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Analog Devices Inc./Maxim Integrated MAX5033AUPA+
- Part No.:
- MAX5033AUPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX5033AUPA+.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,188
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Product details
Overview
The MAX5033AUPA+ from Maxim Integrated is a high-voltage, fixed-output (3.3V), 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 mode, and 270μA no-load quiescent current. It delivers regulated 3.3V power in industrial distributed power systems where wide-input, high-reliability buck conversion is required.
For engineers reviewing the MAX5033AUPA+ datasheet, MAX5033AUPA+ pinout, MAX5033AUPA+ application, or MAX5033AUPA+ equivalent, this page provides verified technical context, package-specific thermal data, confirmed pin functions, real-world efficiency curves at 500mA load, and validated alternative options for 3.3V/500mA high-input-voltage buck conversion.
Technical Context
The MAX5033AUPA+ implements voltage-mode control with feed-forward compensation and integrates a high-voltage DMOS switch rated for 76V input. Its internal 0.4Ω RDS(ON) and 125kHz oscillator enable >86% efficiency at 12VIN/500mA/3.3VOUT, while pulse-skipping mode maintains 270μA quiescent current below ~65mA load.
It features undervoltage lockout (5.2V typ), cycle-by-cycle current limit (0.95–2.1A), hiccup-mode short-circuit protection, and thermal shutdown at +160°C with +20°C hysteresis. The 8-pin PDIP package has θJA = 110°C/W, supporting operation from 0°C to +85°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports direct connection to 24V, 48V, and 72V industrial bus rails without pre-regulation. |
| Output Voltage | 3.3V ±3.5% (3.185V–3.415V) - tightly regulated for powering 3.3V microcontrollers, sensors, and logic in harsh environments. |
| Max Output Current | 500mA - limited by package thermal dissipation (727mW at TA = +70°C in PDIP). |
| Switching Frequency | 125kHz (109–137kHz) - enables use of compact 220µH inductors and reduces EMI compared to higher-frequency alternatives. |
| Quiescent Current | 270µA (typ) at no load - extends battery life in always-on industrial monitoring nodes. |
| Shutdown Current | 10µA (typ) - enables ultra-low-power system-level sleep modes. |
| Internal Switch RDS(ON) | 0.4Ω (typ) - minimizes conduction loss and eliminates need for external high-voltage MOSFET. |
Pinout & Package
MAX5033AUPA+ uses an 8-pin plastic DIP (PDIP) package with through-hole mounting and JEDEC-standard thermal characteristics (θJA = 110°C/W). This package supports higher power dissipation than SO variants and simplifies prototyping and high-reliability industrial assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BST | Bootstrap capacitor node | Connects 0.1µF ceramic capacitor to LX to generate gate drive for internal high-side DMOS switch. |
| 2 VD | Internal regulator output | Provides ~7.8V bias for internal circuitry; bypass to GND with 0.1µF ceramic capacitor. |
| 3 SGND | Signal ground reference | Must be connected to system ground; separates analog sensing from power return paths. |
| 4 FB | Feedback input | Connected directly to VOUT for fixed 3.3V operation; senses output to regulate via internal 1.22V reference. |
| 5 ON/OFF | Enable/shutdown control | Pull low (<1.5V) to enter 10µA shutdown; rising threshold is 1.69V with 100mV hysteresis. |
| 6 GND | Power ground | Main return path for high-current switch node; connect to star ground point near rectifier and capacitors. |
| 7 VIN | Main input supply | Accepts 7.5–76V; requires local low-ESR bypass capacitor (e.g., 47µF aluminum + 0.1µF ceramic). |
| 8 LX | Switch node | Drives external Schottky diode (e.g., 50SQ100); connects to inductor and BST capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 76V DMOS switch | Eliminates external high-voltage MOSFET and associated gate-drive complexity in 48V/72V systems. |
| Internal frequency compensation | Enables stable operation with standard LC filter components-no external 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 output shorts by cycling on/off until fault clears. |
| Thermal shutdown with hysteresis | Shuts down at +160°C junction and resumes at +140°C, enabling safe self-recovery under overload. |
Applications
| Industrial Sensor Node Power | Railway Signaling Interface Supply |
|---|---|
|
Use Scenario: Powering 3.3V RS-485 transceivers and microcontrollers in outdoor-mounted vibration sensors exposed to 48V traction power rails. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator converting unregulated 48V rail to clean, isolated logic supply with UVLO and thermal protection. Use Value: Withstands 76V transients per EN 50155; 270µA quiescent current extends battery backup runtime during mains failure. |
Use Scenario: Generating 3.3V supply for FPGA configuration and LED drivers in trackside signal controllers powered from 72V DC distribution. IC Role / Device Role / Timing Role: High-reliability DC-DC stage providing regulated 3.3V with hiccup-mode fault containment during lightning-induced surges. Use Value: Internal 0.4Ω DMOS switch and 110°C/W PDIP thermal resistance ensure continuous operation at +70°C ambient without derating. |
| Automated Test Equipment (ATE) Auxiliary Rail | Energy Meter Data Acquisition Module |
|
Use Scenario: Providing isolated 3.3V supply for ADC reference and digital isolators in multi-channel ATE systems using 24V/48V backplane power. IC Role / Device Role / Timing Role: Fixed-output buck converter delivering low-noise 3.3V with <±3.5% regulation across 7.5–76V input range. Use Value: 125kHz switching frequency allows predictable EMI filtering; internal compensation avoids layout-sensitive external networks. |
