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Analog Devices Inc./Maxim Integrated MAX5033AUSA+T
- Part No.:
- MAX5033AUSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5033AUSA+T.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,802
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Product details
Overview
The MAX5033AUSA+T from Maxim Integrated is a high-voltage, fixed-output (3.3V), 500mA step-down DC-DC converter operating from 7.5V to 76V input, featuring 125kHz fixed-frequency PWM control, internal 0.4Ω high-side DMOS FET, and 270μA no-load quiescent current. It delivers regulated 3.3V power in industrial distributed power systems where wide-input, high-efficiency conversion with minimal external components is required.
For engineers reviewing the MAX5033AUSA+T datasheet, MAX5033AUSA+T pinout, MAX5033AUSA+T application, or MAX5033AUSA+T equivalent, key selection criteria include its 76V max input rating, automotive-grade temperature range (–40°C to +125°C for A-grade variants), integrated thermal shutdown, hiccup-mode short-circuit protection, and compatibility with standard 8-pin SO package layouts.
Technical Context
The MAX5033AUSA+T implements voltage-mode PWM control with feed-forward compensation and internal frequency compensation, eliminating need for external loop compensation components. Its architecture integrates a high-voltage DMOS switch, bootstrap gate driver (BST pin), and internal 7.8V linear regulator (VD pin) to power analog circuitry.
It operates in fixed-frequency PWM mode under heavy load and automatically transitions to pulse-skipping mode at light loads to maintain high efficiency (>90% at 500mA, VIN=12V) while minimizing no-load IQ (270μA typ). Protection features include undervoltage lockout (5.2V typ), cycle-by-cycle current limit (1.5A typ), and thermal shutdown at +160°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports wide industrial and automotive battery-fed inputs including 24V, 48V, and 72V nominal systems. |
| Output Voltage | 3.3V ±3.5% (3.185V–3.415V) - tightly regulated fixed output suitable for powering 3.3V logic, microcontrollers, and sensors. |
| Max Output Current | 500mA - limited by thermal dissipation in 8-pin SO package (471mW @ TA=+70°C). |
| Switching Frequency | 125kHz (109–137kHz) - fixed frequency enables predictable EMI filtering and simplifies inductor selection. |
| Quiescent Current | 270μA (typ) at no load - enables low-power standby operation in always-on systems. |
| Shutdown Current | 10μA (typ) - allows deep sleep mode with minimal system leakage. |
| On-Resistance (RDS(ON)) | 0.4Ω (typ) - reduces conduction loss and improves full-load efficiency up to 90%. |
Pinout & Package
MAX5033AUSA+T is housed in an 8-pin SO (Small Outline) package, JEDEC MS-012AC, with exposed pad for thermal enhancement. Pin pitch is 1.27mm; body dimensions are 4.9mm × 6.0mm × 1.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor connection | Provides gate drive voltage for internal high-side DMOS; requires 0.1μF ceramic cap between BST and LX. |
| VD | Internal regulator output | 7.8V linear regulator output powering internal analog blocks; bypassed with 0.1μF ceramic cap to GND. |
| SGND | Signal ground reference | Internal analog ground node; must be connected directly to system GND plane to avoid noise coupling. |
| FB | Feedback input | Connects directly to VOUT for fixed 3.3V operation; senses output to regulate via internal 1.221V reference. |
| ON/OFF | Enable/shutdown control | Logic-level input (1.69V rising threshold); pulled high for operation, grounded for 10μA shutdown state. |
| GND | Power ground | Main return path for high-current switching loop; must be star-connected with LX, D1 cathode, and CIN ground. |
| VIN | Main input supply | Accepts 7.5–76V DC; requires local low-ESR bypass capacitor (e.g., 47μF aluminum + 0.1μF ceramic). |
| LX | Switch node | Drain of internal high-side DMOS; connects to external inductor and Schottky diode anode; high dv/dt node requiring tight layout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-voltage DMOS switch | Eliminates external MOSFET and gate driver, reducing BOM count and PCB area in high-input designs. |
| Internal frequency compensation | Enables stable operation with only 3 external components (inductor, output cap, Schottky diode) - no compensation network needed. |
| Pulse-skipping light-load mode | Maintains >80% efficiency down to 10mA load while holding IQ below 300μA - critical for battery-backed systems. |
| Hiccup-mode short-circuit protection | Auto-retries after fault clearance instead of latching off, enabling self-recovery in transient overload conditions. |
| Thermal shutdown with hysteresis | Shuts down at +160°C and re-enables at +140°C, preventing thermal runaway while allowing safe restart after cooling. |
Applications
| Industrial Control Systems | Railway & Transportation Power |
|---|---|
Use Scenario: Powering PLC I/O modules and fieldbus interfaces (e.g., RS-485 transceivers, CAN nodes) from 24V/48V DC traction or auxiliary supplies. IC Role / Device Role / Timing Role: Primary 3.3V point-of-load regulator converting unregulated vehicle battery voltage to clean logic supply. Use Value: Withstands 76V transients per EN 50155; maintains regulation during cold-crank dips to 7.5V; eliminates need for pre-regulator stage. | Use Scenario: Supplying 3.3V to onboard diagnostics, telematics units, and display controllers in locomotive or rolling stock electronics. IC Role / Device Role / Timing Role: High-reliability buck converter meeting extended temperature (–40°C to +125°C) and vibration requirements. Use Value: A-grade variant (MAX5033AASA) qualified for automotive temp range; supports 125°C junction operation without derating. |
| Telecom Distributed Power | Energy Metering & Smart Grid Sensors |
