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Texas Instruments LM2660MX/NOPB
- Part No.:
- LM2660MX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2660MX/NOPB.pdf
- Description:
- IC REG CHRG PUMP INV 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,787
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Product details
Overview
LM2660MX/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 in portable medical instruments and interface power supplies.
For engineers reviewing the LM2660MX/NOPB datasheet, LM2660MX/NOPB pinout, LM2660MX/NOPB application, or LM2660MX/NOPB equivalent, key selection considerations include oscillator frequency selectability (10 kHz/80 kHz), LV pin low-voltage enable logic, FC pin mode control, and SOIC-8 package compatibility with LMC7660 drop-in replacement designs.
Technical Context
The LM2660MX/NOPB implements a four-switch CMOS charge-pump topology that alternates between capacitor charging and transfer phases to invert or double input voltage without inductors. Its internal oscillator drives synchronous switching at half the oscillator frequency (5 kHz or 40 kHz switching rate), with FC pin selection determining nominal 10 kHz or 80 kHz operation.
Functional modes are defined by external pin configuration: inversion requires V+ as input and OUT as negative output with LV open or grounded depending on input voltage; doubling requires GND as input and V+ as positive output with LV tied to OUT. OSC pin supports external clock drive only in inverter mode, up to 150 kHz.
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 regulation. |
| Output Current | 100 mA - sufficient for op-amp dual-rail biasing and low-power analog circuitry requiring ±5 V or ±3.3 V. |
| Oscillator Frequency | 10 kHz or 80 kHz (FC pin selectable) - lower frequency reduces quiescent current (0.12 mA); higher frequency enables smaller external capacitors. |
| Output Resistance | 6.5 Ω typical at 100 mA - determines load regulation error (e.g., 650 mV drop at 100 mA); reduced further by paralleling devices. |
| Conversion Efficiency | 88% typical at 100 mA - balances power loss and EMI; exceeds 90% at lighter loads due to 120 µA quiescent current. |
| Package | SOIC-8 (4.90 mm × 3.91 mm) - industry-standard footprint compatible with automated assembly and legacy LMC7660 layouts. |
Pinout & Package
LM2660MX/NOPB is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, optimized for surface-mount assembly and thermal dissipation up to 735 mW in free-air conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FC | Oscillator frequency control input | Open = 10 kHz; connected to V+ = 80 kHz; no effect when OSC driven externally (inverter mode only). |
| 2 CAP+ | Positive flying capacitor terminal | Connects to + terminal of external charge-pump capacitor C1; carries bidirectional switching current. |
| 3 GND | Power supply ground reference | Primary return path for input supply, oscillator, and output stage; must be low-impedance for ripple control. |
| 4 CAP− | Negative flying capacitor terminal | Connects to − terminal of C1; forms charge-transfer path during pump phase; shares GND reference in doubler mode. |
| 5 OUT | Inverter output / Doubler ground | In inverter mode: negative voltage output (−V+); in doubler mode: tied to GND as input reference. |
| 6 LV | Low-voltage enable input | Tied to GND for V+ < 3.5 V to bypass internal regulator; open or GND for V+ ≥ 3.5 V; must be GND when OSC driven externally. |
| 7 OSC | Oscillator control input | Internal 15 pF node; accepts external capacitor to reduce frequency or external CMOS clock ≤150 kHz (inverter only). |
| 8 V+ | Positive supply input / Doubler output | In inverter mode: main input rail; in doubler mode: positive output (2×VIN) with GND applied to original V+ pin. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable topology | Single device supports both voltage inversion (−VIN) and doubling (+2VIN) via pin-strapping - eliminates need for separate part numbers. |
| Low-quiescent-current operation | 120 µA typical supply current enables >10-year battery life in always-on medical sensors and handheld diagnostics. |
| Parallelable architecture | Multiple LM2660MX/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 - allows EMI reduction via spread-spectrum or system-clock alignment. |
| Low-ESR capacitor optimization | Output resistance and ripple explicitly modeled against capacitor ESR - guides selection of ceramic/tantalum types per Table 2 in datasheet. |
Applications
| Operational Amplifier Power Supplies | Interface Power Supplies |
|---|---|
Use Scenario: Dual-rail op-amp circuits in portable data acquisition systems require symmetric ±5 V supplies from a single 5 V source. IC Role / Device Role / Timing Role: LM2660MX/NOPB acts as a negative rail generator, inverting +5 V to −5 V while maintaining tight regulation under dynamic load steps. Use Value: Eliminates need for bulky inductor-based DC/DC converters, reducing board area by >40% and enabling compact 2-layer PCB layouts. |
Use Scenario: RS-232 transceivers in handheld test equipment require ±12 V bias from a 3.3 V microcontroller rail. IC Role / Device Role / Timing Role: LM2660MX/NOPB operates in cascaded inverter configuration to generate −12 V, synchronized via shared OSC signal to suppress conducted EMI. Use Value: Achieves −12 V at 20 mA with <50 mV ripple using only three 10 µF ceramic capacitors - meets TIA-232 voltage compliance without linear post-regulation. |
| Medical Instrumentation | Laptop Peripheral Interfaces |
Use Scenario: Portable ECG front-ends demand ultra-low-noise analog supply rails isolated from digital switching noise. IC Role / Device Role / Timing Role: LM2660MX/NOPB provides dedicated −3.3 V rail for instrumentation amplifiers, with FC pin set to 10 kHz to minimize high-frequency coupling into sensitive analog paths. Use Value: 120 µA quiescent current extends disposable battery life to 18 months; SOIC-8 package allows placement near analog section with minimal trace length. |
