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Analog Devices Inc./Maxim Integrated MAX8640ZELT12+
- Part No.:
- MAX8640ZELT12+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WFDFN
- Datasheet:
-
MAX8640ZELT12+.pdf
- Description:
- IC REG BUCK 1.2V 500MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:31,666
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Product details
Overview
MAX8640ZELT12+ 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 1.2V, operates from 2.7V–5.5V input, switches at 3.6MHz, and uses only a 1µH inductor and 2.2µF output capacitor. Its internal synchronous rectification, 28µA quiescent current, and ±1% initial output accuracy make it ideal for powering microprocessor cores in handheld devices.
For engineers reviewing the MAX8640ZELT12+ datasheet, MAX8640ZELT12+ pinout, MAX8640ZELT12+ application, or MAX8640ZELT12+ equivalent, key selection criteria include its 3.6MHz switching frequency enabling ultra-compact filtering, voltage-positioning load regulation tied to inductor DCR, ultrasonic skip mode down to 1mA, fast transient response, and µDFN (1.5mm × 1.0mm) lead-free package compatibility with high-density PCB layouts.
Technical Context
The MAX8640ZELT12+ employs a proprietary hysteretic PWM control scheme that dynamically adjusts switching frequency based on load-maintaining 3.6MHz at full load while enabling ultrasonic pulse-skipping below 100mA. This architecture eliminates external compensation and supports stable regulation with minimal ceramic capacitance.
Voltage-positioning feedback samples the LX node rather than the output, removing phase lag from the output capacitor and yielding load regulation equal to inductor DCR × ILOAD. Combined with internal p-channel/n-channel MOSFETs (RONP = 0.6Ω typ, RONN = 0.35Ω typ), this enables fast line/load transients and reduced output-voltage excursions during dynamic loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory preset 1.2V ±1% initial accuracy - eliminates external resistor divider and ensures precise core rail compliance. |
| Switching Frequency | 3.6MHz - enables use of 1µH inductor and 2.2µF ceramic output capacitor, minimizing solution footprint to <2.5mm². |
| Max Output Current | 500mA guaranteed - supports demanding digital loads including DSP cores and high-speed I/O without thermal derating in µDFN package. |
| Quiescent Current | 28µA typical - extends battery life in always-on subsystems and enables efficient operation down to 1mA loads via ultrasonic skip mode. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li+ (2.7–4.2V), 3.3V rails, and 5V USB-powered systems. |
| Package | 6-pin µDFN (1.5mm × 1.0mm, 0.8mm height) - ultra-small footprint with exposed pad for thermal performance; RoHS-compliant and lead-free. |
| Shutdown Current | 0.1µA typical - reduces system standby power to negligible levels when SHDN is pulled low. |
Pinout & Package
MAX8640ZELT12+ is housed in a 6-pin µDFN package (1.5mm × 1.0mm, 0.8mm height) with exposed thermal pad. Pin 1 is marked by top-side laser etch "NM" per Maxim's ordering guide.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX | Inductor switch node | Connects to internal p-channel and n-channel MOSFET drains; carries high di/dt switching current - requires short, wide trace and direct connection to inductor. |
| GND (pins 2 & 5) | Power ground | Dual ground pins must be connected together under IC and tied directly to input/output capacitor grounds to minimize noise and ensure stability. |
| OUT | Feedback sense input | Internally connected to voltage-positioning network; bypassed with ceramic capacitor near pin to stabilize loop and reduce ripple. |
| SHDN | Active-low enable | Pull low to enter shutdown (0.1µA ICC); tie to IN or logic high for normal operation - no external pull-up required. |
| IN | Input supply | 2.7V–5.5V input; bypassed with ≥2.2µF ceramic capacitor close to pin and GND to suppress switching noise and support soft-start. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-positioning load regulation | Load regulation equals inductor DCR × ILOAD, eliminating output capacitor ESR dependency and halving peak-to-peak voltage excursion during transients. |
| Internal synchronous rectification | Replaces external Schottky diode; reduces conduction loss and improves efficiency by >10% at medium loads versus asynchronous designs. |
| Ultrasonic skip mode | Maintains switching frequency >20kHz down to 1mA load, preventing audible noise while sustaining 28µA quiescent current. |
| Fast soft-start | Eliminates inrush current at startup, reducing required input capacitance and protecting high-impedance sources like coin cells and Li+ batteries. |
| Hysteretic PWM control | No external compensation needed; achieves sub-10µs load-transient recovery and inherent stability with ceramic output capacitors as small as 2.2µF. |
Applications
| Microprocessor Core Power | I/O Power Supply |
|---|---|
Use Scenario: Powering ARM Cortex-M or RISC-V MCU cores in wearable sensors and Bluetooth LE modules where board area is constrained to <100mm². IC Role / Device Role / Timing Role: Primary 1.2V core regulator delivering up to 500mA with fast load-transient response to handle burst-mode CPU activity. Use Value: Voltage-positioning regulation minimizes overshoot/undershoot during 0→300mA transitions, maintaining core stability without oversized output capacitance. | Use Scenario: Supplying 1.2V or 1.8V I/O banks in FPGA-based edge AI accelerators operating from single-cell Li+ input. IC Role / Device Role / Timing Role: Secondary regulated rail decoupled from core supply; handles dynamic I/O switching currents up to 400mA. Use Value: 3.6MHz switching allows compact 1µH/2.2µF filter, freeing PCB area for high-speed signal routing and thermal vias. |
| Cell Phone Application Processor | Portable Medical Monitor |
