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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:3,826
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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 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 automatic pulse-skipping mode for light-load efficiency. Used in automotive power supplies where wide-input, high-reliability regulation is required.
For engineers reviewing the MAX5035BASA datasheet, MAX5035BASA pinout, MAX5035BASA application, or MAX5035BASA equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade (-40°C to +125°C) operation, and real-world design meaning for each key specification - all tied explicitly to the MAX5035BASA/V+ ordering variant.
Technical Context
The MAX5035BASA implements voltage-mode PWM control with voltage feed-forward, enabling stable regulation across its 7.5V–76V input range while maintaining tight output accuracy (±2.5% over line/load/temperature). Its internal 0.4Ω high-side DMOS switch and integrated gate driver eliminate external drive components, and the BST–LX bootstrap circuit enables efficient high-side N-channel FET operation.
It features dual protection architecture: cycle-by-cycle current limiting (1.3–2.5A peak) combined with hiccup-mode short-circuit response, plus thermal shutdown at +160°C with 20°C hysteresis. The device enters pulse-skipping mode below ~85mA load to sustain 90% efficiency at 0.5A and 270µA quiescent draw at no load - critical for always-on automotive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports direct connection to 12V/24V/48V vehicle batteries including cold-crank and load-dump transients. |
| Output Voltage | Fixed 5.0V ±2.5% - tightly regulated for powering microcontrollers, sensors, and CAN transceivers without external feedback resistors. |
| Max Output Current | 1A continuous - limited by package thermal resistance (170°C/W for SO-8); derates above +70°C ambient. |
| Switching Frequency | 125kHz (109–137kHz range) - enables use of compact 100µH inductors and reduces EMI compared to higher-frequency alternatives. |
| Quiescent Current | 270µA at no load - ensures minimal battery drain in sleep-mode automotive ECUs and telematics modules. |
| Shutdown Current | 10µA typical - allows full system power gating via ON/OFF pin without compromising standby battery life. |
| Internal High-Side RDS(ON) | 0.4Ω max - reduces conduction loss and improves full-load efficiency up to 90% at 12VIN/5VOUT/0.5A. |
Pinout & Package
MAX5035BASA is housed in an 8-pin SO (Small Outline) package rated for automotive temperature range (-40°C to +125°C), with exposed pad not electrically connected. Thermal resistance θJA = 170°C/W (JEDEC 51).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 1) | Bootstrap capacitor connection | Connects 0.1µF ceramic cap between BST and LX to generate gate drive voltage for internal high-side DMOS FET. |
| VD (Pin 2) | Internal regulator output | Provides ~7.8V bias for internal analog/digital blocks; bypassed to GND with 0.1µF ceramic capacitor. |
| SGND (Pin 3) | Signal ground reference | Internal analog ground node; must be connected directly to system GND to maintain feedback accuracy. |
| FB (Pin 4) | Feedback sense input | Internally tied to 5V output for MAX5035BASA; no external divider needed - simplifies layout and improves stability. |
| ON/OFF (Pin 5) | Enable/shutdown control | Logic-high (>1.69V) enables regulation; logic-low (<1.53V) disables switching and reduces supply current to 10µA. |
| GND (Pin 6) | Power ground return | Main return path for high-current LX switching node and internal regulator; connects to PCB star ground point. |
| VIN (Pin 7) | Main input supply | Accepts 7.5–76V DC; requires low-ESR input capacitor (e.g., 68µF aluminum + 0.1µF ceramic) placed adjacent to pin. |
| LX (Pin 8) | Switch node | Drives external Schottky diode (e.g., 50SQ100) and inductor; high dv/dt node requiring short, low-inductance routing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.4Ω high-side DMOS FET | Eliminates need for external MOSFET and driver, reducing BOM count and PCB area in space-constrained automotive modules. |
| Internal frequency compensation | Enables stable operation with standard LC filter components (e.g., 100µH inductor + 68µF output cap) without external compensation network. |
| Pulse-skipping light-load mode | Maintains >85% efficiency down to 10mA load while holding quiescent current at 270µA - essential for always-on vehicle networks. |
| Hiccup-mode short-circuit protection | Automatically cycles on/off during sustained overload, limiting average power dissipation and preventing thermal runaway. |
| Automotive-grade temperature range | Qualified from -40°C to +125°C junction temperature with production-tested limits - meets AEC-Q100 stress requirements for under-hood use. |
Applications
| Body Control Module (BCM) | Advanced Driver Assistance System (ADAS) Camera Power |
|---|---|
Use Scenario: Regulating 12V battery input to stable 5V for microcontroller, LIN transceiver, and sensor interface in door module or lighting controller. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering clean, protected 5V rail with fast transient response to PWM-driven loads. Use Value: 270µA quiescent current prevents excessive battery drain during vehicle sleep mode; 76V input withstands ISO 7637-2 pulse 5a load dump. |
