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Analog Devices Inc./Maxim Integrated MAX5035DASA+
- Part No.:
- MAX5035DASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5035DASA+.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,721
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Product details
Overview
MAX5035DASA+ from Maxim Integrated is a high-voltage, adjustable-output step-down DC-DC converter with 7.5V–76V input range, 1A output current capability, and internal 0.4Ω high-side DMOS FET. It operates at fixed 125kHz PWM mode and auto-switches to pulse-skipping for light-load efficiency, delivering up to 90% efficiency at 12VIN/5VOUT/0.5A in automotive power systems.
For engineers reviewing the MAX5035DASA+ datasheet, MAX5035DASA+ pinout, MAX5035DASA+ application, or MAX5035DASA+ equivalent, key selection criteria include its adjustable 1.25V–13.2V output, 270µA no-load quiescent current, automotive-grade −40°C to +125°C operation, and integrated thermal shutdown and hiccup-mode short-circuit protection.
Technical Context
The MAX5035DASA+ employs voltage-mode control with feed-forward compensation and an internal high-side N-channel DMOS switch, eliminating external gate-drive components. Its BST pin enables bootstrap gate drive using a 0.1µF ceramic capacitor between BST and LX, supporting efficient high-side switching across the full 76V input range.
It integrates undervoltage lockout (5.2V typ), cycle-by-cycle current limiting (1.3–2.5A), thermal shutdown (+160°C trip), and a dedicated VD regulator (7.8V typ) for internal biasing. The FB pin regulates output via a resistive divider with 1.221V feedback reference, enabling precise 1.25V–13.2V adjustment independent of input or load variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports wide industrial and automotive battery rails including 12V, 24V, 48V, and 72V systems without external pre-regulation. |
| Output Voltage Range | Adjustable 1.25V to 13.2V - set via external resistor divider on FB pin; VFB = 1.221V (typ) provides ±1.5% output accuracy over temperature and line. |
| Max Output Current | 1A continuous - limited by package thermal dissipation (SO-8, θJA = 170°C/W); derates above +70°C ambient. |
| Quiescent Current | 270µA (typ) at no load - enables always-on subsystems in automotive infotainment and telematics with minimal standby drain. |
| Switching Frequency | Fixed 125kHz (109–137kHz over temp) - balances EMI, inductor size, and efficiency; eliminates need for external frequency programming. |
| Shutdown Current | 10µA (typ) - reduces system-level power consumption during deep sleep modes in battery-backed applications. |
| Internal High-Side FET RDS(ON) | 0.4Ω (typ) - minimizes conduction loss and eliminates external MOSFET, reducing BOM count and PCB area. |
Pinout & Package
MAX5035DASA+ is housed in an 8-pin SO (Small Outline) package with gull-wing leads, RoHS-compliant and lead(Pb)-free (+ suffix), rated for −40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor connection | Provides gate drive voltage for internal high-side DMOS; requires 0.1µF ceramic cap to LX for reliable startup and continuous operation. |
| VD | Internal regulator output | Supplies ~7.8V bias for internal circuitry; must be bypassed to GND with 0.1µF ceramic capacitor to stabilize regulation. |
| SGND | Signal ground reference | Internal analog ground node; must be connected directly to system GND plane to maintain feedback accuracy and noise immunity. |
| FB | Feedback input | Senses output voltage via external resistor divider; regulates to 1.221V reference - sets VOUT = 1.221 × (1 + R3/R4). |
| ON/OFF | Enable/shutdown control | Logic-level input: >1.69V (typ) enables operation; <1.53V disables; 100mV hysteresis prevents chatter near threshold. |
| GND | Power ground | Main return path for high-current switch node; must be low-impedance and star-connected to SGND and output capacitor ground. |
| VIN | Main input supply | Accepts 7.5V–76V; requires local low-ESR input capacitor (e.g., 68µF aluminum + 0.1µF ceramic) placed adjacent to pin. |
| LX | Switch node | Drives external Schottky diode (e.g., 50SQ100); connects to inductor and BST capacitor; carries high di/dt switching current. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-voltage DMOS switch | Eliminates external MOSFET and driver, reducing solution size and component count while maintaining 0.4Ω RDS(ON) performance at 76VIN. |
| Internal frequency compensation | Enables stable loop response with no external compensation network - simplifies design and improves time-to-market for buck regulators. |
| Pulse-skipping light-load mode | Maintains >85% efficiency down to 1mA load by skipping PWM cycles, critical for automotive modules with variable duty-cycle wake/sleep states. |
| Hiccup-mode short-circuit protection | Shuts down on overload, cools, then retries - prevents thermal runaway and enables self-recovery in field-deployed industrial controllers. |
| Automotive-grade temperature range | −40°C to +125°C junction operation ensures reliability in engine bay, ADAS, and under-hood electronics without derating. |
Applications
| Automotive Body Control Module (BCM) | Industrial Programmable Logic Controller (PLC) I/O Power |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface circuits in a vehicle's central body controller operating from 12V/24V battery with cold-crank (6V) and load-dump (80V) transients. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator converting raw battery to stable logic rail; handles wide VIN excursions without dropout or reset. Use Value: 76V absolute max rating and 5.2V UVLO prevent malfunction during load dump; 270µA quiescent current extends battery life in parked-state monitoring. | Use Scenario: Supplies isolated 5V/12V rails to digital I/O modules in factory automation PLCs exposed to 48V DC plant power with EMI and surge stress. IC Role / Device Role / Timing Role: Non-isolated buck converter delivering regulated output to FPGA, level shifters, and optocoupler drivers in modular I/O backplanes. Use Value: Internal 0.4Ω FET and 90% efficiency reduce heat rise in dense chassis; thermal shutdown protects against sustained overcurrent in faulted field wiring. |
| Railway Onboard Telematics Unit | Off-Grid Solar Charge Controller Auxiliary Supply |
