My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX5033DUSA+
- Part No.:
- MAX5033DUSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5033DUSA+.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,265
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX5033DUSA+ from Maxim Integrated is a high-voltage, adjustable-output step-down DC-DC converter with 7.5V–76V input range, internal 0.4Ω high-side DMOS FET, 500mA output current capability, fixed 125kHz PWM switching (with pulse-skipping at light loads), and operation over 0°C to +85°C. It delivers stable 1.25V–13.2V output in space-constrained industrial power supplies.
For engineers reviewing the MAX5033DUSA+ datasheet, MAX5033DUSA+ pinout, MAX5033DUSA+ application, or MAX5033DUSA+ equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency and thermal behavior, and real-world design constraints for high-input-voltage buck conversion.
Technical Context
The MAX5033DUSA+ implements voltage-mode control with feed-forward compensation and integrates a high-voltage n-channel DMOS switch rated for 76V drain-source. Its internal 7.8V regulator powers gate drive and analog circuitry, enabling bootstrap-based high-side drive via BST/LX.
It features automatic transition between fixed-frequency PWM and pulse-skipping mode below ~65mA load, achieving 270μA quiescent current at no load and 10μA shutdown current. Protection includes cycle-by-cycle current limit (1.5A typ), hiccup-mode short-circuit response, undervoltage lockout (5.2V typ), and thermal shutdown at +160°C with +20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 76V - supports wide industrial and automotive battery-derived rails without external pre-regulation. |
| Output Voltage Range | 1.25V to 13.2V (adjustable via FB pin) - enables flexible system-level rail generation with ±1.5% regulation accuracy (1.221V feedback reference). |
| Max Output Current | 500mA - limited by package thermal resistance (SO-8 θJA = 170°C/W) and internal switch RDS(ON) = 0.4Ω (typ). |
| Switching Frequency | 125kHz (fixed PWM) with PFM threshold at 65mA - balances EMI control, inductor size, and light-load efficiency. |
| Quiescent Current | 270μA at no load - enables long-term standby operation in battery-powered remote sensors or IoT nodes. |
| Shutdown Current | 10μA (typ) - ensures minimal leakage during system sleep states without external disconnect switches. |
| Efficiency | 90% at VIN=12V, VOUT=5V, IOUT=500mA - achieved via low-RDS(ON) switch and optimized gate drive architecture. |
Pinout & Package
MAX5033DUSA+ is housed in an 8-pin SO (Small Outline) package with gull-wing leads, JEDEC MS-012AC compliant, and rated for 0°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BST | Bootstrap capacitor connection | Connects 0.1μF ceramic capacitor to LX to generate gate voltage for internal high-side DMOS switch; critical for proper startup and continuous conduction. |
| 2 - VD | Internal regulator output | Provides regulated ~7.8V supply for internal analog and gate-drive 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 power ground (GND) to maintain feedback accuracy and stability. |
| 4 - FB | Feedback input | Senses output voltage via external resistor divider; regulates VOUT to 1.221V reference; bias current <±150nA minimizes divider error. |
| 5 - ON/OFF | Enable/shutdown control | Logic-level input with 1.69V rising threshold and 100mV hysteresis; drives low (<0.3V) to enter 10μA shutdown state. |
| 6 - GND | Power ground | Main return path for high-current switch node and output capacitor; requires low-impedance connection to SGND and PCB ground plane. |
| 7 - VIN | Main input supply | Accepts 7.5V–76V DC input; requires local low-ESR bulk 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 external Schottky diode cathode; experiences full VIN-to-GND swing at 125kHz. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-voltage DMOS switch | 0.4Ω RDS(ON) at 500mA enables >90% efficiency without external MOSFET, reducing BOM count and layout complexity. |
| Internal frequency compensation | Optimized Type III compensation eliminates need for external compensation network, ensuring stable loop response across all operating conditions. |
| Pulse-skipping light-load mode | Reduces IQ to 270μA while maintaining regulation, extending battery life in intermittent-duty applications like telemetry transmitters. |
| Robust protection suite | Includes cycle-by-cycle current limit (1.5A), hiccup-mode short-circuit recovery, UVLO (5.2V), and thermal shutdown (+160°C) with auto-restart. |
| Adjustable output with precision reference | 1.221V ±0.029V feedback reference enables accurate 1.25V–13.2V output setting using standard 1% resistors and minimal board area. |
Applications
| Industrial Sensor Node Power | Rail Generator for PLC I/O Modules |
|---|---|
|
Use Scenario: Powering 3.3V microcontroller, RS-485 transceiver, and analog sensor front-end from a 24V or 48V field bus in harsh factory environments. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering clean, regulated 3.3V/5V from wide-input industrial rail. Use Value: Eliminates need for external high-voltage MOSFET and compensation components; 76V max input withstands load-dump transients per ISO 7637-2. |
Use Scenario: Generating multiple isolated or semi-isolated auxiliary rails (e.g., 5V for logic, 12V for solenoid drivers) in programmable logic controller backplanes. IC Role / Device Role / Timing Role: High-efficiency pre-regulator stage feeding downstream isolated DC-DC modules or LDOs. Use Value: 90% efficiency at full load reduces heat buildup in dense chassis; 125kHz switching allows compact 220μH inductors and avoids AM-band EMI. |
| Automotive Body Control Unit Supply | Telecom Remote Radio Unit Bias |
|
Use Scenario: Providing 5V supply for CAN transceivers and microcontrollers in body electronics modules powered from 12V battery with cold-crank (6V) and load-dump (80V) stress. IC Role / Device Role / Timing Role: Input-stage buck converter handling wide VIN variation and transient immunity requirements. Use Value: Undervoltage lockout (5.2V) prevents brownout operation during cranking; thermal shutdown protects against enclosure overheating in sealed enclosures. |
