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Texas Instruments LM2681M6X/NOPB
- Part No.:
- LM2681M6X/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6
- Datasheet:
-
LM2681M6X/NOPB.pdf
- Description:
- IC REG CHARGE PUMP 2VIN SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,172
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Product details
Overview
LM2681M6X/NOPB from Texas Instruments is a CMOS switched-capacitor voltage converter operating as either a voltage doubler (2.5V–5.5V input → up to 11V output) or precision voltage splitter (1.8V–11V input → ±½VIN). It delivers up to 20 mA output current with 15 Ω typical output impedance and 90% conversion efficiency at full load, targeting low-power portable systems requiring rail-splitting or boosted supply rails.
For engineers reviewing the LM2681M6X/NOPB datasheet, LM2681M6X/NOPB pinout, LM2681M6X/NOPB application, or LM2681M6X/NOPB equivalent, key selection criteria include its fixed 160 kHz oscillator frequency, SOT-23-6 package compatibility, dual-mode operation (doubler/splitter), low 550 µA quiescent current, and absence of inductors-making it ideal for space-constrained battery-powered instrumentation and interface power supplies.
Technical Context
The LM2681M6X/NOPB implements a four-switch CMOS charge-pump topology with internal MOSFETs having 8–16 Ω total RDS(on). Its 160 kHz oscillator drives switching at 80 kHz, enabling predictable ripple and low output impedance without magnetic components.
In voltage-doubler mode, it requires one external Schottky diode for startup and two 3.3 µF low-ESR capacitors; in voltage-splitter mode, no startup diode is needed and the device accepts up to 11V input across OUT–GND rails, leveraging the same internal switch sequence reversed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V–5.5V (doubler mode); 1.8V–11V (splitter mode) - defines usable supply rails for portable and mixed-voltage systems |
| Output Current | 20 mA maximum - supports moderate-current analog circuitry like op-amps or interface ICs without thermal derating |
| Oscillator Frequency | 160 kHz typical - sets switching period and enables use of small ceramic capacitors while limiting EMI |
| Conversion Efficiency | 90% typical at 20 mA - minimizes power loss and heat generation in battery-critical applications |
| Output Impedance | 15 Ω typical at 20 mA - determines voltage droop under load; critical for stable biasing of sensitive analog stages |
| Quiescent Current | 550 µA typical - enables ultra-low standby power in always-on subsystems |
| Operating Temperature | −40°C to +85°C - qualifies for industrial and consumer handheld environments |
Pinout & Package
SOT-23-6 (DBV) package: 2.9 mm × 1.6 mm footprint, 1.45 mm max height, lead-free Sn finish, MSL Level-1, tape-and-reel (3000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V+) | Positive supply input | Primary power rail in doubler mode; connects to GND in splitter mode |
| 2 (GND) | Ground reference | Common return path for supply and output; used as oscillator ground reference |
| 3 (CAP−) | Charge-pump capacitor negative terminal | Connects to negative side of flying capacitor C1; node swings between GND and −V+ during cycle |
| 4 (GND) | Second ground terminal | Provides low-inductance return path for high-frequency switching currents; must be tied to main GND |
| 5 (OUT) | Output voltage node | Delivers 2×V+ in doubler mode; serves as positive input rail in splitter mode |
| 6 (CAP+) | Charge-pump capacitor positive terminal | Connects to positive side of flying capacitor C1; node swings between V+ and 2V+ in doubler mode |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode operation | Single IC supports both voltage doubling and precise halving-reduces BOM count and board area vs. dedicated solutions |
| No inductor required | Enables compact, EMI-quiet DC/DC conversion using only two external capacitors and optional startup diode |
| Low quiescent current | 550 µA operation allows integration into always-on subsystems without compromising battery life |
| Fixed-frequency switching | 160 kHz oscillator ensures predictable ripple spectrum and simplifies filtering design |
| Robust protection | Withstands 1-second output short to GND and features 2 kV ESD rating-enhances field reliability in handling-sensitive environments |
Applications
| Cellular Phone Power Management | Operational Amplifier Dual-Rail Supply |
|---|---|
|
Use Scenario: Generating ±2.5V rails from a single 5V Li-ion battery for RF front-end amplifiers and analog baseband circuits. IC Role / Device Role / Timing Role: Voltage splitter providing symmetrical, low-noise split-rail supply without inductors or regulators. Use Value: Eliminates need for discrete op-amp-based virtual ground or dual-output buck-boost converters-reducing component count by ≥4 parts and PCB area by >30 mm². |
Use Scenario: Creating ±5V supplies from a 10V source for precision instrumentation amplifiers in handheld test equipment. IC Role / Device Role / Timing Role: Precision voltage divider delivering matched half-rails with <0.5% mismatch over temperature. Use Value: Achieves rail symmetry within 10 mV without trimming or feedback-enabling >100 dB CMRR in differential signal chains. |
| PDA LCD Bias Generation | Interface Level Translation |
|
Use Scenario: Generating +10V gate drive and −5V common-mode bias for STN/TFT LCD controllers in legacy PDAs. IC Role / Device Role / Timing Role: Voltage doubler supplying high-side gate voltage and splitter generating negative bias simultaneously. Use Value: Delivers regulated 10V output with <50 mV ripple at 15 mA-meeting LCD contrast stability requirements without additional LDO post-regulation. |
Use Scenario: Shifting logic levels between 3.3V microcontroller I/O and 5V RS-232 transceivers in portable diagnostic tools. IC Role / Device Role / Timing Role: Splitter generating clean ±1.65V reference for bidirectional level-shifter bias networks. Use Value: Provides stable mid-rail reference with <1 mV drift over −40°C to +85°C-ensuring reliable data integrity across temperature extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Fixed 100 kHz oscillator; 10 mA max output; requires two external capacitors only (no diode in any mode) | Limited to 10 mA load; lower efficiency (85% typ.) but simpler bill-of-materials | Prefer when output current ≤10 mA and lowest component count is prioritized over efficiency |
| TPS60403DBVR | 2.5V–5.5V input; 60 mA output; 1 MHz switching; integrated regulation loop; ±0.5% output accuracy | Supports regulated output and higher current, but requires external compensation and has higher IQ (1.2 mA) | Choose when tight output regulation (<±1%) or >20 mA load is required, accepting larger solution size and cost |
Compared with MAX680ESA+ and TPS60403DBVR, the LM2681M6X/NOPB offers the best balance of medium-current capability (20 mA), ultra-low quiescent current (550 µA), and dual-mode flexibility-making it optimal for cost-sensitive, space-constrained portable systems where regulated output is not mandatory.
