My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX5033CUSA+T
- Part No.:
- MAX5033CUSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5033CUSA+T.pdf
- Description:
- IC REG BUCK 12V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,999
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX5033CUSA+T from Maxim Integrated is a high-voltage, fixed-output 12V step-down DC-DC converter with internal 0.4Ω high-side DMOS FET, delivering up to 500mA output current from a 15V–76V input range while maintaining 94% efficiency at 24VIN/500mAOUT. It operates at a fixed 125kHz switching frequency, features pulse-skipping mode for light-load efficiency, and integrates undervoltage lockout, thermal shutdown, and hiccup-mode short-circuit protection-ideal for industrial power rails in harsh environments.
For engineers reviewing the MAX5033CUSA+T datasheet, MAX5033CUSA+T pinout, MAX5033CUSA+T application, or MAX5033CUSA+T equivalent, this page delivers verified technical context, package-specific design meaning, real-world application constraints (e.g., 15V minimum input, SO-8 thermal derating), and validated alternative options for 12V distributed power designs.
Technical Context
The MAX5033CUSA+T uses voltage-mode PWM control with feed-forward compensation and internal Type-3 compensation network, eliminating external compensation components. Its integrated high-side DMOS switch enables single-inductor buck topology with bootstrap gate drive (BST–LX), requiring only a 0.1μF ceramic capacitor for gate boosting.
It implements automatic transition between PWM and pulse-skipping modes based on load current-maintaining >85% efficiency down to 10mA load-while enforcing cycle-by-cycle current limiting (1.5A typical peak limit) and thermal shutdown at +160°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 15V to 76V - supports wide industrial input rails; UVLO activates below 5.2V (internal) or programmable via ON/OFF divider. |
| Output Voltage | Fixed 12V ±3% (11.64V–12.42V) - tightly regulated across temperature and line/load; no external feedback resistors required. |
| Max Output Current | 500mA - limited by package thermal dissipation (471mW @ +70°C in SO-8); actual current depends on ambient, layout, and input voltage. |
| Switching Frequency | 125kHz (109–137kHz) - fixed oscillator enables predictable EMI filtering; supports standard 220μH inductors per typical application. |
| Quiescent Current | 270μA (typ) at no load - enables low-power standby operation; drops to 10μA in shutdown mode. |
| Internal Switch RDS(ON) | 0.4Ω (typ) - reduces conduction loss and eliminates need for external high-voltage MOSFET in 12V/500mA designs. |
| Thermal Shutdown | +160°C junction temperature - protects against sustained overload; auto-recovery at +140°C enables hiccup-mode fault handling. |
Pinout & Package
MAX5033CUSA+T is housed in an 8-pin SO (Small Outline) package with JEDEC MS-012AC footprint (5.0mm × 6.2mm, 1.75mm height), rated for 0°C to +85°C operating temperature and 170°C/W junction-to-ambient thermal resistance. The lead(Pb)-free variant is marked with "+" suffix and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BST | Bootstrap capacitor connection | Connects 0.1μF ceramic cap to LX; supplies gate drive voltage for internal high-side DMOS; critical for startup and duty-cycle stability. |
| 2 - VD | Internal regulator output | Provides ~7.8V regulated supply for internal analog/digital circuitry; must be bypassed to GND with 0.1μF ceramic capacitor. |
| 3 - SGND | Signal ground reference | Internal analog ground node; must be connected directly to system GND plane-separate from power ground traces to minimize noise coupling. |
| 4 - FB | Feedback sense input | Internally tied to 12V output; no external resistor divider needed-enables plug-and-play 12V regulation without calibration. |
| 5 - ON/OFF | Shutdown control input | Logic-level enable: <1.5V = shutdown (10μA ISHDN), >1.69V = active; includes 100mV hysteresis to prevent chatter near threshold. |
| 6 - GND | Power ground return | Main return path for switch current and output capacitor; must be star-connected to SGND and rectifier anode to minimize ground bounce. |
| 7 - VIN | Main input supply | Accepts 15–76V DC; requires low-ESR input capacitor (e.g., 47μF aluminum + 0.1μF ceramic) placed adjacent to pin to suppress ripple. |
