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Analog Devices Inc./Maxim Integrated MAX5033AUSA+
- Part No.:
- MAX5033AUSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5033AUSA+.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,790
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Product details
Overview
The MAX5033AUSA+ from Maxim Integrated is a high-efficiency, 76V-input, fixed-output 3.3V step-down DC-DC converter with internal 0.4Ω high-side DMOS FET, 125kHz fixed-frequency PWM operation, and pulse-skipping mode for light-load efficiency. It delivers up to 500mA output current, features 270μA no-load quiescent current, and operates across 0°C to +85°C in an 8-pin SO package - ideal for industrial power rails and distributed automotive subsystems.
For engineers reviewing the MAX5033AUSA+ datasheet, MAX5033AUSA+ pinout, MAX5033AUSA+ application, or MAX5033AUSA+ equivalent, key selection criteria include input voltage range (7.5V–76V), output accuracy (±3.5% over load/temperature), thermal shutdown threshold (+160°C), undervoltage lockout (5.2V typ), and ON/OFF control interface compatibility with 3.3V/5V logic.
Technical Context
The MAX5033AUSA+ employs voltage-mode control with feed-forward compensation and integrates a high-voltage DMOS switch, eliminating external MOSFET requirements. Its internal 1.22V feedback reference and fixed 3.3V output simplify design while maintaining ±3.5% regulation over 20mA–500mA load and full temperature range.
It combines fixed-frequency PWM (109–137kHz) with automatic pulse-skipping at light loads to sustain >86% efficiency at 500mA (VIN=12V) and ultra-low 270μA quiescent current at no load - critical for battery-backed or always-on industrial sensors and telematics modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports wide-range industrial and automotive battery inputs without pre-regulation |
| Output Voltage | 3.3V ±3.5% (3.185V–3.415V) - tightly regulated for powering 3.3V microcontrollers and interfaces |
| Max Output Current | 500mA - limited by thermal dissipation in SO package (471mW @ +70°C) |
| Switching Frequency | 125kHz (109–137kHz) - enables compact magnetics and predictable EMI filtering |
| Quiescent Current | 270μA (typ) at no load - extends runtime in low-power wake-up circuits |
| Shutdown Current | 10μA (typ) - ensures near-zero leakage during system sleep modes |
| Internal Switch RDS(ON) | 0.4Ω (typ) - reduces conduction loss and eliminates external high-voltage MOSFET |
Pinout & Package
MAX5033AUSA+ is housed in an 8-pin SO (Small Outline) package with JEDEC MS-012AC footprint, 1.27mm pitch, and exposed pad not electrically connected. Thermal resistance θJA = 170°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BST | Bootstrap capacitor connection | Provides gate drive voltage for internal high-side DMOS via 0.1μF ceramic cap to LX; enables efficient 76V operation |
| 2 - VD | Internal regulator output | Supplies ~7.8V bias for internal circuitry; requires 0.1μF bypass to GND for stability |
| 3 - SGND | Signal ground reference | Must be tied directly to system GND; separates analog sensing from power return paths |
| 4 - FB | Feedback input | Internally connected to 3.3V output; senses VOUT for regulation - no external divider required |
| 5 - ON/OFF | Enable/shutdown control | Logic-compatible input (1.69V rising threshold); pulls low to reduce supply current to 10μA |
| 6 - GND | Power ground | Main return path for switch current and IC ground; star-connected to minimize noise coupling |
| 7 - VIN | Main input supply | Accepts 7.5V–76V; requires local low-ESR capacitor to handle high ripple current |
| 8 - LX | Switch node | Drives external inductor; connects to internal DMOS source - critical for layout EMI control |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-voltage DMOS switch | Eliminates external MOSFET and driver, reducing BOM count and PCB area in high-input designs |
| Internal frequency compensation | Enables stable loop response with minimal external components - no compensation network needed |
| Pulse-skipping light-load mode | Maintains >80% efficiency down to 1mA load, extending battery life in intermittent-sensing applications |
| Hiccup-mode short-circuit protection | Prevents thermal runaway during sustained output faults by cycling on/off until fault clears |
| Thermal shutdown with 20°C hysteresis | Shuts down at +160°C junction and auto-restarts at +140°C - protects against board-level overheating |
Applications
| Industrial Sensor Node Power | Automotive Body Control Module |
|---|---|
Use Scenario: Powering 3.3V RS-485 transceivers and low-power microcontrollers in remote factory-floor sensors with 24V/48V bus input. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering regulated 3.3V from unregulated industrial rail; handles line transients up to 76V. Use Value: Internal 76V-rated switch and UVLO prevent brownouts during bus dips; 270μA quiescent current enables multi-year battery operation in wireless variants. | Use Scenario: Supplying 3.3V logic for door module ECUs powered from vehicle battery (9V–16V nominal, up to 40V load dump). IC Role / Device Role / Timing Role: Input-stage DC-DC converter stepping down battery voltage to clean 3.3V rail for CAN transceivers and MCU I/O. Use Value: 5.2V UVLO ensures reliable startup after cranking; hiccup-mode protection survives accidental output shorts during assembly or field service. |
| Distributed Telecom Power | Medical Diagnostic Equipment |
