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Analog Devices Inc./Maxim Integrated MAX8640ZEXT25+T
- Part No.:
- MAX8640ZEXT25+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
MAX8640ZEXT25+T.pdf
- Description:
- IC REG BUCK 2.5V 500MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,522
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Product details
Overview
MAX8640ZEXT25+T from Maxim Integrated is a synchronous step-down DC-DC converter optimized for space-constrained portable applications. It delivers up to 500mA output current at a factory-preset 2.5V, operates with 4MHz switching frequency, uses only a 1µH inductor and 2.2µF output capacitor, and achieves 28µA quiescent current. It serves as core or I/O power supply in handheld devices requiring ultra-small footprint and low ripple.
For engineers reviewing the MAX8640ZEXT25+T datasheet, MAX8640ZEXT25+T pinout, MAX8640ZEXT25+T application, or MAX8640ZEXT25+T equivalent, key selection criteria include its 4MHz fixed-frequency operation, SC70-6 package (2.0mm × 2.1mm), ±1% output voltage accuracy, ultrasonic skip mode down to 1mA, and voltage-positioning load regulation enabled by LX-sensed feedback.
Technical Context
The MAX8640ZEXT25+T employs a proprietary hysteretic PWM control scheme that enables fixed 4MHz switching-distinct from the 2MHz MAX8640Y variants-to minimize external component size while maintaining stability across load transients. Its voltage-positioning architecture samples feedback directly from the LX node, eliminating phase lag from output capacitance and enabling use of tiny ceramic capacitors without compensation.
This IC integrates both high-side p-channel and low-side n-channel MOSFETs with on-resistances of 0.6Ω (pFET) and 0.35Ω (nFET), supports shutdown current as low as 0.01µA, and features fast soft-start to suppress inrush current. The internal synchronous rectification replaces external Schottky diodes and improves efficiency across the full 0–500mA load range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-preset 2.5V with ±1% initial accuracy - eliminates external resistor divider and ensures tight regulation without calibration. |
| Switching Frequency | Fixed 4MHz - enables use of 1µH inductor and 2.2µF output capacitor, reducing solution footprint by >40% vs. 2MHz alternatives. |
| Max Output Current | 500mA guaranteed - supports microprocessor I/O rails and DSP peripherals in battery-powered handhelds. |
| Quiescent Current | 28µA typical - extends battery life in always-on or low-duty-cycle modes without sacrificing transient response. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li+ (3.0–4.2V), alkaline (up to 5.5V), and regulated 3.3V/5V system rails. |
| Shutdown Current | 0.01µA typical - reduces system standby power to negligible levels during deep sleep states. |
| Load Regulation | Voltage-positioning type - output droop equals inductor DCR × load current, minimizing overshoot during 10mA–500mA transients. |
Pinout & Package
MAX8640ZEXT25+T is housed in a lead-free, RoHS-compliant 6-pin SC70 package (2.0mm × 2.1mm). This ultra-compact surface-mount package supports high-density PCB layouts and reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | LX | Switch node connecting internal pFET drain and nFET source - requires short, low-inductance trace to inductor; high-impedance during shutdown. |
| 2, 5 | GND | Power ground - both pins must be connected together directly under the IC and tied to input/output capacitor grounds to minimize noise coupling. |
| 3 | OUT | Output voltage sense input - internally connected to feedback network; bypass with ceramic capacitor placed adjacent to pin 3 and pin 2. |
| 4 | SHDN | Active-low enable input - logic-high enables regulation; requires ≥10µs low pulse after VIN exceeds UVLO (2.6V) to reset internal logic. |
| 6 | IN | Main power input (2.7–5.5V) - bypass with ceramic capacitor placed adjacent to pin 6 and pin 5 to suppress switching noise and supply current spikes. |
Key Features
| Feature | Design Value |
|---|---|
| 4MHz fixed-frequency operation | Enables 1µH inductor + 2.2µF output capacitor solution - reduces total BOM area by ~35% versus 2MHz equivalents. |
| Voltage-positioning feedback | LX-sensed regulation removes output capacitor phase lag - allows stable loop with <10µF ceramic caps and halves peak-to-peak load-transient excursion. |
| Ultrasonic pulse-skipping mode | Maintains switching above 20kHz down to 1mA loads - eliminates audible noise while preserving 28µA quiescent current. |
| Internal synchronous rectification | Replaces external Schottky diode - improves light-load efficiency by up to 15% and eliminates reverse recovery losses. |
| Fast soft-start | Controls ramp rate of output voltage - limits inrush current to <50mA, relaxing input capacitor and source impedance requirements. |
Applications
| Smartphone Application Processor Core Rail | Digital Camera Sensor I/O Power |
|---|---|
Use Scenario: Powers ARM Cortex-A series CPU cores requiring tightly regulated 2.5V at up to 400mA with rapid load steps during burst processing. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 2.5V with voltage-positioning load regulation and 4MHz switching for minimal output capacitance. Use Value: Reduces output capacitor count to one 2.2µF X5R ceramic, cuts PCB area by 2.1mm² vs. 2MHz solutions, and maintains <15mV peak-to-peak ripple during 100mA→400mA transients. |
Use Scenario: Supplies image sensor interface circuitry in compact digital still cameras where board space is constrained and EMI must be minimized. IC Role / Device Role / Timing Role: Low-noise, high-efficiency I/O rail generator with ultrasonic skip mode to avoid interference with analog pixel readout timing. Use Value: 4MHz operation shifts switching harmonics beyond sensitive analog bands; 28µA quiescent current extends standby time between shots without compromising startup speed. |
| Bluetooth Headset Audio Codec Supply | Wearable Fitness Tracker MCU Rail |
