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Analog Devices Inc./Maxim Integrated MAX5035DASA/V+T
- Part No.:
- MAX5035DASA/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5035DASA/V+T.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,841
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Product details
Overview
MAX5035DASA/V+T from Maxim Integrated is an automotive-grade, adjustable-output, high-voltage step-down DC-DC converter with 7.5V–76V input range, 1A output current capability, internal 0.4Ω high-side DMOS FET, and fixed 125kHz PWM switching. It delivers regulated 1.25V–13.2V output in harsh environments such as vehicle power systems and industrial control units.
For engineers reviewing the MAX5035DASA/V+T datasheet, MAX5035DASA/V+T pinout, MAX5035DASA/V+T application, or MAX5035DASA/V+T equivalent, key selection criteria include its wide-input automotive qualification (-40°C to +125°C), low 270µA no-load quiescent current, internal frequency compensation, and adjustable feedback architecture requiring external resistor divider for VOUT setting.
Technical Context
The MAX5035DASA/V+T implements voltage-mode PWM control with feed-forward compensation and automatic pulse-skipping mode at light loads. Its internal high-side DMOS switch operates with 0.4Ω typical RDS(ON) and supports up to 95% maximum duty cycle.
It integrates undervoltage lockout (5.2V typ), thermal shutdown (+160°C trip), hiccup-mode short-circuit protection, and a dedicated internal regulator (VD = 6.5–9.0V) for gate drive and analog circuitry-enabling robust operation across 7.5V–76V inputs without external bias rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports direct connection to 12V/24V/48V vehicle batteries and industrial HV rails without pre-regulation. |
| Output Voltage Range | 1.25V to 13.2V (adjustable via FB pin) - enables flexible system-level rail generation including 3.3V, 5V, or custom intermediate voltages. |
| Max Output Current | 1A continuous - limited by package thermal dissipation (SO-8, qJA = 170°C/W); requires proper PCB copper area for heatsinking. |
| Quiescent Current | 270µA at no load - minimizes standby power loss in always-on automotive modules like telematics or ADAS sensors. |
| Switching Frequency | 125kHz (fixed) - balances EMI control, inductor size, and efficiency; avoids AM radio band while enabling compact magnetics. |
| Feedback Reference | 1.221V (typ) at FB pin - sets output with ±1.5% accuracy over temperature; enables precise resistor-divider design for stable regulation. |
| Shutdown Current | 10µA (typ) - ensures ultra-low leakage during system sleep modes, critical for battery-backed applications. |
Pinout & Package
MAX5035DASA/V+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and automotive-qualified (-40°C to +125°C junction). The SO package features gull-wing leads, JEDEC MS-012AC outline, and exposed pad not present (non-thermally enhanced variant).
| 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 for reliable startup and conduction. |
| VD | Internal regulator output | Supplies ~7.8V bias for gate driver and analog circuits; must be bypassed to GND with 0.1µF ceramic capacitor. |
| 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 VOUT to 1.221V reference; determines output accuracy and loop stability. |
| ON/OFF | Enable/shutdown control | Logic-level input (1.69V typ rising threshold); drives low to enter 10µA shutdown state; includes 100mV hysteresis for noise immunity. |
| GND | Power ground return | Main return path for switch current and load current; must be tied to SGND and system GND at single-point star location. |
| VIN | Main input supply | Accepts 7.5V–76V unregulated input; requires local low-ESR bulk capacitor (e.g., 68µF) placed adjacent to pin. |
| LX | Switch node | Drives external Schottky diode (e.g., 50SQ100); connects to inductor and BST capacitor; carries high dv/dt and peak currents. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side DMOS FET | 0.4Ω RDS(ON) reduces conduction loss and eliminates need for external MOSFET, lowering BOM count and layout complexity. |
| Internal frequency compensation | Eliminates external compensation network; simplifies design and improves production consistency across temperature and load conditions. |
| Pulse-skipping light-load mode | Maintains >85% efficiency at 10mA load while holding IQ at 270µA, extending battery life in intermittent-duty systems. |
| Automotive temperature grade | -40°C to +125°C operating range meets AEC-Q100 stress test requirements for under-hood and infotainment applications. |
| Hiccup-mode short-circuit protection | Auto-retries after fault clearance instead of latching off, enabling self-recovery in transient overload scenarios like motor stall or cable short. |
Applications
| Automotive Body Control Module | Industrial Sensor Node Power |
|---|---|
Use Scenario: Powering microcontrollers, CAN transceivers, and LIN interfaces in door modules or seat controllers from 12V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary buck regulator providing clean, regulated 5V or 3.3V rail with UVLO and thermal protection. Use Value: Survives 7.5V–76V input transients (load dump, jump-start), maintains regulation during cranking dips, and draws only 270µA in sleep mode. | Use Scenario: Supplying isolated sensor signal chains (e.g., pressure, temperature) in factory automation equipment with wide-input industrial supplies. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter delivering stable 12V or 5V from 24V/48V plant bus. Use Value: Delivers 90%+ efficiency at 500mA load across 24V–48V input, reducing heat buildup in sealed enclosures and eliminating need for heatsinks. |
| Railway Onboard Telematics Unit | Off-Grid Solar Charge Controller |
