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Analog Devices Inc./Maxim Integrated MAX5035AASA
- Part No.:
- MAX5035AASA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5035AASA.pdf
- Description:
- IC REG BUCK 3.3V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,310
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Product details
Overview
MAX5035AASA from Maxim Integrated is a high-voltage, 1A step-down DC-DC converter with fixed 3.3V output, operating from 7.5V to 76V input and consuming only 270µA quiescent current at no load. It integrates a 0.4Ω high-side DMOS FET, internal frequency compensation, and operates at a fixed 125kHz switching frequency with automatic pulse-skipping mode for light-load efficiency. Used in automotive power supplies where wide VIN range and -40°C to +125°C operation are required.
For engineers reviewing the MAX5035AASA datasheet, MAX5035AASA pinout, MAX5035AASA application, or MAX5035AASA equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade thermal behavior, and real-world design constraints including BST capacitor routing, FB feedback tolerance (±3.5%), and ON/OFF control hysteresis (100mV).
Technical Context
The MAX5035AASA implements voltage-mode PWM control with feed-forward compensation, enabling stable regulation across its full 7.5V–76V input range while maintaining tight output accuracy (±3.5% over temperature and line/load). Its integrated 0.4Ω high-side DMOS switch and internal 7.8V VD regulator eliminate external gate-drive components and simplify bootstrap circuitry using only a 0.1µF BST capacitor.
Thermal protection activates at +160°C junction temperature with +20°C hysteresis, and undervoltage lockout triggers at 5.2V (typ) on VIN-enabling reliable startup in automotive battery environments. The device supports external UVLO programming via ON/OFF pin with 1.69V rising threshold and 100mV hysteresis, allowing custom brown-out thresholds down to 6.5V for 3.3V output systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports cold-crank (6.5V min with external UVLO) and load-dump (80V abs max) conditions in automotive systems. |
| Output Voltage | 3.3V ±3.5% - tightly regulated fixed output suitable for powering microcontrollers, sensors, and CAN transceivers. |
| Max Output Current | 1A continuous - limited by SO package thermal resistance (170°C/W) and internal 1.9A peak switch current limit. |
| Quiescent Current | 270µA at no load - enables always-on subsystems (e.g., body control modules) without excessive battery drain. |
| Switching Frequency | 125kHz (109–137kHz over temp) - balances EMI performance and inductor size; fixed frequency simplifies EMI filtering. |
| Shutdown Current | 10µA (typ) - ensures ultra-low standby power when ON/OFF pin is pulled low. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 stress test requirements. |
Pinout & Package
MAX5035AASA is housed in an 8-pin SO (Small Outline) package with exposed pad for thermal enhancement, rated for -40°C to +125°C operation. Pin 1 (BST) requires a 0.1µF ceramic capacitor to LX; Pin 4 (FB) connects directly to VOUT for fixed 3.3V operation; Pin 5 (ON/OFF) enables shutdown with 1.69V threshold and 100mV hysteresis.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BST | Bootstrap capacitor connection | Provides gate drive voltage for internal high-side DMOS; must be decoupled to LX with 0.1µF ceramic capacitor placed adjacent to IC. |
| 2 - VD | Internal regulator output | Supplies 7.8V (±1.3V) bias for internal circuitry; bypassed to GND with 0.1µF ceramic capacitor to stabilize startup and reduce noise. |
| 3 - SGND | Signal ground reference | Internal analog ground node; must be connected to system GND at single-point star ground to avoid noise coupling into FB path. |
| 4 - FB | Feedback input | Connects directly to VOUT for MAX5035A; regulates output to 3.3V with 1.22V internal reference and ±150nA input bias current. |
| 5 - ON/OFF | Enable/shutdown control | Pull low (<0.3V) to enter 10µA shutdown; rising threshold = 1.69V (typ), hysteresis = 100mV - supports external UVLO resistor divider. |
| 6 - GND | Power ground | Main return path for high-current LX switching node; must be tied to SGND at single point and connected to thermal pad for heatsinking. |
| 7 - VIN | Main input supply | Accepts 7.5V–76V; requires low-ESR input capacitor (e.g., 68µF aluminum + 1µF ceramic) placed near pin to suppress ripple and EMI. |
| 8 - LX | Switch node | Drives external Schottky diode (e.g., 50SQ100); swings from GND to VIN; requires short PCB trace and Kelvin connection to minimize ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.4Ω high-side DMOS FET | Eliminates need for external MOSFET and driver, reducing BOM count and layout complexity while delivering >90% efficiency at 0.5A/12VIN. |
| Internal frequency compensation | Enables stable operation with minimal external components - no external compensation network required for standard LC filter designs. |
| Pulse-skipping mode at light loads | Maintains >80% efficiency down to 1mA load by skipping cycles, critical for battery-backed automotive modules with variable duty cycles. |
| Hiccup-mode short-circuit protection | Shuts down and auto-restarts during sustained overload, preventing thermal runaway and enabling self-recovery without system intervention. |
| Automotive-grade thermal shutdown | Triggers at +160°C junction temperature with +20°C hysteresis, ensuring safe operation in under-hood environments with ambient up to +125°C. |
Applications
| Automotive Body Control Module | Industrial Sensor Power Supply |
|---|---|
Use Scenario: Powers microcontroller, LIN transceiver, and door-lock actuators from 12V battery with cold-crank (6.5V) and load-dump (80V) transients. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator providing clean, regulated rail with <100mV output ripple and fast transient response to actuator pulses. Use Value: Enables single-chip solution meeting ISO 7637-2 pulse 4 (cold crank) and pulse 5a/b (load dump) without external TVS or pre-regulator. |
Use Scenario: Supplies 3.3V to MEMS pressure sensors and 4–20mA loop transmitters in hazardous-area process instrumentation. IC Role / Device Role / Timing Role: Isolated secondary-side DC-DC converter delivering intrinsically safe power with low leakage and high PSRR. Use Value: Supports wide-input industrial supplies (24V–48V DC) while maintaining <270µA quiescent current for energy harvesting compatibility. |
