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Analog Devices Inc./Maxim Integrated MAX5033BUSA+
- Part No.:
- MAX5033BUSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5033BUSA+.pdf
- Description:
- IC REG BUCK 5V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,273
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Product details
Overview
The MAX5033BUSA+ from Maxim Integrated is a high-efficiency, 76V-input, fixed-5V output step-down DC-DC converter featuring 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, consumes only 270μA quiescent current at no load, and operates across 0°C to +85°C in an 8-pin SO package - ideal for industrial power supplies and distributed power architectures.
For engineers reviewing the MAX5033BUSA+ datasheet, MAX5033BUSA+ pinout, MAX5033BUSA+ application, or MAX5033BUSA+ equivalent, key selection criteria include its 7.5–76V input range, ±2.5% output voltage accuracy over load/temperature, integrated thermal shutdown and hiccup-mode short-circuit protection, and compatibility with standard 220µH inductors and Schottky rectifiers like 50SQ100.
Technical Context
This voltage-mode buck regulator uses feed-forward control and internal compensation to maintain stability across wide VIN ranges without external loop components. Its integrated high-side switch and bootstrap gate drive (BST pin) enable efficient high-voltage step-down conversion while minimizing external BOM count.
The device implements dual protection schemes: cycle-by-cycle current limiting with 0.95–2.1A peak switch limit, and thermal shutdown triggered at +160°C junction temperature with +20°C hysteresis. Undervoltage lockout activates at 5.2V (typ) on VIN, and ON/OFF control provides 1.50–1.85V rising threshold with 100mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports wide industrial and automotive battery inputs without pre-regulation |
| Output Voltage | 5.0V ±2.5% (4.85–5.15V) - tightly regulated fixed output suitable for powering logic, sensors, and analog circuitry |
| Max Output Current | 500mA - limited by thermal dissipation in SO package (471mW @ 70°C ambient) |
| Switching Frequency | 125kHz (105–137kHz) - enables use of compact, low-cost magnetics and reduces EMI compared to higher frequencies |
| Quiescent Current | 270μA (typ) at no load - extends battery life in always-on systems |
| Shutdown Current | 10μA (typ) - enables ultra-low-power system-level sleep modes |
| Internal Switch RDS(ON) | 0.4Ω (typ) - minimizes conduction loss and improves full-load efficiency up to 90% |
Pinout & Package
MAX5033BUSA+ is housed in an 8-pin SO (Small Outline) package with gull-wing leads, JEDEC MS-012AC compliant, 1.27mm pitch, and rated for 0°C to +85°C operation. Thermal resistance θJA = 170°C/W.
| 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 | Supplies bias for gate driver; bypassed to GND with 0.1μF ceramic capacitor |
| SGND | Signal ground reference | Must be connected to system ground; separates analog and power return paths |
| FB | Feedback input | Connected directly to VOUT for fixed-5V operation; senses regulated output voltage |
| ON/OFF | Enable/shutdown control | Pulled high (>1.69V) for operation; pulled low for 10μA shutdown state |
| GND | Power ground | Main return path for high-current switching node; tied to SGND externally |
| VIN | Main input supply | Accepts 7.5–76V; requires local low-ESR bypass capacitor near pin |
| LX | Switch node | Connects to inductor and Schottky diode cathode; carries high dv/dt switching waveform |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side DMOS FET | Eliminates need for external MOSFET and driver, reducing board area and component count |
| Internal frequency compensation | Enables stable operation with minimal external components - no compensation network required |
| Pulse-skipping light-load mode | Maintains >80% efficiency down to 10mA load while holding quiescent current at 270μA |
| Hiccup-mode short-circuit protection | Prevents thermal runaway during sustained overload by cycling on/off until fault clears |
| Thermal shutdown with hysteresis | Shuts down at +160°C and restarts at +140°C, enabling self-recovery in intermittent fault conditions |
Applications
| Industrial Power Supply | Distributed Power Architecture |
|---|---|
Use Scenario: Providing isolated 5V rail for PLC I/O modules powered from 24V or 48V DC bus. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering regulated 5V to microcontrollers, ADCs, and digital isolators. Use Value: High input voltage tolerance eliminates need for intermediate 12V stage; 90% efficiency at 500mA reduces heatsink requirements. | Use Scenario: Local point-of-load conversion in telecom shelf systems with 48V backplane. IC Role / Device Role / Timing Role: Compact, high-VIN buck converter generating 5V for FPGA configuration and management ICs. Use Value: 76V absolute max rating accommodates transient surges; 8-pin SO footprint fits dense PCB layouts. |
| Automotive Body Control Module | Consumer Smart Home Hub |
