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Analog Devices Inc./Maxim Integrated MAX1682EUK
- Part No.:
- MAX1682EUK
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX1682EUK.pdf
- Description:
- IC REG CHARGE PUMP 2VIN SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,790
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Product details
Overview
MAX1682EUK from Maxim Integrated is a monolithic CMOS switched-capacitor voltage doubler IC designed for low-power, space-constrained applications. It accepts 2.0V–5.5V input, delivers up to 30mA output with ≤600mV drop at 30mA, operates at 12kHz, and achieves ≥98% voltage-conversion efficiency - enabling compact LCD bias generation in handheld PDAs.
For engineers reviewing the MAX1682EUK datasheet, MAX1682EUK pinout, MAX1682EUK application, or MAX1682EUK equivalent, key selection criteria include its SOT23-5 footprint, 110µA quiescent current, guaranteed -40°C to +85°C operation, and dual-capacitor external component requirement.
Technical Context
The MAX1682EUK integrates oscillator control circuitry and four on-chip power MOSFET switches to implement a two-phase charge-pump topology. Its fixed 12kHz switching frequency balances ripple suppression and capacitor size, while internal switch resistance and flying/output capacitor ESR jointly determine output impedance (~20Ω typical).
It functions as a non-isolated, fixed-ratio (2×) DC-DC converter with no inductor required. Output voltage regulation is unregulated - VOUT ≈ 2 × VIN − (IOUT × ROUT) - making it suitable for loads tolerant of droop, such as LCD segment drivers and analog front-end bias rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +2.0V to +5.5V - supports single-cell Li-ion, NiMH, or alkaline battery inputs without pre-regulation. |
| Output Current Capability | 30mA typical - sufficient for small LCD panels and low-power analog circuitry. |
| Oscillator Frequency | 12kHz - enables use of low-ESR ceramic capacitors ≥3.3µF while limiting switching losses. |
| Voltage Conversion Efficiency | ≥98% at light-to-moderate load - minimizes thermal rise and extends battery life in portable systems. |
| Quiescent Supply Current | 110µA - ensures minimal standby drain in always-on or intermittent-use devices. |
| Operating Temperature Range | -40°C to +85°C - qualified for industrial and consumer handheld environments. |
| Output Resistance | ~20Ω - defines voltage droop under load (e.g., 600mV drop at 30mA), critical for output stability margining. |
Pinout & Package
MAX1682EUK is housed in a RoHS-compliant 5-pin SOT23-5 package (top mark: ACCL), with exposed pad not connected internally. The package supports surface-mount reflow assembly and occupies <1.6mm² PCB area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Primary return path for all internal switches and output current; must connect to low-impedance ground plane. |
| 2 OUT | Doubled output voltage node | Delivers ~2×VIN; connects directly to reservoir capacitor C2 and load; sensitive to trace inductance. |
| 3 C1− | Flying capacitor negative terminal | Switches between GND and IN during charge/discharge phases; requires low-ESR ceramic capacitor. |
| 4 IN | Input supply voltage | Accepts 2.0V–5.5V; bypass with 0.1µF ceramic capacitor near pin to suppress switching noise. |
| 5 C1+ | Flying capacitor positive terminal | Switches between IN and OUT; forms charge-transfer path with C1−; matched layout critical for efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small 5-pin SOT23-5 footprint | Enables integration into space-limited portable designs where board area is constrained below 2mm². |
| Only two external capacitors required | Eliminates inductors and complex feedback networks - reduces BOM count, cost, and layout complexity. |
| High conversion efficiency (>98%) | Minimizes power loss and heat generation in sealed or thermally restricted enclosures. |
| Low quiescent current (110µA) | Extends battery runtime in always-on or low-duty-cycle applications such as PDA backlight controllers. |
| Guaranteed operation down to 1V input (note 2) | Supports brown-out recovery and deep discharge battery usage without latch-up or malfunction. |
Applications
| Small LCD Panels | Cell Phones |
|---|---|
Use Scenario: Generating 5–6V bias for segment or backplane drive in monochrome STN or FSTN LCD modules. IC Role / Device Role / Timing Role: Fixed-ratio voltage doubler providing stable, low-noise high-side rail independent of main system supply. Use Value: Enables direct battery-powered LCD operation without dedicated boost regulator IC or transformer-based solution. | Use Scenario: Supplying auxiliary voltage for camera module analog front-end or RF power amplifier bias sequencing. IC Role / Device Role / Timing Role: Compact, low-quiescent supplemental rail generator supporting burst-mode operation. Use Value: Reduces bill-of-materials by replacing discrete charge-pump circuits with a single monolithic IC. |
| Handy-Terminals | PDAs |