Use Scenario: Powers GPS, cellular modem, and data logger in train-mounted telemetry units powered from 72V nominal traction battery. IC Role / Device Role / Timing Role: High-input buck regulator generating 5V for communication subsystems; withstands EN 50155 transient profiles including surges up to 100V. Use Value: 76V input rating covers worst-case railway surges; adjustable output allows flexible 3.3V/5V/12V configuration across product variants without redesign. | Use Scenario: Provides auxiliary 5V/12V supply for MCU, display, and relay drivers in solar charge controllers interfacing with 48V–60V battery banks. IC Role / Device Role / Timing Role: Primary DC-DC stage converting variable PV or battery voltage to stable system rail; operates across full battery SOC range (42V–65V). Use Value: Pulse-skipping mode maintains >80% efficiency at 10mA standby load during nighttime; shutdown current <15µA preserves battery during extended no-sun periods. |
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 | 4.5V–75V input, 1A, adjustable 1.215V–60V output; requires external compensation; no integrated VD regulator. | Higher max output voltage capability but lacks internal bias rail - needs external LDO for gate drive or analog circuitry. | Select LM5017MH/NOPB when >13.2V output or higher VIN margin (75V vs. 76V) is required; accept added compensation complexity. |
| TPS54160DGQ | 3.5V–60V input, 1.5A, adjustable 0.8V–60V; 2.5µA shutdown current; no integrated high-side FET driver bootstrap circuit. | Lower max input voltage limits use in 72V+ systems; requires external bootstrap diode/capacitor network unlike MAX5035DASA+'s integrated BST. | Choose TPS54160DGQ for ultra-low shutdown current or higher output current; verify 60V VIN limit suffices for target application. |
Compared with LM5017MH/NOPB and TPS54160DGQ, the MAX5035DASA+ uniquely integrates both a 76V-rated high-side DMOS and a dedicated VD bias regulator, enabling simpler, more robust designs in automotive and industrial 48V–72V systems where board space and reliability are critical.
Availability
MAX5035DASA+ is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O power supplies, railway telematics units, and off-grid solar charge controller auxiliary supplies requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for MAX5035DASA+ 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 series belongs to Maxim's MAXPower family of high-voltage DC-DC converters, engineered specifically for robust, compact, and efficient power conversion in harsh environments such as automotive engine compartments and industrial control cabinets.
FAQ
What is the maximum input voltage rating for the MAX5035DASA+?
The MAX5035DASA+ has an absolute maximum input voltage rating of +80V, with recommended continuous operation up to +76V. This allows safe operation across automotive load-dump transients (up to +87V per ISO 7637-2) when combined with appropriate input clamping. The device enters undervoltage lockout below 5.2V (typ), ensuring clean startup after brownout events.
How do I configure the output voltage for the MAX5035DASA+?
The MAX5035DASA+ features an adjustable output voltage set via a resistive divider from VOUT to GND, with the midpoint connected to the FB pin. Using the formula VOUT = 1.221V × (1 + R3/R4), select R4 ≤ 15kΩ and calculate R3 accordingly. For example, to achieve 5V output, use R4 = 13.3kΩ and R3 = 41.2kΩ. The MAX5035DASA+ regulates precisely to the 1.221V internal reference.
Does the MAX5035DASA+ require external compensation components?
No, the MAX5035DASA+ includes fully internal frequency compensation optimized for stability with standard external LC filter components. No external Type II or Type III compensation network is needed - simply connect the recommended 100µH inductor and 68µF output capacitor as specified in the typical application circuit. This simplifies layout and eliminates tuning iterations during prototyping.
What protection features are built into the MAX5035DASA+?
The MAX5035DASA+ integrates multiple hardware-based protections: undervoltage lockout (UVLO) at 5.2V (typ), cycle-by-cycle peak current limiting (1.3–2.5A), hiccup-mode short-circuit response, thermal shutdown at +160°C with +20°C hysteresis, and input overvoltage tolerance up to +80V. These operate independently of external control, ensuring fail-safe behavior under fault conditions without firmware dependency.
Can the MAX5035DASA+ operate in pulse-skipping mode, and how does it affect efficiency?
Yes, the MAX5035DASA+ automatically transitions from fixed-frequency PWM to pulse-skipping mode below ~85mA load current. This reduces switching losses and maintains >85% efficiency down to 1mA, significantly improving light-load performance compared to forced-PWM alternatives. Quiescent current remains at 270µA (typ) in this mode, making it ideal for always-on automotive modules.
MAX5035DASA+ 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:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7.5V
- Voltage - Input (Max):
- 76V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 13.2V
- 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
MAX5035DASA+ FAQ
1.How can I place an order for MAX5035DASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035DASA+ 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 MAX5035DASA+ reliable?
The price and inventory of MAX5035DASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035DASA+ is usually 5 days.
3.What payment methods are accepted for MAX5035DASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035DASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035DASA+?
MAX5035DASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035DASA+ 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 MAX5035DASA+?
For technical support, including MAX5035DASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035DASA+ requirements.
6.How does Aetrix verify that MAX5035DASA+ is sourced from the original manufacturer or authorized distributors?
All MAX5035DASA+ 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 MAX5035DASA+ meets industry standards.
7.What is the process for return or replacement of MAX5035DASA+?
All MAX5035DASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035DASA+, 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 MAX5035DASA+ part is unused and in its original packaging.
Return procedure for MAX5035DASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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