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Texas Instruments LM2682MMX
- Part No.:
- LM2682MMX
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM2682MMX.pdf
- Description:
- IC REG CHRG PUMP INV 10MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,874
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Product details
Overview
LM2682MMX 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, operates at 6 kHz switching frequency, delivers 10 mA output current with 90 Ω typical output impedance, and targets low-power portable systems requiring compact, inductorless bias supplies.
For engineers reviewing the LM2682MMX datasheet, LM2682MMX pinout, LM2682MMX application, or LM2682MMX equivalent, this page provides verified technical context, real-world design implications of its charge-pump architecture, confirmed VSSOP-8 package mapping, and validated alternatives for negative rail generation in space-constrained battery-powered devices.
Technical Context
The LM2682MMX implements a two-phase switched-capacitor topology that first inverts then doubles VIN to produce VOUT = −2×VIN, using three external ceramic capacitors (C1, C2, C3) without magnetic components. Its internal oscillator runs at 12 kHz, driving switches at 6 kHz to minimize EMI while maintaining >90% power efficiency at 10 mA load.
It features built-in protection against overvoltage (−11.6 V absolute max VOUT), continuous short-circuit tolerance, and operates across −40°C to +85°C ambient temperature. Output impedance is dominated by switch RON, capacitor ESR, and 1/(fOSC×C) terms-making low-ESR 3.3 μF capacitors critical to achieving the specified 90 Ω typical ROUT.
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, or regulated 3.3 V/5 V rails |
| Output Voltage | −2×VIN (e.g., −5.0 V from +2.5 V) - fixed inversion-doubling ratio, no regulation loop |
| Switching Frequency | 6 kHz - enables use of small, low-cost ceramic capacitors; reduces EMI vs. higher-frequency pumps |
| Output Current | 10 mA - sufficient for LCD bias, GaAs PA gate control, or interface level-shifting loads |
| Output Impedance | 90 Ω typical at VIN = 5 V - determines load-induced voltage droop; impacts ripple and regulation under dynamic load |
| Quiescent Current | 150 μA - enables multi-year battery life in always-on instrumentation or handheld devices |
| Power Efficiency | 94% typical at 10 mA - minimizes heat rise in sealed enclosures and extends runtime |
Pinout & Package
LM2682MMX is packaged in an 8-pin VSSOP (DGK) with 0.65 mm pitch, 3.0 mm × 3.0 mm body, and exposed thermal pad (not electrically connected). The package supports automated placement and reflow per JEDEC Level-1 moisture sensitivity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (C1−) | C1 capacitor negative terminal | Connects to ground side of flying capacitor C1; must be low-inductance path to GND |
| 2 (C2+) | C2 capacitor positive terminal | Node where C2 charges to VIN during phase 1; ties to C1+ and VOUT via internal switches |
| 3 (C2−) | C2 capacitor negative terminal | Connects to GND during phase 1; forms charge transfer path with C1 and C2 |
| 4 (VOUT) | Negative output voltage | Delivers −2×VIN; requires local 3.3–10 μF low-ESR ceramic output capacitor (C3) |
| 5 (GND) | Device ground reference | Primary return path for all internal switches and external capacitors; must be low-impedance plane |
| 6 (VIN) | Positive input supply | Accepts 2.0–5.5 V; bypass with 0.1 μF ceramic close to pin to suppress switching noise |
| 7 (C1+) | C1 capacitor positive terminal | Node where C1 charges to VIN during phase 1; connects to C2+ and VOUT in phase 2 |
| 8 (NC) | No connection | Internally unconnected; leave floating-no PCB trace or solder mask opening required |
Key Features
| Feature | Design Value |
|---|---|
| Inverts then doubles input voltage | Generates precise −2×VIN output without external feedback or regulation circuitry |
| 90 Ω typical output impedance | Enables stable −5 V output under 5 mA load with <50 mV droop; simplifies output filtering |
| 94% typical power efficiency at 10 mA | Reduces thermal load in dense layouts and extends battery life in portable instruments |
| VSSOP-8 package | 3.0 mm × 3.0 mm footprint saves >60% board area vs. SOIC-8; compatible with fine-pitch assembly |
| 150 μA quiescent current | Allows integration into always-on subsystems (e.g., RTC bias, sensor wake-up circuits) without significant standby drain |
Applications
| LCD Contrast Biasing | GaAs Power Amplifier Biasing |
|---|---|
Use Scenario: Providing adjustable negative bias voltage to optimize contrast in monochrome STN or segment LCD displays in handheld meters and medical devices. IC Role / Device Role / Timing Role: Charge-pump inverter generating stable −3 V to −8 V rail from main 3.3 V supply; no timing control required beyond internal 6 kHz oscillator. Use Value: Eliminates need for bulky inductors and associated EMI filters; enables ultra-thin display modules with <1 mm profile. | Use Scenario: Supplying gate bias voltage for GaAs FET power amplifiers in UHF RFID readers and portable wireless transceivers. IC Role / Device Role / Timing Role: Negative rail generator delivering −5 V at up to 10 mA with low output impedance to maintain amplifier linearity under RF load modulation. Use Value: Achieves <100 mV load regulation error across 1–10 mA, ensuring consistent PA gain and minimizing distortion in burst-mode transmission. |
| Interface Power Supplies | Handheld Instrumentation |
