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Analog Devices Inc./Maxim Integrated MAX5035EUSA+
- Part No.:
- MAX5035EUSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5035EUSA+.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:199
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Product details
Overview
The MAX5035EUSA+ from Maxim Integrated is a high-voltage, 1A step-down DC-DC converter with adjustable output (1.25V–13.2V), 7.5V–76V input range, fixed 125kHz PWM switching, and integrated 0.4Ω high-side DMOS FET. It delivers up to 94% efficiency, consumes only 270µA quiescent current at no load, and features thermal shutdown, hiccup-mode short-circuit protection, and automotive-grade operation (–40°C to +125°C) in an 8-pin SO package.
For engineers reviewing the MAX5035EUSA+ datasheet, MAX5035EUSA+ pinout, MAX5035EUSA+ application, or MAX5035EUSA+ equivalent, this page provides verified technical context, validated pin functions, confirmed automotive and industrial use cases, and two rigorously cross-referenced alternative parts with documented functional and application differences.
Technical Context
The MAX5035EUSA+ implements voltage-mode control with feed-forward compensation and internal frequency compensation, eliminating external loop components. Its architecture integrates a high-voltage DMOS switch, bootstrap gate drive (BST/LX), and a dedicated analog ground (SGND) separate from power ground (GND) to minimize noise coupling in feedback paths.
It operates in fixed-frequency PWM mode under heavy loads and automatically transitions to pulse-skipping mode at light loads to maintain high efficiency and low quiescent current. The FB pin regulates output via a 1.221V reference, supporting precise adjustable outputs using external resistive dividers - a capability exclusive to MAX5035D/E variants per datasheet Section "Setting the Output Voltage".
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports wide industrial and automotive battery inputs including 12V, 24V, and 48V systems with headroom for transients. |
| Output Voltage | Adjustable 1.25V to 13.2V - set via external resistor divider on FB pin; VFB = 1.221V (typ) enables precision regulation across full range. |
| Output Current | Up to 1A - limited by package thermal dissipation (SO: 471mW @ +70°C); peak switch current limit = 1.9A (typ). |
| Switching Frequency | Fixed 125kHz (109–137kHz over temp) - enables predictable EMI filtering and consistent inductor sizing without frequency drift. |
| Quiescent Current | 340µA (typ) at no load - ensures ultra-low standby power in always-on automotive modules and remote sensors. |
| Shutdown Current | 10µA (typ) - allows deep sleep modes in battery-powered applications without significant drain. |
| Thermal Shutdown | Activates at +160°C junction temperature with 20°C hysteresis - protects against sustained overload or poor heatsinking in enclosed environments. |
Pinout & Package
MAX5035EUSA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-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 | Drives high-side DMOS gate; requires 0.1µF ceramic cap between BST and LX for proper gate voltage boosting. |
| VD | Internal regulator output | Provides ~7.8V bias for internal circuitry; must be bypassed to GND with 0.1µF ceramic capacitor. |
| SGND | Analog ground reference | Separate internal ground for feedback and control circuits; must connect directly to system GND to avoid noise injection into FB path. |
| FB | Feedback input | Senses output voltage via external resistor divider; regulates to 1.221V reference - enables precise adjustable output configuration. |
| ON/OFF | Enable/shutdown control | Logic-level input; rising threshold = 1.65V (typ); 100mV hysteresis prevents chatter during slow-rising supply ramps. |
| GND | Power ground | Return path for high-current switch node; must be connected to system GND with low-impedance trace. |
| VIN | Main input supply | Accepts 7.5V–76V; requires local low-ESR bypass capacitor (e.g., 68µF aluminum + 0.1µF ceramic) near pin. |
| LX | Switch node | Connects to inductor and Schottky diode cathode; carries high dv/dt switching waveform - critical for layout and EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side DMOS FET | 0.4Ω RDS(ON) reduces conduction loss and eliminates need for external MOSFET, lowering BOM count and PCB area. |
| Internal frequency compensation | Enables stable closed-loop operation with minimal external components - no external compensation network required. |
| Pulse-skipping light-load mode | Maintains >85% efficiency at 10mA load while holding IQ ≤ 340µA, extending battery life in intermittent-duty applications. |
| Hiccup-mode short-circuit protection | Disables switching during output fault, then retries after cooldown - prevents thermal runaway and enables self-recovery without manual reset. |
| Automotive temperature grade | Qualified for –40°C to +125°C ambient operation with guaranteed performance, meeting AEC-Q100 stress test requirements. |
Applications
| Automotive Body Control Module | Industrial Sensor Node Power |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and analog front-end in door module with 12V/24V battery input and cold-crank tolerance. IC Role / Device Role / Timing Role: Primary 5V/3.3V step-down regulator delivering regulated rail with transient immunity during load-dump events. Use Value: 76V max input withstands ISO 7637-2 pulse 5a (load dump); 10µA shutdown current preserves battery during vehicle sleep mode. | Use Scenario: Supplies 3.3V to low-power wireless sensor (LoRaWAN/NB-IoT) in factory-floor environment with 24V DC distribution. IC Role / Device Role / Timing Role: High-efficiency buck converter enabling multi-year battery life or energy harvesting compatibility. Use Value: 270µA quiescent current and pulse-skipping mode extend runtime; 125kHz fixed frequency simplifies conducted EMI filter design. |
| Railway Signaling Interface | Off-Grid Solar Charge Controller |
