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Analog Devices Inc./Maxim Integrated MAX5033CASA+T
- Part No.:
- MAX5033CASA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5033CASA+T.pdf
- Description:
- IC REG BUCK 12V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,254
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Product details
Overview
MAX5033CASA+T from Maxim Integrated is a high-voltage, fixed-output 12V step-down DC-DC converter with internal 0.4Ω high-side DMOS FET, 7.5V–76V input range, 500mA output current capability, and automotive-grade -40°C to +125°C operation in 8-pin SO package. It delivers up to 94% efficiency at 24VIN/12VOUT/500mA and supports distributed power systems in harsh environments.
For engineers reviewing the MAX5033CASA+T datasheet, MAX5033CASA+T pinout, MAX5033CASA+T application, or MAX5033CASA+T equivalent, key selection criteria include its 12V fixed output, 125kHz PWM/pulse-skipping operation, 270μA no-load quiescent current, integrated thermal shutdown, and compatibility with external Schottky rectifiers for industrial and automotive power rails.
Technical Context
The MAX5033CASA+T employs voltage-mode control with feed-forward compensation and an internal high-side DMOS switch, enabling stable regulation across wide input ranges (15V–76V for 12V output). Its fixed 125kHz switching frequency transitions to pulse-skipping mode below ~65mA load to maintain high light-load efficiency.
It integrates undervoltage lockout (5.2V typ), cycle-by-cycle current limit (1.5A typ), hiccup-mode short-circuit protection, and thermal shutdown at +160°C with +20°C hysteresis. The device uses internal frequency compensation and requires only a 0.1μF BST capacitor and external Schottky diode for full implementation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 15V to 76V - supports 24V/36V/48V industrial bus rails and automotive cold-crank tolerance |
| Output Voltage | 12.0V ±3.0% (11.64V–12.36V) - tightly regulated fixed output for downstream 12V logic or analog circuitry |
| Max Output Current | 500mA - limited by package thermal dissipation (471mW at +70°C, SO-8) |
| Switching Frequency | 125kHz (105–137kHz) - enables compact magnetics while minimizing EMI in noise-sensitive systems |
| Quiescent Current | 270μA (typ) at no load - extends battery life in always-on monitoring or telemetry applications |
| Shutdown Current | 10μA (typ) - enables ultra-low-power system-level sleep modes |
| Internal Switch RDS(ON) | 0.4Ω (typ) - reduces conduction loss and eliminates need for external high-voltage MOSFET |
Pinout & Package
MAX5033CASA+T is housed in an 8-pin SO (Small Outline) package with JEDEC MS-012AC footprint, 1.27mm pitch, and exposed pad not electrically connected. Thermal resistance θJA = 170°C/W (JEDEC 51).
| 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 bias for internal circuitry; bypass to GND with 0.1μF ceramic capacitor |
| 3 - SGND | Signal ground reference | Must be tied directly to system ground plane; separates analog and power return paths |
| 4 - FB | Feedback input | Connected directly to VOUT for 12V fixed output; internal 1.22V reference sets regulation point |
| 5 - ON/OFF | Enable/shutdown control | Logic-high (>1.69V) enables operation; logic-low disables switch and reduces IQ to 10μA |
| 6 - GND | Power ground | Main return path for high-current LX switching node and input/output capacitors |
| 7 - VIN | Main input supply | Accepts 15–76V DC; requires low-ESR input capacitor placed adjacent to pin |
| 8 - LX | Switch node | Drives external Schottky diode and inductor; connects internally to source of high-side DMOS |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-voltage DMOS switch | 0.4Ω RDS(ON) enables single-chip 12V buck conversion without external MOSFET or driver |
| Pulse-skipping light-load mode | Reduces quiescent current to 270μA while maintaining >85% efficiency down to 10mA load |
| Automotive temperature grade | -40°C to +125°C operation with guaranteed electrical specs across full range |
| Internal frequency compensation | Eliminates external compensation network; simplifies design and improves stability with standard LC filters |
| Hiccup-mode short-circuit protection | Shuts down on overload, cools, then retries - prevents thermal runaway during sustained fault conditions |
Applications
| Industrial Control Power Supply | Automotive Body Electronics |
|---|---|
|
Use Scenario: Providing regulated 12V rail for PLC I/O modules, sensor transmitters, and fieldbus interfaces operating from 24V or 48V DC distribution buses. IC Role / Device Role / Timing Role: Primary non-isolated step-down regulator converting unregulated industrial bus voltage to stable 12V for analog front-ends and microcontrollers. Use Value: High input voltage range (15–76V) accommodates brownouts and surges; 94% efficiency minimizes heat in enclosed cabinets. |
Use Scenario: Powering door module ECUs, seat controllers, and lighting drivers in 12V vehicle architectures with cold-crank (down to 6V) and load-dump (up to 76V) immunity. IC Role / Device Role / Timing Role: Secondary buck converter deriving clean 12V from battery or alternator output, with UVLO and thermal protection for reliability. Use Value: -40°C to +125°C rating ensures operation under hood; 10μA shutdown current supports low-power sleep states. |
| Distributed Telecom Power | Railway Signaling Equipment |
|
Use Scenario: Local 12V conversion for remote radio units, base station fans, and backhaul interface cards powered from 48V telecom plant batteries. IC Role / Device Role / Timing Role: Point-of-load DC-DC converter delivering 500mA at 12V with minimal external components and high PSRR. Use Value: 125kHz fixed frequency eases EMI filtering; pulse-skipping maintains efficiency during standby traffic periods. |