Use Scenario: Generating isolated negative supply for RS-232 or MAX232-compatible level shifters in battery-powered data loggers and field testers. IC Role / Device Role / Timing Role: Compact DC/DC inverter replacing discrete charge-pump ICs or transformer-based solutions; operates from same 3.3 V system rail. Use Value: Supports ±5 V or ±10 V interface compliance with <200 mV ripple at 1 mA load, meeting TIA-232-F slew rate requirements. | Use Scenario: Powering analog front-end bias networks, op-amp dual rails, and sensor excitation in portable multimeters and thermal imagers. IC Role / Device Role / Timing Role: Low-quiescent, high-efficiency negative rail source enabling >500-hour battery life on two AA cells while supporting 12-bit ADC reference stability. Use Value: Delivers −5 V at 5 mA with <1.5 mV/mA load regulation, reducing offset drift in precision instrumentation amplifiers. |
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+ | Fixed −5 V output (not scalable); 10 kHz switching; 120 Ω output impedance; SO8 only | Requires fixed −5 V; less flexible for variable VIN systems; higher ROUT increases load droop | Select when exact −5 V is required and board space allows SOIC; avoid if scaling across 2.0–5.5 V inputs is needed |
| TPS60403DBVR | Adjustable output (−1.5 V to −5.5 V); 250 kHz switching; 170 Ω output impedance; integrated soft-start | Supports programmable output but with higher noise and lower efficiency (85% typ.); VSSOP-5 package | Choose when output voltage tuning is mandatory and higher ripple is acceptable; verify layout for 250 kHz EMI mitigation |
Compared with MAX680ESA+ and TPS60403DBVR, the LM2682MMX offers superior output impedance (90 Ω vs. ≥120 Ω) and wider input range (2.0–5.5 V vs. 4.5–5.5 V or 1.6–5.5 V), making it optimal for scalable negative rail generation in compact, battery-sensitive designs where predictable load regulation is critical.
Availability
LM2682MMX is available at Aetrix Electronics and suitable for LCD biasing, GaAs amplifier gate control, and portable interface power supplies requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for LM2682MMX 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 LM2682 product line delivers compact, inductorless voltage inversion for portable and space-constrained systems-designed specifically to replace bulky transformer-based or discrete charge-pump solutions in handheld, medical, and instrumentation applications.
FAQ
What is the exact output voltage behavior of the LM2682MMX?
The LM2682MMX generates a nominal output voltage of VOUT = −2×VIN, with no internal regulation. For example, with VIN = 2.5 V, VOUT ≈ −5.0 V; with VIN = 5.0 V, VOUT ≈ −10.0 V. Actual output varies with load, capacitor ESR, and temperature-typical deviation is ±3% at 10 mA with 3.3 μF low-ESR ceramics. The LM2682MMX does not include feedback or trimming, so external regulation (e.g., op-amp + reference) is required for tight tolerance.
Can the LM2682MMX operate from a 2.0 V supply?
Yes, the LM2682MMX is fully specified to operate from VIN = 2.0 V to +5.5 V. At 2.0 V input, it delivers approximately −4.0 V output with ≥5 mA capability and maintains >90% efficiency. Startup is guaranteed down to 2.0 V, and quiescent current remains near 150 μA-making it suitable for single-cell lithium or NiMH systems where brownout margin is critical.
What capacitor values and types are required for stable LM2682MMX operation?
The LM2682MMX requires three external ceramic capacitors: C1 and C2 (3.3 μF, X7R or better, 6 V or 12 V rating respectively), and C3 (3.3–10 μF, 12 V rating, low-ESR ≤100 mΩ). TI specifies 3.3 μF as optimal for 10 mA output with minimal ripple. Using smaller values (e.g., 1 μF) increases output impedance and ripple; aluminum electrolytics are not recommended due to high ESR and aging effects.
Is the LM2682MMX pin-compatible with the LM2682MM/NOPB or SOIC-8 variants?
No-the LM2682MMX uses the VSSOP-8 (DGK) package, while the SOIC-8 variant has different pin spacing (1.27 mm vs. 0.65 mm) and footprint. Although both share identical pin functions and numbering (C1−, C2+, etc.), the LM2682MMX is not mechanically or solder-reflow compatible with SOIC-8 layouts. Board redesign is required to migrate between packages; however, schematic connectivity remains identical.
Does the LM2682MMX support paralleling for higher output current?
Yes, multiple LM2682MMX units can be paralleled to increase output current and reduce effective output impedance. Each device requires its own C1 and C2 pumping capacitors, but a single shared C3 output capacitor suffices. With two LM2682MMX devices, maximum output current scales to ~20 mA and ROUT halves to ~45 Ω-enabling improved load regulation in high-current bias applications without changing external component count significantly.
LM2682MMX 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
LM2682MMX FAQ
1.How can I place an order for LM2682MMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2682MMX 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 LM2682MMX reliable?
The price and inventory of LM2682MMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2682MMX is usually 5 days.
3.What payment methods are accepted for LM2682MMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2682MMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2682MMX?
LM2682MMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2682MMX 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 LM2682MMX?
For technical support, including LM2682MMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2682MMX requirements.
6.How does Aetrix verify that LM2682MMX is sourced from the original manufacturer or authorized distributors?
All LM2682MMX 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 LM2682MMX meets industry standards.
7.What is the process for return or replacement of LM2682MMX?
All LM2682MMX units undergo pre-shipment inspection (PSI). If there is an issue with LM2682MMX, 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 LM2682MMX part is unused and in its original packaging.
Return procedure for LM2682MMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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