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Analog Devices Inc./Maxim Integrated MAX5035BUSA+T
- Part No.:
- MAX5035BUSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5035BUSA+T.pdf
- Description:
- IC REG BUCK 5V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,446
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Product details
Overview
The MAX5035BUSA+T from Maxim Integrated is a high-voltage, 1A step-down DC-DC converter with fixed 5V output, operating from 7.5V to 76V input and delivering up to 90% efficiency at 12VIN/0.5AOUT. It integrates a 0.4Ω high-side DMOS FET, internal frequency compensation, and operates at a fixed 125kHz switching frequency with pulse-skipping mode for light-load efficiency. Used in automotive power supplies where wide VIN and low quiescent current (270µA no-load) are critical.
For engineers reviewing the MAX5035BUSA+T datasheet, MAX5035BUSA+T pinout, MAX5035BUSA+T application, or MAX5035BUSA+T equivalent, key selection criteria include input voltage range (7.5–76V), fixed 5V output tolerance (±2.5%), thermal shutdown at +160°C, and SO-8 package compatibility with automotive temperature range (0°C to +85°C).
Technical Context
This voltage-mode buck regulator uses feed-forward control and an internal high-side N-channel DMOS switch to maintain regulation across a 10:1 input voltage range. Its fixed-frequency PWM operation transitions automatically to pulse-skipping mode below ~85mA load to reduce IQ to 270µA.
Protection features include cycle-by-cycle current limiting (1.9A typ peak switch current), hiccup-mode short-circuit response, undervoltage lockout (5.2V typ), and thermal shutdown with 20°C hysteresis. The device requires external Schottky diode (e.g., 50SQ100) and 100µH inductor for full implementation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports 12V/24V/48V industrial and automotive battery systems with transient tolerance up to 80V. |
| Output Voltage | 5.0V ±2.5% - tightly regulated fixed output suitable for powering microcontrollers, sensors, and interface ICs. |
| Max Output Current | 1A - limited by thermal dissipation in SO-8 package (471mW @ +70°C, θJA = 170°C/W). |
| Switching Frequency | 125kHz (109–137kHz range) - enables use of compact magnetics while minimizing EMI in sensitive applications. |
| Quiescent Current | 270µA at no load - enables always-on functionality in battery-backed systems without rapid drain. |
| Shutdown Current | 10µA typ - allows deep sleep states via ON/OFF pin control for system-level power management. |
| Internal High-Side FET RDS(ON) | 0.4Ω max - reduces conduction loss and eliminates need for external high-voltage MOSFET. |
Pinout & Package
MAX5035BUSA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free (+T suffix), rated for 0°C to +85°C ambient operation. Thermal pad is not present; PCB copper pour on GND pins aids heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor connection | Provides gate drive voltage for internal high-side DMOS; requires 0.1µF ceramic cap between BST and LX. |
| VD | Internal regulator output | Supplies bias for gate driver; bypassed to GND with 0.1µF ceramic capacitor. |
| SGND | Signal ground reference | Internal analog ground node; must be connected directly to system GND plane. |
| FB | Feedback input | Connected directly to VOUT for fixed 5V operation; internal 1.22V reference sets regulation point. |
| ON/OFF | Enable/shutdown control | Logic-high (>1.69V) enables operation; logic-low disables switching and reduces IQ to 10µA. |
| GND | Power ground | Main return path for high-current switch node and regulator; tied to SGND externally. |
| VIN | Main input supply | Accepts 7.5–76V; requires local low-ESR bulk capacitance (e.g., 68µF aluminum + 0.1µF ceramic). |
| LX | Switch node | Drives external Schottky diode cathode and inductor; high dv/dt node requiring tight layout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.4Ω high-voltage DMOS FET | Eliminates external high-side switch, reducing BOM count and PCB area in high-input-voltage buck designs. |
| Internal frequency compensation | Enables stable operation with minimal external components-no loop compensation network required. |
| Pulse-skipping light-load mode | Maintains >85% efficiency down to 1mA load, critical for intermittent-sensing applications. |
| Hiccup-mode short-circuit protection | Prevents thermal runaway during sustained output faults by cycling ON/OFF until fault clears. |
| Automotive-grade SO-8 package | Validated for 0°C to +85°C operation with JEDEC moisture sensitivity level 1-suitable for under-hood environments. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power Supply |
|---|---|
Use Scenario: Powers MCU, CAN transceiver, and sensor interfaces in 12V/24V vehicle electrical systems with cold-crank (6.5V) and load-dump (80V) transients. IC Role / Device Role / Timing Role: Primary 5V rail generator with UVLO set to 6.5V via external resistor divider on ON/OFF pin. Use Value: Maintains regulation through 7.5–76V input range and delivers 1A with <2.5% output deviation over line/load/temperature. | Use Scenario: Supplies isolated 5V logic rails for digital I/O modules in factory automation controllers exposed to 48V DC bus noise. IC Role / Device Role / Timing Role: Non-isolated buck converter providing clean, efficient 5V from noisy industrial DC bus. Use Value: 90% efficiency at 12VIN/0.5AOUT minimizes heat rise in enclosed DIN-rail enclosures; 170°C/W θJA enables natural convection cooling. |
| Railway Onboard Telematics Unit | Energy Meter Auxiliary Power |
