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Analog Devices Inc./Maxim Integrated MAX8640YEXT13+T
- Part No.:
- MAX8640YEXT13+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
MAX8640YEXT13+T.pdf
- Description:
- IC REG BUCK 1.3V 500MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,905
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Product details
Overview
MAX8640YEXT13+T from Maxim Integrated is a synchronous step-down DC-DC converter optimized for space-constrained portable applications. It delivers up to 500mA output current at a factory-preset 1.3V, operates with 2.7V–5.5V input, switches at up to 1.9MHz, and achieves ±1% initial output voltage accuracy. Its role is core or I/O power regulation in handheld devices requiring low quiescent current (28µA) and minimal external components.
For engineers reviewing the MAX8640YEXT13+T datasheet, MAX8640YEXT13+T pinout, MAX8640YEXT13+T application, or MAX8640YEXT13+T equivalent, key selection criteria include guaranteed 500mA load capability, SC70 package footprint (2.0mm × 2.1mm), ultrasonic skip mode down to 1mA, voltage-positioning load regulation, and compatibility with 2.2µH/4.7µF external component set.
Technical Context
The MAX8640YEXT13+T implements a proprietary hysteretic PWM control scheme that dynamically balances switching frequency and efficiency. It operates at up to 1.9MHz (per Selector Guide), enabling use of small 2.2µH inductors and 4.7µF ceramic output capacitors while maintaining low output ripple across all loads.
Its voltage-positioning feedback architecture samples the LX node to eliminate phase lag from the output capacitor, yielding load regulation equal to inductor DCR × load current. This design reduces transient overshoot by ~50% versus conventional buck converters and supports fast line/load-transient response without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-preset 1.3V ±1% initial accuracy - eliminates external resistor divider and ensures stable core/I/O rail without calibration. |
| Max Output Current | 500mA guaranteed - supports microprocessor cores, DSPs, and high-speed I/O interfaces in portable systems. |
| Switching Frequency | Up to 1.9MHz - enables compact 2.2µH inductor and 4.7µF output capacitor, reducing board area vs. lower-frequency alternatives. |
| Quiescent Current | 28µA typical - extends battery life in always-on or low-duty-cycle modes (e.g., standby in cell phones, PDAs). |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li+ (3.0–4.2V), alkaline (up to 4.5V), and regulated 3.3V/5V rails. |
| Shutdown Current | 0.01µA typical - minimizes leakage during system sleep, critical for long-term battery-powered operation. |
| Package | 6-pin SC70 (2.0mm × 2.1mm) - ultra-small footprint suitable for thin mobile PCBs with tight layout constraints. |
Pinout & Package
MAX8640YEXT13+T is housed in a lead-free, RoHS-compliant 6-pin SC70 package (2.0mm × 2.1mm). The package features two ground pins (pins 2 and 5) for low-impedance thermal and signal return paths, and requires direct connection under the IC body per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | LX | Inductor switch node connecting internal p-channel and n-channel MOSFET drains - high-impedance during shutdown; requires short, wide trace routing to minimize EMI. |
| 2, 5 | GND | Ground reference for power and feedback - both pins must be connected together directly under the IC and tied to input/output capacitor grounds. |
| 3 | OUT | Output sense input - internally connected to feedback network; bypassed with ceramic capacitor near pin 3 and pin 2 for stability and low noise. |
| 4 | SHDN | Active-low enable input - 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 (2.7V–5.5V) - bypassed with ceramic capacitor near pin 6 and pin 5 to suppress switching noise and reduce input current peaks. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronous rectification | Replaces external Schottky diode - improves efficiency by >15% at medium loads and eliminates diode forward-voltage drop and associated heat. |
| Ultrasonic skip mode | Maintains switching above 20kHz down to 1mA load - prevents audible noise in audio-sensitive applications like MP3 players and smartphones. |
| Fast soft-start | Eliminates inrush current at startup - reduces required input capacitance and avoids voltage droop on weak sources (e.g., coin cells, Li+ batteries). |
| Voltage-positioning load regulation | Load regulation = inductor DCR × ILOAD - cuts peak-to-peak output excursions in half during load transients vs. standard buck topologies. |
| Proprietary hysteretic PWM control | No external compensation needed - simplifies design, reduces BOM count, and ensures loop stability with small ceramic capacitors only. |
Applications
| Smartphone Core Power | Digital Camera I/O Supply |
|---|---|
|
Use Scenario: Powers ARM Cortex-A series application processor cores in slim smartphone designs where PCB real estate is constrained. IC Role / Device Role / Timing Role: Primary 1.3V core regulator delivering up to 500mA with fast load-transient response to handle burst-mode CPU activity. Use Value: Voltage-positioning regulation reduces output voltage deviation to <±15mV during 5mA→500mA transients, preventing processor brownouts. |
Use Scenario: Supplies I/O voltage for CMOS image sensor interfaces and SD card controllers in digital still cameras (DSCs). IC Role / Device Role / Timing Role: Stable 1.3V rail generator supporting high-speed parallel data transfers between sensor and baseband IC. Use Value: 1.9MHz switching allows use of 2.2µH/4.7µF components - saves >30% board area versus 500kHz solutions while maintaining <10mV ripple. |
| Bluetooth Headset Audio Codec | PDA Application Processor Rail |
|
