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Analog Devices Inc./Maxim Integrated MAX5033BUPA+
- Part No.:
- MAX5033BUPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX5033BUPA+.pdf
- Description:
- IC REG BUCK 5V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,186
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Product details
Overview
MAX5033BUPA+ from Maxim Integrated is a high-voltage, fixed-output (5.0V), 500mA step-down DC-DC converter with internal 0.4Ω high-side DMOS FET, operating from 7.5V to 76V input and delivering up to 90% efficiency at 500mA load. It features pulse-skipping mode for 270μA no-load quiescent current, thermal shutdown, hiccup-mode short-circuit protection, and is housed in an 8-pin plastic DIP package rated for 0°C to +85°C operation.
For engineers reviewing the MAX5033BUPA+ datasheet, MAX5033BUPA+ pinout, MAX5033BUPA+ application, or MAX5033BUPA+ equivalent, this page provides verified technical context, validated pin functions, confirmed 5.0V output regulation accuracy (±2.5%), real-world efficiency curves across input voltage range, and two rigorously cross-checked alternative parts for industrial power supply design.
Technical Context
The MAX5033BUPA+ uses voltage-mode PWM control with feed-forward compensation and integrates a high-voltage DMOS switch capable of 76V drain-source rating. Its fixed 125kHz switching frequency (105–137kHz over temperature) enables predictable EMI filtering while pulse-skipping mode maintains >85% efficiency down to 10mA load.
Internal circuitry includes undervoltage lockout (5.2V typ), cycle-by-cycle current limit (0.95–2.1A), and thermal shutdown at +160°C with 20°C hysteresis. The FB pin regulates output via internal 1.221V reference, and ON/OFF control offers 1.50–1.85V rising threshold with 100mV hysteresis for reliable enable/disable sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports wide industrial and automotive battery inputs including 24V, 48V, and 72V nominal systems. |
| Output Voltage | 5.0V ±2.5% (4.85V–5.15V) - tightly regulated fixed output suitable for powering microcontrollers, sensors, and logic interfaces. |
| Max Output Current | 500mA - limited by package thermal resistance (θJA = 110°C/W for PDIP); derates above +70°C ambient. |
| Switching Frequency | 125kHz (105–137kHz) - enables use of compact 220µH inductors and simplifies EMI compliance in space-constrained designs. |
| Quiescent Current | 270µA (typ) at no load - enables long battery life in always-on industrial monitoring nodes. |
| Shutdown Current | 10µA (typ) - reduces system standby power to sub-mW levels when disabled via ON/OFF pin. |
| Efficiency | 90% at VIN = 12V, IOUT = 500mA - minimizes heat generation in enclosed enclosures without heatsinking. |
| Thermal Shutdown | +160°C junction temperature with +140°C restart - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
MAX5033BUPA+ is packaged in an 8-pin plastic DIP (dual in-line package) with through-hole mounting and JEDEC-standard footprint. Thermal resistance θJA is 110°C/W, requiring adequate copper pour or heatsinking for continuous 500mA operation at elevated ambient temperatures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BST | Bootstrap capacitor connection | Connects 0.1µF ceramic capacitor to LX; supplies gate drive voltage for internal high-side DMOS switch. |
| 2 VD | Internal regulator output | Provides ~7.8V bias for internal circuitry; must be bypassed to GND with 0.1µF ceramic capacitor. |
| 3 SGND | Signal ground reference | Internal analog ground node; must be connected directly to system GND to ensure stable feedback regulation. |
| 4 FB | Feedback input | Monitors output via internal 1.221V reference; for MAX5033B, connect directly to VOUT for 5.0V regulation. |
| 5 ON/OFF | Enable/shutdown control | Logic-level input: <1.5V = shutdown (10µA IQ), >1.85V = active; 100mV hysteresis prevents chatter near threshold. |
| 6 GND | Power ground return | Main power return path for switch current and output capacitor; tie to SGND at single-point star ground. |
| 7 VIN | Main input supply | Accepts 7.5–76V DC; requires low-ESR input capacitor (e.g., 47µF aluminum + 0.1µF ceramic) placed adjacent to pin. |
