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Analog Devices Inc./Maxim Integrated MAX8640YEXT19+T
- Part No.:
- MAX8640YEXT19+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
MAX8640YEXT19+T.pdf
- Description:
- IC REG BUCK 1.9V 500MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,112
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Product details
Overview
MAX8640YEXT19+T from Maxim Integrated is a synchronous step-down DC-DC converter optimized for space-constrained portable applications, delivering 500mA output current at a factory-preset 1.9V output voltage with ±1% initial accuracy, operating up to 2MHz switching frequency, and consuming only 28µA quiescent current. It integrates high-side and low-side MOSFETs in a 6-pin SC70 package and targets microprocessor core and I/O power rails in handheld devices.
For engineers reviewing the MAX8640YEXT19+T datasheet, MAX8640YEXT19+T pinout, MAX8640YEXT19+T application, or MAX8640YEXT19+T equivalent, key selection criteria include its 1.9V fixed output, 2MHz switching frequency enabling compact 2.2µH/4.7µF external components, voltage-positioning load regulation, ultrasonic pulse-skipping mode down to 1mA, and SC70 thermal performance (245mW at +70°C).
Technical Context
The MAX8640YEXT19+T employs a proprietary hysteretic PWM control scheme that dynamically adjusts switching frequency based on load-maintaining 2MHz operation across full load while enabling ultrasonic skip mode below 100mA. Its voltage-positioning feedback architecture samples the LX node directly, eliminating phase lag from output capacitance and yielding load regulation equal to inductor DCR × ILOAD.
This architecture enables fast line- and load-transient response with halved peak-to-peak output excursions versus conventional buck converters, while internal synchronous rectification replaces external Schottky diodes and achieves typical efficiency >90% at 100mA–300mA loads with 3.6V input and 1.9V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-preset 1.9V with ±1% initial accuracy-eliminates external resistor divider and ensures stable core/I/O rail without calibration. |
| Switching Frequency | Up to 2MHz-enables use of small 2.2µH inductor and 4.7µF ceramic output capacitor, reducing board area by >40% vs. 500kHz solutions. |
| Output Current | Guaranteed 500mA continuous-supports demanding DSP/microprocessor I/O rails without derating at +85°C ambient. |
| Quiescent Current | 28µA typical-extends battery life in always-on subsystems such as real-time clocks or sensor interfaces. |
| Input Voltage Range | 2.7V to 5.5V-compatible with single-cell Li+ (3.0–4.2V), alkaline (3.0–4.5V), and USB-powered systems. |
| Shutdown Current | 0.01µA typical-minimizes leakage in system sleep states, critical for multi-week standby in portable medical devices. |
| Load Regulation | Voltage-positioning architecture: ΔVOUT = ILOAD × RDCR(L)-reduces transient overshoot by 50% and eliminates need for large bulk capacitance. |
Pinout & Package
MAX8640YEXT19+T is housed in a lead-free, RoHS-compliant 6-pin SC70 package (2.0mm × 2.1mm), rated for -40°C to +85°C operation. Thermal resistance θJA is 323°C/W, with 245mW maximum continuous power dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - LX | Inductor switch node | Connects to internal p-channel and n-channel MOSFET drains; requires short, low-inductance trace to minimize EMI and ringing during 2MHz switching. |
| 2,5 - GND | Power and signal ground | Two dedicated ground pins must be connected together directly under IC and tied to input/output capacitor grounds to ensure stable feedback and thermal path. |
| 3 - OUT | Output voltage sense and feedback | Internally connected to precision voltage reference; bypass with ≥1µF ceramic capacitor placed adjacent to pin 3 and pin 2 for loop stability. |
| 4 - SHDN | Active-low enable/disable control | Logic-low ≥10µs after VIN exceeds UVLO (2.6V) resets internal logic; drives <0.01µA shutdown current and places LX in high-impedance state. |
| 6 - IN | Main power input | Accepts 2.7–5.5V; requires local 2.2µF ceramic bypass capacitor placed within 2mm of pin 6 and pin 5 to suppress switching noise and supply current spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-positioning feedback | Direct LX-node sensing removes output capacitor phase lag, enabling stable regulation with ≤4.7µF ceramic output caps and halving transient voltage excursions. |
| Ultrasonic pulse-skipping mode | Operates above 20kHz down to 1mA load-prevents audible noise in audio-sensitive applications like MP3 players and hearing aids. |
| Internal synchronous rectification | Integrated n-channel MOSFET replaces external Schottky diode, improving light-load efficiency by 8–12% and eliminating reverse recovery losses. |
| Fast soft-start | Eliminates inrush current at startup-reduces required input capacitance by 50% and prevents brownout in high-impedance Li+ battery sources. |
| ±1% output voltage accuracy | Tight initial tolerance ensures reliable operation of 1.8V/1.9V I/O domains without margining, simplifying power sequencing in multi-rail systems. |
Applications
| Microprocessor Core Power | I/O Power Supply |
|---|---|
|
Use Scenario: Powering ARM Cortex-M4 core in wearable fitness tracker with 1.9V I/O requirement and tight PCB area budget. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated 1.9V at up to 500mA with fast load-transient response to handle CPU burst activity. Use Value: 2MHz switching enables 2.2µH/4.7µF BOM, reducing solution footprint to <12mm²; voltage positioning minimizes VOUT droop during 100mA→400mA transients. |
Use Scenario: Supplying 1.9V to SDIO interface and USB PHY in smartphone auxiliary module. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter providing low-noise, tightly regulated rail with <10µs line-transient recovery (4V→3.5V→4V). Use Value: 28µA quiescent current extends standby time; SC70 package allows placement adjacent to connector, minimizing trace inductance and EMI coupling. |
| Cell Phone Baseband Power | Portable Medical Sensor Hub |
|
Use Scenario: Delivering 1.9V to LTE baseband processor in ultra-thin feature phone with 3.7V Li-ion input. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating across full 2.7–5.5V input range with integrated MOSFETs and no external diode. Use Value: 92% peak efficiency at 200mA reduces thermal load in sealed enclosure; 2MHz operation avoids AM radio band interference. |
