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Analog Devices Inc./Maxim Integrated MAX8640YEXT18+T
- Part No.:
- MAX8640YEXT18+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
MAX8640YEXT18+T.pdf
- Description:
- IC REG BUCK 1.8V 500MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,911
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Product details
Overview
MAX8640YEXT18+T from Maxim Integrated is a synchronous step-down DC-DC converter optimized for space-constrained portable applications, delivering 500mA output at factory-preset 1.8V with ±1% initial accuracy, 2MHz switching frequency, and 28µA quiescent current. It integrates p-channel and n-channel MOSFETs in a 6-pin SC70 package (2.0mm × 2.1mm) and targets microprocessor core and I/O power rails in handheld devices.
For engineers reviewing the MAX8640YEXT18+T datasheet, MAX8640YEXT18+T pinout, MAX8640YEXT18+T application, or MAX8640YEXT18+T equivalent, key selection criteria include guaranteed 500mA load capability, voltage-positioning load regulation, ultrasonic pulse-skipping mode down to 1mA, fast transient response, and compatibility with tiny 2.2µH/4.7µF external components.
Technical Context
The MAX8640YEXT18+T employs a proprietary hysteretic PWM control scheme that enables fixed 2MHz operation-optimized for efficiency over size trade-offs-while maintaining low output ripple across all loads. Its voltage-positioning feedback architecture samples the LX node directly, eliminating phase lag from output capacitance and enabling stable loop response with minimal ceramic output capacitance.
This architecture yields load regulation equal to the inductor's DC resistance multiplied by load current, reducing peak-to-peak output excursions by ~50% during transients versus conventional buck converters. Internal synchronous rectification replaces external Schottky diodes, and fast soft-start eliminates inrush current without requiring external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-preset 1.8V with ±1% initial accuracy at +25°C; supports stable core/I/O rail without external resistors. |
| Switching Frequency | Fixed 2.0MHz-enables use of compact 2.2µH inductor and 4.7µF ceramic output capacitor. |
| Max Output Current | Guaranteed 500mA continuous-supports demanding digital loads like DSP cores and high-speed I/O buffers. |
| Quiescent Current | 28µA typical at no load-extends battery life in always-on or low-duty-cycle portable systems. |
| Input Voltage Range | 2.7V to 5.5V-compatible with single-cell Li+ (3.0–4.2V), alkaline (3.0–4.5V), and regulated 3.3V/5V supplies. |
| Load Transient Response | Ultra-fast recovery with <100µs settling time for 5mA ↔ 500mA steps-minimizes voltage droop during processor burst activity. |
| Shutdown Current | 0.01µA typical-reduces system standby power to negligible levels when disabled via SHDN pin. |
Pinout & Package
MAX8640YEXT18+T is housed in a lead-free, RoHS-compliant 6-pin SC70 package (2.0mm × 2.1mm), optimized for high-density PCB layouts in portable electronics. Thermal performance is rated at 245mW continuous power dissipation at +70°C (derated 3.1mW/°C above).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LX) | Inductor switch node | High-current connection to internal p-channel and n-channel MOSFET drains; requires short, wide trace routing to minimize EMI and voltage spikes. |
| 2,5 (GND) | Ground reference | Dual ground pins must be connected together directly under IC and tied to input/output capacitor grounds for low-impedance return path. |
| 3 (OUT) | Output voltage sense | Internally connected to feedback network; bypass with ceramic capacitor placed adjacent to pin 3 and pin 2 for stability and ripple suppression. |
| 4 (SHDN) | Active-low enable | Logic-low ≥10µs after VIN exceeds UVLO (2.6V typ) resets internal logic; enables precise sequencing and ultra-low-power shutdown. |
| 6 (IN) | Power input | Accepts 2.7V–5.5V supply; requires local 2.2µF ceramic bypass capacitor between pin 6 and pin 5 (GND) to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-positioning load regulation | Output voltage drop equals inductor DCR × load current-enables predictable, linear droop and halves transient overshoot vs. standard buck regulators. |
| Ultrasonic pulse-skipping mode | Operates >20kHz down to 1mA load-eliminates audible noise while maintaining 28µA quiescent current and low output ripple. |
| Internal synchronous rectification | Integrated n-channel MOSFET replaces external Schottky diode-improves full-load efficiency by ~8–12% and reduces thermal footprint. |
| Fast soft-start | Eliminates inrush current at startup-reduces required input capacitance and prevents brownout on high-impedance sources like coin cells. |
| Stable with small ceramic capacitors | Supports 4.7µF X5R/X7R output cap-avoids large tantalum or electrolytic caps, saving board area and improving reliability. |
Applications
| Smartphone Application Processor Core | Portable Medical Sensor Node |
|---|---|
Use Scenario: Powers ARM Cortex-A series CPU core in smartphone SoC during active and burst modes. IC Role / Device Role / Timing Role: Primary 1.8V core regulator with dynamic load handling up to 500mA and sub-100µs transient recovery. Use Value: Voltage-positioning regulation ensures predictable core voltage droop during clock-gated bursts, simplifying power management firmware and avoiding guardbanding. |
Use Scenario: Supplies 1.8V to ultra-low-power MCU and analog front-end in wearable ECG patch. IC Role / Device Role / Timing Role: Always-on power source with 28µA quiescent current and ultrasonic skip mode for silent operation. Use Value: Enables multi-week battery life on CR2032 while maintaining clean 1.8V rail for precision ADC sampling and RF transmission. |
