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Analog Devices Inc./Maxim Integrated MAX8640ZELT18+T
- Part No.:
- MAX8640ZELT18+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WFDFN
- Datasheet:
-
MAX8640ZELT18+T.pdf
- Description:
- IC REG BUCK 1.8V 500MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,492
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Product details
Overview
MAX8640ZELT18+T from Maxim Integrated is a 500mA, 4MHz synchronous step-down DC-DC converter in a 6-pin µDFN (1.5mm × 1.0mm) package, factory preset to 1.8V output, operating from 2.7V–5.5V input, with 28µA quiescent current and ±1% initial output accuracy. It delivers regulated core power to space-constrained portable electronics such as smartphones and PDAs.
For engineers reviewing the MAX8640ZELT18+T datasheet, MAX8640ZELT18+T pinout, MAX8640ZELT18+T application, or MAX8640ZELT18+T equivalent, key selection criteria include its 4MHz switching frequency enabling 1µH inductors and 2.2µF output capacitors, ultrasonic skip mode down to 1mA loads, and voltage-positioning load regulation for minimal transient overshoot.
Technical Context
The MAX8640ZELT18+T employs a proprietary hysteretic PWM control scheme optimized for high efficiency and fast transient response at up to 4MHz switching. Its internal synchronous rectification replaces external Schottky diodes, reducing conduction losses and board area.
Voltage-positioning feedback uses the LX node to eliminate phase lag from the output capacitor, yielding load regulation equal to inductor DC resistance × load current. This architecture enables stable operation with tiny ceramic capacitors and halves peak-to-peak output-voltage excursions during load transients compared to conventional buck converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory preset 1.8V ±1% initial accuracy - eliminates external feedback resistors and ensures precise core rail compliance. |
| Switching Frequency | Up to 4MHz - enables use of 1µH inductors and 2.2µF ceramic output capacitors, minimizing solution footprint. |
| Max Output Current | 500mA guaranteed - supports microprocessor/DSP core rails and I/O supplies in handheld devices. |
| Quiescent Current | 28µA typical - extends battery life in always-on or low-duty-cycle portable applications. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li+ (3.0–4.2V), alkaline, and USB-powered systems. |
| Shutdown Current | 0.01µA typical - reduces system standby power to negligible levels when disabled. |
| Load Transient Response | Ultralow overshoot/undershoot due to voltage-positioning regulation - maintains tight output tolerance during rapid load steps. |
Pinout & Package
MAX8640ZELT18+T is housed in a lead-free, RoHS-compliant 6-pin µDFN package measuring 1.5mm × 1.0mm with 0.5mm pitch. The package features exposed thermal pad for enhanced power dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX | Inductor connection to internal p-channel and n-channel MOSFET drains | High-impedance during shutdown; carries high-frequency AC inductor current - requires short, wide trace routing to minimize EMI. |
| GND (Pins 2 & 5) | Ground reference for power and feedback paths | Must be connected together directly under IC and tied to input/output capacitor grounds - critical for loop stability and noise immunity. |
| OUT | Output sense input tied to internal feedback network | Bypassed with ceramic capacitor near pin; enables voltage-positioning regulation without external resistors. |
| SHDN | Active-low shutdown control input | Logic-high enables regulation; requires ≥10µs low pulse after VIN exceeds UVLO to reset logic - supports sequenced power-up. |
| IN | Main supply input (2.7V–5.5V) | Bypassed with ceramic capacitor near pin; powers internal circuitry and high-side switch - low-ESR cap essential for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| 4MHz switching frequency | Enables 1µH inductor + 2.2µF output capacitor solution - reduces total BOM footprint by >40% vs. 2MHz alternatives. |
| Voltage-positioning load regulation | Load regulation = inductor DCR × ILOAD - eliminates traditional feedback loop instability and enables sub-100mV transient excursions at 500mA step loads. |
| Internal synchronous rectification | Replaces external Schottky diode - improves full-load efficiency by ~8% and removes diode thermal management concerns. |
| Ultrasonic skip mode | Maintains switching above 20kHz down to 1mA loads - prevents audible noise while sustaining <30µA quiescent current. |
| Fast soft-start | Eliminates inrush current - reduces required input capacitance and avoids brownout on high-impedance sources like coin cells. |
Applications
| Smartphone Application | Digital Camera Core Power |
|---|---|
|
Use Scenario: Powers ARM Cortex-A series application processor core rail in slim smartphone designs where PCB area is constrained below 10mm². IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering stable 1.8V at up to 500mA with dynamic voltage scaling support. Use Value: 4MHz operation allows 1µH inductor placement adjacent to SoC, reducing layout parasitics and improving transient response to CPU burst loads. |
Use Scenario: Supplies image signal processor (ISP) core in digital still cameras requiring low-noise, tightly regulated 1.8V under variable processing loads. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter with ultrasonic skip mode to prevent audible coil whine during silent capture modes. Use Value: Voltage-positioning regulation minimizes output deviation during ISP clock-gating events, preventing frame corruption or sensor reset. |
| Portable Medical Monitor | Wearable Fitness Tracker |
|
Use Scenario: Provides regulated 1.8V supply to low-power microcontroller and analog front-end in battery-operated patient monitors with 72-hour runtime requirement. IC Role / Device Role / Timing Role: Always-on power stage with 28µA quiescent current and 0.01µA shutdown - enables long-term data logging without battery replacement. Use Value: Fast line-transient response (<20µs recovery) maintains MCU operation during battery voltage sag from pulse oximetry LED activation. |
Use Scenario: Powers Bluetooth LE SoC and motion sensor hub in wrist-worn fitness trackers where thickness must remain under 12mm. IC Role / Device Role / Timing Role: Compact µDFN-based buck converter supporting dynamic power states - active, sleep, and deep-sleep modes. Use Value: Tiny 1.5mm × 1.0mm footprint frees PCB area for antenna routing and battery integration while maintaining ±1% output accuracy across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 2.25V–5.5V input, 1.8V fixed output, 4MHz, 500mA, 22µA IQ, 6-pin WSON (2.0mm × 2.0mm) | Larger package (2.0mm × 2.0mm vs. 1.5mm × 1.0mm); no voltage-positioning regulation - higher transient overshoot. | Preferred when WSON handling is preferred over µDFN, or when TI ecosystem design support is prioritized. |
| RT8059GJ6 | 2.5V–5.5V input, 1.8V fixed output, 3MHz, 600mA, 30µA IQ, 6-pin SOT-563 (1.6mm × 1.6mm) | Slightly lower switching frequency limits inductor size reduction; lacks ultrasonic skip mode - may generate audible noise at light loads. | Selected for cost-sensitive designs needing marginally higher current rating and SOT-563 assembly compatibility. |
Compared with TPS62231DRYR and RT8059GJ6, MAX8640ZELT18+T offers the smallest footprint (1.5mm × 1.0mm), unique voltage-positioning regulation for superior transient performance, and guaranteed ultrasonic operation down to 1mA - making it optimal for ultra-thin, noise-sensitive portable systems.
