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Texas Instruments LM2687MMX/NOPB
- Part No.:
- LM2687MMX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM2687MMX/NOPB.pdf
- Description:
- IC REG CHRG PUMP ADJ 10MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,870
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Product details
Overview
LM2687MMX/NOPB from Texas Instruments is a low-noise, regulated switched-capacitor voltage inverter IC that converts +2.7V to +5.5V input into an adjustable negative output from −1.5V to −5.2V, delivers up to 10mA output current with 1mV typical ripple and 91% typical charge-pump efficiency, and operates at 100kHz switching frequency - ideal for GaAsFET power amplifier biasing in cellular handsets.
For engineers reviewing the LM2687MMX/NOPB datasheet, LM2687MMX/NOPB pinout, LM2687MMX/NOPB application, or LM2687MMX/NOPB equivalent, key selection considerations include its regulated negative output range, ultra-low shutdown current (0.05µA), MSOP-8 package compatibility, and feedback-based output adjustment via external resistors without requiring inductors.
Technical Context
The LM2687MMX/NOPB integrates a fixed-frequency (100kHz typ.) switched-capacitor inverter stage followed by a low-dropout linear regulator, enabling precise regulation of the inverted output while suppressing charge-pump ripple via high PSRR. Its architecture eliminates inductors and relies on four external ceramic capacitors (C1–C3 + bypass).
Feedback is implemented through the VFB pin referenced to −1.20V (typ.), allowing output voltage setting via resistor divider between VOUT, VFB, and VADJ (0V to VIN). Shutdown is active-low logic compatible (VIH = 2.2V, VIL = 0.5V) and forces VOUT/VNEG to ground while reducing quiescent current to 0.05µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +2.7V to +5.5V - supports single-cell Li-ion, 3.3V, and 5V rails without external regulators. |
| Output Voltage Range | −1.5V to −5.2V - adjustable via external resistor divider; enables flexible biasing of RF power amplifiers. |
| Max Output Current | 10mA - sufficient for GaAsFET gate bias and low-power analog circuitry. |
| Output Ripple | 1mV (typ.) - achieved via PSRR filtering of charge-pump noise by integrated LDO stage. |
| Shutdown Current | 0.05µA (typ.) - enables battery-sensitive portable applications with near-zero standby drain. |
| Switching Frequency | 100kHz (typ.) - balances capacitor size, ESR sensitivity, and EMI profile for handheld use. |
| Power Efficiency | 91% (typ. at 10mA) - minimizes thermal load and extends battery life in compact enclosures. |
Pinout & Package
LM2687MMX/NOPB is housed in an 8-pin MSOP (MUA08A) package with exposed die attach pad not present - distinct from LLP variant. Pin functions are validated per National Semiconductor DS101180 and TI SNVS060D.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Cap+ | Charge pump flying capacitor positive terminal | Connects to C1+; internal switch node for voltage inversion phase 1. |
| 2 - GND | Ground reference | Primary return path for all internal circuits and external capacitors. |
| 3 - Cap− | Charge pump flying capacitor negative terminal | Connects to C1−; internal switch node for voltage inversion phase 2. |
| 4 - SD | Active-low shutdown control | Pull low to disable inverter/LDO; pulls VOUT/VNEG to GND during shutdown. |
| 5 - VNEG | Unregulated negative output | Raw inverted voltage pre-LDO; used only if regulation not required or for auxiliary bias. |
| 6 - VFB | Feedback input | Monitors output via resistor divider; internal −1.20V reference sets regulated VOUT. |
| 7 - VOUT | Regulated negative output | Final stable output; filtered by internal LDO to suppress ripple and supply noise. |
| 8 - VIN | Positive input supply | Accepts 2.7–5.5V; powers both charge pump and LDO stages. |
Key Features
| Feature | Design Value |
|---|---|
| Regulated negative output | Enables precision biasing of GaAsFET amplifiers without external op-amps or discrete regulators. |
| Inductorless operation | Reduces BOM count, PCB area, and EMI risk by using only four low-ESR ceramic capacitors. |
| 1mV typical output ripple | Meets stringent RF bias noise requirements where >100dB PSRR is needed at baseband frequencies. |
| 0.05µA shutdown current | Extends shelf life and runtime in always-on portable devices such as cellular modems and IoT sensors. |
| MSOP-8 footprint | Provides 3mm × 3mm board space savings vs. SOIC-8 while maintaining hand-solderability and reflow compatibility. |
Applications
| Cellular Phone Power Amplifier Biasing | Interface Power Supplies |
|---|---|
Use Scenario: Providing stable negative gate bias to GaAsFET power amplifiers in 3G/4G handset front-end modules. IC Role / Device Role / Timing Role: Regulated negative voltage source with ultra-low noise and fast transient response to support PA gain control. Use Value: Eliminates need for discrete LDO + inverter combos; achieves <1mV ripple critical for EVM compliance in WCDMA/LTE transmission. |
Use Scenario: Generating −3.3V or −5V for RS-232 transceivers, LCD bias, or op-amp dual supplies in portable instrumentation. IC Role / Device Role / Timing Role: Compact, low-noise negative rail generator replacing transformer-based or inductor-based solutions. Use Value: Reduces solution size by >60% vs. discrete charge-pump + regulator designs while maintaining ±1% output accuracy over load/temperature. |
| Handheld Instrumentation | Laptop Computers and PDAs |
Use Scenario: Supplying clean negative reference voltage for 16-bit SAR ADC drivers and precision sensor signal conditioning. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current negative supply for analog front-ends in battery-powered test equipment. Use Value: Enables >90dB SNR in 100ksps data acquisition systems by minimizing supply-induced quantization noise. |