Use Scenario: Converting -48V telecom rectified supply to +5V or +12V for RF amplifier bias and digital control circuitry in outdoor base station radios. IC Role / Device Role / Timing Role: High-reliability, high-input-voltage DC-DC stage operating continuously under elevated ambient temperature. Use Value: 0°C to +85°C rating matches telecom environmental specs; 10μA shutdown supports remote firmware updates with zero standby drain. |
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, 75V max input, 350mA output, no integrated bootstrap diode - requires external bootstrap capacitor charge path. | Better suited for compact designs needing higher frequency and smaller magnetics; less tolerant of ultra-low-IQ requirements. | Select when board space is constrained and 500kHz EMI filtering is manageable; avoid if 270μA IQ or hiccup-mode short-circuit behavior is mandatory. |
| TPS54340DDAR | 42V max input, 3.5A output, adjustable frequency (100kHz–2.5MHz), integrated soft-start - lacks 76V rating and automotive temp grade. | Ideal for mid-voltage industrial systems (12–36V) requiring higher current and programmable frequency; not viable for 48V+ battery or PoE++ inputs. | Choose for cost-sensitive, high-current 24V systems where input voltage never exceeds 42V; reject for 76V-capable or extended-temp deployments. |
Compared with LM5008AMM/NOPB and TPS54340DDAR, the MAX5033DUSA+ uniquely combines 76V input tolerance, 270μA no-load IQ, and integrated hiccup-mode protection - making it the only option among the three qualified for unregulated 48V/72V battery and load-dump-prone industrial power rails.
Availability
MAX5033DUSA+ is available at Aetrix Electronics and suitable for industrial sensor nodes, PLC I/O modules, automotive body control units, and telecom remote radio units requiring stable component supply across extended temperature and high-input-voltage conditions.
Supply support for MAX5033DUSA+ 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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX5033 series was engineered specifically for high-input-voltage, low-quiescent-current buck conversion in space- and reliability-constrained systems - emphasizing integrated protection, minimal external components, and robust thermal performance.
FAQ
What is the minimum input voltage required for MAX5033DUSA+ to start regulation?
The MAX5033DUSA+ features an internal undervoltage lockout (UVLO) that enables operation when VIN rises above 5.2V (typical). If an external UVLO divider is used on the ON/OFF pin, the effective threshold can be raised - but the internal 5.2V UVLO remains active unless overridden. Below 5.2V, the MAX5033DUSA+ remains in shutdown regardless of ON/OFF state.
Can MAX5033DUSA+ operate with an output voltage lower than 1.25V?
No. The MAX5033DUSA+ feedback reference is fixed at 1.221V (min 1.192V, max 1.250V), and the datasheet specifies a guaranteed output range of 1.25V to 13.2V. Attempting to set VOUT below 1.25V violates the internal error amplifier's common-mode input range and results in loss of regulation - the MAX5033DUSA+ will not reliably regulate outputs below its specified minimum.
What is the maximum allowable output capacitance for stable startup of MAX5033DUSA+?
The MAX5033DUSA+ has a fixed 400μs internal soft-start time. To prevent output overshoot exceeding 5%, the output capacitance must be ≤68μF. Larger capacitors slow the output rise time beyond the soft-start window, causing the error amplifier to overdrive the switch and induce voltage overshoot - a constraint explicitly called out in the MAX5033DUSA+ datasheet Application Information section.
Does MAX5033DUSA+ require an external Schottky diode, and what are the key selection criteria?
Yes, MAX5033DUSA+ requires an external Schottky rectifier connected from LX to GND. Per the datasheet, it must have: (1) reverse voltage rating > VIN(max) = 76V, (2) forward voltage < 0.45V at max load current, and (3) continuous current rating ≥ 500mA. Recommended parts include 50SQ100 (76V-rated) and B360A (56V-rated for ≤56V inputs).
How does the MAX5033DUSA+ handle thermal overload, and what is the recovery behavior?
When die temperature exceeds +160°C, MAX5033DUSA+ activates thermal shutdown, turning off the internal DMOS switch and entering hiccup mode. It remains latched off until junction temperature falls to +140°C (20°C hysteresis), then automatically resumes switching. This pulsed output behavior prevents permanent damage while allowing passive cooling - a documented feature in the MAX5033DUSA+ Thermal-Shutdown section.
MAX5033DUSA+ 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:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX5033DUSA+ FAQ
1.How can I place an order for MAX5033DUSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5033DUSA+ 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 MAX5033DUSA+ reliable?
The price and inventory of MAX5033DUSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5033DUSA+ is usually 5 days.
3.What payment methods are accepted for MAX5033DUSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5033DUSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5033DUSA+?
MAX5033DUSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5033DUSA+ 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 MAX5033DUSA+?
For technical support, including MAX5033DUSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5033DUSA+ requirements.
6.How does Aetrix verify that MAX5033DUSA+ is sourced from the original manufacturer or authorized distributors?
All MAX5033DUSA+ 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 MAX5033DUSA+ meets industry standards.
7.What is the process for return or replacement of MAX5033DUSA+?
All MAX5033DUSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5033DUSA+, 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 MAX5033DUSA+ part is unused and in its original packaging.
Return procedure for MAX5033DUSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX5033DUSA+ 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…