Use Scenario: Converting 12V battery (up to 16V cranking) or 24V commercial vehicle supply to stable 5V for MCU and CAN transceivers. IC Role / Device Role / Timing Role: Main 5V power source with UVLO set to prevent startup below safe battery voltage. Use Value: Internal 5.2V UVLO and 10μA shutdown current support cold-cranking and low-power sleep states. | Use Scenario: Powering Wi-Fi SoC, sensors, and LED indicators in always-on smart speaker or hub devices. IC Role / Device Role / Timing Role: Efficient primary DC-DC converter operating from USB-C PD or wall adapter input. Use Value: Pulse-skipping mode maintains >85% efficiency at 1–10mA standby loads, extending battery backup runtime. |
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 | 4.5–75V input, 5V fixed output, 500mA, 1MHz switching, no internal compensation - requires external RC network | Higher frequency enables smaller inductors but increases EMI sensitivity and layout complexity | Choose when board space is critical and design team has experience tuning high-frequency buck loops |
| TPS54202DRCT | 4.5–28V input, adjustable 0.6–28V output, 2A, 400kHz–2.5MHz programmable frequency, integrated compensation | Lower max input voltage limits use in 48V+ systems; higher current capability adds margin but increases cost/size | Choose for lower-input systems needing flexibility and higher output current, not for 76V-rated designs |
Compared with LM5008AMM/NOPB and TPS54202DRCT, the MAX5033BUSA+ uniquely combines 76V input rating, fixed 5V output, internal compensation, and automotive-grade thermal protection in a single 8-pin SO package - making it optimal for high-input, space-constrained, and reliability-critical applications where simplicity and ruggedness are prioritized over programmability or ultra-high frequency.
Availability
MAX5033BUSA+ is available at Aetrix Electronics and suitable for industrial power supplies, distributed power architectures, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and lead(Pb)-free compliance.
Supply support for MAX5033BUSA+ 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 DC-DC conversion for systems operating from unregulated 24V, 48V, or 72V sources - targeting applications where reliability, small size, and minimal external components are essential.
FAQ
What is the maximum input voltage the MAX5033BUSA+ can withstand?
The MAX5033BUSA+ has an absolute maximum input voltage rating of +80V on the VIN pin, with recommended continuous operation up to +76V. Exceeding +80V may cause permanent damage. The device incorporates undervoltage lockout that prevents operation below ~5.2V, ensuring reliable startup across wide input transients.
Does the MAX5033BUSA+ require external compensation components?
No, the MAX5033BUSA+ features fully internal frequency compensation optimized for stability with standard output filter configurations. No external RC networks or type-II/type-III compensators are needed - simplifying design and reducing bill-of-materials cost compared to controllers requiring external loop compensation.
How does the MAX5033BUSA+ handle short-circuit conditions?
The MAX5033BUSA+ employs hiccup-mode output short-circuit protection: upon detecting overcurrent, it shuts down the switch, waits a fixed interval, then attempts restart. This cycle repeats until the fault clears, limiting average power dissipation and preventing thermal damage - unlike latch-off or constant-current limiting schemes.
Can the MAX5033BUSA+ be used with a 24V input to deliver 5V at 500mA?
Yes - the MAX5033BUSA+ is specifically characterized for 24V input: at VIN = 24V, VOUT = 5V, and ILOAD = 500mA, typical efficiency is 90%. With proper layout (short traces, star grounding, 0.1μF BST/VD caps), thermal rise remains within SO-package limits even at full load and +85°C ambient.
What external components are mandatory for basic MAX5033BUSA+ operation?
Four components are mandatory: (1) input bypass capacitor (≥47μF low-ESR aluminum or ceramic), (2) output filter capacitor (≥33μF low-ESR), (3) 0.1μF ceramic capacitor between BST and LX, and (4) Schottky rectifier (e.g., 50SQ100) from LX to GND. Inductor value (220µH typical) and optional ON/OFF pull-up resistor complete the minimal BOM.
MAX5033BUSA+ 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):
- 5V
- 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
MAX5033BUSA+ FAQ
1.How can I place an order for MAX5033BUSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5033BUSA+ 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 MAX5033BUSA+ reliable?
The price and inventory of MAX5033BUSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5033BUSA+ is usually 5 days.
3.What payment methods are accepted for MAX5033BUSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5033BUSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5033BUSA+?
MAX5033BUSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5033BUSA+ 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 MAX5033BUSA+?
For technical support, including MAX5033BUSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5033BUSA+ requirements.
6.How does Aetrix verify that MAX5033BUSA+ is sourced from the original manufacturer or authorized distributors?
All MAX5033BUSA+ 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 MAX5033BUSA+ meets industry standards.
7.What is the process for return or replacement of MAX5033BUSA+?
All MAX5033BUSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5033BUSA+, 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 MAX5033BUSA+ part is unused and in its original packaging.
Return procedure for MAX5033BUSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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