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Analog Devices Inc./Maxim Integrated MAX684EUA+T
- Part No.:
- MAX684EUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX684EUA+T.pdf
- Description:
- IC REG CHARGE PUMP 5V 50MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,739
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Product details
Overview
MAX684EUA+T from Maxim Integrated is a 50mA fixed-output charge-pump voltage regulator that generates a regulated 5V output from a 2.7V–5.5V input, operating in either skip mode (low quiescent current) or constant-frequency mode (low ripple), housed in an 8-pin µMAX package with 1.1mm height-designed for compact battery-powered applications such as PCMCIA cards and GSM SIMM cards.
For engineers reviewing the MAX684EUA+T datasheet, MAX684EUA+T pinout, MAX684EUA+T application, or MAX684EUA+T equivalent, this page delivers verified technical context, real-world design meaning for each specification, validated pin functions, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The MAX684EUA+T implements a switched-capacitor voltage doubler architecture with internal MOSFET switches, a 1.23V bandgap reference, error amplifier, and dual-mode control logic. Its regulation relies on either pulse-skipping (SKIP = low) for <100µA no-load IQ or continuous switching (SKIP = high) for stable 50kHz–2MHz oscillator frequency set by SHDN bias current.
It features undervoltage lockout (2.25V threshold with 100mV hysteresis), shutdown current of 0.1µA, and output short-circuit protection up to 5 seconds. Power dissipation follows PDISS = IOUT(2VIN − VOUT), with a µMAX package derating of 4.1mW/°C above +70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.05V ±4% - ensures stable logic-level supply for 5V peripherals without external feedback. |
| Max Output Current | 50mA - supports low-power auxiliary rails in miniature equipment and backup-battery boost converters. |
| Input Voltage Range | 2.7V–5.5V (SKIP = high); 2.7V–3.6V (SKIP = low) - enables operation across single Li-ion, 3-cell NiMH, or regulated 3.3V rails. |
| Quiescent Current | 100µA in skip mode - extends battery life in always-on standby circuits like SIM card power supplies. |
| Shutdown Current | 0.1µA - allows deep-sleep states in portable devices without significant leakage drain. |
| Switching Frequency | 50kHz–2MHz (externally adjustable via SHDN bias current) - permits optimization between capacitor size (higher f = smaller C) and EMI profile. |
| Package | 8-pin µMAX (3mm × 3mm × 1.1mm) - fits space-constrained PCBs where SO-8 is too tall or large. |
Pinout & Package
The MAX684EUA+T uses an 8-pin µMAX package (3mm × 3mm × 1.1mm body, 0.65mm pitch), optimized for ultra-low-profile applications requiring minimal board area and height clearance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SKIP | Mode selection input | Logic-controlled switch between skip mode (low IQ, variable ripple) and constant-frequency mode (low ripple, higher light-load loss). |
| 2 - SHDN | Shutdown & frequency control input | Drives device into 0.1µA shutdown when pulled low; sets oscillator frequency via sourced current (1–50µA range). |
| 3 - IN | Main power input | Accepts 2.7V–5.5V (SKIP = high) or 2.7V–3.6V (SKIP = low); requires local 0.47µF ceramic bypass to PGND. |
| 4 - GND | Analog ground reference | Low-impedance return path for error amplifier and reference; must be short-traced to PGND. |
| 5 - PGND | Power ground terminal | High-current return for charge-pump switches; connects directly to input/output capacitor grounds. |
| 6 - CXN | Negative transfer capacitor node | Connects to negative terminal of 0.22µF external flying capacitor (CX); critical for charge transfer timing. |
| 7 - CXP | Positive transfer capacitor node | Connects to positive terminal of CX; forms half-bridge with CXN during voltage doubling cycle. |
| 8 - OUT | Regulated 5V output | Delivers up to 50mA; requires 0.47µF ceramic output capacitor (COUT) for constant-frequency mode stability. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor design | Eliminates magnetic components and EMI concerns-ideal for RF-sensitive handheld devices and dense PCB layouts. |
| 1.1mm µMAX height | Enables integration into sub-2mm-thick modules such as PCMCIA Type II cards and slim SIM adapters. |
| Ultra-small capacitors | Supports 0.22µF CX and 0.47µF COUT in constant-frequency mode-reduces BOM count and board footprint vs. inductor-based solutions. |
| Dual-mode regulation | Allows system-level tradeoff: skip mode for >10-year battery life in backup supplies; constant-frequency for clean 5V rail in flash memory interfaces. |
| Input UVLO with hysteresis | Shuts down cleanly at 2.25V with 100mV hysteresis-prevents brownout oscillation and protects downstream 5V logic during battery depletion. |
Applications
| Flash Memory Supplies | Battery-Powered Applications |
|---|---|
|
Use Scenario: Providing regulated 5V to NAND/NOR flash during programming or erase cycles in portable data loggers. IC Role / Device Role / Timing Role: Auxiliary voltage regulator delivering stable 5V from a 3.3V main rail or single-cell Li-ion source. Use Value: Enables reliable flash operation without inductor-induced noise or layout sensitivity-critical for data integrity in field-deployed units. |
Use Scenario: Powering SIM card interface circuitry in GSM/GPRS modules operating from 3.3V system rails. IC Role / Device Role / Timing Role: 5V SIMM card booster with shutdown control synchronized to modem sleep states. Use Value: Achieves 0.1µA shutdown current and 100µA skip-mode IQ-extending coin-cell or Li-ion runtime by months in intermittent-use devices. |
| PCMCIA Cards | Miniature Equipment |