Use Scenario: Powers low-noise audio codec and Bluetooth radio subsystems in compact wireless headsets. IC Role / Device Role / Timing Role: Low-quiescent-current (28µA) DC-DC converter operating in ultrasonic skip mode during standby. Use Value: Skip mode remains ultrasonic (<20kHz) down to 1mA load - eliminates audible switching noise in sensitive audio signal paths. |
Use Scenario: Delivers regulated 1.3V to ARM9-based application processors in legacy PDAs with limited battery capacity. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter supporting dynamic voltage scaling during varying workload states. Use Value: Internal synchronous rectification achieves >92% efficiency at 300mA (VIN=3.6V), extending runtime by >20% vs. diode-based alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | Fixed 1.3V output, 3MHz switching, 400mA max output, 6-pin WSON (2mm × 2mm) | Lower max current (400mA); higher switching frequency enables smaller inductor but increases switching losses at heavy loads | Select when board space is more critical than peak current capability and input voltage stays ≤4.5V. |
| RT8059GJ6 | Adjustable output (0.6V–3.3V), 2MHz switching, 500mA max, 6-pin SOT-563 (1.6mm × 1.6mm) | Requires external feedback resistors; smaller package but no factory preset - adds BOM and layout complexity | Select when adjustable output voltage is required and design can accommodate resistor placement and tolerance stack-up. |
Compared with TPS62231DRVR and RT8059GJ6, the MAX8640YEXT13+T provides guaranteed 500mA delivery at 1.3V with zero external feedback components, optimized voltage-positioning regulation for transient immunity, and validated 2.2µH/4.7µF component set - making it ideal for production-ready, space-constrained portable designs where BOM simplicity and reliability are prioritized.
Availability
MAX8640YEXT13+T is available at Aetrix Electronics and suitable for smartphone core power, digital camera I/O supply, and Bluetooth headset audio codec applications requiring stable component supply, consistent factory-preset voltage, and long-term lifecycle support.
Supply support for MAX8640YEXT13+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/MAX8640Z product line was designed specifically for ultra-compact, battery-powered portable electronics - emphasizing minimal external components, low quiescent current, and robust transient performance in sub-3mm² footprints.
FAQ
What is the factory-preset output voltage of the MAX8640YEXT13+T?
The MAX8640YEXT13+T has a factory-preset output voltage of 1.3V with ±1% initial accuracy over temperature. This fixed output eliminates the need for external feedback resistors, simplifying layout and improving long-term stability. The 1.3V rail is commonly used for microprocessor cores and high-speed I/O interfaces in portable devices.
Does the MAX8640YEXT13+T require external compensation components?
No, the MAX8640YEXT13+T does not require external compensation components. Its proprietary hysteretic PWM control scheme and voltage-positioning feedback architecture ensure inherent loop stability with only a 2.2µH inductor and 4.7µF ceramic output capacitor. This eliminates compensation networks and reduces design risk in space-constrained layouts.
What package type and dimensions does the MAX8640YEXT13+T use?
The MAX8640YEXT13+T uses a 6-pin SC70 package measuring 2.0mm × 2.1mm with 0.65mm pitch. It is lead-free and RoHS-compliant (denoted by the "+T" suffix). The package includes two dedicated GND pins (pins 2 and 5) that must be connected together directly under the IC body for optimal thermal and electrical performance.
How does the MAX8640YEXT13+T manage light-load efficiency?
The MAX8640YEXT13+T automatically enters ultrasonic skip mode below ~100mA load, reducing typical quiescent current to 28µA. This mode maintains switching frequency above 20kHz - avoiding audible noise - while minimizing switching losses. At 1mA load, skip-mode frequency remains ultrasonic, preserving audio integrity in headsets and smartphones.
Can the MAX8640YEXT13+T be used with a 1µH inductor?
No - the MAX8640YEXT13+T is a MAX8640Y variant optimized for 2.2µH inductors and 4.7µF output capacitance (per Selector Guide). Using a 1µH inductor is specified only for MAX8640Z variants (e.g., MAX8640ZEXT13+T), which switch at up to 3.7MHz. Substituting a 1µH inductor with MAX8640YEXT13+T may cause instability, excessive ripple, or current-limit activation.
MAX8640YEXT13+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):
- 1.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 1.9MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
MAX8640YEXT13+T FAQ
1.How can I place an order for MAX8640YEXT13+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640YEXT13+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 MAX8640YEXT13+T reliable?
The price and inventory of MAX8640YEXT13+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640YEXT13+T is usually 5 days.
3.What payment methods are accepted for MAX8640YEXT13+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640YEXT13+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640YEXT13+T?
MAX8640YEXT13+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640YEXT13+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 MAX8640YEXT13+T?
For technical support, including MAX8640YEXT13+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640YEXT13+T requirements.
6.How does Aetrix verify that MAX8640YEXT13+T is sourced from the original manufacturer or authorized distributors?
All MAX8640YEXT13+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 MAX8640YEXT13+T meets industry standards.
7.What is the process for return or replacement of MAX8640YEXT13+T?
All MAX8640YEXT13+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640YEXT13+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 MAX8640YEXT13+T part is unused and in its original packaging.
Return procedure for MAX8640YEXT13+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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