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Analog Devices Inc./Maxim Integrated MAX5033DUSA+T
- Part No.:
- MAX5033DUSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX5033DUSA+T.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,352
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Product details
Overview
MAX5033DUSA+T from Maxim Integrated is an adjustable-output, high-voltage (7.5V–76V), 500mA step-down DC-DC converter with internal 0.4Ω high-side DMOS FET, fixed 125kHz PWM operation, and pulse-skipping mode for light-load efficiency. It delivers stable 1.25V–13.2V output in industrial power supplies requiring wide-input, low-quiescent-current regulation.
For engineers reviewing the MAX5033DUSA+T datasheet, MAX5033DUSA+T pinout, MAX5033DUSA+T application, or MAX5033DUSA+T equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and switching characteristics, and real-world design constraints for automotive-grade (-40°C to +85°C) buck converter implementation.
Technical Context
The MAX5033DUSA+T employs voltage-mode control with feed-forward compensation and integrates a high-voltage DMOS switch, eliminating external gate drivers. Its internal 7.8V regulator (VD) powers the bootstrap circuit and analog blocks, enabling reliable high-side gate drive via the BST–LX flying capacitor.
It features automatic transition between PWM and pulse-skipping modes based on load current, with PFM threshold at 35–110mA and quiescent current held to 270μA (typ) at no load. Protection includes undervoltage lockout (5.2V typ), cycle-by-cycle current limit (0.95–2.1A), hiccup-mode short-circuit response, 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 inputs without pre-regulation. |
| Output Voltage Range | 1.25V to 13.2V (adjustable via FB divider) - enables flexible rail generation across logic, analog, and interface circuits. |
| Max Output Current | 500mA - limited by package thermal dissipation (471mW max in SO-8 at +70°C). |
| Switching Frequency | 105–137kHz (typ 125kHz) - balances EMI, inductor size, and efficiency in space-constrained designs. |
| Quiescent Current | 270μA (typ) at no load - extends battery life in always-on systems such as remote sensors or telematics. |
| Shutdown Current | 10μA (typ) - enables ultra-low-power system-level sleep states without external disconnect. |
| Internal Switch RDS(ON) | 0.4Ω (typ) - reduces conduction loss and eliminates need for external high-voltage MOSFET. |
Pinout & Package
MAX5033DUSA+T is housed in an 8-pin SO (Small Outline) package, lead(Pb)-free, with JEDEC-standard footprint and 170°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BST | Bootstrap capacitor connection | Provides gate-drive voltage for internal high-side DMOS; requires 0.1μF ceramic cap to LX for reliable switching. |
| 2 - VD | Internal regulator output | 7.8V regulated supply powering internal logic and BST charging; bypassed to GND with 0.1μF ceramic cap. |
| 3 - SGND | Signal ground reference | Internal analog ground node; must be connected directly to system GND to maintain feedback accuracy. |
| 4 - FB | Feedback input | Senses output via resistive divider; regulates to 1.221V (typ) reference - sets VOUT = 1.221 × (1 + R3/R4). |
| 5 - ON/OFF | Enable/shutdown control | Logic-level input with 1.69V rising threshold and 100mV hysteresis; pulls low to reduce supply current to 10μA. |
| 6 - GND | Power ground | Main return path for high-current switch node and output capacitor; must be star-connected to minimize noise coupling. |
| 7 - VIN | Main input supply | Accepts 7.5V–76V; requires local low-ESR bypass cap (e.g., 47μF aluminum + 0.1μF ceramic) near pin. |
| 8 - LX | Switch node | Drains internal high-side DMOS; connects to inductor and Schottky diode cathode - critical for EMI and layout. |
Key Features
| Feature | Design Value |
|---|---|
| Internal frequency compensation | Eliminates external compensation network - simplifies design and improves stability across 1.25V–13.2V output range. |
| Pulse-skipping light-load mode | Reduces IQ to 270μA while maintaining >80% efficiency at 10mA load - ideal for intermittent-sensing applications. |
| Hiccup-mode short-circuit protection | Disables switching during sustained overload and auto-retries after cooldown - prevents thermal runaway without latch-up. |
| Integrated 7.8V VD regulator | Stabilizes bootstrap and analog bias under wide VIN swing - ensures robust gate drive even at 7.5V input. |
| Thermal shutdown with hysteresis | Shuts down at +160°C and resumes at +140°C - provides safe, self-recovering fault handling in enclosed enclosures. |
Applications
| Industrial Sensor Node Power | Automotive Body Control Module |
|---|---|
|
Use Scenario: Remote temperature/humidity sensor powered from 24V truck battery with wake-on-event operation. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator delivering 500mA peak during RF transmission bursts. Use Value: 270μA quiescent current extends 10-year battery life; 76V input tolerance survives load-dump transients. |
Use Scenario: Centralized power for door-lock actuators, interior lighting, and CAN transceivers in 12V vehicle architecture. IC Role / Device Role / Timing Role: Adjustable 5.0V rail generator supporting multiple sub-systems with shared enable control. Use Value: ON/OFF pin allows synchronized deep-sleep of entire module; hiccup protection handles motor stall faults. |
| Distributed Telecom Power | Programmable Logic Controller (PLC) I/O Supply |
|
Use Scenario: Field-deployed Ethernet switch with PoE-powered uplink and local 5V logic rail derived from 48V backplane. IC Role / Device Role / Timing Role: Secondary 5V step-down stage isolated from primary 48V–57V input domain. Use Value: 125kHz fixed-frequency operation eases EMI filtering; internal DMOS avoids discrete high-voltage MOSFET cost and layout complexity. |
