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Analog Devices Inc./Maxim Integrated MAX5035DUPA+
- Part No.:
- MAX5035DUPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX5035DUPA+.pdf
- Description:
- IC REG BUCK ADJ 1A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,874
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Product details
Overview
The MAX5035DUPA+ from Maxim Integrated is a high-voltage, adjustable-output, pulse-width modulated (PWM) step-down DC-DC converter designed for automotive and industrial power supplies. It operates from 7.5V to 76V input, delivers up to 1A output current, features 125kHz fixed switching frequency with pulse-skipping mode, and includes internal 0.4Ω high-side DMOS FET and thermal shutdown - enabling robust 12V/5V rail generation in vehicle infotainment systems.
For engineers reviewing the MAX5035DUPA+ datasheet, MAX5035DUPA+ pinout, MAX5035DUPA+ application, or MAX5035DUPA+ equivalent, key selection criteria include its adjustable 1.25V–13.2V output range, 270µA no-load quiescent current, automotive-grade –40°C to +125°C operation, and SO-8 package compatibility with space-constrained PCB layouts.
Technical Context
This voltage-mode buck regulator uses internal voltage feed-forward control and integrated high-side DMOS switching to maintain >90% efficiency across wide VIN ranges (e.g., 12V–48V inputs). Its fixed 125kHz oscillator enables predictable EMI filtering, while automatic transition to pulse-skipping mode below ~85mA load preserves efficiency at light loads without external compensation components.
The device integrates dual regulation paths: a dedicated 7.8V internal VD regulator powers gate drive and analog circuitry, and a precision 1.221V feedback reference (±1.5% over temperature) enables accurate output setting via external resistor divider. Protection includes cycle-by-cycle current limiting (1.9A typ), hiccup-mode short-circuit response, and thermal shutdown at +160°C with +20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports direct connection to 24V/48V industrial buses and 12V automotive batteries with cold-crank margin. |
| Output Voltage Range | Adjustable 1.25V to 13.2V - set via external resistor divider; FB pin regulated at 1.221V ±1.5% over temperature. |
| Max Output Current | 1A continuous - limited by thermal dissipation in 8-pin PDIP package (727mW @ TA=70°C, qJA=110°C/W). |
| Quiescent Current | 270µA at no load - enables always-on subsystems (e.g., CAN wake-up receivers) without excessive battery drain. |
| Switching Frequency | Fixed 125kHz (105–137kHz over temp) - simplifies EMI filter design and avoids AM radio band interference. |
| Internal High-Side FET | 0.4Ω RDS(ON) - reduces conduction loss and eliminates need for external MOSFET in most 1A applications. |
| Shutdown Current | 10µA typical - ensures ultra-low standby power when ON/OFF pin is pulled low. |
Pinout & Package
MAX5035DUPA+ is housed in an 8-pin plastic DIP (PDIP) package with through-hole mounting and JEDEC-standard footprint. Thermal resistance is 110°C/W (junction-to-ambient), requiring minimal copper pour for automotive ambient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 1) | Bootstrap capacitor connection | Connects 0.1µF ceramic cap between BST and LX to generate gate drive voltage for internal high-side DMOS switch. |
| VD (Pin 2) | Internal regulator output | Provides 7.8V ±0.5V bias for gate driver and analog circuits; bypass with 0.1µF ceramic to GND. |
| SGND (Pin 3) | Signal ground reference | Internal analog ground node; must be connected directly to system GND plane to avoid feedback error. |
| FB (Pin 4) | Feedback sense input | Monitors output via resistive divider; regulates VOUT to 1.221V at FB - sets output as VOUT = 1.221 × (1 + R3/R4). |
| ON/OFF (Pin 5) | Enable/shutdown control | Logic-level input: <1.53V = shutdown (10µA IQ), >1.85V = active; 100mV hysteresis prevents chatter near threshold. |
| GND (Pin 6) | Power ground return | Main return path for high-current LX switching and VD regulator; connect to SGND at single-point star ground. |
| VIN (Pin 7) | Main input supply | Accepts 7.5V–76V; requires local low-ESR bulk capacitor (e.g., 68µF aluminum + 0.1µF ceramic) within 5mm. |
| LX (Pin 8) | Switch node | Drives external Schottky diode (e.g., 50SQ100) and inductor; high dv/dt node - minimize trace length and loop area. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-voltage DMOS switch | 0.4Ω RDS(ON) enables compact 1A buck designs without external MOSFET or driver IC. |
| Internal frequency compensation | Eliminates external compensation network - reduces BOM count and layout sensitivity for stable 125kHz operation. |
| Pulse-skipping light-load mode | Maintains >85% efficiency down to 10mA load, critical for automotive modules with variable duty cycles. |
| Automotive temperature grade | –40°C to +125°C operation with guaranteed specs - qualified per AEC-Q100 stress test requirements. |
| Hiccup-mode short-circuit protection | Auto-retries after fault clearance instead of latching off - prevents thermal runaway during sustained overload. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Powering microcontrollers, CAN transceivers, and sensor interfaces in door modules and seat controllers. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator converting 12V battery to logic rails with cold-crank tolerance. Use Value: 76V absolute max rating withstands load-dump transients; 270µA quiescent current extends battery life during sleep mode. | Use Scenario: Generating isolated 12V auxiliary supply for analog input conditioning and digital isolators in modular I/O cards. IC Role / Device Role / Timing Role: High-input-voltage buck stage feeding downstream LDOs or isolated DC-DC converters. Use Value: Adjustable output allows flexible rail assignment (e.g., 12V for op-amps, 5V for FPGA configuration); 125kHz switching eases compliance with industrial EMC standards. |
| Railway Signaling Power | Off-Highway Vehicle Telematics |
