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Analog Devices Inc./Maxim Integrated MAX8571EUT+T
- Part No.:
- MAX8571EUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- SOT-23-6
- Datasheet:
-
MAX8571EUT+T.pdf
- Description:
- IC REG CONV LCD 1OUT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,998
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Product details
Overview
The MAX8571EUT+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 250mA current limit, 87% typical efficiency, and True Shutdown™ mode. It is used in compact LCD bias generation for portable displays powered by single Li+ batteries.
For engineers reviewing the MAX8571EUT+T datasheet, MAX8571EUT+T pinout, MAX8571EUT+T application, or MAX8571EUT+T equivalent, key selection criteria include adjustable 3V–28V output voltage range, SOT23-6 package compatibility, 250mA peak LX current limit, integrated safety protections against open-feedback and missing-output-capacitor faults, and support for negative-bias generation via charge-pump configuration.
Technical Context
The MAX8571EUT+T employs a minimum off-time, current-limited control scheme operating in discontinuous conduction mode. Its internal architecture integrates an n-channel MOSFET switch (LX) and a p-channel isolation switch (SW), enabling true shutdown by disconnecting the output from the input path during standby.
Output voltage is set via external resistor divider on FB pin with 1.226V regulation reference; feedback bias current must exceed 2µA for accuracy. The device supports feed-forward compensation (C4 = 10pF) to stabilize regulation across wide input voltage ranges and enables negative output generation using external diode/capacitor charge pump (Figure 5).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li+ battery systems including discharged states down to 2.7V. |
| Output Voltage Range | Adjustable from VCC to 28V - configured via FB resistor divider; supports both positive and negative LCD bias rails. |
| LX Current Limit | 250mA (typ) - balances low ripple (vs. 110mA variants) and higher power capability (vs. 500mA variants) for mid-range LCD panels. |
| Switching Frequency | Up to 800kHz - enables use of small 22μH–47μH surface-mount inductors and minimizes solution footprint. |
| Efficiency | 87% (typ at 5mA load, VCC=3.6V, VOUT=18V) - reduces thermal stress and extends battery life in portable applications. |
| Shutdown Current | 0.05μA (typ) - achieved via True Shutdown™, eliminating leakage through inductor/diode path during sleep mode. |
| FB Regulation Voltage | 1.226V (typ, ±10mV over -40°C to +85°C) - determines output accuracy; sets resolution for precise bias voltage tuning. |
Pinout & Package
MAX8571EUT+T is housed in a RoHS-compliant, lead-free 6-pin SOT23 package (top mark ABTK), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal pad omitted - suitable for space-constrained handheld PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Power ground reference | Low-impedance return path for LX, SW, and internal logic; must be connected to main system ground plane. |
| 2 - LX | Inductor switching node | Drain of internal n-channel MOSFET; connects directly to inductor; carries pulsed 250mA peak current. |
| 3 - SHDN | Logic-controlled enable/disable input | Active-low digital input; drives <0.7V for shutdown; tolerates up to 6V regardless of VCC; no pull-up required. |
| 4 - VCC | Main supply input | 2.7V–5.5V input rail; requires local 1μF ceramic bypass capacitor to GND for stability and noise suppression. |
| 5 - SW | Isolation switch output | Drain of internal p-channel MOSFET; connects to inductor supply when True Shutdown is enabled; requires 4.7μF ceramic to GND. |
| 6 - FB | Feedback voltage sensing input | Monitors resistor-divider output; regulates VOUT to 1.226V × (1 + R1/R2); bias current ≤50nA ensures minimal divider loading. |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ mode | Internally disconnects output from input via p-channel SW switch, reducing quiescent current to 0.05μA and preventing battery drain during standby. |
| Integrated fault protection | Detects and safely shuts down on open FB, missing output capacitor, reversed diode, or shorted OUT - protects both IC and downstream display circuitry. |
| Adjustable output (3V–28V) | Configured via two external resistors; 1.226V FB reference enables accurate bias setting for diverse LCD panel requirements. |
| High-frequency operation (≤800kHz) | Enables use of miniature 22μH inductors and low-ESR ceramic capacitors, minimizing total BOM size and cost. |
| Negative output support | Enabled via external diode/capacitor charge-pump (Figure 5); generates complementary negative bias without additional controller IC. |
Applications
| Small LCD Bias Generation | OLED Display Power |
|---|---|
|
Use Scenario: Generating stable positive bias (e.g., +18V) for TFT-LCD source drivers in palmtop computers and PDAs. IC Role / Device Role / Timing Role: Primary step-up converter regulating output voltage via FB feedback loop; provides isolated, low-noise DC bias under dynamic load conditions. Use Value: 250mA current limit and 87% efficiency ensure sufficient headroom for 5–10mA panel loads while maintaining thermal safety in sealed enclosures. |
Use Scenario: Supplying programmable gate bias (e.g., +15V to +22V) for polymer OLED pixel driver circuits in handheld terminals. IC Role / Device Role / Timing Role: Adjustable boost regulator delivering precise, ripple-sensitive voltage to OLED anode lines; supports fast startup and line transient rejection. Use Value: Feed-forward capacitor (C4 = 10pF) stabilizes regulation across 2.7V–5.5V battery discharge, ensuring consistent brightness over full battery life. |
