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Analog Devices Inc./Maxim Integrated MAX8640YEXT12+T
- Part No.:
- MAX8640YEXT12+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX8640YEXT12+T.pdf
- Description:
- IC REG BUCK 1.2V 500MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,730
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Product details
Overview
MAX8640YEXT12+T from Maxim Integrated is a synchronous step-down DC-DC converter optimized for space-constrained, battery-powered applications. It delivers up to 500mA at a factory-preset 1.2V output, operates with a 2.7V–5.5V input, switches at up to 2MHz, and achieves 28µA quiescent current. It targets microprocessor core and I/O power in handheld devices.
For engineers reviewing the MAX8640YEXT12+T datasheet, MAX8640YEXT12+T pinout, MAX8640YEXT12+T application, or MAX8640YEXT12+T equivalent, key selection criteria include guaranteed 500mA output, ±1% initial voltage accuracy, ultrasonic pulse-skipping down to 1mA loads, voltage-positioning load regulation, and SC70 package compatibility with minimal external components (2.2µH inductor + 4.7µF capacitor).
Technical Context
The MAX8640YEXT12+T implements a proprietary hysteretic PWM control scheme that enables fast transient response and stable operation with tiny ceramic capacitors. Its voltage-positioning feedback architecture samples the LX node, eliminating phase lag from the output capacitor and enabling load regulation proportional to inductor DCR.
It integrates synchronous p-channel and n-channel MOSFETs with on-resistances of 0.6Ω (pFET) and 0.35Ω (nFET), supports active-low shutdown with 10µs minimum reset time, and features internal soft-start to suppress inrush current. Thermal shutdown activates at +160°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-preset 1.2V with ±1% initial accuracy - eliminates external resistor divider and ensures tight regulation at point-of-load. |
| Output Current | Guaranteed 500mA - supports demanding digital core and I/O rails in portable SoC designs. |
| Switching Frequency | Up to 2MHz - enables use of compact 2.2µH inductors and 4.7µF ceramic output capacitors without audible noise. |
| Quiescent Current | 28µA typical - extends battery life in always-on or low-duty-cycle modes (e.g., standby, sensor wake-up). |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li+ (2.7–4.2V), 3.3V rails, and 5V USB-supplied systems. |
| Load Regulation | Voltage-positioning type - output droop equals inductor DCR × load current, reducing transient overshoot by ~50% vs. conventional buck. |
| Shutdown Current | 0.01µA typical - enables true zero-power disable for system-level power gating. |
Pinout & Package
MAX8640YEXT12+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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LX) | Inductor switch node | High-current connection to internal pFET drain and nFET source; requires short, wide trace to minimize EMI and switching losses. |
| 2, 5 (GND) | Power ground | Dual GND pins must be connected together directly under the IC and tied to input/output capacitor grounds to ensure 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 loop stability. |
| 4 (SHDN) | Active-low enable | Logic-low disables regulator and resets internal logic; requires ≥10µs low pulse after VIN exceeds UVLO (2.6V typ) for reliable startup. |
| 6 (IN) | Input supply | Accepts 2.7V–5.5V; must be bypassed with ceramic capacitor near pin 6 and pin 5 to suppress switching noise and support peak current demands. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated pFET/nFET replaces external Schottky diode - improves full-load efficiency by ~10–15% and eliminates reverse recovery losses. |
| Ultrasonic pulse-skipping mode | Operates above 20kHz down to 1mA loads - prevents audible coil whine while maintaining <20mVpp output ripple. |
| Voltage-positioning load regulation | Feedback derived from LX node - reduces load-transient peak-to-peak excursion by ~50% versus traditional VOUT-sense buck regulators. |
| Internal soft-start | Eliminates inrush current at startup - allows use with high-impedance sources like coin cells or Li+ batteries without input voltage sag. |
| Fast line/load transient response | Sub-20µs recovery from 5mA ↔ 500mA load steps - maintains stable core voltage during processor burst activity. |
Applications
| Microprocessor Core Power | I/O Power Supply |
|---|---|
Use Scenario: Powers ARM Cortex-M4/M7 or RISC-V MCU cores requiring tightly regulated 1.2V at up to 500mA during active computation. IC Role / Device Role / Timing Role: Primary step-down regulator delivering clean, low-noise core voltage with fast transient response to handle CPU clock scaling events. Use Value: Voltage-positioning regulation minimizes output droop during sudden current surges, preventing timing violations and system resets. |
Use Scenario: Supplies 1.2V to high-speed serial interfaces (e.g., SPI, I²C, UART) and GPIO banks in wearables and IoT edge nodes. IC Role / Device Role / Timing Role: Dedicated low-noise, low-quiescent-current rail generator ensuring signal integrity and interface timing margins. Use Value: 28µA quiescent current and ultrasonic skip mode extend battery runtime in sleep-mode-dominated applications. |
| Cell Phone Baseband Power | Portable Medical Sensor Hub |
Use Scenario: Provides 1.2V to cellular baseband processors (e.g., Qualcomm Snapdragon modem subsystems) in slim smartphone designs. IC Role / Device Role / Timing Role: Compact, high-efficiency DC-DC converter meeting strict board area constraints and thermal limits in stacked PCB architectures. Use Value: 2MHz switching and SC70 package enable integration alongside RF modules without compromising EMI performance. |