Use Scenario: Powering GPS, cellular modems, and data loggers in train-mounted communication systems powered by 72V nominal traction battery. IC Role / Device Role / Timing Role: Input-tolerant step-down regulator generating 5V for digital logic and 3.3V for RF sections. Use Value: Operates continuously at 76V max input, withstands railway surge standards (EN 50155), and provides hiccup-mode protection against wiring faults. | Use Scenario: Converting variable PV array output (up to 76V) into stable 12V battery charging voltage in remote solar installations. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured for constant-voltage battery charging with ON/OFF control for charge stage sequencing. Use Value: Adjustable VOUT allows precise 12.6V/13.8V/14.4V setpoints; 10µA shutdown enables deep-sleep during nighttime, minimizing parasitic drain. |
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 |
|---|---|---|---|
| LM5164QDDARQ1 | 4.5V–65V input, 1A, 100kHz–1MHz programmable frequency, requires external compensation. | Supports higher switching frequencies for smaller magnetics but lacks integrated VD regulator and fixed 125kHz simplicity. | Choose LM5164QDDARQ1 when board space is constrained and frequency tuning is needed; avoid if minimal external components are prioritized. |
| TPS54160AQPWPRQ1 | 3.5V–60V input, 1.5A, 100kHz–2.5MHz sync capability, no integrated VD rail, higher IQ (120µA). | Offers higher current and sync option but requires external bias supply and has narrower VIN range than MAX5035DASA/V+T. | Choose TPS54160AQPWPRQ1 for designs needing >1A output or synchronous rectification; use MAX5035DASA/V+T for simpler 76V-tolerant standalone buck. |
Compared with LM5164QDDARQ1 and TPS54160AQPWPRQ1, the MAX5035DASA/V+T uniquely combines 76V absolute max input, integrated VD bias rail, fixed-frequency simplicity, and automotive SO-8 packaging-making it optimal for cost-sensitive, high-reliability 1A buck applications where input voltage exceeds 60V.
Availability
MAX5035DASA/V+T is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, railway telematics, and off-grid solar charge controllers requiring stable component supply across extended temperature and high-input-voltage conditions.
Supply support for MAX5035DASA/V+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 series is part of Maxim's MAXPower™ portfolio, engineered specifically for high-input-voltage DC-DC conversion in automotive and industrial environments where reliability, wide VIN range, and minimal external components are critical.
FAQ
What is the maximum input voltage rating for the MAX5035DASA/V+T?
The MAX5035DASA/V+T has an absolute maximum input voltage rating of +80V, with guaranteed operation across 7.5V to 76V. This allows direct interface with 12V, 24V, and 48V vehicle batteries-including transient load-dump events up to 76V-without external clamping circuitry. Operation beyond 76V is not recommended for sustained use per datasheet specifications.
How do I configure the output voltage for the MAX5035DASA/V+T?
The MAX5035DASA/V+T is an adjustable-output variant requiring an external resistor divider on the FB pin. Set VOUT using R3 and R4 where VOUT = 1.221V × (1 + R3/R4); R4 should be ≤15kΩ. For example, 5V output uses R4 = 13.3kΩ and R3 = 41.2kΩ. The MAX5035DASA/V+T's 1.221V feedback reference ensures tight regulation across temperature and line/load variations.
Does the MAX5035DASA/V+T require an external Schottky diode?
Yes, the MAX5035DASA/V+T requires an external Schottky freewheeling diode (e.g., 50SQ100) connected between LX and GND. This diode handles inductor current during the high-side switch off-time. The MAX5035DASA/V+T does not integrate a synchronous rectifier, so selecting a low-VF (<0.45V), high-voltage-rated Schottky is essential to prevent body-diode conduction and thermal runaway.
What is the purpose of the VD pin on the MAX5035DASA/V+T?
VD is the output of an internal linear regulator that supplies ~7.8V to power the gate driver and analog circuitry. It must be bypassed to GND with a 0.1µF ceramic capacitor. Unlike the main output, VD is not intended for external loads-it exists solely to ensure stable internal biasing across the full 7.5V–76V input range, eliminating need for auxiliary LDOs in the MAX5035DASA/V+T design.
Is the MAX5035DASA/V+T qualified for automotive applications?
Yes, the MAX5035DASA/V+T is explicitly automotive-qualified: the "/V+" suffix denotes AEC-Q100 compliance, and it operates across -40°C to +125°C junction temperature. Its design includes undervoltage lockout, thermal shutdown, hiccup-mode short-circuit protection, and robust ESD tolerance-all validated for under-hood and chassis-mounted automotive subsystems.
MAX5035DASA/V+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:
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX5035DASA/V+T FAQ
1.How can I place an order for MAX5035DASA/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035DASA/V+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 MAX5035DASA/V+T reliable?
The price and inventory of MAX5035DASA/V+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035DASA/V+T is usually 5 days.
3.What payment methods are accepted for MAX5035DASA/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035DASA/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035DASA/V+T?
MAX5035DASA/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035DASA/V+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 MAX5035DASA/V+T?
For technical support, including MAX5035DASA/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035DASA/V+T requirements.
6.How does Aetrix verify that MAX5035DASA/V+T is sourced from the original manufacturer or authorized distributors?
All MAX5035DASA/V+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 MAX5035DASA/V+T meets industry standards.
7.What is the process for return or replacement of MAX5035DASA/V+T?
All MAX5035DASA/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035DASA/V+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 MAX5035DASA/V+T part is unused and in its original packaging.
Return procedure for MAX5035DASA/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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