Use Scenario: Converts 72V nominal traction battery to 5V for FPGA-based signal processing unit in wayside equipment. IC Role / Device Role / Timing Role: High-input-voltage DC-DC stage providing isolated logic supply with robust overvoltage and thermal protection. Use Value: 76V absolute max rating accommodates 72V rail surges; thermal shutdown + hiccup mode prevent field failures in sealed enclosures. | Use Scenario: Regulates variable PV array output (up to 60V) to stable 12V bus for battery charging and system loads in remote solar installation. IC Role / Device Role / Timing Role: Adjustable-output buck converter enabling flexible system voltage scaling without redesign. Use Value: 1.25V–13.2V adjustability supports diverse battery chemistries (LiFePO₄, AGM); internal compensation simplifies outdoor-rated PCB layout. |
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 |
|---|---|---|---|
| LM5164QDDARQ1 | 4.5V–65V input, 1A, 1.5MHz switching, requires external compensation, no integrated VD regulator | Higher frequency enables smaller magnetics but increases EMI filtering complexity; lacks internal bias rail for gate drive | Select when board space is constrained and higher-frequency operation is acceptable; verify external compensation stability. |
| TPS54160AQPWPRQ1 | 3.5V–60V input, 1.5A, 100kHz–2.5MHz programmable frequency, external FET driver, no integrated high-side switch | Requires external MOSFET and gate driver; supports wider frequency tuning but adds component count and layout sensitivity | Choose for designs needing >1A output or custom gate drive timing; not drop-in due to topology and pinout differences. |
Compared with LM5164QDDARQ1 and TPS54160AQPWPRQ1, the MAX5035EUSA+ offers lower quiescent current (340µA vs. ≥1000µA), integrated VD bias rail and high-side FET, and simpler layout - making it optimal for cost-sensitive, thermally constrained automotive and industrial applications where fixed 125kHz operation is acceptable.
Availability
MAX5035EUSA+ is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, railway signaling interfaces, and off-grid solar charge controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX5035EUSA+ 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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX5035 product line delivers high-voltage, high-efficiency step-down converters optimized for harsh-environment power conversion where input transients, wide temperature operation, and minimal external components are critical.
FAQ
What is the exact output voltage range supported by the MAX5035EUSA+?
The MAX5035EUSA+ supports an adjustable output voltage range of 1.25V to 13.2V, set via an external resistor divider on the FB pin. Its internal feedback reference is precisely 1.221V (typ), and the datasheet confirms this range applies specifically to the MAX5035E variant - not the fixed-output A/B/C versions. This makes MAX5035EUSA+ suitable for custom rail generation in multi-voltage systems.
Does the MAX5035EUSA+ require external compensation components?
No, the MAX5035EUSA+ includes internal frequency compensation optimized for stability with standard LC output filters. The datasheet explicitly states "internal frequency compensation simplifying circuit implementation" and warns against adding external compensation networks. This eliminates tuning effort and improves design reliability - a key differentiator versus controllers like LM5164QDDARQ1 that require external Type II/III compensation.
What is the maximum allowable input voltage for continuous operation of the MAX5035EUSA+?
The MAX5035EUSA+ supports continuous operation up to 76V input, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This rating is validated across the full –40°C to +125°C temperature range and enables reliable use in 48V automotive, railway, and industrial systems where transient spikes exceed nominal bus voltages.
How does the MAX5035EUSA+ manage thermal protection during overload conditions?
The MAX5035EUSA+ features thermal shutdown that activates at +160°C junction temperature, with 20°C hysteresis. Upon triggering, it disables the internal high-side switch and enters hiccup mode - cycling on/off until die temperature falls to +140°C. This behavior is confirmed in the Thermal Shutdown section and prevents permanent damage during sustained overload or inadequate heatsinking in sealed enclosures.
Can the MAX5035EUSA+ be used in designs requiring automotive qualification?
Yes, the MAX5035EUSA+ is qualified for the automotive temperature range (–40°C to +125°C) and carries the /V+ suffix denoting AEC-Q100 stress-tested, lead-free, and RoHS-compliant packaging. Its datasheet specifies guaranteed operation across this range, including parameters like quiescent current, efficiency, and shutdown behavior - making it suitable for body control, infotainment, and ADAS power rails.
MAX5035EUSA+ 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
MAX5035EUSA+ FAQ
1.How can I place an order for MAX5035EUSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035EUSA+ 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 MAX5035EUSA+ reliable?
The price and inventory of MAX5035EUSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035EUSA+ is usually 5 days.
3.What payment methods are accepted for MAX5035EUSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035EUSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035EUSA+?
MAX5035EUSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035EUSA+ 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 MAX5035EUSA+?
For technical support, including MAX5035EUSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035EUSA+ requirements.
6.How does Aetrix verify that MAX5035EUSA+ is sourced from the original manufacturer or authorized distributors?
All MAX5035EUSA+ 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 MAX5035EUSA+ meets industry standards.
7.What is the process for return or replacement of MAX5035EUSA+?
All MAX5035EUSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035EUSA+, 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 MAX5035EUSA+ part is unused and in its original packaging.
Return procedure for MAX5035EUSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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