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Analog Devices Inc./Maxim Integrated MAX8640ZELT12+T
- Part No.:
- MAX8640ZELT12+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX8640ZELT12+T.pdf
- Description:
- IC REG BUCK 1.2V 500MA 6UDFN
- Quantity:
- Payment:
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Inventory:2,953
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Product details
Overview
MAX8640ZELT12+T from Maxim Integrated is a synchronous step-down DC-DC converter optimized for space-constrained portable applications, delivering 500mA output at factory-preset 1.2V with ±1% initial accuracy, 4MHz switching frequency, and 28µA quiescent current. It integrates p-channel and n-channel MOSFETs, supports 2.7V–5.5V input, and uses a 1µH inductor and 2.2µF ceramic output capacitor.
For engineers reviewing the MAX8640ZELT12+T datasheet, MAX8640ZELT12+T pinout, MAX8640ZELT12+T application, or MAX8640ZELT12+T equivalent, key selection criteria include ultrasonic pulse-skipping mode down to 1mA loads, voltage-positioning load regulation, fast line/load transient response, and µDFN (1.5mm × 1.0mm) package compatibility with high-density PCB layouts.
Technical Context
The MAX8640ZELT12+T employs a proprietary hysteretic PWM control scheme that enables fixed-frequency operation up to 4MHz while maintaining low output ripple across all load conditions. Its voltage-positioning feedback architecture samples the LX node directly, eliminating phase lag from the output capacitor and enabling stable loop performance with minimal ceramic capacitance.
This architecture yields load regulation equal to the inductor's DC resistance multiplied by load current-enabling predictable voltage droop and halving peak-to-peak output excursions during transients. Internal synchronous rectification replaces external Schottky diodes, and fast soft-start eliminates inrush current without requiring external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-preset 1.2V with ±1% initial accuracy at TA = +25°C - eliminates external resistor divider and ensures tight regulation for core/I/O rails. |
| Switching Frequency | Up to 3.6MHz (typical for MAX8640ZELT12+T) - enables use of 1µH inductor and 2.2µF output capacitor for ultra-compact BOM. |
| Max Output Current | 500mA guaranteed over -40°C to +85°C - supports microprocessor core or I/O power in handheld devices without thermal derating. |
| Quiescent Current | 28µA typical at no load - 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+ (2.7–4.2V), alkaline, or regulated 3.3V/5V supplies. |
| Shutdown Current | 0.01µA typical - reduces system standby power to negligible levels when disabled via SHDN pin. |
| Load Transient Response | Ultra-fast recovery from 5mA ↔ 500mA steps - limits output deviation to <100mV with minimal external compensation. |
Pinout & Package
MAX8640ZELT12+T is housed in a lead-free, RoHS-compliant 6-pin µDFN package measuring 1.5mm × 1.0mm × 0.5mm, optimized for high-density portable PCBs. The package features exposed thermal pad for enhanced power dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LX) | Inductor switch node | High-current connection to internal p-channel and n-channel MOSFET drains; requires short, wide trace routing to minimize EMI and voltage spikes. |
| 2, 5 (GND) | Ground terminals | Dual GND pins must be connected together directly under IC and tied to low-impedance ground plane to ensure stable regulation and thermal performance. |
| 3 (OUT) | Output voltage sense | Internally connected to feedback network; bypass with ceramic capacitor placed adjacent to pin 3 and pin 2 (GND) for loop stability. |
| 4 (SHDN) | Active-low enable | Logic-low ≥10µs after VIN exceeds UVLO (2.6V) resets internal logic; drives device into 0.01µA shutdown state with high-impedance LX. |
| 6 (IN) | Power input | Accepts 2.7V–5.5V supply; requires local 2.2µF ceramic bypass capacitor placed adjacent to pin 6 and pin 5 (GND) to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-positioning load regulation | Output droop scales linearly with load current × inductor DCR - enables predictable, overshoot-minimized transient behavior without complex compensation. |
| Ultrasonic pulse-skipping mode | Maintains >20kHz switching frequency down to 1mA load - avoids audible noise while sustaining 28µA quiescent current and low ripple. |
| Internal synchronous rectification | Eliminates need for external Schottky diode - reduces component count, board area, and conduction losses versus asynchronous buck topologies. |
| Fast soft-start | Internally controlled ramp eliminates inrush current - allows direct connection to high-impedance sources like coin cells without input capacitor oversizing. |
| Stable operation with tiny ceramics | Validated with 1µH inductor and 2.2µF X5R/X7R output capacitor - enables full functionality in <1.5mm² footprint including passive components. |
Applications
| Microprocessor Core Power | I/O Supply Regulation |
|---|---|
Use Scenario: Powering ARM Cortex-M or RISC-V MCU cores in wearables and IoT edge nodes with strict size and battery-life constraints. IC Role / Device Role / Timing Role: Primary 1.2V core regulator delivering up to 500mA with fast load-transient response to handle CPU burst activity. Use Value: Voltage-positioning regulation minimizes VDD droop during 0→500mA transitions, preventing core clock instability or brownout resets. |
Use Scenario: Generating clean 1.2V or 1.8V I/O rails for memory interfaces (SPI, I²C) and sensor hubs in smartphones and PDAs. IC Role / Device Role / Timing Role: Low-noise, high-PSRR point-of-load regulator decoupled from noisy system rails. Use Value: 4MHz switching and internal sync rectification reduce output ripple to <10mVPP, ensuring signal integrity on high-speed digital buses. |
