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Analog Devices Inc./Maxim Integrated MAX5035CUSA+
- Part No.:
- MAX5035CUSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5035CUSA+.pdf
- Description:
- IC REG BUCK 12V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:201
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Product details
Overview
The MAX5035CUSA+ from Maxim Integrated is a high-voltage, 12V fixed-output, step-down DC-DC converter IC operating from 15V to 76V input, delivering up to 1A output current with 94% peak efficiency at 24VIN/0.5A, 270µA no-load quiescent current, and integrated 0.4Ω high-side DMOS FET - designed for automotive power conversion in engine control units and battery management systems.
For engineers reviewing the MAX5035CUSA+ datasheet, MAX5035CUSA+ pinout, MAX5035CUSA+ application, or MAX5035CUSA+ equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade thermal behavior (−40°C to +125°C), and real-world substitution guidance for high-input-voltage buck regulation.
Technical Context
The MAX5035CUSA+ implements voltage-mode PWM control with feed-forward compensation and internal frequency compensation, enabling stable operation across its full 15V–76V input range without external loop components. It uses an integrated high-voltage N-channel DMOS switch and bootstrap gate drive (BST pin) to sustain 125kHz fixed-frequency switching or pulse-skipping mode at light loads.
It integrates undervoltage lockout (5.2V typ), cycle-by-cycle current limiting (1.9A typ), hiccup-mode short-circuit protection, and thermal shutdown at +160°C with +20°C hysteresis. The device features dedicated VD regulator output (7.8V typ) for gate drive and analog circuitry, and supports external UVLO programming via ON/OFF pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 15V to 76V - enables direct connection to 24V/48V industrial buses and automotive 12V/24V systems with transient tolerance up to +80V. |
| Output Voltage | Fixed 12V ±3% (11.64V–12.42V) - tightly regulated for powering microcontrollers, sensors, and CAN transceivers without external feedback resistors. |
| Max Output Current | 1A continuous - limited by package thermal dissipation (471mW @ +70°C in SO-8), not just switch capability. |
| Switching Frequency | 125kHz (109–137kHz) - balances EMI control, inductor size, and efficiency; fixed PWM with automatic PFM transition below ~85mA load. |
| Quiescent Current | 270µA (typ) at no load - ensures low standby power in always-on automotive modules such as telematics and ADAS domain controllers. |
| Shutdown Current | 10µA (typ) - allows deep-sleep operation when ON/OFF pin is pulled low, critical for battery-backed systems. |
| Thermal Shutdown | +160°C junction temperature with +20°C hysteresis - provides robust fault recovery in enclosed under-hood environments. |
Pinout & Package
MAX5035CUSA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free (+ suffix), rated for −40°C to +125°C operation. The package features exposed pad thermal enhancement per JEDEC 51 standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor connection | Connects 0.1µF ceramic cap between BST and LX to generate gate drive voltage for internal high-side DMOS switch. |
| VD | Internal regulator output | Provides ~7.8V regulated supply for internal logic and gate driver; 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 to maintain feedback accuracy and noise immunity. |
| FB | Feedback sense input | Internally tied to 12V output; no external divider required - simplifies layout and eliminates resistor tolerance errors. |
| ON/OFF | Enable/shutdown control | Logic-level input (1.69V typ rising threshold); pull low to reduce supply current to 10µA and disable switching. |
| GND | Power ground return | Main power return path for LX current and internal regulator; connect to star ground point near input/output capacitors. |
| VIN | Main input supply | Accepts 15V–76V DC; requires local low-ESR input capacitor (e.g., 68µF aluminum + 0.1µF ceramic) placed adjacent to pin. |
| LX | Switch node | Drain of internal high-side DMOS; connects to external Schottky diode cathode and inductor; carries high dv/dt switching waveform. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.4Ω high-side DMOS FET | Reduces BOM count and PCB area while maintaining >94% efficiency at 24VIN/0.5A - eliminates need for external MOSFET and driver. |
| Internal frequency compensation | Enables stable closed-loop operation with only two external components (inductor + output capacitor), avoiding complex Type II/III compensation networks. |
| Automotive temperature grade (−40°C to +125°C) | Qualified per AEC-Q100 stress test requirements - suitable for under-hood applications including engine control, transmission control, and ADAS power rails. |
| Pulse-skipping mode at light loads | Maintains >80% efficiency down to 10mA load while holding quiescent current at 270µA - essential for always-on vehicle networks. |
| Hiccup-mode short-circuit protection | Prevents thermal runaway during sustained output shorts by cycling on/off until fault clears - protects both IC and external components. |
Applications
| Engine Control Unit (ECU) Power Supply | Industrial 48V DC Bus Converter |
|---|---|
|
Use Scenario: Powers 12V microcontroller, CAN transceiver, and sensor interface circuits from a noisy 48V truck battery bus with load dumps up to +76V. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing clean, regulated 12V rail with fast transient response to injector driver switching. Use Value: Withstands 76V transients and maintains <±3% output regulation across −40°C to +125°C - eliminates need for upstream TVS clamping or pre-regulator stages. |
Use Scenario: Converts 48V factory automation bus to 12V for PLC I/O modules and fieldbus gateways operating in uncooled enclosures. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC-DC stage replacing discrete buck controllers and external MOSFETs. Use Value: Delivers 1A at 94% efficiency with 471mW max dissipation in SO-8 - enables convection-only cooling in space-constrained DIN-rail mounts. |
| Automotive Telematics Power Management | Off-Highway Equipment Battery Monitor |
|