Use Scenario: Powering ECG analog front-end and BLE SoC in disposable patch monitor requiring multi-week battery life. IC Role / Device Role / Timing Role: Low-quiescent-current buck regulator with shutdown control synchronized to sensor sampling intervals. Use Value: 0.01µA shutdown current and ultrasonic skip mode extend CR2032 battery life beyond 12 weeks; ±1% accuracy ensures ADC reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYT | 1.9V fixed output, 3MHz switching, 35µA IQ, 400mA rated, 6-pin WSON (2.0×2.0mm) | Lower max output current (400mA vs. 500mA); higher switching frequency increases sensitivity to layout parasitics. | Select when 3MHz operation is preferred for smallest inductor size and board area is more constrained than current capability. |
| RT8059GJ6 | 1.9V fixed output, 2MHz switching, 25µA IQ, 500mA rated, 6-pin SOT-563 (2.1×1.6mm) | Slightly smaller IQ but uses SOT-563 package with higher θJA (360°C/W); no voltage-positioning architecture. | Select when lowest possible quiescent current is primary, and thermal headroom permits higher junction temperature rise. |
Compared with TPS62231DRYT and RT8059GJ6, MAX8640YEXT19+T provides superior transient response due to voltage-positioning feedback, higher guaranteed output current, and proven SC70 thermal performance-making it optimal for high-reliability portable systems where load-step stability and long-term consistency are critical.
Availability
MAX8640YEXT19+T is available at Aetrix Electronics and suitable for microprocessor core power, I/O power, cell phone baseband supplies, portable medical sensor hubs, and other space-constrained applications requiring stable component supply, consistent parametric performance, and long-lifecycle availability.
Supply support for MAX8640YEXT19+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 is a semiconductor company specializing in analog and mixed-signal ICs for power management, data conversion, interface, and RF applications, serving 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-emphasizing minimal external component count, low quiescent current, and robust transient behavior without sacrificing output accuracy.
FAQ
What is the factory-preset output voltage of MAX8640YEXT19+T?
The MAX8640YEXT19+T has a factory-preset output voltage of 1.9V with ±1% initial accuracy over temperature. This fixed output eliminates the need for external feedback resistors and ensures consistent regulation across production units without trimming. The 1.9V setting is confirmed in the Selector Guide table and matches the top-mark code "ACH" listed in the Ordering Information section of the datasheet.
Does MAX8640YEXT19+T support shutdown functionality, and what is the minimum SHDN pulse width?
Yes, MAX8640YEXT19+T supports active-low shutdown via the SHDN pin. A logic-low signal ≥10µs in duration is required after VIN rises above the undervoltage lockout threshold (2.6V) to properly reset internal logic. In shutdown mode, MAX8640YEXT19+T draws only 0.01µA typical supply current and places the LX node in high-impedance state, isolating the inductor from both IN and GND.
What external components are required for stable operation of MAX8640YEXT19+T?
MAX8640YEXT19+T requires three external components for basic operation: a 2.2µH power inductor, a 4.7µF ceramic output capacitor (X5R/X7R), and a 2.2µF ceramic input capacitor. The Selector Guide explicitly lists these values for MAX8640YEXT19+T. No feedback resistors are needed due to factory-preset 1.9V output, and no external Schottky diode is required thanks to internal synchronous rectification.
How does the voltage-positioning architecture of MAX8640YEXT19+T improve load-transient performance?
The voltage-positioning architecture of MAX8640YEXT19+T samples the LX node instead of the OUT pin, removing phase lag caused by output capacitor impedance. This yields load regulation defined by ΔVOUT = ILOAD × RDCR(L), which cuts peak-to-peak output-voltage excursions in half compared to conventional buck regulators. As shown in Typical Operating Characteristics Figure toc11/toc12, this results in <15mV overshoot during 5mA→250mA→5mA transients at 1.9V output.
Is MAX8640YEXT19+T compatible with 2.7V input, and what is its UVLO threshold?
Yes, MAX8640YEXT19+T operates across a 2.7V to 5.5V input range. Its undervoltage lockout (UVLO) threshold is 2.6V nominal with 100mV hysteresis-meaning the device enables when VIN rises above 2.70V and disables when VIN falls below 2.44V. This ensures reliable startup from single-cell Li+ batteries (nominal 3.6V, discharged to ~2.8V) and alkaline sources without premature dropout.
MAX8640YEXT19+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):
- 1.9V
- 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
MAX8640YEXT19+T FAQ
1.How can I place an order for MAX8640YEXT19+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640YEXT19+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 MAX8640YEXT19+T reliable?
The price and inventory of MAX8640YEXT19+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640YEXT19+T is usually 5 days.
3.What payment methods are accepted for MAX8640YEXT19+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640YEXT19+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640YEXT19+T?
MAX8640YEXT19+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640YEXT19+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 MAX8640YEXT19+T?
For technical support, including MAX8640YEXT19+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640YEXT19+T requirements.
6.How does Aetrix verify that MAX8640YEXT19+T is sourced from the original manufacturer or authorized distributors?
All MAX8640YEXT19+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 MAX8640YEXT19+T meets industry standards.
7.What is the process for return or replacement of MAX8640YEXT19+T?
All MAX8640YEXT19+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640YEXT19+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 MAX8640YEXT19+T part is unused and in its original packaging.
Return procedure for MAX8640YEXT19+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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