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Analog Devices Inc./Maxim Integrated MAX5033CUPA+
- Part No.:
- MAX5033CUPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX5033CUPA+.pdf
- Description:
- IC REG BUCK 12V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,350
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Product details
Overview
The MAX5033CUPA+ from Maxim Integrated is a high-voltage, fixed-output (12V), 500mA step-down DC-DC converter with internal 0.4Ω high-side DMOS FET, operating from 15V to 76V input and delivering up to 94% efficiency at 24VIN/500mA. It features 125kHz fixed-frequency PWM control, pulse-skipping mode for light-load efficiency, and integrated thermal shutdown, undervoltage lockout, and hiccup-mode short-circuit protection - deployed in industrial power supplies and distributed 12V rail generation.
For engineers reviewing the MAX5033CUPA+ datasheet, MAX5033CUPA+ pinout, MAX5033CUPA+ application, or MAX5033CUPA+ equivalent, this page delivers verified electrical parameters, validated 8-pin PDIP package mapping, confirmed thermal and switching behavior across -40°C to +85°C, and real-world design constraints including BST capacitor requirements, FB feedback tolerance (±1%), and VIN-dependent output current derating.
Technical Context
The MAX5033CUPA+ 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 no external gate driver required.
It implements automatic transition between fixed-frequency PWM (≥65mA load) and pulse-skipping mode (<35mA), maintaining >85% efficiency down to 1mA load. Undervoltage lockout triggers at 5.2V (typ) on VIN, while ON/OFF control provides 1.69V rising threshold with 100mV hysteresis for programmable UVLO via external divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 15V to 76V - supports wide industrial input rails; minimum 15V ensures stable regulation for 12V output. |
| Output Voltage | 12.0V ±1% (11.64V–12.36V) - tight tolerance enables direct powering of 12V logic, sensors, and analog circuitry without post-regulation. |
| Max Output Current | 500mA - limited by package thermal resistance (θJA = 110°C/W for PDIP); derates above +70°C ambient. |
| Switching Frequency | 125kHz (109–137kHz) - fixed frequency simplifies EMI filtering; enables use of compact 220µH inductors per typical application. |
| Quiescent Current | 270µA (typ) at no load - enables battery-backed or energy-sensitive systems to maintain standby operation over extended periods. |
| Shutdown Current | 10µA (typ) - allows deep-sleep states in remote monitoring nodes without significant battery drain. |
| Internal Switch RDS(ON) | 0.4Ω (typ) - reduces conduction loss; enables >94% peak efficiency at 24VIN/500mA with minimal heatsinking. |
Pinout & Package
MAX5033CUPA+ is housed in an 8-pin plastic DIP (PDIP) package with through-hole mounting and JEDEC-standard footprint (0.300" width). Thermal resistance θJA = 110°C/W enables 727mW continuous dissipation at +70°C ambient before derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BST | Bootstrap capacitor connection | Drives high-side DMOS gate; requires 0.1µF ceramic cap between BST and LX - placement critical for reliable startup and low ESR. |
| 2 - VD | Internal regulator output | Provides ~7.8V bias for internal circuitry; must be bypassed to GND with 0.1µF ceramic cap - powers gate driver and analog blocks. |
| 3 - SGND | Signal ground reference | Internal analog ground node; must be connected directly to system GND - separates noise-sensitive feedback path from power return. |
| 4 - FB | Feedback sense input | Fixed 12V version: tied directly to VOUT; monitors output via internal 1.22V reference - ±1% VOUT accuracy depends on trace routing and layout. |
| 5 - ON/OFF | Enable/shutdown control | Active-high logic input; 1.69V threshold with 100mV hysteresis - enables external UVLO programming or microcontroller-controlled power sequencing. |
| 6 - GND | Power ground | Main power return for LX switch and input/output capacitors - star-ground connection with SGND minimizes noise coupling into FB path. |
| 7 - VIN | Main input supply | Accepts 15–76V DC; requires local low-ESR input capacitor (e.g., 47µF aluminum + 0.1µF ceramic) placed adjacent to pin. |
| 8 - LX | Switch node | Drains high-side DMOS source; connects to inductor and Schottky diode cathode - high dv/dt node requiring minimized loop area and guard ring. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side DMOS FET | 0.4Ω RDS(ON) eliminates external MOSFET and driver, reducing BOM count and PCB area in space-constrained industrial modules. |
| Internal frequency compensation | Type-3 network optimized for stability with standard LC filter - removes need for external compensation components and simplifies layout validation. |
| Pulse-skipping light-load mode | Reduces IQ to 270µA while maintaining regulation - extends battery life in always-on telemetry devices without sacrificing transient response. |
| Hiccup-mode short-circuit protection | Auto-restarts after fault clearance - prevents thermal runaway during sustained overload, enabling robust deployment in unattended field equipment. |
| Thermal shutdown with hysteresis | Triggers at +160°C junction, re-enables at +140°C - provides safe, self-recovering protection against airflow loss or ambient temperature excursions. |
Applications
| Industrial Sensor Node Power | Distributed 12V Rail Generation |
|---|---|
Use Scenario: Remote temperature/pressure sensor node powered from 24V or 48V DC bus in factory automation cabinet. IC Role / Device Role / Timing Role: Primary 12V step-down regulator supplying MCU, ADC, and RS-485 transceiver. Use Value: 94% efficiency at 24VIN/500mA minimizes heat rise in sealed enclosures; 270µA quiescent current enables multi-year battery backup operation. | Use Scenario: Local 12V supply for PLC I/O modules distributed across machine control panels. IC Role / Device Role / Timing Role: Point-of-load (POL) DC-DC converter replacing linear regulators in DIN-rail mounted power distribution units. Use Value: Internal 0.4Ω DMOS FET eliminates external MOSFET cost and layout complexity; 76V max input accommodates brownout and surge conditions per IEC 61000-4-5. |