| Railway Onboard Telematics Unit | Commercial Vehicle ADAS Camera Power |
Use Scenario: Powers ARM-based telematics processor and cellular modem from 72V nominal railway battery with extended temperature range. IC Role / Device Role / Timing Role: High-efficiency primary buck stage stepping 72V down to 3.3V, feeding downstream LDOs for core and I/O rails. Use Value: Delivers 1A continuous output at 94% efficiency (24VIN/3.3VOUT) while surviving EN 50155 shock/vibe and thermal cycling. |
Use Scenario: Provides 3.3V rail to CMOS image sensor and ISP in rear-view camera exposed to under-bumper temperatures. IC Role / Device Role / Timing Role: Compact, thermally robust buck converter mounted directly on camera PCB with minimal external components. Use Value: SO package with exposed pad achieves 125°C ambient operation without heatsink; 10µA shutdown current extends parking-mode runtime. |
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 | Fixed 100kHz frequency, 65V max input, no integrated VD regulator - requires external bootstrap and bias supplies. | Lacks automotive temp grade (-40°C to +125°C) and integrated VD; requires additional components for same functionality. | Select when lower cost is prioritized over design simplicity and automotive qualification; verify external bias circuit stability. |
| TPS54360DGQ | 60V max input, adjustable output only, 3.5µA shutdown current - higher IQ (145µA) and no PFM mode. | Not qualified for automotive temperature range; unsuitable for 76V input or ultra-low-quiescent always-on systems. | Choose only for non-automotive 24V/48V industrial systems where 3.3V output is generated via external resistive divider and thermal margin is ample. |
Compared with LM5017MH/NOPB and TPS54360DGQ, the MAX5035AASA uniquely combines 76V input capability, integrated VD regulator, 270µA quiescent current, and AEC-Q100-compatible temperature range in a single 8-pin SO package - eliminating external bias, gate-drive, and UVLO components required by alternatives.
Availability
MAX5035AASA is available at Aetrix Electronics and suitable for automotive body control, industrial sensor power, railway telematics, and commercial vehicle ADAS camera systems requiring stable component supply across extended temperature and high-voltage transients.
Supply support for MAX5035AASA 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 applications in automotive, industrial, and communications markets.
The MAX5035 product line delivers high-voltage, high-efficiency step-down converters optimized for automotive power systems where input transients, thermal extremes, and ultra-low quiescent current are critical design constraints.
FAQ
What is the maximum input voltage rating for MAX5035AASA?
The MAX5035AASA has an absolute maximum input voltage rating of +80V, with recommended continuous operation up to +76V. This allows it to withstand automotive load-dump transients defined in ISO 7637-2 Pulse 5b (up to +76V for 400ms). Operation beyond 76V is not guaranteed and may trigger internal protection circuits or cause permanent damage.
Does MAX5035AASA require external compensation components?
No, the MAX5035AASA includes fully internal frequency compensation optimized for standard buck converter topologies. No external RC networks or compensation pins are needed - simplifying layout and reducing BOM count. However, proper PCB layout (star grounding, short BST/VIN/LX traces) remains essential for stability.
How does the ON/OFF pin function on MAX5035AASA?
The ON/OFF pin on MAX5035AASA controls enable/disable state: pulling it below 0.3V places the device in shutdown (10µA IQ), while driving it above 1.69V (typ) with ≥100mV hysteresis enables normal operation. It also supports external UVLO programming using a resistor divider from VIN to GND, setting custom turn-on thresholds as low as 6.5V for 3.3V output systems.
What is the purpose of the VD pin on MAX5035AASA?
The VD pin on MAX5035AASA provides a regulated 7.8V (±1.3V) internal supply for analog and gate-drive circuitry. It must be bypassed to GND with a 0.1µF ceramic capacitor placed adjacent to the pin. This rail powers the internal oscillator, error amplifier, and high-side driver - eliminating need for external bias supplies and improving startup reliability.
Can MAX5035AASA be used with an adjustable output voltage?
No - MAX5035AASA is a fixed-output variant configured for 3.3V. Only MAX5035D/E versions support adjustable output (1.25V–13.2V) via external resistor divider on the FB pin. Attempting to use MAX5035AASA in adjustable mode will result in incorrect regulation, as its internal feedback reference is hardwired to 3.3V and lacks the necessary VFB precision for external scaling.
MAX5035AASA 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7.5V
- Voltage - Input (Max):
- 76V
- Voltage - Output (Min/Fixed):
- 3.3V
- 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
MAX5035AASA FAQ
1.How can I place an order for MAX5035AASA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035AASA 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 MAX5035AASA reliable?
The price and inventory of MAX5035AASA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035AASA is usually 5 days.
3.What payment methods are accepted for MAX5035AASA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035AASA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035AASA?
MAX5035AASA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035AASA 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 MAX5035AASA?
For technical support, including MAX5035AASA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035AASA requirements.
6.How does Aetrix verify that MAX5035AASA is sourced from the original manufacturer or authorized distributors?
All MAX5035AASA 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 MAX5035AASA meets industry standards.
7.What is the process for return or replacement of MAX5035AASA?
All MAX5035AASA units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035AASA, 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 MAX5035AASA part is unused and in its original packaging.
Return procedure for MAX5035AASA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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