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Analog Devices Inc./Maxim Integrated MAX5035BUSA
- Part No.:
- MAX5035BUSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5035BUSA.pdf
- Description:
- IC REG BUCK 5V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,472
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Product details
Overview
The MAX5035BUSA from Maxim Integrated is a high-voltage, 1A step-down DC-DC converter with fixed 5.0V output, operating from 7.5V to 76V input and delivering up to 90% efficiency at 12VIN/0.5AOUT. 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-input, high-reliability regulation is required.
For engineers reviewing the MAX5035BUSA datasheet, MAX5035BUSA pinout, MAX5035BUSA application, or MAX5035BUSA equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications across -40°C to +125°C automotive grade variants, and real-world design constraints including BST capacitor routing, ON/OFF threshold hysteresis, and VD regulator load limits.
Technical Context
The MAX5035BUSA implements voltage-mode PWM control with feed-forward compensation, enabling stable regulation across its full 7.5–76V input range without external loop compensation components. Its internal 0.4Ω high-side DMOS switch and integrated gate driver (BST/LX bootstrap architecture) eliminate external MOSFETs and reduce BOM count.
It features dual protection modes: hiccup-mode short-circuit response triggered by cycle-by-cycle current limiting (ILIM = 1.3–2.5A), and thermal shutdown at +160°C with +20°C hysteresis. Undervoltage lockout activates at 5.2V (typ) on VIN, while programmable UVLO via ON/OFF pin supports custom start-up thresholds.
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/24V automotive batteries with headroom for load dump transients. |
| Output Voltage | Fixed 5.0V ±2.5% (4.825V–5.175V) - tightly regulated for powering microcontrollers, sensors, and logic interfaces without external feedback resistors. |
| Max Output Current | 1A continuous - limited by package thermal resistance (SO-8: θJA = 170°C/W) and internal current limit (1.3–2.5A peak). |
| Quiescent Current | 270µA (typ) at no load - enables always-on systems like CAN nodes or telematics modules with minimal standby drain. |
| Shutdown Current | 10µA (typ) - allows deep-sleep operation with external enable control via ON/OFF pin (1.69V rising threshold, 100mV hysteresis). |
| Switching Frequency | 125kHz (105–137kHz over temp) - balances EMI performance and inductor size; fixed-frequency PWM avoids subharmonic instability. |
| Internal FET RDS(ON) | 0.4Ω (typ) - reduces conduction loss and eliminates need for external high-voltage MOSFET in compact designs. |
Pinout & Package
MAX5035BUSA is housed in an 8-pin SO (Small Outline) package compliant with JEDEC MS-012, rated for 0°C to +85°C ambient operation. The package includes exposed pad thermal enhancement per manufacturer layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor connection | Drives high-side DMOS gate; requires 0.1µF ceramic cap between BST and LX to sustain >76V operation. |
| VD | Internal regulator output | Provides ~7.8V bias for internal circuitry; 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 avoid noise coupling. |
| FB | Feedback sense input | Internally tied to 5.0V output; no external divider needed for MAX5035BUSA - simplifies layout and improves stability. |
| ON/OFF | Enable/shutdown control | Logic-level input: <1.5V = shutdown (10µA ISHDN), >1.85V = active; 100mV hysteresis prevents chatter during slow-rising inputs. |
| GND | Power ground return | Main power return path for LX switch and internal regulators; must connect to low-impedance ground plane near SGND. |
| VIN | Main input supply | Accepts 7.5–76V; requires local low-ESR bulk capacitor (e.g., 68µF aluminum + 0.1µF ceramic) placed adjacent to pin. |
| LX | Switch node | Drains high-side DMOS source; connects to external Schottky diode cathode and inductor; critical for EMI and thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-voltage DMOS switch | Eliminates external MOSFET and driver, reducing solution size and component count for 76V input applications. |
| Internal frequency compensation | Enables stable closed-loop operation with only two external components (inductor + output capacitor) - no compensation network required. |
| Pulse-skipping light-load mode | Maintains >85% efficiency down to 1mA load, critical for battery-backed or energy-harvesting systems with variable duty cycles. |
| Hiccup-mode short-circuit protection | Prevents thermal runaway during sustained overload by cycling ON/OFF; limits average power dissipation during fault conditions. |
| Automotive-grade temperature range | SO-8 variant MAX5035BASA supports -40°C to +125°C junction; MAX5035BUSA qualifies for commercial 0°C to +85°C ambient use. |
Applications
| Automotive Body Control Module (BCM) | Industrial Programmable Logic Controller (PLC) I/O Power |
|---|---|
Use Scenario: Regulating 12V battery input to clean 5V rail for MCU, CAN transceiver, and sensor interface in door module or lighting controller. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing isolated 5V domain with UVLO, thermal shutdown, and hiccup protection against load dumps and short circuits. Use Value: Enables single-chip 5V conversion from raw vehicle battery (up to 76V during load dump) without external FET or compensation components - reducing BOM cost and PCB area by >30% vs discrete solutions. | Use Scenario: Powering digital I/O expansion cards in modular PLC backplanes where input rails vary from 24V to 48V DC. IC Role / Device Role / Timing Role: High-efficiency, wide-input buck converter delivering stable 5V at 1A to FPGA configuration logic and level-shifting buffers. Use Value: Maintains >90% efficiency across 24–48V input range and handles 100ms 76V transients per ISO 7637-2, eliminating need for upstream TVS clamping in many industrial enclosures. |
| Telecom Remote Radio Unit (RRU) Bias Supply | Medical Point-of-Care Diagnostic Instrument |