| Cellular Phone Main Display | Industrial Handheld Organizers |
|
Use Scenario: Providing dual-rail bias (positive +18V and negative –15V) for active-matrix LCDs in 3G/4G feature phones with limited board area. IC Role / Device Role / Timing Role: Single-IC solution generating both polarities: positive rail via standard boost, negative rail via Figure 5 charge-pump topology. Use Value: Eliminates need for second converter or transformer-based solution; SOT23-6 footprint fits within tight RF module keep-out zones. |
Use Scenario: Delivering regulated +20V bias to segmented LCD modules in ruggedized industrial organizers operating across -40°C to +85°C. IC Role / Device Role / Timing Role: High-reliability boost converter with built-in open-FB and missing-capacitor fault detection to prevent field failures in unattended deployments. Use Value: Guaranteed operation over full industrial temperature range; 1.226V FB reference drift <±25mV ensures stable contrast control despite ambient thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LCD boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8570EUT+T | 110mA current limit; identical adjustable output range and pinout. | Better suited for ultra-low-power, low-ripple applications (e.g., monochrome LCDs drawing <2mA). | Select MAX8570EUT+T when lower EMI and smaller inductor size are prioritized over output current capability. |
| MAX8574EUT+T | 500mA current limit; same FB-adjustable architecture and SOT23-6 package. | Required for high-current LCDs (e.g., color TFTs needing >15mA at 20V) or multi-panel bias distribution. | Choose MAX8574EUT+T when driving larger displays or parallel bias rails where 250mA headroom is insufficient. |
Compared with MAX8570EUT+T and MAX8574EUT+T, the MAX8571EUT+T offers optimal trade-off between ripple performance and power delivery for mid-tier LCD panels - avoiding unnecessary component derating while retaining margin for transient loads and temperature drift.
Availability
MAX8571EUT+T is available at Aetrix Electronics and suitable for LCD bias generators, OLED display power supplies, and portable communication device designs requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX8571EUT+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX8570 family was designed specifically for compact, battery-powered LCD and OLED display biasing - emphasizing ultra-low quiescent current, robust fault tolerance, and minimal external component count in space-constrained portable devices.
FAQ
What output voltage range does the MAX8571EUT+T support?
The MAX8571EUT+T supports an adjustable output voltage from VCC up to 28V, set via an external resistor divider on the FB pin using the 1.226V internal reference. This allows precise configuration for LCD panel requirements such as +15V, +18V, or +20V bias rails without changing the IC.
How does True Shutdown™ work in the MAX8571EUT+T?
True Shutdown™ in the MAX8571EUT+T uses an internal p-channel MOSFET (SW pin) to physically disconnect the output from the input supply when SHDN is pulled low. This reduces supply current to 0.05μA and prevents battery drain through the inductor and diode path - unlike conventional boost converters that retain leakage paths.
Can the MAX8571EUT+T generate negative output voltages?
Yes, the MAX8571EUT+T can generate negative output voltages using the external diode/capacitor charge-pump configuration shown in Figure 5 of the datasheet. In this setup, the negative rail magnitude is approximately equal to the positive output minus one diode forward drop, enabling dual-rail LCD bias from a single IC.
What is the recommended inductor value for the MAX8571EUT+T?
The recommended inductor value for the MAX8571EUT+T is 22μH (e.g., Murata LQH32CN220K23) for general-purpose applications, or 47μH (e.g., Toko A914BYW-470M) for higher output power and lower ripple. Inductor saturation current must exceed 250mA, and DCR should be minimized to preserve efficiency.
Does the MAX8571EUT+T require a feed-forward capacitor?
Yes, a feed-forward capacitor (C4 = 10pF) is recommended between FB and VOUT for the MAX8571EUT+T to improve loop stability across the full 2.7V–5.5V input range. Omitting C4 may cause regulation error or oscillation during battery voltage transients, especially at light loads.
MAX8571EUT+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
MAX8571EUT+T FAQ
1.How can I place an order for MAX8571EUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8571EUT+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 MAX8571EUT+T reliable?
The price and inventory of MAX8571EUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8571EUT+T is usually 5 days.
3.What payment methods are accepted for MAX8571EUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8571EUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8571EUT+T?
MAX8571EUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8571EUT+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 MAX8571EUT+T?
For technical support, including MAX8571EUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8571EUT+T requirements.
6.How does Aetrix verify that MAX8571EUT+T is sourced from the original manufacturer or authorized distributors?
All MAX8571EUT+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 MAX8571EUT+T meets industry standards.
7.What is the process for return or replacement of MAX8571EUT+T?
All MAX8571EUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8571EUT+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 MAX8571EUT+T part is unused and in its original packaging.
Return procedure for MAX8571EUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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