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Analog Devices Inc./Maxim Integrated MAX682ESA+T
- Part No.:
- MAX682ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX682ESA+T.pdf
- Description:
- IC REG CHARG PUMP 5V 250MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,620
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Product details
Overview
MAX682ESA+T from Maxim Integrated is a 5V charge-pump voltage regulator IC designed to generate a regulated 5V output from a 2.7V–5.5V input, delivering up to 250mA output current in constant-frequency mode. It operates in either skip mode (low quiescent current) or constant-frequency mode (low ripple), uses no inductors, and requires only three external capacitors and one resistor. It is commonly used as an auxiliary supply for flash memory, PCMCIA cards, and 3.3V-to-5V local conversion in compact battery-powered systems.
For engineers reviewing the MAX682ESA+T datasheet, MAX682ESA+T pinout, MAX682ESA+T application, or MAX682ESA+T equivalent, key selection criteria include its 5V ±4% regulation accuracy, 50kHz–2MHz adjustable switching frequency via SHDN bias current, 100µA quiescent current in skip mode, and SO-8 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX682ESA+T integrates a 1.23V bandgap reference, error amplifier, oscillator, and high-current MOSFET switches to regulate output using either skip-mode (discontinuous switching) or constant-frequency mode (continuous switching). Its dual-function SHDN pin sets both shutdown state and oscillator frequency via external resistor bias current (1µA–50µA).
Input undervoltage lockout activates below 2.25V with 100mV hysteresis; above 3.6V input, constant-frequency mode is mandatory. The device uses charge-pump topology with CXP/CXN terminals driving an external transfer capacitor, eliminating magnetic components while maintaining tight 5V regulation across load and line variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.05V typical, ±4% tolerance - ensures stable 5V rail for logic-level peripherals without external feedback adjustment. |
| Max Output Current | 250mA at VIN ≥ 3.6V in constant-frequency mode - supports moderate-power digital loads like flash memory or SIM card interfaces. |
| Input Voltage Range | 2.7V–5.5V (SKIP = high); 2.7V–3.6V (SKIP = low) - enables direct use with Li-ion, 3.3V, or 5V supply rails. |
| Switching Frequency | 50kHz–2MHz, set by SHDN bias current - allows tradeoff between capacitor size (higher f → smaller CX/COUT) and EMI/noise profile. |
| Quiescent Current | 100µA in skip mode - extends battery life in standby or low-duty-cycle portable applications. |
| Shutdown Current | 0.1µA max - enables deep power-down in always-on systems requiring ultra-low leakage. |
| Regulation Accuracy | ±4% over -40°C to +85°C - meets industrial-grade stability requirements without trimming or calibration. |
Pinout & Package
MAX682ESA+T is housed in an 8-pin SO (Small Outline) package, 1.75mm height, JEDEC MS-012AC compliant, with standard SOIC footprint and lead spacing (1.27mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SKIP | Mode select input | Logic-low enables skip mode (low IQ); logic-high forces constant-frequency mode (required for VIN > 3.6V). |
| 2 - SHDN | Shutdown & frequency control | Forward-biased diode input; current sourced into SHDN (1–50µA) sets oscillator frequency; <1µA disables operation. |
| 3 - IN | Main power input | Accepts 2.7V–5.5V (SKIP = high) or 2.7V–3.6V (SKIP = low); bypassed to PGND with ≥1µF ceramic capacitor. |
| 4 - GND | Analog ground reference | Low-impedance connection point for signal return; must be short-traced to PGND to minimize noise coupling. |
| 5 - PGND | Power ground | High-current return path for internal MOSFET switches; separate from GND to reduce ground bounce in switching nodes. |
| 6 - CXN | Negative charge-pump node | Connects to negative terminal of external transfer capacitor (CX); forms half of flying-capacitor switching path. |
| 7 - CXP | Positive charge-pump node | Connects to positive terminal of external transfer capacitor (CX); alternately charges/discharges with IN and OUT. |
| 8 - OUT | Regulated 5V output | Delivers up to 250mA; requires ≥2.2µF low-ESR ceramic or tantalum output capacitor for stable regulation. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor design | Eliminates magnetic EMI, board area, and cost associated with inductors - ideal for ultra-thin or RF-sensitive layouts. |
| 1µF/100mA capacitor sizing | Enables use of tiny 1µF input and 0.47µF transfer capacitors at 1MHz, reducing total BOM footprint vs. traditional boost converters. |
| Dual operating modes | Skip mode cuts IQ to 100µA at light loads; constant-frequency mode delivers <100mVpp ripple at full load - selectable per system needs. |
| Integrated UVLO with hysteresis | Shuts down cleanly below 2.25V input and stays off until VIN rises to 2.35V - prevents brownout-induced logic glitches. |
| SO-8 pin-compatible upgrade path | Shares footprint with legacy linear regulators and other Maxim charge pumps - simplifies redesign without layout changes. |
Applications
| Flash Memory Supplies | Battery-Powered Miniature Equipment |
|---|---|
|
Use Scenario: Providing clean 5V VCC to NAND/NOR flash during program/erase cycles in handheld data loggers. IC Role / Device Role / Timing Role: Primary 5V auxiliary supply; regulates against battery droop during high-current pulses. Use Value: Delivers 250mA peak with <100mVpp ripple in constant-frequency mode, ensuring reliable flash write timing and data integrity. |
Use Scenario: Powering microcontroller peripherals and sensors in wearable health monitors powered by single-cell Li-ion. IC Role / Device Role / Timing Role: Efficient 3.3V-to-5V local converter enabling USB interface or display backlight drivers. Use Value: Achieves >85% efficiency at 10mA load in skip mode, extending runtime by minimizing quiescent loss during sleep states. |
| PCMCIA Card Power | 3V-to-5V GSM SIMM Card Supply |
|