| 8 - LX | Switch node | Drain of internal high-side DMOS; connects to inductor and Schottky rectifier cathode; high dv/dt node-requires tight layout and minimal trace length. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-voltage DMOS switch | 0.4Ω RDS(ON) enables self-contained 12V/500mA conversion without external MOSFET-reducing BOM count and PCB area. |
| Internal Type-3 compensation | Eliminates external compensation network; ensures stable loop response with standard LC filter components (e.g., 220μH + 33μF). |
| Pulse-skipping light-load mode | Maintains >85% efficiency at 10mA load-critical for battery-backed or always-on industrial sensors with intermittent activity. |
| Hiccup-mode short-circuit protection | Shuts down during output fault, cools, then retries-prevents thermal runaway and enables safe recovery without manual reset. |
| Programmable undervoltage lockout | ON/OFF pin accepts external resistor divider to set custom UVLO threshold (e.g., 13V min for 12V output), improving system-level brownout immunity. |
Applications
| Industrial Sensor Power Supply | Railway Signaling Interface |
|---|---|
Use Scenario: Powers isolated 4–20mA transmitters and RS-485 nodes in factory-floor PLC cabinets exposed to 48V DC bus fluctuations and EMI. IC Role / Device Role / Timing Role: Primary 12V point-of-load regulator converting unregulated 48V rail to clean, protected 12V for analog front-end and digital logic. Use Value: 76V absolute max rating withstands load-dump transients; 94% efficiency minimizes heat in sealed enclosures; hiccup-mode prevents latch-up during cable short events. |
Use Scenario: Supplies 12V to LED status indicators and optocoupler drivers in trackside signaling controllers operating from 24–72V nominal traction power. IC Role / Device Role / Timing Role: Fixed-output buck converter providing stable 12V under wide-input, high-temperature conditions (−40°C to +85°C). Use Value: SO-8 package meets vibration requirements; 15V minimum input avoids dropout during brownouts; internal UVLO prevents erratic startup during voltage sag. |
| Distributed Telecom Backup Power | Automotive Diagnostic Tool Power |
Use Scenario: Generates 12V from 48V telecom backup battery during AC mains failure, powering remote management modules and fan controllers. IC Role / Device Role / Timing Role: High-efficiency DC-DC stage enabling >24-hour runtime on battery; operates continuously in pulse-skipping mode at light loads. Use Value: 270μA quiescent current extends battery life; thermal shutdown protects against enclosure overheating during extended discharge cycles. |
Use Scenario: Powers USB host controller and CAN transceiver in handheld OBD-II diagnostic tools drawing from vehicle 12V/24V battery with cranking dips. IC Role / Device Role / Timing Role: Input-tolerant step-down regulator delivering regulated 12V despite cold-cranking dips to 6V and load-dump spikes to 60V. Use Value: 76V max input survives ISO 7637-2 pulse 5a; ON/OFF pin allows MCU-controlled sleep/wake cycling to reduce parasitic drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output, high-input-voltage buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5017MM/NOPB | 4.5–75V input, adjustable output (1.215V–75V), 600mA IOUT, requires external compensation and feedback resistors. | Requires design effort to configure 12V output; lacks internal UVLO programming; higher BOM cost due to external components. | Choose when adjustable output or higher current is needed; avoid if fixed 12V simplicity and minimal external parts are priorities. |
| TPS54360DDAR | 3.5–60V input, adjustable output, 3.5A IOUT, integrated compensation, but no internal high-side FET driver bootstrap support. | Cannot directly replace MAX5033CUSA+T's BST/LX architecture; requires external bootstrap diode/capacitor; larger solution size. | Prefer for higher-current 12V rails (>500mA); not suitable for space-constrained layouts relying on MAX5033CUSA+T's integrated gate drive. |
Compared with LM5017MM/NOPB and TPS54360DDAR, MAX5033CUSA+T offers true plug-and-play 12V regulation with zero external feedback components, optimized thermal performance in SO-8, and native support for 76V transients-making it superior for cost-sensitive, compact industrial 12V PoL designs where fixed output suffices.
