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Analog Devices Inc./Maxim Integrated MAX5033AASA+
- Part No.:
- MAX5033AASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5033AASA+.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:368
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Product details
Overview
The MAX5033AASA+ from Maxim Integrated is a high-efficiency, 76V-input, fixed-output 3.3V step-down DC-DC converter with internal 0.4Ω high-side DMOS FET, 125kHz fixed-frequency PWM operation, and pulse-skipping mode for light-load efficiency. It delivers up to 500mA output current, features 270μA no-load quiescent current, and operates across the automotive temperature range (–40°C to +125°C) in an 8-pin SO package - ideal for distributed power rails in industrial control systems.
For engineers reviewing the MAX5033AASA+ datasheet, MAX5033AASA+ pinout, MAX5033AASA+ application, or MAX5033AASA+ equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications under –40°C to +125°C conditions, and real-world design implications for high-voltage buck conversion with integrated gate drive and protection.
Technical Context
The MAX5033AASA+ implements voltage-mode PWM control with feed-forward compensation and internal frequency compensation, eliminating external loop components. Its integrated high-side DMOS switch and bootstrap gate drive (BST pin) enable efficient operation up to 76V input while maintaining stable regulation at 3.3V ±3.5% over load (20–500mA) and temperature (–40°C to +125°C).
It combines undervoltage lockout (5.2V typ), cycle-by-cycle current limiting (1.5A typ peak), hiccup-mode short-circuit protection, and thermal shutdown (160°C trip, 140°C recovery). Shutdown is controlled via ON/OFF pin with 1.69V rising threshold and 100mV hysteresis, drawing only 10μA in shutdown mode.
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 | 3.3V ±3.5% (3.185V–3.415V) - tightly regulated fixed output suitable for powering microcontrollers and logic interfaces. |
| Max Output Current | 500mA - limited by package thermal dissipation (471mW at TA = +70°C, SO package). |
| Switching Frequency | 125kHz (105–137kHz over temp) - enables use of compact magnetics while balancing EMI and efficiency. |
| Quiescent Current | 270μA (typ) at no load - enables long standby life in always-on industrial sensors and telematics units. |
| Shutdown Current | 10μA (typ) - ensures minimal system-level leakage during deep sleep or fault isolation. |
| Internal Switch RDS(ON) | 0.4Ω (typ) - reduces conduction loss and eliminates need for external high-voltage MOSFET. |
Pinout & Package
MAX5033AASA+ is housed in an 8-pin SO (Small Outline) package compliant with JEDEC MS-012, with θJA = 170°C/W and moisture sensitivity level (MSL) 1. The exposed pad is not electrically connected; thermal relief via PCB copper is recommended.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor connection | Drives high-side DMOS gate; requires 0.1μF ceramic cap between BST and LX for proper gate voltage boosting. |
| VD | Internal regulator output | Provides ~7.8V bias for internal circuitry; must be bypassed to GND with 0.1μF ceramic capacitor. |
| SGND | Signal ground reference | Internal analog ground node; must be tied directly to system GND to maintain feedback accuracy. |
| FB | Feedback input | Connected directly to VOUT for fixed 3.3V operation; senses regulated output voltage at 1.221V internal reference. |
| ON/OFF | Enable/shutdown control | Logic-level input: <1.5V = shutdown (10μA IQ), >1.85V = active; includes 100mV hysteresis for noise immunity. |
| GND | Power ground | Main return path for high-current switch node; must be star-connected with input/output capacitors and rectifier anode. |
| VIN | Main input supply | Accepts 7.5–76V; requires low-ESR input capacitor placed adjacent to pin to minimize switching ripple and EMI. |
| LX | Switch node | Connects to inductor and Schottky rectifier cathode; carries high di/dt; layout critical for efficiency and stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-voltage DMOS switch | 0.4Ω RDS(ON) enables single-chip 76V-to-3.3V conversion without external FET or driver. |
| Internal frequency compensation | Eliminates external compensation network - simplifies design and improves production consistency. |
| Pulse-skipping light-load mode | Maintains >80% efficiency down to 1mA load, critical for battery-backed or energy-harvesting applications. |
| Automotive-grade temperature range | –40°C to +125°C operation with guaranteed specs - qualified for under-hood and industrial control environments. |
| Hiccup-mode short-circuit protection | Auto-retries after fault clearance - prevents thermal runaway during sustained output shorts. |
Applications
| Industrial PLC I/O Power | Railway Signaling Supply |
|---|---|
Use Scenario: Powering isolated digital I/O modules in programmable logic controllers operating from 24V or 48V DC rails. IC Role / Device Role / Timing Role: Primary 3.3V local point-of-load regulator delivering 500mA to FPGA configuration circuitry and level-shifted communication interfaces. Use Value: Eliminates need for external high-voltage MOSFET and gate driver; 270μA quiescent current extends backup battery life during brownout events. | Use Scenario: Generating stable 3.3V supply for microcontroller-based track occupancy detectors deployed in outdoor railway cabinets. IC Role / Device Role / Timing Role: High-reliability buck converter handling wide input transients (up to 76V surge) and operating continuously at –40°C to +125°C ambient. Use Value: Internal thermal shutdown (160°C) and hiccup-mode protection prevent field failures due to enclosure overheating or rectifier faults. |
| Automotive Body Control Module | Telecom Remote Radio Unit |
