixed 5.0V ±2.5% (4.85–5.15V) - stable for microcontroller I/O, CAN transceivers, and sensor biasing without external feedback resistors. |
| Max Output Current | 1A continuous - limited by SO package thermal resistance (170°C/W) and internal 1.9A peak switch current limit (ILIM). |
| Quiescent Current | 270µA (typ) at no load - enables always-on systems like telematics and alarm controllers without excessive battery drain. |
| Shutdown Current | 10µA (typ) - ensures <1µA system standby when ON/OFF pin is pulled low, critical for key-off power budgeting. |
| Switch On-Resistance | 0.4Ω (typ) - reduces conduction loss and improves efficiency above 0.2A, especially at high VIN (e.g., 48V input → 5V/1A). |
| Oscillator Frequency | 125kHz (105–137kHz over temp) - balances EMI suppression, inductor size (100µH typical), and light-load PFM transition point. |
Pinout & Package
MAX5035BASA+ is housed in an 8-pin SO (Small Outline) package rated for –40°C to +125°C operation, with exposed pad not electrically connected. The SO package has 170°C/W junction-to-ambient thermal resistance (JEDEC 51).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor connection | Connects 0.1µF ceramic cap between BST and LX to generate gate drive voltage for internal high-side DMOS switch. |
| VD | Internal regulator output | Provides ~7.8V regulated supply for internal logic and gate driver; bypassed to GND with 0.1µF ceramic capacitor. |
| SGND | Signal ground reference | Internal analog ground node; must be tied directly to system GND plane to avoid control-loop instability. |
| FB | Feedback sense input | Internally connected to 5V output; no external divider required for MAX5035BASA+ (fixed-output variant). |
| ON/OFF | Enable/shutdown control | Logic-level input: <1.5V = shutdown (10µA IQ), >1.85V = active; 100mV hysteresis prevents chatter near threshold. |
| GND | Power ground return | Main return path for high-current LX switching node and VD regulator; must be low-impedance star-point connection. |
| VIN | Main input supply | Accepts 7.5–76V DC; requires local low-ESR input capacitor (e.g., 68µF aluminum + 0.1µF ceramic) placed adjacent to pin. |
| LX | Switch node | Drives external Schottky diode (e.g., 50SQ100); connects to inductor and diode cathode; experiences full VIN-to-GND swing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side DMOS FET | 0.4Ω RDS(ON) eliminates external MOSFET and driver, reducing BOM count and layout complexity for compact 5V supplies. |
| Internal frequency compensation | Enables stable loop response with only two external components (inductor + output cap), eliminating need for compensation network tuning. |
| Pulse-skipping light-load mode | Maintains >85% efficiency down to 10mA load, avoiding linear-regulator-like IQ penalty while preserving regulation accuracy. |
| Hiccup-mode short-circuit protection | Shuts down for 10ms after overcurrent detection, then retries - limits average power dissipation during sustained output shorts. |
| Automotive-grade temperature range | –40°C to +125°C operation with guaranteed specs (not just qualified), enabling placement near engines or under-hood ECUs. |
Applications
| Engine Control Unit (ECU) Power Supply | ADAS Camera Module Bias Rail |
|---|---|
Use Scenario: Powers 32-bit MCU, CAN transceiver, and analog front-end in gasoline/diesel engine control modules exposed to 12V/24V battery with load-dump spikes. IC Role / Device Role / Timing Role: Primary 5V buck regulator converting raw battery to clean, regulated 5V with UVLO and thermal protection. Use Value: Withstands 76V input and delivers 1A continuously at +125°C ambient, eliminating need for pre-regulator stages in under-hood designs. | Use Scenario: Supplies image sensor, ISP, and serializer in forward-facing radar/camera fusion modules requiring low-noise, always-on 5V rail. IC Role / Device Role / Timing Role: Always-on 5V source with 270µA quiescent current, enabling wake-on-event functionality without draining 12V battery. Use Value: Pulse-skipping mode maintains regulation at µA-level loads while preserving fast transient response (<400µs soft-start) for rapid camera boot. |
| Industrial PLC I/O Module | Railway Signaling Interface |
Use Scenario: Provides isolated 5V supply for digital I/O conditioning, optocoupler drivers, and fieldbus PHYs in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: High-reliability 5V DC-DC stage accepting wide-range 24V/48V industrial bus inputs with hiccup-mode fault containment. Use Value: 170°C/W θJA and +160°C thermal shutdown enable operation in sealed enclosures up to +70°C ambient without forced air cooling. | Use Scenario: Powers Ethernet PHY, RS-485 transceivers, and safety-monitoring MCU in EN 50121-compliant railway signaling equipment. IC Role / Device Role / Timing Role: Input-filter tolerant 5V regulator handling 76V surges per EN 50121-3-2, with shutdown control for fail-safe power sequencing. Use Value: 10µA shutdown current and 5.2V UVLO ensure safe power-down during brownout events common in traction power systems. |
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 | Fixed 5V output, 100V max input, 500mA max output, no integrated VD regulator | Lower current capability; requires external bias supply for gate drive; less suitable for 1A automotive loads | Select when input exceeds 76V or board space allows external bias generation |
| TPS54360DGQR | Adjustable output (1.22V–60V), 60V max input, 3.5A output, external MOSFETs | Higher current but requires external high-side FET and driver; no integrated VD or BST circuit | Select when adjustable output or >1A output is required, and layout can accommodate discrete FETs |
Compared with LM5008AMM/NOPB and TPS54360DGQR, MAX5035BASA+ offers higher integration (integrated 0.4Ω FET, VD regulator, BST circuit), guaranteed 1A output at +125°C, and lower quiescent current - making it optimal for space-constrained, high-temp 5V automotive and industrial rails where simplicity and reliability are prioritized over adjustability or ultra-high current.