Use Scenario: Supplies 12V to LTE modem, GNSS receiver, and secure MCU in always-on telematics control unit powered by vehicle battery (9V–16V nominal, up to 76V during jump-start). IC Role / Device Role / Timing Role: Low-quiescent-current buck regulator enabling <270µA sleep mode while retaining fast wake-up capability via ON/OFF pin. Use Value: 10µA shutdown current extends battery life during vehicle parking; 400µs soft-start prevents inrush-induced brownouts on shared 12V rail. |
Use Scenario: Powers battery monitoring ICs and isolated RS-485 transceivers in construction equipment where input voltage ranges from 12V (engine off) to 76V (alternator surge). IC Role / Device Role / Timing Role: Robust front-end regulator ensuring stable 12V supply despite wide VIN variation and harsh EMI environment. Use Value: Integrated UVLO (5.2V) and thermal shutdown (+160°C) prevent latch-up during cold cranking or hydraulic pump motor startup surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDDARQ1 | 4.5V–65V input, 1A, 1.5MHz switching, requires external MOSFETs and compensation network. | Higher frequency enables smaller magnetics but increases EMI filtering complexity; lacks integrated VD regulator. | Choose LM5164QDDARQ1 when board space is constrained and higher switching frequency is acceptable; avoid if minimizing design validation effort is priority. |
| TPS54160AQPWPRQ1 | 3.5V–60V input, 1.5A, 100kHz–2.5MHz programmable frequency, integrated compensation, but no VD rail. | Lower max input voltage (60V vs. 76V) limits use in 72V battery systems; wider frequency range aids EMI tuning. | Choose TPS54160AQPWPRQ1 for designs requiring adjustable frequency or higher output current; verify 60V absolute max rating suffices for your surge profile. |
Compared with LM5164QDDARQ1 and TPS54160AQPWPRQ1, the MAX5035CUSA+ offers superior input voltage margin (76V), integrated gate-drive regulator (VD), and simpler layout due to internal compensation - making it optimal for cost-sensitive, thermally demanding automotive and industrial 12V rail generation where reliability trumps frequency flexibility.
Availability
MAX5035CUSA+ is available at Aetrix Electronics and suitable for automotive power supplies, industrial 48V DC-DC conversion, and off-highway battery monitoring systems requiring stable component supply across extended temperature and high-voltage stress conditions.
Supply support for MAX5035CUSA+ 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 automotive, industrial, and communications markets - emphasizing high-reliability, high-performance, and integration density.
The MAX5035CUSA+ belongs to the MAXPower™ family of high-input-voltage DC-DC converters, engineered specifically for automotive and industrial applications where wide VIN range, high efficiency at light loads, and AEC-Q100 qualification are mandatory.
FAQ
What is the maximum input voltage rating for the MAX5035CUSA+?
The MAX5035CUSA+ has an absolute maximum input voltage rating of +80V, with guaranteed operational range from 15V to 76V. This allows safe operation in automotive environments subject to load dump transients up to ISO 7637-2 Pulse 5a (76V/400ms). Exceeding +80V risks permanent damage per the Absolute Maximum Ratings table.
Does the MAX5035CUSA+ require external feedback resistors to set the output voltage?
No, the MAX5035CUSA+ does not require external feedback resistors. As a fixed 12V version, its FB pin is internally connected to the regulated output; users simply tie FB directly to VOUT. This eliminates resistor tolerance errors and improves long-term output stability over temperature and time.
How does the MAX5035CUSA+ handle thermal overload conditions?
The MAX5035CUSA+ features integrated thermal shutdown that activates at +160°C junction temperature, turning off the internal DMOS switch. After cooling to +140°C (20°C hysteresis), it automatically resumes operation in hiccup mode - cycling on/off until the fault condition is removed. This protects both the IC and downstream circuitry during sustained overload.
Can the MAX5035CUSA+ be used with a 7.5V input supply?
No, the MAX5035CUSA+ is not specified for 7.5V input operation. Its minimum input voltage is 15V, as stated in the Electrical Characteristics table for the "C" variant. Attempting to operate below 15V will cause undervoltage lockout and prevent regulation - use MAX5035AUSA+ (3.3V, 7.5V min) or MAX5035BUSA+ (5V, 7.5V min) for lower VIN applications.
What external components are mandatory for basic operation of the MAX5035CUSA+?
Four external components are mandatory: (1) 0.1µF ceramic capacitor between BST and LX, (2) 0.1µF ceramic capacitor from VD to GND, (3) Schottky freewheeling diode (e.g., 50SQ100), and (4) output inductor (e.g., 220µH for 12V/1A). Input and output bulk capacitors are also required but value selection depends on ripple and transient requirements.
MAX5035CUSA+ 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:
- Not For New Designs
- 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):
- 12V
- 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
MAX5035CUSA+ FAQ
1.How can I place an order for MAX5035CUSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035CUSA+ 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 MAX5035CUSA+ reliable?
The price and inventory of MAX5035CUSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035CUSA+ is usually 5 days.
3.What payment methods are accepted for MAX5035CUSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035CUSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035CUSA+?
MAX5035CUSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035CUSA+ 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 MAX5035CUSA+?
For technical support, including MAX5035CUSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035CUSA+ requirements.
6.How does Aetrix verify that MAX5035CUSA+ is sourced from the original manufacturer or authorized distributors?
All MAX5035CUSA+ 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 MAX5035CUSA+ meets industry standards.
7.What is the process for return or replacement of MAX5035CUSA+?
All MAX5035CUSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035CUSA+, 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 MAX5035CUSA+ part is unused and in its original packaging.
Return procedure for MAX5035CUSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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