| Industrial Handheld Scanner | Wireless Audio Earbud Codec |
Use Scenario: Powers FPGA-based image processing engine and laser driver in rugged barcode scanner. IC Role / Device Role / Timing Role: High-efficiency 1.8V rail supporting 300–500mA pulsed loads during scan cycles. Use Value: 2MHz switching allows compact 2.2µH inductor and avoids interference with 2.4GHz Bluetooth coexistence. |
Use Scenario: Delivers clean 1.8V to low-latency audio codec and MEMS microphone preamp in TWS earbuds. IC Role / Device Role / Timing Role: Low-noise, fast-transient regulator minimizing PSRR impact on analog audio paths. Use Value: Sub-10mVpp output ripple at 200mA ensures <−95dB THD+N in DAC output, critical for high-fidelity playback. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS62231DRYT | 1.8V fixed, 3MHz switching, 300mA max output, 22µA IQ, 5-pin DSBGA | Lower current rating and smaller package limit use in high-pulse-load scenarios like imaging modules. | Select when board area is more constrained than current capability and 300mA suffices. |
| Analog Devices ADP2119ACPZ-R7 | 1.8V fixed, 1.2MHz switching, 600mA max output, 40µA IQ, 6-pin LFCSP | Slower switching requires larger 4.7µH inductor; higher IQ reduces battery runtime in always-on nodes. | Select when thermal margin is critical and lower-frequency EMI filtering is preferred over size reduction. |
Compared with MAX8640YEXT18+T, the TPS62231DRYT offers smaller footprint but sacrifices 200mA output headroom and lacks voltage-positioning regulation, while the ADP2119ACPZ-R7 provides higher current and robust thermal performance at the cost of larger magnetics and reduced light-load efficiency.
Availability
MAX8640YEXT18+T is available at Aetrix Electronics and suitable for smartphone application processor core power, portable medical sensor node supply, industrial handheld scanner FPGA power, and wireless audio earbud codec rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8640YEXT18+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 devices where board space, quiescent current, and transient response are critical constraints.
FAQ
What is the factory-preset output voltage of the MAX8640YEXT18+T?
The MAX8640YEXT18+T is factory-configured for a nominal 1.8V output with ±1% initial accuracy at +25°C and ±2% over the full -40°C to +85°C operating temperature range. This fixed output eliminates the need for external feedback resistors and simplifies layout in space-sensitive designs.
Does the MAX8640YEXT18+T require external compensation components?
No, the MAX8640YEXT18+T uses an internally compensated voltage-positioning architecture that samples the LX node directly. This eliminates external compensation networks and ensures stability with only a 4.7µF ceramic output capacitor, as specified in the Selector Guide for this part number.
Can the MAX8640YEXT18+T operate from a single alkaline cell?
Yes-the MAX8640YEXT18+T supports an input voltage range of 2.7V to 5.5V, making it compatible with fresh alkaline cells (up to ~1.6V per cell). Two cells in series (2.4–3.2V) fall within specification, though operation near the 2.7V UVLO threshold requires careful attention to input impedance and decoupling.
What is the minimum recommended output capacitor for the MAX8640YEXT18+T?
The MAX8640YEXT18+T is characterized and guaranteed to operate stably with a 4.7µF X5R or X7R ceramic output capacitor, as listed in the Selector Guide. Using smaller values may compromise transient response and loop stability, especially under 500mA load steps.
How does the MAX8640YEXT18+T handle load transients compared to traditional buck converters?
The MAX8640YEXT18+T uses voltage-positioning load regulation, where output droop equals inductor DCR × load current. This results in predictable, linear voltage drop and cuts peak-to-peak output excursions by approximately 50% during 5mA ↔ 500mA transients versus conventional buck regulators with standard feedback topologies.
MAX8640YEXT18+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:
- Active
- 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):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
MAX8640YEXT18+T FAQ
1.How can I place an order for MAX8640YEXT18+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640YEXT18+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 MAX8640YEXT18+T reliable?
The price and inventory of MAX8640YEXT18+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640YEXT18+T is usually 5 days.
3.What payment methods are accepted for MAX8640YEXT18+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640YEXT18+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640YEXT18+T?
MAX8640YEXT18+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640YEXT18+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 MAX8640YEXT18+T?
For technical support, including MAX8640YEXT18+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640YEXT18+T requirements.
6.How does Aetrix verify that MAX8640YEXT18+T is sourced from the original manufacturer or authorized distributors?
All MAX8640YEXT18+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 MAX8640YEXT18+T meets industry standards.
7.What is the process for return or replacement of MAX8640YEXT18+T?
All MAX8640YEXT18+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640YEXT18+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 MAX8640YEXT18+T part is unused and in its original packaging.
Return procedure for MAX8640YEXT18+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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