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Analog Devices Inc./Maxim Integrated MAX5035CUSA+T
- Part No.:
- MAX5035CUSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5035CUSA+T.pdf
- Description:
- IC REG BUCK 12V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,734
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Product details
Overview
MAX5035CUSA+T from Maxim Integrated is a high-voltage, 1A step-down DC-DC converter with fixed 12V output, operating from 15V to 76V input and delivering up to 94% efficiency at 24VIN/0.5A. It integrates a 0.4Ω high-side DMOS FET, internal frequency compensation, and automotive-grade -40°C to +125°C operation in an 8-pin SO package. Used in industrial power supplies requiring robust input voltage tolerance and low quiescent current.
For engineers reviewing the MAX5035CUSA+T datasheet, MAX5035CUSA+T pinout, MAX5035CUSA+T application, or MAX5035CUSA+T equivalent, key selection criteria include its 12V fixed output, 125kHz switching frequency, 270µA no-load quiescent current, thermal shutdown at +160°C, and compatibility with external Schottky rectifiers like 50SQ100 for high-efficiency buck conversion.
Technical Context
The MAX5035CUSA+T employs voltage-mode PWM control with voltage feed-forward to maintain regulation across wide input ranges (15V–76V). Its fixed 12V output version uses internal feedback reference (VFB = 1.22V), eliminating external resistor networks - unlike adjustable variants MAX5035D/E.
It operates in fixed-frequency PWM mode under heavy load and automatically transitions to pulse-skipping mode at light loads to sustain high efficiency and ultra-low 270µA quiescent current. Protection features include cycle-by-cycle current limiting (1.9A typ), hiccup-mode short-circuit response, and thermal shutdown with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 15V to 76V - supports wide industrial and automotive battery inputs including 24V and 48V systems. |
| Output Voltage | Fixed 12V ±3% (11.64V–12.42V) - eliminates need for external feedback resistors; stable over full load (20mA–1A) and temperature (-40°C to +125°C). |
| Max Output Current | 1A continuous - limited by thermal dissipation in SO package (471mW @ +70°C, θJA = 170°C/W). |
| Switching Frequency | 125kHz (109–137kHz range) - enables use of compact 100–220µH inductors and reduces EMI compared to higher-frequency alternatives. |
| Quiescent Current | 270µA at no load - enables always-on operation in battery-backed or low-power standby systems. |
| Shutdown Current | 10µA typical - ensures minimal system leakage when disabled via ON/OFF pin. |
| Integrated High-Side FET | 0.4Ω RDS(ON) - reduces conduction losses and eliminates need for external MOSFET driver circuitry. |
Pinout & Package
MAX5035CUSA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free (+T suffix), rated for -40°C to +125°C operation. The package provides adequate thermal performance for 1A output in properly laid-out PCBs with copper pour heatsinking on VIN and LX pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Boost capacitor connection | Connects 0.1µF ceramic capacitor to LX to generate gate drive voltage for internal high-side DMOS switch. |
| VD | Internal regulator output | Provides ~7.8V regulated supply for internal circuitry and BST charging; bypass to GND with 0.1µF ceramic capacitor. |
| SGND | Signal ground reference | Internal analog ground node; must be connected directly to system GND to ensure accurate FB sensing and regulation stability. |
| FB | Feedback input | Internally tied to 12V output (fixed version); senses VOUT and compares to 1.22V reference to regulate output voltage. |
| ON/OFF | Enable/shutdown control | Logic-level input: >1.69V (typ) enables operation; <1.53V disables. Hysteresis = 100mV prevents chatter near threshold. |
| GND | Power ground | Main return path for high-current LX switching loop; must be star-connected with input/output capacitors and Schottky diode anode. |
| VIN | Main input supply | Accepts 15V–76V DC; requires low-ESR input capacitor (e.g., 68µF aluminum + 0.1µF ceramic) placed adjacent to pin. |
| LX | Switch node | Drives external Schottky rectifier (e.g., 50SQ100); connects to inductor and BST capacitor; carries high di/dt switching current. |
Key Features
| Feature | Design Value |
|---|---|
| Internal frequency compensation | Eliminates need for external compensation network - simplifies design and improves stability across all operating conditions. |
| Automotive temperature grade | -40°C to +125°C junction rating - qualified for under-hood and industrial control applications without derating. |
| Hiccup-mode short-circuit protection | Shuts down during sustained overload, then auto-retries - prevents thermal runaway and enables self-recovery after fault removal. |
| Undervoltage lockout (UVLO) | 5.2V internal threshold - prevents erratic startup below minimum operating voltage; external UVLO programming also supported via ON/OFF divider. |
| Low EMI fixed-frequency operation | 125kHz fundamental switching frequency - eases compliance with CISPR-25 Class 5 radiated emissions limits in automotive designs. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Distributed 12V rail generation from 24V/48V truck or bus battery in PLC I/O modules and sensor hubs. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering clean, regulated 12V to microcontrollers, CAN transceivers, and analog front-ends. Use Value: Wide 15V–76V input accommodates cold-crank (15V) and load-dump (76V) transients per ISO 16750-2 without external protection. | Use Scenario: Powering door lock actuators, mirror controls, and interior lighting in modern vehicle body electronics. IC Role / Device Role / Timing Role: Secondary DC-DC stage converting battery voltage to stable 12V for logic and motor drivers. Use Value: 270µA quiescent current minimizes parasitic drain during vehicle sleep mode; thermal shutdown prevents failure during prolonged actuator stall. |
| Railway Signaling Equipment | Outdoor Telecom Remote Unit |
