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Analog Devices Inc./Maxim Integrated MAX8640ZEXT15+T
- Part No.:
- MAX8640ZEXT15+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
MAX8640ZEXT15+T.pdf
- Description:
- IC REG BUCK 1.5V 500MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,018
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Product details
Overview
MAX8640ZEXT15+T from Maxim Integrated is a synchronous step-down DC-DC converter optimized for space-constrained portable applications, delivering 500mA output at factory-preset 1.5V with up to 4MHz switching frequency, enabling use of a 1µH inductor and 2.2µF ceramic output capacitor. It features 28µA quiescent current, ±1% initial output accuracy, and internal synchronous rectification for high efficiency without external Schottky diodes.
For engineers reviewing the MAX8640ZEXT15+T datasheet, MAX8640ZEXT15+T pinout, MAX8640ZEXT15+T application, or MAX8640ZEXT15+T equivalent, key selection considerations include ultrasonic pulse-skipping mode down to 1mA loads, voltage-positioning load regulation (equal to inductor DCR × ILOAD), fast line/load transient response, and SC70 package compatibility with tight PCB area budgets.
Technical Context
The MAX8640ZEXT15+T implements a proprietary hysteretic PWM control scheme that dynamically adjusts switching frequency-up to 3.9MHz per Selector Guide-to balance efficiency and component size. Its voltage-positioning feedback architecture samples the LX node directly, eliminating phase lag from output capacitance and enabling stable loop operation with ultra-small ceramic capacitors.
This architecture yields load regulation defined by inductor DC resistance (RL) rather than traditional error-amplifier-based schemes, reducing peak-to-peak output-voltage excursions during transients by ~50%. Internal p-channel and n-channel MOSFETs provide synchronous rectification, while fast soft-start eliminates input inrush current and supports direct Li+-cell or alkaline battery interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-preset 1.5V (±1% initial accuracy); eliminates external resistor divider and saves board space. |
| Switching Frequency | Up to 3.9MHz (typical); enables 1µH inductor and 2.2µF output capacitor for minimal footprint. |
| Max Output Current | 500mA guaranteed; supports core/I/O power for microprocessors, DSPs, and handheld SoCs. |
| Quiescent Current | 28µA typical; extends battery life in always-on or low-duty-cycle portable systems. |
| Input Voltage Range | 2.7V to 5.5V; compatible with single-cell Li+, Li-polymer, and 3.3V/5V rail inputs. |
| Shutdown Current | 0.01µA typical; reduces system standby power to near-zero when disabled via SHDN pin. |
| Package | 6-pin SC70 (2.0mm × 2.1mm); surface-mount, lead-free, RoHS-compliant, thermally efficient. |
Pinout & Package
MAX8640ZEXT15+T is housed in a 6-pin SC70 package (2.0mm × 2.1mm, 0.95mm height), lead-free and RoHS-compliant. The package features exposed pad thermal enhancement and requires standard reflow soldering profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LX) | Inductor switch node | High-current connection to internal p-channel and n-channel MOSFET drains; must be routed with short, wide trace to minimize EMI and voltage spikes. |
| 2,5 (GND) | Power ground | Dual ground pins; must be connected together directly under IC and tied to input/output capacitor grounds for low-impedance return path. |
| 3 (OUT) | Output voltage sense | Internally connected to feedback network; bypass with ceramic capacitor placed adjacent to pin 3 and pin 2 for stability and ripple suppression. |
| 4 (SHDN) | Active-low enable | Logic input requiring ≥10µs low pulse after VIN exceeds UVLO (2.6V typ) to reset internal logic; enables precise power sequencing. |
| 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 and reduce input current peaks. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-positioning load regulation | Regulation error = ILOAD × inductor DCR; eliminates overshoot/undershoot during load steps and halves peak-to-peak excursion vs. conventional buck regulators. |
| Ultrasonic pulse-skipping mode | Operates >20kHz down to 1mA loads; avoids audible noise while maintaining 28µA quiescent current and low output ripple. |
| Internal synchronous rectification | Replaces external Schottky diode; improves full-load efficiency by ~8–12% and reduces thermal stress on PCB. |
| Fast soft-start | Eliminates input inrush current; allows direct connection to high-impedance sources like coin cells without oversized input capacitors. |
| High-frequency hysteretic PWM | 3.9MHz typical switching; enables smallest possible passive components without compromising transient response or stability. |
Applications
| Microprocessor Core Power | I/O Power Supply |
|---|---|
Use Scenario: Powering ARM Cortex-M4/M7 or RISC-V MCU cores in battery-powered edge sensors. IC Role / Device Role / Timing Role: Primary 1.5V core regulator delivering up to 500mA with sub-10µs load transient recovery. Use Value: Voltage-positioning regulation minimizes VDD droop during burst-mode execution, preventing timing violations and brownouts. |
Use Scenario: Generating 1.5V I/O rail for SDIO, SPI, and GPIO interfaces in compact wearables. IC Role / Device Role / Timing Role: Low-noise, fast-response point-of-load regulator decoupled from main system rail. Use Value: 3.9MHz switching avoids interference with 2.4GHz RF bands; ultrasonic skip mode prevents audible coil whine during idle periods. |
| Smartphone Subsystem Power | Portable Medical Sensor Power |
