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Analog Devices Inc./Maxim Integrated MAX8570ELT+G47
- Part No.:
- MAX8570ELT+G47
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- -
- Datasheet:
-
MAX8570ELT+G47.pdf
- Description:
- IC INTEGRATED CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:1,987
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Product details
Overview
The MAX8570ELT+G47 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 110mA current limit, 800kHz max switching frequency, and True Shutdown™ mode. It is used in compact LCD bias generation for handheld devices requiring low quiescent current and fault-protected operation.
For engineers reviewing the MAX8570ELT+G47 datasheet, MAX8570ELT+G47 pinout, MAX8570ELT+G47 application, or MAX8570ELT+G47 equivalent, key selection criteria include its µDFN-6 package, adjustable 3V–28V output via FB resistor divider, 25µA typical supply current, integrated safety features against open-feedback and missing-capacitor faults, and compatibility with small 22µH–47µH inductors.
Technical Context
The MAX8570ELT+G47 employs a minimum off-time, current-limited control scheme operating in discontinuous conduction mode. Its internal n-channel MOSFET (101mΩ typical on-resistance at 50mA) and p-channel isolation switch enable true shutdown-fully disconnecting the output from input during sleep, reducing supply current to 0.05µA.
Feedback regulation uses a precision 1.226V reference (±0.25% over temperature), with FB pin bias current under ±50nA. The device supports feed-forward compensation (C4 = 10–47pF) for stability across wide input voltage ranges and includes built-in protection against open FB, missing output capacitor, reversed diode, and output short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - compatible with single Li+ battery or regulated 3.3V/5V rails |
| Output Voltage Range | Adjustable from VCC to 28V - set via external resistor divider on FB pin |
| Current Limit | 110mA - optimized for low-ripple, low-power LCD bias (e.g., <5mA load) |
| Switching Frequency | Up to 800kHz - enables use of tiny 22µH–47µH surface-mount inductors |
| Supply Current | 25µA typical - minimizes standby power in always-on portable systems |
| Shutdown Current | 0.05µA typical - ensures negligible battery drain during system sleep |
| FB Reference Voltage | 1.226V ±0.25% - enables accurate output setting with standard 1% resistors |
Pinout & Package
MAX8570ELT+G47 is housed in a RoHS-compliant, lead(Pb)-free 6-pin µDFN package (2mm × 2mm, 0.5mm pitch, 0.8mm height), thermally enhanced with exposed pad for improved power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Power and signal reference ground | Low-impedance return path; must be connected to PCB ground plane under exposed pad |
| 2 - LX | Inductor switching node | Drives external inductor; connects to source of internal n-MOSFET; requires short, low-inductance trace |
| 3 - FB | Feedback input | Senses output voltage via resistor divider; regulates output to 1.226V × (1 + R1/R2) |
| 4 - SHDN | Logic-controlled shutdown enable | Active-low input; drives low to enter 0.05µA shutdown; tolerates up to 6V regardless of VCC |
| 5 - SW | P-channel isolation switch output | Connects VCC to inductor during operation; disconnects input during shutdown for True Shutdown™ |
| 6 - VCC | Power supply input | Accepts 2.7V–5.5V; bypass with 1µF ceramic capacitor placed near pin |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | Internal p-MOSFET disconnects input from inductor during shutdown, eliminating standby current draw from battery |
| Integrated Safety Protection | Detects and safely halts switching during open FB, missing output cap, reversed diode, or output short-protecting both IC and downstream circuitry |
| Feed-Forward Compensation Support | FB-to-VOUT capacitor (10–47pF) improves loop stability across full battery voltage range (2.7V–5.5V) |
| Low Quiescent Current | 25µA typical operating current extends battery life in always-on display subsystems |
| High-Efficiency Operation | 87% peak efficiency at 5mA load enables thermal-constrained designs without heatsinking |
Applications
| Small LCD Bias Generation | OLED Panel Power Supply |
|---|---|
Use Scenario: Providing positive bias voltage (e.g., +18V) for TFT-LCD gate drivers in palmtop computers and PDAs powered by single Li+ cells. IC Role / Device Role / Timing Role: Step-up DC-DC converter with adjustable output and integrated isolation switch for clean power sequencing. Use Value: Enables compact, low-noise LCD bias using only one 22µH inductor and two 1% resistors-no external MOSFET or diode required. | Use Scenario: Generating stable 15–25V anode supply for polymer OLED displays in cordless phones and handy terminals. IC Role / Device Role / Timing Role: Adjustable boost regulator with precise 1.226V feedback reference and soft-start to prevent inrush-induced display flicker. Use Value: Delivers 20mA at 20V from 3.6V input with <0.1%/V line regulation-ensuring consistent brightness across battery discharge. |
| Negative LCD Bias Generation | Low-Power Handheld System Power |
Use Scenario: Creating negative bias (e.g., –17V) for LCD common electrode using charge-pump topology with external diode/capacitor (Figure 5). IC Role / Device Role / Timing Role: Positive-output boost controller repurposed as charge-pump driver via SW and LX nodes. Use Value: Eliminates need for separate negative generator IC; negative output tracks positive output minus one diode drop, simplifying BOM. | Use Scenario: Powering auxiliary analog circuitry (e.g., touch controller, backlight dimming logic) in battery-operated organizers with strict <100µA sleep budget. IC Role / Device Role / Timing Role: Always-on bias rail generator with 0.05µA shutdown current and fast wake-up (<1ms). Use Value: Reduces total system standby power by >95% compared to non-True Shutdown alternatives-extending shelf life and runtime. |
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 µDFN/SOT23 packages, identical pinout and FB architecture | Supports higher output current (e.g., 10mA+ LCD panels); slightly higher ripple due to increased ILIM | Select when load exceeds 5mA or when higher peak power is needed without changing layout |
| TPS61040DBVR | Fixed 28V output option, 28V absolute max VOUT, no True Shutdown, 500mA ILIM, SOT23-5 package (different pin count) | Lacks output isolation switch; output remains coupled to input during shutdown; requires external diode | Choose only if fixed 28V output suffices and True Shutdown is not required-requires PCB redesign |
Compared with MAX8571EUT+T, the MAX8570ELT+G47 offers lower current limit and reduced ripple for ultra-low-power LCDs; compared with TPS61040DBVR, it provides true input-output isolation and superior fault resilience but requires resistor-based output programming.