Use Scenario: Providing 1.2V core voltage to application processors (e.g., Qualcomm Snapdragon variants) in slim smartphones with strict height limits (<0.8mm). IC Role / Device Role / Timing Role: High-efficiency buck converter supporting DVFS scaling across 100mA–500mA load range with minimal thermal rise. Use Value: µDFN package (1.5mm × 1.0mm) and 28µA quiescent current extend standby time and meet mechanical stack-up constraints. | Use Scenario: Powering low-power ADCs, op-amps, and wireless transceivers in FDA-cleared handheld ECG monitors running on AAA alkaline cells. IC Role / Device Role / Timing Role: Primary DC-DC regulator converting 3.0V–4.5V battery output to stable 1.2V rail with low-noise operation critical for analog signal integrity. Use Value: Ultrasonic skip mode prevents audible switching artifacts during sleep mode, while fast line-transient response maintains accuracy during battery voltage sag. |
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 |
|---|---|---|---|
| TPS62231DRYR | Fixed 1.2V output, 3.6MHz switching, 400mA rated - lower current capability and no voltage-positioning feedback. | Suitable for lighter loads (<400mA); lacks LX-sensed regulation, resulting in higher transient overshoot vs. MAX8640ZELT12+. | Select when cost sensitivity outweighs need for 500mA headroom and precision transient response. |
| RT8059GJ6F | 1.2V fixed, 3MHz, 500mA, SOT-23-6 - larger 2.9mm × 2.8mm package and 60µA quiescent current. | Acceptable where PCB area is less constrained; higher IQ reduces battery runtime in always-on medical devices. | Choose only if µDFN assembly capability is unavailable and thermal performance requirements are relaxed. |
Compared with TPS62231DRYR and RT8059GJ6F, MAX8640ZELT12+ uniquely combines 500mA capability, 1.5mm × 1.0mm footprint, voltage-positioning regulation, and 28µA quiescent current - making it the optimal choice for next-generation ultra-compact, battery-sensitive embedded systems requiring robust transient immunity.
Availability
MAX8640ZELT12+ is available at Aetrix Electronics and suitable for microprocessor core power, portable medical monitoring, handheld consumer electronics, and space-constrained IoT edge nodes requiring stable component supply and long-term manufacturability.
Supply support for MAX8640ZELT12+ 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, automotive, communications, and consumer markets.
The MAX8640Y/MAX8640Z product line was designed specifically for ultra-small-footprint, high-efficiency DC-DC conversion in battery-powered portable electronics - prioritizing minimal external component count, low quiescent current, and fast transient response without compensation networks.
FAQ
What is the exact output voltage and tolerance of MAX8640ZELT12+?
The MAX8640ZELT12+ features a factory-preset output voltage of 1.2V 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 rail compliance for modern low-voltage microprocessors without post-production calibration.
Does MAX8640ZELT12+ require external compensation components?
No, MAX8640ZELT12+ does not require external compensation components. Its proprietary hysteretic PWM control architecture and voltage-positioning feedback topology (sampling the LX node) provide inherent loop stability with only a 2.2µF ceramic output capacitor. This simplifies design, reduces BOM count, and avoids tuning errors associated with traditional voltage-mode or current-mode compensators.
What package type and dimensions does MAX8640ZELT12+ use?
MAX8640ZELT12+ is packaged in a 6-pin µDFN (1.5mm × 1.0mm × 0.8mm) with exposed thermal pad, per package code L611-1 and document number 21-0147. The top mark is "NM". This RoHS-compliant, lead-free package enables ultra-dense PCB layouts and provides superior thermal performance compared to SC70 alternatives in the same family.
Can MAX8640ZELT12+ operate efficiently at very light loads?
Yes, MAX8640ZELT12+ operates efficiently at very light loads via ultrasonic pulse-skipping mode, maintaining switching frequency above 20kHz down to 1mA output current while drawing only 28µA typical quiescent current. This preserves battery life in standby or sensor-wakeup modes without introducing audible noise or regulation instability common in lower-frequency skip-mode converters.
What is the recommended inductor and output capacitor for MAX8640ZELT12+?
The datasheet specifies a 1µH inductor and 2.2µF ceramic output capacitor (X5R/X7R dielectric) for MAX8640ZELT12+. Recommended inductors include Murata LQM31P series (1µH, DCR ≈ 0.08Ω) or TDK GLF2012T (1µH, DCR ≈ 0.10Ω). The 2.2µF output capacitor must be placed adjacent to the OUT and GND pins to ensure loop stability and low ripple, as validated in Maxim's typical operating characteristics.
MAX8640ZELT12+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFDFN
- Packaging:
- Bulk
- 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):
- 1.2V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 3.6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (1.5x1)
MAX8640ZELT12+ FAQ
1.How can I place an order for MAX8640ZELT12+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640ZELT12+ 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+ reliable?
The price and inventory of MAX8640ZELT12+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640ZELT12+ is usually 5 days.
3.What payment methods are accepted for MAX8640ZELT12+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640ZELT12+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640ZELT12+?
MAX8640ZELT12+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640ZELT12+ 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+?
For technical support, including MAX8640ZELT12+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640ZELT12+ requirements.
6.How does Aetrix verify that MAX8640ZELT12+ is sourced from the original manufacturer or authorized distributors?
All MAX8640ZELT12+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX8640ZELT12+?
All MAX8640ZELT12+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640ZELT12+, 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+ part is unused and in its original packaging.
Return procedure for MAX8640ZELT12+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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