Use Scenario: Converting 72V nominal traction battery to 5V for GPS, cellular modems, and display controllers in train control units. IC Role / Device Role / Timing Role: Primary non-isolated DC-DC stage handling wide input variation (40V–100V) and high ambient temperature. Use Value: 1A output sustains modem burst transmission; thermal shutdown at +160°C prevents failure in sealed enclosures. | Use Scenario: Powering ruggedized displays and wireless gateways in construction equipment with 24V/48V chassis batteries. IC Role / Device Role / Timing Role: Main power supply for embedded Linux gateway with multiple USB peripherals and Wi-Fi radios. Use Value: Pulse-skipping mode maintains >88% efficiency at 50mA idle current; PDIP package allows manual rework in field-service environments. |
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 |
|---|---|---|---|
| LM5017MM/NOPB | Fixed 5V/12V variants only; no adjustable version; 100V max input; 600mA output; requires external compensation. | Suitable for fixed-rail designs where 1A is not required; lacks automotive temp grade (–40°C to +125°C). | Select LM5017MM/NOPB only if output voltage is fixed and thermal budget permits lower current. |
| TPS54360DGQR | Adjustable output (0.8V–60V); 3.5A output; 100V max input; 2.97V–60V input range; no integrated VD regulator. | Better for higher-current applications; requires external bias supply; wider VIN but narrower low-end range than MAX5035DUPA+. | Choose TPS54360DGQR when >1A output or sub-7.5V start-up is needed; verify VD rail sourcing. |
Compared with LM5017MM/NOPB and TPS54360DGQR, the MAX5035DUPA+ uniquely combines adjustable 1.25V–13.2V output, true 76V operation, integrated VD bias, and automotive qualification in an 8-pin PDIP - making it optimal for cost-sensitive, thermally constrained 1A automotive body electronics.
Availability
MAX5035DUPA+ is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O power supplies, railway signaling systems, and off-highway telematics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX5035DUPA+ 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 industrial, automotive, and communications applications.
The MAX5035 product line delivers high-efficiency, high-voltage DC-DC conversion for automotive and industrial power systems where input transients, wide temperature operation, and low quiescent current are critical.
FAQ
What is the maximum input voltage rating for the MAX5035DUPA+?
The MAX5035DUPA+ has an absolute maximum input voltage rating of +80V, with recommended continuous operation up to +76V. This allows reliable use in 24V and 48V industrial systems and automotive applications subject to load-dump transients. Operation above 76V is not advised for long-term reliability, even though the device may survive brief excursions to 80V per absolute maximum ratings.
Does the MAX5035DUPA+ require external compensation components?
No, the MAX5035DUPA+ includes internal frequency compensation optimized for stability with standard output filter configurations. This eliminates the need for external Type II or Type III compensation networks, reducing component count and layout complexity. The internal compensation is specifically tuned for the 125kHz switching frequency and typical LC filter values used with this device.
How is the output voltage set on the MAX5035DUPA+?
The MAX5035DUPA+ uses an external resistive voltage divider connected from VOUT to GND, with the midpoint fed into the FB pin. The device regulates FB to 1.221V, so VOUT = 1.221 × (1 + R3/R4). For example, using R4 = 13.3kΩ and R3 = 41.2kΩ yields VOUT ≈ 5.0V. R4 should be ≤15kΩ to minimize noise sensitivity and ensure proper bias current.
What type of external diode is required for the MAX5035DUPA+?
The MAX5035DUPA+ requires an external Schottky rectifier such as the 50SQ100 (76V, 5A) or equivalent. Key requirements include: reverse voltage rating ≥76V, forward voltage ≤0.45V at max load, and continuous current rating ≥1A. Low forward-voltage Schottky diodes are mandatory to prevent conduction through the internal body diode and avoid thermal shutdown.
Is the MAX5035DUPA+ qualified for automotive applications?
Yes, the MAX5035DUPA+ is automotive-qualified with operation over –40°C to +125°C and compliance with AEC-Q100 stress testing requirements. The "/V+" suffix denotes automotive qualification and RoHS-compliance. Its undervoltage lockout, thermal shutdown, and hiccup-mode protection are specifically designed for harsh automotive environments including start-stop and load-dump conditions.
MAX5035DUPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX5035DUPA+ FAQ
1.How can I place an order for MAX5035DUPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035DUPA+ 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 MAX5035DUPA+ reliable?
The price and inventory of MAX5035DUPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035DUPA+ is usually 5 days.
3.What payment methods are accepted for MAX5035DUPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035DUPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035DUPA+?
MAX5035DUPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035DUPA+ 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 MAX5035DUPA+?
For technical support, including MAX5035DUPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035DUPA+ requirements.
6.How does Aetrix verify that MAX5035DUPA+ is sourced from the original manufacturer or authorized distributors?
All MAX5035DUPA+ 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 MAX5035DUPA+ meets industry standards.
7.What is the process for return or replacement of MAX5035DUPA+?
All MAX5035DUPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035DUPA+, 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 MAX5035DUPA+ part is unused and in its original packaging.
Return procedure for MAX5035DUPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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