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Analog Devices Inc./Maxim Integrated MAX8640YEXT08+T
- Part No.:
- MAX8640YEXT08+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
MAX8640YEXT08+T.pdf
- Description:
- IC REG BUCK 0.8V 500MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,557
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Product details
Overview
MAX8640YEXT08+T from Maxim Integrated is a 500mA, 2MHz synchronous step-down DC-DC converter in a 6-pin SC70 package, factory preset to 0.8V output, optimized for space-constrained portable electronics requiring low quiescent current (28µA), high efficiency, and ultrasonic skip-mode operation down to 1mA loads.
For engineers reviewing the MAX8640YEXT08+T datasheet, MAX8640YEXT08+T pinout, MAX8640YEXT08+T application, or MAX8640YEXT08+T equivalent, this page delivers verified technical context, exact pin functions, voltage-positioning load regulation behavior, and real-world alternative selection guidance for microprocessor core and I/O power designs.
Technical Context
The MAX8640YEXT08+T implements a proprietary hysteretic PWM control scheme with fixed 2MHz switching frequency, enabling fast transient response and stable regulation using only a 2.2µH inductor and 10µF ceramic output capacitor. Its voltage-positioning feedback architecture samples the LX node to eliminate phase lag, yielding load regulation directly proportional to inductor DCR.
Internal synchronous rectification replaces external Schottky diodes, while integrated soft-start eliminates inrush current and thermal shutdown protects at +160°C with 20°C hysteresis. Shutdown mode reduces supply current to 0.01µA typical, with SHDN logic input requiring ≥10µs low pulse after VIN exceeds UVLO threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory preset 0.8V ±1% initial accuracy - eliminates external feedback resistors and ensures precise core rail generation. |
| Switching Frequency | Fixed 2MHz - enables use of small 2.2µH inductors and supports ultrasonic skip-mode operation down to 1mA loads. |
| Max Output Current | 500mA guaranteed - sufficient for low-power microprocessor cores and peripheral I/O rails in handheld devices. |
| Quiescent Current | 28µA typical - minimizes battery drain in always-on or standby states without compromising startup time. |
| 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 system rails. |
| Load Regulation | Voltage positioning: ΔVOUT = ILOAD × RDCR(L1) - reduces load-transient overshoot by ~50% vs. conventional buck converters. |
| Shutdown Current | 0.01µA typical - enables true zero-power disable for system-level power gating. |
Pinout & Package
Package: 6-pin SC70 (2.0mm × 2.1mm), lead-free/RoHS-compliant, thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | LX | Switch node connecting internal p-channel and n-channel MOSFET drains - requires short, low-inductance routing 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 coupling and ensure stability. |
| 3 | OUT | Output sense input - internally connected to feedback network; bypassed with ceramic capacitor adjacent to pin 2 (GND) for loop stability. |
| 4 | SHDN | Active-low enable input - logic-high enables regulation; requires ≥10µs low pulse after VIN rises above UVLO (2.6V typ) to reset internal logic. |
| 6 | IN | Power input (2.7–5.5V) - bypassed with ceramic capacitor near pin 5 (GND); supplies internal circuitry and high-side switch. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-positioning feedback | Uses LX node sampling to remove output-capacitor phase lag - enables stable loop with tiny ceramic capacitors and halves load-transient voltage excursions. |
| Ultrasonic skip mode | Operates >20kHz down to 1mA loads - eliminates audible noise while maintaining 28µA quiescent current and fast wake-up response. |
| Integrated synchronous rectification | Replaces external Schottky diode - improves full-load efficiency by ~8–12% and reduces board area and thermal stress. |
| Internal soft-start | Eliminates inrush current at startup - reduces required input capacitance and prevents brownout on high-impedance sources like coin cells. |
| Factory preset output | 0.8V fixed with ±1% initial accuracy - removes resistor divider layout, tolerance stack-up, and calibration overhead for core power rails. |
Applications
| Microprocessor Core Power | I/O Power Supply |
|---|---|
|
Use Scenario: Powering ARM Cortex-M0/M3 or RISC-V MCU cores requiring tightly regulated 0.8V rails with fast load transients. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 0.8V at up to 500mA with voltage-positioning load regulation. Use Value: Reduces peak-to-peak output voltage excursion by ~50% during 10mA→500mA load steps, minimizing core voltage droop and timing margin risk. |
Use Scenario: Supplying 0.8V I/O banks for FPGAs or ASICs with dynamic current draw in portable instrumentation. IC Role / Device Role / Timing Role: Compact, low-noise DC-DC source replacing LDOs where efficiency and thermal density are critical. Use Value: Enables use of 2.2µH/10µF external components - cuts solution size by >40% vs. comparable 3MHz converters requiring 1µH/2.2µF. |
| Cell Phone Baseband Power | Wearable Sensor Hub Power |
|
Use Scenario: Providing 0.8V supply to cellular baseband processors during burst transmission modes with rapid current changes. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter operating in ultrasonic skip mode during idle periods. Use Value: Maintains 28µA quiescent current and <10µs wake-up latency - extends battery life without sacrificing transient performance. |
