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Analog Devices Inc./Maxim Integrated MAX5035AUSA+
- Part No.:
- MAX5035AUSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5035AUSA+.pdf
- Description:
- IC REG BUCK 3.3V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:279
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Product details
Overview
The MAX5035AUSA+ 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 pulse-skipping mode for light-load efficiency. Used in automotive power supplies where wide VIN and low IQ are critical.
For engineers reviewing the MAX5035AUSA+ datasheet, MAX5035AUSA+ pinout, MAX5035AUSA+ application, or MAX5035AUSA+ equivalent, this page delivers verified technical context, package-specific design meaning, real-world application constraints, and validated alternative options - all grounded in the official MAX5035A datasheet (Rev 5, May 2011) and Maxim's published electrical characteristics for the A-version in SO package.
Technical Context
This voltage-mode buck regulator uses internal voltage feed-forward control and an integrated high-side N-channel DMOS switch to maintain stable regulation across its 7.5V–76V input range. Its fixed 125kHz PWM operation transitions automatically to pulse-skipping mode below ~85mA load to sustain high efficiency and ultra-low 270µA no-load IQ.
The device implements comprehensive protection: undervoltage lockout (UVLO = 5.2V typ), cycle-by-cycle current limit (ILIM = 1.9A typ), hiccup-mode short-circuit response, and thermal shutdown at +160°C with +20°C hysteresis. The FB pin regulates to 1.221V (typ), enabling precise 3.3V output via direct connection to VOUT in fixed-output variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports wide industrial and automotive battery rails including 24V, 48V, and 72V systems without external pre-regulation. |
| Output Voltage | 3.3V ±3.5% (3.185V–3.415V) - tightly regulated fixed output suitable for powering microcontrollers, sensors, and interface ICs. |
| Max Output Current | 1A continuous - limited by thermal dissipation in the 8-pin SO package (qJA = 170°C/W); derates above +70°C ambient. |
| Quiescent Current | 270µA (typ) at no load - enables long battery life in always-on automotive modules and remote IoT nodes. |
| Switching Frequency | 125kHz (109–137kHz over temp) - balances EMI, inductor size, and efficiency; fixed-frequency simplifies EMI filtering. |
| Internal High-Side RDS(ON) | 0.4Ω (typ) - reduces conduction loss and eliminates need for external MOSFET, lowering BOM count and PCB area. |
| Shutdown Current | 10µA (typ) - ensures near-zero power draw during system sleep modes. |
Pinout & Package
MAX5035AUSA+ is housed in an 8-pin SO (Small Outline) package with gull-wing leads, JEDEC MS-012AC compliant, rated for 0°C to +85°C operation. Thermal resistance θJA = 170°C/W; recommended PCB copper pour under exposed pad (if present) improves heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BST | Bootstrap capacitor node | Connects 0.1µF ceramic cap to LX; provides gate drive voltage for internal high-side DMOS switch - critical for proper startup and PWM operation. |
| 2 - VD | Internal regulator output | Supplies ~7.8V bias for internal circuitry; must be bypassed to GND with 0.1µF ceramic cap - failure causes erratic switching or latch-up. |
| 3 - SGND | Signal ground reference | Internal analog ground node; must be connected directly to system GND plane - not isolated; improper routing causes feedback instability. |
| 4 - FB | Feedback input | Senses output voltage; for MAX5035A, connect directly to VOUT - sets 3.3V regulation via internal 1.221V reference; open-circuit disables regulation. |
| 5 - ON/OFF | Enable/shutdown control | Logic-level input; ≥1.69V (typ) enables operation; ≤1.53V disables - used for system-level power sequencing and fault recovery. |
| 6 - GND | Power ground | Main return path for high-current LX switching; must tie to SGND and input/output capacitor grounds at a single star point to minimize noise coupling. |
| 7 - VIN | Main input supply | Accepts 7.5V–76V; requires low-ESR input capacitor (e.g., 68µF aluminum + 0.1µF ceramic) placed adjacent to pin - ripple current handling is critical. |
| 8 - LX | Switch node | Drives external inductor; connects internally to high-side DMOS drain - high dv/dt node requiring tight layout and minimal trace length to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Internal frequency compensation | Eliminates need for external compensation network - reduces design risk and component count while ensuring stable loop response across temperature and load. |
| Pulse-skipping light-load mode | Maintains >80% efficiency down to ~1mA load - avoids linear regulator inefficiency while preserving low-noise output for sensitive analog circuits. |
| Hiccup-mode short-circuit protection | Shuts down and auto-restarts on sustained overload - prevents thermal runaway and allows safe recovery without manual reset or external circuitry. |
| Integrated 0.4Ω high-side DMOS | Enables complete 1A buck solution with only 5 external components (inductor, diode, input/output caps, BST cap) - lowers total solution cost and footprint. |
| Automotive-grade temperature range option | MAX5035AASA/V+ variant available for -40°C to +125°C - same pinout and electrical specs, qualified per AEC-Q100 for engine bay and ADAS applications. |
Applications
| Automotive Body Control Module (BCM) | Industrial Programmable Logic Controller (PLC) I/O Power |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interfaces in vehicle door modules and lighting controllers using 12V/24V battery rail. IC Role / Device Role / Timing Role: Primary 3.3V point-of-load regulator delivering clean, stable voltage despite cold-crank (6.5V) and load-dump (60V+) transients. Use Value: 76V absolute max rating and UVLO threshold of 5.2V ensure reliable startup and operation across full automotive voltage envelope without external protection. |
Use Scenario: Supplies 3.3V logic power to digital I/O isolators and fieldbus interface ICs in DIN-rail mounted PLC backplanes. IC Role / Device Role / Timing Role: Isolated secondary-side buck converter fed from 24V or 48V industrial supply, providing noise-immune logic rail. Use Value: 270µA quiescent current minimizes standby losses in energy-sensitive factory automation systems with frequent sleep/wake cycles. |