Availability
MAX5035BASA+ is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera modules, and industrial PLC I/O requiring stable component supply across extended temperature and high-input-voltage conditions.
Supply support for MAX5035BASA+ 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 MAX5035BASA+ belongs to the MAXPower™ family of high-voltage DC-DC converters engineered specifically for robust, high-efficiency buck regulation in harsh environments - targeting automotive subsystems, railway electronics, and industrial controls where input transients and temperature extremes are routine.
FAQ
What is the maximum input voltage rating for MAX5035BASA+?
The MAX5035BASA+ has an absolute maximum input voltage rating of +80V, with continuous operation specified from 7.5V to 76V. This allows reliable use in 24V and 48V automotive and industrial systems experiencing load-dump transients up to 76V, as defined in ISO 16750-2. Operation beyond 76V is not recommended for sustained duty.
Does MAX5035BASA+ require external feedback resistors to set the 5V output?
No, MAX5035BASA+ does not require external feedback resistors. As a fixed-output variant (5.0V), its FB pin is internally connected to the regulated output. External resistors are only needed for adjustable versions (MAX5035D/E). Connecting FB directly to VOUT completes the internal regulation loop for MAX5035BASA+.
How does the thermal shutdown behavior work in MAX5035BASA+?
MAX5035BASA+ activates thermal shutdown at +160°C junction temperature, turning off the internal high-side switch and entering hiccup mode. It remains latched off until the die cools to +140°C (20°C hysteresis), then attempts restart. This protects against sustained overload or poor heatsinking while allowing automatic recovery once temperature normalizes - critical for unattended industrial deployments.
Can MAX5035BASA+ operate with a 6V input supply?
No, MAX5035BASA+ cannot operate reliably at 6V input. Its undervoltage lockout (UVLO) activates below 5.2V (typ), and the minimum recommended operating input is 7.5V. At 6V, the device will not start or will shut down intermittently. For sub-7.5V applications, consider a different regulator such as MAX5036 or a pre-buck stage.
What external components are mandatory for basic MAX5035BASA+ operation?
Four external components are mandatory: (1) 0.1µF ceramic BST capacitor between BST and LX, (2) 0.1µF ceramic VD bypass capacitor from VD to GND, (3) input bulk capacitor (e.g., 68µF aluminum + 0.1µF ceramic) at VIN, and (4) Schottky freewheeling diode (e.g., 50SQ100) from LX to GND. An inductor (e.g., 100µH) and output capacitor (e.g., 68µF) complete the minimal functional circuit.
MAX5035BASA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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):
- 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+ FAQ
1.How can I place an order for MAX5035BASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035BASA+ 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+ reliable?
The price and inventory of MAX5035BASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035BASA+ is usually 5 days.
3.What payment methods are accepted for MAX5035BASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035BASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035BASA+?
MAX5035BASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035BASA+ 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+?
For technical support, including MAX5035BASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035BASA+ requirements.
6.How does Aetrix verify that MAX5035BASA+ is sourced from the original manufacturer or authorized distributors?
All MAX5035BASA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX5035BASA+?
All MAX5035BASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035BASA+, 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+ part is unused and in its original packaging.
Return procedure for MAX5035BASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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