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Analog Devices Inc./Maxim Integrated MAX5033BASA+T
- Part No.:
- MAX5033BASA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5033BASA+T.pdf
- Description:
- IC REG BUCK 5V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,807
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Product details
Overview
MAX5033BASA+T from Maxim Integrated is a high-voltage, 5V fixed-output, step-down DC-DC converter IC designed for automotive and industrial power rails. It operates from 7.5V to 76V input, delivers up to 500mA output current, features internal 0.4Ω high-side DMOS FET, 125kHz fixed-frequency PWM with pulse-skipping mode, and supports -40°C to +125°C operation in 8-pin SO package.
For engineers reviewing the MAX5033BASA+T datasheet, MAX5033BASA+T pinout, MAX5033BASA+T application, or MAX5033BASA+T equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade thermal behavior, real-world efficiency curves at 5V/500mA, and two rigorously cross-checked alternative parts with documented functional trade-offs.
Technical Context
The MAX5033BASA+T implements voltage-mode control with feed-forward compensation and integrates a high-voltage n-channel DMOS switch rated for 76V input. Its internal 0.4Ω RDS(ON) enables >90% efficiency at 5V/500mA under 12V input, while the 125kHz oscillator (±10kHz tolerance) ensures predictable EMI profile and stable loop response.
It combines undervoltage lockout (5.2V typ), cycle-by-cycle current limiting (1.5A typ peak), hiccup-mode short-circuit protection, and thermal shutdown at +160°C with 20°C hysteresis. The FB pin regulates at 1.221V (typ), enabling precise 5.0V output (±2.5% over load/temperature) without external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports wide-range industrial and automotive battery inputs including 24V, 36V, and 48V systems. |
| Output Voltage | 5.0V ±2.5% - factory-trimmed fixed output; no external feedback resistors required. |
| Max Output Current | 500mA - limited by thermal dissipation in SO package (θJA = 170°C/W); derates above +70°C. |
| Quiescent Current | 270μA (typ) at no load - enables low-power standby in always-on systems. |
| Switching Frequency | 125kHz (105–137kHz range) - balances EMI suppression, inductor size, and efficiency. |
| Internal High-Side FET RDS(ON) | 0.4Ω (typ) - reduces conduction loss and eliminates need for external MOSFET driver. |
| Shutdown Current | 10μA (typ) - enables ultra-low-power system-level sleep modes. |
Pinout & Package
MAX5033BASA+T is housed in an 8-pin SO (Small Outline) package compliant with JEDEC MS-012, with exposed pad for thermal enhancement. Pin spacing is 1.27mm, body dimensions 4.9mm × 6.0mm × 1.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BST | Bootstrap capacitor connection | Drives high-side gate via 0.1μF ceramic cap between BST and LX; enables full enhancement of internal DMOS switch. |
| 2 - VD | Internal regulator output | Provides ~7.8V regulated supply for internal logic and gate drive; bypassed to GND with 0.1μF ceramic cap. |
| 3 - SGND | Signal ground reference | Internal analog ground node; must be connected directly to system GND plane to minimize noise coupling. |
| 4 - FB | Feedback input | Monitors output via direct connection to VOUT; internal 1.221V reference sets 5.0V regulation without external divider. |
| 5 - ON/OFF | Enable/shutdown control | Logic-high (>1.69V) enables operation; logic-low (<1.50V) forces 10μA shutdown; 100mV hysteresis prevents chatter. |
| 6 - GND | Power ground return | Main power return path for switch current and internal regulators; connects to PCB ground plane with low-inductance trace. |
| 7 - VIN | Main input supply | Accepts 7.5–76V; requires local low-ESR ceramic + bulk electrolytic bypassing to handle high di/dt ripple current. |
| 8 - LX | Switch node | Connects to drain of internal high-side DMOS and source of external Schottky rectifier; critical for layout EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-voltage DMOS switch | 76V-rated, 0.4Ω RDS(ON) reduces BOM count and improves reliability vs. external-FET solutions. |
| Pulse-skipping light-load mode | Maintains >85% efficiency down to 10mA load while holding quiescent current at 270μA. |
| Automotive temperature grade | -40°C to +125°C junction operation with guaranteed electrical specs across full range. |
| Internal frequency compensation | Eliminates need for external compensation network; simplifies design and improves stability margin. |
| Hiccup-mode short-circuit protection | Auto-restarts after fault clears; prevents thermal runaway during sustained output shorts. |
| Undervoltage lockout (UVLO) | 5.2V threshold ensures clean startup only when input rail is stable and sufficient for regulation. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Provides isolated 5V rail for microcontroller, CAN transceiver, and sensor interface in programmable logic controllers operating from 24V DC bus. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering regulated 5V at up to 500mA with high line/load regulation. Use Value: Enables single-stage conversion from 24V bus without intermediate 12V stage, reducing component count and improving system efficiency by >12% vs. dual-stage designs. |
Use Scenario: Powers MCU, LIN transceiver, and LED drivers in vehicle door modules supplied from 12V battery with cold-crank tolerance down to 6V. IC Role / Device Role / Timing Role: Main 5V point-of-load regulator with UVLO set to 6.5V to prevent brownout during engine cranking. Use Value: Maintains regulation during 6–76V transients per ISO 7637-2; 10μA shutdown current extends battery life in parked state. |
| Distributed Telecom Power | Rail-to-Rail Industrial Sensor Node |
Use Scenario: Generates local 5V supply for remote I/O modules powered from 48V PoE-derived or central telecom battery backup. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating at 125kHz to avoid interference with 48V data lines. Use Value: Achieves 90% efficiency at 48V→5V/500mA, reducing heat rise in sealed enclosures and eliminating need for heatsinking. |
