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Analog Devices Inc./Maxim Integrated MAX5033DASA+T
- Part No.:
- MAX5033DASA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5033DASA+T.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,053
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Product details
Overview
MAX5033DASA+T from Maxim Integrated is a high-voltage, adjustable-output step-down DC-DC converter operating from 7.5V to 76V input, delivering up to 500mA output current with 90% efficiency at 12VIN/5VOUT, 270μA no-load quiescent current, and fixed 125kHz PWM switching frequency. It integrates a 0.4Ω high-side DMOS FET and operates across the automotive temperature range (−40°C to +125°C) in an 8-pin SO package for industrial power rails and distributed systems.
For engineers reviewing the MAX5033DASA+T datasheet, MAX5033DASA+T pinout, MAX5033DASA+T application, or MAX5033DASA+T equivalent, this page delivers verified electrical parameters, validated thermal and protection behavior, confirmed adjustable feedback architecture (1.221V reference), and real-world design constraints including BST capacitor requirements, PFM threshold (35–110mA), and ON/OFF control hysteresis (100mV).
Technical Context
The MAX5033DASA+T employs voltage-mode control with feed-forward compensation and internal Type-3 compensation network, eliminating external compensation components. Its integrated 0.4Ω high-side DMOS switch enables high efficiency across wide input ranges while supporting pulse-skipping mode below ~65mA load to maintain low IQ.
It features dual protection architecture: cycle-by-cycle current limiting (0.95–2.1A peak), hiccup-mode short-circuit response, and thermal shutdown triggered at +160°C (±20°C hysteresis). The FB pin regulates to 1.221V (typ), enabling precise output adjustment from 1.25V to 13.2V via external resistor divider, with ±150nA bias current ensuring minimal divider error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports wide industrial and automotive battery inputs without pre-regulation |
| Output Voltage | Adjustable 1.25V to 13.2V - set by external resistive divider referenced to 1.221V FB pin |
| Max Output Current | 500mA - limited by thermal dissipation in SO package (θJA = 170°C/W) |
| Switching Frequency | 105–137kHz (typ 125kHz) - fixed PWM frequency ensures predictable EMI profile and filter design |
| Quiescent Current | 270μA (typ) at no load - enables long battery life in always-on industrial sensors |
| Shutdown Current | 10μA (typ) - reduces system standby power when ON/OFF pin pulled low |
| Feedback Reference | 1.221V (min 1.192V, max 1.250V) - tight tolerance enables ±1.5% output regulation over temp and line |
Pinout & Package
MAX5033DASA+T is housed in an 8-pin SO (Small Outline) package compliant with JEDEC MS-012, with exposed pad not electrically connected. Thermal resistance θJA = 170°C/W enables operation up to +125°C ambient with appropriate PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BST | Bootstrap capacitor connection | Connects 0.1μF ceramic cap between BST and LX to generate gate drive for internal high-side DMOS |
| 2 - VD | Internal regulator output | Provides ~7.8V regulated supply for analog/digital circuitry; bypass to GND with 0.1μF ceramic |
| 3 - SGND | Signal ground reference | Internal analog ground node; must be tied directly to system GND plane |
| 4 - FB | Feedback input | Senses output voltage via external divider; regulates to 1.221V reference for adjustable output |
| 5 - ON/OFF | Enable/shutdown control | Rising threshold 1.69V (100mV hysteresis); drives low to enter 10μA shutdown state |
| 6 - GND | Power ground | Main return path for high-current switch node; connect to star ground point near rectifier and caps |
| 7 - VIN | Main input supply | Accepts 7.5–76V; requires low-ESR bulk capacitor placed adjacent to pin |
| 8 - LX | Switch node | Drives external Schottky diode (e.g., 50SQ100); connects to BST cap and inductor |
Key Features
| Feature | Design Value |
|---|---|
| Internal frequency compensation | Eliminates need for external compensation network - simplifies layout and improves stability margin |
| Pulse-skipping light-load mode | Reduces IQ to 270μA while maintaining >80% efficiency down to ~10mA load |
| Hiccup-mode short-circuit protection | Disables switching during sustained overload, then auto-retries - prevents thermal runaway |
| Integrated 0.4Ω high-side DMOS | Enables >90% efficiency at full load without external MOSFET or driver complexity |
| Automotive-grade temperature range | Guaranteed operation from −40°C to +125°C junction - qualified for under-hood and industrial environments |
Applications
| Industrial Sensor Power Supply | Distributed Control System Rail |
|---|---|
Use Scenario: Powering isolated 4–20mA transmitters and RTD interfaces in factory automation cabinets with 24V or 48V backplane. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator generating stable 5V or 3.3V local rail from wide-input industrial bus. Use Value: 76V max input withstands load-dump transients; 270μA IQ extends battery backup duration during AC loss. |
Use Scenario: Providing auxiliary 5V/500mA rail for PLC I/O modules and fieldbus gateways operating on 12–36V nominal supply. IC Role / Device Role / Timing Role: High-efficiency step-down converter with integrated switch and protection for compact embedded power stages. Use Value: Internal 0.4Ω DMOS and fixed 125kHz frequency enable small external LC filter (220μH + 33μF); thermal shutdown prevents failure during enclosure overheating. |
| Automotive Body Control Module | Telecom Remote Radio Unit |
Use Scenario: Generating 5V for microcontroller, CAN transceiver, and LED drivers in BCMs powered from 12V battery with cold-crank (6.5V) and load-dump (80V) events. IC Role / Device Role / Timing Role: Input-tolerant buck converter with programmable UVLO and hiccup-mode fault recovery. Use Value: Adjustable UVLO via ON/OFF pin allows setting startup threshold above 6.5V; 10μA shutdown current meets ISO 16750-2 quiescent leakage limits. |
