My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX5033CASA+
- Part No.:
- MAX5033CASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5033CASA+.pdf
- Description:
- IC REG BUCK 12V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:785
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX5033CASA+ from Maxim Integrated is a high-voltage, fixed-output 12V step-down DC-DC converter with internal 0.4Ω high-side DMOS FET, operating from 15V to 76V input and delivering up to 500mA output current. It features 125kHz fixed-frequency PWM operation, pulse-skipping mode for light-load efficiency, and automotive-grade -40°C to +125°C operation in an 8-pin SO package. Used in distributed power supplies for industrial control systems requiring robust input voltage tolerance and low quiescent current.
For engineers reviewing the MAX5033CASA+ datasheet, MAX5033CASA+ pinout, MAX5033CASA+ application, or MAX5033CASA+ equivalent, key selection criteria include its 12V fixed output, 76V max input rating, thermal shutdown at +160°C, 270μA no-load quiescent current, and compatibility with external Schottky rectifiers like 50SQ100 for high-efficiency buck conversion.
Technical Context
The MAX5033CASA+ implements voltage-mode control with feed-forward compensation and integrates a high-voltage DMOS switch with 0.4Ω RDS(ON). Its internal 7.8V regulator (VD) powers gate drive and analog circuitry, while BST pin enables bootstrap gate drive for the high-side switch using a 0.1μF ceramic capacitor.
It operates in fixed-frequency PWM mode above ~65mA load and automatically transitions to pulse-skipping mode below that threshold to maintain >85% efficiency at light loads. Protection includes cycle-by-cycle current limit (1.5A typ), hiccup-mode short-circuit response, undervoltage lockout (5.2V typ), and thermal shutdown with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 15V to 76V - supports wide industrial and automotive battery inputs; UVLO activates below 5.2V (typ) to prevent erratic startup |
| Output Voltage | 12.0V ±3.0% (11.64V–12.42V) - tightly regulated fixed output suitable for powering logic, sensors, and interface ICs |
| Max Output Current | 500mA - limited by thermal dissipation in SO package (471mW @ +70°C); peak switch current limit is 1.5A (typ) |
| Quiescent Current | 270μA (typ) at no load - enables long standby life in battery-powered or energy-sensitive systems |
| Switching Frequency | 125kHz (105–137kHz over temp) - balances EMI, inductor size, and efficiency; enables use of compact 220μH–330μH inductors |
| Efficiency | 94% (typ) at 24VIN/12VOUT/500mA - achieved via low-RDS(ON) FET and optimized control architecture |
| Operating Temp Range | -40°C to +125°C - qualified for under-hood automotive and harsh industrial environments |
Pinout & Package
MAX5033CASA+ 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 voltage for internal high-side DMOS switch |
| 2 - VD | Internal regulator output | Provides ~7.8V bias for internal circuitry; must be bypassed to GND with 0.1μF ceramic capacitor |
| 3 - SGND | Signal ground reference | Internal analog ground node; must be tied directly to system GND to ensure stable feedback and regulation |
| 4 - FB | Feedback input | Connected directly to VOUT for fixed 12V operation; senses output to maintain regulation via internal 1.22V reference |
| 5 - ON/OFF | Shutdown control | Logic-level enable: <1.5V = shutdown (10μA ISHDN), >1.69V = active; 100mV hysteresis prevents chatter |
| 6 - GND | Power ground | Main return path for high-current switching loop; star-ground connection with LX, D1 cathode, and CIN critical for EMI control |
| 7 - VIN | Main power input | Accepts 15–76V DC; requires low-ESR input capacitor (e.g., 47μF aluminum + 0.1μF ceramic) placed near pin |
| 8 - LX | Switch node | Drain of internal high-side DMOS; connects to inductor and Schottky diode anode; high dv/dt node requiring tight layout |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.4Ω high-voltage DMOS FET | Eliminates external MOSFET and driver, reducing BOM count and PCB area while enabling 76V operation |
| Internal frequency compensation | Enables stable closed-loop operation with standard LC filter without external compensation network |
| Pulse-skipping light-load mode | Maintains >85% efficiency down to ~10mA load, critical for always-on industrial monitoring nodes |
| Hiccup-mode short-circuit protection | Limits average power during sustained overload, preventing thermal runaway without latch-off or manual reset |
| Automotive temperature grade (-40°C to +125°C) | Qualified per AEC-Q100 stress test conditions; supports under-dash, engine bay, and rail applications |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Powers microcontrollers, CAN transceivers, and analog sensors in programmable logic controllers operating from 24V or 48V DC bus. IC Role / Device Role / Timing Role: Primary 12V intermediate rail generator; replaces discrete buck controller + MOSFET solution. Use Value: Withstands 76V load dump transients and maintains regulation across wide input range, eliminating need for upstream pre-regulator. |
Use Scenario: Supplies 12V to body electronics including door modules, lighting drivers, and LIN transceivers in vehicles with 12V battery systems. IC Role / Device Role / Timing Role: High-reliability DC-DC converter for safety-critical subsystems requiring extended temperature operation. Use Value: -40°C to +125°C rating and thermal shutdown with 20°C hysteresis ensure fail-safe behavior during under-hood thermal excursions. |
