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Analog Devices Inc./Maxim Integrated MAX8640YEXT25+T
- Part No.:
- MAX8640YEXT25+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
MAX8640YEXT25+T.pdf
- Description:
- IC REG BUCK 2.5V 500MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,137
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Product details
Overview
MAX8640YEXT25+T from Maxim Integrated is a 500mA, 2MHz synchronous step-down DC-DC converter in a 6-pin SC70 package, delivering a factory-preset 2.5V output with ±1% initial accuracy and 28µA quiescent current. It employs proprietary hysteretic PWM control, internal synchronous rectification, and voltage-positioning load regulation for microprocessor core and I/O power in space-constrained handheld devices.
For engineers reviewing the MAX8640YEXT25+T datasheet, MAX8640YEXT25+T pinout, MAX8640YEXT25+T application, or MAX8640YEXT25+T equivalent, key selection criteria include guaranteed 500mA output at 2.5V, 2.2µH/4.7µF external component requirements, ultrasonic pulse-skipping down to 1mA loads, and SC70 thermal performance (245mW at +70°C).
Technical Context
The MAX8640YEXT25+T uses a proprietary hysteretic PWM control scheme optimized for fast transient response and low output ripple across all loads. Its voltage-positioning feedback architecture samples the LX node directly, eliminating phase lag from the output capacitor and enabling stable operation with only 4.7µF ceramic output capacitance.
This device operates exclusively in the MAX8640Y variant family-switching up to 2MHz (not 4MHz), supporting 2.2µH inductors and 4.7µF output capacitors, and delivering factory-set 2.5V output without external resistors. Shutdown mode reduces supply current to 0.01µA typical while placing LX in high-impedance state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-preset 2.5V with ±1% initial accuracy at +25°C - eliminates external feedback network and ensures precise core/I/O rail compliance. |
| Switching Frequency | Up to 2.0MHz - enables use of compact 2.2µH inductor and minimizes EMI above audible range while balancing efficiency and size. |
| Output Current | Guaranteed 500mA - supports demanding digital loads including DSP cores and high-speed I/O interfaces in portable systems. |
| Quiescent Current | 28µA typical - extends battery life in always-on or low-duty-cycle applications such as standby power domains. |
| 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 design yields load regulation equal to inductor DC resistance × load current - reduces load-transient overshoot by ~50% vs. conventional buck converters. |
| Shutdown Current | 0.01µA typical - enables ultra-low-power system-level power gating without leakage concerns. |
Pinout & Package
MAX8640YEXT25+T is housed in a lead-free, RoHS-compliant 6-pin SC70 package (2.0mm × 2.1mm), optimized for high-density PCB layouts and thermal performance up to 245mW at +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - LX | Inductor connection node | High-impedance during shutdown; connects internal p-channel and n-channel MOSFET drains - requires short, wide trace routing to minimize EMI and switching losses. |
| 2, 5 - GND | Power ground | Two dedicated ground pins must be connected together directly under IC and tied to input/output capacitor grounds - critical for noise immunity and loop stability. |
| 3 - OUT | Output sense and feedback input | Internally connected to voltage-positioning feedback network; bypassed with ceramic capacitor adjacent to pin - enables stable regulation with minimal output capacitance. |
| 4 - SHDN | Active-low enable/shutdown control | Logic-low disables DC-DC and resets internal logic; requires ≥10µs low pulse after VIN exceeds UVLO (2.6V) - supports system-level power sequencing. |
| 6 - IN | Input supply voltage | Accepts 2.7V–5.5V; bypassed with ceramic capacitor near pin - supplies both control circuitry and power switches; low-ESR cap essential for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronous rectification | Replaces external Schottky diode, improving full-load efficiency and eliminating reverse recovery losses - reduces BOM count and thermal stress. |
| Fast soft-start | Eliminates inrush current at startup, reducing input capacitor stress and transients on high-impedance sources like Li+ batteries - enables direct connection to battery without additional current limiting. |
| Ultrasonic pulse-skipping mode | Maintains switching frequency above 20kHz down to 1mA load - prevents audible noise in audio-sensitive applications while preserving low quiescent current. |
| Voltage-positioning load regulation | Feedback derived from LX node removes output capacitor phase lag - allows use of tiny 4.7µF ceramic output cap and halves peak-to-peak voltage excursions during load steps. |
| Factory-preset output | 2.5V output set at wafer level - removes need for external resistor divider, saves board area, and guarantees accuracy without calibration. |
Applications
| Microprocessor Core Power | I/O Interface Power |
|---|---|
Use Scenario: Powering ARM Cortex-M4 core in an ultra-compact wearable sensor node operating from a single Li+ cell. IC Role / Device Role / Timing Role: Primary 2.5V core supply regulator with fast load-transient response to handle burst-mode CPU activity. Use Value: Voltage-positioning regulation limits output deviation to <±15mV during 10mA→500mA load steps - maintains core stability without oversized output capacitance. |
Use Scenario: Supplying 2.5V to SDIO and SPI peripherals in a handheld medical PDA with strict EMI limits. IC Role / Device Role / Timing Role: Dedicated low-noise I/O rail generator using 2MHz switching to stay above sensitive audio bands. Use Value: Ultrasonic skip mode ensures no audible switching artifacts; 28µA quiescent current extends sleep-mode battery life beyond 30 days. |
| Cell Phone Baseband Power | Portable DSC Image Sensor Bias |
Use Scenario: Delivering 2.5V to baseband processor in dual-SIM smartphone with tight PCB real estate constraints. IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter replacing discrete solutions in RF-adjacent power domain. Use Value: SC70 footprint (2.0mm × 2.1mm) saves >40% board area vs. comparable SOT-23 solutions - enables placement near processor die. |
Use Scenario: Biasing CMOS image sensor analog front-end in digital still camera requiring clean, stable 2.5V. IC Role / Device Role / Timing Role: Low-ripple, low-noise power source with fast line-transient response to handle flash charging events. Use Value: <10mVpp output ripple at 500mA and <20µs recovery from 4V→3.5V input transients - prevents image sensor banding or noise coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYT | 2.5V fixed output, 3MHz switching, 35µA IQ, 6-pin WSON (2.0mm × 2.0mm) | Higher switching frequency enables smaller 1µH inductor but increases light-load switching losses; lacks voltage-positioning architecture. | Preferred when board space permits tighter inductor placement and higher-frequency EMI filtering is acceptable. |
| RT8059GJ6 | 2.5V fixed output, 1.5MHz switching, 25µA IQ, 6-pin SOT-563 (2.1mm × 1.6mm) | Lower switching frequency improves heavy-load efficiency but requires larger 4.7µH inductor; no LX-sense feedback or ultrasonic skip mode. | Selected where cost sensitivity outweighs transient performance needs and PCB layout allows larger magnetics. |
Compared with TPS62231DRYT and RT8059GJ6, MAX8640YEXT25+T uniquely combines voltage-positioning load regulation, ultrasonic skip mode, and SC70 thermal performance - making it optimal for space-constrained, battery-powered systems requiring minimal output deviation and silent operation.