Use Scenario: Generating 5V bias for RF front-end ICs and ADC drivers in outdoor 4G/5G base station radios powered from 48V telecom rectifiers. IC Role / Device Role / Timing Role: Primary intermediate bus converter stepping 48V down to 5V with low quiescent current (270µA) to minimize standby power in sleep-mode RRUs. Use Value: Achieves 90% efficiency at 0.5A and maintains regulation during 48V line sag to 36V - ensuring uninterrupted RF calibration and data acquisition. | Use Scenario: Providing isolated 5V power to microcontroller, display backlight, and USB host controller in portable diagnostic devices using 24V medical-grade AC/DC adapters. IC Role / Device Role / Timing Role: Compact, thermally robust buck regulator meeting IEC 60601-1 creepage/clearance requirements when paired with reinforced isolation on input side. Use Value: Delivers 1A at 5V with <5% output deviation under 100mA–1A dynamic load steps - supporting fast touchscreen response and real-time sensor sampling without brownouts. |
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 | 42V max input, 100kHz fixed frequency, requires external compensation; no integrated VD regulator. | Suitable for lower-input industrial apps (<42V); lacks internal bias rail - needs external LDO for gate drive. | Select when input stays ≤42V and board space allows external compensation components. |
| LT8609SDE#TRPBF | 42V max input, 2.2MHz switching, 2.5µA quiescent current; synchronous rectification, no external diode needed. | Better for ultra-low-IQ battery systems; higher frequency enables smaller magnetics but increases EMI filtering complexity. | Choose for portable medical or IoT devices needing <3µA shutdown current and compact inductors - not for 76V automotive inputs. |
Compared with LM5017MH/NOPB and LT8609SDE#TRPBF, the MAX5035BUSA uniquely supports 76V input with integrated high-side FET and bias regulator - making it the only option among the three qualified for unregulated automotive battery rails without upstream pre-regulation.
Availability
MAX5035BUSA is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power rails, telecom remote radio units, and medical diagnostic instruments requiring stable component supply across extended temperature and high-voltage stress conditions.
Supply support for MAX5035BUSA 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 product line delivers high-efficiency, high-voltage step-down conversion for harsh-environment applications where wide input range, integrated protection, and minimal external components are essential - targeting automotive subsystems and industrial edge nodes.
FAQ
What is the maximum input voltage rating for the MAX5035BUSA?
The MAX5035BUSA has an absolute maximum input voltage rating of +80V on the VIN pin, with guaranteed operation up to +76V. This allows direct connection to automotive battery systems experiencing load dump transients per ISO 7637-2, provided proper input filtering and transient suppression are implemented per the datasheet layout guidelines.
Does the MAX5035BUSA require external feedback resistors to set the 5V output?
No, the MAX5035BUSA does not require external feedback resistors. It is a fixed-output variant with internal feedback network configured for 5.0V ±2.5%. The FB pin is internally connected to the output stage and must be tied directly to the 5V output node - no external resistor divider is needed or recommended.
What is the purpose of the VD pin on the MAX5035BUSA?
VD is the output of an internal linear regulator that supplies ~7.8V (6.5V to 9.0V) to power internal analog circuitry and gate drivers. It must be bypassed to GND with a 0.1µF ceramic capacitor placed adjacent to the pin. This rail powers the high-side gate driver (via BST) and error amplifier - failure to bypass VD causes startup failure or erratic switching.
Can the MAX5035BUSA operate safely at 125°C ambient temperature?
The MAX5035BUSA is specified for 0°C to +85°C ambient operation. For +125°C ambient, use the automotive-grade MAX5035BASA variant, which is tested and guaranteed over -40°C to +125°C junction temperature. The MAX5035BUSA's thermal resistance (θJA = 170°C/W) limits usable power at high ambient unless heatsinking is added.
What type of external diode is required for the MAX5035BUSA?
The MAX5035BUSA requires an external Schottky rectifier connected between LX and GND. Recommended parts include 50SQ100 (IR) or MBRM5100 (Diodes Inc.) - rated for ≥100V reverse voltage and ≥1A continuous forward current, with VF < 0.45V at max load to prevent conduction through the internal body diode and thermal shutdown.
MAX5035BUSA 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:
- Obsolete
- 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):
- 5V
- 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
MAX5035BUSA FAQ
1.How can I place an order for MAX5035BUSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035BUSA 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 MAX5035BUSA reliable?
The price and inventory of MAX5035BUSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035BUSA is usually 5 days.
3.What payment methods are accepted for MAX5035BUSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035BUSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035BUSA?
MAX5035BUSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035BUSA 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 MAX5035BUSA?
For technical support, including MAX5035BUSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035BUSA requirements.
6.How does Aetrix verify that MAX5035BUSA is sourced from the original manufacturer or authorized distributors?
All MAX5035BUSA 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 MAX5035BUSA meets industry standards.
7.What is the process for return or replacement of MAX5035BUSA?
All MAX5035BUSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035BUSA, 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 MAX5035BUSA part is unused and in its original packaging.
Return procedure for MAX5035BUSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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