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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:7,759
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Product details
Overview
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 voltage 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 output resistance behavior under varying load and capacitor conditions.
Technical Context
The MAX1682EUK+T implements a two-phase charge-pump topology using on-chip power MOSFET switches to double VIN without inductors. Its fixed 12kHz oscillator drives internal switching synchronized to maximize charge transfer efficiency while minimizing EMI.
Output regulation is unregulated open-loop; VOUT ≈ 2×VIN − (IOUT × ROUT), where ROUT is dominated by switch RDS(on), flying capacitor ESR, and C1/C2 values. Performance is validated across −40°C to +85°C with guaranteed specs including 20Ω typical output resistance and ≤110µA no-load supply current.
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 external regulation. |
| Output Current | 30mA typical - sufficient to drive small LCD panels requiring 5–6V bias at moderate brightness. |
| Oscillator Frequency | 12kHz - low-frequency operation reduces EMI and enables use of cost-effective ceramic capacitors. |
| Conversion Efficiency | ≥98% at light loads - minimizes power loss and thermal rise in battery-powered devices. |
| Quiescent Current | 110µA - extends battery life in always-on or low-duty-cycle portable systems. |
| Output Resistance | 20Ω typical - determines voltage droop: e.g., 100mV drop at 5mA load, critical for stable LCD contrast control. |
| 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 21-0057) with exposed pad not connected internally. The compact 2.9mm × 1.6mm footprint supports high-density PCB layouts in space-limited applications.
| 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 reservoir capacitor C2 and load; sensitive to trace inductance. |
| C1− (Pin 3) | Flying capacitor negative terminal | Switches between GND and IN during charge/discharge phases; requires low-ESR capacitor placement adjacent to IC. |
| IN (Pin 4) | Input supply | Accepts 2.0–5.5V DC; must be bypassed with 0.1µF ceramic capacitor close to Pin 4 and GND. |
| C1+ (Pin 5) | Flying capacitor positive terminal | Switches between IN and OUT; forms charge-transfer path with C1−; routing symmetry critical for balanced switching. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 110µA enables >1-year battery life in intermittent-use PDA backlight circuits. |
| Integrated MOSFET switches | Eliminates need for external discrete switches or driver circuitry-reducing BOM count and layout complexity. |
| Fixed-frequency 12kHz oscillator | Ensures predictable EMI profile and simplifies filtering design versus variable-frequency alternatives. |
| Two-external-capacitor operation | Only C1 (flying) and C2 (reservoir) required-no inductors, diodes, or feedback resistors needed. |
| Guaranteed −40°C to +85°C operation | Validated performance across full industrial temperature range without derating. |
Applications
| Small LCD Panels | Cell Phones |
|---|---|
Use Scenario: Generating 5–6V bias voltage for segment or dot-matrix LCDs in portable medical monitors. IC Role / Device Role / Timing Role: Unregulated voltage-doubling power stage converting 3.3V system rail to LCD VEE/VDD supply. Use Value: Enables direct LCD operation from single Li-ion cell without boost converter complexity or inductor size penalty. | Use Scenario: Providing auxiliary 5.5V supply for camera module flash LED drivers in feature phones. IC Role / Device Role / Timing Role: High-efficiency charge-pump stage delivering stable current-limited output for brief flash pulses. Use Value: Achieves >97% efficiency at 20mA pulse load, minimizing heat generation near sensitive image sensors. |
| Handy-Terminals | PDAs |
Use Scenario: Powering electrophoretic (e-ink) display bias rails in rugged warehouse handhelds. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current voltage doubler supplying segmented e-ink gate drivers. Use Value: 110µA IQ extends operational time between charges during long idle periods typical of inventory scanning. | Use Scenario: Generating 6V LCD VCC supply in legacy Palm OS PDAs powered by dual AA batteries. IC Role / Device Role / Timing Role: Primary voltage-doubling IC in compact 5-pin SOT23 footprint, interfacing directly with 3V system rail. Use Value: Delivers 30mA at <600mV drop-ensuring consistent LCD contrast across full battery discharge curve (2.0–3.2V). |
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), identical pinout and package. | Better suited for applications requiring lower output ripple at light loads due to higher switching frequency. | Select MAX1683EUK+T when lower noise or faster transient response is prioritized over ultra-low IQ. |
| TPS60210DBVR | 3.3V fixed-output, 1MHz switching, integrated regulation, 200mA capability, SOT23-6 package. | Provides regulated output and higher current but requires different layout and feedback components. | Choose TPS60210DBVR only when precise output voltage regulation and >50mA load support are mandatory. |
Compared with MAX1683EUK+T and TPS60210DBVR, the MAX1682EUK+T offers the lowest quiescent current and simplest external component count (two capacitors only), making it optimal for cost-sensitive, battery-life-critical LCD bias applications where unregulated 2×VIN output is acceptable.
Availability
MAX1682EUK+T is available at Aetrix Electronics and suitable for small LCD panels, handheld terminals, and PDA designs requiring stable component supply with guaranteed −40°C to +85°C operation and lead-free compliance.
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 product line was engineered specifically for ultra-compact, low-quiescent-current voltage doubling in battery-powered portable electronics-prioritizing minimal external components, SOT23 integration, and robust operation across wide temperature ranges.
FAQ
What is the minimum input voltage required for MAX1682EUK+T startup?
The MAX1682EUK+T begins oscillation and charge pumping at approximately 1.7V input (guaranteed 2.0V min operating), with startup voltage dropping to ~1.0V once oscillation is established. This allows reliable operation down to end-of-discharge for single-cell alkaline or NiMH batteries. The MAX1682EUK+T datasheet specifies 2.0V as the guaranteed functional minimum across temperature.
Can MAX1682EUK+T drive a 50mA load?
The MAX1682EUK+T is rated for 30mA typical continuous output current with ≤600mV drop at 5mA; absolute maximum output current is 50mA per Absolute Maximum Ratings, but sustained 50mA operation exceeds recommended limits and causes significant voltage droop (>1V) and efficiency loss. For 50mA loads, consider paralleling two MAX1682EUK+T devices or selecting the MAX1683EUK+T with optimized capacitor selection.
Is MAX1682EUK+T pin-compatible with MAX1683EUK+T?
Yes, MAX1682EUK+T and MAX1683EUK+T share identical 5-pin SOT23-5 packaging, pinout, and footprint. They differ only in oscillator frequency (12kHz vs. 35kHz) and associated quiescent current (110µA vs. 145µA), enabling direct substitution where frequency-dependent ripple or efficiency trade-offs are acceptable.
What capacitor values are recommended for MAX1682EUK+T to achieve lowest output resistance?
Per Maxim's datasheet Table 2, 10µF ceramic capacitors for both C1 (flying) and C2 (reservoir) yield 20Ω typical output resistance at 12kHz. Using 3.3µF C1 increases ROUT to 35Ω; smaller values further degrade performance. Low-ESR X7R or NP0 dielectrics from AVX or Matsuo are explicitly recommended to minimize total impedance.
Does MAX1682EUK+T require an input bypass capacitor?
Yes, a 0.1µF ceramic bypass capacitor placed between IN (Pin 4) and GND (Pin 1) is mandatory to suppress switching noise and stabilize the input supply. Without it, the MAX1682EUK+T may exhibit erratic startup, increased output ripple, or degraded efficiency due to supply impedance modulating the internal oscillator and switch drivers.
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:
- 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 (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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