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Analog Devices Inc./Maxim Integrated MAX5033CUSA+
- Part No.:
- MAX5033CUSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5033CUSA+.pdf
- Description:
- IC REG BUCK 12V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:551
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Product details
Overview
The MAX5033CUSA+ from Maxim Integrated is a high-voltage, fixed-output 12V step-down DC-DC converter with integrated 0.4Ω high-side DMOS FET, operating from 15V to 76V input and delivering up to 500mA output current. It features 125kHz fixed-frequency PWM operation, pulse-skipping mode for light-load efficiency, 270μA no-load quiescent current, and built-in thermal shutdown and hiccup-mode short-circuit protection-ideal for industrial power rails requiring robust 12V regulation in space-constrained SO-8 designs.
For engineers reviewing the MAX5033CUSA+ datasheet, MAX5033CUSA+ pinout, MAX5033CUSA+ application, or MAX5033CUSA+ equivalent, this page delivers verified technical context, package-specific design meaning, real-world application constraints (e.g., VIN ≥15V minimum, 12V ±3.5% tolerance at 20–500mA), and validated alternative options for 12V buck conversion in automotive-grade temperature environments.
Technical Context
The MAX5033CUSA+ implements voltage-mode control with feed-forward compensation and internal Type-3 compensation network, eliminating external compensation components. Its integrated high-side DMOS switch and bootstrap gate drive (BST pin) enable efficient high-voltage buck conversion without external MOSFET drivers.
It operates in fixed-frequency PWM mode above ~65mA load and automatically transitions to pulse-skipping mode below that threshold-reducing switching losses while maintaining regulation. Undervoltage lockout activates at 5.2V (typ) on VIN, and ON/OFF control provides 1.69V rising-edge shutdown threshold with 100mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 15V to 76V - requires minimum 15V input; not functional below 15V (per MAX5033C-specific spec) |
| Output Voltage | 12V ±3.5% (11.64V–12.36V) at 20–500mA load - fixed internal feedback; no external resistor divider needed |
| Max Output Current | 500mA - limited by thermal dissipation in SO-8 package (471mW @ +70°C) |
| Switching Frequency | 125kHz (109–135kHz range) - fixed oscillator enables predictable EMI filtering and inductor selection |
| Quiescent Current | 270μA (typ) at no load - enables low-power standby in always-on industrial systems |
| Shutdown Current | 10μA (typ) - allows deep-sleep power management via ON/OFF pin control |
| Internal Switch RDS(ON) | 0.4Ω (typ) - reduces conduction loss and simplifies BOM vs. external high-voltage MOSFET solutions |
Pinout & Package
MAX5033CUSA+ is housed in an 8-pin SO (Small Outline) package with exposed pad for thermal enhancement. Pin 1 is BST; pin 6 is GND; pin 7 is VIN; pin 8 is LX. The SO package has θJA = 170°C/W and supports operation from 0°C to +85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 1) | Bootstrap capacitor connection | Must connect 0.1μF ceramic cap between BST and LX to generate gate drive for internal high-side DMOS; critical for startup and duty cycle >50% |
| VD (Pin 2) | Internal regulator output | Provides ~7.8V regulated supply for internal analog circuitry; bypass to GND with 0.1μF ceramic cap |
| SGND (Pin 3) | Signal ground reference | Internally connected to GND; must be tied to system ground plane to ensure stable feedback and regulation |
| FB (Pin 4) | Feedback sense input | Internally connected to 12V output; no external resistors required-fixed 12V version uses internal divider |
| ON/OFF (Pin 5) | Enable/shutdown control | Pull low (<1.53V) to disable; pull high (>1.85V) to enable; 10nA input bias enables direct MCU GPIO control |
| GND (Pin 6) | Power ground return | Main power return path for LX switch, VD regulator, and internal logic; must be low-impedance star-ground connection |
| VIN (Pin 7) | Main input supply | Accepts 15–76V DC; requires local low-ESR bulk capacitor (e.g., 47μF aluminum + 0.1μF ceramic) placed near pin |
| LX (Pin 8) | Switch node | Connects to inductor and Schottky diode cathode; high dv/dt node-requires tight layout and short traces |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.4Ω high-side DMOS FET | Eliminates need for external high-voltage MOSFET and driver, reducing solution size and component count |
| Internal Type-3 compensation | Enables stable closed-loop operation with standard LC filter without external compensation network |
| Automatic pulse-skipping mode | Maintains >85% efficiency down to ~10mA load, extending battery life in intermittent-duty applications |
| Hiccup-mode short-circuit protection | Shuts down and auto-restarts during sustained overload-prevents thermal runaway without manual reset |
| Thermal shutdown with 20°C hysteresis | Triggers at +160°C junction temp and resumes at +140°C-enables self-recovery under transient overloads |
Applications
| Industrial Sensor Power Supply | Rail-to-Rail Process Controller |
|---|---|
Use Scenario: Powering 12V analog sensors (e.g., 4–20mA transmitters, RTD conditioners) in factory-floor PLC I/O modules with wide-input 24/48V DC distribution. IC Role / Device Role / Timing Role: Primary 12V point-of-load regulator converting unregulated 24–48V bus to clean, stable 12V rail with <±3.5% line/load regulation. Use Value: Delivers 500mA at 94% efficiency (VIN=24V), enabling compact PCB layout and eliminating need for heatsinking in sealed enclosures. | Use Scenario: Providing regulated 12V supply to microcontroller-based process controllers operating from variable 15–76V field wiring (e.g., solar-charged battery banks, legacy 48V telecom systems). IC Role / Device Role / Timing Role: High-voltage buck converter with ON/OFF control enabling firmware-initiated power cycling and low-quiescent sleep modes. Use Value: 10μA shutdown current and 270μA no-load IQ allow multi-year battery backup operation when paired with supercapacitors. |
| Automotive Body Control Module | Outdoor LED Driver Auxiliary Rail |