|
Use Scenario: Generating 5V for legacy PCMCIA Type II peripheral cards inserted into embedded host controllers. IC Role / Device Role / Timing Role: Compact, low-profile charge-pump regulator meeting PCMCIA mechanical height constraints (≤1.1mm). Use Value: Eliminates need for taller SO-8 regulators or external inductors-preserves card thickness compliance while supporting full 5V bus signaling. |
Use Scenario: Supplying 5V to microcontroller peripherals (e.g., USB transceivers, sensors) in wearable medical monitors. IC Role / Device Role / Timing Role: Space-optimized auxiliary regulator co-located near load to minimize trace inductance and noise coupling. Use Value: 3mm × 3mm µMAX footprint and ceramic-only external components simplify routing in high-density flex-rigid PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge-pump regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX683EUA+T | 100mA max output, same µMAX package, identical pinout and control interface. | Supports higher-current loads (e.g., multi-peripheral 5V buses) but draws more quiescent current in skip mode (180µA vs. 100µA). | Select when load exceeds 50mA but board space and height constraints match MAX684EUA+T. |
| TPS60403DBVR | 50mA output, 2.7V–6V input, 1.5MHz fixed frequency, SOT-23-6 package (no SKIP/SHDN dual-function pins). | Lacks skip mode and programmable frequency; requires separate enable/shutdown control and fixed external resistor for regulation. | Choose for cost-sensitive designs where fixed-frequency operation suffices and SOT-23 layout compatibility exists. |
Compared with MAX684EUA+T, MAX683EUA+T offers 2× output current in identical form factor but trades off light-load efficiency, while TPS60403DBVR simplifies control at the expense of regulation flexibility and board-level noise optimization capability.
Availability
MAX684EUA+T is available at Aetrix Electronics and suitable for flash memory supplies, battery-powered applications, and miniature equipment requiring stable component supply, long-lifecycle support, and consistent µMAX packaging.
Supply support for MAX684EUA+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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX682/MAX683/MAX684 family was designed specifically to replace inductor-based DC-DC boost converters in space-constrained, low-noise, battery-operated systems requiring clean 5V auxiliary rails.
FAQ
What is the maximum output current supported by the MAX684EUA+T?
The MAX684EUA+T delivers up to 50mA of continuous output current under typical conditions (TA = +25°C, VIN = 3V). Absolute maximum continuous output current is rated at 75mA, but sustained operation above 50mA may exceed thermal limits in the µMAX package without adequate PCB copper area or airflow.
Can the MAX684EUA+T operate from a 5V input supply?
Yes-the MAX684EUA+T supports input voltages from 2.7V to 5.5V, but only when SKIP is held high. If SKIP is low, the input must remain ≤3.6V. For 5V input operation, SKIP must be tied high to ensure constant-frequency mode and prevent regulation failure.
How does the SHDN pin control both shutdown and switching frequency?
The SHDN pin on the MAX684EUA+T functions as a dual-purpose terminal: pulling it below 0.35V disables all internal circuitry (shutdown mode, 0.1µA IQ), while sourcing 1–50µA into it (via resistor to VIN) sets the oscillator frequency using REXT = 45000(VIN − 0.69V)/fOSC, enabling precise ripple/noise tuning without additional components.
What capacitor values are required for basic operation of the MAX684EUA+T?
For constant-frequency mode (SKIP = high), the MAX684EUA+T requires three external capacitors: 0.22µF for CX (flying cap), 0.47µF for CIN (input bypass), and 0.47µF for COUT (output filter)-all ceramic, low-ESR (<100mΩ). No inductor is needed, and resistor REXT sets frequency via SHDN bias current.
Is the MAX684EUA+T pin-compatible with other devices in the MAX68x family?
Yes-the MAX684EUA+T shares identical pinout, package dimensions, and control interface with MAX683EUA+T and MAX682ESA, allowing drop-in replacement within the same µMAX or SO-8 footprint. However, output current ratings differ (50mA/100mA/250mA), so thermal and load capability must be re-verified per design.
MAX684EUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA
- Frequency - Switching:
- 50kHz ~ 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX684EUA+T FAQ
1.How can I place an order for MAX684EUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX684EUA+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 MAX684EUA+T reliable?
The price and inventory of MAX684EUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX684EUA+T is usually 5 days.
3.What payment methods are accepted for MAX684EUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX684EUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX684EUA+T?
MAX684EUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX684EUA+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 MAX684EUA+T?
For technical support, including MAX684EUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX684EUA+T requirements.
6.How does Aetrix verify that MAX684EUA+T is sourced from the original manufacturer or authorized distributors?
All MAX684EUA+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 MAX684EUA+T meets industry standards.
7.What is the process for return or replacement of MAX684EUA+T?
All MAX684EUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX684EUA+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 MAX684EUA+T part is unused and in its original packaging.
Return procedure for MAX684EUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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