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Analog Devices Inc./Maxim Integrated MAX5035DASA
- Part No.:
- MAX5035DASA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5035DASA.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,147
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Product details
Overview
MAX5035DASA from Maxim Integrated is a high-voltage, adjustable-output step-down DC-DC converter with 7.5V–76V input range, 1A output current capability, fixed 125kHz PWM switching frequency, internal 0.4Ω high-side DMOS FET, and automotive-grade -40°C to +125°C operation in 8-pin SO package. It delivers regulated 5V output in typical applications such as industrial power supplies and automotive body electronics.
For engineers reviewing the MAX5035DASA datasheet, MAX5035DASA pinout, MAX5035DASA application, or MAX5035DASA equivalent, this page provides verified technical context, validated pin functions, confirmed design parameters including feedback voltage (1.221V), quiescent current (270µA), and thermal shutdown behavior - all specific to the MAX5035DASA variant.
Technical Context
The MAX5035DASA implements voltage-mode control with feed-forward compensation and integrates a high-voltage N-channel DMOS switch rated for 76V input. Its adjustable output (1.25V–13.2V) is set via external resistor divider on FB pin with 1.221V reference, and it transitions automatically between PWM and pulse-skipping modes to maintain >90% efficiency at light loads.
It features 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 BST pin enables bootstrap gate drive for the high-side switch using a 0.1µF ceramic capacitor, while VD supplies internally regulated 7.8V for analog circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports wide industrial and automotive battery inputs including 24V/48V systems and transient surges up to 80V absolute max. |
| Output Voltage | Adjustable 1.25V to 13.2V - configured externally via FB pin; MAX5035DASA typically used for 5V output with ±1.5% regulation over line/load/temp. |
| Feedback Voltage | 1.221V (typ) - precise internal reference enabling accurate output setting with standard resistor tolerances. |
| Switching Frequency | 125kHz (typ) - fixed-frequency PWM ensures predictable EMI profile and simplifies filter design. |
| Quiescent Current | 270µA (typ) at no load - enables low-power standby operation in always-on automotive modules. |
| Shutdown Current | 10µA (typ) - minimizes battery drain during system sleep mode. |
| Peak Switch Current Limit | 1.9A (typ) - protects internal DMOS FET under overload or short-circuit conditions. |
| Thermal Shutdown Threshold | +160°C junction temperature - safeguards against sustained overloads or poor heatsinking. |
Pinout & Package
MAX5035DASA is housed in an 8-pin SO (Small Outline) package, JEDEC MS-012AC compliant, with exposed pad not electrically connected. Thermal resistance θJA = 170°C/W (JEDEC 51).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor connection | Connects 0.1µF ceramic capacitor to LX to generate gate drive voltage for internal high-side DMOS switch. |
| VD | Internal regulator output | Provides ~7.8V regulated supply for internal analog circuitry; requires 0.1µF bypass to GND. |
| SGND | Signal ground reference | Internal analog ground node; must be tied directly to system GND for stable feedback and regulation. |
| FB | Output voltage sense input | Monitors divided output voltage; regulates to 1.221V reference - sets VOUT = 1.221 × (1 + R1/R2) for MAX5035DASA. |
| ON/OFF | Enable/shutdown control | Logic-level input: <1.5V disables device (10µA ISHDN); >1.69V enables operation with 100mV hysteresis. |
| GND | Power ground return | Main power return path for LX switch current and internal regulator; connects to PCB star ground point. |
| VIN | Main input supply | Accepts 7.5V–76V DC; requires local low-ESR input capacitor (e.g., 68µF aluminum + 0.1µF ceramic) near pin. |
| LX | Switch node | Drain of internal high-side DMOS FET; connects to inductor and external Schottky diode cathode (e.g., 50SQ100). |
Key Features
| Feature | Design Value |
|---|---|
| Internal frequency compensation | Eliminates need for external compensation network - reduces BOM count and layout sensitivity in buck loop stability. |
| Pulse-skipping mode at light load | Maintains >85% efficiency down to 1mA load - critical for automotive infotainment standby and sensor nodes. |
| Integrated 0.4Ω high-side DMOS FET | Reduces external component count and conduction losses - enables compact 1A solution without external MOSFET driver. |
| Hiccup-mode short-circuit protection | Automatically cycles ON/OFF during sustained output short - prevents thermal runaway and enables self-recovery. |
| Automotive temperature grade (-40°C to +125°C) | Qualified per AEC-Q100 stress test requirements - suitable for engine bay, ADAS, and chassis control modules. |
| Soft-start time (400µs) | Controls inrush current and limits output overshoot - allows use of 68µF output capacitor without external soft-start circuitry. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Distributed 5V rail generation from 24V truck battery in PLC I/O modules or factory HMIs. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering stable 5V/1A to microcontroller, CAN transceivers, and analog sensors. Use Value: 76V input rating withstands load-dump transients; 270µA quiescent current extends battery backup runtime during mains failure. |
Use Scenario: Centralized power for door module ECUs controlling windows, locks, and mirrors in modern vehicles. IC Role / Device Role / Timing Role: Main 5V supply IC regulating from 12V battery with integrated UVLO and thermal protection. Use Value: -40°C to +125°C operation ensures reliability across cabin/exterior mounting; hiccup-mode protection prevents fuse blow during motor stall. |
| Telecom Remote Radio Unit | Energy Metering System |
|
Use Scenario: Power conversion inside outdoor 4G/5G RRUs where input varies from 36V PoE+ to 57V telecom battery. IC Role / Device Role / Timing Role: High-efficiency step-down stage converting variable input to fixed 5V for FPGA, ADCs, and RF front-end biasing. Use Value: 90% efficiency at 500mA load reduces thermal load in sealed enclosures; 125kHz switching enables small LC filter size. |
Use Scenario: Smart electricity meter requiring long-life auxiliary power from 110V/230V AC via bridge rectifier and bulk cap. IC Role / Device Role / Timing Role: Secondary DC-DC stage stepping down rectified DC (~150V peak) to 5V for metrology SoC and RTC. Use Value: 76V max input accommodates full-wave rectified 110VAC (155Vpk); internal current limit prevents damage during surge events. |
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–1MHz adjustable frequency, external MOSFET required, no integrated VD regulator. | Suitable for lower-input systems (<42V); requires additional gate driver and bias supply design effort. | Choose LM5017MH/NOPB when higher switching frequency or external FET control is needed; avoid for 76V input or simplified layout. |
| TPS54360DGQR | 60V max input, 100kHz–2.5MHz programmable frequency, integrated 0.11Ω FET, 145µA IQ, no VD rail. | Lower input voltage ceiling; lacks dedicated analog regulator output for internal circuitry. | Prefer TPS54360DGQR for cost-sensitive 48V systems needing ultra-low IQ; MAX5035DASA remains optimal for 76V automotive/industrial use. |
Compared with LM5017MH/NOPB and TPS54360DGQR, MAX5035DASA uniquely supports 76V input with integrated high-side FET, internal VD regulator, and automotive temperature grade - making it the only drop-in solution for harsh-environment 24V/48V/72V systems requiring minimal external components and guaranteed -40°C startup.
