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Analog Devices Inc./Maxim Integrated MAX8572EUT+T
- Part No.:
- MAX8572EUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- SOT-23-6
- Datasheet:
-
MAX8572EUT+T.pdf
- Description:
- IC REG CONV LCD 1OUT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:682
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Product details
Overview
The MAX8572EUT+T from Maxim Integrated is a fixed-output 15V, 110mA current-limit LCD step-up DC-DC converter in a 6-pin SOT23 package. It operates from 2.7V to 5.5V input, delivers up to 28V output capability (clamped at 15V), features True Shutdown™ mode with 0.05μA quiescent current, and integrates both n-channel switch and p-channel isolation switch for robust fault protection. It is designed for low-current LCD bias generation in portable electronics.
For engineers reviewing the MAX8572EUT+T datasheet, MAX8572EUT+T pinout, MAX8572EUT+T application, or MAX8572EUT+T equivalent, key selection criteria include its preset 15V output, 110mA current limit, 87% peak efficiency, 6-pin SOT23 footprint, and integrated True Shutdown™ isolation-critical for battery-powered LCD panel power management where output disconnection during standby is mandatory.
Technical Context
The MAX8572EUT+T employs a minimum off-time, current-limited control scheme operating in discontinuous conduction mode. Its internal architecture includes an n-channel MOSFET switch (LX) for inductor current ramp-up and a dedicated p-channel MOSFET (SW) that isolates the output from the input during shutdown-enabling true load disconnect.
This dual-switch topology supports fixed 15V regulation via internal feedback reference (1.226V ±0.012V), achieves up to 800kHz switching frequency for compact external components, and incorporates comprehensive fault protection including open-FB detection, missing-diode response, and output short-circuit recovery with soft-start restart-without external supervision circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15V ±0.187V over -40°C to +85°C - eliminates external resistor divider and ensures stable LCD bias without calibration. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single Li+ battery (3.0–4.2V) or regulated 3.3V/5V rails. |
| Current Limit | 110mA (typical DC limit) - optimized for low-ripple, low-component-count designs in sub-20mA LCD applications. |
| Efficiency | 87% (typical at 5mA load, 3.6V input) - minimizes thermal rise and extends battery life in space-constrained handhelds. |
| Shutdown Current | 0.05μA (typical) - enables multi-week standby in always-on display systems using True Shutdown™ isolation. |
| Switching Frequency | Up to 800kHz - allows use of 22μH–47μH SMT inductors and ceramic capacitors under 10mm² total area. |
| Feedback Reference | 1.226V ±0.012V (over full temperature range) - provides tight output tolerance without trimming or external compensation. |
Pinout & Package
Package: 6-pin SOT23 (U6SN+1), RoHS-compliant, surface-mount, 2.9mm × 1.6mm footprint with 0.95mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Power and signal reference ground | Low-impedance return path for LX, SW, and internal logic; must be connected directly to PCB ground plane. |
| 2 - LX | Inductor switching node | Drain connection of internal n-channel MOSFET; carries pulsed 110mA peak current; requires shortest possible trace to inductor. |
| 3 - SHDN | Logic-controlled shutdown enable | Active-low input; accepts 0V–6V logic levels; pulls internal p-channel switch open to disconnect output from input when low. |
| 4 - OUT | Regulated 15V output | Fixed-voltage output terminal; internally tied to feedback network; requires 1μF ceramic capacitor to GND for stability. |
| 5 - SW | P-channel isolation switch output | Drain of internal p-MOSFET; connects VCC to inductor during operation; left open if True Shutdown™ not required (not recommended). |
| 6 - VCC | Input power supply | 2.7V–5.5V input rail; requires local 1μF ceramic bypass capacitor placed within 2mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ mode | Internally disconnects output from input via p-channel switch, reducing supply current to 0.05μA and eliminating standby power draw from battery. |
| Integrated dual-MOSFET topology | Combines n-channel boost switch (LX) and p-channel isolation switch (SW) - eliminates need for external high-side switch or diode in shutdown path. |
| Robust fault protection | Detects and safely responds to open FB, missing diode, reversed diode, missing output cap, and output short - prevents damage to IC and downstream circuitry. |
| High-efficiency 800kHz operation | Enables use of small 22μH inductors and 0402/0603 ceramic caps - reduces solution size below 25mm² while maintaining >85% efficiency at 5mA. |
| Preset 15V output with tight regulation | 15V ±0.187V over full temperature and line range - meets LCD VPOS/VNEG bias requirements without external resistors or trimming. |
Applications
| Cellular Phone LCD Bias | OLED Display Power |
|---|---|
|
Use Scenario: Generating stable 15V bias for TFT-LCD source drivers in dual-mode GSM/UMTS handsets with Li+ battery input. IC Role / Device Role / Timing Role: Primary step-up regulator providing isolated, low-noise positive bias voltage; activated only during display-on state via SHDN control. Use Value: True Shutdown™ eliminates leakage through display panel during sleep mode, extending standby time by >30% versus non-isolating boost converters. |
Use Scenario: Supplying gate drive voltage for passive-matrix OLED displays in palmtop computers with variable battery voltage (3.0–4.2V). IC Role / Device Role / Timing Role: Fixed-output DC-DC converter delivering regulated 15V to OLED anode driver ICs; synchronized to display refresh timing via SHDN gating. Use Value: 110mA current limit and 87% efficiency maintain <15°C temperature rise on 4-layer FR4 PCB, preventing OLED lifetime degradation from thermal stress. |
| Handheld Terminal Backlight | PDAs with Dual-Voltage LCD |
|
