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Texas Instruments LM2682M/NOPB
- Part No.:
- LM2682M/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2682M/NOPB.pdf
- Description:
- IC REG CHARG PUMP INV 10MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,546
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Product details
Overview
LM2682M/NOPB from Texas Instruments is a CMOS switched-capacitor voltage inverter that converts +2.0 V to +5.5 V input into −4.0 V to −11.0 V negative output, features 90 Ω typical output impedance, 94% typical power efficiency at 10 mA, and operates at 6 kHz switching frequency. It enables compact, inductorless bias generation for LCD contrast and GaAs amplifier circuits.
For engineers reviewing the LM2682M/NOPB datasheet, LM2682M/NOPB pinout, LM2682M/NOPB application, or LM2682M/NOPB equivalent, this device is selected for low-noise, low-ESR capacitor-based negative rail generation where board space, EMI, and quiescent current (150 μA) are critical constraints in portable instrumentation and interface power supplies.
Technical Context
The LM2682M/NOPB implements a two-phase charge-pump topology with internal MOSFET switches operating at half the oscillator frequency (fOSC = 2fSW), enabling inversion followed by doubling of the input supply. Its architecture relies on three external capacitors (C1, C2, C3) with defined voltage ratings (C1 ≥ 6 V, C2/C3 ≥ 12 V) to achieve stable −2VIN output.
Output resistance (ROUT = 90 Ω typ. at VIN = 5 V, TA = 25°C) is determined by switch ON-resistance, capacitor ESR, and fOSC-dependent reactance. Ripple performance (VRIPPLEP-P) scales linearly with load current and inversely with C3 value and fOSC, making capacitor selection critical for regulation fidelity in regulated converter configurations using op-amp feedback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +2.0 V to +5.5 V - supports single-cell Li-ion, dual-cell alkaline, and 3.3 V/5 V logic rails |
| Output Voltage | −4.0 V to −11.0 V - precisely −2×VIN across full input range, enabling predictable rail generation |
| Switching Frequency | 6 kHz - low-frequency operation minimizes EMI and allows use of low-cost ceramic capacitors |
| Output Impedance | 90 Ω typical - sets maximum load regulation error (e.g., 90 mV drop at 1 mA) and ripple sensitivity |
| Power Efficiency | 94% typical at 10 mA - reduces thermal load and extends battery life in portable systems |
| Quiescent Current | 150 μA - enables always-on bias generation without significant standby drain |
| Ambient Temp Range | −40°C to +85°C - qualified for industrial and extended commercial environments |
Pinout & Package
LM2682M/NOPB is housed in an 8-pin VSSOP package (DGK drawing), measuring 3.0 mm × 3.0 mm × 1.0 mm, with exposed pad not connected internally. The package supports surface-mount reflow per JEDEC Level-1-260°C-UNLIM.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (C1−) | C1 capacitor negative terminal | Connects to ground reference during phase 1; defines pumping node polarity for charge transfer |
| 2 (C2+) | C2 capacitor positive terminal | Node where C2 charges to VIN during phase 1; drives inverted output during phase 2 |
| 3 (C2−) | C2 capacitor negative terminal | Connects to VOUT during phase 2; completes charge transfer path to generate −2VIN |
| 4 (VOUT) | Negative output voltage terminal | Delivers regulated −2VIN; requires low-ESR C3 (≥12 V rating) for ripple suppression |
| 5 (GND) | Device ground reference | Common return for VIN, C1, and control circuitry; must be low-impedance for stability |
| 6 (VIN) | Positive input supply | Accepts 2.0–5.5 V; powers internal oscillator and switches; bypassing recommended |
| 7 (C1+) | C1 capacitor positive terminal | Charges to VIN during phase 1; transfers charge to C2 during phase 2 |
| 8 (NC) | No connection | Internally unconnected; must remain floating-no PCB trace or solder mask required |
Key Features
| Feature | Design Value |
|---|---|
| Inverts then doubles input voltage | Generates precise −2VIN output without inductors, eliminating EMI and size penalties of magnetic solutions |
| 94% power efficiency at 10 mA | Minimizes heat dissipation and extends runtime in battery-powered handheld instruments and PDAs |
| 90 Ω typical output impedance | Enables stable 10 mA sourcing with <100 mV load regulation error under typical conditions |
| 150 μA quiescent current | Supports always-on bias rails in low-power sleep modes without compromising system standby time |
| VSSOP-8 package | 3.0 × 3.0 mm footprint saves >60% board area versus SOIC-8 while maintaining compatibility with standard pick-and-place |
Applications
| LCD Contrast Biasing | GaAs Power Amplifier Biasing |
|---|---|
Use Scenario: Providing adjustable negative bias voltage to optimize contrast ratio in monochrome STN and segment LCD displays. IC Role / Device Role / Timing Role: Voltage inverter generating stable −5 V to −10 V rail from 3.3 V or 5 V main supply. Use Value: Eliminates need for discrete inductor-based converters, reducing BOM cost and layout complexity while meeting display VEE tolerance requirements. | Use Scenario: Supplying gate bias voltage for GaAs FET power amplifiers in RF front-ends of portable radios and test equipment. IC Role / Device Role / Timing Role: High-efficiency negative rail generator delivering low-noise −5 V at up to 10 mA for amplifier turn-on/off control. Use Value: Achieves <10 mV ripple with proper C3 selection, ensuring stable amplifier quiescent point and minimizing AM-to-PM distortion. |
| Interface Power Supplies | Handheld Instrumentation |