Use Scenario: Supplying image signal processor (ISP) or audio codec subsystems in mid-tier smartphones. IC Role / Device Role / Timing Role: Secondary buck converter operating from main PMIC rail, enabled via host-controlled SHDN. Use Value: 0.01µA shutdown current ensures zero leakage during deep sleep; SC70 footprint fits within tight camera module PCB real estate. |
Use Scenario: Powering low-power ECG or pulse oximetry analog front-end (AFE) in FDA-cleared wearable monitors. IC Role / Device Role / Timing Role: Precision 1.5V supply with ±1% initial accuracy and low output ripple (<10mVPP) for ADC reference stability. Use Value: Factory-preset output eliminates calibration overhead; 28µA quiescent current extends single-charge battery life beyond 7 days. |
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 |
|---|---|---|---|
| TPS62231DRYR | 2.25V–5.5V input; 1.5V fixed output; 3MHz max switching; 400mA rated; 6-pin WSON (2mm × 2mm). | Limited to 400mA output; lacks voltage-positioning architecture; higher output ripple at light loads. | Choose when lower cost and TI ecosystem support outweigh need for 500mA capability and ultrasonic skip mode. |
| RT8059NGSP | 2.5V–5.5V input; 1.5V fixed output; 2MHz max switching; 500mA rated; 6-pin SOT-563 (1.6mm × 1.6mm). | Slower 2MHz switching requires larger 2.2µH inductor; no factory-preset variants below 1.2V; higher quiescent current (45µA). | Choose when SOT-563 footprint is preferred over SC70 and 2MHz operation suffices for layout constraints. |
Compared with TPS62231DRYR and RT8059NGSP, the MAX8640ZEXT15+T delivers higher output current headroom (500mA), superior light-load efficiency via ultrasonic skip mode, and tighter voltage positioning for dynamic load handling-making it optimal for space- and battery-life-critical portable designs where 1.5V core/I/O rails demand precision and responsiveness.
Availability
MAX8640ZEXT15+T is available at Aetrix Electronics and suitable for microprocessor core power, I/O power, and portable medical sensor applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8640ZEXT15+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, designs precision analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and portable applications.
The MAX8640Y/MAX8640Z product line targets ultra-compact, high-efficiency DC-DC conversion in battery-powered handheld devices-prioritizing minimal external component count, low quiescent current, and fast transient response without sacrificing stability.
FAQ
What is the exact output voltage and tolerance of the MAX8640ZEXT15+T?
The MAX8640ZEXT15+T is factory-preset to deliver 1.5V output 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 consistent regulation without calibration.
Does the MAX8640ZEXT15+T require an external Schottky diode?
No, the MAX8640ZEXT15+T does not require an external Schottky diode because it integrates synchronous rectification using internal n-channel MOSFETs. This design improves full-load efficiency by up to 12% and reduces thermal dissipation compared to asynchronous buck converters.
What is the minimum recommended input voltage for reliable operation of the MAX8640ZEXT15+T?
The MAX8640ZEXT15+T has an undervoltage lockout (UVLO) threshold of 2.6V (typical), with 100mV hysteresis. Reliable operation begins when VIN rises above 2.70V (max UVLO rising threshold), and the specified input range is 2.7V to 5.5V-making it compatible with single-cell Li+ batteries and regulated 3.3V rails.
Can the MAX8640ZEXT15+T operate in pulse-skipping mode at very light loads?
Yes, the MAX8640ZEXT15+T automatically enters ultrasonic pulse-skipping mode below ~100mA load, maintaining switching frequency above 20kHz down to 1mA (typical). This avoids audible noise while sustaining 28µA quiescent current and low output ripple across all load conditions.
What package type and dimensions does the MAX8640ZEXT15+T use?
The MAX8640ZEXT15+T uses a 6-pin SC70 package measuring 2.0mm × 2.1mm × 0.95mm, with lead-free/RoHS-compliant finish and tape-and-reel packaging (denoted by "+T"). Its small footprint and dual GND pins support high-density portable PCB layouts with robust thermal performance.
MAX8640ZEXT15+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):
- 1.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 3.9MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
MAX8640ZEXT15+T FAQ
1.How can I place an order for MAX8640ZEXT15+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640ZEXT15+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 MAX8640ZEXT15+T reliable?
The price and inventory of MAX8640ZEXT15+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640ZEXT15+T is usually 5 days.
3.What payment methods are accepted for MAX8640ZEXT15+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640ZEXT15+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640ZEXT15+T?
MAX8640ZEXT15+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640ZEXT15+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 MAX8640ZEXT15+T?
For technical support, including MAX8640ZEXT15+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640ZEXT15+T requirements.
6.How does Aetrix verify that MAX8640ZEXT15+T is sourced from the original manufacturer or authorized distributors?
All MAX8640ZEXT15+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 MAX8640ZEXT15+T meets industry standards.
7.What is the process for return or replacement of MAX8640ZEXT15+T?
All MAX8640ZEXT15+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640ZEXT15+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 MAX8640ZEXT15+T part is unused and in its original packaging.
Return procedure for MAX8640ZEXT15+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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