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Analog Devices Inc./Maxim Integrated MAX8640ZEXT13+
- Part No.:
- MAX8640ZEXT13+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
MAX8640ZEXT13+.pdf
- Description:
- IC REG BUCK 1.3V 500MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,704
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Product details
Overview
MAX8640ZEXT13+ from Maxim Integrated is a 500mA, 4MHz synchronous step-down DC-DC converter in a 6-pin SC70 package, delivering a factory-preset 1.3V 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 in space-constrained portable electronics.
For engineers reviewing the MAX8640ZEXT13+ datasheet, MAX8640ZEXT13+ pinout, MAX8640ZEXT13+ application, or MAX8640ZEXT13+ equivalent, key selection criteria include its 3.7MHz switching frequency (confirmed for this variant), voltage-positioning load regulation, 1µH/2.2µF external component requirement, shutdown logic timing (tSHDN ≥10µs), and SC70 package thermal limits (245mW at +70°C).
Technical Context
The MAX8640ZEXT13+ implements a proprietary hysteretic PWM control scheme optimized for high efficiency and fast transient response at up to 3.7MHz switching - confirmed in the Selector Guide for this exact part number. Its voltage-positioning feedback architecture samples the LX node directly, eliminating phase lag from the output capacitor and enabling stable regulation with only 2.2µF ceramic output capacitance.
This variant uses internal synchronous rectification with pFET/nFET switches (RONP = 0.6–1.2Ω, RONN = 0.35–0.7Ω) and features fast soft-start to suppress inrush current. Shutdown mode reduces supply current to 0.01µA typical while placing LX in high-impedance state, with SHDN requiring ≥10µs low pulse after VIN exceeds UVLO (2.44–2.70V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-preset 1.3V with ±1% initial accuracy at TA = +25°C - eliminates external resistor divider and ensures tight regulation without calibration. |
| Switching Frequency | 3.7MHz (confirmed for MAX8640ZEXT13+) - enables use of 1µH inductor and minimizes PCB footprint while maintaining ultrasonic operation (>20kHz) even at 1mA loads. |
| Max Output Current | 500mA guaranteed - supports core/I/O rails for microprocessors, DSPs, and baseband ICs in handheld devices. |
| Quiescent Current | 28µA typical at no load - 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+ (2.7–4.2V), Li-polymer, and 3.3V/5V system rails. |
| Load Regulation | Voltage-positioning type: ΔVOUT = ILOAD × RDC(inductor) - reduces load-transient overshoot by ~50% vs. conventional buck regulators. |
| Shutdown Current | 0.01µA typical - enables true zero-power standby when disabled via SHDN pin. |
Pinout & Package
MAX8640ZEXT13+ is housed in a lead-free, RoHS-compliant 6-pin SC70 package (2.0mm × 2.1mm), rated for -40°C to +85°C operation with 245mW max power dissipation at +70°C (derating 3.1mW/°C above).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LX) | Inductor switch node | Connects to internal pFET drain and nFET source; carries high di/dt switching current - requires short, wide trace and local ground plane coupling. |
| 2,5 (GND) | Power and signal ground | Two dedicated GND pins must be connected together directly under IC and tied to input/output capacitor grounds to minimize ground bounce and EMI. |
| 3 (OUT) | Output voltage sense | Internally connected to feedback network; bypass with ceramic capacitor placed adjacent to pin 3 and pin 2 - critical for loop stability with 2.2µF output cap. |
| 4 (SHDN) | Active-low enable | Logic-low ≥10µs after VIN rises above UVLO resets internal logic; drives <0.01µA in shutdown - supports simple GPIO or RC-based power sequencing. |
| 6 (IN) | Input power supply | Accepts 2.7–5.5V; requires local 2.2µF ceramic bypass capacitor placed near pin 6 and pin 5 to suppress switching noise and reduce input current spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrasonic pulse-skipping mode | Maintains >20kHz switching frequency down to 1mA load - avoids audible noise in audio-sensitive portable devices without sacrificing light-load efficiency. |
| Voltage-positioning load regulation | ΔVOUT = ILOAD × RDC(L1) - enables predictable, linear output droop during transients and halves peak-to-peak excursion vs. standard buck topologies. |
| Internal synchronous rectification | Replaces external Schottky diode; achieves >90% efficiency at 300mA with 1µH/2.2µF components - reduces BOM count and thermal stress. |
| Fast soft-start | Eliminates inrush current at startup - allows direct connection to high-impedance sources like coin cells or Li+ batteries without oversized input capacitors. |
| Small external component set | Requires only 1µH inductor and 2.2µF output capacitor - enables total solution size <15mm² including passives, ideal for ultra-thin handhelds. |
Applications
| Microprocessor Core Power | I/O Power Supply |
|---|---|
|
Use Scenario: Powering ARM Cortex-M series MCU cores operating at 1.3V with dynamic current draw from 10µA to 400mA. IC Role / Device Role / Timing Role: Primary step-down regulator delivering tightly regulated 1.3V VDD_CORE with fast load-transient response (<40µs settling). Use Value: Voltage-positioning regulation minimizes overshoot during wake-from-sleep transitions, preventing core latch-up or timing violations. |
Use Scenario: Supplying 1.3V I/O banks for FPGA configuration interfaces or USB PHY circuitry in compact PDAs. IC Role / Device Role / Timing Role: Dedicated point-of-load converter providing low-noise, ripple-controlled 1.3V rail decoupled from main system supply. Use Value: 3.7MHz switching and 2.2µF ceramic output cap ensure <10mVpp ripple across 10Hz–1MHz bandwidth - meets USB 2.0 signal integrity requirements. |
| Smartphone Baseband Power | Portable Medical Sensor Node |
|
