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Analog Devices Inc./Maxim Integrated MAX1682EUK-T
- Part No.:
- MAX1682EUK-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX1682EUK-T.pdf
- Description:
- IC REG CHARGE PUMP 2VIN SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,526
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Product details
Overview
The MAX1682EUK-T 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 5mA load, operates at 12kHz, and achieves >98% conversion efficiency-ideal for powering LCD bias in handheld PDAs.
For engineers reviewing the MAX1682EUK-T datasheet, MAX1682EUK-T pinout, MAX1682EUK-T application, or MAX1682EUK-T equivalent, key selection criteria include input voltage range, quiescent current (110µA), SOT23-5 footprint compatibility, oscillator frequency stability over temperature, and verified 2× voltage gain under real load conditions.
Technical Context
The MAX1682EUK-T implements a two-phase charge-pump topology using on-chip power MOSFET switches and an integrated oscillator. Its fixed 12kHz switching frequency balances ripple suppression and capacitor size, while internal switch resistance and external flying/output capacitor ESR jointly determine output impedance (~20Ω typical).
It requires only two external capacitors: a flying capacitor (C1) between C1+ and C1− pins, and a reservoir capacitor (C2) between OUT and GND. The device starts operation down to 1V input (per Note 2), but guaranteed operation begins at 2.0V across −40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +2.0V to +5.5V - supports single-cell Li-ion, alkaline, or NiMH battery inputs without regulation. |
| Output Current | 30mA typical - sufficient to drive small LCD panels requiring ~5–6V bias at moderate brightness. |
| Quiescent Current | 110µA at TA = +25°C - enables multi-year battery life in always-on portable devices. |
| Oscillator Frequency | 12kHz ±25% - fixed-frequency operation simplifies EMI filtering and avoids audible noise in audio-sensitive designs. |
| Voltage Conversion Efficiency | ≥98% at light loads - minimizes thermal rise and extends battery runtime in energy-critical systems. |
| Output Resistance | ~20Ω (VIN = 5V, C1 = C2 = 10µF) - defines VOUT droop: e.g., 100mV drop at 5mA load. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and consumer handheld environments. |
Pinout & Package
MAX1682EUK-T is housed in a RoHS-compliant 5-pin SOT23-5 package (outline no. 21-0057), with exposed pad not electrically connected. Pin 1 is marked by a dot or beveled edge; top mark is "ACCL".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary return path for all internal switches and output current; must connect to low-impedance ground plane. |
| OUT (Pin 2) | Doubled output node | Delivers ~2×VIN; connects directly to C2 (reservoir capacitor) and load; output impedance dominates voltage regulation. |
| C1− (Pin 3) | Flying capacitor negative terminal | Switches between GND and VIN during charge/discharge phases; critical for charge transfer timing and ESR sensitivity. |
| IN (Pin 4) | Input supply | Accepts unregulated 2.0–5.5V; requires local 0.1µF bypass capacitor to suppress switching noise injection. |
| C1+ (Pin 5) | Flying capacitor positive terminal | Switches between IN and OUT; forms charge-transfer loop with C1−; layout symmetry minimizes parasitic inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SOT23-5 footprint | Enables integration into <5mm² PCB area-critical for ultra-portable PDA and handset display modules. |
| Two-capacitor operation | Eliminates need for inductors or transformers, reducing BOM cost and enabling fully ceramic solutions with zero magnetic emissions. |
| High conversion efficiency | ≥98% at 1mA load ensures minimal power loss in battery-powered systems where every µA counts. |
| Low quiescent current | 110µA supply current allows use in always-on subsystems without compromising host system standby time. |
| Guaranteed start-up at 2.0V | Ensures reliable operation across full battery discharge curve of single-cell alkaline or LiFePO₄ sources. |
Applications
| Small LCD Panels | Cell Phones |
|---|---|
Use Scenario: Generating 5–6V bias voltage for segment or dot-matrix LCDs in compact medical monitors or barcode scanners. IC Role / Device Role / Timing Role: Voltage-doubling charge pump providing regulated high-impedance DC bias without inductor-based DC/DC. Use Value: Enables use of low-cost, low-profile ceramic capacitors instead of bulky inductors-reducing height and EMI risk. | Use Scenario: Supplying auxiliary voltage for camera module LCD viewfinders or keypad backlight drivers in legacy GSM handsets. IC Role / Device Role / Timing Role: Standby-capable voltage booster operating from main 3.3V rail to deliver stable 6.6V output. Use Value: 110µA quiescent current preserves battery life during idle periods while maintaining instant-on capability. |
| Handheld Terminals | PDAs |