Use Scenario: Modular PLC base unit supplying 3.3V FPGA core and 5V I/O buffers from 24V industrial bus. IC Role / Device Role / Timing Role: Dual-rail generator using two MAX5033DUSA+T devices (one for each output) with independent FB dividers. Use Value: Adjustable output enables precise matching to ASIC voltage tolerances; -40°C to +85°C rating meets EN 61131-2 requirements. |
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 |
|---|---|---|---|
| LM5017MH/NOPB | Fixed 500kHz frequency, 65V max input, requires external compensation, no integrated VD regulator. | Better suited for compact designs needing higher switching frequency; lacks internal bootstrap regulator - needs external charge pump. | Choose LM5017MH/NOPB when board space is constrained and 500kHz operation is acceptable; verify external VDD generation for gate drive. |
| TPS54360DGQR | 60V max input, 3.5A output, adjustable soft-start, no integrated VD or BST driver - requires external high-side FET. | Higher current capability for multi-rail systems; lacks integrated high-voltage switch - increases BOM count and layout sensitivity. | Choose TPS54360DGQR when >500mA load current is required and external MOSFET selection is preferred for thermal optimization. |
Compared with LM5017MH/NOPB and TPS54360DGQR, MAX5033DUSA+T offers lower quiescent current (270μA vs. 100μA–1.5mA), integrated 7.8V VD regulator and BST driver, and wider 76V input - making it optimal for ultra-low-power, high-input-voltage, single-chip buck applications where simplicity and reliability outweigh raw current headroom.
Availability
MAX5033DUSA+T is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, distributed telecom power, and programmable logic controller I/O supplies requiring stable component supply across extended temperature and high-input-voltage conditions.
Supply support for MAX5033DUSA+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 family was designed specifically for high-input-voltage, low-quiescent-current buck conversion in harsh environments - targeting applications where wide VIN range, internal integration, and automotive-grade reliability are mandatory.
FAQ
What is the minimum input voltage required for MAX5033DUSA+T to start regulation?
The MAX5033DUSA+T features internal undervoltage lockout (UVLO) that permits startup when VIN rises above 5.2V (typ). If an external UVLO divider is used on the ON/OFF pin, the effective threshold can be raised - but the absolute minimum for internal UVLO activation remains 5.2V. Below this, the device remains disabled regardless of ON/OFF state.
Can MAX5033DUSA+T operate with an output voltage below 1.25V?
No. The MAX5033DUSA+T feedback reference voltage is internally trimmed to 1.192V–1.250V (typ 1.221V), and the datasheet specifies a guaranteed output range of 1.25V–13.2V. Attempting to set VOUT below 1.25V violates the reference accuracy specification and results in unregulated output due to insufficient FB node headroom.
What is the maximum allowable output capacitance for stable startup of MAX5033DUSA+T?
The MAX5033DUSA+T has a fixed 400μs internal soft-start time. To avoid >5% output overshoot, the output capacitance must be ≤68μF. Larger values increase rise time beyond tSS, causing the control loop to overcorrect. This constraint applies regardless of ESR or topology - verified in Typical Operating Characteristics Figure toc22/toc23.
Does MAX5033DUSA+T require an external Schottky diode, and what are the key selection criteria?
Yes, MAX5033DUSA+T requires an external Schottky rectifier (e.g., 50SQ100) connected from LX to GND. Key criteria include: reverse voltage rating >76V, forward voltage <0.45V at full load, and continuous current rating ≥500mA. Using a higher-VR diode with elevated VF risks forward-biasing the internal body diode and triggering thermal shutdown.
How does the MAX5033DUSA+T handle thermal overload, and what is the recovery behavior?
When die temperature exceeds +160°C, MAX5033DUSA+T activates thermal shutdown, turning off the high-side switch and halting switching. It remains latched off until junction temperature falls to +140°C (20°C hysteresis), then automatically resumes normal operation - producing a pulsed output under sustained overload rather than permanent latch-off.
MAX5033DUSA+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:
- 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+T FAQ
1.How can I place an order for MAX5033DUSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5033DUSA+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 MAX5033DUSA+T reliable?
The price and inventory of MAX5033DUSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5033DUSA+T is usually 5 days.
3.What payment methods are accepted for MAX5033DUSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5033DUSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5033DUSA+T?
MAX5033DUSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5033DUSA+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 MAX5033DUSA+T?
For technical support, including MAX5033DUSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5033DUSA+T requirements.
6.How does Aetrix verify that MAX5033DUSA+T is sourced from the original manufacturer or authorized distributors?
All MAX5033DUSA+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 MAX5033DUSA+T meets industry standards.
7.What is the process for return or replacement of MAX5033DUSA+T?
All MAX5033DUSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5033DUSA+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 MAX5033DUSA+T part is unused and in its original packaging.
Return procedure for MAX5033DUSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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