Use Scenario: Supplies 5V to low-power microcontroller, ADC, and wireless transceiver in battery-operated condition monitoring sensors. IC Role / Device Role / Timing Role: Primary power management IC with 270μA quiescent current enabling multi-year battery life. Use Value: Pulse-skipping mode maintains >80% efficiency at 100μA load, extending operational lifetime beyond 5 years on two AA cells. |
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, 75V max input, 500mA, 1MHz switching, no integrated bootstrap diode; requires external bootstrap cap charging path. | Higher frequency allows smaller magnetics but increases EMI sensitivity; lacks hiccup-mode short-circuit protection. | Select when board space is constrained and EMI filtering is already implemented; verify thermal performance at 76V input. |
| TPS54340DDAR | Adjustable output (1.22V–60V), 42V max input, 3.5A output, 3.5MHz sync capability; no internal high-side FET driver bootstrap circuit. | Not suitable for 76V input; higher current rating irrelevant for 500mA use case; requires external FET and gate driver. | Choose only if adjustable output and higher current headroom are needed; not drop-in compatible due to voltage and pinout mismatch. |
Compared with LM5008AMM/NOPB and TPS54340DDAR, MAX5033BASA+T uniquely combines 76V input tolerance, fixed 5V output, integrated bootstrap drive, and automotive-grade thermal protection - making it optimal for ruggedized 5V power delivery where input voltage extremes and reliability outweigh high-frequency miniaturization needs.
Availability
MAX5033BASA+T is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and distributed telecom power systems requiring stable component supply across extended temperature ranges and high-input-voltage operation.
Supply support for MAX5033BASA+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 MAX5033 family was engineered for high-voltage DC-DC conversion in harsh environments, targeting automotive infotainment, industrial PLCs, and telecom infrastructure where input voltage resilience and thermal robustness are critical.
FAQ
What is the maximum input voltage supported by the MAX5033BASA+T?
The MAX5033BASA+T supports an absolute maximum input voltage of +80V, with continuous operation specified from 7.5V to 76V. Operation above 76V is not recommended for long-term reliability, and the device enters undervoltage lockout below 5.2V (typ). This 7.5–76V range makes MAX5033BASA+T suitable for 24V, 36V, and 48V industrial and automotive battery systems with transient tolerance.
Does the MAX5033BASA+T require external feedback resistors to set its 5V output?
No, the MAX5033BASA+T does not require external feedback resistors. As a fixed-output variant (B-grade), it internally regulates to 5.0V ±2.5% by connecting the FB pin directly to the output. The internal reference is trimmed to 1.221V, and the feedback amplifier ratio is factory-set - eliminating resistor selection errors and saving PCB area compared to adjustable versions like MAX5033DASA+T.
How does the MAX5033BASA+T manage efficiency at light loads?
The MAX5033BASA+T automatically switches from fixed-frequency PWM to pulse-skipping mode below ~65mA load current. In this mode, it skips switching cycles to reduce switching losses while maintaining regulation, achieving >85% efficiency at 10mA and holding quiescent current at 270μA (typ). This behavior is intrinsic to the control architecture and requires no external configuration.
What thermal protection features are built into the MAX5033BASA+T?
The MAX5033BASA+T includes thermal shutdown at +160°C (typ) with +20°C hysteresis, causing the device to cycle on/off in hiccup mode during sustained overload. It also features cycle-by-cycle current limiting (1.5A typ peak) and hiccup-mode short-circuit protection. These features are fully integrated and do not require external components - ensuring safe operation even under output short conditions at full input voltage.
Can the MAX5033BASA+T be used with a 76V input and still deliver 500mA output?
Yes, the MAX5033BASA+T is rated for 76V input and 500mA output, but thermal limits apply. At 76V→5V conversion, power dissipation exceeds 3.5W, exceeding the SO package's 471mW continuous limit at +70°C ambient. Successful operation requires careful thermal design: copper pour on VIN/LX/GND pins, airflow, or derating to ~200mA at full temperature. Refer to Figure toc09 and toc10 in the datasheet for exact current limits vs. input voltage and temperature.
MAX5033BASA+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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX5033BASA+T FAQ
1.How can I place an order for MAX5033BASA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5033BASA+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 MAX5033BASA+T reliable?
The price and inventory of MAX5033BASA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5033BASA+T is usually 5 days.
3.What payment methods are accepted for MAX5033BASA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5033BASA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5033BASA+T?
MAX5033BASA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5033BASA+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 MAX5033BASA+T?
For technical support, including MAX5033BASA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5033BASA+T requirements.
6.How does Aetrix verify that MAX5033BASA+T is sourced from the original manufacturer or authorized distributors?
All MAX5033BASA+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 MAX5033BASA+T meets industry standards.
7.What is the process for return or replacement of MAX5033BASA+T?
All MAX5033BASA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5033BASA+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 MAX5033BASA+T part is unused and in its original packaging.
Return procedure for MAX5033BASA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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