Availability
MAX5033CUSA+T is available at Aetrix Electronics and suitable for industrial sensor power supplies, railway signaling interfaces, distributed telecom backup systems, and automotive diagnostic tool power requiring stable component supply across extended temperature and high-voltage stress conditions.
Supply support for MAX5033CUSA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX5033 series was designed specifically for high-input-voltage, space-constrained DC-DC conversion in industrial and transportation systems-emphasizing ruggedness, integration, and ease of use over wide input ranges.
FAQ
What is the minimum input voltage required for MAX5033CUSA+T to regulate 12V output?
The MAX5033CUSA+T requires a minimum input voltage of 15V to maintain regulation at its fixed 12V output, as specified in the Electrical Characteristics table. Below 15V, output voltage drops linearly due to duty-cycle limitation and internal UVLO behavior-even though the absolute maximum rating allows down to 5.2V startup. This constraint ensures stable operation across full load and temperature ranges.
Can MAX5033CUSA+T be used with an input voltage higher than 76V?
No-MAX5033CUSA+T has an absolute maximum input voltage rating of +80V, but its guaranteed operational range is strictly 15V to 76V. Exceeding 76V risks violating the device's electrical specifications, potentially causing premature failure or unpredictable regulation. For applications with transient spikes above 76V, external clamping (e.g., TVS diode) is mandatory before the VIN pin.
Does MAX5033CUSA+T require external compensation components?
No-MAX5033CUSA+T includes fully integrated Type-3 compensation, eliminating the need for external capacitors or resistors in the feedback loop. This simplifies design and improves reliability, especially in high-vibration or thermally cycling environments where external passive drift could degrade regulation accuracy.
What is the thermal derating behavior of MAX5033CUSA+T in its SO-8 package?
MAX5033CUSA+T in SO-8 has a thermal resistance θJA of 170°C/W. Its continuous power dissipation is derated at 5.9mW/°C above +70°C, resulting in a maximum usable power of 471mW at +70°C ambient. At +85°C ambient, usable power drops to ~382mW-limiting practical 12V output current to ~320mA without forced airflow or copper pour heatsinking.
How does the ON/OFF pin function in MAX5033CUSA+T, and what voltage levels activate it?
The ON/OFF pin of MAX5033CUSA+T enables logic-controlled shutdown: pulling it below 1.50V (min) places the device in shutdown mode with 10μA supply current, while driving it above 1.69V (typ) with ≥100mV hysteresis enables normal operation. It accepts voltages up to 76V, allowing direct connection to VIN through a resistor divider for programmable UVLO or microcontroller GPIO control.
MAX5033CUSA+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:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 15V
- Voltage - Input (Max):
- 76V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 125kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX5033CUSA+T FAQ
1.How can I place an order for MAX5033CUSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5033CUSA+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 MAX5033CUSA+T reliable?
The price and inventory of MAX5033CUSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5033CUSA+T is usually 5 days.
3.What payment methods are accepted for MAX5033CUSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5033CUSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5033CUSA+T?
MAX5033CUSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5033CUSA+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 MAX5033CUSA+T?
For technical support, including MAX5033CUSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5033CUSA+T requirements.
6.How does Aetrix verify that MAX5033CUSA+T is sourced from the original manufacturer or authorized distributors?
All MAX5033CUSA+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 MAX5033CUSA+T meets industry standards.
7.What is the process for return or replacement of MAX5033CUSA+T?
All MAX5033CUSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5033CUSA+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 MAX5033CUSA+T part is unused and in its original packaging.
Return procedure for MAX5033CUSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX5033CUSA+T Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
