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Analog Devices Inc./Maxim Integrated MAX8640YEXT15+T
- Part No.:
- MAX8640YEXT15+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
MAX8640YEXT15+T.pdf
- Description:
- IC REG BUCK 1.5V 500MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,108
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Product details
Overview
MAX8640YEXT15+T from Maxim Integrated is a synchronous step-down DC-DC converter optimized for space-constrained portable applications, delivering 500mA output at factory-preset 1.5V with 2MHz switching frequency, 28µA quiescent current, and ±1% initial output voltage accuracy. It integrates p-channel and n-channel MOSFETs, supports input range 2.7V–5.5V, and eliminates external feedback components.
For engineers reviewing the MAX8640YEXT15+T datasheet, MAX8640YEXT15+T pinout, MAX8640YEXT15+T application, or MAX8640YEXT15+T equivalent, key selection criteria include guaranteed 500mA load capability, ultrasonic pulse-skipping mode down to 1mA, voltage-positioning load regulation, fast transient response, and SC70 package compatibility with tight PCB area budgets.
Technical Context
The MAX8640YEXT15+T employs a proprietary hysteretic PWM control scheme enabling fixed 2MHz operation (confirmed in Selector Guide), delivering stable 1.5V output without external resistive feedback. Its voltage-positioning architecture samples the LX node directly, removing phase lag from output capacitance and enabling use of only 4.7µF ceramic output capacitor while maintaining loop stability.
Internal synchronous rectification replaces external Schottky diodes, reducing conduction losses; fast soft-start limits inrush current; and shutdown mode reduces supply current to 0.01µA. The device operates across –40°C to +85°C and features thermal shutdown at +160°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-preset 1.5V ±1% initial accuracy - eliminates external resistor divider and saves board space. |
| Switching Frequency | Fixed 2.0MHz - enables use of compact 2.2µH inductor and 4.7µF output capacitor. |
| Max Output Current | 500mA guaranteed - supports core/I/O power for microprocessors and DSPs in handheld devices. |
| Quiescent Current | 28µA typical - extends battery life in always-on or low-duty-cycle portable systems. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single Li+ cell, 3.3V rails, and dual alkaline/NiMH supplies. |
| Load Regulation | Voltage-positioning type - output droop equals inductor DCR × load current, minimizing transient overshoot. |
| Shutdown Current | 0.01µA typical - ensures near-zero power draw when disabled, critical for system-level power gating. |
Pinout & Package
MAX8640YEXT15+T is housed in a lead-free, RoHS-compliant 6-pin SC70 package (2.0mm × 2.1mm), optimized for high-density portable PCB layouts. Thermal performance is rated at 245mW continuous power dissipation at +70°C (derating 3.1mW/°C above).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | LX | Switch node connecting internal p-FET drain and n-FET source - requires short, low-inductance trace to inductor; high-impedance during shutdown. |
| 2, 5 | GND | Dual ground terminals - must be connected together directly under IC and tied to input/output capacitor grounds to minimize noise and improve thermal dissipation. |
| 3 | OUT | Output sense input - internally connected to feedback network; bypass with ceramic capacitor adjacent to pin for stability and ripple suppression. |
| 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 (2.7V–5.5V) - bypass with ceramic capacitor close to pin and GND to suppress switching noise and support peak current demands. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrasonic skip mode | Maintains >20kHz switching frequency down to 1mA load - avoids audible noise in audio-sensitive portable devices. |
| Voltage-positioning load regulation | Output droop tracks inductor DCR × ILOAD - reduces peak-to-peak transient excursions by ~50% vs. conventional buck regulators. |
| Internal synchronous rectification | Replaces external Schottky diode - improves full-load efficiency and eliminates diode forward-voltage drop and thermal management overhead. |
| Fast soft-start | Eliminates inrush current at startup - reduces required input capacitance and prevents brownout on weak sources like coin cells or Li+ batteries. |
| Small external component count | Only 2.2µH inductor + 4.7µF output capacitor needed - enables total solution footprint under 12mm² including passives. |
Applications
| Microprocessor Core Power | I/O Power Supply |
|---|---|
|
Use Scenario: Powers ARM Cortex-M or RISC-V MCU cores requiring stable 1.5V at up to 500mA in wearables and sensor nodes. IC Role / Device Role / Timing Role: Primary voltage regulator delivering tightly regulated core rail with fast load-transient response to handle burst-mode CPU activity. Use Value: Voltage-positioning regulation cuts transient overshoot by half versus standard buck converters, preventing core latch-up during sudden current demand spikes. |
Use Scenario: Supplies 1.5V I/O banks for FPGA configuration interfaces or high-speed serial peripherals in compact PDAs. IC Role / Device Role / Timing Role: Dedicated point-of-load regulator ensuring clean, low-noise I/O voltage independent of main system rail fluctuations. Use Value: 2MHz switching allows ultra-small 2.2µH inductor placement adjacent to I/O pins, minimizing trace inductance and EMI coupling into sensitive signal paths. |
| Smartphone Baseband Power | Portable Medical Sensor Hub |
|
