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Analog Devices Inc./Maxim Integrated MAX5035BUSA+
- Part No.:
- MAX5035BUSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5035BUSA+.pdf
- Description:
- IC REG BUCK 5V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,286
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Product details
Overview
The MAX5035BUSA+ from Maxim Integrated is a high-voltage, 1A step-down DC-DC converter with fixed 5.0V output, operating from 7.5V to 76V input and delivering up to 90% efficiency at 12VIN/0.5AOUT. 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-ideal for automotive power rails and industrial distributed supplies.
For engineers reviewing the MAX5035BUSA+ datasheet, MAX5035BUSA+ pinout, MAX5035BUSA+ application, or MAX5035BUSA+ equivalent, key selection criteria include its 5.0V ±2.5% output tolerance over 20mA–1A load, 270µA no-load quiescent current, automotive-grade SO-8 package (–40°C to +125°C), and integrated thermal shutdown/short-circuit protection.
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-frequency PWM operation transitions seamlessly into pulse-skipping mode below ~85mA load to reduce IQ without compromising stability.
The device implements undervoltage lockout (UVLO = 5.2V typ), cycle-by-cycle current limiting (ILIM = 1.9A typ), hiccup-mode short-circuit protection, and thermal shutdown at +160°C with +20°C hysteresis-enabling robust operation in harsh environments without external supervision circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports wide-range industrial and automotive battery inputs including 24V/48V systems and unregulated rail dropouts. |
| Output Voltage | 5.0V ±2.5% (4.85V–5.15V) - tightly regulated fixed output suitable for powering microcontrollers, sensors, and logic interfaces. |
| Max Output Current | 1A continuous - limited by package thermal resistance (SO-8: θJA = 170°C/W); 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 - enables long-term battery operation in always-on systems such as telematics or remote sensors. |
| Shutdown Current | 10µA typ - ensures minimal standby drain when disabled via ON/OFF pin, critical for low-power wake-up architectures. |
| Internal High-Side RDS(ON) | 0.4Ω max - minimizes conduction loss and eliminates need for external MOSFET, reducing BOM count and layout complexity. |
Pinout & Package
MAX5035BUSA+ is housed in an 8-pin SO (Small Outline) package compliant with JEDEC MS-012, rated for –40°C to +125°C operation and RoHS-compliant (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BST | Bootstrap capacitor connection | Connects 0.1µF ceramic cap between BST and LX to generate gate drive voltage for internal high-side DMOS switch. |
| 2 - VD | Internal regulator output | Provides ~7.8V regulated supply for gate driver; bypassed to GND with 0.1µF ceramic capacitor for stability. |
| 3 - SGND | Signal ground reference | Internal analog ground node; must be connected directly to system GND plane to avoid noise coupling into feedback path. |
| 4 - FB | Feedback sense input | Connected directly to VOUT for fixed 5V versions; senses 1.22V reference to regulate output voltage precisely. |
| 5 - ON/OFF | Enable/shutdown control | Logic-level input: <1.5V disables device (10µA ISHDN); >1.69V (typ) enables operation with 100mV hysteresis. |
| 6 - GND | Power ground return | Main power return path for LX switch and internal regulator; requires low-impedance star-ground connection near IC. |
| 7 - VIN | Main input supply | Accepts 7.5V–76V; requires local low-ESR bulk capacitor (e.g., 68µF) placed adjacent to pin to suppress ripple and EMI. |
| 8 - LX | Switch node | Drains internal high-side DMOS; connects to external inductor and Schottky freewheeling diode (e.g., 50SQ100). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-voltage DMOS switch | Eliminates external MOSFET, simplifies design, and ensures optimal gate-drive timing for 76V operation. |
| Internal frequency compensation | Enables stable loop response with only two external components (inductor + output cap), reducing design iteration time. |
| Pulse-skipping light-load mode | Maintains >85% efficiency down to 10mA load while holding IQ at 270µA-critical for intermittent-duty applications. |
| Hiccup-mode short-circuit protection | Automatically cycles on/off during sustained overload, preventing thermal runaway and enabling self-recovery without reset. |
| Thermal shutdown with hysteresis | Shuts down at +160°C junction temperature and resumes at +140°C, providing safe fault handling without external thermal sensors. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interface circuits from a 12V/24V vehicle battery with cold-crank dips to 6V. IC Role / Device Role / Timing Role: Primary 5V point-of-load regulator delivering clean, regulated supply with UVLO threshold set to 7.5V to prevent brownout during cranking. Use Value: Maintains regulation down to 7.5V input and survives 76V load-dump transients-no external TVS required for ISO 7637-2 compliance. |
Use Scenario: Providing isolated 5V rail for digital I/O modules in programmable logic controllers operating from 24V DC field wiring. IC Role / Device Role / Timing Role: High-efficiency buck converter supplying 1A to multiple optocouplers and level-shifters with minimal heat buildup in confined DIN-rail enclosures. Use Value: 90% peak efficiency and 170°C/W θJA enable full 1A output at +70°C ambient without heatsinking-reducing system size and cost. |
| Railway Signaling Power Supply | Smart Grid Remote Terminal Unit |
|
Use Scenario: Converting 72V nominal railway battery (range: 45–100V) to stable 5V for safety-critical signaling logic and watchdog timers. IC Role / Device Role / Timing Role: Input-wide buck regulator with thermal shutdown and hiccup protection ensuring fail-safe behavior during prolonged overloads or short circuits. Use Value: 160°C thermal shutdown and automatic recovery allow continued operation after transient faults-meeting EN 5012x reliability requirements. |
