My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX8640YELT12+T
- Part No.:
- MAX8640YELT12+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WFDFN
- Datasheet:
-
MAX8640YELT12+T.pdf
- Description:
- IC REG BUCK 1.2V 500MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,929
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX8640YELT12+T from Maxim Integrated is a synchronous step-down DC-DC converter optimized for space-constrained portable applications, delivering 500mA output current at a factory-preset 1.2V output voltage with ±1% initial accuracy, 2.7V–5.5V input range, and 1.8MHz switching frequency in a 6-pin µDFN (1.5mm × 1.0mm) package.
For engineers reviewing the MAX8640YELT12+T datasheet, MAX8640YELT12+T pinout, MAX8640YELT12+T application, or MAX8640YELT12+T equivalent, key selection criteria include ultrasonic pulse-skipping mode down to 1mA loads, 28µA quiescent current, voltage-positioning load regulation, and compatibility with 2.2µH inductors and 4.7µF ceramic output capacitors.
Technical Context
The MAX8640YELT12+T implements a proprietary hysteretic PWM control scheme that enables fast line/load transient response and maintains 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 operation with minimal ceramic capacitance.
Internal synchronous rectification replaces external Schottky diodes, improving efficiency and reducing thermal stress. The device supports active-low shutdown with 10µs minimum reset time after UVLO, and features integrated soft-start to eliminate inrush current-critical for Li+-cell and alkaline-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-preset 1.2V with ±1% initial accuracy - eliminates external resistor divider and ensures precise core/I/O rail regulation. |
| Switching Frequency | 1.8MHz - enables use of compact 2.2µH inductors and reduces EMI in ultrasonic range, avoiding audible noise. |
| Max Output Current | 500mA guaranteed - sufficient for microprocessor cores, DSPs, and high-speed I/O rails in handheld devices. |
| Quiescent Current | 28µA typical - extends battery life in always-on or low-duty-cycle portable systems (e.g., PDAs, MP3 players). |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li+, Li-polymer, and dual-cell alkaline/NiMH battery inputs. |
| Package | 6-pin µDFN (1.5mm × 1.0mm, 0.5mm height) - ultra-small footprint ideal for space-limited PCB layouts. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and consumer portable equipment environments. |
Pinout & Package
MAX8640YELT12+T is housed in a lead-free, RoHS-compliant 6-pin µDFN package (1.5mm × 1.0mm, 0.5mm height), with exposed thermal pad for enhanced power dissipation. Pin 1 is marked by a dot or notch on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | LX | Switch node connecting internal p-channel and n-channel MOSFET drains - requires short, low-inductance routing to inductor; high-impedance during shutdown. |
| 2,5 | GND | Dual ground terminals - must be connected together directly under IC and tied to input/output capacitor grounds to minimize ground bounce and improve stability. |
| 3 | OUT | Output sense input - 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 shutdown control - logic-low disables regulator and resets internal logic; requires ≥10µs low pulse after VIN exceeds UVLO threshold (2.6V typ). |
| 6 | IN | Main supply input (2.7V–5.5V) - bypass with ceramic capacitor placed adjacent to pin 6 and pin 5 (GND) to suppress switching noise and reduce input current spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-positioning load regulation | Load regulation error equals inductor DCR × load current - reduces transient overshoot by ~50% vs. conventional buck regulators and simplifies compensation. |
| Ultrasonic pulse-skipping mode | Operates down to 1mA loads while maintaining switching frequency above 20kHz - prevents audible coil whine and preserves low-noise performance. |
| Integrated soft-start | Eliminates inrush current at startup - reduces required input capacitance and avoids brownout on high-impedance sources like coin cells or aging batteries. |
| Synchronous rectification | Replaces external Schottky diode - improves full-load efficiency by up to 10% and removes thermal management concerns associated with discrete diodes. |
| Small external component count | Supports 2.2µH inductor + 4.7µF output capacitor only - enables total solution size under 12mm², including passive components. |
Applications
| Microprocessor Core Power | I/O Rail Supply |
|---|---|
|
Use Scenario: Powering ARM Cortex-M4/M7 or RISC-V MCU cores requiring stable 1.2V at up to 500mA with fast transient response during burst-mode operation. IC Role / Device Role / Timing Role: Primary step-down regulator providing tightly regulated core voltage; delivers sub-100ns load-step recovery per typical characterization data. Use Value: Voltage-positioning architecture minimizes peak-to-peak output deviation during 10mA→500mA transients - critical for preventing core clock instability or cache corruption. |
Use Scenario: Supplying 1.2V I/O banks for FPGAs, ASICs, or high-speed serial interfaces (e.g., USB 2.0 PHY, SDIO) in handheld devices. IC Role / Device Role / Timing Role: Secondary buck regulator delivering low-noise, low-ripple I/O voltage; operates in fixed-frequency PWM mode during heavy loads. Use Value: 1.8MHz switching allows small 2.2µH inductor placement near I/O pins - reduces board area and improves signal integrity by minimizing power rail coupling. |
| Cell Phone Baseband Power | Portable Media Player DSP Supply |
|