Use Scenario: Powering ultra-low-power sensor fusion hubs (accelerometer + gyro + MCU) in hearables and fitness trackers. IC Role / Device Role / Timing Role: Space-optimized 0.8V regulator in 2.0mm × 2.1mm SC70 package supporting intermittent 500mA peak loads. Use Value: Fits within 3.5mm² PCB footprint including inductor and capacitors - meets strict mechanical constraints of sub-gram wearable modules. |
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 | 3MHz fixed-frequency, 0.9V preset, 400mA rated, 6-pin WSON (2.0 × 2.0mm) | Lower max current and no voltage-positioning feedback - less effective at suppressing load-transient overshoot. | Choose when 400mA suffices and board space allows slightly larger inductor (1.5µH minimum). |
| RT8059ZSP | 1.5MHz, adjustable output (0.6–3.3V), 600mA rated, 6-pin SOT-563 (2.1 × 1.6mm) | Requires external feedback resistors and lacks ultrasonic skip mode - introduces audible noise below 10mA loads. | Choose when adjustable output voltage is needed and acoustic noise is not a constraint. |
Compared with TPS62231DRYT and RT8059ZSP, the MAX8640YEXT08+T delivers superior load-transient suppression via voltage-positioning feedback, maintains ultrasonic operation down to 1mA, and guarantees 500mA output without derating - making it optimal for space- and noise-sensitive 0.8V core power applications.
Availability
MAX8640YEXT08+T is available at Aetrix Electronics and suitable for microprocessor core power, I/O power, and wearable sensor hub designs requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for MAX8640YEXT08+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 series targets ultra-compact, high-efficiency DC-DC conversion in battery-powered portable electronics - emphasizing minimal external component count, low quiescent current, and robust transient response in sub-3mm² footprints.
FAQ
What is the exact output voltage and accuracy of the MAX8640YEXT08+T?
The MAX8640YEXT08+T is factory preset to 0.8V with ±1% initial accuracy at TA = +25°C and ±2% over the full -40°C to +85°C operating temperature range. This fixed output eliminates external feedback resistors and ensures tight regulation without calibration, making it ideal for low-voltage microprocessor core rails where precision is critical.
Does the MAX8640YEXT08+T support ultrasonic operation at light loads?
Yes, the MAX8640YEXT08+T enters ultrasonic skip mode automatically below ~100mA loads, maintaining switching frequencies above 20kHz down to 1mA typical. This prevents audible noise in sensitive audio or wearable applications while retaining 28µA quiescent current and fast wake-up response - a key differentiator from standard PFM-mode converters.
What external components are required for stable operation of the MAX8640YEXT08+T?
The MAX8640YEXT08+T requires only three external components: a 2.2µH inductor (DCR 75–150mΩ recommended), a 10µF ceramic output capacitor (X5R/X7R), and a 2.2µF ceramic input capacitor. The voltage-positioning feedback architecture eliminates the need for compensation networks or external feedback resistors, reducing BOM count and layout complexity.
How does the voltage-positioning load regulation of the MAX8640YEXT08+T improve transient response?
The MAX8640YEXT08+T samples the LX node instead of the OUT pin for feedback, removing phase lag introduced by output capacitance. This yields load regulation ΔVOUT = ILOAD × RDCR(L1), which cuts peak-to-peak output voltage excursions by approximately 50% during rapid load steps (e.g., 10mA → 500mA) compared to conventional buck regulators - enhancing timing margin in digital systems.
What is the recommended PCB layout practice for the MAX8640YEXT08+T's GND pins?
The MAX8640YEXT08+T has two dedicated GND pins (pins 2 and 5) that must be connected together directly beneath the IC using a low-inductance copper pour, then tied to the grounds of both input and output capacitors. This star-ground configuration minimizes ground bounce, prevents regulation errors, and ensures stable operation - especially critical given the 2MHz switching frequency and high peak currents.
MAX8640YEXT08+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):
- 0.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
MAX8640YEXT08+T FAQ
1.How can I place an order for MAX8640YEXT08+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640YEXT08+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 MAX8640YEXT08+T reliable?
The price and inventory of MAX8640YEXT08+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640YEXT08+T is usually 5 days.
3.What payment methods are accepted for MAX8640YEXT08+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640YEXT08+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640YEXT08+T?
MAX8640YEXT08+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640YEXT08+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 MAX8640YEXT08+T?
For technical support, including MAX8640YEXT08+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640YEXT08+T requirements.
6.How does Aetrix verify that MAX8640YEXT08+T is sourced from the original manufacturer or authorized distributors?
All MAX8640YEXT08+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 MAX8640YEXT08+T meets industry standards.
7.What is the process for return or replacement of MAX8640YEXT08+T?
All MAX8640YEXT08+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640YEXT08+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 MAX8640YEXT08+T part is unused and in its original packaging.
Return procedure for MAX8640YEXT08+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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