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Analog Devices Inc./Maxim Integrated MAX5035DUSA+
- Part No.:
- MAX5035DUSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5035DUSA+.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:494
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Product details
Overview
MAX5035DUSA+ from Maxim Integrated is a high-voltage, adjustable-output step-down DC-DC converter with 7.5V–76V input range, 1.25V–13.2V output adjustability, 1A output current capability, and internal 0.4Ω high-side DMOS FET. It delivers up to 94% efficiency at 24VIN/0.5A/12VOUT, operates over –40°C to +125°C, and targets automotive power conversion in battery-supplied systems.
For engineers reviewing the MAX5035DUSA+ datasheet, MAX5035DUSA+ pinout, MAX5035DUSA+ application, or MAX5035DUSA+ equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade thermal behavior, and real-world design implications for high-input-voltage buck regulation.
Technical Context
The MAX5035DUSA+ uses voltage-mode PWM control with feed-forward compensation and fixed 125kHz switching frequency (109–137kHz over temp), automatically transitioning to pulse-skipping mode below ~85mA load to maintain 270µA no-load quiescent current. Its integrated high-side DMOS switch eliminates external MOSFET requirements while enabling operation up to 76V input.
It features internal frequency compensation, undervoltage lockout (5.2V typ), hiccup-mode short-circuit protection, thermal shutdown at +160°C (20°C hysteresis), and a dedicated VD regulator (7.8V typ) for bootstrap gate drive. The FB pin regulates at 1.221V (1.192–1.250V) for precise output setting via external resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports wide automotive battery transients including cold-crank (≥6V) and load-dump (≤80V absolute max). |
| Output Voltage Range | 1.25V to 13.2V - adjustable via external resistive divider; FB reference = 1.221V ±0.029V ensures ±1.2% output accuracy at full load. |
| Max Output Current | 1A - limited by package thermal resistance (SO: 170°C/W); derates above +70°C ambient per 5.9mW/°C. |
| Quiescent Current | 270µA (typ) at no load - enables always-on subsystems in automotive ECUs without excessive battery drain. |
| Switching Frequency | 125kHz (109–137kHz) - balances EMI control, inductor size, and efficiency; fixed-frequency simplifies EMI filter design. |
| Internal High-Side FET RDS(ON) | 0.4Ω (typ) - reduces conduction loss and eliminates external high-voltage MOSFET, lowering BOM count and layout complexity. |
| Thermal Shutdown | +160°C junction temperature with +140°C restart hysteresis - protects against sustained overload or poor heatsinking in enclosed automotive modules. |
Pinout & Package
MAX5035DUSA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead(Pb)-free (+ suffix), rated for –40°C to +125°C operation. Thermal resistance θJA = 170°C/W (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; critical for proper startup and continuous conduction. |
| VD | Internal regulator output | Provides ~7.8V regulated supply for gate driver; must be bypassed to GND with 0.1µF ceramic capacitor to stabilize bootstrap charging. |
| SGND | Signal ground reference | Internal analog ground node; must be connected directly to system GND plane-separate from power ground traces to minimize noise coupling. |
| FB | Feedback input | Senses output voltage via external resistor divider; regulates to 1.221V; bias current <±150nA minimizes divider error in precision applications. |
| ON/OFF | Shutdown control input | Logic-level enable: <1.5V = shutdown (10µA ISHDN), >1.69V = active; 100mV hysteresis prevents chatter during slow-rising VIN or UVLO transitions. |
| GND | Power ground return | Main return path for switch current and output capacitor; must connect to low-impedance star ground point near LX and rectifier anode. |
| VIN | Main input supply | Accepts 7.5V–76V; requires local low-ESR input capacitor (e.g., 68µF aluminum + 0.1µF ceramic) placed adjacent to pin to suppress high di/dt ripple. |
| LX | Switch node | Drain of internal high-side DMOS; connects to inductor and Schottky rectifier cathode; high dv/dt node requiring tight layout and minimal trace area. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-voltage DMOS switch | 0.4Ω RDS(ON) enables single-chip 76V buck conversion without external MOSFET, reducing solution size and gate-drive complexity. |
| Automotive temperature grade | –40°C to +125°C operation with guaranteed performance and thermal shutdown at +160°C ensures reliability in engine bay and under-hood environments. |
| Pulse-skipping light-load mode | Reduces IQ to 270µA at no load while maintaining regulation-critical for always-on telematics, ADAS sensors, and infotainment standby circuits. |
| Internal frequency compensation | Eliminates external compensation network; allows stable operation with standard LC output filters and simplifies design validation across input/output conditions. |
| Hiccup-mode short-circuit protection | Disables switching during output short, then retries after cooldown-prevents thermal runaway and enables safe recovery without manual reset. |
| Adjustable output via FB pin | 1.221V feedback reference with ±0.029V tolerance supports accurate 1.25V–13.2V outputs using standard 1% resistors, suitable for diverse MCU core and peripheral rail needs. |
Applications
| Automotive Body Control Module (BCM) | Industrial 24V/48V Distributed Power |
|---|---|
Use Scenario: Powering microcontrollers, CAN transceivers, and sensor interfaces in door modules, seat controllers, and lighting nodes supplied from vehicle battery (9–16V nominal, up to 76V during load dump). IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting raw battery voltage to stable 3.3V or 5V logic rails. Use Value: Withstands automotive transients without external TVS, maintains 270µA quiescent current for low-power sleep modes, and delivers 1A peak for actuator drivers. |
Use Scenario: Converting 24V or 48V factory bus voltage to 5V/12V for PLC I/O modules, motor drives, and HMI displays operating in harsh industrial environments. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter providing isolated downstream DC-DC stages with robust thermal management. Use Value: 94% peak efficiency at 24VIN/12VOUT reduces heat buildup in sealed enclosures; SO package supports automated assembly and reflow compatibility. |