Use Scenario: Generating 12V auxiliary rail in BCMs powered from vehicle battery (9–16V nominal, up to 76V load-dump transients). IC Role / Device Role / Timing Role: Input-tolerant step-down regulator with UVLO (5.2V) and thermal protection-survives cold-crank and load-dump events. Use Value: Withstands 76V input transients and maintains regulation across -40°C to +85°C ambient-no derating required in engine bay proximity. | Use Scenario: Powering gate drivers and bias supplies in outdoor LED streetlight drivers where main DC bus ranges from 36V to 72V (e.g., 48V nominal with PV boost). IC Role / Device Role / Timing Role: Isolated 12V auxiliary supply decoupled from high-current LED string switching noise. Use Value: Internal compensation and low EMI 125kHz switching simplify compliance with EN55015 Class B; SO-8 footprint fits tight thermal zones. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12V buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5008AMM/NOPB | Fixed 12V output; 75V max input; 500mA; 1MHz switching; no internal compensation - requires external RC network | Higher frequency enables smaller magnetics but increases EMI sensitivity; lacks hiccup-mode protection | Choose LM5008AMM/NOPB only if board area is constrained and EMI filtering is already implemented |
| TPS54340DDAR | Adjustable output (1.22V–58V); 40V max input; 3.5A; 3.5MHz; external compensation; no integrated high-side FET | Requires external 40V MOSFET; unsuitable for 76V input; higher current capability irrelevant for 500mA use case | TPS54340DDAR is not a drop-in replacement-requires redesign of power stage and compensation |
Compared with LM5008AMM/NOPB and TPS54340DDAR, the MAX5033CUSA+ offers plug-and-play 12V regulation with no external compensation, 76V input tolerance, and integrated hiccup-mode protection-making it optimal for cost-sensitive, thermally constrained industrial 12V point-of-load designs where reliability trumps raw current headroom.
Availability
MAX5033CUSA+ is available at Aetrix Electronics and suitable for industrial sensor power supplies, automotive body control modules, outdoor LED driver auxiliary rails, and distributed power systems requiring stable component supply across extended temperature and high-input-voltage conditions.
Supply support for MAX5033CUSA+ 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 family was engineered specifically for high-input-voltage, space-constrained DC-DC conversion in harsh environments-emphasizing integration (internal FET, compensation), fault resilience (hiccup, thermal, UVLO), and ease of use (fixed outputs, SO-8 packaging).
FAQ
What is the minimum input voltage required for the MAX5033CUSA+ to regulate 12V output?
The MAX5033CUSA+ requires a minimum input voltage of 15V to maintain 12V regulation across its full 20–500mA load range, as specified in the Electrical Characteristics table for MAX5033C variants. Operation below 15V may result in dropout or regulation failure-even though the absolute maximum rating allows VIN down to -0.3V, the functional minimum is 15V per datasheet test conditions.
Does the MAX5033CUSA+ require external compensation components?
No, the MAX5033CUSA+ includes an internal Type-3 compensation network optimized for stability with standard LC output filters. External compensation is neither required nor recommended-adding external components may destabilize the control loop. This integration simplifies design and reduces bill-of-materials cost compared to controllers requiring external compensation networks.
Can the MAX5033CUSA+ be used in automotive applications with load-dump transients?
Yes, the MAX5033CUSA+ is rated for 76V absolute maximum input voltage and includes undervoltage lockout and thermal shutdown-making it suitable for automotive body electronics subject to ISO 7637-2 Load Dump (up to 60V, 100ms). Its 12V fixed output and SO-8 package meet requirements for non-safety-critical 12V auxiliary rails in BCMs and lighting modules.
What is the purpose of the SGND pin on the MAX5033CUSA+?
The SGND (Signal Ground) pin on the MAX5033CUSA+ is an internal connection to the device's analog ground reference, separate from power ground paths. It must be tied directly to the system ground plane to ensure accurate feedback sensing and stable regulation-floating or improperly routed SGND causes output voltage drift and instability, especially under dynamic load conditions.
How does the MAX5033CUSA+ handle short-circuit conditions on its output?
The MAX5033CUSA+ employs hiccup-mode short-circuit protection: upon detecting overcurrent, it shuts down the internal switch, waits ~300ms, then attempts restart. If the fault persists, it repeats the cycle-limiting average power dissipation and preventing thermal damage. This behavior is confirmed in the "Detailed Description" section and distinguishes it from latch-off or constant-current limiting schemes found in other buck regulators.
MAX5033CUSA+ 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:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 15V
- Voltage - Input (Max):
- 76V
- Voltage - Output (Min/Fixed):
- 12V
- 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
MAX5033CUSA+ FAQ
1.How can I place an order for MAX5033CUSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5033CUSA+ 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 MAX5033CUSA+ reliable?
The price and inventory of MAX5033CUSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5033CUSA+ is usually 5 days.
3.What payment methods are accepted for MAX5033CUSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5033CUSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5033CUSA+?
MAX5033CUSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5033CUSA+ 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 MAX5033CUSA+?
For technical support, including MAX5033CUSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5033CUSA+ requirements.
6.How does Aetrix verify that MAX5033CUSA+ is sourced from the original manufacturer or authorized distributors?
All MAX5033CUSA+ 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 MAX5033CUSA+ meets industry standards.
7.What is the process for return or replacement of MAX5033CUSA+?
All MAX5033CUSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5033CUSA+, 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 MAX5033CUSA+ part is unused and in its original packaging.
Return procedure for MAX5033CUSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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