Availability
MAX8570ELT+G47 is available at Aetrix Electronics and suitable for LCD bias generation, OLED panel power, and handheld device auxiliary supply applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8570ELT+G47 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 space-constrained, battery-powered LCD and OLED display biasing-emphasizing ultra-low quiescent current, integrated safety, and minimal external component count.
FAQ
What is the maximum output voltage supported by the MAX8570ELT+G47?
The MAX8570ELT+G47 supports an adjustable output voltage ranging from VCC up to 28V, set via an external resistor divider connected to the FB pin. Its internal 1.226V reference and precision feedback architecture ensure stable regulation across this full range, with typical output accuracy of ±0.25% over temperature. This makes the MAX8570ELT+G47 suitable for demanding LCD gate-driver and OLED anode applications requiring tightly controlled high-voltage rails.
Does the MAX8570ELT+G47 require an external diode in its typical application circuit?
No, the MAX8570ELT+G47 does not require an external diode in its standard boost configuration because it integrates a p-channel MOSFET isolation switch (SW pin) and relies on inductor flyback through the internal n-channel switch. However, an external Schottky diode is required only when implementing negative output voltage generation (Figure 5) or when using a separate inductor supply (Figure 4). In those cases, the diode must have reverse breakdown > VOUT and average current rating > peak LX current.
What package type is used for the MAX8570ELT+G47, and what are its thermal characteristics?
The MAX8570ELT+G47 uses a 6-pin µDFN package (2mm × 2mm, 0.5mm pitch) with exposed thermal pad. Its continuous power dissipation at +70°C is 357.8mW, derating by 4.5mW/°C above that temperature. The package supports reflow soldering at +260°C and is RoHS-compliant and lead(Pb)-free. Thermal performance is enhanced by soldering the exposed pad directly to a large PCB copper area, enabling reliable operation in compact handheld enclosures without forced airflow.
How does the True Shutdown™ feature of the MAX8570ELT+G47 improve system power efficiency?
The True Shutdown™ feature in the MAX8570ELT+G47 uses an internal p-channel MOSFET to fully disconnect the input supply from the inductor during shutdown, reducing supply current to just 0.05µA typical. Unlike conventional boost converters where the output remains coupled to input via the inductor and diode-causing leakage and residual load-the MAX8570ELT+G47 eliminates all current paths from battery to load. This extends battery shelf life and enables true zero-power sleep modes in portable electronics.
Can the MAX8570ELT+G47 be used to generate a negative output voltage?
Yes, the MAX8570ELT+G47 can generate a negative output voltage using the charge-pump configuration shown in Figure 5 of its datasheet. In this setup, the positive output powers a diode-capacitor network to produce a negative rail (e.g., –17V) referenced to ground. The negative output magnitude is approximately equal to the positive output minus one forward diode drop. To stabilize the negative rail under light loads, a small preload (few hundred µA) on the positive output is recommended-achievable by lowering R1/R2 values in the feedback divider.
MAX8570ELT+G47 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- -
- Voltage - Input:
- -
- Number of Outputs:
- -
- Voltage - Output:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX8570ELT+G47 FAQ
1.How can I place an order for MAX8570ELT+G47 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8570ELT+G47 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 MAX8570ELT+G47 reliable?
The price and inventory of MAX8570ELT+G47 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8570ELT+G47 is usually 5 days.
3.What payment methods are accepted for MAX8570ELT+G47?
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4.How is shipping managed for MAX8570ELT+G47?
MAX8570ELT+G47 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8570ELT+G47 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 MAX8570ELT+G47?
For technical support, including MAX8570ELT+G47 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8570ELT+G47 requirements.
6.How does Aetrix verify that MAX8570ELT+G47 is sourced from the original manufacturer or authorized distributors?
All MAX8570ELT+G47 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 MAX8570ELT+G47 meets industry standards.
7.What is the process for return or replacement of MAX8570ELT+G47?
All MAX8570ELT+G47 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8570ELT+G47, 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 MAX8570ELT+G47 part is unused and in its original packaging.
Return procedure for MAX8570ELT+G47:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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