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Analog Devices Inc./Maxim Integrated MAX5035EUSA+T
- Part No.:
- MAX5035EUSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5035EUSA+T.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,575
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Product details
Overview
The MAX5035EUSA+T from Maxim Integrated is a high-voltage, 1A step-down DC-DC converter with adjustable output (1.25V–13.2V), 7.5V–76V input range, fixed 125kHz PWM switching, and integrated 0.4Ω high-side DMOS FET. It delivers up to 94% efficiency, consumes only 270µA quiescent current at no load, and features thermal shutdown, hiccup-mode short-circuit protection, and automotive-grade operation (−40°C to +125°C) in an 8-pin SO package.
For engineers reviewing the MAX5035EUSA+T datasheet, MAX5035EUSA+T pinout, MAX5035EUSA+T application, or MAX5035EUSA+T equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed automotive/industrial use cases, and two rigorously cross-checked alternative parts with documented functional and application-level differences.
Technical Context
The MAX5035EUSA+T implements voltage-mode control with feed-forward compensation and internal frequency compensation-eliminating external compensation components. Its architecture integrates a high-voltage DMOS switch, internal 7.8V regulator (VD), and dedicated BST bootstrap driver for gate enhancement.
It operates in fixed-frequency PWM mode under heavy loads and automatically transitions to pulse-skipping mode at light loads to maintain high efficiency and ultra-low 270µA quiescent current. Protection includes undervoltage lockout (5.2V typ), cycle-by-cycle current limit (1.9A typ), thermal shutdown (+160°C), and 10µA shutdown current when ON/OFF is pulled low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports wide industrial and automotive battery rails including 24V, 36V, 48V, and 72V systems without pre-regulation. |
| Output Voltage | Adjustable 1.25V to 13.2V - set via external resistor divider; feedback reference is 1.221V (±0.029V) for precise regulation across temperature. |
| Max Output Current | 1A continuous - limited by thermal dissipation in SO package (471mW @ TA=+70°C, θJA=170°C/W). |
| Switching Frequency | 125kHz (109–137kHz range) - enables use of compact, low-cost 100µH inductors and reduces EMI compared to MHz-class converters. |
| Quiescent Current | 270µA (typ) at no load - ensures minimal standby power draw in always-on automotive modules and remote sensors. |
| Shutdown Current | 10µA (typ) - allows deep-sleep operation in battery-backed systems without significant drain. |
| High-Side RDS(ON) | 0.4Ω (typ) - minimizes conduction loss and improves full-load efficiency up to 94% at 24VIN/5VOUT. |
Pinout & Package
MAX5035EUSA+T 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 uses JEDEC-standard SOIC-8 footprint with 1.27mm pitch and exposed pad not present.
| 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; critical for reliable startup and PWM operation. |
| VD | Internal regulator output | Provides ~7.8V regulated supply for internal analog/digital circuitry and BST charging; 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 (not power ground) to avoid noise coupling into feedback path. |
| FB | Feedback input | Senses output voltage via external resistive divider; regulates VOUT to 1.221V at FB pin - determines all adjustable output voltages. |
| ON/OFF | Enable/shutdown control | Logic-level input: >1.65V (typ) enables operation; <1.5V (typ) disables with 100mV hysteresis; compatible with microcontroller GPIO or resistor-divider UVLO programming. |
| GND | Power ground return | Main power return path for VIN, LX, and internal switch; must be tied to SGND at single-point "star" ground to prevent ground bounce. |
| VIN | Main input supply | Accepts 7.5V–76V DC; requires local low-ESR bypass capacitor (e.g., 68µF aluminum + 0.1µF ceramic) placed adjacent to pin. |
| LX | Switch node | Drain of internal high-side DMOS; connects to external inductor and Schottky freewheeling diode anode; carries high dI/dt switching current. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.4Ω high-side DMOS FET | Eliminates need for external MOSFET and driver, reducing BOM count and PCB area while maintaining >90% efficiency at 1A load. |
| Internal frequency compensation | Enables stable loop response with no external compensation network - simplifies design and improves production yield across temperature and input conditions. |
| Pulse-skipping light-load mode | Maintains >85% efficiency down to 10mA load by dynamically reducing switching frequency, unlike fixed-frequency converters that suffer efficiency collapse below 10% load. |
| Hiccup-mode short-circuit protection | Shuts down on overcurrent, cools, then retries - prevents thermal runaway during sustained output shorts while protecting external diode and inductor. |
| Automotive-grade temperature range | Qualified from −40°C to +125°C junction temperature with guaranteed electrical performance - suitable for under-hood and engine-control applications. |
Applications
| Automotive Body Control Module (BCM) | Industrial Programmable Logic Controller (PLC) I/O Power |
|---|---|
Use Scenario: Powers microcontrollers, CAN transceivers, and sensor interfaces in vehicle door modules, lighting controllers, and seat control units supplied from 12V/24V battery with cold-crank dips to 6V. IC Role / Device Role / Timing Role: Primary 5V or 3.3V point-of-load regulator converting raw battery voltage; handles line transients up to 76V and operates continuously down to −40°C. Use Value: 270µA quiescent current prevents battery drain during vehicle sleep mode; hiccup protection survives accidental output shorts during service. |
Use Scenario: Supplies isolated field I/O circuits (digital inputs, analog outputs) in DIN-rail mounted PLCs powered from 24V DC industrial bus with surge exposure. IC Role / Device Role / Timing Role: Robust buck converter delivering stable 5V/12V to interface ICs; withstands 76V transients per IEC 61000-4-5 Level 3. Use Value: 76V absolute max rating and thermal shutdown enable reliable operation in harsh factory environments without external TVS clamping. |
| Railway Signaling Power Supply | Distributed Telecom Remote Radio Unit (RRU) |
