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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:10,594
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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 delivering up to 90% efficiency at 0.5A load. It integrates a 0.4Ω high-side DMOS FET, internal frequency compensation, and automotive-grade -40°C to +125°C operation in an 8-pin SO package. It serves as the primary power stage in rugged industrial and automotive power supplies.
For engineers reviewing the MAX5035BASA+T datasheet, MAX5035BASA+T pinout, MAX5035BASA+T application, or MAX5035BASA+T equivalent, key selection criteria include its 5V fixed output accuracy (±2.5%), 270µA no-load quiescent current, 125kHz fixed-frequency PWM with pulse-skipping mode, thermal shutdown at +160°C, and undervoltage lockout at 5.2V.
Technical Context
This voltage-mode buck regulator uses feed-forward control and an internal high-side N-channel DMOS switch to maintain regulation across wide input ranges. Its fixed 125kHz oscillator operates in PWM mode under heavy loads and transitions automatically to pulse-skipping mode below ~85mA to sustain high light-load efficiency.
The device includes integrated protection: cycle-by-cycle current limiting (1.9A typical peak switch limit), hiccup-mode short-circuit response, thermal shutdown with 20°C hysteresis, and internal UVLO. The FB pin regulates to 1.221V for fixed-output variants, with output set directly via internal resistor divider - no external feedback required for MAX5035BASA+T.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports wide-range industrial and automotive battery inputs including 12V, 24V, and 48V systems with headroom for transients. |
| Output Voltage | 5.0V ±2.5% - tightly regulated fixed output suitable for powering microcontrollers, sensors, and logic without external feedback components. |
| Max Output Current | 1A - limited by thermal dissipation in SO package; derates above +70°C at 5.9mW/°C. |
| Quiescent Current | 270µA at no load - enables low-power standby operation in always-on systems such as telematics and remote monitoring. |
| Switching Frequency | 125kHz (105–137kHz over temp) - balances EMI control, inductor size, and efficiency; fixed-frequency simplifies EMI filtering design. |
| Thermal Shutdown | +160°C junction temperature with +140°C restart hysteresis - provides robust fault recovery in enclosed or high-ambient environments. |
| Shutdown Current | 10µA typical - allows deep-sleep power gating via ON/OFF pin while preserving system-level energy budgets. |
Pinout & Package
MAX5035BASA+T is housed in an 8-pin SO (Small Outline) package, JEDEC MS-012AC, with exposed pad not electrically connected. Package dimensions: 4.9mm × 3.9mm × 1.75mm, lead pitch 1.27mm. Thermal resistance θJA = 170°C/W (JEDEC 51).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Boost capacitor connection | Connects 0.1µF ceramic capacitor to LX to generate gate drive voltage for internal high-side DMOS switch. |
| VD | Internal regulator output | Provides ~7.8V regulated supply for internal circuitry; bypassed to GND with 0.1µF ceramic capacitor. |
| SGND | Signal ground reference | Internal analog ground node; must be tied to main PCB ground plane at single-point star location. |
| FB | Feedback sense input | Internally connected to 5V output divider; no external components needed for MAX5035BASA+T. |
| ON/OFF | Enable/shutdown control | Logic-level input: <1.5V disables regulator (10µA ISHDN); >1.69V enables operation with 100mV hysteresis. |
| GND | Power ground return | Main power return path for LX switch current and VD regulator; connects to PCB ground plane. |
| VIN | Main input supply | Accepts 7.5–76V DC; requires local low-ESR bypass capacitor (e.g., 68µF aluminum + 0.1µF ceramic). |
| LX | Switch node | Drives external inductor; connects internally to source of high-side DMOS; carries high di/dt switching current. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.4Ω high-side DMOS FET | Reduces external component count and conduction losses; enables compact 5V/1A solution with minimal BOM cost. |
| Internal frequency compensation | Eliminates need for external compensation network - simplifies layout and ensures stable loop response across all operating conditions. |
| Pulse-skipping mode at light loads | Maintains >80% efficiency down to ~10mA load, critical for battery-powered or intermittent-duty applications. |
| Automotive temperature range (-40°C to +125°C) | Qualified for under-hood and industrial control environments where ambient extremes demand guaranteed performance. |
| 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. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface circuits in vehicle door modules and lighting controllers. IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying core logic rails from 12V battery with transient ride-through capability. Use Value: Delivers 1A at 90% efficiency across cold-crank (6.5V) to load-dump (76V) conditions while consuming only 270µA in sleep mode. | Use Scenario: Provides isolated 5V rail for digital I/O expansion cards in programmable logic controllers operating in factory environments. IC Role / Device Role / Timing Role: Main DC-DC converter generating stable 5V from 24V industrial bus, supporting hot-swap and brownout resilience. Use Value: Withstands 76V surges per IEC 61000-4-5, maintains regulation during 10ms dips to 7.5V, and features thermal shutdown for enclosure overheating. |