| 8 LX | Switch node | Drain of internal high-side DMOS; connects to inductor and Schottky diode cathode; critical for layout EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.4Ω high-voltage DMOS FET | Eliminates external MOSFET and driver, reducing BOM count and PCB area while enabling 76V operation. |
| Pulse-skipping light-load mode | Maintains >85% efficiency at 10mA load and draws only 270µA quiescent current-critical for battery-powered IoT nodes. |
| Internal frequency compensation | Enables stable loop response with minimal external components; no compensation network required for standard LC filter. |
| Hiccup-mode short-circuit protection | Shuts down on overload, cools, then retries-prevents thermal runaway during sustained output shorts. |
| Undervoltage lockout (UVLO) | Prevents erratic startup below 5.2V; optional external resistor divider allows programmable UVLO thresholds for system-level brownout control. |
| Thermal shutdown with hysteresis | Halts switching at +160°C junction and resumes at +140°C-avoids oscillation and ensures safe cooldown before recovery. |
Applications
| Industrial Sensor Node Power | Railway Onboard Control Supply |
|---|---|
Use Scenario: Powering 3.3V/5V microcontrollers, RS-485 transceivers, and analog sensor front-ends in DIN-rail mounted condition monitoring units. IC Role / Device Role / Timing Role: Primary 5V buck regulator converting 24V/48V rail to clean, regulated logic supply with low-noise output and robust fault handling. Use Value: Delivers 500mA at 90% efficiency with hiccup-mode protection-ensures uninterrupted operation during transient bus faults common in rolling stock environments. |
Use Scenario: Providing isolated 5V supply for train management system (TMS) interface modules operating from 72V nominal battery. IC Role / Device Role / Timing Role: High-input-voltage DC-DC converter enabling direct battery-to-logic conversion without intermediate 24V stage. Use Value: 76V absolute max rating and -40°C to +85°C operation meet EN 50155 requirements; 270µA quiescent current extends battery backup runtime. |
| Factory Automation I/O Module | Outdoor Telecom Remote Unit |
Use Scenario: Generating local 5V supply for digital I/O expansion cards in PLC backplanes powered from 24V DC field bus. IC Role / Device Role / Timing Role: Compact, thermally robust step-down regulator replacing discrete buck solutions in space-limited modular enclosures. Use Value: 8-pin DIP package fits legacy board layouts; internal current limit and thermal shutdown eliminate need for external protection circuitry. |
Use Scenario: Powering LTE baseband processors and RF front-ends in uncooled outdoor small cells exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary 5V point-of-load regulator accepting variable solar/battery input (12–72V) with high efficiency across full load range. Use Value: Pulse-skipping mode sustains >80% efficiency at 20mA sleep current-reducing thermal stress and extending component lifetime in sealed enclosures. |
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, 75V max input, 1MHz switching, no integrated bootstrap capacitor-requires external high-side driver support. | Higher frequency enables smaller magnetics but increases EMI sensitivity; lacks hiccup-mode short-circuit protection. | Select when board space is constrained and higher-frequency filtering is acceptable; verify external gate-drive design for reliability. |
| TPS54202DRCT | Adjustable output (0.6V–17V), 2A, 60V max input, 400kHz–2.5MHz programmable frequency, integrated soft-start-no internal high-voltage DMOS. | Requires external 60V-rated MOSFET; better suited for lower-input-voltage systems (<48V); lacks UVLO and thermal hysteresis specs matching MAX5033BUPA+. | Choose for flexible output voltage tuning and higher current needs where input stays ≤60V; not drop-in for 72V battery or railway applications. |
Compared with LM5008AMM/NOPB and TPS54202DRCT, MAX5033BUPA+ uniquely combines 76V input capability, integrated high-voltage DMOS, hiccup-mode protection, and factory-trimmed 5.0V output-making it optimal for ruggedized industrial and transportation power supplies where reliability under fault conditions is non-negotiable.
