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Analog Devices Inc./Maxim Integrated MAX8574EUT+T
- Part No.:
- MAX8574EUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- SOT-23-6
- Datasheet:
-
MAX8574EUT+T.pdf
- Description:
- IC REG CONV LCD 1OUT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,248
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Product details
Overview
The MAX8574EUT+T from Maxim Integrated is a high-efficiency, adjustable-output LCD step-up DC-DC converter with internal n-channel switch and p-channel output isolation switch. It operates from 2.7V to 5.5V input, delivers up to 28V output, features 500mA current limit, 800kHz max switching frequency, and True Shutdown™ mode. It is used in compact LCD bias generation for portable devices requiring stable high-voltage rail from single Li+ cells.
For engineers reviewing the MAX8574EUT+T datasheet, MAX8574EUT+T pinout, MAX8574EUT+T application, or MAX8574EUT+T equivalent, key selection criteria include adjustable 3V–28V output range, 500mA peak LX current capability, SOT23-6 package compatibility, and integrated fault protection for open-feedback or missing-output-capacitor conditions.
Technical Context
The MAX8574EUT+T uses a minimum off-time, current-limited control scheme operating in discontinuous conduction mode. Its internal architecture integrates an n-channel main switch (LX) and a p-channel isolation switch (SW), enabling true shutdown by disconnecting the output from the input during sleep.
Output voltage is set via external resistor divider on FB pin (1.226V reference), supporting precise adjustment from VCC to 28V. Protection logic monitors FB, OUT, diode, and inductor connections-halting switching and resistively loading OUT to GND under open/short faults to safeguard downstream circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li+ and regulated 3.3V/5V rails without external LDO. |
| Output Voltage Range | Adjustable 3V to 28V - set via FB resistor divider; enables flexible bias for diverse LCD panels. |
| LX Current Limit | 425mA to 540mA (typ 484mA) - supports ≥20mA at 20V output from low-input sources. |
| Switching Frequency | Up to 800kHz - allows use of small 10μH–100μH inductors and ceramic capacitors. |
| Quiescent Current | 25μA (typ) - minimizes battery drain in always-on display subsystems. |
| Shutdown Current | 0.05μA (typ) - enables ultra-low-power sleep states in portable electronics. |
| FB Reference Voltage | 1.2137V to 1.2383V - ensures ±1% output regulation accuracy over temperature. |
| Efficiency | 87% (typ) - measured at 5mA load, 3.6V input, 18V output with 22μH inductor. |
Pinout & Package
Package: 6-pin SOT23 (RoHS-compliant, tape-and-reel). Compact footprint (2.9mm × 1.6mm) suitable for space-constrained handheld PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Primary return path for IC core, LX switch, and feedback network; must be low-impedance connection to system ground plane. |
| LX | Inductor switching node | Drain of internal n-channel MOSFET; connects directly to inductor; carries pulsed high-current switching waveform. |
| VCC | Power supply input | 2.7V–5.5V input rail; bypassed with 1μF ceramic capacitor to suppress high-frequency noise. |
| SHDN | Logic-controlled enable | Active-low shutdown input; accepts 0V–6V logic levels; pulls OUT to GND via 7.5MΩ resistor when asserted. |
| SW | Isolation switch output | Drain of internal p-channel MOSFET; isolates input from inductor during shutdown; requires 4.7μF ceramic capacitor to GND. |
| FB | Feedback input | Monitors output voltage via resistor divider; 1.226V internal reference sets output as VOUT = 1.226V × (1 + R1/R2). |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | Internal p-channel switch disconnects output from input during shutdown, reducing supply current to 0.05μA and eliminating standby power draw. |
| Integrated Fault Protection | Halts switching and resistively loads OUT to GND if FB open, OUT shorted, diode missing/reversed, or output capacitor absent-protecting both IC and downstream components. |
| Adjustable Output (3V–28V) | Configurable via two external resistors; supports wide range of LCD panel bias requirements without redesigning power stage. |
| High Switching Frequency (≤800kHz) | Enables use of miniature surface-mount inductors (e.g., 22μH) and low-ESR ceramic capacitors, minimizing solution size and cost. |
| 500mA Peak LX Current Limit | Delivers ≥20mA at 20V from 3.6V input-sufficient for driving multiple segment lines or active-matrix OLED bias rails. |
Applications
| Portable LCD Bias Generation | OLED Panel Power Supply |
|---|---|
Use Scenario: Generating positive bias voltage (e.g., +18V) for TFT-LCD source drivers in smartphones and PDAs powered by single Li+ cells. IC Role / Device Role / Timing Role: Step-up DC-DC converter providing regulated high-voltage rail; controls output via FB resistor divider and manages inductor current with current-mode control. Use Value: Enables compact, efficient LCD bias with no external MOSFET or diode-reducing BOM count and PCB area while maintaining <±1% output regulation. | Use Scenario: Supplying gate drive voltage (e.g., +20V) for PMOLED or AMOLED display backplanes in wearables and handheld terminals. IC Role / Device Role / Timing Role: Adjustable boost regulator delivering stable high-side voltage; leverages 500mA current limit to sustain 20mA load at 20V under varying battery voltage. Use Value: Maintains consistent OLED brightness across battery discharge cycle (2.7V–4.2V) with 87% efficiency and minimal thermal rise in SOT23 package. |
| Cellular Phone Display Power | Handheld Terminal LCD Backlight Support |
Use Scenario: Providing programmable VGH voltage for LCD modules in dual-mode cellular/cordless phones with tight power budget. IC Role / Device Role / Timing Role: Configurable boost converter with True Shutdown; enters 0.05μA sleep state when display is off, eliminating leakage through backlight path. Use Value: Extends standby time by >3× versus non-shutdown boosters; supports rapid wake-up (<1ms soft-start) for responsive UI transitions. | Use Scenario: Delivering adjustable bias (e.g., +15V to +25V) for monochrome or color STN/FSTN LCDs in ruggedized industrial handhelds. IC Role / Device Role / Timing Role: High-reliability boost controller with built-in open-FB and missing-capacitor protection-prevents catastrophic overvoltage during field maintenance or component failure. Use Value: Eliminates need for external supervision circuitry; sustains operation even with degraded feedback network or partial PCB damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LCD boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8571EUT+T | 250mA current limit, same 6-pin SOT23 package, identical pinout and FB interface. | Lower output current capability (≤10mA at 20V); suited for smaller monochrome LCDs or low-power segments. | Select when load current ≤12mA and board space or cost constraints favor reuse of existing layout. |
| TPS61042DBVR | Fixed 28V output, 400mA current limit, 5-pin SOT23, no SW pin or True Shutdown isolation switch. | Lacks adjustable output and output disconnection in shutdown; requires external diode and higher quiescent current (65μA). | Choose only if fixed 28V output suffices and system-level isolation is handled externally or not required. |
Compared with MAX8571EUT+T, the MAX8574EUT+T provides double the current limit for driving larger LCD panels or multiple bias rails, while retaining identical footprint and control interface. Versus TPS61042DBVR, it offers design flexibility via adjustable output, lower shutdown current, and integrated isolation-reducing external component count and improving system-level reliability.
