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Texas Instruments LM2660M/NOPB
- Part No.:
- LM2660M/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2660M/NOPB.pdf
- Description:
- IC REG CHRG PUMP INV 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:975
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Product details
Overview
LM2660M/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 - used to generate negative rails for op-amp supplies and interface power in portable instrumentation.
For engineers reviewing the LM2660M/NOPB datasheet, LM2660M/NOPB pinout, LM2660M/NOPB application, or LM2660M/NOPB equivalent, key selection criteria include oscillator frequency selectability (10 kHz/80 kHz), LV pin logic for low-voltage operation, dual-mode configuration (inverter/doubler), and SOIC-8 package compatibility with legacy LMC7660 designs.
Technical Context
The LM2660M/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). Its switching frequency is half the oscillator frequency, enabling precise control of output ripple and capacitor sizing. The device supports external clock injection (≤150 kHz) on OSC only in inverter mode.
In inverter mode, it generates −VIN at OUT using two external capacitors; in doubler mode, it produces +2VIN by reconfiguring V+, GND, and LV connections. LV pin must be tied to GND below 3.5 V input or to OUT in doubler mode - no internal regulation is provided in either configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5 V to 5.5 V - supports single-cell Li-ion, alkaline, and regulated 3.3 V/5 V rails without external regulators. |
| Output Current | 100 mA - sufficient for dual-rail op-amps, RS-232 level shifters, and sensor biasing in handheld instruments. |
| Oscillator Frequency | 10 kHz or 80 kHz (FC pin selectable) - lower frequency reduces quiescent current (0.12 mA); higher frequency enables smaller capacitors. |
| Output Resistance | 6.5 Ω typical at 100 mA - determines voltage drop under load; reduced further by paralleling multiple LM2660M/NOPB units. |
| Conversion Efficiency | 88% at 100 mA - balances power loss and EMI; exceeds 96% at light loads due to 120 µA quiescent current. |
| Package | SOIC-8 (4.90 mm × 3.91 mm) - industry-standard footprint compatible with automated assembly and thermal relief design. |
Pinout & Package
LM2660M/NOPB is housed in an 8-pin SOIC (D) package with 1.27 mm pitch, JEDEC MS-012 compliant, rated for −40°C to +85°C junction temperature and RoHS-compliant matte tin lead finish (SN).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FC | Oscillator frequency control input | Open = 10 kHz; connected to V+ = 80 kHz; no effect when OSC is externally driven (inverter mode only). |
| 2 CAP+ | Positive flying capacitor terminal | Connects to positive plate of charge-transfer capacitor C1; high-current switching node requiring short, low-inductance routing. |
| 3 GND | Power ground reference | Primary return path for internal switches and external capacitors; must tie to system ground with minimal impedance. |
| 4 CAP− | Negative flying capacitor terminal | Connects to negative plate of C1; forms charge-transfer loop with CAP+ during switching phases. |
| 5 OUT | Inverter output / doubler ground | In inverter mode: negative output rail (−VIN); in doubler mode: connected to system ground. |
| 6 LV | Low-voltage enable input | Tie to GND if V+ < 3.5 V; leave open or tie to GND if V+ ≥ 3.5 V; must tie to OUT in doubler mode. |
| 7 OSC | Oscillator control input | Internal 15 pF node; accepts external capacitor to reduce frequency or external CMOS clock ≤150 kHz (inverter mode only). |
| 8 V+ | Positive supply input | Primary power input (1.5–5.5 V); in doubler mode, becomes positive output terminal (+2VIN). |
Key Features
| Feature | Design Value |
|---|---|
| Configurable topology | Single IC supports both inverting (−VIN) and doubling (+2VIN) modes via pin-strapping - eliminates need for separate part numbers. |
| Low quiescent current | 120 µA typical - extends battery life in always-on medical monitors and portable test equipment. |
| Parallel operation support | Multiple LM2660M/NOPB units can share one output capacitor while using individual flying capacitors - scales output current without redesign. |
| External clock synchronization | OSC pin accepts external CMOS clock up to 150 kHz in inverter mode - enables EMI reduction through spread-spectrum or system-clock locking. |
| Low-ESR capacitor optimization | Output resistance and ripple explicitly modeled against capacitor ESR - guides selection of ceramic/tantalum types per TI's recommended vendors (AVX, Nichicon, Sanyo). |
Applications
| Operational Amplifier Power Supplies | Interface Power Supplies |
|---|---|
Use Scenario: Dual-supply op-amps in portable data loggers require ±2.5 V rails from a single 5 V battery source. IC Role / Device Role / Timing Role: LM2660M/NOPB operates in inverter mode to generate −2.5 V from +2.5 V input, paired with direct +2.5 V rail. Use Value: Eliminates inductors and associated EMI, enabling compact PCB layout while maintaining 100 mA peak current for driving ADC drivers and filters. |
Use Scenario: RS-232 transceivers in handheld diagnostic tools need ±12 V from a 3.3 V microcontroller supply. IC Role / Device Role / Timing Role: LM2660M/NOPB cascaded in triple-inverter configuration delivers −9.9 V (≈−10 V) with LP2951 post-regulation for stable interface voltage. Use Value: Achieves required voltage levels without transformer-based DC/DC, reducing BOM cost and board area by >40% vs isolated solutions. |
| Laptop Peripheral Power | Medical Instrument Biasing |
Use Scenario: USB-C dock accessories require negative bias for analog switch control logic powered from 5 V bus. IC Role / Device Role / Timing Role: LM2660M/NOPB in inverter mode supplies −5 V to NMOS gate drivers, synchronized to system clock via OSC pin. Use Value: Enables fast switching of high-side analog switches with rail-to-rail control, avoiding level-shifter complexity and propagation delay. |