Use Scenario: Local 3.3V conversion for FPGA configuration and ADC front-ends in modular base station cards fed from 48V backplane. IC Role / Device Role / Timing Role: Point-of-load regulator with fast transient response (<100μs recovery) to support burst-mode digital processing. Use Value: Fixed 125kHz switching enables predictable EMI filter design; 0.4Ω RDS(ON) minimizes heat rise in dense card layouts. | Use Scenario: Providing isolated 3.3V supply for patient-monitoring front-end ASICs where low-noise, low-quiescent operation is mandatory. IC Role / Device Role / Timing Role: Secondary regulated rail derived from isolated 5V or 12V intermediate bus; operates continuously in standby mode. Use Value: 10μA shutdown current meets IEC 62304 standby power limits; internal compensation avoids noise-sensitive external RC networks. |
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, 75V max input, 500mA, but uses external MOSFET and requires compensation network | Lacks integrated switch and internal compensation - increases design complexity and component count | Select when higher peak current (>500mA) or custom compensation is required |
| TPS54360DGQR | Adjustable output (1.22V–60V), 60V max input, 3.5A, integrated FET, but no fixed 3.3V variant and higher quiescent current (146μA) | Requires external resistor divider; unsuitable for space-constrained fixed-output designs | Select when adjustable output or higher current capability is needed, not for drop-in 3.3V replacement |
Compared with LM5008AMM/NOPB and TPS54360DGQR, the MAX5033AUSA+ offers lowest BOM count for fixed 3.3V conversion at 76V input, smallest solution size due to integrated switch and compensation, and lowest no-load current - making it optimal for cost- and space-sensitive industrial and automotive modules.
Availability
MAX5033AUSA+ is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control units, and distributed telecom power supplies requiring stable component supply, long-term lifecycle assurance, and lead(Pb)-free compliance.
Supply support for MAX5033AUSA+ 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 industrial, automotive, and communications markets.
The MAX5033 belongs to Maxim's MAXPower™ high-voltage DC-DC converter family, engineered specifically for rugged, wide-input industrial and automotive power conversion where reliability, integration, and low quiescent current are critical.
FAQ
What is the maximum input voltage rating for the MAX5033AUSA+?
The MAX5033AUSA+ has an absolute maximum input voltage rating of +80V, with recommended continuous operation up to +76V. Its undervoltage lockout activates at 5.2V (typ), ensuring safe startup only when sufficient input is present. This 76V operating limit makes the MAX5033AUSA+ suitable for 48V industrial systems and automotive applications subject to load-dump transients.
Does the MAX5033AUSA+ require external compensation components?
No, the MAX5033AUSA+ features fully internal frequency compensation optimized for stability with standard output LC filters. Unlike many buck controllers, it does not require external Type II or Type III compensation networks - simplifying layout and reducing bill-of-materials. The internal compensation is validated for use with typical 220μH inductors and 33μF–47μF output capacitors.
How does the MAX5033AUSA+ achieve high efficiency at light loads?
The MAX5033AUSA+ automatically switches from fixed-frequency PWM to pulse-skipping mode below ~65mA load current. In this mode, it skips switching cycles to maintain regulation while reducing average switching losses - achieving 270μA quiescent current at no load and sustaining >80% efficiency down to 1mA. This behavior is fully internal and requires no external configuration.
What protection features are built into the MAX5033AUSA+?
The MAX5033AUSA+ integrates cycle-by-cycle current limiting, hiccup-mode short-circuit protection, thermal shutdown (+160°C trip, +140°C restart), and undervoltage lockout. These functions operate autonomously without external components. During sustained overload, hiccup mode disables switching for ~10ms before retrying - preventing thermal damage while allowing automatic recovery once the fault clears.
Can the MAX5033AUSA+ be used with a 12V input to generate 3.3V at 500mA?
Yes - the MAX5033AUSA+ is fully specified for 12V input operation, delivering 3.3V at 500mA with typical efficiency of 86%. At this condition, power dissipation is ~350mW in the SO package, well within its 471mW derated limit at +70°C ambient. Layout best practices (short traces, star ground, proper thermal copper) ensure reliable operation without forced air cooling.
MAX5033AUSA+ 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:
- 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:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX5033AUSA+ FAQ
1.How can I place an order for MAX5033AUSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5033AUSA+ 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 MAX5033AUSA+ reliable?
The price and inventory of MAX5033AUSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5033AUSA+ is usually 5 days.
3.What payment methods are accepted for MAX5033AUSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5033AUSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5033AUSA+?
MAX5033AUSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5033AUSA+ 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 MAX5033AUSA+?
For technical support, including MAX5033AUSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5033AUSA+ requirements.
6.How does Aetrix verify that MAX5033AUSA+ is sourced from the original manufacturer or authorized distributors?
All MAX5033AUSA+ 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 MAX5033AUSA+ meets industry standards.
7.What is the process for return or replacement of MAX5033AUSA+?
All MAX5033AUSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5033AUSA+, 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 MAX5033AUSA+ part is unused and in its original packaging.
Return procedure for MAX5033AUSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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