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Analog Devices Inc./Maxim Integrated MAX5033BUSA+T
- Part No.:
- MAX5033BUSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5033BUSA+T.pdf
- Description:
- IC REG BUCK 5V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,440
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Product details
Overview
The MAX5033BUSA+T from Maxim Integrated is a high-voltage, fixed-output (5.0V), 500mA step-down DC-DC converter operating from 7.5V to 76V input, featuring internal 0.4Ω high-side DMOS FET, 125kHz fixed-frequency PWM with pulse-skipping at light loads, and integrated thermal shutdown - used in industrial power supplies requiring wide-input, low-quiescent-current regulation.
For engineers reviewing the MAX5033BUSA+T datasheet, MAX5033BUSA+T pinout, MAX5033BUSA+T application, or MAX5033BUSA+T equivalent, this page delivers verified technical context, package-specific pin functions, real-world load-transient behavior, efficiency vs. input voltage curves, and validated alternative parts for 5V distributed power designs.
Technical Context
This voltage-mode buck regulator uses feed-forward control and internal compensation to maintain stable 5.0V output across 7.5–76V input range while delivering up to 500mA. It integrates a high-voltage DMOS switch (RDS(ON) = 0.4Ω typ) and internal 7.8V bias regulator (VD) for gate drive.
Operation includes undervoltage lockout (UVLO = 5.2V typ), cycle-by-cycle current limiting (ILIM = 0.95–2.1A), hiccup-mode short-circuit protection, and thermal shutdown at +160°C with 20°C hysteresis. Shutdown current is 10μA (typ), and no-load quiescent current is 270μA (typ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports wide industrial bus rails including 24V, 48V, and PoE++/HVDC systems without external pre-regulation. |
| Output Voltage | 5.0V ±2.5% (4.85–5.15V) - tightly regulated fixed output suitable for powering logic, sensors, and interface ICs. |
| Max Output Current | 500mA - limited by thermal dissipation in SO-8 package (θJA = 170°C/W); derates above +70°C ambient. |
| Switching Frequency | 125kHz (109–137kHz over temp) - enables use of compact 220µH inductors and reduces EMI compared to MHz-range converters. |
| Quiescent Current | 270μA (typ) at no load - minimizes standby power loss in always-on industrial monitoring nodes. |
| Shutdown Current | 10μA (typ) - enables ultra-low-power system-level sleep modes without external disconnect circuitry. |
| Internal Switch RDS(ON) | 0.4Ω (typ) - reduces conduction loss and improves full-load efficiency up to 90% at 12VIN/5VOUT. |
Pinout & Package
MAX5033BUSA+T is housed in an 8-pin SO (Small Outline) package, JEDEC MS-012AC, with exposed pad not electrically connected. Thermal resistance θJA = 170°C/W (JEDEC 51). Pin 1 marked by beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BST | Bootstrap capacitor connection | Connects 0.1µF ceramic cap between BST and LX to generate gate drive voltage for internal high-side DMOS switch. |
| 2 - VD | Internal bias regulator output | Provides ~7.8V regulated supply for gate driver; bypass to GND with 0.1µF ceramic capacitor near pin. |
| 3 - SGND | Signal ground reference | Internal analog ground node; must be tied directly to system GND plane to avoid feedback loop instability. |
| 4 - FB | Feedback input (5V fixed) | Internally connected to 5V output; no external divider required - simplifies layout and eliminates resistor tolerance error. |
| 5 - ON/OFF | Enable/shutdown control | Logic-high (>1.69V) enables operation; logic-low (<1.50V) disables switching and reduces IQ to 10μA. |
| 6 - GND | Power ground return | Main return path for high-current switch node; connect to star ground point with minimal trace length. |
| 7 - VIN | Main input supply | Accepts 7.5–76V; requires local low-ESR input capacitor (e.g., 47µF aluminum + 0.1µF ceramic) placed adjacent to pin. |
| 8 - LX | Switch node | Drives external inductor; connects internally to source of high-side DMOS; critical for EMI and thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-voltage DMOS switch | 0.4Ω RDS(ON) enables single-chip 500mA buck conversion up to 76V without external MOSFET or driver. |
| Auto pulse-skipping mode | Maintains >80% efficiency down to 1mA load while holding quiescent current at 270μA - ideal for intermittent-sensing applications. |
| Internal frequency compensation | Eliminates need for external compensation network; ensures stable operation with standard LC filter components (e.g., 220µH + 33µF). |
| Hiccup-mode short-circuit protection | Shuts down on overload, cools, then retries - prevents thermal runaway during sustained output faults without latch-up. |
| Wide temperature grade | Specified for 0°C to +85°C ambient (U-grade), matching commercial/industrial control cabinet environments. |
Applications
| Industrial PLC I/O Module Power | Railway Signaling Interface Supply |
|---|---|
|
Use Scenario: Powers isolated RS-485 transceivers and analog input conditioning circuits inside DIN-rail mounted PLC modules fed from 24V or 48V DC rails. IC Role / Device Role / Timing Role: Primary 5V local regulator converting unregulated field bus voltage; provides clean, low-noise supply independent of upstream switching noise. Use Value: 76V max input withstands 48V rail transients (IEC 61000-4-5); 270μA quiescent current extends battery backup runtime during AC loss. |
Use Scenario: Supplies 5V to microcontroller-based track occupancy detectors and LED status indicators in EN 50121-compliant signaling cabinets. IC Role / Device Role / Timing Role: Point-of-load regulator accepting variable traction power (24–72V) and delivering stable 5V under vibration, dust, and wide ambient swings. Use Value: -40°C to +85°C operation meets railway environmental specs; hiccup-mode protection avoids catastrophic failure during cable short events. |
| Smart Building HVAC Sensor Node | Automated Test Equipment (ATE) Auxiliary Rail |
|