Use Scenario: Powering ARM-based RTU processors, RF modems, and metering ICs in outdoor substations exposed to wide temperature swings and lightning-induced surges. IC Role / Device Role / Timing Role: Robust 5V POL regulator with 270µA quiescent current supporting battery-backed sleep modes and fast wake-up response. Use Value: 10µA shutdown current extends backup battery life beyond 5 years in maintenance-free deployments-validated per IEC 61000-4-5 surge immunity. |
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, 0.5A output, no integrated compensation, requires external soft-start. | Limited to lower current; lacks hiccup-mode protection and thermal hysteresis-requires additional fault management circuitry. | Choose LM5008AMM/NOPB only if input exceeds 76V or board space allows extra passive components for loop compensation. |
| TPS54360DGQR | Adjustable output (1.22V–60V), 60V max input, 3.5A output, integrated compensation, 100µA IQ. | Higher current capability but narrower input range; no automotive temp grade in standard version-requires external UVLO for 76V operation. | Prefer TPS54360DGQR when adjustable output or >1A load is needed, but verify thermal performance at 76V input and add external UVLO network. |
Compared with LM5008AMM/NOPB and TPS54360DGQR, the MAX5035BUSA+ delivers guaranteed 1A output at 76V input with built-in thermal hysteresis, hiccup protection, and automotive-grade SO-8 packaging-reducing validation effort and bill-of-materials count for ruggedized 5V POL designs.
Availability
MAX5035BUSA+ is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, railway signaling systems, and smart grid remote terminal units requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX5035BUSA+ 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-voltage, high-efficiency step-down converters targeting applications where wide-input-range DC-DC conversion, low quiescent current, and integrated protection are essential-such as automotive subsystems and industrial edge nodes.
FAQ
What is the maximum input voltage rating for the MAX5035BUSA+?
The MAX5035BUSA+ has an absolute maximum input voltage rating of +80V, with operational specification from 7.5V to 76V. This allows reliable use in 24V/48V industrial systems and automotive applications subject to load-dump transients up to 76V, as defined in ISO 7637-2. Exceeding 80V risks permanent damage.
Does the MAX5035BUSA+ require external compensation components?
No, the MAX5035BUSA+ features fully internal frequency compensation optimized for stability with standard external LC filters. The datasheet confirms no external compensation network is needed-only the recommended 100µH inductor and 68µF output capacitor are required for basic operation, significantly simplifying layout and qualification.
How does the MAX5035BUSA+ handle short-circuit conditions?
The MAX5035BUSA+ employs hiccup-mode short-circuit protection: upon detecting overcurrent, it shuts down the switch, waits a fixed interval, then attempts restart. If the fault persists, it repeats the cycle-limiting average power dissipation and preventing thermal runaway. This behavior is confirmed in the "Detailed Description" and "Thermal-Overload Protection" sections of the datasheet.
Can the MAX5035BUSA+ operate at full 1A output across its entire temperature range?
At +125°C ambient, the MAX5035BUSA+ SO-8 package's thermal resistance (θJA = 170°C/W) limits continuous 1A output due to junction temperature rise. Derating curves in the datasheet show usable output current drops to ~0.6A at +125°C. For full 1A operation across –40°C to +125°C, PCB copper area and airflow must be optimized per JEDEC 51 guidelines.
What is the purpose of the VD pin on the MAX5035BUSA+?
The VD pin on the MAX5035BUSA+ provides a regulated ~7.8V output used internally to drive the high-side DMOS gate and power analog circuitry. It must be bypassed to GND with a 0.1µF ceramic capacitor to stabilize the internal regulator and ensure consistent gate drive under varying load and input conditions-failure to do so causes erratic switching or startup failure.
MAX5035BUSA+ 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:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX5035BUSA+ FAQ
1.How can I place an order for MAX5035BUSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035BUSA+ 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 MAX5035BUSA+ reliable?
The price and inventory of MAX5035BUSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035BUSA+ is usually 5 days.
3.What payment methods are accepted for MAX5035BUSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035BUSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035BUSA+?
MAX5035BUSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035BUSA+ 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 MAX5035BUSA+?
For technical support, including MAX5035BUSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035BUSA+ requirements.
6.How does Aetrix verify that MAX5035BUSA+ is sourced from the original manufacturer or authorized distributors?
All MAX5035BUSA+ 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 MAX5035BUSA+ meets industry standards.
7.What is the process for return or replacement of MAX5035BUSA+?
All MAX5035BUSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035BUSA+, 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 MAX5035BUSA+ part is unused and in its original packaging.
Return procedure for MAX5035BUSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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