Use Scenario: Generating 3.3V bias for optical transceivers, Ethernet PHYs, and MCU subsystems in remote radio units or base station subcards. IC Role / Device Role / Timing Role: Secondary DC-DC stage stepping down 48V telecom bus to isolated logic rails. Use Value: 90% peak efficiency at 500mA reduces heat buildup in dense card cages; 125kHz switching avoids sensitive RF bands. | Use Scenario: Powering metrology SoCs, RTCs, and wireless modules (NB-IoT, LoRa) in solid-state electricity meters exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: Primary non-isolated 3.3V supply derived from 12–60V DC input from meter's auxiliary winding or supercapacitor backup. Use Value: 270μA quiescent current extends battery/supercap backup runtime; UVLO prevents brownout operation during grid sag. |
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 500kHz switching frequency; lower max input (75V); no integrated VD regulator; requires external compensation. | Better suited for compact designs needing higher frequency and smaller magnetics; lacks internal LDO for analog bias. | Select when board space is constrained and 500kHz EMI profile is acceptable; verify external compensation stability. |
| TPS54340DDAR | Adjustable output only; 4.5–42V input range; higher IQ (146μA) but no pulse-skipping; includes soft-start pin. | Not suitable for 76V input or fixed 3.3V use; targets mid-range industrial inputs with tighter output adjustability. | Choose only if input stays ≤42V and adjustable VOUT is required; cannot replace MAX5033AUSA+T in high-voltage applications. |
Compared with LM5008AMM/NOPB and TPS54340DDAR, the MAX5033AUSA+T uniquely combines 76V input capability, fixed 3.3V output, integrated VD bias rail, and pulse-skipping efficiency - making it optimal for ruggedized 3.3V PoL conversion where input voltage exceeds 42V and simplicity is prioritized over frequency flexibility.
Availability
MAX5033AUSA+T is available at Aetrix Electronics and suitable for industrial control systems, railway electronics, telecom distributed power, and smart grid sensor applications requiring stable component supply across extended temperature and high-input-voltage conditions.
Supply support for MAX5033AUSA+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 step-down converters targeting distributed power architectures in harsh environments - emphasizing wide input range, integrated protection, and minimal external component count.
FAQ
What is the maximum input voltage rating for the MAX5033AUSA+T?
The MAX5033AUSA+T supports an absolute maximum input voltage of +80V, with guaranteed operation across 7.5V to 76V. This makes it suitable for 48V and 72V industrial bus systems, including those subject to load-dump transients. The device incorporates internal undervoltage lockout that activates at 5.2V (typ) to prevent startup under insufficient input conditions.
Does the MAX5033AUSA+T require external compensation components?
No, the MAX5033AUSA+T includes fully internal frequency compensation optimized for stability with standard external components (inductor, output capacitor, Schottky diode). No external RC networks or compensation capacitors are needed - simplifying design and reducing bill-of-materials cost compared to controllers requiring external loop compensation.
How does the MAX5033AUSA+T achieve high efficiency at light loads?
The MAX5033AUSA+T achieves high light-load efficiency through automatic transition to pulse-skipping mode, reducing switching activity while maintaining regulation. At no load, it draws only 270μA (typ); in shutdown, current drops to 10μA (typ). This behavior is inherent to its control architecture and requires no external configuration - ideal for always-on monitoring circuits.
What is the purpose of the VD pin on the MAX5033AUSA+T?
The VD pin on the MAX5033AUSA+T outputs a regulated 7.8V (6.5V–9.0V) supply used internally to power the analog control circuitry and gate driver. It must be bypassed to GND with a 0.1μF ceramic capacitor. This integrated LDO eliminates the need for an external bias supply and ensures robust operation across the full input range.
Can the MAX5033AUSA+T be used in automotive applications?
Yes - the MAX5033AUSA+T itself is rated for 0°C to +85°C, but its A-grade variant (MAX5033AASA) is specified for –40°C to +125°C and qualified for automotive use. While MAX5033AUSA+T is not AEC-Q200 qualified, its architecture (UVLO, thermal shutdown, hiccup protection) aligns with automotive reliability requirements, and many designers use it in non-safety-critical automotive subsystems with proper derating.
MAX5033AUSA+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:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX5033AUSA+T FAQ
1.How can I place an order for MAX5033AUSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5033AUSA+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 MAX5033AUSA+T reliable?
The price and inventory of MAX5033AUSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5033AUSA+T is usually 5 days.
3.What payment methods are accepted for MAX5033AUSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5033AUSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5033AUSA+T?
MAX5033AUSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5033AUSA+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 MAX5033AUSA+T?
For technical support, including MAX5033AUSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5033AUSA+T requirements.
6.How does Aetrix verify that MAX5033AUSA+T is sourced from the original manufacturer or authorized distributors?
All MAX5033AUSA+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 MAX5033AUSA+T meets industry standards.
7.What is the process for return or replacement of MAX5033AUSA+T?
All MAX5033AUSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5033AUSA+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 MAX5033AUSA+T part is unused and in its original packaging.
Return procedure for MAX5033AUSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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