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Analog Devices Inc./Maxim Integrated MAX5035DUSA+T
- Part No.:
- MAX5035DUSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5035DUSA+T.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,135
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Product details
Overview
The MAX5035DUSA+T from Maxim Integrated is a high-voltage, adjustable-output step-down DC-DC converter designed for automotive and industrial power supplies. It operates from 7.5V to 76V input, delivers up to 1A output current with 90% efficiency at 12VIN/5VOUT, features internal 0.4Ω high-side DMOS FET, fixed 125kHz PWM switching, and supports adjustable output from 1.25V to 13.2V via external resistor divider. It is used in distributed power systems requiring wide-input, high-reliability buck conversion.
For engineers reviewing the MAX5035DUSA+T datasheet, MAX5035DUSA+T pinout, MAX5035DUSA+T application, or MAX5035DUSA+T equivalent, key selection criteria include its -40°C to +125°C automotive temperature range, 270µA no-load quiescent current, integrated thermal shutdown and hiccup-mode short-circuit protection, and compatibility with standard 8-pin SO package layouts.
Technical Context
The MAX5035DUSA+T implements voltage-mode control with feed-forward compensation and an internal high-side N-channel DMOS switch. Its fixed 125kHz oscillator (109–137kHz over temp) enables predictable EMI filtering, while automatic pulse-skipping mode maintains high light-load efficiency without external circuitry.
It integrates undervoltage lockout (5.2V typ), cycle-by-cycle current limiting (1.3–2.5A), and thermal shutdown at +160°C with 20°C hysteresis. The FB pin regulates to 1.221V (±29mV), enabling precise output setting across input and load variations.
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/24V automotive batteries with headroom for transients. |
| Output Voltage Range | 1.25V to 13.2V (adjustable) - set via external resistive divider; FB regulation point is 1.221V ±29mV for <±1% output accuracy. |
| Max Output Current | 1A continuous - limited by thermal dissipation in 8-pin SO package (471mW @ +70°C, qJA = 170°C/W). |
| Switching Frequency | 125kHz (typ), 109–137kHz (min–max) - fixed-frequency PWM ensures stable EMI profile and simplifies filter design. |
| Quiescent Current | 270µA (typ) at no load - enables low-power standby operation in always-on automotive modules. |
| Shutdown Current | 10µA (typ) - reduces system-level leakage when disabled via ON/OFF pin. |
| Internal High-Side RDS(ON) | 0.4Ω (typ) - minimizes conduction loss and eliminates need for external high-voltage MOSFET. |
Pinout & Package
MAX5035DUSA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and qualified for automotive temperature range (-40°C to +125°C). Pin 1 (BST) requires a 0.1µF ceramic capacitor to LX for high-side gate drive; Pin 4 (FB) serves as precision feedback node with 1.221V reference; Pin 5 (ON/OFF) provides logic-level shutdown control with 1.69V rising threshold and 100mV hysteresis.
| 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 internal analog/digital blocks; bypassed to GND with 0.1µF ceramic capacitor. |
| 3 - SGND | Signal ground reference | Internal analog ground node; must be connected directly to system GND to ensure accurate FB regulation and noise immunity. |
| 4 - FB | Feedback input | Senses output voltage via external resistor divider; regulates to 1.221V ±29mV - sets VOUT = 1.221 × (1 + R3/R4). |
| 5 - ON/OFF | Enable/shutdown control | Logic-compatible input: <1.53V = shutdown (10µA ISHDN), >1.85V = active; 100mV hysteresis prevents chatter near threshold. |
| 6 - GND | Power ground | Main return path for high-current switch node (LX) and internal regulator; must be tied to SGND at single-point star ground. |
| 7 - VIN | Main input supply | Accepts 7.5–76V DC; requires local low-ESR bulk capacitor (e.g., 68µF aluminum + 0.1µF ceramic) placed adjacent to pin. |
| 8 - LX | Switch node | Drives external Schottky diode (e.g., 50SQ100); connects to inductor and BST capacitor; handles pulsed 1A peak currents. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-voltage DMOS switch | 0.4Ω RDS(ON) enables single-chip 76V-to-5V conversion without external high-side FET or driver. |
| Internal frequency compensation | Eliminates need for external compensation network - supports stable operation with standard LC output filters. |
| Pulse-skipping light-load mode | Reduces IQ to 270µA at no load while maintaining regulation - extends battery life in always-on automotive ECUs. |
| Hiccup-mode short-circuit protection | Shuts down on overload, retries after cooldown - prevents thermal runaway during sustained output shorts. |
| Automotive-grade thermal protection | Shuts off at +160°C junction temperature with +140°C restart hysteresis - ensures safe operation under under-hood conditions. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Power Supply |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interfaces in vehicle door modules exposed to 12V battery with load-dump transients up to 76V. IC Role / Device Role / Timing Role: Primary 12V-to-5V/3.3V buck regulator delivering 1A with automotive temperature rating and transient robustness. Use Value: Eliminates need for external TVS and pre-regulator stages due to 76V input tolerance and integrated UVLO/thermal protection. |
Use Scenario: Supplies isolated field I/O circuits in programmable logic controllers operating from 24V DC industrial rails with brownout risk. IC Role / Device Role / Timing Role: Main DC-DC stage converting 24V to 5V for digital logic and analog front-end circuitry. Use Value: 270µA quiescent current enables low-power sleep modes; 125kHz fixed frequency simplifies compliance with industrial EMI standards. |
| Distributed Telecom Power | Railway Signaling Converter |