Use Scenario: Delivering 1.3V to LTE/WCDMA baseband processors during burst transmission (500mA peaks). IC Role / Device Role / Timing Role: High-current, fast-response DC-DC converter synchronized to RF transmit timing to avoid supply sag-induced bit errors. Use Value: 500mA guaranteed output and ultrasonic skip mode maintain stable 1.3V under pulsed loads while avoiding audible coil whine during voice calls. |
Use Scenario: Powering ultra-low-power ECG/PPG sensor ASICs in wearable patches with coin-cell battery (CR2032). IC Role / Device Role / Timing Role: Primary power stage converting 3.0V battery to 1.3V analog/digital domain with minimal quiescent consumption. Use Value: 28µA IQ and 0.01µA shutdown current extend CR2032 life to >12 months in sleep-dominated operation, validated over full -40°C to +85°C range. |
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 |
|---|---|---|---|
| MAX8640YEXT13+T | 2.2µH/4.7µF external components; 1.9MHz switching; 1.3V output; same SC70 package and pinout. | Better efficiency at medium/heavy loads (>100mA); larger inductor/capacitor footprint; not ultrasonic below 100mA. | Select for higher efficiency where board area permits larger passives; avoid if audible noise or minimal footprint is critical. |
| TPS622313DRVR | 1.3V fixed output; 3.6MHz switching; 500mA; 6-pin WSON (2.0mm × 2.0mm); requires external feedback resistors for nonstandard voltages. | Higher max junction temperature (+125°C); different pin assignment (SHDN on pin 5, GND on pin 2/6); no voltage-positioning architecture. | Choose for extended temperature operation or TI-design ecosystem compatibility; verify PCB layout changes due to pinout mismatch and feedback routing. |
Compared with MAX8640YEXT13+T and TPS622313DRVR, the MAX8640ZEXT13+ uniquely combines 3.7MHz operation, voltage-positioning regulation, and ultrasonic light-load behavior in a proven SC70 footprint - making it optimal for space- and noise-sensitive 1.3V core power in portable consumer electronics.
Availability
MAX8640ZEXT13+ is available at Aetrix Electronics and suitable for microprocessor core power, I/O supply, smartphone baseband, and portable medical sensor node applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8640ZEXT13+ 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 demanding industrial, automotive, and portable applications.
The MAX8640Y/MAX8640Z product line delivers ultra-compact, high-frequency synchronous buck converters targeting battery-powered handheld devices where size, efficiency, and low-noise performance are critical design constraints.
FAQ
What is the confirmed switching frequency of MAX8640ZEXT13+?
The MAX8640ZEXT13+ has a confirmed switching frequency of 3.7MHz, as explicitly listed in the Selector Guide table for this exact part number. This enables use of a 1µH inductor and 2.2µF output capacitor while maintaining ultrasonic operation down to 1mA loads - critical for noise-sensitive portable applications.
Does MAX8640ZEXT13+ require external feedback resistors?
No, MAX8640ZEXT13+ does not require external feedback resistors. It features a factory-preset 1.3V output voltage, with the feedback network integrated internally and connected to the OUT pin. This eliminates resistor matching errors and saves PCB area - a key advantage over adjustable buck controllers.
What is the maximum continuous output current for MAX8640ZEXT13+?
The MAX8640ZEXT13+ guarantees 500mA continuous output current across the full -40°C to +85°C operating temperature range. This rating is validated under thermal conditions defined for the SC70 package (245mW max dissipation at +70°C, derating 3.1mW/°C above), ensuring reliable operation in handheld device enclosures.
How does the voltage-positioning load regulation work in MAX8640ZEXT13+?
MAX8640ZEXT13+ implements voltage-positioning load regulation by sampling the LX node instead of the OUT node for feedback. This removes phase lag from the output capacitor, resulting in ΔVOUT = ILOAD × RDC(inductor). The effect is predictable, linear droop during load steps and ~50% reduction in peak-to-peak transient excursion versus conventional buck regulators.
What are the absolute maximum ratings for IN and SHDN pins on MAX8640ZEXT13+?
For MAX8640ZEXT13+, the absolute maximum rating for IN to GND is -0.3V to +6V, and for SHDN to GND it is -0.3V to (VIN + 0.3V). Exceeding these stresses may cause permanent damage. The recommended operating range remains 2.7V to 5.5V for IN and logic-level signals (VIH ≥1.4V, VIL ≤0.4V) for SHDN.
MAX8640ZEXT13+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tube
- 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):
- 1.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 3.7MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
MAX8640ZEXT13+ FAQ
1.How can I place an order for MAX8640ZEXT13+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8640ZEXT13+ 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 MAX8640ZEXT13+ reliable?
The price and inventory of MAX8640ZEXT13+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8640ZEXT13+ is usually 5 days.
3.What payment methods are accepted for MAX8640ZEXT13+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8640ZEXT13+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8640ZEXT13+?
MAX8640ZEXT13+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8640ZEXT13+ 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 MAX8640ZEXT13+?
For technical support, including MAX8640ZEXT13+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8640ZEXT13+ requirements.
6.How does Aetrix verify that MAX8640ZEXT13+ is sourced from the original manufacturer or authorized distributors?
All MAX8640ZEXT13+ 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 MAX8640ZEXT13+ meets industry standards.
7.What is the process for return or replacement of MAX8640ZEXT13+?
All MAX8640ZEXT13+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8640ZEXT13+, 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 MAX8640ZEXT13+ part is unused and in its original packaging.
Return procedure for MAX8640ZEXT13+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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