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Texas Instruments LM2682MM
- Part No.:
- LM2682MM
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM2682MM.pdf
- Description:
- IC REG CHRG PUMP INV 10MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,252
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Product details
Overview
LM2682MM from Texas Instruments is a CMOS switched-capacitor voltage inverter that converts +2.0V to +5.5V input into −4.0V to −11.0V negative output via inversion-then-doubling topology, delivering up to 10 mA with 90 Ω typical output impedance and 94% power efficiency at 10 mA, used in LCD contrast biasing and GaAs PA biasing.
For engineers reviewing the LM2682MM datasheet, LM2682MM pinout, LM2682MM application, or LM2682MM equivalent, this device requires three external capacitors, operates at 6 kHz switching frequency, supports −40°C to +85°C ambient range, and is packaged in an 8-pin VSSOP (DGK) with one no-connect pin.
Technical Context
The LM2682MM implements a two-phase charge-pump architecture where internal switches alternate between charging C1/C2 during phase 1 and transferring charge to C3 during phase 2, achieving −2×VIN output. Its oscillator runs at 12–30 kHz, producing a 6–15 kHz switching frequency for low EMI and predictable ripple behavior.
Output regulation relies on external capacitor selection: C1 ≥6 VDC rating, C2/C3 ≥12 VDC rating; output resistance is dominated by switch ON-resistance, capacitor ESR, and 1/(fOSC×C) terms, yielding 90 Ω typical at VIN=5V with 3.3 μF low-ESR ceramics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +2.0V to +5.5V - defines minimum battery voltage support and maximum supply rail compatibility |
| Output Voltage Range | −4.0V to −11.0V - exact inverted-doubled output proportional to input, no regulation |
| Max Output Current | 10 mA - determines usable load capacity before significant voltage droop or thermal derating |
| Switching Frequency | 6 kHz typical - sets capacitor size vs. ripple trade-off and EMI profile |
| Output Impedance | 90 Ω typical at 10 mA - directly impacts load regulation error and dynamic response |
| Power Efficiency | 94% typical at 10 mA - reduces quiescent current draw and thermal load in portable systems |
| Quiescent Current | 150 μA - enables ultra-low-power operation in standby or intermittent-use applications |
Pinout & Package
LM2682MM is housed in an 8-pin Very Small Outline Package (VSSOP) with DGK drawing code, 0.65 mm lead pitch, and RoHS-compliant CU-SN finish. Thermal resistance is 220°C/W (junction-to-ambient), limiting continuous power dissipation to 300 mW at TA ≤85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (C1−) | Capacitor C1 negative terminal | Return node for first flying capacitor; must connect to GND during phase 1, floats during phase 2 |
| 2 (C2+) | Capacitor C2 positive terminal | Charge-transfer node linking C1 and C2; critical path for charge recycling |
| 3 (C2−) | Capacitor C2 negative terminal | Reference node for second flying capacitor; tied to VOUT during phase 2 |
| 4 (VOUT) | Negative output voltage | Delivers regulated-negative output; connects to C3 and load; rated to −11.6V absolute max |
| 5 (GND) | Device ground | Primary reference for all internal logic and switch drivers; must be low-impedance return path |
| 6 (VIN) | Positive input supply | Supplies internal oscillator and switch drivers; accepts 2.0–5.5V with 1V/μs dV/dT limit |
| 7 (C1+) | Capacitor C1 positive terminal | Input-side node of first flying capacitor; connected to VIN during phase 1, to C2+ during phase 2 |
| 8 (NC) | No connection | Internally unconnected; must remain floating-no PCB trace or pull-up/down allowed |
Key Features
| Feature | Design Value |
|---|---|
| Inverts then doubles input voltage | Generates precise −2×VIN output without inductors, enabling compact, low-EMI negative rails |
| 90 Ω typical output impedance | Ensures <5% load regulation error at 10 mA, supporting stable biasing for analog circuits |
| 94% power efficiency at 10 mA | Minimizes heat generation and extends battery life in handheld instrumentation and PDAs |
| 150 μA quiescent current | Permits use in always-on subsystems where standby power budget is sub-200 μA |
| VSSOP-8 package (DGK) | Reduces PCB area by >50% vs. SOIC-8 while maintaining same pinout compatibility for layout reuse |
Applications
| LCD Contrast Biasing | GaAs Power Amplifier Biasing |
|---|---|
Use Scenario: Providing adjustable negative bias voltage to control contrast in monochrome STN or segment LCDs in portable medical devices. IC Role / Device Role / Timing Role: Voltage inverter generating stable −5V to −10V from single 3.3V or 5V supply, with minimal external components. Use Value: Eliminates need for bulky inductors or dual-supply regulators, reducing BOM cost and board space by >40%. | Use Scenario: Supplying gate bias voltage for GaAs FET power amplifiers in 2.4 GHz ISM-band transceivers. IC Role / Device Role / Timing Role: High-efficiency negative rail generator delivering −5V at 5–8 mA with low ripple to maintain amplifier linearity. Use Value: Achieves 94% efficiency and 90 Ω output impedance, ensuring <1% gain drift across temperature and load. |
| Interface Power Supplies | Handheld Instrumentation |
