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Analog Devices Inc./Maxim Integrated MAX5033DASA+
- Part No.:
- MAX5033DASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5033DASA+.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,693
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Product details
Overview
The MAX5033DASA+ from Maxim Integrated is an adjustable-output, high-voltage (7.5V–76V), 500mA step-down DC-DC converter with internal 0.4Ω high-side DMOS FET, fixed 125kHz PWM operation, and pulse-skipping mode for light-load efficiency. It delivers stable 1.25V–13.2V output in automotive-grade (-40°C to +125°C) 8-pin SO package and is used in distributed power systems requiring wide-input industrial supplies.
For engineers reviewing the MAX5033DASA+ datasheet, MAX5033DASA+ pinout, MAX5033DASA+ application, or MAX5033DASA+ equivalent, key selection criteria include its adjustable feedback voltage (1.221V typ), 270μA no-load quiescent current, thermal shutdown at +160°C, and compatibility with external Schottky rectifiers up to 76V input.
Technical Context
The MAX5033DASA+ employs voltage-mode control with feed-forward compensation and integrates a high-voltage DMOS switch, internal regulator (VD = 7.8V typ), and type-3 compensation network - eliminating external compensation components. Its ON/OFF pin provides 1.69V rising threshold with 100mV hysteresis for programmable UVLO or shutdown.
It operates in fixed-frequency PWM above ~65mA load and automatically transitions to pulse-skipping mode below that threshold, maintaining >85% efficiency at 10mA load while holding IQ ≤ 440μA across -40°C to +125°C. The BST pin drives the high-side gate via a 0.1μF bootstrap capacitor referenced to LX.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports wide industrial and automotive battery inputs including 24V, 36V, 48V, and 72V nominal systems. |
| Output Voltage Range | 1.25V to 13.2V (adjustable via FB divider) - enables flexible rail generation without discrete LDO post-regulation. |
| Max Output Current | 500mA - limited by thermal dissipation in SO package (θJA = 170°C/W); peak switch current limit is 1.5A (typ). |
| Quiescent Current | 270μA (typ) at no load - enables always-on subsystems in low-power industrial IoT nodes. |
| Switching Frequency | 125kHz (109–137kHz over temp) - balances EMI, inductor size, and MOSFET switching loss for cost-sensitive designs. |
| Feedback Voltage | 1.221V (1.192–1.250V) - sets precise output tolerance when using standard 1% resistors in FB divider network. |
| Shutdown Current | 10μA (typ) - reduces system standby power to sub-100μW levels with ON/OFF pin pulled low. |
Pinout & Package
MAX5033DASA+ uses an 8-pin SO (Small Outline) package rated for -40°C to +125°C operation. Pin 1 is BST; pin 6 is GND; pin 8 is LX. Thermal pad is not present - PCB copper pour on SGND/GND pins is recommended for heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 1) | Bootstrap capacitor connection | Drives high-side DMOS gate; requires 0.1μF ceramic cap between BST and LX - placement critical for gate drive integrity. |
| VD (Pin 2) | Internal regulator output | Supplies bias for internal circuitry and charges BST cap; bypassed with 0.1μF ceramic to SGND. |
| SGND (Pin 3) | Signal ground reference | Must be connected directly to system GND - separates analog sensing path from power return currents. |
| FB (Pin 4) | Feedback input | Senses output via resistor divider; regulates VOUT to 1.221V at FB - determines output voltage accuracy and transient response. |
| ON/OFF (Pin 5) | Enable/shutdown control | Logic-level input: <1.5V = shutdown (10μA IQ), >1.69V = active; 100mV hysteresis prevents chatter near threshold. |
| GND (Pin 6) | Power ground | Primary return path for LX switch current and output capacitor discharge - star-ground connection required. |
| VIN (Pin 7) | Main input supply | Accepts 7.5–76V; requires local low-ESR bulk capacitor (e.g., 47μF aluminum + 0.1μF ceramic) placed adjacent to pin. |
| LX (Pin 8) | Switch node | Connects to inductor and Schottky cathode; carries high di/dt - short, wide traces and tight layout minimize ringing and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Internal frequency compensation | Eliminates need for external compensation network - simplifies design and improves production yield across temperature. |
| Integrated 0.4Ω high-side DMOS FET | Reduces BOM count and PCB area vs. controller + external MOSFET; enables compact 500mA buck solutions. |
| Pulse-skipping light-load mode | Maintains >85% efficiency at 10mA load while holding IQ ≤ 440μA - extends battery life in intermittent-duty applications. |
| Hiccup-mode short-circuit protection | Shuts down during sustained overload, cools, then retries - prevents thermal runaway and enables self-recovery without reset. |
| Automotive-grade temperature range | -40°C to +125°C operation with guaranteed specs - qualified for under-hood and industrial control cabinet deployment. |
Applications
| Industrial Sensor Node Power | Rail Generator for PLC I/O Modules |
|---|---|
|
Use Scenario: Powering 4–20mA transmitters, RTD interfaces, and isolated ADCs in field-mounted sensors operating from 24V or 36V loop supplies. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering 3.3V or 5V to microcontroller and analog front-end. Use Value: Wide 7.5–76V input accommodates brownout and surge conditions; 270μA IQ enables energy harvesting-compatible sleep modes. |
Use Scenario: Generating localized 5V/3.3V rails inside programmable logic controller (PLC) backplanes fed from 24V or 48V system bus. IC Role / Device Role / Timing Role: Point-of-load (POL) DC-DC converter supplying FPGA I/O banks and communication peripherals. Use Value: Adjustable output allows precise rail matching; hiccup-mode protection prevents cascade failure during field-wiring faults. |
| Distributed Power in Transportation Systems | High-Voltage Battery Monitoring Supply |
|
