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Analog Devices Inc./Maxim Integrated MAX8640YELT18+T
- Part No.:
- MAX8640YELT18+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WFDFN
- Datasheet:
-
MAX8640YELT18+T.pdf
- Description:
- IC REG BUCK 1.8V 500MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:60,000
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Product details
Overview
MAX8640YELT18+T from Maxim Integrated is a 500mA, 2MHz synchronous step-down DC-DC converter in a 6-pin µDFN (1.5mm × 1.0mm) package, factory preset to 1.8V output, with 28µA quiescent current and ±1% initial output voltage accuracy. It delivers regulated power to microprocessor cores and I/O rails in space-constrained portable electronics.
For engineers reviewing the MAX8640YELT18+T datasheet, MAX8640YELT18+T pinout, MAX8640YELT18+T application, or MAX8640YELT18+T equivalent, key selection criteria include its 2.7V–5.5V input range, voltage-positioning load regulation, ultrasonic pulse-skipping mode down to 1mA, and compatibility with 2.2µH/4.7µF external components.
Technical Context
The MAX8640YELT18+T employs a proprietary hysteretic PWM control scheme optimized for fast transient response and stable operation with tiny ceramic capacitors. Its voltage-positioning feedback architecture samples the LX node directly, eliminating phase lag from output capacitance and enabling loop stability with only 4.7µF output capacitance.
This device operates exclusively in the MAX8640Y variant family-switching at up to 2MHz-not the 4MHz MAX8640Z variant. It integrates both high-side p-channel and low-side n-channel MOSFETs with on-resistances of 0.6Ω (pFET) and 0.35Ω (nFET), enabling synchronous rectification without an external Schottky diode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory preset 1.8V with ±1% initial accuracy - eliminates external resistor divider and ensures tight regulation at point-of-load. |
| Switching Frequency | Up to 2.0MHz - enables use of compact 2.2µH inductor and reduces EMI fundamental frequency above audible range. |
| Max Output Current | 500mA guaranteed - supports core power for low-power microcontrollers and DSPs in handheld devices. |
| Quiescent Current | 28µA typical - extends battery life in always-on or low-duty-cycle applications such as sensor nodes. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li+ (fully charged), 3.3V rails, and dual-cell alkaline systems. |
| Load Regulation | Voltage positioning: ΔVOUT = IL × DCR(L) - provides predictable droop under load and halves peak-to-peak excursion during transients. |
| Shutdown Current | 0.01µA typical - enables true zero-power disable for system-level power gating. |
Pinout & Package
MAX8640YELT18+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 and requires standard reflow profile for µDFN assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX | Inductor switch node | High-current connection to internal pFET drain and nFET source; must be routed short and wide to minimize EMI and switching losses. |
| GND (Pins 2 & 5) | Power and signal ground | Both pins must be tied together directly under IC and connected to input/output capacitor grounds to ensure low-impedance return path. |
| OUT | Feedback sense input | Internally connected to voltage-divider network; bypassed with ceramic capacitor to GND for stability and noise rejection. |
| SHDN | Active-low enable control | Logic-low ≥10µs after VIN exceeds UVLO (2.6V) resets internal logic; drives <0.01µA shutdown current when asserted. |
| IN | Main power input | Accepts 2.7V–5.5V supply; requires local 2.2µF ceramic decoupling capacitor placed adjacent to pin and GND. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-positioning feedback | Uses LX node sampling to eliminate output-capacitor phase lag, enabling stable regulation with 4.7µF ceramic output capacitor and halving transient overshoot. |
| Ultrasonic pulse-skipping mode | Maintains switching >20kHz down to 1mA load, avoiding audible noise while sustaining 28µA quiescent current and low output ripple. |
| Integrated synchronous MOSFETs | 0.6Ω pFET + 0.35Ω nFET replace external Schottky diode, improving full-load efficiency by ~8–12% and reducing thermal footprint. |
| Internal soft-start | Eliminates inrush current at startup, reducing stress on input source (e.g., Li+ battery) and allowing smaller input capacitor (≥2.2µF). |
| Fast line/load transient response | Settles within 40µs for 5mA ↔ 500mA load steps and 4V ↔ 3.5V input steps - critical for powering burst-mode processors and RF ICs. |
Applications
| Microprocessor Core Power | I/O Rail Supply |
|---|---|
|
Use Scenario: Powering ARM Cortex-M0+ or RISC-V MCU core operating at 1.8V with dynamic current draw from 10µA to 400mA. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated 1.8V core voltage with fast load-transient recovery to prevent brownout during instruction fetch bursts. Use Value: Voltage-positioning load regulation ensures ≤25mV droop at 400mA, maintaining timing margin and eliminating need for oversized output capacitance. |
Use Scenario: Supplying 1.8V I/O banks for FPGA configuration interfaces or USB PHY logic in portable medical devices. IC Role / Device Role / Timing Role: Secondary buck converter providing clean, low-noise 1.8V rail isolated from noisy digital domains via dedicated µDFN layout. Use Value: 2MHz switching allows compact 2.2µH inductor placement near BGA I/O pads, minimizing trace inductance and improving signal integrity. |
| Cell Phone Baseband Power | Wearable Sensor Hub Supply |
|