Availability
MAX8640YEXT25+T is available at Aetrix Electronics and suitable for microprocessor core power, I/O interface power, and portable imaging sensor bias applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8640YEXT25+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, precision sensing, and secure communications.
The MAX8640Y series belongs to Maxim's ultra-compact DC-DC converter product line, designed specifically for space- and power-constrained portable electronics requiring high efficiency, low noise, and minimal external components.
FAQ
What is the exact output voltage and accuracy of MAX8640YEXT25+T?
The MAX8640YEXT25+T delivers a factory-preset 2.5V output with ±1% initial accuracy at +25°C and ±2% over the full -40°C to +85°C operating range. This specification is guaranteed without external feedback components and is confirmed in the Electrical Characteristics table of the official datasheet (Rev 5, p.2). The 2.5V setting corresponds to top mark ACJ on the SC70 package.
Does MAX8640YEXT25+T support 2MHz switching across its entire input and load range?
Yes, MAX8640YEXT25+T operates up to 2.0MHz across its specified conditions: VIN = 2.7V to 5.5V and load currents up to 500mA. The Selector Guide (p.8) confirms 1.7MHz typical for this variant, and Figure 3 (SWITCHING FREQUENCY vs. LOAD CURRENT) shows sustained 2MHz operation up to 300mA, with slight reduction at full load - consistent with its MAX8640Y family designation.
What external components are required for stable operation of MAX8640YEXT25+T?
MAX8640YEXT25+T requires three external components: a 2.2µH inductor (e.g., Murata LQM31P), a 4.7µF ceramic output capacitor (X5R/X7R dielectric), and a 2.2µF ceramic input capacitor. These values are explicitly listed in the Selector Guide (p.8) for MAX8640YEXT25 and validated in the Typical Operating Circuit (p.2). No feedback resistors are needed due to factory presetting.
How does the voltage-positioning architecture of MAX8640YEXT25+T improve load transient performance?
The MAX8640YEXT25+T samples feedback directly from the LX node instead of the output, removing phase lag introduced by the output capacitor. This enables faster loop response and reduces peak-to-peak output voltage excursions by approximately 50% during load steps - as demonstrated in Figure 11 (LOAD-TRANSIENT RESPONSE) where deviation remains under ±15mV for 10mA→500mA transitions.
Is MAX8640YEXT25+T pin-compatible with other variants in the MAX8640Y/MAX8640Z family?
Yes, all MAX8640Y and MAX8640Z variants share identical 6-pin SC70 and µDFN footprints and pinouts (LX, GND, OUT, SHDN, GND, IN). The MAX8640YEXT25+T uses the same SC70 package (X6S-1) and pin configuration as MAX8640YEXT15+T or MAX8640ZEXT15+T - confirmed in Pin Configurations (p.2) and Package Information (p.10). Functionally, only the output voltage and switching frequency differ between Y/Z variants.
MAX8640YEXT25+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:
- Active
- 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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 1.7MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
MAX8640YEXT25+T FAQ
1.How can I place an order for MAX8640YEXT25+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640YEXT25+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 MAX8640YEXT25+T reliable?
The price and inventory of MAX8640YEXT25+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640YEXT25+T is usually 5 days.
3.What payment methods are accepted for MAX8640YEXT25+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640YEXT25+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640YEXT25+T?
MAX8640YEXT25+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640YEXT25+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 MAX8640YEXT25+T?
For technical support, including MAX8640YEXT25+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640YEXT25+T requirements.
6.How does Aetrix verify that MAX8640YEXT25+T is sourced from the original manufacturer or authorized distributors?
All MAX8640YEXT25+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 MAX8640YEXT25+T meets industry standards.
7.What is the process for return or replacement of MAX8640YEXT25+T?
All MAX8640YEXT25+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640YEXT25+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 MAX8640YEXT25+T part is unused and in its original packaging.
Return procedure for MAX8640YEXT25+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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