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Analog Devices Inc./Maxim Integrated MAX8640ZEXT12+T
- Part No.:
- MAX8640ZEXT12+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
MAX8640ZEXT12+T.pdf
- Description:
- IC REG BUCK 1.2V 500MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,523
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Product details
Overview
MAX8640ZEXT12+T from Maxim Integrated is a 500mA, 4MHz synchronous step-down DC-DC converter in a 6-pin SC70 package, delivering a factory-preset 1.2V output with ±1% initial accuracy and 28µA quiescent current. It operates from 2.7V to 5.5V input, supports ultrasonic pulse-skipping down to 1mA loads, and enables compact power delivery using only a 1µH inductor and 2.2µF output capacitor - ideal for space-constrained portable applications.
For engineers reviewing the MAX8640ZEXT12+T datasheet, MAX8640ZEXT12+T pinout, MAX8640ZEXT12+T application, or MAX8640ZEXT12+T equivalent, key selection criteria include its 4MHz switching frequency for minimal external component size, voltage-positioning load regulation (equal to inductor DCR × ILOAD), shutdown current of 0.01µA typical, and guaranteed 500mA output across –40°C to +85°C.
Technical Context
The MAX8640ZEXT12+T implements a proprietary hysteretic PWM control scheme optimized for fast transient response and low output ripple at all loads. Its 4MHz fixed-frequency operation enables use of a 1µH inductor and 2.2µF ceramic output capacitor while maintaining ultrasonic skip-mode operation down to 1mA.
Voltage-positioning feedback architecture samples the LX node directly, eliminating phase lag from the output capacitor and enabling stable loop dynamics with tiny ceramics. Internal synchronous rectification replaces the external Schottky diode, 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 +25°C - eliminates external resistor divider and ensures precise core/I/O rail regulation. |
| Switching Frequency | Up to 4MHz - enables use of 1µH inductors and 2.2µF ceramic capacitors, reducing solution footprint by >40% vs. 2MHz alternatives. |
| Output Current | Guaranteed 500mA continuous - sufficient for microprocessor cores, DSPs, and high-speed I/O in handheld devices. |
| 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, and regulated 3.3V/5V rails. |
| Shutdown Current | 0.01µA typical - reduces system standby power to negligible levels during deep sleep modes. |
| Load Regulation | Voltage-positioning type: ΔVOUT = ILOAD × RDCR(L1) - provides predictable droop and halves peak-to-peak transient excursions vs. conventional buck regulators. |
Pinout & Package
MAX8640ZEXT12+T is housed in a lead-free, RoHS-compliant 6-pin SC70 package (2.0mm × 2.1mm), optimized for high-density PCB layouts and thermal performance in thin-profile portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - LX | Inductor switch node | Connects to internal p-channel and n-channel MOSFET drains; high-impedance during shutdown; requires short, low-inductance trace to minimize EMI. |
| 2,5 - GND | Power ground | Two dedicated ground pins must be connected together directly under the IC and tied to input/output capacitor grounds for optimal noise immunity and thermal dissipation. |
| 3 - OUT | Output voltage sense | Internally connected to feedback network; bypass with ceramic capacitor placed adjacent to pin 3 and pin 2 to stabilize regulation loop and reduce ripple. |
| 4 - SHDN | Active-low enable | Logic-low ≥10µs after VIN exceeds UVLO (2.6V) resets internal logic; drives regulator into 0.01µA shutdown state with high-impedance LX. |
| 6 - IN | Input supply | Accepts 2.7V–5.5V; bypass with ceramic capacitor placed adjacent to pin 6 and pin 5 to suppress switching noise and support soft-start current surges. |
Key Features
| Feature | Design Value |
|---|---|
| 4MHz switching frequency | Enables 1µH inductor + 2.2µF output capacitor solution - reduces total BOM area by ~35% versus 2MHz variants like MAX8640YEXT12+T. |
| Voltage-positioning load regulation | Delivers predictable VOUT droop equal to ILOAD × RDCR, cutting load-transient overshoot/undershoot by 50% compared to standard buck topologies. |
| Ultrasonic pulse-skipping mode | Maintains switching above 20kHz down to 1mA loads - eliminates audible noise while preserving 28µA quiescent current efficiency. |
| Internal synchronous rectification | Replaces external Schottky diode, improving full-load efficiency by up to 8% and simplifying layout with no reverse-recovery concerns. |
| Fast soft-start | Eliminates inrush current without external components - reduces required input capacitance and prevents brownout on weak sources (e.g., coin cells). |
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 in wearables and IoT edge nodes. IC Role / Device Role / Timing Role: Primary step-down regulator providing tightly regulated core voltage with fast load-transient response to handle burst-mode CPU activity. Use Value: Voltage-positioning regulation minimizes VOUT deviation during 0→500mA transients, preventing core reset or timing violations during wake-up events. |
Use Scenario: Supplying 1.2V I/O banks for FPGAs, sensors, or display interfaces in compact handheld medical devices. IC Role / Device Role / Timing Role: Dedicated point-of-load converter ensuring clean, low-noise I/O voltage independent of main system rail fluctuations. Use Value: 4MHz operation and integrated sync rectifier deliver <15mVPP output ripple at 200mA, meeting LVCMOS/LVTTL noise margin requirements. |
| Cell Phone Baseband Power | Portable Audio Codec Supply |
|