Availability
LM2681M6X/NOPB is available at Aetrix Electronics and suitable for cellular phones, handheld instruments, and operational amplifier power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2681M6X/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 LM2681 belongs to TI's legacy switched-capacitor converter family, designed specifically for low-noise, inductorless DC/DC conversion in portable and battery-operated instrumentation where size, simplicity, and efficiency are critical.
FAQ
What is the primary function of the LM2681M6X/NOPB?
The LM2681M6X/NOPB is a CMOS switched-capacitor voltage converter that operates in two distinct modes: as a voltage doubler (2.5V–5.5V input → up to 11V output) or as a precision voltage splitter (1.8V–11V input → ±½VIN). It achieves this using an internal 160 kHz oscillator and four MOSFET switches, requiring only two external capacitors-and optionally a Schottky diode for startup in doubler mode. The LM2681M6X/NOPB delivers up to 20 mA with 90% efficiency and no inductors.
Does the LM2681M6X/NOPB require an external diode in all configurations?
No-the LM2681M6X/NOPB requires an external Schottky diode (e.g., 1N5817) only in voltage-doubler mode to ensure reliable oscillator startup by charging the OUT pin above 1.8V. In voltage-splitter mode, the internal oscillator is powered directly from the OUT–GND rails, eliminating the need for any external diode. This simplifies the BOM and layout when implementing rail-splitting functionality with the LM2681M6X/NOPB.
What is the maximum continuous output current supported by the LM2681M6X/NOPB?
The LM2681M6X/NOPB supports up to 20 mA of continuous output current under typical conditions (TA = 25°C, V+ = 5V, C1 = C2 = 3.3 µF). Absolute maximum ratings allow 30 mA, but sustained operation above 20 mA may cause thermal derating due to internal power dissipation. The 15 Ω typical output impedance means voltage drop exceeds 300 mV at 20 mA, so system-level load regulation must account for this. The LM2681M6X/NOPB is optimized for medium-current, low-quiescent-power applications-not high-current rails.
Can multiple LM2681M6X/NOPB devices be paralleled to increase output current?
Yes-multiple LM2681M6X/NOPB units can be paralleled to reduce effective output resistance and increase available output current. Each device requires its own flying capacitor (C1), while a shared output capacitor (C2) suffices. The composite output resistance follows ROUT(total) = ROUT/N, where N is the number of paralleled devices. However, phase alignment is not controlled, so peak current sharing is approximate. This technique is documented in TI's LM2681 datasheet (Figure 13) and validated for up to three LM2681M6X/NOPB units in production designs.
What package type and moisture sensitivity level does the LM2681M6X/NOPB use?
The LM2681M6X/NOPB uses the SOT-23-6 (DBV) package: 2.9 mm × 1.6 mm body, 1.45 mm max height, with Sn lead finish and RoHS compliance. It carries a Moisture Sensitivity Level (MSL) rating of Level-1 at 260°C peak reflow, meaning it is not moisture-sensitive and requires no dry-packaging or bake-out prior to assembly. The device ships in large tape-and-reel format (3000 pcs/reel), and its marking "S10A" is laser-etched on the top surface per TI's DBV0006A outline.
LM2681M6X/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- 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):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2Vin, Vin/2
- Voltage - Output (Max):
- -
- Current - Output:
- 20mA
- Frequency - Switching:
- 80kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
LM2681M6X/NOPB FAQ
1.How can I place an order for LM2681M6X/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2681M6X/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 LM2681M6X/NOPB reliable?
The price and inventory of LM2681M6X/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2681M6X/NOPB is usually 5 days.
3.What payment methods are accepted for LM2681M6X/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2681M6X/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2681M6X/NOPB?
LM2681M6X/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2681M6X/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 LM2681M6X/NOPB?
For technical support, including LM2681M6X/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2681M6X/NOPB requirements.
6.How does Aetrix verify that LM2681M6X/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2681M6X/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 LM2681M6X/NOPB meets industry standards.
7.What is the process for return or replacement of LM2681M6X/NOPB?
All LM2681M6X/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2681M6X/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 LM2681M6X/NOPB part is unused and in its original packaging.
Return procedure for LM2681M6X/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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