Use Scenario: Generating 5V for legacy PCMCIA Type II cards inserted into embedded industrial controllers. IC Role / Device Role / Timing Role: Compact, in-situ 5V regulator replacing bulky discrete solutions on card-edge PCBs. Use Value: SO-8 package fits tight card-edge constraints; 50kHz–2MHz frequency adjustability avoids interference with PCMCIA bus timing. |
Use Scenario: Boosting 3V SIM card supply to 5V for legacy GSM modules in IoT gateways with multi-voltage SIM slots. IC Role / Device Role / Timing Role: Dedicated SIM interface power rail with fast transient response to handle SIM reset pulses. Use Value: Load-transient response settles within 2ms (5mA→250mA step), preventing SIM communication dropouts during activation. |
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+ | Same architecture, 100mA max output, µMAX-8 package (1.1mm height), identical pinout except lower current capability. | Preferred where board height <1.2mm is critical and load current ≤100mA suffices (e.g., low-power sensors). | Select MAX683EUA+ only if space constraints outweigh current requirement; not a drop-in replacement for 250mA loads. |
| TPS60403DBVR | Texas Instruments' 5V charge pump with fixed 500kHz frequency, 60mA output, SOT-23-6 package, no SKIP/SHDN dual-function pins. | Suited for ultra-low-cost, low-current applications where external frequency programming and dual-mode operation are unnecessary. | Choose TPS60403DBVR for cost-sensitive designs with fixed 60mA loads; lacks MAX682ESA+T's flexibility in frequency/load scaling. |
Compared with MAX683EUA+, MAX682ESA+T provides 2.5× higher output current in the same functional family but requires SO-8 layout space; versus TPS60403DBVR, it offers programmable frequency, dual operating modes, and 4× higher current, at the cost of larger package and more complex biasing.
Availability
MAX682ESA+T is available at Aetrix Electronics and suitable for flash memory supplies, battery-powered miniature equipment, and PCMCIA card power applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX682ESA+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 markets.
The MAX682ESA+T belongs to Maxim's charge-pump regulator product line, engineered for compact, inductorless DC-DC conversion in space- and efficiency-critical portable and embedded systems.
FAQ
What is the maximum input voltage supported by the MAX682ESA+T?
The MAX682ESA+T supports an input voltage range of 2.7V to 5.5V when the SKIP pin is held high. However, if SKIP is low, the input voltage must be limited to 2.7V–3.6V to maintain regulation. Exceeding 3.6V with SKIP low risks loss of output regulation, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. Always tie SKIP high for inputs above 3.6V.
How does the SHDN pin control both shutdown and switching frequency in the MAX682ESA+T?
The SHDN pin on the MAX682ESA+T functions as a forward-biased diode to ground. When pulled below ~0.7V (e.g., via resistor to GND), it places the device in shutdown, drawing only 0.1µA. When biased with current between 1µA and 50µA (e.g., via resistor to VIN), that current sets the oscillator frequency using REXT = 45000 × (VIN − 0.69V) / fOSC. This dual role eliminates need for separate frequency-setting and enable pins.
Can the MAX682ESA+T be used to power a 5V USB peripheral from a 3.3V supply?
Yes - the MAX682ESA+T is explicitly designed for 3.3V-to-5V local conversion and delivers up to 250mA at 5V with ±4% regulation. In constant-frequency mode (SKIP = high), it maintains <100mVpp output ripple under full load, meeting USB peripheral noise requirements. External component values from Table 3 (e.g., 0.47µF CX, 1µF CIN, 2.2µF COUT) ensure stable operation at 1MHz switching frequency.
What is the purpose of separate GND and PGND pins on the MAX682ESA+T?
GND serves as the analog reference for the error amplifier and bandgap circuitry, while PGND carries high-current switching return paths for the internal MOSFETs. Separating them minimizes ground bounce and noise coupling from switching transients into sensitive analog blocks. Layout best practice requires short, low-impedance traces connecting both to a common ground plane - not daisy-chaining - to preserve regulation accuracy and transient response.
Does the MAX682ESA+T require external feedback resistors to set the 5V output?
No - the MAX682ESA+T features an internal resistive feedback network and 1.23V bandgap reference, providing a fixed 5V output without external resistors. This simplifies design, improves accuracy (±4% over temperature), and eliminates resistor tolerance drift effects. The output voltage is trimmed at wafer test and guaranteed across the full -40°C to +85°C operating range.
MAX682ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 250mA
- Frequency - Switching:
- 50kHz ~ 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX682ESA+T FAQ
1.How can I place an order for MAX682ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX682ESA+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 MAX682ESA+T reliable?
The price and inventory of MAX682ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX682ESA+T is usually 5 days.
3.What payment methods are accepted for MAX682ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX682ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX682ESA+T?
MAX682ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX682ESA+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 MAX682ESA+T?
For technical support, including MAX682ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX682ESA+T requirements.
6.How does Aetrix verify that MAX682ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX682ESA+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 MAX682ESA+T meets industry standards.
7.What is the process for return or replacement of MAX682ESA+T?
All MAX682ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX682ESA+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 MAX682ESA+T part is unused and in its original packaging.
Return procedure for MAX682ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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