Use Scenario: Delivering −2.5V bias for smart battery fuel gauges and embedded controller I/O level shifting in ultraportable platforms. IC Role / Device Role / Timing Role: Efficient, space-constrained negative rail generator supporting dynamic voltage scaling and sleep-state retention. Use Value: Supports sub-10µA system deep-sleep modes via 0.05µA shutdown current without compromising wake-up latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar regulated negative voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Unregulated inverter; no feedback, fixed −2×VIN output; higher ripple (10mV); no shutdown. | Suitable only where output voltage tolerance >±5% and noise <10mV is acceptable. | Select when cost sensitivity outweighs regulation precision and noise performance. |
| TPS60403DBVR | Regulated inverter with 1.5% output accuracy; 2.5V–5.5V input; 60mA output; 1.2MHz switching. | Higher current capability but larger ripple (3mV) and no MSOP-8 option (only SOT-23-6). | Prefer when >10mA load or smaller solution size (SOT-23) is prioritized over ultra-low noise. |
Compared with MAX680ESA+ and TPS60403DBVR, the LM2687MMX/NOPB uniquely combines MSOP-8 packaging, 1mV ripple, and 0.05µA shutdown - making it optimal for space-constrained, battery-critical RF bias applications where regulation stability and noise floor dominate selection criteria.
Availability
LM2687MMX/NOPB is available at Aetrix Electronics and suitable for cellular phone power amplifier biasing, handheld instrumentation, and interface power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2687MMX/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 company specializing in analog, embedded processing, and connectivity technologies, with leadership in power management and precision analog ICs.
The LM2687MMX/NOPB belongs to TI's regulated charge-pump inverter product line, designed specifically for low-noise, inductorless negative voltage generation in portable RF and precision analog systems.
FAQ
What is the minimum and maximum input voltage for the LM2687MMX/NOPB?
The LM2687MMX/NOPB operates across an input voltage range of +2.7V to +5.5V. This allows direct compatibility with common battery chemistries including single-cell Li-ion (fully charged at 4.2V), 3.3V logic rails, and 5V USB-powered systems. Operation below 2.7V may cause regulation loss or startup failure, while exceeding 5.5V risks damage per absolute maximum ratings.
How is the output voltage adjusted on the LM2687MMX/NOPB?
The LM2687MMX/NOPB uses a resistor divider between VOUT, VFB, and VADJ (typically GND) to set output voltage. With VFB internally regulated to −1.20V (typ.), the equation VOUT = −1.20V × (1 + R1/R2) applies. For example, R1 = 200kΩ and R2 = 200kΩ yields VOUT = −2.4V. Resistor tolerances ≤1% are recommended for accuracy.
What capacitor values and types are required for stable operation of the LM2687MMX/NOPB?
The LM2687MMX/NOPB requires three external capacitors: C1 (flying, 1µF), C2 (charge-pump output, 1µF), and C3 (LDO output, 10µF), all with ≤0.3Ω ESR. Ceramic, chip tantalum, or polymer electrolytic types are approved. Using smaller values or higher-ESR capacitors increases output resistance, ripple, and dropout voltage - degrading regulation and noise performance.
Does the LM2687MMX/NOPB require an external compensation network?
No, the LM2687MMX/NOPB does not require external compensation. Its internal N-channel FET-based LDO regulator is fully compensated and stable with the minimum recommended output capacitor (10µF, ≤0.3Ω ESR). Stability is maintained across all load conditions and capacitor ESR values within specification - eliminating design iteration overhead.
What happens to VOUT and VNEG during shutdown of the LM2687MMX/NOPB?
When the SD pin is pulled low, the LM2687MMX/NOPB disables both the charge-pump and LDO stages, reducing supply current to 0.05µA (typ.). During shutdown, VOUT and VNEG are actively discharged to GND via internal switches - ensuring safe, predictable state transitions and preventing floating outputs in battery-powered systems.
LM2687MMX/NOPB 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:
- Step-Down
- Output Configuration:
- Negative
- Topology:
- Charge Pump
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -1.5V
- Voltage - Output (Max):
- -5.2V
- Current - Output:
- 10mA
- Frequency - Switching:
- 110kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LM2687MMX/NOPB FAQ
1.How can I place an order for LM2687MMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2687MMX/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 LM2687MMX/NOPB reliable?
The price and inventory of LM2687MMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2687MMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2687MMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2687MMX/NOPB transactions.
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4.How is shipping managed for LM2687MMX/NOPB?
LM2687MMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2687MMX/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 LM2687MMX/NOPB?
For technical support, including LM2687MMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2687MMX/NOPB requirements.
6.How does Aetrix verify that LM2687MMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2687MMX/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 LM2687MMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2687MMX/NOPB?
All LM2687MMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2687MMX/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 LM2687MMX/NOPB part is unused and in its original packaging.
Return procedure for LM2687MMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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