Use Scenario: Converting 48V telecom plant voltage to 5V/500mA for remote PHY and timing ICs in outdoor macrocell radios. IC Role / Device Role / Timing Role: High-input-voltage DC-DC stage with robust thermal management for sealed, fanless enclosures. Use Value: +125°C rated SO package and +160°C thermal shutdown ensure reliability at 70°C ambient; 170°C/W θJA enables direct PCB heatsinking. |
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 2.5V reference; 500mA output; 2.8–75V input; no internal compensation - requires external RC network | Lacks integrated compensation and PFM mode - higher BOM count and less efficient at light loads | Choose LM5008AMM/NOPB only if design requires adjustable compensation or lower cost per unit with existing layout flexibility |
| TPS54340DDAR | 100% duty cycle capability; 3.5–42V input; 3.5A output; external MOSFET drive - no integrated high-side switch | Higher current but narrower input range; requires external FET and gate driver - larger solution size | Choose TPS54340DDAR when >500mA output or <7.5V minimum input is required, accepting added component count |
Compared with LM5008AMM/NOPB and TPS54340DDAR, MAX5033DASA+T offers superior integration (internal 0.4Ω FET, Type-3 compensation, PFM mode) and wider input range (7.5–76V), making it optimal for space-constrained, wide-input industrial and automotive buck designs where simplicity and light-load efficiency are critical.
Availability
MAX5033DASA+T is available at Aetrix Electronics and suitable for industrial sensor power supplies, distributed control system rails, and automotive body control modules requiring stable component supply with guaranteed automotive temperature qualification and lead(Pb)-free compliance.
Supply support for MAX5033DASA+T 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 series was developed specifically for high-input-voltage, medium-current DC-DC conversion in harsh environments - emphasizing ruggedness, integrated protection, and minimal external component count for reliable power delivery in space- and thermal-constrained systems.
FAQ
What is the feedback reference voltage for MAX5033DASA+T?
The MAX5033DASA+T uses a precision 1.221V (typ) feedback reference voltage at the FB pin, with min/max values of 1.192V and 1.250V across temperature and process. This reference enables accurate output voltage setting from 1.25V to 13.2V using an external resistor divider, and its low ±150nA bias current minimizes divider error - a key specification confirmed in the Electrical Characteristics table for MAX5033_A_ _.
Does MAX5033DASA+T require external compensation components?
No, MAX5033DASA+T includes internal Type-3 frequency compensation, eliminating the need for external capacitors or resistors in the feedback loop. This is explicitly stated in both the General Description and Applications Information sections, and confirmed by the "Internal Frequency Compensation" feature bullet - simplifying design and improving stability margin without sacrificing bandwidth.
What is the maximum junction temperature and thermal shutdown behavior of MAX5033DASA+T?
MAX5033DASA+T triggers thermal shutdown at +160°C junction temperature (TSH) with +20°C hysteresis, re-enabling operation once die temperature falls to +140°C. This behavior is documented in the Absolute Maximum Ratings and Electrical Characteristics tables, and results in pulsed output under continuous overload - protecting the device while maintaining system awareness of thermal stress.
Can MAX5033DASA+T operate with input voltage below 7.5V?
No - the absolute minimum input voltage for functional operation of MAX5033DASA+T is 7.5V, as specified in the Electrical Characteristics table under "Input Voltage Range". Below this, undervoltage lockout prevents switching; the internal UVLO threshold is 5.2V (typ), but the device requires ≥7.5V to sustain regulation and deliver rated output current.
What external components are mandatory for MAX5033DASA+T operation?
Mandatory external components for MAX5033DASA+T include: (1) 0.1μF ceramic BST capacitor between BST and LX pins, (2) 0.1μF ceramic bypass capacitor from VD to GND, (3) input bulk capacitor (e.g., 47μF low-ESR aluminum) at VIN, (4) output filter capacitor (e.g., 33μF tantalum), (5) Schottky freewheeling diode (e.g., 50SQ100), and (6) power inductor (e.g., 220μH). These are all specified in the Typical Application Circuit and Applications Information sections.
MAX5033DASA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7.5V
- Voltage - Input (Max):
- 76V
- Voltage - Output (Min/Fixed):
- 1.221V
- Voltage - Output (Max):
- 13.2V
- 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
MAX5033DASA+T FAQ
1.How can I place an order for MAX5033DASA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5033DASA+T 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 MAX5033DASA+T reliable?
The price and inventory of MAX5033DASA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5033DASA+T is usually 5 days.
3.What payment methods are accepted for MAX5033DASA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5033DASA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5033DASA+T?
MAX5033DASA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5033DASA+T 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 MAX5033DASA+T?
For technical support, including MAX5033DASA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5033DASA+T requirements.
6.How does Aetrix verify that MAX5033DASA+T is sourced from the original manufacturer or authorized distributors?
All MAX5033DASA+T 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 MAX5033DASA+T meets industry standards.
7.What is the process for return or replacement of MAX5033DASA+T?
All MAX5033DASA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5033DASA+T, 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 MAX5033DASA+T part is unused and in its original packaging.
Return procedure for MAX5033DASA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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