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Analog Devices Inc./Maxim Integrated MAX5033BASA+
- Part No.:
- MAX5033BASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5033BASA+.pdf
- Description:
- IC REG BUCK 5V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:359
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Product details
Overview
The MAX5033BASA+ 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 load, and automotive-grade (-40°C to +125°C) SO-8 packaging. It delivers up to 90% efficiency at 500mA and supports industrial power rails in distributed systems.
For engineers reviewing the MAX5033BASA+ datasheet, MAX5033BASA+ pinout, MAX5033BASA+ application, or MAX5033BASA+ equivalent, key selection criteria include its wide-input voltage range, integrated gate drive (BST), thermal shutdown at +160°C, 270μA no-load quiescent current, and compatibility with standard Schottky rectifiers like 50SQ100.
Technical Context
The MAX5033BASA+ uses voltage-mode control with feed-forward compensation and an internal high-side n-channel DMOS switch. Its 125kHz oscillator operates in fixed-frequency PWM mode under heavy load and transitions automatically to pulse-skipping mode below ~65mA to maintain high light-load efficiency.
It integrates undervoltage lockout (UVLO = 5.2V typ), cycle-by-cycle current limit (ILIM = 0.95–2.1A), hiccup-mode short-circuit protection, and thermal shutdown with 20°C hysteresis. The FB pin regulates output via internal 1.221V reference, and ON/OFF control enables shutdown with 1.69V rising threshold and 100mV hysteresis.
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 for logic supply or analog subsystems. |
| Max Output Current | 500mA - limited by package thermal dissipation (471mW @ TA=+70°C, SO-8). |
| Switching Frequency | 125kHz (105–137kHz over temp) - enables use of compact 220µH inductors and reduces EMI compared to higher frequencies. |
| Quiescent Current | 270µA (typ) at no load - enables long standby operation in always-on systems. |
| Shutdown Current | 10µA (typ) - ensures minimal system leakage when disabled. |
| Internal High-Side RDS(ON) | 0.4Ω (typ) - reduces conduction loss and eliminates need for external MOSFET driver. |
Pinout & Package
MAX5033BASA+ is housed in an 8-pin SO (Small Outline) package compliant with JEDEC MS-012, with θJA = 170°C/W and rated for -40°C to +125°C ambient operation.
| 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 efficient n-channel DMOS operation. |
| 2 - VD | Internal regulator output | Provides ~7.8V bias for internal circuitry; requires 0.1µF ceramic bypass to GND. |
| 3 - SGND | Signal ground reference | Must be connected directly to system ground plane; separates analog sensing from power return paths. |
| 4 - FB | Feedback input | Senses output voltage; internally referenced to 1.221V; for MAX5033BASA+, connected directly to VOUT. |
| 5 - ON/OFF | Enable/shutdown control | Logic-level input: <1.5V = shutdown (10µA IQ), >1.69V = active; includes 100mV hysteresis. |
| 6 - GND | Power ground | Main return path for high-current switching loop; must tie to SGND at single-point star ground. |
| 7 - VIN | Main input supply | Accepts 7.5–76V; requires low-ESR input capacitor (e.g., 47µF aluminum + 0.1µF ceramic) near pin. |
| 8 - LX | Switch node | Connects to inductor and Schottky cathode; carries high di/dt; critical for EMI and layout integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-voltage DMOS switch | 0.4Ω RDS(ON) enables self-contained buck conversion without external MOSFET or driver. |
| Internal frequency compensation | Eliminates need for external compensation network; simplifies design and improves stability across line/load/temp. |
| Pulse-skipping light-load mode | Maintains >80% efficiency down to ~1mA load, reducing idle power in battery-backed or energy-sensitive systems. |
| Hiccup-mode short-circuit protection | Shuts down on overload, cools, then retries - prevents thermal runaway during sustained fault conditions. |
| Automotive temperature grade | -40°C to +125°C operation ensures reliability in engine bay, industrial controls, and harsh-environment power supplies. |
Applications
| Industrial Sensor Node Power | Railway Signaling Supply |
|---|---|
Use Scenario: Powering 4–20mA transmitters and isolated ADCs in remote field instruments exposed to 24–72V DC rail fluctuations. IC Role / Device Role / Timing Role: Primary non-isolated step-down regulator converting unregulated 48V train or factory bus to stable 5V for microcontroller and signal conditioning. Use Value: 76V max input withstands load-dump transients; 270µA quiescent current extends battery life in wireless sensor variants. |
Use Scenario: Providing clean 5V bias to LED indicators, optocouplers, and safety-critical logic in EN 50121-compliant signaling cabinets. IC Role / Device Role / Timing Role: Point-of-load regulator fed from 72V auxiliary supply; delivers ripple-free 5V with fast transient response to digital interface loads. Use Value: Thermal shutdown at +160°C prevents failure during prolonged overtemperature events; SO-8 package supports conformal coating for humidity resistance. |
| Automotive Body Control Module | Distributed Telecom Power |
Use Scenario: Generating 5V for microcontrollers and CAN transceivers in door modules, seat controllers, and lighting ECUs. IC Role / Device Role / Timing Role: Secondary buck converter downstream of main 12V/24V battery rail; handles cold-crank (6.5V) to load-dump (80V) extremes. Use Value: Internal UVLO (5.2V) plus programmable ON/OFF threshold allows precise start-up sequencing; 125kHz switching avoids AM band interference. |