Use Scenario: Powering contrast-adjustable monochrome LCDs in ruggedized inventory scanners used in warehouses. IC Role / Device Role / Timing Role: Primary voltage doubler supporting wide input range (2.0–5.5V) to accommodate varying battery chemistries and states of charge. Use Value: Guaranteed −40°C to +85°C operation ensures reliability in uncontrolled ambient environments like loading docks. | Use Scenario: Providing 6V supply to active-matrix LCD controllers in early-generation personal digital assistants. IC Role / Device Role / Timing Role: Compact, low-noise voltage multiplier replacing discrete charge-pump circuits with higher component count. Use Value: 12kHz fixed frequency avoids audible noise in close-proximity user interfaces and simplifies filtering design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-doubling applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1683EUK-T | 35kHz oscillator frequency, higher no-load current (145µA), same SOT23-5 package and pinout. | Better ripple performance at light loads due to higher frequency; less suitable for ultra-low-quiescent designs. | Select MAX1683EUK-T when lower output voltage ripple is prioritized over minimum standby current. |
| TPS60230RGTR | TI device with 1MHz switching, integrated soft-start, 25µA quiescent current, but requires three external capacitors. | Superior efficiency at medium loads (>10mA); different pinout and control architecture limits direct substitution. | Choose TPS60230RGTR for new designs needing lower ripple, higher output current (up to 60mA), or tighter regulation via feedback. |
Compared with MAX1683EUK-T and TPS60230RGTR, the MAX1682EUK-T offers the lowest quiescent current among SOT23-5 voltage doublers and simplest two-capacitor implementation-making it optimal for cost-sensitive, battery-limited applications where 12kHz ripple is acceptable.
Availability
MAX1682EUK-T is available at Aetrix Electronics and suitable for small LCD panels, handheld terminals, and PDAs requiring stable component supply with long lifecycle support and consistent parametric performance.
Supply support for MAX1682EUK-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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer markets.
The MAX1682/MAX1683 family was designed specifically for ultra-compact, low-quiescent voltage doubling in battery-powered portable displays-prioritizing minimal external components, robust temperature operation, and predictable output impedance.
FAQ
What is the minimum input voltage required for the MAX1682EUK-T to start switching?
The MAX1682EUK-T typically begins oscillation at 1V input (per Note 2 in the datasheet), but its guaranteed functional operation starts at 2.0V across the full −40°C to +85°C temperature range. Below 2.0V, output regulation and current capability are not specified, and startup may be inconsistent depending on load and capacitor values.
Can the MAX1682EUK-T be used to generate voltages higher than 2×VIN?
No-the MAX1682EUK-T is a dedicated 2× voltage doubler and does not support adjustable or programmable gain. However, multiple MAX1682EUK-T units can be cascaded: two stages yield ~3×VIN (e.g., 3×3.3V ≈ 9.9V), though output resistance increases to ~60Ω and efficiency drops due to cumulative losses.
What are the recommended capacitor types and values for optimal performance with the MAX1682EUK-T?
For lowest output resistance, use 10µF X7R ceramic capacitors for both C1 (flying) and C2 (output), as specified in Table 2 of the datasheet. Low-ESR tantalum (e.g., AVX TPS series) is also acceptable. Avoid high-ESR electrolytics; C1 must be rated for ≥6.3V, C2 for ≥10V to handle peak output voltage.
Is the MAX1682EUK-T pin-compatible with the MAX1683EUK-T?
Yes-the MAX1682EUK-T and MAX1683EUK-T share identical SOT23-5 packaging, pinout, and terminal functions. They differ only in oscillator frequency (12kHz vs. 35kHz) and associated parameters like no-load current and ripple performance; no PCB changes are required when substituting one for the other in existing layouts.
Does the MAX1682EUK-T require any external feedback or enable circuitry to operate?
No-the MAX1682EUK-T is a self-contained charge-pump IC with no enable pin, feedback input, or external control signals. It begins operating automatically when valid input voltage is applied to the IN pin and appropriate external capacitors (C1 and C2) are connected. No additional support circuitry is needed beyond the two capacitors and input bypass.
MAX1682EUK-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX1682EUK-T FAQ
1.How can I place an order for MAX1682EUK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1682EUK-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 MAX1682EUK-T reliable?
The price and inventory of MAX1682EUK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1682EUK-T is usually 5 days.
3.What payment methods are accepted for MAX1682EUK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1682EUK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1682EUK-T?
MAX1682EUK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1682EUK-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 MAX1682EUK-T?
For technical support, including MAX1682EUK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1682EUK-T requirements.
6.How does Aetrix verify that MAX1682EUK-T is sourced from the original manufacturer or authorized distributors?
All MAX1682EUK-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 MAX1682EUK-T meets industry standards.
7.What is the process for return or replacement of MAX1682EUK-T?
All MAX1682EUK-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1682EUK-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 MAX1682EUK-T part is unused and in its original packaging.
Return procedure for MAX1682EUK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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