Use Scenario: USB-C dock controllers require auxiliary ±5 V rails for level-shifting and hot-swap detection circuitry. IC Role / Device Role / Timing Role: LM2660MX/NOPB functions as a compact, low-cost inverter supplying −5 V to comparator inputs and gate drivers. Use Value: 6.5 Ω output resistance ensures stable 500 mV headroom across 0–50 mA load range - avoids false hot-swap triggers during plug-in events. |
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 |
|---|---|---|---|
| LMC7660IMX/NOPB | Same SOIC-8 footprint and pinout; 100 µA quiescent current; fixed 10 kHz oscillator; no FC/OSC pins. | Lacks frequency selectability and external clock support; limited to inverter mode only - no voltage-doubling capability. | Select when design prioritizes lowest BOM cost and simplicity over flexibility; verify LV pin handling matches legacy layout. |
| MAX680CPA+ | SOIC-8; 125 µA quiescent current; fixed 10 kHz; integrated flying capacitor switch; no LV/FC/OSC pins. | Higher 12 Ω output resistance limits max load to ~50 mA; no low-voltage enable or mode reconfiguration - strictly inverter-only. | Choose for space-constrained designs where integrated switch simplifies layout; confirm output impedance meets load regulation requirements. |
Compared with LMC7660IMX/NOPB and MAX680CPA+, the LM2660MX/NOPB offers unique dual-mode operation, programmable frequency, and parallel scalability - making it optimal for next-generation portable instruments requiring flexible rail generation with minimal footprint overhead.
Availability
LM2660MX/NOPB is available at Aetrix Electronics and suitable for laptop computers, cellular phones, medical instruments, operational amplifier power supplies, and interface power supplies requiring stable component supply across long-lifecycle industrial programs.
Supply support for LM2660MX/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 and embedded processing technologies, with leadership in power management, signal chain, and high-reliability components.
The LM2660MX/NOPB belongs to TI's switched-capacitor voltage converter product line, designed specifically for battery-powered portable electronics needing compact, inductorless rail generation with configurable polarity and voltage scaling.
FAQ
What is the maximum input voltage the LM2660MX/NOPB can accept in voltage inverter mode?
The LM2660MX/NOPB supports a maximum input voltage of 5.5 V in inverter mode when the LV pin is left open or tied to GND. Absolute maximum rating for V+ to GND is 6 V, but continuous operation above 5.5 V risks reliability degradation per Section 6.1 of the datasheet. For inputs exceeding 5.5 V, external regulation is required before applying to the V+ pin of the LM2660MX/NOPB.
Can the LM2660MX/NOPB be used to generate a regulated negative output voltage?
Yes, the LM2660MX/NOPB can generate a regulated negative output when paired with an external low-dropout linear regulator such as the LP2951. As shown in Figure 20 of the datasheet, the LM2660MX/NOPB provides the unregulated −V+ rail, and the LP2951 regulates it to a precise −1.5 V to −5.5 V range using feedback resistors. This configuration maintains the LM2660MX/NOPB's efficiency advantages while adding tight output tolerance.
Does the LM2660MX/NOPB support external clock synchronization, and what are the constraints?
The LM2660MX/NOPB supports external clock synchronization only in voltage inverter mode via the OSC pin, accepting CMOS-level signals up to 150 kHz. The LV pin must be tied to GND during external clock operation. In voltage-doubling mode, OSC cannot be driven externally - this restriction is explicitly stated in Section 8.3.1. Clock edges must swing within 100 mV of V+ and GND to ensure reliable switching.
How does the LV pin affect performance of the LM2660MX/NOPB below 3.5 V input?
When input voltage is below 3.5 V, the LV pin must be tied to GND to bypass internal regulator circuitry and maintain proper oscillator operation and charge-pump efficiency. Leaving LV open under low-voltage conditions causes degraded output regulation and increased ripple. Above 3.5 V, LV may be open or grounded - leaving it open simplifies drop-in replacement for LMC7660 designs, as noted in Section 9.2.1.1.
What is the recommended capacitor type and value for stable operation of the LM2660MX/NOPB at 100 mA load?
Texas Instruments recommends 150 µF low-ESR tantalum or ceramic capacitors for both C1 (flying) and C2 (output), with ESR ≤ 0.2 Ω per Section 6.5. Ceramic capacitors are preferred for lowest ESR and smallest footprint; Nichicon PL/PF, AVX TPS, and Sanyo OS-CON series are validated options per Table 2. Using mismatched or high-ESR capacitors increases output resistance beyond 6.5 Ω and reduces efficiency below 88% at full load.
LM2660MX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
LM2660MX/NOPB FAQ
1.How can I place an order for LM2660MX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2660MX/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 LM2660MX/NOPB reliable?
The price and inventory of LM2660MX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2660MX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2660MX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2660MX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2660MX/NOPB?
LM2660MX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2660MX/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 LM2660MX/NOPB?
For technical support, including LM2660MX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2660MX/NOPB requirements.
6.How does Aetrix verify that LM2660MX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2660MX/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 LM2660MX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2660MX/NOPB?
All LM2660MX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2660MX/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 LM2660MX/NOPB part is unused and in its original packaging.
Return procedure for LM2660MX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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