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Analog Devices Inc./Maxim Integrated MAX5035CASA+T
- Part No.:
- MAX5035CASA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5035CASA+T.pdf
- Description:
- IC REG BUCK 12V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,967
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Product details
Overview
The MAX5035CASA+T from Maxim Integrated is a high-voltage, 12V fixed-output, step-down DC-DC converter IC designed for automotive and industrial power supplies. It operates from 15V to 76V input, delivers up to 1A output current, achieves 94% efficiency at 24VIN/0.5A, features internal 0.4Ω high-side DMOS FET, and supports -40°C to +125°C operation in an 8-pin SO package.
For engineers reviewing the MAX5035CASA+T datasheet, MAX5035CASA+T pinout, MAX5035CASA+T application, or MAX5035CASA+T equivalent, key selection criteria include its 12V fixed output with ±3% regulation over load/line/temperature, 270µA no-load quiescent current, automotive-grade thermal shutdown at +160°C, and compatibility with external Schottky rectifiers like 50SQ100.
Technical Context
This voltage-mode buck converter uses internal voltage feed-forward control and integrated high-side DMOS switching to maintain stable regulation across wide input ranges. Its fixed 125kHz PWM operation transitions automatically to pulse-skipping mode at light loads to preserve efficiency.
The device integrates undervoltage lockout (5.2V typ), cycle-by-cycle current limiting (1.9A typ peak switch limit), hiccup-mode short-circuit protection, and thermal shutdown with 20°C hysteresis. Internal frequency compensation eliminates external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 15V to 76V - supports wide-range industrial and automotive battery inputs including 24V and 48V systems. |
| Output Voltage | 12.0V ±3% - tightly regulated fixed output suitable for powering microcontrollers, sensors, and interface ICs without external feedback resistors. |
| Max Output Current | 1A - limited by package thermal dissipation (471mW at +70°C in SO package). |
| Efficiency | 94% at VIN=24V, IOUT=0.5A - enables compact thermal design in space-constrained applications. |
| Quiescent Current | 270µA at no load - extends battery life in always-on automotive modules. |
| Switching Frequency | 125kHz (109–137kHz range) - balances EMI performance and inductor size; enables use of standard 100µH–220µH shielded inductors. |
| Shutdown Current | 10µA typ - ensures minimal standby drain during system sleep modes. |
Pinout & Package
MAX5035CASA+T is housed in an 8-pin SO (Small Outline) package with gull-wing leads, JEDEC MS-012AC compliant, RoHS-compliant and lead-free (+ suffix). Thermal resistance θJA = 170°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Boost capacitor connection | Connects 0.1µF ceramic capacitor between BST and LX to generate gate drive for internal high-side DMOS FET. |
| VD | Internal regulator output | Provides ~7.8V bias for internal circuitry; requires 0.1µF ceramic bypass to GND. |
| SGND | Signal ground reference | Internal analog ground node; must be connected directly to system GND plane. |
| FB | Feedback sense input | Internally tied to 12V output; no external divider needed for MAX5035C variant. |
| ON/OFF | Enable/shutdown control | Logic-high (>1.69V) enables operation; logic-low disables converter and reduces supply current to 10µA. |
| GND | Power ground | Main return path for high-current switching loop; connect to star ground point near rectifier and input cap. |
| VIN | Main input supply | Accepts 15–76V DC; requires low-ESR input capacitor (e.g., 68µF aluminum + 1µF ceramic) placed adjacent to pin. |
| LX | Switch node | Drives external Schottky rectifier (e.g., 50SQ100); connects to inductor and bootstrap capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side DMOS FET | 0.4Ω RDS(ON) reduces conduction loss and eliminates need for external MOSFET driver. |
| Internal frequency compensation | Enables stable closed-loop operation with only external inductor, output capacitor, and Schottky diode - no compensation network required. |
| Automotive temperature grade | -40°C to +125°C junction operation ensures reliability in under-hood and industrial control environments. |
| Pulse-skipping light-load mode | Maintains >85% efficiency down to 1mA load while holding 270µA quiescent current - critical for always-on telematics modules. |
| Hiccup-mode short-circuit protection | Prevents thermal runaway during sustained output shorts by cycling on/off until fault clears. |
Applications
| Automotive Body Control Module | Industrial PLC Power Supply |
|---|---|
Use Scenario: Powers MCU, CAN transceiver, and sensor interfaces in vehicle door modules and lighting controllers. IC Role / Device Role / Timing Role: Primary 12V buck regulator converting battery voltage (9–16V nominal, up to 76V load dump) to stable 12V rail. Use Value: Withstands automotive load-dump transients up to 76V and maintains regulation during cold-crank (down to 15V), ensuring uninterrupted operation. | Use Scenario: Supplies 12V logic and I/O circuitry in programmable logic controllers operating in factory automation environments. IC Role / Device Role / Timing Role: High-reliability DC-DC stage converting 24V or 48V industrial bus to isolated 12V auxiliary rail. Use Value: 94% efficiency at 24VIN/0.5A minimizes heat buildup in sealed enclosures; -40°C to +125°C rating supports uncooled cabinet deployment. |
| Railway Onboard Electronics | Telecom Remote Radio Unit |
