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Analog Devices Inc./Maxim Integrated MAX8640YEXT19+
- Part No.:
- MAX8640YEXT19+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX8640YEXT19+.pdf
- Description:
- IC REG BUCK 1.9V 500MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,147
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Product details
Overview
MAX8640YEXT19+ from Maxim Integrated is a synchronous step-down DC-DC converter optimized for space-constrained portable applications. It delivers up to 500mA at a factory-preset 1.9V output, operates with a 2MHz switching frequency, uses only a 2.2µH inductor and 4.7µF output capacitor, and achieves 28µA quiescent current - enabling long battery life in handheld devices.
For engineers reviewing the MAX8640YEXT19+ datasheet, MAX8640YEXT19+ pinout, MAX8640YEXT19+ application, or MAX8640YEXT19+ equivalent, key selection criteria include guaranteed 500mA output at 1.9V, SC70 package footprint (2.0mm × 2.1mm), ultrasonic pulse-skipping mode down to 1mA loads, voltage-positioning load regulation, and internal synchronous rectification eliminating external Schottky diodes.
Technical Context
The MAX8640YEXT19+ implements a proprietary hysteretic PWM control scheme that enables fast line/load transient response and stable operation with tiny ceramic capacitors. Its voltage-positioning feedback architecture samples the LX node directly, removing phase lag from the output capacitor and yielding load regulation equal to the inductor's DC resistance multiplied by load current.
This architecture eliminates overshoot during load transients and supports ultrasonic skip-mode operation down to 1mA loads while maintaining low output ripple across all operating conditions. The device integrates both high-side pFET and low-side nFET switches with on-resistances of 0.6Ω (typ) and 0.35Ω (typ), respectively, and features internal soft-start to suppress inrush current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-preset 1.9V ±1% initial accuracy - eliminates external feedback resistors and reduces BOM count. |
| Switching Frequency | Up to 2MHz - enables use of small 2.2µH inductors and compact PCB layout without audible noise. |
| Max Output Current | 500mA guaranteed - sufficient for microprocessor I/O rails or DSP core supplies in portable systems. |
| Quiescent Current | 28µA typical - extends battery runtime in always-on or low-duty-cycle applications. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li+ (3.0–4.2V), alkaline, or regulated 3.3V/5V supplies. |
| Package | 6-pin SC70 (2.0mm × 2.1mm) - ultra-small footprint ideal for space-limited handheld designs. |
| Shutdown Current | 0.01µA typical - ensures near-zero power draw when disabled, critical for system-level power gating. |
Pinout & Package
MAX8640YEXT19+ is housed in a lead-free, RoHS-compliant 6-pin SC70 package (2.0mm × 2.1mm). The package supports reflow soldering and provides thermal performance suitable for continuous 500mA operation within -40°C to +85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LX) | Inductor switch node | Connects to drain terminals of internal pFET and nFET; carries high di/dt switching current - requires short, wide trace routing. |
| 2, 5 (GND) | Power ground | Dual ground pins must be connected together directly under IC and tied to input/output capacitor grounds to minimize ground bounce. |
| 3 (OUT) | Output voltage sense | Internally connected to feedback network; bypass with ceramic capacitor placed adjacent to pin 3 and pin 2 for stability. |
| 4 (SHDN) | Active-low enable | Logic-low ≥10µs after VIN exceeds UVLO (2.6V typ) resets internal logic; drives <0.01µA in shutdown mode. |
| 6 (IN) | Input supply | Accepts 2.7V–5.5V; bypass with ceramic capacitor placed adjacent to pin 6 and pin 5 to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-positioning load regulation | Load regulation = IL × RDCR(L); reduces peak-to-peak output excursions by ~50% vs. conventional buck converters during transients. |
| Ultrasonic pulse-skipping mode | Maintains >20kHz switching frequency down to 1mA loads - avoids audible noise while preserving low IQ. |
| Internal synchronous rectification | Replaces external Schottky diode; improves efficiency by ~8–12% at medium loads and simplifies layout. |
| Fast soft-start | Eliminates inrush current - reduces required input capacitance and prevents brownout on weak sources like coin cells. |
| Proprietary hysteretic PWM control | Enables sub-1µs load transient response and stable operation with 4.7µF ceramic output capacitors. |
Applications
| Microprocessor I/O Power | Cell Phone Baseband Core |
|---|---|
|
Use Scenario: Powering 1.8V or 1.9V I/O banks of ARM-based microcontrollers in wearables and IoT edge nodes. IC Role / Device Role / Timing Role: Primary step-down regulator delivering clean, regulated 1.9V from a shared 3.6V Li+ battery rail. Use Value: 28µA quiescent current extends standby time; 2MHz switching allows minimal board area; SC70 package fits tight keep-out zones. |
Use Scenario: Supplying baseband processor core voltage in dual-SIM smartphones where space and thermal density are constrained. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with fast transient response to handle burst-mode processing demands. Use Value: Voltage-positioning regulation cuts load-transient overshoot by half; ultrasonic skip mode prevents audio band interference. |
| Digital Still Camera Sensor Bias | Bluetooth Audio SoC Power |
|
Use Scenario: Providing stable 1.9V bias to CMOS image sensor analog front-end in compact DSC modules. IC Role / Device Role / Timing Role: Low-noise, low-ripple DC-DC source with minimized EMI impact on sensitive analog imaging circuits. Use Value: Low output ripple (<10mVpp) maintained across load range; internal soft-start prevents sensor reset glitches at power-up. |