Use Scenario: Delivering 1.2V to cellular baseband processors in slim smartphones where board area is constrained by battery and camera modules. IC Role / Device Role / Timing Role: High-frequency buck converter enabling smallest possible passive component footprint while supporting dynamic voltage scaling. Use Value: SC70 package (2.0mm × 2.1mm) plus 1µH/2.2µF solution occupies <3.5mm² total area - critical for antenna clearance and mechanical stack-up. |
Use Scenario: Powering stereo audio codecs in Bluetooth headsets requiring ultra-low quiescent current and zero audible switching noise. IC Role / Device Role / Timing Role: Always-on LDO-replacement regulator supplying clean 1.2V with ultrasonic skip mode active below 10mA. Use Value: 28µA IQ and >20kHz skip frequency eliminate hiss and extend battery runtime beyond 100 hours in standby mode. |
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 |
|---|---|---|---|
| MAX8640YEXT12+T | 2MHz switching frequency; requires 2.2µH inductor and 4.7µF output capacitor; same 1.2V preset, ±1% accuracy, and SC70 package. | Better peak efficiency (>92% at 300mA) but larger solution size; suited for battery-powered systems prioritizing runtime over board area. | Select MAX8640YEXT12+T when efficiency > size is the primary constraint and 2MHz operation is acceptable. |
| TPS62231DRYT | 3MHz switching; 1.2V fixed output; 600mA rating; 2.5V–6.5V input; 6-pin WSON (2.0mm × 2.0mm); 25µA IQ. | Wider input range and higher current capability; different pinout (IN/GND/EN/PH/VOUT/GND) - not pin-compatible. | Choose TPS62231DRYT for designs needing >5.5V input support or margin above 500mA, accepting layout redesign. |
Compared with MAX8640YEXT12+T, the MAX8640ZEXT12+T trades ~3% peak efficiency for >40% smaller passive component area; versus TPS62231DRYT, it offers tighter output accuracy (±1% vs. ±2%) and lower shutdown current (0.01µA vs. 1µA), but lacks input voltage headroom above 5.5V.
Availability
MAX8640ZEXT12+T is available at Aetrix Electronics and suitable for microprocessor core power, I/O rail supply, cell phone baseband power, and portable audio codec supply requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for MAX8640ZEXT12+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, automotive, communications, and consumer applications.
The MAX8640Y/MAX8640Z product line delivers ultra-compact, high-efficiency step-down converters targeting space- and battery-limited portable electronics where small size, low IQ, and fast transient response are critical.
FAQ
What is the exact output voltage and accuracy of the MAX8640ZEXT12+T?
The MAX8640ZEXT12+T provides 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 voltage regulation without calibration.
Does the MAX8640ZEXT12+T require external compensation components?
No, the MAX8640ZEXT12+T uses an internally compensated voltage-positioning control architecture that samples the LX node directly. This eliminates external compensation networks and allows stable operation with only a 1µH inductor and 2.2µF ceramic output capacitor - no additional resistors or capacitors are needed.
What is the minimum input voltage required for the MAX8640ZEXT12+T to operate?
The MAX8640ZEXT12+T has an undervoltage lockout (UVLO) threshold of 2.6V (typical) with 100mV hysteresis. It begins switching once the input voltage rises above 2.6V and remains operational down to 2.7V per specification - making it compatible with single-cell Li+ batteries across their full discharge curve.
Can the MAX8640ZEXT12+T be used in place of the MAX8640YEXT12+T without layout changes?
No - although both share the same 6-pin SC70 package and 1.2V output, the MAX8640ZEXT12+T switches at 4MHz and is optimized for a 1µH inductor and 2.2µF output capacitor, whereas the MAX8640YEXT12+T uses 2.2µH and 4.7µF. Substituting them requires revising passive component values and verifying stability and transient response.
What is the shutdown current specification for the MAX8640ZEXT12+T?
The MAX8640ZEXT12+T draws only 0.01µA (typical) in shutdown mode when the SHDN pin is held low. This ultra-low leakage supports multi-year battery life in always-off or deep-sleep states, such as in remote sensors or emergency beacon applications where MAX8640ZEXT12+T powers the wake-up circuitry.
MAX8640ZEXT12+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- 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):
- 1.2V
- 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:
- SC-70-6
MAX8640ZEXT12+T FAQ
1.How can I place an order for MAX8640ZEXT12+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640ZEXT12+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 MAX8640ZEXT12+T reliable?
The price and inventory of MAX8640ZEXT12+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640ZEXT12+T is usually 5 days.
3.What payment methods are accepted for MAX8640ZEXT12+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640ZEXT12+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640ZEXT12+T?
MAX8640ZEXT12+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640ZEXT12+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 MAX8640ZEXT12+T?
For technical support, including MAX8640ZEXT12+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640ZEXT12+T requirements.
6.How does Aetrix verify that MAX8640ZEXT12+T is sourced from the original manufacturer or authorized distributors?
All MAX8640ZEXT12+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 MAX8640ZEXT12+T meets industry standards.
7.What is the process for return or replacement of MAX8640ZEXT12+T?
All MAX8640ZEXT12+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640ZEXT12+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 MAX8640ZEXT12+T part is unused and in its original packaging.
Return procedure for MAX8640ZEXT12+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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