Use Scenario: Regulating 1.2V supply for cellular baseband processors (e.g., Qualcomm Snapdragon modem subsystems) in slim smartphones. IC Role / Device Role / Timing Role: High-efficiency buck converter operating from single-cell Li+ (3.0V–4.2V); enters ultrasonic skip mode during idle periods. Use Value: 28µA quiescent current extends standby battery life - measured at 2.7V input, enabling >72-hour standby with 100mAh battery. |
Use Scenario: Powering audio DSPs in MP3 players or Bluetooth headphones where acoustic noise and battery runtime are critical constraints. IC Role / Device Role / Timing Role: Low-noise, ultrasonic-capable DC-DC converter supplying clean 1.2V rail; avoids audible switching artifacts via >20kHz skip mode. Use Value: Eliminates need for external Schottky diode and reduces total BOM count - lowers assembly cost and improves reliability in high-volume consumer products. |
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 | 1.8V–5.5V input; 1.2V output preset; 3MHz switching; 400mA max output; 6-pin WSON (2.0mm × 2.0mm) | Higher switching frequency enables smaller inductors but increases switching losses above 300mA; no voltage-positioning architecture | Preferred when board space permits slightly larger package and higher-frequency EMI filtering is acceptable. |
| RT8059NGSP | 2.5V–5.5V input; adjustable output via resistors; 2MHz switching; 600mA max output; 6-pin SOT-23-6 | Requires external feedback resistors; lacks factory-preset option and ultrasonic skip mode below 10mA | Chosen when output voltage flexibility outweighs need for minimal BOM count and lowest quiescent current. |
Compared with TPS62231DRYT and RT8059NGSP, MAX8640YELT12+T offers superior light-load efficiency due to its 28µA IQ and ultrasonic skip mode, tighter output accuracy (±1%), and smaller µDFN footprint - making it optimal for battery-sensitive, space-constrained designs where fixed 1.2V output is acceptable.
Availability
MAX8640YELT12+T is available at Aetrix Electronics and suitable for microprocessor core power, I/O rail supply, and portable media player DSP applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8640YELT12+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 - emphasizing minimal external components, low quiescent current, and robust transient performance.
FAQ
What is the factory-preset output voltage of the MAX8640YELT12+T?
The MAX8640YELT12+T is factory-configured for a nominal 1.2V output voltage with ±1% initial accuracy at +25°C and ±2% over the full -40°C to +85°C operating temperature range. This fixed output eliminates the need for external feedback resistors and ensures consistent regulation without calibration.
Does the MAX8640YELT12+T support ultrasonic operation at light loads?
Yes, the MAX8640YELT12+T automatically enters ultrasonic pulse-skipping mode down to 1mA load current, maintaining switching frequency above 20kHz to prevent audible noise from inductor vibration - a key feature confirmed in the Typical Operating Characteristics section of the datasheet.
What package type and dimensions does the MAX8640YELT12+T use?
The MAX8640YELT12+T uses a 6-pin µDFN package measuring 1.5mm × 1.0mm with 0.5mm height and an exposed thermal pad. It is lead-free and RoHS-compliant, with top mark "ND" as specified in the Selector Guide and Ordering Information tables.
Can the MAX8640YELT12+T operate from a single-cell Li+ battery?
Yes, the MAX8640YELT12+T supports an input voltage range of 2.7V to 5.5V, fully covering the discharge curve of a single-cell Li+ battery (typically 4.2V fully charged down to 2.8V cutoff), ensuring uninterrupted operation across the entire battery life cycle.
What is the recommended inductor and output capacitor for the MAX8640YELT12+T?
The MAX8640YELT12+T is optimized for a 2.2µH inductor and 4.7µF ceramic output capacitor, as specified in the Selector Guide. These values balance efficiency, transient response, and physical size - with the 2.2µH inductor's DCR (75mΩ–150mΩ) enabling voltage-positioning load regulation.
MAX8640YELT12+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFDFN
- Packaging:
- Tape & Reel (TR)
- 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:
- 1.8MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (1.5x1)
MAX8640YELT12+T FAQ
1.How can I place an order for MAX8640YELT12+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640YELT12+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 MAX8640YELT12+T reliable?
The price and inventory of MAX8640YELT12+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640YELT12+T is usually 5 days.
3.What payment methods are accepted for MAX8640YELT12+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640YELT12+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640YELT12+T?
MAX8640YELT12+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640YELT12+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 MAX8640YELT12+T?
For technical support, including MAX8640YELT12+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640YELT12+T requirements.
6.How does Aetrix verify that MAX8640YELT12+T is sourced from the original manufacturer or authorized distributors?
All MAX8640YELT12+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 MAX8640YELT12+T meets industry standards.
7.What is the process for return or replacement of MAX8640YELT12+T?
All MAX8640YELT12+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640YELT12+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 MAX8640YELT12+T part is unused and in its original packaging.
Return procedure for MAX8640YELT12+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX8640YELT12+T Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