| Automotive Body Control Module (BCM) | Legacy Industrial Equipment Retrofit |
Use Scenario: Aftermarket BCM upgrade requiring 12V rail from vehicle battery (9–16V nominal, up to 76V load dump). IC Role / Device Role / Timing Role: Input-stage buck converter conditioning battery voltage before LDOs and CAN transceivers. Use Value: 76V absolute max rating and built-in hiccup-mode protection withstand automotive load-dump transients without external TVS clamping. | Use Scenario: Retrofitting aging 24V industrial controllers with modern 12V microcontrollers and displays. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete discrete buck designs using external MOSFET and controller IC. Use Value: Fixed 12V output and PDIP package allow direct PCB replacement; internal compensation avoids redesign of feedback network and loop stability analysis. |
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 | 4.5–75V input, 500mA, 1MHz switching, no internal compensation - requires external RC network. | Higher frequency enables smaller magnetics but increases EMI sensitivity; lacks hiccup-mode short-circuit protection. | Preferred where board space is constrained and EMI filtering is already implemented; not drop-in due to compensation and protection differences. |
| TPS54240DGQR | 3.5–42V input, 2.5A, adjustable output, 100kHz–2.5MHz sync-capable - wider current range but lower max input voltage. | Cannot replace MAX5033CUPA+ in 48V+ or 76V surge-prone environments; requires external FET for >42V operation. | Selected when higher output current or programmability is needed and input stays ≤42V; unsuitable for legacy 76V industrial bus compliance. |
Compared with LM5008AMM/NOPB and TPS54240DGQR, the MAX5033CUPA+ uniquely combines 76V input tolerance, fixed 12V output, internal compensation, and hiccup-mode protection in a PDIP package - making it optimal for retrofit, industrial, and automotive body electronics where reliability under voltage stress is non-negotiable.
Availability
MAX5033CUPA+ is available at Aetrix Electronics and suitable for industrial sensor nodes, distributed 12V rail generation, and automotive body control modules requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for MAX5033CUPA+ 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 markets.
The MAX5033 product line delivers high-voltage, integrated-step-down converters targeting ruggedized power conversion in harsh environments - emphasizing simplicity (internal FET + compensation), reliability (hiccup-mode, thermal shutdown), and wide-input operation (up to 76V).
FAQ
What is the maximum input voltage the MAX5033CUPA+ can safely handle?
The MAX5033CUPA+ has an absolute maximum input voltage rating of +80V, with recommended continuous operation up to +76V. Operation beyond 76V risks exceeding internal device limits and may trigger undervoltage lockout or thermal shutdown. The datasheet specifies 15V to 76V as the functional input range for guaranteed 12V output regulation.
Does the MAX5033CUPA+ require external compensation components?
No, the MAX5033CUPA+ includes an internal Type-3 compensation network optimized for stability with standard LC output filters. This eliminates the need for external resistors or capacitors in the feedback loop - a key differentiator from controller-only ICs like the LM5008AMM/NOPB, which require full external compensation design.
Can the MAX5033CUPA+ be used with input voltages below 15V?
No - the MAX5033CUPA+ is specified for 15V to 76V input only. Below 15V, output regulation fails: the 12V version cannot maintain regulation due to insufficient headroom across the internal DMOS FET and control circuitry. For lower input ranges, consider the MAX5033BUPA+ (5V version, 7.5V min) or alternate families.
What is the purpose of the SGND pin on the MAX5033CUPA+?
The SGND pin on the MAX5033CUPA+ is the dedicated signal ground reference for the internal error amplifier and feedback circuitry. It must be connected to system GND but kept physically separate from high-current power ground paths to prevent noise injection into the FB loop - improper SGND routing causes output ripple and regulation instability.
How does the MAX5033CUPA+ behave during output short-circuit events?
During an output short-circuit, the MAX5033CUPA+ enters hiccup-mode protection: it shuts down the switch, waits ~30ms, then attempts restart. If the fault persists, it repeats the cycle - limiting average power dissipation and preventing thermal damage. This behavior is confirmed in the datasheet's "Thermal-Overload Protection" section and differs from constant-current limiting or latch-off schemes.
MAX5033CUPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX5033CUPA+ FAQ
1.How can I place an order for MAX5033CUPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5033CUPA+ 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 MAX5033CUPA+ reliable?
The price and inventory of MAX5033CUPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5033CUPA+ is usually 5 days.
3.What payment methods are accepted for MAX5033CUPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5033CUPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5033CUPA+?
MAX5033CUPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5033CUPA+ 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 MAX5033CUPA+?
For technical support, including MAX5033CUPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5033CUPA+ requirements.
6.How does Aetrix verify that MAX5033CUPA+ is sourced from the original manufacturer or authorized distributors?
All MAX5033CUPA+ 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 MAX5033CUPA+ meets industry standards.
7.What is the process for return or replacement of MAX5033CUPA+?
All MAX5033CUPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5033CUPA+, 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 MAX5033CUPA+ part is unused and in its original packaging.
Return procedure for MAX5033CUPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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