Use Scenario: Providing regulated 5V for CAN transceivers, display controllers, and diagnostics modules in rail, marine, and off-highway vehicles. IC Role / Device Role / Timing Role: Input-stage buck converter accepting unregulated 24V–72V battery inputs before downstream LDOs or isolated DC-DC stages. Use Value: Automotive temperature rating and 76V absolute max VIN withstand capability support direct connection to traction battery auxiliary taps. |
Use Scenario: Powering fuel-cell stack monitors, battery management ICs, and cell-voltage measurement circuits in 48V–72V EV/HEV auxiliary systems. IC Role / Device Role / Timing Role: High-input buck regulator generating 3.3V for precision ADCs and microcontrollers sampling high-side cell voltages. Use Value: 1.221V FB reference enables <±1% output accuracy over temp; thermal shutdown protects against enclosure overheating 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 500kHz switching frequency; 75V max VIN; 300mA output; requires external compensation. | Better suited for space-constrained designs needing higher frequency and smaller magnetics; lower output current limits use cases. | Select LM5008AMM/NOPB when board area is critical and load current ≤300mA; verify external compensation stability across full temp range. |
| TPS54360DGQR | 60V max VIN; 3.5A output; integrated soft-start; adjustable frequency (100kHz–2.5MHz); no internal VD regulator. | Higher current capability and wider frequency tuning enable multi-rail or dynamic load applications; lacks integrated bias rail for bootstrap. | Choose TPS54360DGQR for >500mA loads or when programmable frequency/soft-start is required; add external 7.8V bias source if BST drive is needed. |
Compared with LM5008AMM/NOPB and TPS54360DGQR, the MAX5033DASA+ offers superior light-load efficiency via pulse-skipping, built-in VD bias for simplified bootstrap, and guaranteed -40°C to +125°C operation - making it optimal for thermally demanding, low-duty-cycle industrial power rails.
Availability
MAX5033DASA+ is available at Aetrix Electronics and suitable for industrial sensor nodes, PLC I/O modules, transportation electronics, and high-voltage battery monitoring systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX5033DASA+ 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 series is part of Maxim's high-voltage DC-DC converter portfolio, engineered specifically for robust, wide-input industrial power conversion where reliability across extreme temperatures and input transients is mandatory.
FAQ
What is the minimum input voltage required for MAX5033DASA+ to start regulation?
The MAX5033DASA+ features an internal undervoltage lockout (UVLO) that enables operation when VIN rises above 5.2V (typ). If using the ON/OFF pin for external UVLO programming, the minimum threshold is set by the resistor divider - but the internal 5.2V UVLO ensures basic functionality even without external components. Startup is guaranteed across -40°C to +125°C.
Can MAX5033DASA+ operate with an input voltage of 76V continuously?
Yes, MAX5033DASA+ is rated for continuous operation up to 76V input. Its absolute maximum VIN rating is +80V, and electrical characteristics (including efficiency, thermal shutdown, and switch RDS(ON)) are specified up to 76V. At 76V input and 500mA load, ensure adequate PCB copper area and ambient cooling to maintain junction temperature below +150°C.
What is the purpose of the VD pin on MAX5033DASA+, and how should it be decoupled?
The VD pin on MAX5033DASA+ outputs a regulated ~7.8V supply used internally to bias control circuitry and charge the BST capacitor. It must be bypassed to SGND with a 0.1μF ceramic capacitor placed within 2mm of the pin. Failure to properly decouple VD risks unstable gate drive and erratic switching behavior, especially during startup and load transients.
How does the MAX5033DASA+ handle short-circuit conditions on the output?
MAX5033DASA+ implements hiccup-mode short-circuit protection: upon detecting overcurrent, it shuts down the switch, waits for thermal recovery, then attempts restart. This cycle repeats until the fault clears. Unlike latch-off protection, hiccup mode prevents thermal damage while enabling automatic recovery - critical for unattended industrial equipment powered from remote sources.
Is the MAX5033DASA+ pin-compatible with other MAX5033 variants like MAX5033BASA+?
Yes, all MAX5033 variants - including MAX5033DASA+, MAX5033BASA+, and MAX5033CASA+ - share identical 8-pin SO packaging and pinout. The only functional differences are output configuration (fixed 3.3V/5V/12V vs. adjustable) and minor electrical tolerances; no PCB redesign is needed when migrating between versions for voltage flexibility or qualification requirements.
MAX5033DASA+ 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:
- 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+ FAQ
1.How can I place an order for MAX5033DASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5033DASA+ 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+ reliable?
The price and inventory of MAX5033DASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5033DASA+ is usually 5 days.
3.What payment methods are accepted for MAX5033DASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5033DASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5033DASA+?
MAX5033DASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5033DASA+ 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+?
For technical support, including MAX5033DASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5033DASA+ requirements.
6.How does Aetrix verify that MAX5033DASA+ is sourced from the original manufacturer or authorized distributors?
All MAX5033DASA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX5033DASA+?
All MAX5033DASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5033DASA+, 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+ part is unused and in its original packaging.
Return procedure for MAX5033DASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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