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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:1,884
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Product details
Overview
MAX5035DUSA from Maxim Integrated is a high-voltage, adjustable-output step-down DC-DC converter operating from 7.5V to 76V input, delivering up to 1A output current with 90% efficiency at 12VIN/5VOUT, 270µA no-load quiescent current, and fixed 125kHz PWM switching. It integrates a 0.4Ω high-side DMOS FET and internal frequency compensation for automotive power rail conversion.
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 (-40°C to +125°C) operation, and real-world design meaning for high-input-voltage buck regulation in constrained space.
Technical Context
The MAX5035DUSA implements voltage-mode control with feed-forward compensation and automatic pulse-skipping mode at light loads to maintain high efficiency across wide input ranges. Its internal 7.8V regulator (VD) powers gate drive and analog circuitry, while BST pin enables bootstrap-based high-side N-MOSFET drive using a 0.1µF ceramic capacitor.
It features cycle-by-cycle current limiting (1.9A typical peak switch limit), hiccup-mode short-circuit protection, thermal shutdown at +160°C with +20°C hysteresis, and undervoltage lockout triggered internally at 5.2V or externally via ON/OFF resistive divider. Feedback regulation targets 1.221V at FB pin for adjustable output configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports direct connection to 24V/48V industrial buses and 12V–72V automotive battery rails without pre-regulation. |
| Output Voltage Range | 1.25V to 13.2V - set via external resistor divider on FB pin; enables flexible system-level voltage scaling including 5V, 9V, or 12V outputs. |
| Max Output Current | 1A - limited by package thermal dissipation (471mW @ +70°C in SO-8); requires proper PCB copper area for heatsinking. |
| Switching Frequency | 125kHz (109–137kHz range) - fixed-frequency PWM ensures predictable EMI profile and simplifies filter design vs. variable-frequency PFM-only converters. |
| Quiescent Current | 270µA at no load - enables always-on subsystems (e.g., CAN wake-up receivers) in automotive applications without excessive battery drain. |
| Shutdown Current | 10µA typical - allows deep-sleep modes in remote sensors or telematics units where standby power must be minimized. |
| Feedback Reference | 1.221V ±0.029V - tight tolerance enables ±1.5% output accuracy over temperature and line when using 1% resistors. |
Pinout & Package
MAX5035DUSA is housed in an 8-pin SO (Small Outline) package rated for -40°C to +125°C operation and RoHS-compliant (+ suffix). The package uses JEDEC-standard SOIC-8 footprint with 1.27mm pitch and exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor connection | Connects 0.1µF ceramic capacitor between BST and LX to generate gate drive voltage for internal high-side DMOS FET. |
| VD | Internal regulator output | Provides ~7.8V regulated supply for internal logic and gate driver; bypassed to GND with 0.1µF ceramic capacitor. |
| SGND | Signal ground reference | Internal analog ground node; must be tied directly to system GND plane to avoid feedback loop instability. |
| FB | Feedback input | Senses output voltage via external resistor divider; regulates VOUT to 1.221V reference - determines adjustable output value. |
| ON/OFF | Enable/shutdown control | Logic-level input: <1.53V = shutdown (10µA ISHDN), >1.85V = active; includes 100mV hysteresis for noise immunity. |
| GND | Power ground return | Main power return path for VIN, LX, and VD currents; must connect to low-impedance ground plane near input/output capacitors. |
| VIN | Main input supply | Accepts 7.5V–76V unregulated input; requires local low-ESR bypass capacitor (e.g., 68µF aluminum + 0.1µF ceramic). |
| LX | Switch node | Drains high-side DMOS source; connects to external Schottky diode cathode and inductor; 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 - eliminates need for external high-voltage MOSFET and driver IC. |
| Internal frequency compensation | Enables stable closed-loop operation with standard LC output filter; removes requirement for external compensation network. |
| Pulse-skipping mode at light loads | Maintains >80% efficiency down to 1mA load - critical for battery-backed systems where standby current dominates lifetime energy use. |
| Automotive temperature grade (-40°C to +125°C) | Qualified per AEC-Q100 stress test requirements; supports under-hood and chassis-mounted power conversion without derating. |
| Hiccup-mode short-circuit protection | Shuts down during sustained overload, cools, then retries - prevents thermal runaway and enables self-recovery after fault clearance. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power Supply |
|---|---|
|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interface circuits from a 12V–48V vehicle battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary buck regulator providing clean, regulated 5V rail with fast transient response to handle load steps from solenoid actuation. Use Value: 270µA quiescent current extends battery life during vehicle sleep mode; 76V max input withstands load-dump transients up to ISO 7637-2 Pulse 5a. |