Use Scenario: Powering Bluetooth 5.0 LE audio SoCs (e.g., CSR8675, DA1469x) requiring precise 1.9V core voltage. IC Role / Device Role / Timing Role: Efficient, compact regulator supporting dynamic voltage scaling during codec activity bursts. Use Value: 500mA capability handles peak RF transmit current; 2MHz operation avoids interference with 2.4GHz ISM band harmonics. |
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 | 2.25V–5.5V input; 1.9V fixed output; 3MHz switching; 400mA rated; 6-pin WSON (2.0mm × 2.0mm) | Limited to 400mA max output - insufficient for sustained 500mA loads; higher switching frequency increases EMI filtering complexity. | Select only if 400mA output suffices and WSON package compatibility is required. |
| RT8059ZSP | 2.5V–5.5V input; adjustable 0.6V–3.3V output; 2MHz switching; 600mA rated; 6-pin SOT-563 (1.6mm × 1.6mm) | Requires external feedback resistors; no factory preset 1.9V option; smaller package but lower thermal dissipation margin at 500mA. | Choose when adjustable output or tighter footprint is prioritized over preset simplicity and thermal headroom. |
Compared with TPS62231DRYT and RT8059ZSP, the MAX8640YEXT19+ uniquely combines factory-preset 1.9V, guaranteed 500mA delivery, voltage-positioning regulation, and SC70 packaging - making it optimal for production-ready, space-constrained 1.9V rail designs where BOM reduction and transient robustness are critical.
Availability
MAX8640YEXT19+ is available at Aetrix Electronics and suitable for microprocessor I/O power, cell phone baseband core supplies, and digital still camera sensor bias applications requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for MAX8640YEXT19+ 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 series was designed specifically for ultra-compact, high-efficiency DC-DC conversion in battery-powered handheld devices - emphasizing minimal external components, low quiescent current, and robust transient response in sub-3mm² footprints.
FAQ
What is the exact output voltage of MAX8640YEXT19+ and how is it set?
The MAX8640YEXT19+ delivers a factory-preset 1.9V output with ±1% initial accuracy at +25°C and ±2% over the full -40°C to +85°C temperature range. This voltage is internally trimmed during wafer test and requires no external feedback resistors - reducing component count and layout complexity. The top-mark "ACH" on the SC70 package confirms this specific 1.9V variant.
Does MAX8640YEXT19+ require an external Schottky diode?
No, the MAX8640YEXT19+ does not require an external Schottky diode. It integrates both a high-side p-channel MOSFET and a low-side n-channel MOSFET for synchronous rectification. This internal architecture replaces the external diode used in nonsynchronous buck converters, improving efficiency by 8–12% at medium loads and eliminating associated layout and thermal concerns.
What is the minimum input voltage required for MAX8640YEXT19+ to operate?
The MAX8640YEXT19+ begins operation when the input voltage rises above its undervoltage lockout (UVLO) threshold of 2.6V (typical), with 100mV hysteresis. Its specified input range is 2.7V to 5.5V, making it compatible with single-cell Li+ batteries (fully charged at 4.2V, discharged to ~3.0V) and regulated 3.3V or 5V system rails. Operation below 2.7V is not guaranteed.
Can MAX8640YEXT19+ be used with a 1µH inductor?
No - the MAX8640YEXT19+ is the Y-version, optimized for 2.2µH inductors and 2MHz operation. Using a 1µH inductor (designed for the Z-version's 4MHz operation) would cause instability, excessive ripple, and potential current-limit triggering. The Selector Guide explicitly lists L1 = 2.2µH and C2 = 4.7µF for MAX8640YEXT19+, and deviating invalidates guaranteed performance.
How does MAX8640YEXT19+ handle load transients compared to standard buck converters?
The MAX8640YEXT19+ uses voltage-positioning feedback - sampling the LX node instead of the output - which removes phase lag from the output capacitor. This yields load regulation equal to IL × RDCR(L) and cuts peak-to-peak output-voltage excursions by approximately 50% during load transients versus conventional buck converters, as verified in Figure toc04 and toc11/toc12 of the datasheet.
MAX8640YEXT19+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Product Status:
- Obsolete
- 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:
- -
MAX8640YEXT19+ FAQ
1.How can I place an order for MAX8640YEXT19+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640YEXT19+ 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 MAX8640YEXT19+ reliable?
The price and inventory of MAX8640YEXT19+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640YEXT19+ is usually 5 days.
3.What payment methods are accepted for MAX8640YEXT19+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640YEXT19+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640YEXT19+?
MAX8640YEXT19+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640YEXT19+ 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 MAX8640YEXT19+?
For technical support, including MAX8640YEXT19+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640YEXT19+ requirements.
6.How does Aetrix verify that MAX8640YEXT19+ is sourced from the original manufacturer or authorized distributors?
All MAX8640YEXT19+ 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 MAX8640YEXT19+ meets industry standards.
7.What is the process for return or replacement of MAX8640YEXT19+?
All MAX8640YEXT19+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640YEXT19+, 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 MAX8640YEXT19+ part is unused and in its original packaging.
Return procedure for MAX8640YEXT19+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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