Use Scenario: Provides 12V power to monitoring and communication subsystems in rolling stock electronics. IC Role / Device Role / Timing Role: Input-stage regulator accepting wide-range 24V–110V DC traction power with EN50155 compliance support. Use Value: 76V absolute max input rating accommodates railway surge standards; thermal shutdown at +160°C prevents failure during prolonged overloads. | Use Scenario: Powers FPGA, ADCs, and RF front-end bias circuits in outdoor 4G/5G remote radio heads. IC Role / Device Role / Timing Role: Point-of-load converter deriving 12V from 48V telecom plant supply in thermally constrained enclosures. Use Value: 270µA quiescent current extends uptime during grid outages; SO package allows automated assembly and reflow compatibility. |
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 |
|---|---|---|---|
| LM5009AMM/NOPB | Fixed 12V output, 1A, 75V max input, 2.1mA quiescent current, no internal compensation - requires external RC network. | Higher IQ limits battery-powered use; lacks automotive temp grade (-40°C to +125°C not guaranteed). | Choose LM5009AMM/NOPB only when external compensation is acceptable and ambient temperature stays within commercial range. |
| TPS54160DGQ | Adjustable output (1.22V–60V), 1.5A, 60V max input, 116µA IQ, integrated compensation, but no internal high-side FET - requires external MOSFET. | Not pin-compatible; requires redesign of power stage; better for variable-output or higher-current needs. | Select TPS54160DGQ if adjustable VOUT or >1A capability is required, and layout can accommodate external FET and gate driver. |
Compared with LM5009AMM/NOPB and TPS54160DGQ, the MAX5035CASA+T offers lower quiescent current (270µA vs. 2.1mA/116µA), integrated 0.4Ω FET, automotive temperature qualification, and internal compensation - making it optimal for space- and power-constrained 12V fixed-output applications where simplicity and reliability are prioritized.
Availability
MAX5035CASA+T is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC power supplies, railway onboard electronics, and telecom remote radio units requiring stable component supply with long lifecycle assurance.
Supply support for MAX5035CASA+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 MAX5035 product line delivers high-efficiency, high-input-voltage buck converters targeting harsh-environment power conversion where wide VIN range, low IQ, and automotive qualification are essential.
FAQ
What is the input voltage range supported by the MAX5035CASA+T?
The MAX5035CASA+T supports an input voltage range of 15V to 76V DC. This range is specifically validated for the MAX5035C variant (12V output version) and enables reliable operation across automotive battery systems (including load-dump conditions) and industrial 24V/48V rails. Operation below 15V is not guaranteed per datasheet specifications.
Does the MAX5035CASA+T require external feedback resistors to set the output voltage?
No, the MAX5035CASA+T does not require external feedback resistors. As a MAX5035C variant, it features a factory-trimmed 12V fixed output. The FB pin is internally connected to the output, eliminating the need for an external resistor divider - simplifying design and improving accuracy versus adjustable solutions.
What is the maximum continuous output current of the MAX5035CASA+T?
The MAX5035CASA+T delivers up to 1A continuous output current under typical thermal conditions. Actual achievable current depends on ambient temperature, PCB copper area, and input voltage - for example, at TA = +70°C, the SO package's 471mW power dissipation limit restricts usable current at high VIN. Derating curves in the datasheet define safe operating area.
Which Schottky diode is recommended for use with the MAX5035CASA+T?
The MAX5035CASA+T datasheet recommends the 50SQ100 Schottky rectifier for input voltages up to 76V. This diode provides adequate voltage margin (100V rating), low forward voltage (<0.45V at full load), and sufficient current handling (5A avg). Alternative options include MBRM5100 and B360A for lower-voltage applications.
How does the MAX5035CASA+T manage thermal overload?
The MAX5035CASA+T incorporates thermal shutdown that activates at +160°C junction temperature, turning off the internal power MOSFET. After cooling to +140°C (20°C hysteresis), it resumes operation in hiccup mode - cycling on/off until the fault condition resolves - protecting both the IC and downstream circuitry during sustained overloads.
MAX5035CASA+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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX5035CASA+T FAQ
1.How can I place an order for MAX5035CASA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035CASA+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 MAX5035CASA+T reliable?
The price and inventory of MAX5035CASA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035CASA+T is usually 5 days.
3.What payment methods are accepted for MAX5035CASA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035CASA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035CASA+T?
MAX5035CASA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035CASA+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 MAX5035CASA+T?
For technical support, including MAX5035CASA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035CASA+T requirements.
6.How does Aetrix verify that MAX5035CASA+T is sourced from the original manufacturer or authorized distributors?
All MAX5035CASA+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 MAX5035CASA+T meets industry standards.
7.What is the process for return or replacement of MAX5035CASA+T?
All MAX5035CASA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035CASA+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 MAX5035CASA+T part is unused and in its original packaging.
Return procedure for MAX5035CASA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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