| Cell Phone Baseband Power | Portable Medical Sensor Power |
Use Scenario: Supplying 1.2V to LTE/5G baseband processors in ultra-thin mobile handsets where PCB real estate is at premium. IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter operating from single-cell Li+ battery (3.0–4.2V). Use Value: µDFN package (1.5mm × 1.0mm) plus 1µH/2.2µF BOM fits within 2.5mm² total footprint - critical for stacked-flex designs. |
Use Scenario: Powering low-power biosensors (ECG, SpO₂) in FDA-cleared wearable patches requiring long shelf life and zero audible noise. IC Role / Device Role / Timing Role: Always-on 1.2V supply with 28µA quiescent current and ultrasonic skip mode. Use Value: No audible coil whine below 20kHz and sub-µA shutdown current extend 10-year shelf life in sealed medical packaging. |
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; 1.2V fixed output; 3.6MHz switching; 400mA max output; 21µA IQ; 6-pin WSON (1.5mm × 1.5mm) | Lower max output current (400mA vs. 500mA); larger package footprint (1.5mm² vs. 1.5mm × 1.0mm = 1.5mm² but taller profile); no voltage-positioning regulation | Select when lower IQ or TI ecosystem support is prioritized over load-transient performance and minimum footprint. |
| RT7295BGJ5 | 2.5V–5.5V input; 1.2V fixed output; 2MHz switching; 500mA max output; 35µA IQ; 6-pin SOT-563 (1.6mm × 1.6mm) | Slower switching (2MHz vs. 3.6MHz) requires larger 2.2µH inductor; higher IQ; larger package; no ultrasonic skip mode | Select when cost sensitivity outweighs size constraints and audible noise is acceptable in end application. |
Compared with TPS62231DRYR and RT7295BGJ5, the MAX8640ZELT12+T delivers superior transient response due to voltage-positioning architecture, smaller footprint via µDFN, and guaranteed 500mA output at 1.2V - making it optimal for next-generation ultra-compact portable electronics where regulation precision and board area are critical.
Availability
MAX8640ZELT12+T is available at Aetrix Electronics and suitable for microprocessor core power, I/O supply regulation, cell phone baseband power, and portable medical sensor power requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for MAX8640ZELT12+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/MAX8640Z product line was designed specifically for space-constrained portable electronics requiring high efficiency, ultralow quiescent current, and minimal external component count - targeting smartphones, wearables, and medical sensors.
FAQ
What is the exact output voltage and accuracy of the MAX8640ZELT12+T?
The MAX8640ZELT12+T is factory-preset to deliver 1.2V output with ±1% initial accuracy at +25°C and ±2% over the full -40°C to +85°C operating temperature range. This tight tolerance eliminates the need for external feedback resistors and ensures reliable core voltage compliance in microprocessor and SoC applications without calibration.
Does the MAX8640ZELT12+T require external compensation components?
No, the MAX8640ZELT12+T does not require external compensation components. Its proprietary hysteretic PWM control and voltage-positioning feedback architecture achieve inherent loop stability with only a 1µH inductor and 2.2µF ceramic output capacitor - simplifying design and reducing BOM count.
What package type and dimensions does the MAX8640ZELT12+T use?
The MAX8640ZELT12+T uses a lead-free, RoHS-compliant 6-pin µDFN package measuring 1.5mm × 1.0mm × 0.5mm with an exposed thermal pad. This ultra-compact footprint is validated for high-density portable PCB layouts and supports reflow soldering per JEDEC J-STD-020 standards.
How does the MAX8640ZELT12+T manage light-load efficiency?
The MAX8640ZELT12+T automatically enters ultrasonic pulse-skipping mode below ~100mA load, maintaining switching frequency above 20kHz to avoid audible noise while achieving 28µA typical quiescent current. This preserves battery runtime in standby and intermittent-use portable applications without sacrificing regulation quality.
Can the MAX8640ZELT12+T operate from a single-cell Li+ battery?
Yes, the MAX8640ZELT12+T operates across 2.7V to 5.5V input, fully covering the discharge curve of a single-cell Li+ battery (2.7V–4.2V). Its 2.6V undervoltage lockout (UVLO) with 100mV hysteresis ensures reliable startup and shutdown behavior as the battery depletes, protecting downstream circuitry.
MAX8640ZELT12+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX8640ZELT12+T FAQ
1.How can I place an order for MAX8640ZELT12+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640ZELT12+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 MAX8640ZELT12+T reliable?
The price and inventory of MAX8640ZELT12+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640ZELT12+T is usually 5 days.
3.What payment methods are accepted for MAX8640ZELT12+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640ZELT12+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640ZELT12+T?
MAX8640ZELT12+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640ZELT12+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 MAX8640ZELT12+T?
For technical support, including MAX8640ZELT12+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640ZELT12+T requirements.
6.How does Aetrix verify that MAX8640ZELT12+T is sourced from the original manufacturer or authorized distributors?
All MAX8640ZELT12+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 MAX8640ZELT12+T meets industry standards.
7.What is the process for return or replacement of MAX8640ZELT12+T?
All MAX8640ZELT12+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640ZELT12+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 MAX8640ZELT12+T part is unused and in its original packaging.
Return procedure for MAX8640ZELT12+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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