Use Scenario: Delivering 1.8V to LTE/WCDMA baseband processor during data transmission bursts in ultra-thin smartphones. IC Role / Device Role / Timing Role: High-efficiency step-down regulator supporting 500mA peak loads with <40µs transient recovery to sustain modem clock stability. Use Value: 28µA quiescent current extends standby time between transmissions; ultrasonic skip mode prevents audible coil whine during idle periods. |
Use Scenario: Powering ultra-low-power inertial measurement unit (IMU) and BLE SoC in fitness trackers with coin-cell battery (3V nominal). IC Role / Device Role / Timing Role: Primary power stage converting 3V battery to stable 1.8V, operating across full battery discharge curve (3.3V → 2.7V). Use Value: 2.7V minimum input enables full utilization of battery capacity; shutdown current <0.01µA preserves shelf life over multi-year deployments. |
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 |
|---|---|---|---|
| TPS62231DRYT | 2.25MHz fixed-frequency PWM; 300mA rated; requires external feedback resistors; no voltage-positioning architecture. | Lacks load-transient performance and output capacitor flexibility of MAX8640YELT18+T; better suited for cost-sensitive, non-battery apps. | Select when board space permits larger 4.7µH inductor and design prioritizes BOM cost over transient response. |
| RT8059GJ6F | 1.5MHz constant-on-time control; 600mA rated; 1.8V preset option available; no LX-sampling feedback; higher 45µA IQ. | Higher quiescent current reduces battery runtime; lacks voltage-positioning benefit for tight load-regulation requirements. | Choose only if 600mA headroom is mandatory and 1.8V preset availability outweighs efficiency and transient trade-offs. |
Compared with TPS62231DRYT and RT8059GJ6F, MAX8640YELT18+T uniquely combines 1.8V factory preset, voltage-positioning load regulation, and ultrasonic skip mode-enabling smaller passive count, lower output droop, and longer battery life in size- and efficiency-critical portable designs.
Availability
MAX8640YELT18+T is available at Aetrix Electronics and suitable for microprocessor core power, I/O rail supply, and wearable sensor hub applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8640YELT18+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, high-efficiency DC-DC conversion in battery-powered handheld devices where PCB area, quiescent current, and transient response are critical constraints.
FAQ
What is the output voltage setting of the MAX8640YELT18+T?
The MAX8640YELT18+T is factory preset to deliver a nominal 1.8V output with ±1% initial accuracy at 25°C and ±2% over the full -40°C to +85°C temperature range. This fixed output eliminates the need for external feedback resistors and simplifies layout for space-constrained applications.
Does the MAX8640YELT18+T support shutdown functionality?
Yes, the MAX8640YELT18+T features an active-low SHDN pin (Pin 4). Driving this pin logic-low disables the DC-DC converter and reduces supply current to 0.01µA typical. A minimum 10µs low pulse is required after VIN rises above UVLO (2.6V) to reset internal logic before enabling.
What external components are required for basic operation of the MAX8640YELT18+T?
The MAX8640YELT18+T requires only three external components: a 2.2µH inductor between IN and LX, a 4.7µF ceramic output capacitor between OUT and GND, and a 2.2µF ceramic input capacitor between IN and GND. No feedback resistors or compensation networks are needed due to factory preset voltage and internal voltage-positioning architecture.
How does the voltage-positioning feature of the MAX8640YELT18+T improve load transient performance?
The MAX8640YELT18+T samples the LX node instead of the OUT node for feedback, making output voltage droop proportional to inductor DCR × load current. This results in predictable, linear droop that halves peak-to-peak output excursions during load transients compared to conventional buck regulators-critical for maintaining timing margins in microprocessor cores.
Is the MAX8640YELT18+T pin-compatible with other variants in the MAX8640Y/MAX8640Z family?
Yes, all MAX8640Y and MAX8640Z variants-including MAX8640YELT18+T-share identical 6-pin µDFN (1.5mm × 1.0mm) and SC70 (2.0mm × 2.1mm) footprints and pinouts. However, switching frequency (2MHz vs. 4MHz), output voltage, and recommended inductor/capacitor values differ per variant and must be verified per design requirements.
MAX8640YELT18+T 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):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (1.5x1)
MAX8640YELT18+T FAQ
1.How can I place an order for MAX8640YELT18+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640YELT18+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 MAX8640YELT18+T reliable?
The price and inventory of MAX8640YELT18+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640YELT18+T is usually 5 days.
3.What payment methods are accepted for MAX8640YELT18+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640YELT18+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640YELT18+T?
MAX8640YELT18+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640YELT18+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 MAX8640YELT18+T?
For technical support, including MAX8640YELT18+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640YELT18+T requirements.
6.How does Aetrix verify that MAX8640YELT18+T is sourced from the original manufacturer or authorized distributors?
All MAX8640YELT18+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 MAX8640YELT18+T meets industry standards.
7.What is the process for return or replacement of MAX8640YELT18+T?
All MAX8640YELT18+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640YELT18+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 MAX8640YELT18+T part is unused and in its original packaging.
Return procedure for MAX8640YELT18+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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