Use Scenario: Provides 1.5V supply to baseband processor subsystems in LTE-enabled feature phones with strict size constraints. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating from shared 3.6V battery rail, supporting dynamic voltage scaling during call/data sessions. Use Value: 28µA quiescent current extends standby time between cellular handshakes; ultrasonic skip mode prevents interference with RF front-end receivers. |
Use Scenario: Powers analog front-end and low-power MCU in FDA-cleared glucose monitors or pulse oximeters running on single AAA cells. IC Role / Device Role / Timing Role: Primary power stage converting 3.0V alkaline input to precise 1.5V for ADC reference and sensor biasing circuits. Use Value: ±1% initial output accuracy ensures consistent sensor calibration across production units; SC70 package fits within 8mm × 8mm PCB area budget. |
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 |
|---|---|---|---|
| TPS62231DRYT | 2.25MHz fixed-frequency, 300mA output, 0.6V–5.5V adjustable output - requires external feedback resistors. | Lower max current and no factory preset - suitable for designs needing flexible VOUT but not 500mA at 1.5V. | Select if adjustable output and higher light-load efficiency (22µA IQ) outweigh need for 500mA and preset simplicity. |
| RT8059GJ6 | 1.5MHz, 600mA, 0.6V–3.3V adjustable output, 30µA IQ - uses external feedback and lacks voltage-positioning architecture. | Higher current headroom but slower transient response and larger minimum external components (3.3µH/10µF typical). | Choose when higher output current margin is critical and board area permits larger inductor/capacitor footprints. |
Compared with TPS62231DRYT and RT8059GJ6, the MAX8640YEXT15+T delivers higher guaranteed output current in a smaller footprint, achieves superior transient suppression via voltage-positioning, and eliminates feedback components - making it optimal for space- and accuracy-constrained 1.5V core power applications.
Availability
MAX8640YEXT15+T is available at Aetrix Electronics and suitable for microprocessor core power, I/O supply, and portable medical sensor hub applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX8640YEXT15+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 markets.
The MAX8640Y/MAX8640Z product line was designed specifically for ultra-compact, high-efficiency DC-DC conversion in battery-powered handheld devices where board area, quiescent current, and transient performance are critical.
FAQ
What is the factory-preset output voltage of the MAX8640YEXT15+T?
The MAX8640YEXT15+T is factory-preset to deliver a nominal 1.5V output with ±1% initial accuracy at +25°C and ±2% over the full –40°C to +85°C operating temperature range. This eliminates the need for external feedback resistors and simplifies layout in space-constrained designs.
Does the MAX8640YEXT15+T require an external Schottky diode?
No, the MAX8640YEXT15+T does not require an external Schottky diode because it integrates synchronous rectification using internal n-channel MOSFETs. This design improves efficiency across the full load range and removes the thermal and footprint penalties associated with discrete diodes.
What is the recommended inductor and output capacitor for the MAX8640YEXT15+T?
The MAX8640YEXT15+T is optimized for a 2.2µH inductor and 4.7µF ceramic output capacitor, as specified in the Selector Guide. These values support stable 2MHz operation, low output ripple, and fast transient response while maintaining minimal solution size.
How does the MAX8640YEXT15+T handle light-load conditions?
The MAX8640YEXT15+T automatically enters ultrasonic pulse-skipping mode below ~100mA, reducing quiescent current to 28µA typical. Switching remains above 20kHz even at 1mA loads, preventing audible noise and maintaining regulation without external control.
What package type and dimensions does the MAX8640YEXT15+T use?
The MAX8640YEXT15+T uses a lead-free, RoHS-compliant 6-pin SC70 package measuring 2.0mm × 2.1mm. Its small footprint and dual GND pins support high-density layouts and efficient thermal dissipation in portable electronics.
MAX8640YEXT15+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):
- 1.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
MAX8640YEXT15+T FAQ
1.How can I place an order for MAX8640YEXT15+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640YEXT15+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 MAX8640YEXT15+T reliable?
The price and inventory of MAX8640YEXT15+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640YEXT15+T is usually 5 days.
3.What payment methods are accepted for MAX8640YEXT15+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640YEXT15+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640YEXT15+T?
MAX8640YEXT15+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640YEXT15+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 MAX8640YEXT15+T?
For technical support, including MAX8640YEXT15+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640YEXT15+T requirements.
6.How does Aetrix verify that MAX8640YEXT15+T is sourced from the original manufacturer or authorized distributors?
All MAX8640YEXT15+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 MAX8640YEXT15+T meets industry standards.
7.What is the process for return or replacement of MAX8640YEXT15+T?
All MAX8640YEXT15+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640YEXT15+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 MAX8640YEXT15+T part is unused and in its original packaging.
Return procedure for MAX8640YEXT15+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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