Use Scenario: Generates 3.3V/5V for FPGA configuration, Ethernet PHYs, and watchdog timers in trackside signaling cabinets fed from 72V nominal DC traction supply. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator supporting wide input variation (40V–90V) due to long cable drops and regenerative braking spikes. Use Value: Adjustable output allows precise 3.3V generation for low-voltage logic; 125kHz switching avoids interference with critical 27MHz/433MHz signaling bands. |
Use Scenario: Provides 5V bias to RF front-end amplifiers and ADCs in outdoor 4G/5G RRUs powered from −48V telecom rectifier with lightning-induced surges. IC Role / Device Role / Timing Role: Intermediate buck stage stepping −48V (via external inverter) or 48V to 5V; operates reliably at +85°C ambient with derated output current. Use Value: 170°C/W θJA and thermal hysteresis (+160°C trip, +140°C recovery) enable safe intermittent overload handling during burst transmission. |
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 650kHz switching, 100V max input, 600mA output, requires external compensation. | Higher frequency enables smaller magnetics but increases EMI filtering complexity; lower current rating limits use in 1A+ loads. | Select LM5017MM/NOPB when board space is constrained and input exceeds 76V; verify loop stability with external compensation network. |
| TPS54360DGQ | 3.5–60V input, 3.5A output, 100kHz–2.5MHz programmable frequency, integrated soft-start. | Higher current and wider frequency range suit dynamic load applications, but lacks automotive temp grade and has higher 145µA quiescent current. | Choose TPS54360DGQ for high-current industrial supplies where extended temperature is not required and layout allows larger inductor. |
Compared with MAX5035EUSA+T, LM5017MM/NOPB offers higher input voltage tolerance but lower output current and no integrated compensation, while TPS54360DGQ delivers triple the current but sacrifices automotive qualification and ultra-low quiescent performance - making MAX5035EUSA+T optimal for space-constrained, low-power, high-reliability automotive and industrial point-of-load designs.
Availability
MAX5035EUSA+T is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power rails, railway signaling systems, and distributed telecom equipment requiring stable component supply across extended temperature and high-input-voltage conditions.
Supply support for MAX5035EUSA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX5035EUSA+T belongs to the MAXPower™ family of high-voltage DC-DC converters, designed specifically for robust, efficient power conversion in automotive and industrial environments where wide input ranges, low quiescent current, and extended temperature operation are mandatory.
FAQ
What is the output voltage range supported by the MAX5035EUSA+T?
The MAX5035EUSA+T supports an adjustable output voltage range of 1.25V to 13.2V, set using an external resistor divider connected to the FB pin. Its internal feedback reference is precisely 1.221V (±0.029V), enabling accurate regulation across the full range and temperature. This distinguishes it from fixed-output variants like MAX5035AUSA+T (3.3V) or MAX5035BUSA+T (5V).
Does the MAX5035EUSA+T require external compensation components?
No, the MAX5035EUSA+T includes internal frequency compensation optimized for stability with standard external components. This eliminates the need for external Type II or Type III compensation networks, simplifying design, reducing bill-of-materials cost, and improving consistency across production units without requiring loop analysis or tuning.
What is the maximum junction temperature and thermal protection behavior of the MAX5035EUSA+T?
The MAX5035EUSA+T triggers thermal shutdown at +160°C junction temperature and resumes operation once the die cools to +140°C, providing 20°C hysteresis. This hiccup-mode thermal protection prevents permanent damage during sustained overload or poor heatsinking, and is fully characterized across the −40°C to +125°C operating range specified for the MAX5035EUSA+T.
Can the MAX5035EUSA+T operate with input voltages below 7.5V?
No - the absolute minimum input voltage for functional operation of the MAX5035EUSA+T is 7.5V, as specified in its electrical characteristics. Below this, the internal regulator (VD) cannot sustain required bias, and undervoltage lockout prevents switching. Attempting operation below 7.5V may result in erratic behavior or failure to start, even if VIN momentarily exceeds 5.2V (UVLO threshold).
What type of external diode is required for the MAX5035EUSA+T, and why?
The MAX5035EUSA+T requires an external Schottky rectifier (e.g., 50SQ100) connected from LX to GND. A Schottky diode is mandatory due to its low forward voltage (<0.45V at full load), which prevents unintended conduction of the internal body diode and avoids excessive junction heating. Higher-VF diodes risk thermal shutdown and reduced efficiency.
MAX5035EUSA+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:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX5035EUSA+T FAQ
1.How can I place an order for MAX5035EUSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035EUSA+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 MAX5035EUSA+T reliable?
The price and inventory of MAX5035EUSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035EUSA+T is usually 5 days.
3.What payment methods are accepted for MAX5035EUSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035EUSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035EUSA+T?
MAX5035EUSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035EUSA+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 MAX5035EUSA+T?
For technical support, including MAX5035EUSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035EUSA+T requirements.
6.How does Aetrix verify that MAX5035EUSA+T is sourced from the original manufacturer or authorized distributors?
All MAX5035EUSA+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 MAX5035EUSA+T meets industry standards.
7.What is the process for return or replacement of MAX5035EUSA+T?
All MAX5035EUSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035EUSA+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 MAX5035EUSA+T part is unused and in its original packaging.
Return procedure for MAX5035EUSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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