Use Scenario: Generating isolated negative supply for RS-232 transceivers or analog front-end op-amps requiring dual-rail operation. IC Role / Device Role / Timing Role: Compact inverter supplying −5 V rail from existing +5 V system bus. Use Value: Enables true bipolar signal swing without transformer isolation or bulky DC/DC modules, supporting miniaturized serial interface designs. | Use Scenario: Providing bias voltage for analog sensors, ADC references, and display drivers in battery-operated multimeters and data loggers. IC Role / Device Role / Timing Role: Low-quiescent-current inverter powering auxiliary rails during measurement cycles and sleep states. Use Value: 150 μA IQ ensures >1-year battery life in devices with infrequent wake-up intervals, while 6 kHz switching avoids audible noise in sensitive audio sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Higher 10 kHz switching frequency; 120 Ω typical ROUT; requires 4.5 V min input | Better ripple performance at light loads due to higher fSW; less suitable below 4.5 V input | Select MAX680ESA+ when input ≥4.5 V and lower output ripple is prioritized over quiescent current |
| ICL7660SIPAZ | Wider −1.5 V to −12 V output range; 170 Ω typical ROUT; 200 μA IQ | Supports lower VIN (1.5 V); higher ROUT limits max load to ~5 mA at tight regulation | Select ICL7660SIPAZ for ultra-low-voltage systems (e.g., single alkaline cell) where 5 mA output suffices |
Compared with MAX680ESA+ and ICL7660SIPAZ, the LM2682M/NOPB delivers superior efficiency (94% vs. ~88–90%) and lower output impedance (90 Ω vs. 120–170 Ω) within its 2.0–5.5 V input window, making it optimal for mid-range portable applications demanding both battery life and load regulation.
Availability
LM2682M/NOPB is available at Aetrix Electronics and suitable for LCD contrast biasing, GaAs amplifier biasing, and interface power supplies requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for LM2682M/NOPB 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and digital signal technologies, with decades of expertise in power management innovation.
The LM2682M/NOPB belongs to TI's switched-capacitor DC/DC converter product line, engineered specifically for compact, low-EMI negative rail generation in space-constrained portable and instrumentation systems.
FAQ
What is the exact output voltage behavior of the LM2682M/NOPB across its input range?
The LM2682M/NOPB generates a precise −2×VIN output: −4.0 V at VIN = +2.0 V, −5.0 V at VIN = +2.5 V, −10.0 V at VIN = +5.0 V, and −11.0 V at VIN = +5.5 V. This linear inversion-doubling relationship holds across the full −40°C to +85°C ambient temperature range, with voltage conversion efficiency specified at 99.9%.
Can the LM2682M/NOPB operate from a 3.3 V supply, and what output does it deliver?
Yes, the LM2682M/NOPB fully supports 3.3 V input and delivers −6.6 V output under nominal conditions. At VIN = 3.3 V, typical output impedance remains 90 Ω, power efficiency is ~93%, and output ripple is maintained below 20 mVP-P with 10 μF/12 V X7R C3 and 3.3 μF/6 V C1/C2.
What capacitor specifications are mandatory for reliable operation of the LM2682M/NOPB?
LM2682M/NOPB requires C1 rated ≥6 V DC (e.g., 3.3 μF X7R), C2 and C3 rated ≥12 V DC (e.g., 10 μF X7R), all with low ESR (<1 Ω). Ceramic capacitors are strongly preferred; electrolytics introduce excessive ESR, degrading efficiency and increasing ripple beyond specification.
Is the NC pin (Pin 8) on the LM2682M/NOPB safe to connect to ground or leave floating?
Pin 8 is a true no-connect terminal with no internal bond wire or circuit connection. It must remain electrically floating-neither grounded nor tied to any net. Connecting it risks unintended leakage paths or assembly defects; TI's packaging documentation confirms no internal functionality or thermal tie.
How does paralleling multiple LM2682M/NOPB devices affect output performance?
Paralleling LM2682M/NOPB units reduces effective output impedance proportionally (e.g., two devices yield ~45 Ω) and increases max output current (e.g., 20 mA for two units), provided each has dedicated C1/C2 and shares one C3. Output voltage accuracy and ripple scale accordingly, preserving the −2VIN relationship across all units.
LM2682M/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Ratiometric
- Output Configuration:
- Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 10mA
- Frequency - Switching:
- 6kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2682M/NOPB FAQ
1.How can I place an order for LM2682M/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2682M/NOPB 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 LM2682M/NOPB reliable?
The price and inventory of LM2682M/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2682M/NOPB is usually 5 days.
3.What payment methods are accepted for LM2682M/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2682M/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2682M/NOPB?
LM2682M/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2682M/NOPB 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 LM2682M/NOPB?
For technical support, including LM2682M/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2682M/NOPB requirements.
6.How does Aetrix verify that LM2682M/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2682M/NOPB 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 LM2682M/NOPB meets industry standards.
7.What is the process for return or replacement of LM2682M/NOPB?
All LM2682M/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2682M/NOPB, 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 LM2682M/NOPB part is unused and in its original packaging.
Return procedure for LM2682M/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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