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Analog Devices Inc./Maxim Integrated MAX5035AASA+T
- Part No.:
- MAX5035AASA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5035AASA+T.pdf
- Description:
- IC REG BUCK 3.3V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,748
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Product details
Overview
The MAX5035AASA+T 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 125kHz PWM with automatic pulse-skipping mode for light-load efficiency-used in automotive power supplies requiring robust input voltage tolerance and thermal resilience.
For engineers reviewing the MAX5035AASA+T datasheet, MAX5035AASA+T pinout, MAX5035AASA+T application, or MAX5035AASA+T equivalent, key selection criteria include its -40°C to +125°C automotive temperature rating, 8-pin SO package, undervoltage lockout (5.2V), 3.3V ±3.5% output accuracy over full load/temperature, and hiccup-mode short-circuit protection.
Technical Context
The MAX5035AASA+T employs voltage-mode control with feed-forward compensation and an integrated high-side N-channel DMOS switch. Its fixed 125kHz oscillator (105–137kHz over temperature) enables predictable EMI filtering, while pulse-skipping mode reduces switching losses below ~85mA load to maintain >86% efficiency at 0.5A/12VIN.
Internal protection includes cycle-by-cycle current limiting (1.3–2.5A peak), thermal shutdown at +160°C with 20°C hysteresis, and undervoltage lockout. The device uses BST-bootstrapped gate drive for the high-side switch and features dedicated VD regulator output (7.8V typ) for biasing external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports wide automotive battery transients (cold crank, load dump) without external pre-regulation |
| Output Voltage | 3.3V ±3.5% (3.185V–3.415V) - tightly regulated for MCU/Sensor rail compliance across 20mA–1A load and -40°C to +125°C |
| Max Output Current | 1A - limited by thermal dissipation in SO package (471mW @ 70°C ambient, qJA = 170°C/W) |
| Quiescent Current | 270µA (typ) at no load - enables always-on systems (e.g., CAN wake-up circuits) with minimal standby drain |
| Switching Frequency | 125kHz (105–137kHz over temp) - balances EMI performance, inductor size, and efficiency for industrial power rails |
| High-Side RDS(ON) | 0.4Ω (typ) - reduces conduction loss and heat generation vs. discrete MOSFET solutions |
| Shutdown Current | 10µA (typ) - ensures ultra-low power-off state for battery-backed modules |
Pinout & Package
MAX5035AASA+T is housed in an 8-pin SO (Small Outline) package, JEDEC MS-012AC, with exposed pad not electrically connected. Thermal resistance θJA = 170°C/W (JEDEC 51).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor connection | Drives high-side gate via 0.1µF ceramic cap between BST and LX; enables N-MOSFET operation without external charge pump |
| VD | Internal regulator output | 7.8V regulated supply for internal analog/digital blocks; bypassed with 0.1µF ceramic to GND for noise immunity |
| SGND | Signal ground reference | Internal analog ground node; must be tied to system GND at single point to avoid ground bounce in feedback path |
| FB | Feedback input | 3.3V output directly connected (no divider); senses VOUT to regulate at 1.22V internal reference |
| ON/OFF | Enable/shutdown control | Logic-level input (1.69V rising threshold, 100mV hysteresis); pulls low to enter 10µA shutdown state |
| GND | Power ground | Return path for high-current LX switching node; connects to PCB ground plane under IC for thermal relief |
| VIN | Main input supply | Accepts 7.5–76V; requires local low-ESR bulk capacitor (e.g., 68µF aluminum + 0.1µF ceramic) near pin |
| LX | Switch node | Drains high-side DMOS source; connects to inductor and Schottky cathode; critical for EMI and thermal layout |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.4Ω high-side DMOS FET | Eliminates external MOSFET and driver, reducing BOM count and PCB area while maintaining >90% efficiency at 1A |
| Internal frequency compensation | Enables stable loop response with single LC output filter-no external compensation network required |
| Hiccup-mode short-circuit protection | Prevents thermal runaway during sustained overload by cycling ON/OFF instead of continuous current limiting |
| Automotive-grade temperature range | -40°C to +125°C junction operation validated per AEC-Q100 stress tests-suitable for engine bay and ADAS power rails |
| Pulse-skipping light-load mode | Maintains >80% efficiency down to 10mA load, extending battery life in intermittent-sensing applications |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Power Supply |
|---|---|
Use Scenario: Powering microcontrollers, CAN transceivers, and sensor interfaces in door modules and lighting controllers exposed to 12V/24V battery variations and load dump spikes. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator delivering clean, thermally robust power with UVLO and hiccup protection against wiring faults. Use Value: Eliminates need for external TVS and pre-regulator stages due to 76V input tolerance and integrated protections. | Use Scenario: Providing isolated 3.3V logic rail for digital I/O expansion cards in programmable logic controllers operating in factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: High-reliability DC-DC converter supplying constant 3.3V to FPGA configuration memory and level-shifting buffers. Use Value: 170°C/W thermal resistance and -40°C to +125°C rating ensure uninterrupted operation during extended thermal cycling. |
| Railway Onboard Telematics Unit | Commercial HVAC Controller |