Use Scenario: Powering safety-critical signaling logic and LED indicators in railway trackside cabinets exposed to wide ambient temperatures and vibration. IC Role / Device Role / Timing Role: Robust primary regulator converting 72V nominal traction supply to isolated 12V logic rail via downstream DC-DC stage. Use Value: Undervoltage lockout prevents erratic behavior during voltage sags; thermal shutdown protects against enclosure overheating. |
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 |
|---|---|---|---|
| LM5017MM/NOPB | 4.5–75V input, 12V fixed output, 600mA, 650kHz switching, no internal compensation | Higher frequency enables smaller inductors but requires external compensation network | Choose LM5017MM/NOPB when board space is constrained and design team has compensation expertise |
| TPS54360DGQR | 3.5–60V input, adjustable 12V output, 3.5A, 100–2500kHz programmable frequency, integrated soft-start | Higher current capability and wider input range but requires external feedback resistors and compensation | Choose TPS54360DGQR when future-proofing for higher load or variable output is required |
Compared with LM5017MM/NOPB and TPS54360DGQR, MAX5033CASA+T offers simpler implementation with internal compensation and fixed 12V output, lower quiescent current (270μA vs. 1.8mA), and automotive temperature qualification - ideal for cost-sensitive, space-constrained, and thermally demanding applications where 500mA is sufficient.
Availability
MAX5033CASA+T is available at Aetrix Electronics and suitable for industrial control power supplies, automotive body electronics, distributed telecom power, and railway signaling equipment requiring stable component supply across extended temperature ranges and high-reliability manufacturing.
Supply support for MAX5033CASA+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 industrial, automotive, communications, and computing markets.
The MAX5033 product line delivers high-efficiency, high-input-voltage buck converters targeting harsh-environment applications where simplicity, reliability, and wide VIN range are critical - especially in automotive and industrial power subsystems.
FAQ
What is the input voltage range supported by the MAX5033CASA+T?
The MAX5033CASA+T supports an input voltage range of 15V to 76V DC for its 12V fixed-output variant. This range is specified to ensure stable regulation and full feature operation - including UVLO, current limiting, and thermal protection - across industrial and automotive supply conditions such as 24V/36V/48V buses and post-regulated 72V traction systems. Operation below 15V is not guaranteed per datasheet.
Does the MAX5033CASA+T require external compensation components?
No, the MAX5033CASA+T includes internal Type-3 frequency compensation optimized for standard LC filter configurations. This eliminates the need for external compensation networks, reducing BOM count and layout complexity. The internal compensation ensures stable closed-loop bandwidth and phase margin when the output is sensed immediately after the primary LC filter, as recommended in the datasheet.
What is the maximum continuous output current of the MAX5033CASA+T?
The MAX5033CASA+T delivers up to 500mA continuous output current under typical thermal conditions (TA ≤ +70°C). At higher ambient temperatures, output current is limited by junction temperature - the SO-8 package has θJA = 170°C/W, and thermal shutdown activates at +160°C. Derating curves in the datasheet show usable current drops to ~350mA at +105°C ambient.
How does the MAX5033CASA+T handle short-circuit conditions?
The MAX5033CASA+T implements hiccup-mode output short-circuit protection. When overcurrent is detected, the device shuts down the internal switch, waits for thermal recovery, then attempts restart. This cycle repeats until the fault clears, preventing destructive power dissipation and enabling safe automatic recovery - unlike latch-off or constant-current limiting schemes that may overheat or require manual reset.
Can the MAX5033CASA+T be used with a 12V input supply?
No - the MAX5033CASA+T is rated for minimum input voltage of 15V when configured for 12V output. Using 12V input violates the specified operating condition and risks failure to regulate or activate undervoltage lockout. For 12V input applications, consider the MAX5033BASA+T (5V output) or alternate regulators with lower VIN minima, such as the MAX5035 series.
MAX5033CASA+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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX5033CASA+T FAQ
1.How can I place an order for MAX5033CASA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5033CASA+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 MAX5033CASA+T reliable?
The price and inventory of MAX5033CASA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5033CASA+T is usually 5 days.
3.What payment methods are accepted for MAX5033CASA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5033CASA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5033CASA+T?
MAX5033CASA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5033CASA+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 MAX5033CASA+T?
For technical support, including MAX5033CASA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5033CASA+T requirements.
6.How does Aetrix verify that MAX5033CASA+T is sourced from the original manufacturer or authorized distributors?
All MAX5033CASA+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 MAX5033CASA+T meets industry standards.
7.What is the process for return or replacement of MAX5033CASA+T?
All MAX5033CASA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5033CASA+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 MAX5033CASA+T part is unused and in its original packaging.
Return procedure for MAX5033CASA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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