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Analog Devices Inc./Maxim Integrated MAX684EUA+
- Part No.:
- MAX684EUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX684EUA+.pdf
- Description:
- IC REG CHARGE PUMP 5V 50MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,402
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Product details
Overview
The MAX684EUA+ 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 supply. It operates in either skip mode (low quiescent current) or constant-frequency mode (low ripple), uses only three external capacitors and one resistor, and is housed in an ultra-thin 8-pin µMAX package (1.1mm height). It targets space-constrained battery-powered systems requiring compact 3.3V-to-5V local conversion.
For engineers reviewing the MAX684EUA+ datasheet, MAX684EUA+ pinout, MAX684EUA+ application, or MAX684EUA+ equivalent, this page delivers verified technical context, real-world design meaning for each specification, validated pin functions, confirmed alternative parts with functional tradeoffs, and supply-chain support details specific to OEM and embedded design programs.
Technical Context
The MAX684EUA+ implements a switched-capacitor (charge-pump) topology 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 current or constant-frequency switching (SKIP = high) with externally set oscillator frequency (50kHz–2MHz) via SHDN pin bias current.
It features undervoltage lockout (2.25V threshold with 100mV hysteresis), 0.1µA shutdown current, and power-ground (PGND) separation for noise-sensitive layout. Output regulation is ±4% over load, line, and temperature (–40°C to +85°C), with maximum continuous output current rated at 50mA and short-circuit tolerance up to 5 seconds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% - ensures stable logic-level supply for 5V peripherals without external feedback network. |
| Max Output Current | 50mA continuous - supports low-power flash memory, SIM cards, and microcontroller I/O peripherals. |
| Input Voltage Range | 2.7V–5.5V (SKIP = high); 2.7V–3.6V (SKIP = low) - enables direct use with Li-ion, NiMH, or 3.3V system rails. |
| Quiescent Current | 100µA in skip mode - extends battery life in always-on standby applications like PCMCIA card retention. |
| Shutdown Current | 0.1µA - allows deep-sleep operation in portable devices with zero-load leakage impact. |
| Switching Frequency | 50kHz–2MHz (externally adjustable via SHDN bias current) - permits optimization of capacitor size vs. EMI vs. efficiency. |
| Package | 8-pin µMAX (3mm × 3mm × 1.1mm) - fits high-density PCBs where SO-8 is too tall or large. |
Pinout & Package
MAX684EUA+ is supplied in an 8-pin µMAX package (3mm × 3mm, 1.1mm height), optimized for minimal board area and low profile in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SKIP | Mode select input | Logic-low enables skip mode (ultra-low IQ); logic-high forces constant-frequency mode (required for VIN > 3.6V). |
| 2 - SHDN | Shutdown & frequency control | Drives shutdown when pulled low; sets oscillator frequency via sourced current (1µA–50µA) when biased high through REXT. |
| 3 - IN | Main power input | Accepts 2.7V–5.5V (SKIP = high) or 2.7V–3.6V (SKIP = low); bypassed to PGND with ≥0.47µF ceramic capacitor. |
| 4 - GND | Analog ground reference | Low-impedance return for control circuitry; must be short-traced to PGND to minimize noise coupling. |
| 5 - PGND | Power ground | High-current return path for charge-pump switches; separate from GND to isolate switching noise from sensitive analog blocks. |
| 6 - CXN | Negative terminal of transfer capacitor | Connects to negative side of 0.1µF–0.47µF low-ESR ceramic CX; critical for charge-transfer timing and efficiency. |
| 7 - CXP | Positive terminal of transfer capacitor | Connects to positive side of CX; forms flying capacitor node essential for voltage doubling and regulation. |
| 8 - OUT | Regulated 5V output | Delivers up to 50mA; requires ≥0.47µF ceramic COUT (skip mode) or ≥2.2µF (constant-frequency mode) to meet ripple specs. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components and EMI concerns-ideal for RF-sensitive handheld designs. |
| 1µF capacitor per 100mA output rule | Enables 0.47µF CX and 0.47µF CIN for MAX684EUA+, reducing BOM count and board area by >40% vs. inductor-based solutions. |
| Dual-mode regulation | Skip mode cuts IQ to 100µA at light loads; constant-frequency mode maintains <80mV ripple at 1MHz for noise-sensitive analog circuits. |
| 1.1mm µMAX package | Provides same pinout as MAX683EUA+ but with 30% lower height-critical for ultra-thin modules like GSM SIMM cards. |
| Undervoltage lockout (UVLO) | Shuts down cleanly at VIN < 2.25V (100mV hysteresis), preventing brownout-induced system resets in fading battery conditions. |
Applications
| Flash Memory Supplies | Battery-Powered Miniature Equipment |
|---|---|
|
Use Scenario: Powering 5V NOR/NAND flash in handheld PDAs during write/erase cycles. IC Role / Device Role / Timing Role: Provides clean, regulated 5V auxiliary supply independent of main system rail; handles transient 50mA pulses without droop. Use Value: Enables reliable flash programming using only 0.47µF external capacitors-no inductor footprint or EMI filtering required. |