Use Scenario: Converting 72V nominal railway traction battery to 12V for onboard controllers and communication interfaces. IC Role / Device Role / Timing Role: High-reliability step-down converter in EN 50121-3-2 compliant signaling hardware. Use Value: -40°C to +125°C operation ensures functionality across extreme ambient conditions; hiccup-mode protection handles intermittent short circuits in field wiring. | Use Scenario: Powering LTE baseband processors and RF front-ends in uncooled outdoor small cells powered from 48V PoE or solar-charged batteries. IC Role / Device Role / Timing Role: Efficient 48V-to-12V intermediate bus converter feeding downstream point-of-load regulators. Use Value: 94% peak efficiency at 24VIN/0.5A reduces heat buildup in sealed enclosures; 125kHz switching allows predictable EMI filtering. |
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, 12V fixed output, 600mA max load, requires external compensation. | Lower input voltage range and output current limit - suitable only for lighter 12V loads where 76V tolerance is unnecessary. | Select LM5017MH/NOPB only if system input never exceeds 42V and load stays ≤600mA; otherwise MAX5035CUSA+T offers superior voltage margin and headroom. |
| TPS54360BDDAR | 60V max input, adjustable output, 3.5A capability, integrated soft-start and sync capability. | Higher current and flexibility but lacks automotive temp grade and fixed 12V option - requires external feedback resistors and layout attention for stability. | Choose TPS54360BDDAR when >1A output or synchronization with other rails is required; MAX5035CUSA+T remains preferred for drop-in 12V replacement with minimal BOM and layout effort. |
Compared with LM5017MH/NOPB and TPS54360BDDAR, MAX5035CUSA+T uniquely combines 76V input tolerance, fixed 12V output, automotive temperature rating, and internal compensation - enabling simpler, more robust designs for harsh-environment 12V power rails without sacrificing efficiency or protection.
Availability
MAX5035CUSA+T is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and railway signaling applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX5035CUSA+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 precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX5035CUSA+T belongs to the MAXPower™ family of high-voltage DC-DC converters engineered specifically for reliable, efficient power conversion in environments with wide input transients and extended temperature requirements.
FAQ
What is the maximum input voltage the MAX5035CUSA+T can withstand?
The MAX5035CUSA+T supports an absolute maximum input voltage of +80V, with recommended continuous operation up to +76V. This makes it suitable for automotive load-dump events per ISO 16750-2. Operation beyond 76V is not advised for sustained use, as electrical characteristics are only guaranteed within the 15V–76V range specified in the datasheet for the MAX5035C variant. The MAX5035CUSA+T maintains regulation and protection integrity across this full range.
Does the MAX5035CUSA+T require external feedback resistors to set the output voltage?
No, the MAX5035CUSA+T does not require external feedback resistors. As a fixed-output variant (12V), its FB pin is internally connected to the regulated output. Unlike the adjustable MAX5035D/E versions, the MAX5035CUSA+T uses an internal 1.22V reference and factory-trimmed feedback network - simplifying layout and reducing component count. External resistors are unnecessary and should not be added.
What Schottky diode is recommended for use with the MAX5035CUSA+T?
The MAX5035CUSA+T datasheet specifies 50SQ100 (IR) as the recommended Schottky rectifier for 15V–76V input operation. This 100V, 5A diode provides sufficient voltage margin and low forward voltage (<0.45V at full load) to prevent conduction through the internal body diode. Alternatives include MBRM5100 (Diodes Inc.) and 50SQ80, all selected for low VF, high surge capability, and thermal robustness compatible with the MAX5035CUSA+T's 1A output.
How does the MAX5035CUSA+T behave during thermal overload?
When the MAX5035CUSA+T junction temperature exceeds +160°C, its integrated thermal sensor triggers shutdown, turning off the internal high-side switch. After cooling to +140°C (20°C hysteresis), the device automatically resumes switching in hiccup mode - cycling on/off until the fault condition clears. This protects against permanent damage during sustained overload or poor heatsinking, and is fully documented in the MAX5035CUSA+T thermal shutdown specifications.
Is the MAX5035CUSA+T pin-compatible with other MAX5035 variants like MAX5035BUSA+T?
Yes, all MAX5035 variants - including MAX5035CUSA+T, MAX5035BUSA+T, and MAX5035AUSA+T - share identical 8-pin SO packaging and pinout. They differ only in output voltage (12V, 5V, 3.3V), input voltage lower limit (15V vs. 7.5V), and minor quiescent current tolerances. This allows direct substitution in existing layouts when changing output voltage requirements, provided input voltage and load conditions remain within each variant's specified range.
MAX5035CUSA+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:
- Not For New Designs
- 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):
- 12V
- 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
MAX5035CUSA+T FAQ
1.How can I place an order for MAX5035CUSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035CUSA+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 MAX5035CUSA+T reliable?
The price and inventory of MAX5035CUSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035CUSA+T is usually 5 days.
3.What payment methods are accepted for MAX5035CUSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035CUSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035CUSA+T?
MAX5035CUSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035CUSA+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 MAX5035CUSA+T?
For technical support, including MAX5035CUSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035CUSA+T requirements.
6.How does Aetrix verify that MAX5035CUSA+T is sourced from the original manufacturer or authorized distributors?
All MAX5035CUSA+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 MAX5035CUSA+T meets industry standards.
7.What is the process for return or replacement of MAX5035CUSA+T?
All MAX5035CUSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035CUSA+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 MAX5035CUSA+T part is unused and in its original packaging.
Return procedure for MAX5035CUSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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