| Railway Signaling Power Supply | Telecom Remote Radio Unit (RRU) Bias Supply |
Use Scenario: Generates 3.3V for FPGA configuration and monitoring MCU in trackside signaling equipment powered from 72V DC traction supply. IC Role / Device Role / Timing Role: High-input-voltage DC-DC stage converting unregulated 48–96V nominal rail to low-noise 3.3V under harsh EMI and thermal conditions. Use Value: Fixed 125kHz switching frequency enables predictable EMI filtering; thermal shutdown at +160°C protects against enclosure overheating in sealed enclosures. |
Use Scenario: Provides auxiliary 3.3V bias for RF front-end control logic and ADCs in outdoor 4G/5G RRUs powered from 48V telecom plant. IC Role / Device Role / Timing Role: Efficient intermediate-stage regulator stepping down 48V to 3.3V with minimal heat generation in thermally constrained RF enclosures. Use Value: 94% peak efficiency at 24V→3.3V/0.5A reduces thermal load on heatsink; 10µA shutdown current supports deep-sleep power states. |
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 2.5MHz switching frequency; 75V max VIN; 0.5A output; requires external compensation. | Better suited for space-constrained designs needing smaller magnetics; lower output current limits use cases requiring >0.5A. | Select LM5008AMM/NOPB when board area is critical and load < 0.5A; avoid if 1A continuous output or 76V tolerance is required. |
| TPS54360DGQ | 60V max VIN; 3.5A output; adjustable frequency (100kHz–2.5MHz); integrated soft-start; no internal bootstrap diode. | Higher current capability and programmability suit dynamic loads; 60V VIN ceiling excludes 72V railway or heavy-duty truck applications. | Choose TPS54360DGQ for higher-current industrial systems with VIN ≤ 60V; MAX5035AUSA+ remains preferred for 76V compliance and lower IQ. |
Compared with LM5008AMM/NOPB and TPS54360DGQ, the MAX5035AUSA+ uniquely combines 76V input tolerance, 1A output, and 270µA quiescent current in an 8-pin SO package - making it optimal for automotive and railway applications where input voltage margin and standby power are non-negotiable.
Availability
MAX5035AUSA+ is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power rails, railway signaling systems, and telecom remote radio units requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX5035AUSA+ 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 belongs to Maxim's MAXPower™ high-voltage DC-DC converter family, engineered specifically for robust, high-efficiency power conversion in environments with wide input voltage ranges and stringent reliability requirements.
FAQ
What is the maximum input voltage the MAX5035AUSA+ can withstand?
The MAX5035AUSA+ has an absolute maximum input voltage rating of +80V, with operational specification up to +76V. It is designed for automotive and industrial applications where transient overvoltages (e.g., load dump) occur. Sustained operation above 76V risks permanent damage, and the internal UVLO ensures startup only above 5.2V (typ), preventing brownout behavior.
Does the MAX5035AUSA+ require external compensation components?
No, the MAX5035AUSA+ features internal frequency compensation optimized for stability with standard external components. This eliminates the need for external RC networks on the COMP or FB pins, reducing design complexity and improving consistency across production units - a key advantage over many competing controllers like the LM5008.
How does the MAX5035AUSA+ achieve high efficiency at light loads?
The MAX5035AUSA+ automatically enters pulse-skipping mode below ~85mA output current, disabling switching cycles when output voltage is within regulation. This reduces switching losses and maintains >80% efficiency down to milliamp loads, unlike fixed-frequency converters that suffer steep efficiency drop-offs - critical for battery-backed or always-on systems.
What is the purpose of the BST pin on the MAX5035AUSA+?
The BST (bootstrap) pin on the MAX5035AUSA+ provides gate-drive voltage for the internal high-side DMOS transistor. A 0.1µF ceramic capacitor must be connected between BST and LX. During startup, an internal low-side switch charges this capacitor from the VD rail; thereafter, it self-refreshes each switching cycle to sustain the gate voltage needed for efficient high-side conduction.
Can the MAX5035AUSA+ be used in automotive under-hood applications?
The MAX5035AUSA+ is rated for 0°C to +85°C ambient, making it suitable for cabin and trunk-mounted automotive electronics. For under-hood use (e.g., engine control), select the MAX5035AASA/V+, which is AEC-Q100 qualified and specified for -40°C to +125°C junction temperature - same pinout and electrical performance, but with extended thermal and reliability validation.
MAX5035AUSA+ 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:
- 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:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX5035AUSA+ FAQ
1.How can I place an order for MAX5035AUSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035AUSA+ 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 MAX5035AUSA+ reliable?
The price and inventory of MAX5035AUSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035AUSA+ is usually 5 days.
3.What payment methods are accepted for MAX5035AUSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035AUSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035AUSA+?
MAX5035AUSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035AUSA+ 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 MAX5035AUSA+?
For technical support, including MAX5035AUSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035AUSA+ requirements.
6.How does Aetrix verify that MAX5035AUSA+ is sourced from the original manufacturer or authorized distributors?
All MAX5035AUSA+ 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 MAX5035AUSA+ meets industry standards.
7.What is the process for return or replacement of MAX5035AUSA+?
All MAX5035AUSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035AUSA+, 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 MAX5035AUSA+ part is unused and in its original packaging.
Return procedure for MAX5035AUSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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