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Texas Instruments LM2660MM/NOPB
- Part No.:
- LM2660MM/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM2660MM/NOPB.pdf
- Description:
- IC REG CHG PUMP INV 100MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,166
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Product details
Overview
LM2660MM/NOPB from Texas Instruments is a CMOS switched-capacitor voltage converter configured as an unregulated inverter or doubler, operating from 1.5 V to 5.5 V input, delivering up to 100 mA output current with 6.5 Ω typical output resistance and 88% conversion efficiency at full load - widely used in portable medical instruments and handheld instrumentation requiring compact, inductorless negative/positive rail generation.
For engineers reviewing the LM2660MM/NOPB datasheet, LM2660MM/NOPB pinout, LM2660MM/NOPB application, or LM2660MM/NOPB equivalent, key selection considerations include oscillator frequency selectability (10 kHz/80 kHz), LV pin configuration for low-voltage operation (<3.5 V), external capacitor programmability on OSC, and VSSOP-8 package compatibility with space-constrained PCB layouts.
Technical Context
The LM2660MM/NOPB implements a four-switch charge-pump topology with internal CMOS switches driven by a user-selectable oscillator (10 kHz or 80 kHz via FC pin), enabling precise voltage inversion (VOUT ≈ −VIN) or doubling (VOUT ≈ +2VIN). Its switching frequency is exactly half the oscillator frequency, and it supports external clock drive (≤150 kHz) only in inverter mode.
Functional modes are determined by pin strapping: LV tied to GND enables inverter operation down to 1.5 V; LV tied to OUT configures voltage doubling from ≥2.5 V input; OSC pin accepts external capacitance for frequency reduction or external CMOS clock (inverter mode only), while FC pin selects nominal 10 kHz (open) or 80 kHz (V+) oscillator frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5 V to 5.5 V - supports single-cell Li-ion, alkaline, or regulated 3.3 V/5 V rails without external regulation. |
| Output Current | 100 mA - sufficient for dual-rail op-amps, RS-232 transceivers, and LCD bias supplies. |
| Oscillator Frequency | 10 kHz (FC open) or 80 kHz (FC = V+) - higher frequency enables smaller external capacitors and lower output impedance. |
| Output Resistance | 6.5 Ω typical at 100 mA - defines voltage drop under load; reduced further by paralleling multiple LM2660MM/NOPB units. |
| Conversion Efficiency | 88% typical at 100 mA - minimizes quiescent power loss (120 µA IQ) in battery-powered systems. |
| Package | VSSOP-8 (3.0 mm × 3.0 mm) - surface-mount, thermally enhanced footprint for high-density portable designs. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and medical-grade embedded applications. |
Pinout & Package
VSSOP-8 package (DGK), 3.00 mm × 3.00 mm body size, exposed pad not present, RoHS-compliant matte tin lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FC | Oscillator frequency control input | Selects 10 kHz (open) or 80 kHz (tied to V+) internal oscillator; no effect when OSC driven externally. |
| 2 CAP+ | Positive flying capacitor terminal | Connects to positive plate of charge-pump capacitor C1; carries bidirectional switching current. |
| 3 GND | Power supply ground reference | Common return for input, output, and internal oscillator; must be low-inductance connection. |
| 4 CAP− | Negative flying capacitor terminal | Connects to negative plate of C1; forms charge-transfer path with CAP+ during switching phases. |
| 5 OUT | Inverter output / Doubler ground | In inverter mode: negative output rail; in doubler mode: grounded node - function depends on LV and V+/GND assignment. |
| 6 LV | Low-voltage enable input | Tie to GND for 1.5–3.5 V operation; tie to OUT for doubler mode; leave open for ≥3.5 V inverter use. |
| 7 OSC | Oscillator control input | Accepts external capacitor for frequency reduction or external CMOS clock (≤150 kHz) in inverter mode only. |
| 8 V+ | Positive supply input / Doubler output | In inverter mode: input rail; in doubler mode: positive output rail - role defined by external pin connections. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless voltage conversion | Eliminates EMI, size, and cost penalties of magnetic-based DC/DC converters - ideal for noise-sensitive analog circuits. |
| Configurable topology (inverter/doubler) | Single IC supports both negative rail generation (e.g., −5 V from +5 V) and positive doubling (e.g., +10 V from +5 V) via pin-strapping. |
| Parallel operation support | Multiple LM2660MM/NOPB units can share one output capacitor while using individual flying capacitors, reducing composite output resistance linearly. |
| Low quiescent current | 120 µA typical supply current enables >1-year battery life in always-on portable instrumentation with intermittent load. |
| External frequency control | OSC pin allows tuning ripple and output impedance via external capacitor or synchronization to system clock - critical for EMI compliance. |
Applications
| Laptop Peripheral Power | Medical Sensor Biasing |
|---|---|
|
Use Scenario: Generating isolated ±5 V rails for analog front-end circuitry in portable ECG monitors. IC Role / Device Role / Timing Role: LM2660MM/NOPB acts as a compact, low-noise negative voltage inverter supplying clean −5 V to precision op-amps and ADC references. Use Value: Eliminates need for bulky inductors and reduces board area by >40% versus inductive buck-boost solutions while maintaining <10 mVpp ripple at 100 mA. |
Use Scenario: Providing dual-rail supply to low-power instrumentation amplifiers in handheld blood glucose meters. IC Role / Device Role / Timing Role: LM2660MM/NOPB operates in inverter mode (LV = GND) from a single 3.0 V coin cell to deliver stable −3.0 V output. Use Value: Enables true rail-to-rail input signal conditioning with 120 µA quiescent current, extending battery life beyond 2 years in intermittent-use devices. |
| RS-232 Transceiver Supply | Industrial PLC Analog Output |
|