Use Scenario: Powering white LED backlight strings requiring 15V at ≤10mA in ruggedized industrial handheld terminals. IC Role / Device Role / Timing Role: Compact boost converter operating from 3.3V system rail; enabled only during keypad illumination or screen wake events. Use Value: 6-pin SOT23 footprint and integrated SW switch reduce BOM count by 2 components (vs. discrete p-MOSFET + driver) and save 1.2mm² board area. |
Use Scenario: Providing VDD and VEE bias for segmented LCDs in legacy PDAs using single-cell alkaline or NiMH batteries (0.9–1.5V/cell). IC Role / Device Role / Timing Role: Positive 15V generator used with external charge pump (Figure 5) to derive negative bias; operates in burst mode during low-duty-cycle display updates. Use Value: Built-in open-FB and missing-diode protection prevents catastrophic failure when aging electrolytic capacitors degrade in field-deployed units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LCD boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8573EUT+T | Same 6-pin SOT23 package and 15V fixed output, but 250mA current limit and higher 1.5Ω LX on-resistance. | Supports higher-current LCD panels (e.g., larger QVGA displays); less suitable for ultra-low-power standby due to higher no-load current. | Select MAX8573EUT+T only when load exceeds 12mA or ripple sensitivity is lower; MAX8572EUT+T remains optimal for sub-10mA, battery-critical designs. |
| TPS61042DBVR | 15V fixed output, 280mA current limit, 1.2MHz switching, but no integrated p-channel isolation switch - requires external MOSFET for true shutdown. | Lacks native True Shutdown™; output remains coupled to input via inductor/diode during shutdown, drawing ~1μA from battery. | Choose TPS61042DBVR only if higher current or faster switching is mandatory and external isolation can be accommodated; MAX8572EUT+T provides superior integration and lower standby leakage. |
Compared with MAX8573EUT+T and TPS61042DBVR, the MAX8572EUT+T uniquely combines 110mA current capability, 0.05μA shutdown current, and monolithic p-channel isolation in a 6-pin SOT23 - delivering the smallest footprint and lowest standby power for low-current LCD bias where board space and battery life are primary constraints.
Availability
MAX8572EUT+T is available at Aetrix Electronics and suitable for cellular phone LCD bias, OLED display power, handheld terminal backlighting, and PDA dual-voltage LCD applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8572EUT+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–MAX8575 family was designed specifically for compact, low-power LCD and OLED display bias generation in portable electronics - emphasizing integration, fault resilience, and ultra-low shutdown current without external protection components.
FAQ
What is the output voltage tolerance of the MAX8572EUT+T over temperature?
The MAX8572EUT+T delivers a fixed 15V output with ±0.187V tolerance across the full -40°C to +85°C operating range, corresponding to ±1.25% accuracy. This specification is guaranteed by design and verified per the Electrical Characteristics table, ensuring reliable LCD bias without external trimming or calibration in varying environmental conditions.
Can the MAX8572EUT+T be used with a 0.9V alkaline battery input?
No - the MAX8572EUT+T requires a minimum 2.7V input supply and cannot operate directly from a single 0.9V alkaline cell. However, it can be used with a separate inductor supply (as shown in Figure 4), allowing the inductor to be powered from a boosted or stacked battery rail while VCC is supplied from a regulated 3.3V source - enabling compatibility with low-voltage battery chemistries.
Does the MAX8572EUT+T require an external feedback resistor network?
No - the MAX8572EUT+T has an internally trimmed 15V output and does not use the FB pin. Unlike the adjustable MAX8570/MAX8571 variants, it routes the feedback reference internally and exposes only the OUT pin. The FB pin is not connected in this variant, simplifying layout and eliminating resistor selection errors.
What happens to the output during shutdown of the MAX8572EUT+T?
During shutdown (SHDN = low), the MAX8572EUT+T activates its internal p-channel isolation switch, disconnecting the output from the input path. The OUT pin is pulled to GND through a 7.5MΩ internal resistor, causing VOUT to decay exponentially based on external load and capacitance - ensuring zero steady-state current draw from the battery.
Is the MAX8572EUT+T pin-compatible with other members of the MAX8570 family?
Yes - all MAX8570–MAX8575 variants in the 6-pin SOT23 package (including MAX8572EUT+T, MAX8573EUT+T, and MAX8574EUT+T) share identical pinout and footprint (U6SN+1). However, functional differences exist: MAX8572EUT+T uses OUT instead of FB and has different current-limit and regulation behavior - direct substitution requires validation of load current and shutdown requirements.
MAX8572EUT+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:
- 15V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX8572EUT+T FAQ
1.How can I place an order for MAX8572EUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8572EUT+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 MAX8572EUT+T reliable?
The price and inventory of MAX8572EUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8572EUT+T is usually 5 days.
3.What payment methods are accepted for MAX8572EUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8572EUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8572EUT+T?
MAX8572EUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8572EUT+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 MAX8572EUT+T?
For technical support, including MAX8572EUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8572EUT+T requirements.
6.How does Aetrix verify that MAX8572EUT+T is sourced from the original manufacturer or authorized distributors?
All MAX8572EUT+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 MAX8572EUT+T meets industry standards.
7.What is the process for return or replacement of MAX8572EUT+T?
All MAX8572EUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8572EUT+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 MAX8572EUT+T part is unused and in its original packaging.
Return procedure for MAX8572EUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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