Use Scenario: Powers LTE modem, GPS receiver, and secure element in train-mounted data loggers operating from 72V nominal traction battery. IC Role / Device Role / Timing Role: High-reliability 5V source with thermal shutdown at +160°C and hiccup-mode fault recovery. Use Value: Withstands 76V continuous input and 80V absolute max; 10µA shutdown current extends backup battery life during idle periods. | Use Scenario: Derives 5V auxiliary power from 100–300V AC rectified bus in smart electricity meters with strict energy budget. IC Role / Device Role / Timing Role: Input-stage buck converter feeding isolated DC-DC stage; operates in pulse-skipping mode during meter sleep cycles. Use Value: 270µA no-load IQ ensures <1mW standby consumption-critical for meeting IEC 62053-21 Class 0.5S auxiliary power limits. |
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 |
|---|---|---|---|
| LM5008AMM/NOPB | Fixed 5V output, 100V max input, 500mA output, 1MHz switching, no integrated bootstrap circuit. | Lower output current and higher fSW limit use in space-constrained but lower-power applications; requires external bootstrap diode/cap. | Select when 500mA suffices and board area is premium; avoid if 1A or 76V+ operation required. |
| TPS54360DDAR | Adjustable output (1.22–60V), 60V max input, 3.5A output, 100kHz–2.5MHz sync capability, integrated soft-start. | Higher current and adjustable VOUT support flexible multi-rail designs; lacks automotive temp grade in base variant. | Choose for scalable 3.5A designs needing programmable output; verify -40°C to +125°C qualification for automotive use. |
Compared with LM5008AMM/NOPB and TPS54360DDAR, the MAX5035BUSA+T offers superior 1A output in automotive-temp SO-8 at 76V max input, with integrated bootstrap and fixed 5V-ideal for cost-sensitive, high-reliability 5V rail generation where simplicity and ruggedness outweigh programmability.
Availability
MAX5035BUSA+T is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O power supplies, railway telematics units, and energy meter auxiliary power requiring stable component supply across extended temperature and high-input-voltage conditions.
Supply support for MAX5035BUSA+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 MAX5035BUSA+T belongs to the MAXPower™ family of high-voltage DC-DC converters engineered for robust operation in harsh environments-specifically targeting 12V/24V/48V automotive and industrial systems needing reliable 5V rails from wide-input sources.
FAQ
What is the maximum input voltage rating for the MAX5035BUSA+T?
The MAX5035BUSA+T has an absolute maximum input voltage rating of +80V, with continuous operation specified from 7.5V to 76V. Operation beyond 76V is not guaranteed and may trigger internal protection circuits. The device is designed to withstand automotive load-dump transients up to 80V for short durations per ISO 7637-2.
Does the MAX5035BUSA+T require external compensation components?
No, the MAX5035BUSA+T includes internal frequency compensation optimized for stability with standard external components. No external compensation network is needed-only the required BST and VD bypass capacitors (0.1µF each), input/output bulk capacitors, inductor, and Schottky diode must be added per the typical application circuit.
How does the MAX5035BUSA+T handle short-circuit conditions on its output?
The MAX5035BUSA+T employs hiccup-mode short-circuit protection: when output current exceeds the cycle-by-cycle limit (~1.9A), the device shuts down for ~30ms, then attempts restart. This prevents thermal runaway and excessive power dissipation during sustained faults, allowing safe recovery once the short is removed.
Can the MAX5035BUSA+T be used in automotive applications requiring -40°C to +125°C operation?
No-the MAX5035BUSA+T is rated for 0°C to +85°C ambient operation. For automotive under-hood applications, use the MAX5035BASA/V+ variant, which is qualified for -40°C to +125°C and carries the /V+ automotive qualification marking. The "USA" suffix denotes commercial-temperature SO-8 packaging.
What external components are mandatory for basic operation of the MAX5035BUSA+T?
Mandatory external components for the MAX5035BUSA+T include: a 0.1µF ceramic capacitor between BST and LX; a 0.1µF ceramic capacitor from VD to GND; a Schottky rectifier (e.g., 50SQ100); a 100µH power inductor; input bulk capacitance (e.g., 68µF aluminum + 0.1µF ceramic); and output capacitance (e.g., 68µF tantalum). FB is connected directly to VOUT for fixed 5V operation.
MAX5035BUSA+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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7.5V
- Voltage - Input (Max):
- 76V
- Voltage - Output (Min/Fixed):
- 5V
- 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
MAX5035BUSA+T FAQ
1.How can I place an order for MAX5035BUSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035BUSA+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 MAX5035BUSA+T reliable?
The price and inventory of MAX5035BUSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035BUSA+T is usually 5 days.
3.What payment methods are accepted for MAX5035BUSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035BUSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035BUSA+T?
MAX5035BUSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035BUSA+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 MAX5035BUSA+T?
For technical support, including MAX5035BUSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035BUSA+T requirements.
6.How does Aetrix verify that MAX5035BUSA+T is sourced from the original manufacturer or authorized distributors?
All MAX5035BUSA+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 MAX5035BUSA+T meets industry standards.
7.What is the process for return or replacement of MAX5035BUSA+T?
All MAX5035BUSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035BUSA+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 MAX5035BUSA+T part is unused and in its original packaging.
Return procedure for MAX5035BUSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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