| Railway Onboard Electronics | Commercial Telematics Unit |
Use Scenario: Powering communication processors and GPS receivers in train control systems where input ranges from 72V DC (nominal) to 120V during regeneration braking. IC Role / Device Role / Timing Role: Input-stage buck converter accepting wide-range traction power and delivering clean 5V for safety-critical computing. Use Value: 76V absolute max rating and –40°C to +125°C operation meet EN 50155 requirements; hiccup-mode protection avoids latch-up during cable fault events. |
Use Scenario: Supplying LTE modem, GNSS receiver, and flash memory in fleet-tracking devices mounted in vehicle cabins with variable battery voltage and thermal exposure. IC Role / Device Role / Timing Role: Main power IC regulating 12V vehicle supply to 3.3V for cellular baseband and 5V for USB peripherals. Use Value: Adjustable output supports multiple rail configurations; 10µA shutdown current extends battery backup runtime during ignition-off periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDDARQ1 | 4.5V–65V input, 1A, 100kHz–1MHz adjustable frequency, requires external MOSFETs and compensation. | Higher frequency flexibility but larger solution size; lacks integrated VD regulator and internal compensation. | Choose LM5164QDDARQ1 when programmable frequency or higher VIN margin beyond 65V is unnecessary and external FET control is preferred. |
| TPS54160AQPWPRQ1 | 3.5V–60V input, 1.5A, 100kHz–2.5MHz sync capability, integrated compensation, but no internal VD regulator. | Higher current rating but narrower input range; requires external bootstrap circuitry for high-side gate drive. | Choose TPS54160AQPWPRQ1 for designs needing >1A output or tighter EMI control via synchronization, accepting added external components. |
Compared with MAX5035DUSA+, LM5164QDDARQ1 offers frequency agility at the cost of increased layout complexity and missing integrated gate drive, while TPS54160AQPWPRQ1 trades input voltage headroom for higher current and sync capability-neither matches the MAX5035DUSA+'s combination of 76V rating, internal VD, and fully compensated 8-pin SO simplicity.
Availability
MAX5035DUSA+ is available at Aetrix Electronics and suitable for automotive body electronics, industrial distributed power supplies, and railway onboard systems requiring stable component supply across extended temperature and high-voltage stress conditions.
Supply support for MAX5035DUSA+ 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 series is part of Maxim's MAXPower™ high-voltage DC-DC converter family, engineered specifically for automotive and industrial systems requiring reliable, compact, and transient-hardened buck regulation from unregulated battery or bus supplies.
FAQ
What is the maximum input voltage the MAX5035DUSA+ can withstand?
The MAX5035DUSA+ has an absolute maximum input voltage rating of +80V, with recommended continuous operation up to +76V. It is designed to survive automotive load-dump transients and remains functional across its full –40°C to +125°C temperature range at these voltages. Exceeding +80V risks permanent damage per the Absolute Maximum Ratings table.
How do I set the output voltage for the MAX5035DUSA+?
The MAX5035DUSA+ uses the FB pin to regulate output voltage via an external resistor divider. With a feedback reference of 1.221V, set VOUT = 1.221 × (1 + R1/R2). For example, R1 = 41.2kΩ and R2 = 13.3kΩ yields 5.0V. Keep R2 ≤15kΩ to limit bias current error, and use 1% tolerance resistors for ±1.2% output accuracy.
Does the MAX5035DUSA+ require external compensation components?
No, the MAX5035DUSA+ includes internal frequency compensation optimized for stability with standard LC output filters. No external compensation network is needed-this simplifies design, reduces BOM count, and ensures consistent loop response across input/output conditions without tuning.
What protection features does the MAX5035DUSA+ include?
The MAX5035DUSA+ integrates undervoltage lockout (5.2V typ), cycle-by-cycle current limiting, hiccup-mode short-circuit protection, thermal shutdown at +160°C (with +140°C restart hysteresis), and 10µA shutdown current. These features ensure robust operation during faults without external supervision circuitry.
Can the MAX5035DUSA+ operate in pulse-skipping mode, and how does it affect efficiency?
Yes, the MAX5035DUSA+ automatically enters pulse-skipping mode below ~85mA load to reduce switching losses. This lowers quiescent current to 270µA (typ) at no load and maintains >80% efficiency down to 1mA output, making it ideal for always-on automotive subsystems where standby power is critical.
MAX5035DUSA+ 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7.5V
- Voltage - Input (Max):
- 76V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 13.2V
- 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
MAX5035DUSA+ FAQ
1.How can I place an order for MAX5035DUSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035DUSA+ 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 MAX5035DUSA+ reliable?
The price and inventory of MAX5035DUSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035DUSA+ is usually 5 days.
3.What payment methods are accepted for MAX5035DUSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035DUSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035DUSA+?
MAX5035DUSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035DUSA+ 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 MAX5035DUSA+?
For technical support, including MAX5035DUSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035DUSA+ requirements.
6.How does Aetrix verify that MAX5035DUSA+ is sourced from the original manufacturer or authorized distributors?
All MAX5035DUSA+ 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 MAX5035DUSA+ meets industry standards.
7.What is the process for return or replacement of MAX5035DUSA+?
All MAX5035DUSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035DUSA+, 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 MAX5035DUSA+ part is unused and in its original packaging.
Return procedure for MAX5035DUSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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