Use Scenario: Powers Zigbee/Thread radio SoCs and temperature/humidity sensors in battery-backed wireless HVAC controllers powered from 12–48V building management buses. IC Role / Device Role / Timing Role: Efficient step-down regulator enabling multi-year battery life via ultra-low 270μA no-load draw and 10μA shutdown state. Use Value: Pulse-skipping preserves >85% efficiency at 100µA sensor bias current; SO-8 package fits space-constrained PCB layouts. |
Use Scenario: Generates 5V auxiliary rail for FPGA configuration, DAC bias, and digital logic in modular ATE mainframes using 28V or 48V backplane power. IC Role / Device Role / Timing Role: High-reliability secondary regulator with thermal shutdown and current limit - protects against DUT-induced shorts during probe contact failures. Use Value: Internal 0.4Ω switch eliminates discrete FET footprint and layout sensitivity; 90% peak efficiency reduces thermal load in dense chassis. |
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 5V output, 500mA, 8–75V input, 1MHz switching, no internal compensation - requires external RC network. | Higher frequency enables smaller magnetics but increases EMI filtering complexity; lower thermal robustness (no hiccup mode). | Choose LM5008AMM/NOPB only if board area is constrained and EMI filters are already present; MAX5033BUSA+T preferred for reliability-critical industrial use. |
| TPS54340DDAR | Adjustable 0.8–60V output, 3.5A, 3.5–42V input, 120kHz, integrated compensation, but lacks 76V rating and automotive temp range. | Cannot replace MAX5033BUSA+T in 48V+ or transient-heavy systems; higher current irrelevant for 500mA 5V loads. | Select TPS54340DDAR only when adjustable output and higher current headroom are needed; MAX5033BUSA+T remains optimal for fixed 5V, 76V-tolerant, low-IQ applications. |
Compared with LM5008AMM/NOPB and TPS54340DDAR, the MAX5033BUSA+T uniquely combines 76V absolute maximum input, integrated compensation, hiccup-mode fault recovery, and sub-300μA quiescent current - making it the most robust choice for fixed 5V industrial power where input transients, reliability, and standby power are design priorities.
Availability
MAX5033BUSA+T is available at Aetrix Electronics and suitable for industrial automation, railway signaling, and smart building sensor node designs requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for MAX5033BUSA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX5033BUSA+T belongs to Maxim's MAXPower™ family of high-voltage DC-DC converters, designed specifically for reliable, low-component-count power conversion in harsh industrial environments with wide input voltage ranges and stringent reliability requirements.
FAQ
What is the maximum input voltage rating for the MAX5033BUSA+T?
The MAX5033BUSA+T has an absolute maximum input voltage rating of +80V, with recommended continuous operation up to +76V. This allows safe operation across 24V, 48V, and 60V industrial bus systems, including transient surges per IEC 61000-4-5. Exceeding +80V risks permanent damage per Absolute Maximum Ratings.
Does the MAX5033BUSA+T require external compensation components?
No, the MAX5033BUSA+T features fully integrated Type III compensation, eliminating the need for external resistors or capacitors in the feedback loop. This simplifies design, improves production yield, and ensures stable regulation with standard 220µH inductors and 33µF output capacitors - as validated in Maxim's typical application circuit.
How does the MAX5033BUSA+T behave during output short-circuit conditions?
Under sustained output short-circuit, the MAX5033BUSA+T enters hiccup-mode protection: it shuts down the switch, waits for die temperature to fall below +140°C, then attempts restart. This cycle repeats indefinitely, preventing thermal runaway and enabling automatic recovery once the fault clears - unlike latch-off devices requiring manual reset.
Can the MAX5033BUSA+T be used in automotive applications?
The MAX5033BUSA+T is rated for 0°C to +85°C ambient (U-grade) and is not qualified for automotive AEC-Q100. For automotive use, select the MAX5033BASA variant, which operates from -40°C to +125°C and is qualified for under-hood environments. Using MAX5033BUSA+T outside its specified temperature range may cause parametric shift or premature failure.
What is the purpose of the VD pin on the MAX5033BUSA+T?
The VD pin on the MAX5033BUSA+T outputs a regulated ~7.8V supply used internally to drive the high-side DMOS gate. It must be bypassed to GND with a 0.1µF ceramic capacitor placed adjacent to the pin. This rail powers the bootstrap circuit and analog blocks - improper decoupling causes erratic switching or startup failure.
MAX5033BUSA+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):
- 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+T FAQ
1.How can I place an order for MAX5033BUSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5033BUSA+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 MAX5033BUSA+T reliable?
The price and inventory of MAX5033BUSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5033BUSA+T is usually 5 days.
3.What payment methods are accepted for MAX5033BUSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5033BUSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5033BUSA+T?
MAX5033BUSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5033BUSA+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 MAX5033BUSA+T?
For technical support, including MAX5033BUSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5033BUSA+T requirements.
6.How does Aetrix verify that MAX5033BUSA+T is sourced from the original manufacturer or authorized distributors?
All MAX5033BUSA+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 MAX5033BUSA+T meets industry standards.
7.What is the process for return or replacement of MAX5033BUSA+T?
All MAX5033BUSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5033BUSA+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 MAX5033BUSA+T part is unused and in its original packaging.
Return procedure for MAX5033BUSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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