| Distributed Telecom Power | Railway Signaling Interface |
Use Scenario: Generates local 12V rails for remote I/O units and fieldbus interfaces in telecom cabinets powered from -48V or 72V DC distribution. IC Role / Device Role / Timing Role: Isolated secondary-side buck converter; paired with isolated DC-DC front-end for reinforced insulation. Use Value: 270μA quiescent current minimizes standby losses in unattended equipment; pulse-skipping extends battery backup runtime. |
Use Scenario: Powers signaling logic and optocouplers in trackside electronic interlocking systems operating from 110V DC traction supply. IC Role / Device Role / Timing Role: Robust primary-side step-down regulator tolerant of high-voltage surges and long-term DC stress. Use Value: 76V absolute max input rating and 1.5A peak current limit provide margin against 110V line transients and inductive kickback. |
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 |
|---|---|---|---|
| LM5009AMM/NOPB | Fixed 12V output, 80V max input, 500mA, but uses external MOSFET and requires full compensation network | Suitable where design flexibility and thermal separation are prioritized over BOM simplicity | Choose LM5009AMM/NOPB if board space allows external FET and layout can accommodate compensation tuning. |
| TPS54340DDAR | Adjustable output (1.22V–60V), 42V max input, 3.5A output, integrated FET, but lacks automotive temp grade | Better for higher-current, lower-input applications where adjustable VOUT and wider duty cycle are needed | Choose TPS54340DDAR only for non-automotive designs requiring >500mA or sub-12V outputs; not rated for -40°C to +125°C. |
Compared with LM5009AMM/NOPB and TPS54340DDAR, the MAX5033CASA+ offers the only single-chip, automotive-grade, fixed-12V solution with 76V input capability and integrated compensation - simplifying design validation and reducing component count in harsh-environment power rails.
Availability
MAX5033CASA+ 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 traceable sourcing.
Supply support for MAX5033CASA+ 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 as a family of high-input-voltage, integrated-FET buck converters targeting space-constrained, high-reliability power supplies in automotive and industrial settings - emphasizing ease of use, thermal robustness, and minimal external components.
FAQ
What is the maximum input voltage the MAX5033CASA+ can withstand?
The MAX5033CASA+ has an absolute maximum input voltage rating of +80V, with recommended continuous operation up to +76V. Its undervoltage lockout activates at 5.2V (typ), and it is specifically characterized for 15V to 76V input range in the MAX5033C variant. Exceeding 76V may trigger thermal shutdown or reduce lifetime reliability.
Does the MAX5033CASA+ require external compensation components?
No, the MAX5033CASA+ includes internal frequency compensation optimized for stability with standard LC output filters. The datasheet explicitly states "internal compensation" and advises against adding external compensation networks - doing so may degrade phase margin or cause oscillation.
Can the MAX5033CASA+ be used with a 12V nominal input source?
No - the MAX5033CASA+ requires minimum 15V input for proper regulation, as specified in its Electrical Characteristics table. For 12V nominal inputs (e.g., automotive battery), the MAX5033BASA+ (5V version) or MAX5033AASA+ (3.3V version) are appropriate alternatives with 7.5V min input.
What Schottky diode is recommended for use with the MAX5033CASA+?
The MAX5033CASA+ datasheet specifies 50SQ100 (IR) as the recommended Schottky rectifier for 15–76V input operation. It provides adequate 100V reverse voltage rating and low forward voltage (<0.45V at full load), preventing conduction through the internal body diode and minimizing thermal stress on the IC.
How does the MAX5033CASA+ behave during thermal overload?
When junction temperature exceeds +160°C, the MAX5033CASA+ enters thermal shutdown, turning off the internal DMOS switch. It remains latched off until die temperature falls to +140°C (20°C hysteresis), then resumes switching - producing a pulsed output during sustained overload rather than permanent latch-off.
MAX5033CASA+ 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:
- 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+ FAQ
1.How can I place an order for MAX5033CASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5033CASA+ 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+ reliable?
The price and inventory of MAX5033CASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5033CASA+ is usually 5 days.
3.What payment methods are accepted for MAX5033CASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5033CASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5033CASA+?
MAX5033CASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5033CASA+ 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+?
For technical support, including MAX5033CASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5033CASA+ requirements.
6.How does Aetrix verify that MAX5033CASA+ is sourced from the original manufacturer or authorized distributors?
All MAX5033CASA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX5033CASA+?
All MAX5033CASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5033CASA+, 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+ part is unused and in its original packaging.
Return procedure for MAX5033CASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX5033CASA+ 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…