Use Scenario: Generating isolated negative supply for RS-232 or MAX232-compatible level-shifting ICs in battery-powered data loggers. IC Role / Device Role / Timing Role: Compact charge-pump inverter replacing transformer-based or inductor-based solutions in space-constrained designs. Use Value: Enables full-duplex serial communication using only three 3.3 μF ceramic capacitors and no magnetics. | Use Scenario: Powering analog front-end circuitry-including op-amps and ADC references-in portable multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current negative rail source supporting precision measurement subsystems. Use Value: 150 μA operating current and 6 kHz switching frequency minimize interference with sensitive analog signal paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2662MM/NOPB | Same VSSOP-8 package; lower 3.5 kHz switching frequency; 120 Ω typical output impedance; 85% efficiency at 10 mA | Better suited for ultra-low-ripple applications where lower frequency allows larger, lower-ESR capacitors | Select when lower EMI and higher capacitor tolerance are prioritized over efficiency and output current capability |
| MAX680ESA+ | SO-8 package only; 10 kHz switching frequency; 110 Ω output impedance; requires four external capacitors | Offers tighter output voltage accuracy via internal trimming but lacks VSSOP footprint | Choose when SOIC layout compatibility is required and additional capacitor count is acceptable |
Compared with LM2682MM, LM2662MM/NOPB trades 94% → 85% efficiency and higher output impedance for lower EMI, while MAX680ESA+ provides better voltage accuracy at the cost of extra capacitor and incompatible packaging-neither is pin-compatible, requiring layout revision.
Availability
LM2682MM is available at Aetrix Electronics and suitable for LCD biasing, GaAs amplifier biasing, and interface power supplies requiring stable component supply, extended temperature operation, and RoHS-compliant packaging.
Supply support for LM2682MM 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 company headquartered in Dallas, Texas, designing and manufacturing analog, embedded processing, and digital signal processing technologies since 1930.
The LM2682MM belongs to TI's switched-capacitor DC/DC converter product line, engineered specifically for low-noise, inductorless negative voltage generation in portable and space-constrained applications.
FAQ
What is the maximum input voltage the LM2682MM can accept?
The LM2682MM has an absolute maximum input voltage rating of +5.8V, but its specified operating range is +2.0V to +5.5V. Exceeding +5.5V may cause undefined behavior or reduced reliability, and operation above +5.8V risks permanent damage. The LM2682MM is designed for single-cell Li-ion, 3.3V, or 5V system rails, not for industrial 12V inputs.
Does the LM2682MM require external regulation to maintain stable output voltage?
No, the LM2682MM does not include output regulation-it produces an open-loop inverted-doubled output (−2×VIN) whose accuracy depends entirely on input stability and capacitor ESR. For regulated −5V output from +5V, TI recommends pairing the LM2682MM with an op-amp and voltage reference (e.g., LM358 + LM4040-5.0), as shown in Figure 7 of the LM2682MM datasheet.
Can multiple LM2682MM devices be paralleled to increase output current?
Yes, the LM2682MM supports parallel operation: each unit requires its own C1 and C2 flying capacitors, but they can share a single C3 output capacitor. Paralleling two LM2682MM units halves effective output impedance and doubles maximum output current to ~20 mA, as confirmed in the "Paralleling Devices" section of the LM2682MM datasheet.
What is the function of Pin 8 (NC) on the LM2682MM?
Pin 8 is explicitly designated as "No Connection" in the LM2682MM datasheet and must remain unconnected on the PCB. It is internally unbonded and electrically isolated-adding a trace, pull-up, pull-down, or thermal pad to Pin 8 may compromise device reliability or ESD performance. The LM2682MM's functional pins are strictly Pins 1–7.
Is the LM2682MM compatible with ceramic capacitors, and what values are recommended?
Yes, the LM2682MM is optimized for ceramic capacitors: C1 = C2 = C3 = 3.3 μF X7R or better, rated ≥6 VDC (C1) and ≥12 VDC (C2, C3). Ceramic types minimize ESR-related losses and ensure 90 Ω typical output impedance; tantalum or aluminum electrolytics are discouraged due to higher ESR and leakage, which degrade efficiency and ripple performance in the LM2682MM circuit.
LM2682MM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-VSSOP
LM2682MM FAQ
1.How can I place an order for LM2682MM through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2682MM 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 LM2682MM reliable?
The price and inventory of LM2682MM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2682MM is usually 5 days.
3.What payment methods are accepted for LM2682MM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2682MM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2682MM?
LM2682MM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2682MM 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 LM2682MM?
For technical support, including LM2682MM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2682MM requirements.
6.How does Aetrix verify that LM2682MM is sourced from the original manufacturer or authorized distributors?
All LM2682MM 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 LM2682MM meets industry standards.
7.What is the process for return or replacement of LM2682MM?
All LM2682MM units undergo pre-shipment inspection (PSI). If there is an issue with LM2682MM, 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 LM2682MM part is unused and in its original packaging.
Return procedure for LM2682MM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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