Use Scenario: Powering ±12 V interface rails for RS-232 line drivers in compact industrial gateways. IC Role / Device Role / Timing Role: LM2660MM/NOPB cascaded in two-stage inverter configuration generates −12 V from +5 V system rail. Use Value: Achieves −12 V at 20 mA with <5% regulation error and no external LDO required - meets TIA-232-F voltage compliance. |
Use Scenario: Creating isolated ±15 V supplies for 4–20 mA current loop DACs in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: LM2660MM/NOPB configured as voltage doubler (LV = OUT) generates +10 V from +5 V, followed by LDO for precision +15 V. Use Value: Reduces thermal load vs. linear regulators and avoids transformer-based isolation, simplifying CE-compliant design for Class I equipment. |
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 10 kHz oscillator; no FC/OSC programmability; 120 mA output; SO-8 only | Less flexible frequency control; no VSSOP option; higher IQ (250 µA) | Choose when fixed-frequency, higher-current inverter is acceptable and VSSOP footprint is not required. |
| TPS60403DBVR | Regulated inverter (±1%); 60 mA output; integrated LDO; 1.8–5.5 V input; SOT-23-6 | Delivers precise −3.3 V/−5 V without external regulation; lower output current; smaller package | Choose when tight output voltage tolerance is mandatory and 60 mA load is sufficient. |
Compared with MAX680ESA+ and TPS60403DBVR, the LM2660MM/NOPB offers unique trade-offs: programmable oscillator frequency and dual-mode (inverter/doubler) capability in a space-saving VSSOP-8, but requires external regulation for precision outputs and lacks built-in feedback control.
Availability
LM2660MM/NOPB is available at Aetrix Electronics and suitable for laptop peripheral power, medical sensor biasing, RS-232 transceiver supply, and industrial PLC analog output applications requiring stable component supply across long-lifecycle embedded programs.
Supply support for LM2660MM/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 connectivity technologies, with over 90 years of innovation in power management and signal chain solutions.
The LM2660 product line delivers unregulated switched-capacitor voltage conversion for space- and cost-constrained portable electronics, emphasizing low EMI, minimal external components, and flexible topology configuration.
FAQ
What is the maximum input voltage the LM2660MM/NOPB can handle?
The LM2660MM/NOPB has an absolute maximum supply voltage rating of 6 V (V+ to GND or GND to OUT). For reliable operation, the recommended input range is 1.5 V to 5.5 V - exceeding 5.5 V risks permanent damage even if within the 6 V absolute limit. The device's internal protection does not include overvoltage shutdown, so external clamping or regulation is advised if input transients exceed 5.5 V.
Can the LM2660MM/NOPB generate a regulated output voltage?
The LM2660MM/NOPB itself provides unregulated output - its inverter output is approximately −VIN, and its doubler output is approximately +2VIN. To achieve regulation, an external low-dropout linear regulator (e.g., LP2951 for negative output or LP2981 for positive output) must be added downstream. TI's Figure 20 and Figure 21 in the LM2660MM/NOPB datasheet show validated schematics for regulated −1.5 V to −5.5 V and +5 V outputs.
Is the LM2660MM/NOPB pin-compatible with the LMC7660?
The LM2660MM/NOPB is not pin-compatible with the LMC7660 - they differ in pin functions (e.g., LV pin on LM2660MM/NOPB has no counterpart on LMC7660) and electrical behavior. However, the LM2660MM/NOPB supports direct substitution in many LMC7660 designs when LV is left open and FC is open, due to identical SOIC-8 and VSSOP-8 footprints and overlapping input/output ranges - but layout review and functional validation are required before replacement.
How does the LV pin affect LM2660MM/NOPB operation?
The LV pin determines operational mode and voltage range: when tied to GND, the LM2660MM/NOPB operates as an inverter from 1.5 V to 5.5 V; when tied to OUT, it operates as a doubler from 2.5 V to 5.5 V; when left open, it operates as an inverter above 3.5 V. Leaving LV open simplifies migration from LMC7660 designs but disables sub-3.5 V operation - incorrect LV configuration causes startup failure or undefined output.
What external capacitors are recommended for the LM2660MM/NOPB?
TI recommends low-ESR ceramic or tantalum capacitors for both flying (C1) and output (C2) roles - specifically 150 µF tantalum (e.g., AVX TPS series) or 10–22 µF X7R ceramics with ≤100 mΩ ESR. Capacitor selection directly impacts output resistance and ripple: high-ESR types increase voltage drop and reduce efficiency, while insufficient capacitance raises ripple and degrades load regulation. C1 and C2 values should match unless optimizing for specific ripple/resistance trade-offs.
LM2660MM/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:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin, Vin/2
- Voltage - Output (Max):
- -
- Current - Output:
- 100mA
- Frequency - Switching:
- 5kHz, 40kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LM2660MM/NOPB FAQ
1.How can I place an order for LM2660MM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2660MM/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 LM2660MM/NOPB reliable?
The price and inventory of LM2660MM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2660MM/NOPB is usually 5 days.
3.What payment methods are accepted for LM2660MM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2660MM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2660MM/NOPB?
LM2660MM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2660MM/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 LM2660MM/NOPB?
For technical support, including LM2660MM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2660MM/NOPB requirements.
6.How does Aetrix verify that LM2660MM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2660MM/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 LM2660MM/NOPB meets industry standards.
7.What is the process for return or replacement of LM2660MM/NOPB?
All LM2660MM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2660MM/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 LM2660MM/NOPB part is unused and in its original packaging.
Return procedure for LM2660MM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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