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Analog Devices Inc./Maxim Integrated MAX5033AASA+T
- Part No.:
- MAX5033AASA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5033AASA+T.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:8,601
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Product details
Overview
The MAX5033AASA+T from Maxim Integrated is a high-voltage, 500mA step-down DC-DC converter with fixed 3.3V output, operating from 7.5V to 76V input and featuring internal 0.4Ω high-side DMOS FET, 125kHz fixed-frequency PWM control, and pulse-skipping mode for light-load efficiency. It delivers stable power in automotive engine control units, industrial sensors, and distributed power rails where wide VIN and high temperature reliability are critical.
For engineers reviewing the MAX5033AASA+T datasheet, MAX5033AASA+T pinout, MAX5033AASA+T application, or MAX5033AASA+T equivalent, key selection criteria include its -40°C to +125°C automotive-grade SO-8 package, 270μA no-load quiescent current, undervoltage lockout at 5.2V, thermal shutdown at +160°C, and integrated frequency compensation eliminating external loop components.
Technical Context
The MAX5033AASA+T implements voltage-mode PWM control with feed-forward compensation, enabling stable regulation across its 7.5V–76V input range while maintaining tight output accuracy (±3.5% over temperature and load). Its internal high-side DMOS switch and bootstrap gate drive (BST pin) support efficient high-VIN buck conversion without external MOSFET drivers.
It features automatic transition between fixed-frequency PWM and pulse-skipping mode below ~65mA load, reducing IQ to 270μA at no load and 10μA in shutdown. Protection includes cycle-by-cycle current limiting (1.5A typ), hiccup-mode short-circuit response, and thermal shutdown with 20°C hysteresis - all implemented in a single monolithic IC with no external sensing resistors required.
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 systems without pre-regulation. |
| Output Voltage | Fixed 3.3V ±3.5% - tightly regulated for powering microcontrollers, CAN transceivers, and low-voltage logic in harsh environments. |
| Max Output Current | 500mA - limited by thermal dissipation in SO-8 package; peak switch current limit is 1.5A (typ) for transient overload handling. |
| Quiescent Current | 270μA at no load - enables always-on operation in battery-backed systems without excessive drain. |
| Switching Frequency | 125kHz (105–137kHz over temp) - balances EMI, inductor size, and efficiency; fixed frequency simplifies EMI filtering design. |
| On-Resistance (RDS(ON)) | 0.4Ω (typ) - reduces conduction loss and improves full-load efficiency up to 86% at 12VIN/3.3VOUT. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial control applications per AEC-Q100 stress test conditions. |
Pinout & Package
MAX5033AASA+T is housed in an 8-pin SO (Small Outline) package with exposed pad for thermal enhancement, compatible with JEDEC MS-012AC standard. Pin 1 is BST; pin 6 is GND; pin 8 is LX - all pins require strict layout adherence per datasheet recommendations for stability and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor connection | Provides gate-drive voltage for internal high-side DMOS; requires 0.1μF ceramic cap to LX - misplacement causes startup failure or erratic switching. |
| VD | Internal regulator output | Supplies bias for internal analog circuitry; must be bypassed to GND with 0.1μF ceramic cap - insufficient decoupling causes oscillation or UVLO false triggering. |
| SGND | Signal ground reference | Internal analog ground node; must connect directly to system GND plane - floating SGND degrades feedback accuracy and load regulation. |
| FB | Feedback input | Senses output voltage; for MAX5033A, connected directly to VOUT - open or shorted FB disables regulation and forces uncontrolled output. |
| ON/OFF | Shutdown control input | Logic-level enable; rising threshold 1.69V (typ); hysteresis 100mV - used for system-level power sequencing or UVLO programming via resistor divider. |
| GND | Power ground return | Main return path for high-current switch node; must tie to star ground point with LX, rectifier cathode, and input/output caps - poor grounding causes thermal runaway. |
| VIN | Main input supply | Accepts 7.5V–76V; requires low-ESR input capacitor placed adjacent to pin - inadequate capacitance induces input rail collapse during switching transitions. |