Use Scenario: Generating isolated 5V or 12V auxiliary power for digital I/O modules in programmable logic controllers operating on 24V DC field bus. IC Role / Device Role / Timing Role: Non-isolated step-down converter supplying logic-level power to FPGA, level shifters, and optocoupler drivers. Use Value: Fixed 125kHz switching enables predictable EMI filtering; 1A output supports multiple parallel I/O channels without external current sharing. |
| Railway Signaling Power Converter | Telecom Remote Radio Unit (RRU) |
|
Use Scenario: Converting 72V nominal railway traction battery to 5V/3.3V for onboard monitoring and communication electronics. IC Role / Device Role / Timing Role: High-input-voltage primary regulator enabling single-stage conversion instead of cascaded 72V→24V→5V architecture. Use Value: 90% efficiency at full load reduces thermal load in sealed enclosures; -40°C to +125°C rating meets EN 50124-1 environmental requirements. |
Use Scenario: Providing bias power to RF front-end components (PA bias, LNA, PLL) in outdoor macrocell RRUs powered from -48V telecom rectifier. IC Role / Device Role / Timing Role: Intermediate buck stage stepping -48V to +12V or +5V for downstream point-of-load regulators. Use Value: 76V absolute max input accommodates reverse-polarity protection diode drop and line surges; internal VD rail powers gate drivers reliably. |
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 |
|---|---|---|---|
| LM5017MH/NOPB | 4.5V–75V input, 600mA output, 1MHz switching, no integrated VD rail | Lower output current; requires external bias supply for gate drive; better for compact layouts needing higher frequency | Select LM5017MH/NOPB when board space is constrained and 600mA suffices; avoid if VD-dependent external circuitry exists. |
| LT8609SDE#TRPBF | 3.0V–42V input, 2A output, 200kHz–3MHz sync capability, integrated MOSFETs | Narrower input range excludes 48V+ industrial use; higher current but lower max input voltage than MAX5035DUSA | Choose LT8609SDE#TRPBF for 24V systems requiring >1A or ultra-low EMI with spread-spectrum mode; not suitable for 72V rail applications. |
Compared with LM5017MH/NOPB and LT8609SDE#TRPBF, MAX5035DUSA uniquely supports 76V input with integrated VD bias rail and automotive temperature range in SO-8 - making it optimal for legacy 48V/72V infrastructure upgrades where reliability and input surge margin are critical.
Availability
MAX5035DUSA is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC power supplies, railway signaling systems, and telecom remote radio units requiring stable component supply across extended temperature and high-input-voltage 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 belongs to Maxim's MAXPower™ high-voltage DC-DC converter family, engineered specifically for robust, efficient step-down regulation in harsh environments where wide input range and automotive qualification are mandatory.
FAQ
What is the maximum input voltage supported by the MAX5035DUSA?
The MAX5035DUSA supports an absolute maximum input voltage of +80V, with continuous operation specified from 7.5V to 76V. This allows direct connection to 48V and 72V industrial and automotive battery systems, including tolerance for ISO 7637-2 load-dump transients. Operation above 76V is not recommended for long-term reliability.
How do I configure the output voltage for the MAX5035DUSA?
The MAX5035DUSA has an adjustable output voltage set via a resistor divider from VOUT to GND, with the midpoint connected to the FB pin. Using the formula R3 = R4 × (VOUT − 1.22)/1.22 and selecting R4 ≤ 15kΩ, you can achieve any output from 1.25V to 13.2V. For example, 5V output uses R3 = 41.2kΩ and R4 = 13.3kΩ.
Does the MAX5035DUSA require external compensation components?
No, the MAX5035DUSA includes fully internal frequency compensation optimized for stability with standard LC output filters. No external compensation network is needed - simplifying layout and reducing bill-of-materials cost. However, output capacitance ESR must remain within 100mΩ–250mΩ to maintain phase margin.
What thermal protection features does the MAX5035DUSA include?
The MAX5035DUSA 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 (1.9A typical peak) and undervoltage lockout to prevent operation below 5.2V. These features protect both the IC and external components during fault conditions.
Can the MAX5035DUSA be used in automotive applications?
Yes, the MAX5035DUSA is qualified for automotive temperature range (-40°C to +125°C) and offered in /V+ (lead-free, RoHS-compliant) variants. Its 76V input rating, 270µA quiescent current, and built-in protection features meet key requirements for body control, infotainment, and ADAS power supplies in modern vehicles.
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:
- Obsolete
- 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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