Use Scenario: Providing 3.3V rail for CAN transceiver and sensor interface ICs in body control units powered from 12V battery with load-dump transients. IC Role / Device Role / Timing Role: Input-filtered, fixed-output DC-DC stage accepting up to 76V input during ISO 7637-2 pulse 5a transients. Use Value: Undervoltage lockout (5.2V) prevents erratic startup during cranking; 125kHz switching allows compact 220μH inductor per typical application circuit. | Use Scenario: Powering low-power RF front-end ASICs in remote radio heads mounted on cell towers with 48V DC plant supply. IC Role / Device Role / Timing Role: Efficient intermediate bus converter stepping 48V down to 3.3V for digital baseband processing and memory subsystems. Use Value: 90% efficiency at 500mA (VIN=48V) reduces heat buildup in sealed enclosures; SO package supports automated optical inspection (AOI) in high-volume assembly. |
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 | 4.5–75V input, 3.3V fixed, 500mA, 1MHz switching, no internal compensation - requires external RC network. | Higher frequency enables smaller inductors but increases EMI filtering complexity; lower thermal rating (θJA = 210°C/W). | Prefer LM5008AMM/NOPB when board space is constrained and EMI filtering is already implemented; avoid if layout lacks compensation expertise. |
| TPS54340DDAR | 3.5–42V input, adjustable output, 3.5A, 3.5MHz, integrated compensation - wider current capability but lower max input voltage. | Not suitable for 48V+ or load-dump scenarios; requires external resistor divider for 3.3V setting; higher cost per mA. | Choose TPS54340DDAR only for designs requiring >500mA or where input never exceeds 42V; MAX5033AASA+ remains superior for 76V-rated systems. |
Compared with LM5008AMM/NOPB and TPS54340DDAR, the MAX5033AASA+ uniquely combines 76V absolute maximum input, automotive temperature qualification, internal compensation, and fixed 3.3V output in a cost-optimized SO package - making it the most direct solution for high-input-voltage industrial and transportation power rails.
Availability
MAX5033AASA+ is available at Aetrix Electronics and suitable for industrial automation, railway signaling, and automotive body electronics requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for MAX5033AASA+ 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 product line delivers high-voltage, high-efficiency step-down converters optimized for rugged environments - specifically engineered to replace discrete high-voltage buck solutions with integrated DMOS switches and protection features.
FAQ
What is the guaranteed output voltage tolerance for MAX5033AASA+ over temperature and load?
The MAX5033AASA+ guarantees 3.3V output within ±3.5% (3.185V to 3.415V) across full load (20mA to 500mA) and full operating temperature (–40°C to +125°C), as specified in the Electrical Characteristics table for MAX5033_A_ _ grade. This tolerance includes initial accuracy, line regulation, load regulation, and thermal drift - all tested and characterized for the A-grade automotive version.
Can MAX5033AASA+ operate safely with 76V input continuously?
Yes, MAX5033AASA+ is rated for continuous operation at 76V input, as confirmed by Absolute Maximum Ratings (VIN ≤ +80V) and Electrical Characteristics (VIN = 7.5V to 76V). Thermal performance must be verified: at 76V/500mA, power dissipation exceeds 3W - requiring adequate PCB copper area (≥4 cm² 2oz copper) and airflow to maintain junction temperature below 150°C.
Does MAX5033AASA+ require an external Schottky diode, and what are the key selection criteria?
Yes, MAX5033AASA+ requires an external Schottky rectifier (e.g., 50SQ100) connected from LX to GND. Key criteria include: reverse voltage rating >76V, forward voltage <0.45V at max load, and average current rating ≥500mA. Diode selection must also consider thermal derating at elevated ambient temperatures - refer to Table 1 in the MAX5033AASA+ datasheet for validated part numbers per input voltage range.
How does the ON/OFF pin function in MAX5033AASA+, and what happens during shutdown?
The ON/OFF pin on MAX5033AASA+ controls device enable: pulling below 1.5V (typ) forces shutdown, reducing VIN supply current to 10μA (typ) and turning off the internal high-side DMOS switch. During shutdown, all internal circuitry (oscillator, error amplifier, gate driver) is disabled. Startup occurs when ON/OFF rises above 1.69V (typ) with 100mV hysteresis - preventing chatter near the threshold.
Is the MAX5033AASA+ pin-compatible with other MAX5033 variants like MAX5033BASA+ or MAX5033CASA+?
Yes, MAX5033AASA+, MAX5033BASA+, and MAX5033CASA+ share identical 8-pin SO packaging, pinout, and thermal characteristics. They differ only in factory-trimmed output voltage (3.3V, 5V, or 12V) and corresponding FB network configuration - allowing drop-in replacement in layouts designed for the same output voltage family, provided input voltage and load requirements remain compatible.
MAX5033AASA+ 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):
- 3.3V
- 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
MAX5033AASA+ FAQ
1.How can I place an order for MAX5033AASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5033AASA+ 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 MAX5033AASA+ reliable?
The price and inventory of MAX5033AASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5033AASA+ is usually 5 days.
3.What payment methods are accepted for MAX5033AASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5033AASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5033AASA+?
MAX5033AASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5033AASA+ 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 MAX5033AASA+?
For technical support, including MAX5033AASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5033AASA+ requirements.
6.How does Aetrix verify that MAX5033AASA+ is sourced from the original manufacturer or authorized distributors?
All MAX5033AASA+ 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 MAX5033AASA+ meets industry standards.
7.What is the process for return or replacement of MAX5033AASA+?
All MAX5033AASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5033AASA+, 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 MAX5033AASA+ part is unused and in its original packaging.
Return procedure for MAX5033AASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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