| LX | Switch node | Drives external inductor; connects internally to high-side DMOS source - routing must minimize loop area to reduce EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side DMOS FET | Eliminates need for external MOSFET and driver, reducing BOM count and PCB footprint by >30% versus discrete buck controllers. |
| Internal frequency compensation | Enables stable operation with only two external components (inductor + output cap) - removes requirement for Type II/III compensation network design. |
| Pulse-skipping light-load mode | Maintains >80% efficiency down to 1mA load - critical for IoT sensor nodes and always-on automotive modules with intermittent activity. |
| Hiccup-mode short-circuit protection | Automatically cycles on/off during sustained output shorts - prevents thermal damage without requiring external current-limit circuitry or fusing. |
| Automotive-grade temperature range | Validated operation from -40°C to +125°C junction - meets requirements for engine control, transmission, and ADAS subsystems without derating. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Sensor Node |
|---|---|
Use Scenario: Powers 3.3V microcontroller, CAN transceiver, and analog front-end in diesel/gasoline engine management systems exposed to under-hood temperatures up to +125°C. IC Role / Device Role / Timing Role: Primary 3.3V point-of-load regulator converting raw 12V/24V battery rail; provides clean, regulated supply independent of cranking dips or load dump transients. Use Value: 76V absolute max rating withstands ISO 7637-2 load dump pulses; 270μA quiescent current extends battery life during vehicle sleep mode. | Use Scenario: Supplies 3.3V to wireless pressure/temperature sensors mounted on factory-floor machinery with wide ambient temperature swings (-40°C to +85°C). IC Role / Device Role / Timing Role: Isolated DC-DC stage delivering stable 3.3V from 24V industrial bus; operates continuously in dusty, vibration-prone environments. Use Value: Fixed 3.3V output eliminates external resistor divider errors; SO-8 package supports automated optical inspection and reflow compatibility. |
| Distributed Power for Fieldbus Systems | Railway Signaling Interface |
Use Scenario: Provides local 3.3V power to PROFIBUS/Modbus slave nodes installed along long cable runs where input voltage can sag to 7.5V. IC Role / Device Role / Timing Role: Buck converter accepting wide-input industrial bus voltage; regulates precisely despite line impedance-induced drops. Use Value: 7.5V minimum input ensures reliable start-up even with 20% voltage drop across 100m of 22AWG wire; 500mA output supports multiple digital isolators and RS-485 transceivers. | Use Scenario: Powers safety-critical 3.3V logic in railway trackside signaling cabinets subjected to EN 50121-3-2 conducted immunity and thermal cycling. IC Role / Device Role / Timing Role: Primary DC-DC regulator converting 72V nominal traction supply to isolated 3.3V domain for FPGA-based signal processors. Use Value: Thermal shutdown at +160°C with 20°C hysteresis prevents latch-up during cabinet overheating; 125kHz switching avoids interference with 50Hz AC signaling frequencies. |
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 3.3V output, 500mA, 7.5–100V input, 1MHz switching, no internal compensation - requires external RC network. | Higher frequency enables smaller magnetics but increases EMI sensitivity; lacks hiccup-mode protection. | Select when board space is constrained and EMI filtering is already designed; avoid in thermally limited enclosures due to higher switching losses. |
| TPS54360DDAR | Adjustable output (1.22–60V), 3.5A, 3.5–60V input, 100kHz–2.5MHz programmable frequency, internal compensation. | Higher current capability and wider VIN range, but fixed 3.3V version not available - requires external feedback resistors. | Choose for future-proof designs needing output flexibility or higher load headroom; adds BOM cost and layout complexity for fixed 3.3V use. |
Compared with LM5008AMM/NOPB and TPS54360DDAR, the MAX5033AASA+T offers plug-and-play 3.3V regulation with zero external compensation, superior light-load efficiency via pulse-skipping, and automotive-grade thermal robustness - making it optimal for cost-sensitive, high-reliability embedded power rails.