Use Scenario: Local 5V generation for FPGA I/O banks, PHY interfaces, and management controllers in modular telecom chassis with 48V backplane. IC Role / Device Role / Timing Role: Compact, thermally robust POL regulator placed near load; replaces discrete buck solutions requiring 6+ components. Use Value: 500mA output supports multi-rail SoC domains; BST-driven high-side switch eliminates bootstrap diode and reduces BOM count. |
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 sensitivity; lacks pulse-skipping mode. | Prefer MAX5033BASA+ for lower EMI, simpler layout, and better light-load efficiency in space-constrained industrial designs. |
| TPS54340DDAR | Adjustable output (1.22V–60V), 3.5A, 3.5–42V input, 300kHz, integrated compensation, but lower max input voltage. | Not suitable for 76V inputs; designed for mid-range industrial rails only. | Choose MAX5033BASA+ when input exceeds 42V or fixed 5V output with minimal external components is required. |
Compared with LM5008AMM/NOPB and TPS54340DDAR, the MAX5033BASA+ uniquely combines 76V input tolerance, fixed 5V output, internal compensation, and automotive temperature rating in an SO-8 package - making it optimal for high-reliability, wide-input industrial and transportation power systems where simplicity and ruggedness are prioritized over ultra-high current or adjustable output.
Availability
MAX5033BASA+ is available at Aetrix Electronics and suitable for industrial sensor nodes, railway signaling systems, automotive body control modules, and distributed telecom power supplies requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX5033BASA+ 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 industrial, automotive, and communications markets.
The MAX5033BASA+ belongs to Maxim's MAXPower™ family of high-voltage DC-DC converters, engineered for rugged, low-component-count power conversion in harsh environments where wide input range and thermal resilience are critical.
FAQ
What is the maximum input voltage supported by the MAX5033BASA+?
The MAX5033BASA+ supports an absolute maximum input voltage of +80V, with continuous operation specified from 7.5V to 76V. This makes it suitable for applications involving 48V and 72V industrial or automotive battery systems, including load-dump transients up to 80V. Operation beyond 76V is not recommended for sustained use per datasheet limits.
Does the MAX5033BASA+ require external compensation components?
No, the MAX5033BASA+ features fully internal frequency compensation optimized for stability with standard LC output filters. Unlike many buck controllers, it does not require external Type II or Type III compensation networks - significantly reducing design complexity and board area while maintaining robust phase margin across temperature and load.
How does the MAX5033BASA+ handle short-circuit conditions?
The MAX5033BASA+ employs hiccup-mode output short-circuit protection: upon detecting overcurrent, it shuts down the switch, waits for thermal recovery, then attempts restart. This prevents destructive power dissipation during sustained faults. The thermal shutdown threshold is +160°C with +20°C hysteresis, ensuring safe operation even under worst-case PCB layouts.
Can the MAX5033BASA+ be used with a 24V input to deliver 500mA at 5V?
Yes - the MAX5033BASA+ delivers up to 94% efficiency at 24V input and 500mA output (per MAX5033C data, scaled for 5V version). At 24V/5V/500mA, typical efficiency is ≥90%, well within thermal limits of the SO-8 package when using proper PCB copper pour and layout practices per the datasheet guidelines.
What Schottky diode is recommended for use with the MAX5033BASA+?
The MAX5033BASA+ datasheet specifies 50SQ100 (IR) as the preferred Schottky rectifier for 7.5–76V input ranges. It offers 100V reverse voltage rating, low forward drop (<0.45V at full load), and sufficient surge current capability. Alternatives include MBRM5100 (Diodes Inc.) or B360A (Diodes Inc.), provided VR ≥ 76V and IF(AV) ≥ 500mA.
MAX5033BASA+ 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:
- 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+ FAQ
1.How can I place an order for MAX5033BASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5033BASA+ 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+ reliable?
The price and inventory of MAX5033BASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5033BASA+ is usually 5 days.
3.What payment methods are accepted for MAX5033BASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5033BASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5033BASA+?
MAX5033BASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5033BASA+ 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+?
For technical support, including MAX5033BASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5033BASA+ requirements.
6.How does Aetrix verify that MAX5033BASA+ is sourced from the original manufacturer or authorized distributors?
All MAX5033BASA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX5033BASA+?
All MAX5033BASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5033BASA+, 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+ part is unused and in its original packaging.
Return procedure for MAX5033BASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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