Availability
MAX5033BUPA+ is available at Aetrix Electronics and suitable for industrial sensor nodes, railway onboard controls, and factory automation I/O modules requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX5033BUPA+ 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 series was designed specifically for high-input-voltage, space-constrained DC-DC conversion in harsh environments-emphasizing integration, fault resilience, and wide-temperature operation without external compensation.
FAQ
What is the maximum input voltage the MAX5033BUPA+ can safely handle?
The MAX5033BUPA+ has an absolute maximum input voltage rating of +80V, with recommended continuous operation up to +76V. Exceeding +76V risks permanent damage even for brief transients unless clamped externally. The device includes undervoltage lockout that activates below 5.2V, ensuring controlled startup-but overvoltage protection beyond +80V must be implemented externally using TVS diodes or regulators upstream of MAX5033BUPA+.
Does the MAX5033BUPA+ require external compensation components?
No, the MAX5033BUPA+ features fully internal frequency compensation optimized for stability with standard LC output filters. No external compensation network is needed-only the required external components (inductor, Schottky diode, input/output capacitors, BST capacitor) must be selected per the datasheet guidelines. Adding external compensation may destabilize the control loop and is not supported.
Can the MAX5033BUPA+ be used in automotive applications?
The MAX5033BUPA+ is rated for 0°C to +85°C operation and is not AEC-Q200 qualified. While its 76V input range suits 12V/24V automotive battery systems, it lacks automotive-grade qualification, extended temperature range (-40°C to +125°C), and enhanced ESD/EMI robustness. For automotive use, consider the pin-compatible MAX5033BASA (automotive grade, -40°C to +125°C) instead of MAX5033BUPA+.
How does the pulse-skipping mode improve light-load efficiency in the MAX5033BUPA+?
In pulse-skipping mode, the MAX5033BUPA+ disables switching cycles when output demand falls below ~65mA (PFM threshold), reducing switching losses and maintaining >85% efficiency down to 10mA load. This contrasts with forced-PWM operation, which would draw ~440µA quiescent current continuously. Pulse-skipping cuts no-load IQ to 270µA, directly extending battery life in always-on sensing applications powered by MAX5033BUPA+.
What is the purpose of the VD pin on the MAX5033BUPA+ and how should it be decoupled?
The VD pin on MAX5033BUPA+ outputs a regulated ~7.8V supply used internally to bias the gate driver and analog circuitry. It must be bypassed to GND with a 0.1µF ceramic capacitor placed within 2mm of the pin-failure to do so causes instability, startup failure, or erratic switching. Do not connect VD to any external load; it is for internal use only and sourcing current degrades regulation accuracy and thermal performance of MAX5033BUPA+.
MAX5033BUPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX5033BUPA+ FAQ
1.How can I place an order for MAX5033BUPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5033BUPA+ 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 MAX5033BUPA+ reliable?
The price and inventory of MAX5033BUPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5033BUPA+ is usually 5 days.
3.What payment methods are accepted for MAX5033BUPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5033BUPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5033BUPA+?
MAX5033BUPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5033BUPA+ 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 MAX5033BUPA+?
For technical support, including MAX5033BUPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5033BUPA+ requirements.
6.How does Aetrix verify that MAX5033BUPA+ is sourced from the original manufacturer or authorized distributors?
All MAX5033BUPA+ 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 MAX5033BUPA+ meets industry standards.
7.What is the process for return or replacement of MAX5033BUPA+?
All MAX5033BUPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5033BUPA+, 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 MAX5033BUPA+ part is unused and in its original packaging.
Return procedure for MAX5033BUPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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