Availability
MAX5033AASA+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor nodes, and distributed fieldbus power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX5033AASA+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, designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX5033 product line delivers high-voltage, high-efficiency buck converters optimized for automotive and industrial environments where wide input range, extended temperature operation, and minimal external components are essential.
FAQ
What is the maximum input voltage the MAX5033AASA+T can safely handle?
The MAX5033AASA+T has an absolute maximum input voltage rating of +80V, with recommended continuous operation up to +76V. Exceeding +80V risks permanent damage. Its 7.5V–76V operating range supports direct connection to 24V/48V industrial buses and automotive batteries, including transient load-dump events compliant with ISO 7637-2. The device incorporates undervoltage lockout at 5.2V to prevent erratic startup during brownouts.
Does the MAX5033AASA+T require external compensation components?
No, the MAX5033AASA+T includes fully integrated Type III compensation, eliminating the need for external capacitors or resistors in the feedback loop. This allows stable operation with only the required external inductor, output capacitor, bootstrap capacitor, and input bypass capacitor. The internal compensation is optimized for typical 3.3V output configurations using standard 220μH inductors and low-ESR output capacitors, significantly reducing design time and layout risk.
How does the MAX5033AASA+T manage thermal protection?
The MAX5033AASA+T features integrated thermal shutdown that activates at +160°C junction temperature, turning off the internal high-side switch and entering hiccup mode until the die cools to +140°C. This 20°C hysteresis prevents rapid cycling. In the SO-8 package, thermal resistance θJA is 170°C/W, so proper PCB copper pour under the exposed pad is essential. Derating begins above +70°C ambient, with maximum continuous power dissipation dropping from 471mW at +70°C to ~235mW at +125°C ambient.
Can the MAX5033AASA+T be used in automotive applications?
Yes, the MAX5033AASA+T is explicitly rated for the automotive temperature range of -40°C to +125°C and is manufactured in a lead(Pb)-free SO-8 package compliant with RoHS and AEC-Q100 stress testing requirements. Its 76V input capability handles load-dump transients, and its 270μA quiescent current supports low-power sleep modes required by modern automotive ECUs. The device is widely deployed in engine control, body electronics, and ADAS subsystems.
What external components are mandatory for basic operation of the MAX5033AASA+T?
Four external components are mandatory: (1) an inductor (220μH typical for 3.3V/500mA), (2) an output capacitor (≥33μF low-ESR), (3) a bootstrap capacitor (0.1μF ceramic between BST and LX), and (4) an input bypass capacitor (≥47μF low-ESR). Additionally, a Schottky freewheeling diode (e.g., 50SQ100) is required. No feedback resistors are needed for the MAX5033AASA+T since its 3.3V output is internally fixed - FB is connected directly to VOUT.
MAX5033AASA+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:
- 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:
- 500mA
- Frequency - Switching:
- 125kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX5033AASA+T FAQ
1.How can I place an order for MAX5033AASA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5033AASA+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 MAX5033AASA+T reliable?
The price and inventory of MAX5033AASA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5033AASA+T is usually 5 days.
3.What payment methods are accepted for MAX5033AASA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5033AASA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5033AASA+T?
MAX5033AASA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5033AASA+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 MAX5033AASA+T?
For technical support, including MAX5033AASA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5033AASA+T requirements.
6.How does Aetrix verify that MAX5033AASA+T is sourced from the original manufacturer or authorized distributors?
All MAX5033AASA+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 MAX5033AASA+T meets industry standards.
7.What is the process for return or replacement of MAX5033AASA+T?
All MAX5033AASA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5033AASA+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 MAX5033AASA+T part is unused and in its original packaging.
Return procedure for MAX5033AASA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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