Use Scenario: Provides clean 2.5V bias to stereo audio codec in battery-powered Bluetooth headsets with strict acoustic noise and runtime requirements. IC Role / Device Role / Timing Role: Ultra-low-noise DC-DC converter operating in ultrasonic skip mode during voice standby and full PWM during active call bursts. Use Value: Eliminates audible coil whine (<20kHz) while sustaining 28µA IQ; fast line/load transient response (<10µs) prevents audio clipping during RF transmit events. |
Use Scenario: Powers ARM Cortex-M based MCU in wrist-worn fitness trackers where thickness and battery capacity are severely limited. IC Role / Device Role / Timing Role: Compact, high-efficiency core supply enabling continuous sensor sampling and BLE advertising with minimal thermal rise. Use Value: SC70-6 footprint (2.0mm × 2.1mm) fits within 3.5mm × 3.5mm keep-out zone; 500mA capability supports simultaneous accelerometer, heart-rate, and BLE activity. |
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 |
|---|---|---|---|
| MAX8640YEXT25+T | 2MHz switching frequency, 2.2µH/4.7µF recommended external components, higher peak efficiency (~92% at 300mA) but larger solution size. | Better suited for applications prioritizing efficiency over footprint, e.g., mains-powered portable instruments with thermal margin. | Select when board area is less constrained and 2MHz operation better aligns with system EMI filtering strategy. |
| TPS62231DRVR | 3MHz switching, 2.5V fixed output, 400mA rated, 22µA IQ, 2.9–6.0V input, WSON-6 (2.0mm × 2.0mm) package. | Limited to 400mA output; lacks voltage-positioning architecture - requires larger output capacitance for equivalent transient performance. | Consider for cost-sensitive designs where 400mA suffices and TI's ecosystem support is preferred; verify transient response with 4.7µF output cap. |
Compared with MAX8640YEXT25+T and TPS62231DRVR, the MAX8640ZEXT25+T uniquely combines 4MHz operation, 500mA capability, and voltage-positioning feedback in an SC70-6 package - delivering the smallest possible 2.5V solution for high-transient, space-critical portable systems.
Availability
MAX8640ZEXT25+T is available at Aetrix Electronics and suitable for smartphone processor rails, wearable MCU supplies, digital camera I/O power, and Bluetooth audio codec applications requiring stable component supply and long-term manufacturability.
Supply support for MAX8640ZEXT25+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 MAX8640Y/MAX8640Z product line was designed specifically for ultra-compact, high-efficiency DC-DC conversion in battery-powered handheld electronics - emphasizing minimal external component count, low quiescent current, and robust transient response in sub-3mm² footprints.
FAQ
What is the exact output voltage and accuracy of MAX8640ZEXT25+T?
The MAX8640ZEXT25+T provides a factory-preset output voltage of 2.5V with ±1% initial accuracy at +25°C and ±2% over the full -40°C to +85°C operating temperature range. This precision eliminates the need for external feedback resistors and ensures reliable regulation without calibration in production.
Which package does MAX8640ZEXT25+T use, and what are its dimensions?
MAX8640ZEXT25+T uses the 6-pin SC70 package (package code X6S-1), measuring 2.0mm × 2.1mm with a maximum height of 0.9mm. It is lead-free and RoHS-compliant, marked "ACJ" on top, and compatible with standard reflow soldering profiles per JEDEC J-STD-020.
What are the recommended external components for MAX8640ZEXT25+T?
For MAX8640ZEXT25+T, the recommended components are a 1µH shielded inductor (e.g., Murata LQM31P series) and a 2.2µF X5R/X7R ceramic output capacitor placed adjacent to the OUT and GND pins. An input capacitor of ≥2.2µF ceramic is also required at the IN pin.
Does MAX8640ZEXT25+T support shutdown, and what is its shutdown current?
Yes, MAX8640ZEXT25+T supports active-low shutdown via the SHDN pin. When pulled low, it disables the switching regulator and resets internal logic, reducing supply current to 0.01µA typical. A minimum 10µs low pulse is required after VIN rises above UVLO (2.6V) to ensure proper reset.
How does the voltage-positioning feature of MAX8640ZEXT25+T improve load transient response?
The voltage-positioning feature in MAX8640ZEXT25+T samples feedback from the LX node instead of the output, removing phase lag caused by output capacitance. This yields load regulation equal to inductor DCR × load current, cutting peak-to-peak output voltage excursions by ~50% during 10mA–500mA transients compared to conventional architectures.
MAX8640ZEXT25+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
MAX8640ZEXT25+T FAQ
1.How can I place an order for MAX8640ZEXT25+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640ZEXT25+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 MAX8640ZEXT25+T reliable?
The price and inventory of MAX8640ZEXT25+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640ZEXT25+T is usually 5 days.
3.What payment methods are accepted for MAX8640ZEXT25+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640ZEXT25+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640ZEXT25+T?
MAX8640ZEXT25+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640ZEXT25+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 MAX8640ZEXT25+T?
For technical support, including MAX8640ZEXT25+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640ZEXT25+T requirements.
6.How does Aetrix verify that MAX8640ZEXT25+T is sourced from the original manufacturer or authorized distributors?
All MAX8640ZEXT25+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 MAX8640ZEXT25+T meets industry standards.
7.What is the process for return or replacement of MAX8640ZEXT25+T?
All MAX8640ZEXT25+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640ZEXT25+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 MAX8640ZEXT25+T part is unused and in its original packaging.
Return procedure for MAX8640ZEXT25+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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