| Ruggedized Telematics Unit | Off-Grid Solar Charge Controller |
Use Scenario: Supplies 5V to GPS module, cellular modem, and MCU in fleet-tracking hardware mounted in commercial vehicles. IC Role / Device Role / Timing Role: High-input-voltage buck converter enabling direct connection to vehicle battery without pre-regulation. Use Value: Operates continuously at +105°C ambient, achieves <10µA shutdown current for multi-year battery backup, and resists vibration-induced solder fatigue via SO package. | Use Scenario: Generates 5V auxiliary power for controller logic and display in solar charge regulators interfacing with 48V battery banks. IC Role / Device Role / Timing Role: Secondary power stage converting variable PV array or battery voltage (up to 76V) to clean 5V system rail. Use Value: Maintains >86% efficiency at 12V input (low-light condition) and >90% at 48V (full sun), with UVLO preventing startup below safe battery voltage. |
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, 100kHz switching, 500mA max output, no integrated high-side FET (external MOSFET required) | Lower current capability; requires external power stage and compensation - larger footprint and higher design complexity | Select when lower cost per watt is prioritized over integration and board space; verify thermal margin at full 1A load. |
| TPS54360DGQR | Adjustable output (1.22V–60V), 3.5A output, 100kHz–2.5MHz programmable frequency, integrated 95mΩ FET | Higher current and wider VOUT flexibility but lacks AEC-Q100 qualification and automotive temp range | Choose for non-automotive designs needing >1A or adjustable output; avoid where -40°C to +125°C operation is mandatory. |
Compared with LM5008AMM/NOPB and TPS54360DGQR, the MAX5035BASA+T offers superior integration (no external FET), guaranteed automotive temperature operation, and optimized light-load efficiency via pulse-skipping - making it ideal for space-constrained, thermally demanding 5V/1A applications where reliability trumps raw current headroom.
Availability
MAX5035BASA+T is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, and ruggedized telematics requiring stable component supply across extended temperature and long product lifecycles.
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 belongs to Maxim's MAXPower™ high-voltage DC-DC converter family, engineered specifically for reliable 7.5V–76V input conversion in harsh environments where efficiency, thermal resilience, and functional safety are critical.
FAQ
What is the output voltage tolerance of the MAX5035BASA+T under full load and temperature?
The MAX5035BASA+T delivers a nominal 5.0V output with ±2.5% tolerance (4.85V to 5.15V) across the full -40°C to +125°C temperature range and 20mA to 1A load current, as specified in the Electrical Characteristics table for VIN = 7.5V to 76V. This tight regulation is achieved using an internal feedback divider referenced to a 1.221V bandgap, eliminating external resistor drift errors.
Does the MAX5035BASA+T require external compensation components?
No, the MAX5035BASA+T includes fully internal frequency compensation optimized for stability with standard external LC filter components. The datasheet explicitly states "internal frequency compensation simplifying circuit implementation" and warns against adding external compensation networks, which would destabilize the control loop. This eliminates tuning effort and improves design reproducibility.
How does the MAX5035BASA+T handle short-circuit conditions on the output?
The MAX5035BASA+T employs hiccup-mode short-circuit protection: upon detecting overcurrent, it shuts down the internal switch, waits a fixed interval, then attempts restart. If the fault persists, it repeats the cycle. This limits average power dissipation, prevents thermal runaway, and avoids damage to the IC or external rectifier - unlike latch-off or constant-current modes that could overheat under sustained shorts.
Can the MAX5035BASA+T operate with an input voltage below 7.5V?
No - the absolute minimum input voltage for functional operation is 7.5V, as defined in the Absolute Maximum Ratings and Electrical Characteristics tables. Below this, the internal UVLO circuit prevents startup, and the internal VD regulator cannot sustain bias. Attempting operation at 6V or lower will result in no output regulation or erratic behavior; the internal undervoltage lockout threshold is 5.2V (typ), but functional operation requires ≥7.5V.
What is the recommended input capacitor configuration for the MAX5035BASA+T?
Maxim recommends a parallel combination: a bulk 68µF low-ESR aluminum electrolytic capacitor (e.g., Panasonic EEVFK2A680Q) plus a 0.1µF ceramic capacitor placed immediately adjacent to the VIN and GND pins. This dual-stage approach handles high RMS ripple current while suppressing high-frequency noise. The ceramic capacitor must be located within 2mm of the IC to minimize parasitic inductance and ensure stable switching edge integrity.
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:
- 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+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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