Use Scenario: Powering touch-screen controller reference voltage or EEPROM programming voltage in ruggedized field terminals. IC Role / Device Role / Timing Role: Reliable, temperature-stable voltage multiplier operating across full industrial temperature range. Use Value: Ensures consistent performance in variable ambient conditions without thermal derating or external compensation. | Use Scenario: Providing 6V supply for LCD contrast adjustment or flash memory programming in legacy PDA platforms. IC Role / Device Role / Timing Role: Low-noise, capacitor-only DC-DC stage integrated into tight-layout mainboard designs. Use Value: Achieves >98% efficiency at 110µA IQ - critical for multi-day battery life in always-on user interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-doubler applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1683EUK | 35kHz oscillator frequency vs. 12kHz; higher ripple but smaller flying capacitor (3.3µF vs. 10µF) possible. | Better suited for ultra-compact layouts where capacitor size dominates; less optimal for low-ripple analog bias rails. | Select MAX1683EUK when minimizing board area is prioritized over output voltage stability under varying load. |
| TPS60230RGTR | 3MHz switching frequency; integrated soft-start; 90% typical efficiency; 25mA output; 6-pin QFN package. | Higher-frequency operation enables smaller 1µF flying capacitor; includes enable and power-good signals. | Choose TPS60230RGTR when system-level control (enable, PG) and tighter output regulation are required over raw efficiency. |
Compared with MAX1683EUK and TPS60230RGTR, the MAX1682EUK offers superior efficiency and lower quiescent current at the expense of larger external capacitance and absence of digital control features - making it optimal for simple, high-efficiency, low-IQ voltage doubling where minimal BOM and proven reliability are paramount.
Availability
MAX1682EUK is available at Aetrix Electronics and suitable for small LCD panels, cell phones, handy-terminals, and PDAs requiring stable component supply with guaranteed -40°C to +85°C operation and lead-free compliance.
Supply support for MAX1682EUK 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX1682/MAX1683 product line was engineered specifically for ultra-compact, low-quiescent, capacitor-based voltage doubling in battery-powered portable electronics - emphasizing minimal external components, high efficiency, and robust thermal performance.
FAQ
What is the maximum continuous output current specification for MAX1682EUK?
The MAX1682EUK is specified to deliver 30mA continuously with a typical voltage drop of 600mV at that load. Absolute maximum output current is rated at 50mA, but sustained operation above 30mA may exceed thermal limits in the SOT23-5 package without adequate PCB copper area. Derating is recommended above 25°C ambient.
Does MAX1682EUK require an external feedback network or regulation loop?
No, the MAX1682EUK is an unregulated fixed-ratio charge pump - it does not include feedback, error amplifiers, or regulation circuitry. Its output voltage follows VOUT ≈ 2 × VIN − (IOUT × ROUT), so design margining must account for input variation, load current, and output resistance. No external resistors or compensation components are needed.
What are the recommended capacitor types and values for MAX1682EUK?
For optimal performance, use X7R or X5R ceramic capacitors: C1 (flying) = 10µF, C2 (output) = 10µF, both rated ≥10V. Low-ESR is critical - AVX TPS series or Matsuo X7R MLCCs are explicitly recommended. Smaller values (e.g., 3.3µF) increase output resistance and ripple; tantalum or electrolytic capacitors are not recommended due to higher ESR.
Can MAX1682EUK operate below its specified 2.0V minimum input voltage?
Yes - per Note 2 in the datasheet, the MAX1682EUK can operate down to 1V once started, though startup requires ≥2.0V. This enables brown-out recovery in battery-powered systems where voltage sags temporarily below nominal, provided the device remains powered and does not fully reset.
Is MAX1682EUK pin-compatible with MAX1683EUK?
Yes, MAX1682EUK and MAX1683EUK share identical pinout, package (SOT23-5), and terminal functions - they are functionally interchangeable at the board level. However, their oscillator frequencies differ (12kHz vs. 35kHz), affecting capacitor selection, ripple, and efficiency trade-offs; no PCB changes are required for substitution, but system-level validation is advised.
MAX1682EUK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 45mA
- Frequency - Switching:
- 12kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX1682EUK FAQ
1.How can I place an order for MAX1682EUK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1682EUK 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 MAX1682EUK reliable?
The price and inventory of MAX1682EUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1682EUK is usually 5 days.
3.What payment methods are accepted for MAX1682EUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1682EUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1682EUK?
MAX1682EUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1682EUK 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 MAX1682EUK?
For technical support, including MAX1682EUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1682EUK requirements.
6.How does Aetrix verify that MAX1682EUK is sourced from the original manufacturer or authorized distributors?
All MAX1682EUK 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 MAX1682EUK meets industry standards.
7.What is the process for return or replacement of MAX1682EUK?
All MAX1682EUK units undergo pre-shipment inspection (PSI). If there is an issue with MAX1682EUK, 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 MAX1682EUK part is unused and in its original packaging.
Return procedure for MAX1682EUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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