Availability
MAX8640ZELT18+T is available at Aetrix Electronics and suitable for smartphone core power, portable medical monitor rails, and wearable fitness tracker SoC supplies requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for MAX8640ZELT18+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 industrial, communications, computing, and consumer applications.
The MAX8640Y/MAX8640Z product line was engineered specifically for space-constrained portable electronics requiring high-efficiency, low-noise, and ultra-small-footprint DC-DC conversion - targeting smartphones, PDAs, DSCs, and other handhelds.
FAQ
What is the switching frequency of the MAX8640ZELT18+T and how does it impact external component selection?
The MAX8640ZELT18+T operates at up to 4MHz, enabling the use of a 1µH inductor and 2.2µF ceramic output capacitor. This high-frequency capability significantly reduces solution size compared to lower-frequency buck converters, allowing placement in tight spaces near processors or sensors. The 4MHz operation is confirmed in the Selector Guide and Typical Operating Characteristics section of the datasheet for the MAX8640ZELT18+T variant.
Does the MAX8640ZELT18+T require external feedback resistors to set its output voltage?
No, the MAX8640ZELT18+T is factory-preset to 1.8V output and does not require external feedback resistors. Its OUT pin connects directly to the internal voltage divider, eliminating resistor placement, trimming, and associated board area. This configuration is explicitly stated in the General Description and Pin Description sections of the MAX8640ZELT18+T datasheet.
What is the quiescent current of the MAX8640ZELT18+T and how does it affect battery life in portable devices?
The MAX8640ZELT18+T has a typical quiescent current of 28µA, which directly extends battery runtime in always-on or low-duty-cycle portable applications. At light loads, it enters ultrasonic skip mode while maintaining this low IQ, avoiding audible noise. This value is specified in the Electrical Characteristics table and verified across the -40°C to +85°C operating range for the MAX8640ZELT18+T.
How does the voltage-positioning load regulation in the MAX8640ZELT18+T improve transient performance?
Voltage-positioning regulation in the MAX8640ZELT18+T ties feedback to the LX node, removing phase lag from the output capacitor and making load regulation equal to inductor DCR × load current. This architecture halves peak-to-peak output-voltage excursions during load transients versus conventional buck converters - a benefit demonstrated in the Load-Transient Response plots for the MAX8640ZELT18+T in the datasheet.
What package type and dimensions does the MAX8640ZELT18+T use, and what are its thermal characteristics?
The MAX8640ZELT18+T uses a 6-pin µDFN package measuring 1.5mm × 1.0mm with 0.5mm pitch and an exposed thermal pad. Its continuous power dissipation at TA = +70°C is 167.7mW, with thermal derating of 2.1mW/°C above that temperature. These mechanical and thermal specifications are documented in the Package Information section and Absolute Maximum Ratings table for the MAX8640ZELT18+T.
MAX8640ZELT18+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFDFN
- 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):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (1.5x1)
MAX8640ZELT18+T FAQ
1.How can I place an order for MAX8640ZELT18+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640ZELT18+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 MAX8640ZELT18+T reliable?
The price and inventory of MAX8640ZELT18+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640ZELT18+T is usually 5 days.
3.What payment methods are accepted for MAX8640ZELT18+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640ZELT18+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640ZELT18+T?
MAX8640ZELT18+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640ZELT18+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 MAX8640ZELT18+T?
For technical support, including MAX8640ZELT18+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640ZELT18+T requirements.
6.How does Aetrix verify that MAX8640ZELT18+T is sourced from the original manufacturer or authorized distributors?
All MAX8640ZELT18+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 MAX8640ZELT18+T meets industry standards.
7.What is the process for return or replacement of MAX8640ZELT18+T?
All MAX8640ZELT18+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640ZELT18+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 MAX8640ZELT18+T part is unused and in its original packaging.
Return procedure for MAX8640ZELT18+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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