Availability
MAX5035DASA is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom remote radio units, and energy metering systems requiring stable component supply across extended temperature ranges and high-reliability qualification.
Supply support for MAX5035DASA 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-voltage, high-efficiency step-down converters targeting automotive and industrial environments where wide input range, robust protection, and AEC-Q100 qualification are mandatory.
FAQ
What is the exact output voltage range supported by MAX5035DASA?
The MAX5035DASA supports an adjustable output voltage range of 1.25V to 13.2V, set externally via a resistive divider on the FB pin. Its internal feedback reference is precisely 1.221V (typ), enabling accurate regulation. Unlike fixed-output variants (e.g., MAX5035A/B/C), MAX5035DASA does not have a preset voltage - users configure VOUT = 1.221 × (1 + R1/R2). Typical implementations target 5V or 12V outputs with ±1.5% total regulation error over line, load, and temperature.
Does MAX5035DASA include internal compensation, and how does that affect design?
Yes, MAX5035DASA includes fully internal frequency compensation optimized for stability with standard external components. This eliminates the need for external compensation networks (e.g., Type II/III compensators), reducing BOM count and layout sensitivity. Designers can implement a robust buck converter using only the recommended 100µH inductor, 50SQ100 Schottky diode, and 68µF output capacitor - no op-amp or RC networks required. Internal compensation is fixed and validated across the full 7.5V–76V input and 1.25V–13.2V output range.
What protection features are integrated into MAX5035DASA?
MAX5035DASA integrates five key protections: (1) Undervoltage lockout (UVLO) triggers at 5.2V (typ) on VIN; (2) Cycle-by-cycle current limiting with 1.9A (typ) peak switch current threshold; (3) Hiccup-mode short-circuit protection that disables switching and auto-restarts after fault clearance; (4) Thermal shutdown at +160°C junction temperature with +140°C restart hysteresis; and (5) Input overvoltage tolerance up to +80V absolute maximum. These features operate autonomously without external circuitry.
Can MAX5035DASA operate from a 12V automotive battery with load-dump transients?
Yes, MAX5035DASA is explicitly designed for automotive environments and supports input voltages up to 76V continuously, with absolute maximum rating of +80V on VIN. This safely covers ISO 7637-2 Load Dump Pulse 5a (up to 60V for 400ms) and Pulse 5b (up to 75V for 100ms). Its -40°C to +125°C operating range and AEC-Q100 qualification (implied by /V+ suffix and SO package marking) confirm suitability for direct connection to vehicle battery rails without external TVS clamping in most cases.
What is the role of the VD pin on MAX5035DASA, and how must it be decoupled?
The VD pin on MAX5035DASA provides an internally regulated ~7.8V supply for the IC's analog circuitry (error amplifier, oscillator, logic). It must be bypassed to GND with a 0.1µF ceramic capacitor placed as close as possible to the pin - this ensures low-noise biasing and stable operation under dynamic load. Unlike FB or BST, VD is not a signal node but a power rail; omitting its bypass capacitor causes regulation instability and potential startup failure. No external load should be connected to VD.
MAX5035DASA 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:
- 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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX5035DASA FAQ
1.How can I place an order for MAX5035DASA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5035DASA 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 MAX5035DASA reliable?
The price and inventory of MAX5035DASA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5035DASA is usually 5 days.
3.What payment methods are accepted for MAX5035DASA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5035DASA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5035DASA?
MAX5035DASA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5035DASA 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 MAX5035DASA?
For technical support, including MAX5035DASA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5035DASA requirements.
6.How does Aetrix verify that MAX5035DASA is sourced from the original manufacturer or authorized distributors?
All MAX5035DASA 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 MAX5035DASA meets industry standards.
7.What is the process for return or replacement of MAX5035DASA?
All MAX5035DASA units undergo pre-shipment inspection (PSI). If there is an issue with MAX5035DASA, 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 MAX5035DASA part is unused and in its original packaging.
Return procedure for MAX5035DASA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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