Use Scenario: Powering image sensor and ISP in rear-view or surround-view camera modules mounted in hot under-hood or bumper locations. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter providing thermally robust 5V supply with built-in thermal shutdown at +160°C. Use Value: Automotive temperature rating (-40°C to +125°C) and hiccup-mode protection ensure reliable operation despite ambient extremes and fault conditions. |
| Telematics Control Unit (TCU) | Electronic Parking Brake (EPB) Actuator Interface |
Use Scenario: Generating 5V for cellular modem, GNSS receiver, and CAN FD controller in fleet management units exposed to wide battery voltage swings. IC Role / Device Role / Timing Role: High-input-voltage buck converter with UVLO and ON/OFF control enabling controlled power sequencing during ignition cycles. Use Value: 7.5–76V input range covers cranking (6.5V), nominal (13.8V), and load-dump (up to 76V) events without external protection circuitry. |
Use Scenario: Supplying 5V to motor driver logic and position sensor interface in EPB actuators located near brake calipers. IC Role / Device Role / Timing Role: Safety-relevant power stage delivering regulated 5V with cycle-by-cycle current limit and thermal shutdown per ISO 26262 ASIL-B support. Use Value: Internal 1.3–2.5A peak current limit protects against stalled motor faults; thermal hysteresis prevents oscillation during sustained overload. |
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 |
|---|---|---|---|
| LM5017MH/NOPB | 42V max input, 100kHz fixed frequency, requires external compensation; no integrated VD regulator. | Not qualified for automotive temp range; lacks hiccup-mode protection and 76V input capability. | Choose LM5017MH/NOPB only for industrial 24V systems where cost is prioritized over automotive qualification and input voltage margin. |
| TPS54160DGQ | 60V max input, adjustable output only, 1.3MHz switching, higher IQ (116µA) but no pulse-skipping mode. | Lower thermal robustness (–40°C to +125°C not production-tested); no internal VD rail or BST driver. | Prefer TPS54160DGQ when board space is constrained and high-frequency operation justifies trade-offs in light-load efficiency and automotive compliance. |
Compared with LM5017MH/NOPB and TPS54160DGQ, the MAX5035BASA uniquely combines 76V input tolerance, automotive temperature qualification, integrated VD bias rail, and pulse-skipping mode - making it the only drop-in solution for 5V generation in harsh-environment automotive ECUs without redesigning feedback or gate-drive circuitry.
Availability
MAX5035BASA is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera power supplies, and telematics control units requiring stable component supply across extended temperature and voltage ranges.
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 automotive subsystems requiring robust, wide-input regulation with minimal external components and guaranteed AEC-Q100 reliability.
FAQ
What is the maximum input voltage supported by the MAX5035BASA?
The MAX5035BASA supports an absolute maximum input voltage of +80V, with continuous operation specified from 7.5V to 76V. This range accommodates automotive battery transients including ISO 7637-2 Pulse 5a (load dump), ensuring reliable operation without external clamping circuitry. The MAX5035BASA maintains regulation and protection functionality across this full span.
Does the MAX5035BASA require external feedback resistors to set the output voltage?
No, the MAX5035BASA does not require external feedback resistors. As a fixed 5V output variant, its FB pin is internally connected to the regulated 5V output. This eliminates resistor selection errors, improves long-term stability, and reduces component count - a key advantage over adjustable regulators like the MAX5035DASA.
How does the MAX5035BASA achieve low quiescent current in automotive standby mode?
The MAX5035BASA achieves 270µA quiescent current at no load through automatic transition into pulse-skipping mode below ~85mA output current. In this mode, the controller skips switching cycles while maintaining regulation, minimizing switching losses. During full shutdown (ON/OFF = low), it draws only 10µA - critical for meeting automotive OEM sleep-current budgets.
What thermal protection mechanisms are implemented in the MAX5035BASA?
The MAX5035BASA incorporates thermal shutdown at +160°C junction temperature with 20°C hysteresis, causing it to enter hiccup mode under sustained overload. It also includes cycle-by-cycle current limiting (1.3–2.5A peak) and undervoltage lockout (5.2V typical), forming a multi-layer protection scheme that prevents damage during fault conditions without requiring external circuitry.
Can the MAX5035BASA be used with a 100µH inductor as shown in the typical application circuit?
Yes, the MAX5035BASA is validated with a 100µH inductor (e.g., Coilcraft DO5022P-104) in its typical 5V application circuit. This value is optimized for 125kHz operation, 5V output, and 1A load - delivering <5% output ripple and stable regulation. Inductor saturation current must exceed the peak switch current limit (≥2.5A) to avoid core saturation and efficiency loss.
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:
- 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 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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