Use Scenario: Supplying 5V logic for sensors and microcontrollers in wearable health monitors. IC Role / Device Role / Timing Role: Acts as compact 3.3V-to-5V local converter; enters skip mode between sensor readings to conserve battery. Use Value: Delivers 100µA quiescent current and 0.1µA shutdown-extends coin-cell life to >1 year in intermittent-use devices. |
| PCMCIA Card Power | GSM SIMM Card Boost Converter |
|
Use Scenario: Generating 5V for legacy PCMCIA Type II peripheral cards in laptops. IC Role / Device Role / Timing Role: Serves as hot-swap-compatible auxiliary regulator; UVLO prevents malfunction during card insertion/removal. Use Value: Meets PCMCIA 2.0 spec for 5V supply stability while fitting within strict 1.1mm card thickness envelope. |
Use Scenario: Boosting 3V SIM card interface voltage to 5V for legacy GSM handsets. IC Role / Device Role / Timing Role: Functions as dedicated SIMM card boost converter; constant-frequency mode suppresses noise near RF front-end. Use Value: Achieves <80mV ripple at 1MHz with 0.22µF CX and 0.47µF COUT, meeting ETSI radiated emission limits for mobile handsets. |
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+ | 100mA output current, identical µMAX package and pinout, same dual-mode control. | Supports higher-current peripherals (e.g., USB transceivers) but draws more quiescent current in skip mode (180µA vs. 100µA). | Select MAX683EUA+ when load exceeds 50mA but board space and height constraints match MAX684EUA+. |
| TPS60403DBVR | 50mA output, 5.5V input, but uses fixed 500kHz switching and lacks SKIP pin - no skip mode option. | Lower EMI due to fixed frequency, but cannot achieve sub-100µA IQ; requires larger 1µF CX and 2.2µF COUT. | Choose TPS60403DBVR only if constant-frequency operation is mandatory and quiescent current >100µA is acceptable. |
Compared with MAX684EUA+, MAX683EUA+ offers 2× output current in the same footprint but trades off 80µA higher IQ, while TPS60403DBVR sacrifices skip-mode efficiency for deterministic EMI behavior and lacks input-voltage flexibility below 3.6V in constant-frequency mode.
Availability
MAX684EUA+ is available at Aetrix Electronics and suitable for flash memory supplies, battery-powered miniature equipment, PCMCIA cards, and GSM SIMM card boost converters requiring stable component supply across production lifecycles.
Supply support for MAX684EUA+ 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 MAX682/MAX683/MAX684 family was engineered specifically for compact, inductorless 3.3V-to-5V local conversion in space- and power-constrained portable electronics.
FAQ
What is the maximum continuous output current of the MAX684EUA+?
The MAX684EUA+ delivers up to 50mA continuous output current under typical operating conditions (TA = –40°C to +85°C, VIN = 3V, CIN = 0.47µF, COUT = 0.47µF). Absolute maximum rating is 75mA, but sustained operation above 50mA may exceed thermal limits in the 8-pin µMAX package without adequate PCB copper pour.
Can the MAX684EUA+ operate from a 5V input?
Yes, the MAX684EUA+ supports input voltages from 2.7V to 5.5V - but only when SKIP is held high. If SKIP is low, input must be limited to 2.7V–3.6V. For 5V input, SKIP must be tied high to ensure constant-frequency mode operation and prevent regulation failure.
What capacitor values are required for basic operation of the MAX684EUA+?
For skip-mode operation (lowest IQ), use 0.47µF for CX, 0.47µF for CIN, and 0.47µF for COUT (ceramic, <100mΩ ESR). For constant-frequency mode (smallest size, lowest ripple), use 0.22µF CX, 0.22µF CIN, and 0.47µF COUT - all specified in Maxim's Table 3 for MAX684EUA+.
How does the SHDN pin control both shutdown and switching frequency?
The SHDN pin on the MAX684EUA+ has dual functionality: pulling it below 0.35V disables all circuitry (0.1µA shutdown current), while sourcing 1µA–50µA into it (via resistor to VIN) sets oscillator frequency from 50kHz to 2MHz. The formula is REXT(kΩ) = 45000 × (VIN – 0.69V) / fOSC(kHz).
Is the MAX684EUA+ pin-compatible with other devices in the MAX68x family?
Yes, the MAX684EUA+ shares identical 8-pin µMAX pinout and function mapping with MAX683EUA+. Both use the same PCB footprint, allowing drop-in replacement where 50mA output suffices - though MAX683EUA+ supports 100mA and slightly higher quiescent current.
MAX684EUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX684EUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX684EUA+ 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+ reliable?
The price and inventory of MAX684EUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX684EUA+ is usually 5 days.
3.What payment methods are accepted for MAX684EUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX684EUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX684EUA+?
MAX684EUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX684EUA+ 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+?
For technical support, including MAX684EUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX684EUA+ requirements.
6.How does Aetrix verify that MAX684EUA+ is sourced from the original manufacturer or authorized distributors?
All MAX684EUA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX684EUA+?
All MAX684EUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX684EUA+, 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+ part is unused and in its original packaging.
Return procedure for MAX684EUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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