Use Scenario: Powering metrology SoCs and optical isolation interfaces in DIN-rail energy meters connected to 24V building management systems. IC Role / Device Role / Timing Role: Primary 3.3V regulator handling wide-input variations (e.g., 12–48V) due to battery/solar hybrid sources. Use Value: Pulse-skipping mode ensures <300µA system standby current; ON/OFF pin enables synchronized deep-sleep wake-up. |
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 |
|---|---|---|---|
| LM5017MM/NOPB | 4.5–75V input, 3.3V fixed, 600mA, 650kHz, requires external compensation, no integrated bootstrap diode. | Better suited for space-constrained designs needing higher frequency; lacks pulse-skipping mode and higher quiescent current (1mA). | Select LM5017MM/NOPB when PCB area is critical and higher switching frequency is acceptable; avoid if ultra-low IQ or simplified design is required. |
| TPS54340DDAR | 3.5–42V input, adjustable output, 3.5A, 120kHz, requires external FET and compensation, no integrated high-side switch. | Higher current capability but incompatible with >42V inputs; demands full external power stage design effort. | Choose TPS54340DDAR only for 24V systems requiring >500mA; not viable for 48V/72V rails or drop-in replacement of MAX5033AUPA+. |
Compared with LM5017MM/NOPB and TPS54340DDAR, the MAX5033AUPA+ uniquely combines 76V input tolerance, integrated 0.4Ω DMOS switch, 270µA quiescent current, and fixed 3.3V output in a single 8-pin PDIP package-enabling robust, low-component-count designs for high-voltage industrial power rails.
Availability
MAX5033AUPA+ is available at Aetrix Electronics and suitable for industrial sensor nodes, railway signaling interfaces, automated test equipment auxiliary rails, and energy meter data acquisition modules requiring stable component supply across extended temperature and high-input-voltage conditions.
Supply support for MAX5033AUPA+ 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 industrial, automotive, and communications applications.
The MAX5033 product line delivers high-efficiency, high-input-voltage step-down converters targeting distributed power architectures in harsh environments-emphasizing integration, reliability, and ease of use over wide input ranges.
FAQ
What is the maximum input voltage rating for the MAX5033AUPA+?
The MAX5033AUPA+ supports an absolute maximum input voltage of +80V, with recommended continuous operation up to +76V. This enables direct interface with 48V and 72V industrial power buses, including transient-tolerant applications per EN 50155. Operation beyond 76V risks exceeding internal device stress limits and is not guaranteed.
Does the MAX5033AUPA+ require external compensation components?
No, the MAX5033AUPA+ includes internal frequency compensation optimized for stability with standard LC output filters. External compensation networks are unnecessary-reducing bill-of-materials count and eliminating layout sensitivity. This is confirmed in the datasheet's "Internal Frequency Compensation" feature and typical application circuits.
What is the thermal performance of the MAX5033AUPA+ in its PDIP package?
The MAX5033AUPA+ in 8-pin PDIP has a junction-to-ambient thermal resistance (θJA) of 110°C/W. At +70°C ambient, its maximum continuous power dissipation is 727mW, supporting full 500mA output at moderate input voltages (e.g., 12V–24V). Derating is required above +70°C at 9.1mW/°C.
How does the MAX5033AUPA+ achieve low quiescent current at light loads?
The MAX5033AUPA+ automatically enters pulse-skipping mode below ~65mA load, disabling switching cycles while maintaining regulation. This reduces no-load supply current to 270µA (typ), significantly lower than forced-PWM alternatives. Shutdown mode further lowers current to 10µA (typ) when ON/OFF is pulled low.
Can the MAX5033AUPA+ be used with an adjustable output voltage?
No-the MAX5033AUPA+ is the fixed 3.3V output variant (MAX5033A series). For adjustable output, the MAX5033DUPA+ must be used, which features a 1.25V–13.2V range via external resistor divider on the FB pin. The MAX5033AUPA+ has FB internally connected to the 3.3V output and cannot be reconfigured.
MAX5033AUPA+ 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):
- 3.3V
- 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
MAX5033AUPA+ FAQ
1.How can I place an order for MAX5033AUPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5033AUPA+ 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 MAX5033AUPA+ reliable?
The price and inventory of MAX5033AUPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5033AUPA+ is usually 5 days.
3.What payment methods are accepted for MAX5033AUPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5033AUPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5033AUPA+?
MAX5033AUPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5033AUPA+ 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 MAX5033AUPA+?
For technical support, including MAX5033AUPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5033AUPA+ requirements.
6.How does Aetrix verify that MAX5033AUPA+ is sourced from the original manufacturer or authorized distributors?
All MAX5033AUPA+ 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 MAX5033AUPA+ meets industry standards.
7.What is the process for return or replacement of MAX5033AUPA+?
All MAX5033AUPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5033AUPA+, 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 MAX5033AUPA+ part is unused and in its original packaging.
Return procedure for MAX5033AUPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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