Use Scenario: Powers multi-sensor fusion hubs (ECG, SpO₂, accelerometer) in FDA-cleared wearable monitors operating from coin-cell batteries. IC Role / Device Role / Timing Role: Primary power stage delivering stable 1.2V to mixed-signal ASICs with stringent low-noise and long-term reliability requirements. Use Value: ±1% initial accuracy and -40°C to +85°C guaranteed operation ensure consistent sensor calibration across environmental conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYT | 1.2V fixed, 2.05MHz switching, 400mA rated, 6-pin WSON (2.0mm × 2.0mm), 22µA IQ | Lower max output current; no voltage-positioning feedback - higher transient overshoot under dynamic loads | Preferred when board space is identical but 400mA suffices and cost sensitivity outweighs transient performance. |
| RT8059ZSP | 1.2V fixed, 1.5MHz switching, 600mA rated, 6-pin SOT-563 (2.1mm × 1.6mm), 35µA IQ | Higher current capability but slower switching - requires larger 4.7µH inductor and 10µF output capacitor | Chosen when higher output current headroom is needed and layout area allows slightly larger passive components. |
Compared with MAX8640YEXT12+T, TPS62231DRYT offers lower quiescent current but reduced load drive and transient immunity, while RT8059ZSP provides greater current margin at the expense of component size and switching noise profile - making MAX8640YEXT12+T optimal for ultra-compact, high-transient-demand 1.2V rails.
Availability
MAX8640YEXT12+T is available at Aetrix Electronics and suitable for microprocessor core power, I/O power, and portable medical sensor hub applications requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for MAX8640YEXT12+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 series belongs to Maxim's ultra-compact DC-DC converter product line, designed specifically for space- and efficiency-critical battery-powered handheld devices where minimal external components and sub-30µA quiescent current are mandatory.
FAQ
What is the output voltage and tolerance of the MAX8640YEXT12+T?
The MAX8640YEXT12+T is factory-preset to deliver 1.2V with ±1% initial accuracy at +25°C and ±2% over the full -40°C to +85°C operating temperature range. This tight tolerance eliminates the need for external feedback resistors and ensures reliable operation for precision 1.2V digital rails without calibration.
Does the MAX8640YEXT12+T require external compensation components?
No, the MAX8640YEXT12+T does not require external compensation components. Its proprietary hysteretic PWM control and voltage-positioning feedback architecture - which senses the LX node - provide inherent loop stability with only a 2.2µH inductor and 4.7µF ceramic output capacitor, simplifying design and reducing BOM count.
What is the recommended inductor and capacitor for the MAX8640YEXT12+T?
The MAX8640YEXT12+T is optimized for a 2.2µH inductor with 75–150mΩ DCR and a 4.7µF X5R/X7R ceramic output capacitor. Input capacitance should match or exceed inductance value in µF (e.g., ≥2.2µF); a 2.2µF ceramic capacitor placed close to the IN and GND pins is sufficient due to internal soft-start.
How does the MAX8640YEXT12+T behave during light-load conditions?
Below ~100mA, the MAX8640YEXT12+T automatically enters ultrasonic pulse-skipping mode, maintaining switching frequency above 20kHz while reducing quiescent current to 28µA typical. This preserves low output ripple and avoids audible noise, making it ideal for battery-powered devices with intermittent processing loads.
Is the MAX8640YEXT12+T pin-compatible with other variants in the MAX8640Y family?
Yes, all MAX8640Y variants - including MAX8640YEXT12+T - share identical 6-pin SC70 pinout, electrical interface, and functional behavior. Only the factory-preset output voltage and top-mark code differ; no PCB redesign is required when substituting between MAX8640YEXT08+T through MAX8640YEXT25+T.
MAX8640YEXT12+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX8640YEXT12+T FAQ
1.How can I place an order for MAX8640YEXT12+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640YEXT12+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 MAX8640YEXT12+T reliable?
The price and inventory of MAX8640YEXT12+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640YEXT12+T is usually 5 days.
3.What payment methods are accepted for MAX8640YEXT12+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640YEXT12+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640YEXT12+T?
MAX8640YEXT12+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640YEXT12+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 MAX8640YEXT12+T?
For technical support, including MAX8640YEXT12+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640YEXT12+T requirements.
6.How does Aetrix verify that MAX8640YEXT12+T is sourced from the original manufacturer or authorized distributors?
All MAX8640YEXT12+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 MAX8640YEXT12+T meets industry standards.
7.What is the process for return or replacement of MAX8640YEXT12+T?
All MAX8640YEXT12+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640YEXT12+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 MAX8640YEXT12+T part is unused and in its original packaging.
Return procedure for MAX8640YEXT12+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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