Availability
The MAX8574EUT+T is available at Aetrix Electronics and suitable for portable display power, OLED bias generation, and handheld terminal LCD applications requiring stable component supply and long-term manufacturability.
Supply support for MAX8574EUT+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 demanding industrial, automotive, and consumer applications.
The MAX8570 family-including the MAX8574EUT+T-is engineered specifically for compact, high-reliability LCD and OLED display bias generation in battery-powered portable electronics.
FAQ
What output voltage range does the MAX8574EUT+T support?
The MAX8574EUT+T supports an adjustable output voltage from 3V up to 28V, set using an external resistor divider connected to the FB pin with a 1.226V internal reference. This range is confirmed in the datasheet's Selector Guide and Typical Operating Characteristics (Figure MAX8570/71/73/74/75 toc03), where output remains stable across 3.1V–4.9V input at 20mA load. The MAX8574EUT+T does not support fixed-output variants like the MAX8575EUT+T.
Does the MAX8574EUT+T include built-in protection against open feedback or missing output capacitor?
Yes, the MAX8574EUT+T includes robust fault protection: if the FB resistor divider opens or the output capacitor is missing, the device halts switching and resistively loads the OUT node to GND via internal circuitry-preventing destructive overvoltage. This behavior is documented in Table 1 ("Protection Features") and verified in the "COMMON APPLICATION FAULTS" section of the datasheet, confirming protection applies specifically to the MAX8574EUT+T as part of the MAX8570 family.
What is the maximum load current the MAX8574EUT+T can deliver at 20V output?
The MAX8574EUT+T can deliver up to 20mA at 20V output from a single Li+ cell (3.6V typical), enabled by its 500mA peak LX current limit and high 87% efficiency. This capability is explicitly stated in the General Description and confirmed in the Selector Guide (MAX8574/MAX8575: "500mA current limit… supply up to 20mA at 20V"). Performance is validated across temperature (–40°C to +85°C) per Electrical Characteristics tables.
How does the True Shutdown™ feature of the MAX8574EUT+T reduce system power consumption?
The True Shutdown™ feature in the MAX8574EUT+T reduces system power consumption by using an internal p-channel MOSFET to disconnect the output from the input during shutdown, dropping supply current to just 0.05μA (typ). Unlike conventional boosters that leak through the inductor/diode path, this isolation eliminates standby current draw-critical for battery life in portable displays. This function is confirmed in the General Description, Shutdown section, and Absolute Maximum Ratings.
What package type and pin count does the MAX8574EUT+T use?
The MAX8574EUT+T uses a 6-pin SOT23 package (orderable part code U6SN+1), with top mark ABTN. This is confirmed in the Ordering Information table and Pin Configurations diagram, which show identical pinout (GND, LX, VCC, SHDN, SW, FB) across all SOT23 variants (MAX8570–MAX8575 EUT+T). It is not offered in μDFN; that package applies only to MAX8570ELT+T.
MAX8574EUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Converter, LCD
- Voltage - Input:
- 2.7V ~ 5.5V
- Number of Outputs:
- 1
- Voltage - Output:
- 2.7V ~ 28V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX8574EUT+T FAQ
1.How can I place an order for MAX8574EUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8574EUT+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 MAX8574EUT+T reliable?
The price and inventory of MAX8574EUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8574EUT+T is usually 5 days.
3.What payment methods are accepted for MAX8574EUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8574EUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8574EUT+T?
MAX8574EUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8574EUT+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 MAX8574EUT+T?
For technical support, including MAX8574EUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8574EUT+T requirements.
6.How does Aetrix verify that MAX8574EUT+T is sourced from the original manufacturer or authorized distributors?
All MAX8574EUT+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 MAX8574EUT+T meets industry standards.
7.What is the process for return or replacement of MAX8574EUT+T?
All MAX8574EUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8574EUT+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 MAX8574EUT+T part is unused and in its original packaging.
Return procedure for MAX8574EUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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