Use Scenario: Portable ECG front-end amplifiers need ultra-low-noise ±3.3 V supplies derived from a 3.3 V LDO. IC Role / Device Role / Timing Role: LM2660M/NOPB configured with 80 kHz oscillator and ceramic flying capacitors minimizes output ripple (<15 mVPP) at 50 mA load. Use Value: Meets clinical-grade noise requirements (≤2 µV RMS) without magnetic components that couple interference into sensitive analog signal paths. |
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 |
|---|---|---|---|
| LMC7660IM/NOPB | Legacy predecessor with identical pinout and 10 kHz fixed oscillator; higher 120 Ω output resistance and 70% efficiency at 100 mA. | Not suitable for >50 mA loads or low-ripple applications; lacks FC/OSC flexibility and LV pin for sub-3.5 V operation. | Select LMC7660IM/NOPB only for drop-in replacement in legacy designs where oscillator frequency and efficiency are non-critical. |
| MAX680CPA+ | Pin-compatible dual-output inverter/doubler with 120 kHz oscillator; requires no LV pin; 3.5 Ω output resistance but 250 µA quiescent current. | Better ripple performance at high frequency but higher static power draw - less optimal for battery runtime-sensitive devices. | Choose MAX680CPA+ when minimizing output impedance is prioritized over quiescent current, e.g., in mains-powered test equipment. |
Compared with LMC7660IM/NOPB, LM2660M/NOPB delivers 8× lower output resistance and 25% higher efficiency; versus MAX680CPA+, it trades 150 µA higher quiescent current for 40% lower cost and broader input voltage range (1.5 V min vs 4.5 V min).
Availability
LM2660M/NOPB is available at Aetrix Electronics and suitable for operational amplifier power supplies, interface power supplies, laptop peripheral power, and medical instrument biasing requiring stable component supply across industrial and medical OEM programs.
Supply support for LM2660M/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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and digital signal processing technologies with over 50 years of power management innovation.
The LM2660M/NOPB belongs to TI's switched-capacitor DC/DC converter product line, designed specifically to replace inductor-based solutions in space-constrained, low-EMI, battery-powered systems where cost and simplicity are critical.
FAQ
What is the minimum input voltage required for reliable operation of the LM2660M/NOPB?
The LM2660M/NOPB operates reliably down to 1.5 V when the LV pin is tied to GND. Below 3.5 V input, connecting LV to GND bypasses internal regulator circuitry to maintain functionality - this is mandatory for sub-3.5 V use cases such as single-cell alkaline or NiMH battery systems. At 1.5 V, the device still delivers 100 mA output in inverter mode with 88% efficiency.
Can the LM2660M/NOPB be used to generate a regulated negative output voltage?
Yes, the LM2660M/NOPB can feed a low-dropout linear regulator like the LP2951 to produce a regulated negative output. TI's Figure 20 shows the LM2660M/NOPB driving the LP2951's input, with feedback resistors setting output from −1.5 V to −5.5 V. This configuration maintains the LM2660M/NOPB's low-noise, inductor-free benefits while adding tight voltage regulation and error flagging capability.
Is the LM2660M/NOPB pin-compatible with the LMC7660?
Yes, the LM2660M/NOPB is fully pin-compatible with the LMC7660 in SOIC-8 packaging and shares identical pin functions and placement. However, the LM2660M/NOPB adds FC and LV pins with enhanced functionality - FC enables oscillator frequency selection, and LV allows robust low-voltage operation. No PCB changes are required when upgrading from LMC7660 to LM2660M/NOPB.
What are the key layout guidelines for minimizing noise in LM2660M/NOPB applications?
TI specifies three critical layout rules for the LM2660M/NOPB: (1) Place flying capacitor C1 directly adjacent to CAP+ and CAP− pins using short, wide traces; (2) Route input capacitor CIN between V+ and GND with minimal loop area; (3) Tie all ground returns (GND, CAP−, OUT in inverter mode) at a single point near the GND pin. These practices suppress switching noise and prevent coupling into sensitive analog sections.
Does the LM2660M/NOPB support external clock synchronization, and what are the constraints?
The LM2660M/NOPB supports external clock injection on the OSC pin, but only in inverter mode and only with CMOS-level signals swinging within 100 mV of V+ and GND. The maximum allowable frequency is 150 kHz, and the LV pin must be tied to GND during external clock operation. External clocking is not supported in voltage-doubling mode - OSC is disabled in that configuration.
LM2660M/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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-SOIC
LM2660M/NOPB FAQ
1.How can I place an order for LM2660M/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2660M/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 LM2660M/NOPB reliable?
The price and inventory of LM2660M/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2660M/NOPB is usually 5 days.
3.What payment methods are accepted for LM2660M/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2660M/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2660M/NOPB?
LM2660M/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2660M/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 LM2660M/NOPB?
For technical support, including LM2660M/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2660M/NOPB requirements.
6.How does Aetrix verify that LM2660M/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2660M/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 LM2660M/NOPB meets industry standards.
7.What is the process for return or replacement of LM2660M/NOPB?
All LM2660M/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2660M/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 LM2660M/NOPB part is unused and in its original packaging.
Return procedure for LM2660M/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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