Use Scenario: Converting 72V nominal traction battery to 3.3V for GPS/GSM modems and real-time clocks in train-mounted data loggers. IC Role / Device Role / Timing Role: Input-tolerant step-down regulator enabling direct battery connection without intermediate 24V bus. Use Value: 270µA quiescent current extends backup runtime during vehicle shutdown; 125kHz switching simplifies EMI filtering for EN 50121 compliance. | Use Scenario: Powering 3.3V Wi-Fi/BLE modules and environmental sensors in wall-mounted HVAC thermostats powered from 24VAC rectified supplies. IC Role / Device Role / Timing Role: Efficient, compact DC-DC stage converting rectified 24–36VDC to stable 3.3V for wireless connectivity subsystems. Use Value: Pulse-skipping mode maintains >85% efficiency at 50mA sleep current, minimizing self-heating in sealed enclosures. |
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 3.3V output, 100V max input, 500mA output, 1MHz switching, no integrated VD regulator | Lower current capability; suited for space-constrained, lower-power nodes where higher frequency allows smaller magnetics | Select when board area is critical and load ≤500mA; verify external bias supply for control circuitry |
| TPS54360DGQR | Adjustable output (1.22V–60V), 60V max input, 3.5A output, 100kHz–2.5MHz sync capability, no VD rail | Higher current and flexibility but requires external feedback divider and bias supply; lacks automotive temp grade | Choose for designs needing >1A or programmable output; confirm -40°C to +125°C operation with derating |
Compared with LM5008AMM/NOPB and TPS54360DGQR, the MAX5035AASA+T delivers guaranteed 1A output at 3.3V across full automotive temperature range with integrated VD bias rail and hiccup-mode fault protection-reducing external component count and validation effort for ruggedized 12V/24V systems.
Availability
MAX5035AASA+T is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, and railway telematics requiring stable component supply with AEC-Q100-aligned reliability and long-term lifecycle support.
Supply support for MAX5035AASA+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-input-voltage, high-efficiency buck converters optimized for automotive and industrial power rails where wide VIN range, thermal resilience, and integrated protection are mandatory.
FAQ
What is the maximum input voltage the MAX5035AASA+T can withstand continuously?
The MAX5035AASA+T supports continuous operation up to 76V input voltage, with absolute maximum rating of +80V on VIN. This enables direct connection to 24V and 48V industrial buses and automotive batteries experiencing load dump transients, provided external input capacitance and layout meet ripple current and thermal requirements.
Does the MAX5035AASA+T require external compensation components?
No, the MAX5035AASA+T includes fully internal frequency compensation optimized for stability with standard LC output filters. No external compensation network is needed-only the recommended 68µF output capacitor and 100µH inductor per the typical application circuit ensure robust transient response and phase margin.
How does the MAX5035AASA+T handle short-circuit conditions?
The MAX5035AASA+T implements hiccup-mode short-circuit protection: upon detecting overcurrent, it shuts down for ~30ms, then attempts restart. If the fault persists, it repeats the cycle-limiting average power dissipation and preventing thermal damage while allowing automatic recovery once the fault clears.
Can the MAX5035AASA+T operate with an input voltage below 7.5V?
No-the MAX5035AASA+T has a minimum specified input voltage of 7.5V. Below this, undervoltage lockout prevents operation. For 5V-input applications, consider the MAX5035DASA+T (adjustable version) with external feedback divider, though its minimum VIN remains 7.5V per datasheet specifications.
What is the purpose of the VD pin on the MAX5035AASA+T?
VD is the output of an internal 7.8V linear regulator used to power the MAX5035AASA+T's analog and gate-drive circuitry. It must be bypassed with a 0.1µF ceramic capacitor to GND. While not intended as a user-supply rail, it can optionally power external bias circuitry if current draw remains ≤5mA and noise coupling is controlled.
MAX5035AASA+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):
- 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+T FAQ
1.How can I place an order for MAX5035AASA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035AASA+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 MAX5035AASA+T reliable?
The price and inventory of MAX5035AASA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035AASA+T is usually 5 days.
3.What payment methods are accepted for MAX5035AASA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035AASA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035AASA+T?
MAX5035AASA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035AASA+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 MAX5035AASA+T?
For technical support, including MAX5035AASA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035AASA+T requirements.
6.How does Aetrix verify that MAX5035AASA+T is sourced from the original manufacturer or authorized distributors?
All MAX5035AASA+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 MAX5035AASA+T meets industry standards.
7.What is the process for return or replacement of MAX5035AASA+T?
All MAX5035AASA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035AASA+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 MAX5035AASA+T part is unused and in its original packaging.
Return procedure for MAX5035AASA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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