Use Scenario: Provides local 5V/12V bias for remote radio units in 48V telecom infrastructure with strict efficiency requirements. IC Role / Device Role / Timing Role: Secondary buck converter downstream of primary 48V intermediate bus. Use Value: 90% efficiency at 500mA load reduces thermal load in enclosed cabinets; adjustable output supports multiple rail voltages from one BOM. |
Use Scenario: Converts 72V nominal railway battery (range 40–120V) to stable 5V for safety-critical signaling logic in train control systems. IC Role / Device Role / Timing Role: Input-tolerant step-down regulator meeting EN 50155 shock/vibration and temperature specs. Use Value: -40°C to +125°C operation and 76V absolute max input ensure reliability across rail voltage surges and extreme ambient conditions. |
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 |
|---|---|---|---|
| LM5017MH/NOPB | 42V max input, 100kHz switching, requires external compensation; no integrated VD regulator. | Limited to lower-input industrial systems; lacks automotive temp grade and internal bootstrap regulator. | Choose for cost-sensitive 24V-only designs where external compensation is acceptable. |
| LT8609SIS8#TRPBF | 42V max input, 2.2MHz switching, 2.5µA quiescent current, integrated MOSFETs; smaller 8-lead SOIC package. | Better suited for space-constrained, ultra-low-IQ portable applications; not rated for >42V or automotive temp. | Prefer for compact, high-frequency designs with <42V input and sub-µA standby needs. |
Compared with LM5017MH/NOPB and LT8609SIS8#TRPBF, the MAX5035DUSA+T uniquely supports 76V input and automotive temperature range while integrating both high-side switch and auxiliary VD regulator - making it optimal for ruggedized, wide-input industrial and transportation power supplies.
Availability
MAX5035DUSA+T is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLCs, distributed telecom power, and railway signaling systems requiring stable component supply across extended temperature and high-voltage stress conditions.
Supply support for MAX5035DUSA+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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX5035DUSA+T belongs to the MAXPower™ family of high-voltage DC-DC converters engineered specifically for reliable, wide-input power conversion in harsh environments such as automotive under-hood and industrial control cabinets.
FAQ
What is the maximum input voltage the MAX5035DUSA+T can withstand?
The MAX5035DUSA+T has an absolute maximum input voltage rating of +80V, with guaranteed operation up to +76V. Its internal circuitry, including the high-side DMOS switch and BST clamp, is designed to sustain this voltage continuously. For long-term reliability in automotive applications, operation within the 7.5V to 76V specified range is recommended, especially considering load-dump transients defined in ISO 7637-2.
How do I set the output voltage for the MAX5035DUSA+T?
The MAX5035DUSA+T uses an adjustable feedback architecture: connect a resistor divider from VOUT to GND, with the midpoint to the FB pin. With VFB = 1.221V, calculate R3 = R4 × (VOUT − 1.221)/1.221. For example, for 5V output and R4 = 13.3kΩ, R3 = 41.2kΩ. Keep R4 ≤ 15kΩ to minimize noise sensitivity and ensure proper bias current.
Does the MAX5035DUSA+T require external compensation components?
No, the MAX5035DUSA+T includes fully internal frequency compensation optimized for stability with standard output LC filters. The datasheet explicitly states that "internal compensation simplifies circuit implementation" and warns against adding external compensation networks, as they may degrade phase margin and cause oscillation. This eliminates layout complexity and BOM cost versus controllers like the LM5017.
What protection features does the MAX5035DUSA+T include?
The MAX5035DUSA+T integrates undervoltage lockout (5.2V typ), cycle-by-cycle current limiting (1.3–2.5A), hiccup-mode short-circuit protection, thermal shutdown (+160°C trip, +140°C recovery), and input overvoltage clamping on BST and LX pins. These features enable robust operation in unregulated industrial and automotive power environments without external protection circuitry.
Is the MAX5035DUSA+T pin-compatible with other MAX5035 variants?
Yes, all MAX5035 variants-including MAX5035A/B/C/D/E in 8-pin SO or PDIP packages-share identical pinout and footprint. The MAX5035DUSA+T differs only in internal feedback configuration (adjustable vs. fixed), allowing drop-in replacement in existing layouts when adjusting output voltage via external resistors instead of changing the IC.
MAX5035DUSA+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:
- 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+T FAQ
1.How can I place an order for MAX5035DUSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035DUSA+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 MAX5035DUSA+T reliable?
The price and inventory of MAX5035DUSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035DUSA+T is usually 5 days.
3.What payment methods are accepted for MAX5035DUSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035DUSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035DUSA+T?
MAX5035DUSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035DUSA+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 MAX5035DUSA+T?
For technical support, including MAX5035DUSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035DUSA+T requirements.
6.How does Aetrix verify that MAX5035DUSA+T is sourced from the original manufacturer or authorized distributors?
All MAX5035DUSA+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 MAX5035DUSA+T meets industry standards.
7.What is the process for return or replacement of MAX5035DUSA+T?
All MAX5035DUSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035DUSA+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 MAX5035DUSA+T part is unused and in its original packaging.
Return procedure for MAX5035DUSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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