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Texas Instruments LM2660M-TI
- Part No.:
- LM2660M-TI
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2660M-TI.pdf
- Description:
- IC REG CHRG PUMP INV 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,032
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Product details
Overview
LM2660M-TI from Texas Instruments is a CMOS switched-capacitor voltage inverter that converts 1.5V–5.5V positive input to corresponding negative output, delivering up to 100 mA with 6.5 Ω typical output resistance and >90% efficiency at most loads-ideal for op-amp dual-rail supplies in portable medical instruments and handheld test equipment.
For engineers reviewing the LM2660M-TI datasheet, LM2660M-TI pinout, LM2660M-TI application, or LM2660M-TI equivalent, key selection criteria include selectable 10 kHz/80 kHz oscillator frequency via FC pin, SO-8 package compatibility, low 120 µA quiescent current, and support for both inverting and voltage-doubling topologies without inductors.
Technical Context
The LM2660M-TI implements a four-switch charge-pump topology using external capacitors for energy transfer, with internal CMOS switches sequenced to invert V+ across C1 and C2. Its oscillator frequency is user-selectable (10 kHz or 80 kHz) via the FC pin, directly determining switching frequency (fSW = fOSC/2) and trade-offs between output resistance and quiescent current.
It supports low-voltage operation down to 1.5V via LV pin control, requires no external clock for basic operation, and allows external capacitor-based oscillator tuning on the OSC pin-enabling ripple and efficiency optimization without layout changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5V to 5.5V - supports single-cell Li-ion, alkaline, and regulated 3.3V/5V rails without external regulation. |
| Output Current | 100 mA continuous - sufficient to power dual-supply op-amps (e.g., TL072, OPA234) and analog front-ends. |
| Oscillator Frequency | Selectable 10 kHz or 80 kHz - lower frequency reduces IQ (0.12 mA), higher frequency lowers output resistance and ripple. |
| Output Resistance | 6.5 Ω typical at 100 mA - defines load regulation error (e.g., 650 mV drop at full load); includes switch RON and capacitor ESR. |
| Conversion Efficiency | 88% typical at 100 mA - enables battery runtime extension in portable systems versus inductor-based alternatives. |
| Quiescent Current | 120 µA typical - critical for always-on subsystems such as sensor biasing or standby reference generation. |
| Package | SO-8 (M08A) - industry-standard 150-mil wide-body surface-mount package compatible with automated assembly. |
Pinout & Package
LM2660M-TI is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package per NS package code M08A, with 1.27 mm pitch, 5.0 mm × 4.0 mm body size, and standard gull-wing lead form.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FC) | Frequency Control Input | Selects internal oscillator frequency: open = 10 kHz, tied to V+ = 80 kHz; no effect when OSC driven externally. |
| 2 (CAP+) | Charge-Pump Capacitor Positive Terminal | Connects to positive terminal of flying capacitor C1; carries bidirectional switching current ≈2× IOUT. |
| 3 (GND) | Power Ground Reference | Primary ground return for internal logic, oscillator, and switch drivers; must be low-impedance for stable operation. |
| 4 (CAP−) | Charge-Pump Capacitor Negative Terminal | Connects to negative terminal of flying capacitor C1; forms charge-transfer path with CAP+ and internal switches. |
| 5 (OUT) | Negative Output Terminal | Delivers inverted voltage (≈ −VIN) to load; output impedance dominates load regulation and ripple performance. |
| 6 (LV) | Low-Voltage Mode Enable | Tie to GND for VIN < 3.5V to bypass internal regulator; optional for VIN ≥ 3.5V to simplify LMC7660 drop-in replacement. |
| 7 (OSC) | Oscillator Control/External Clock Input | Accepts external capacitor to reduce frequency or CMOS-level clock (≤150 kHz) in inverter mode only; LV must be grounded. |
| 8 (V+) | Positive Supply Input | Primary power input (1.5V–5.5V); also serves as output in voltage-doubling configuration when GND and OUT are grounded. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting & doubling capability | Single device supports both negative rail generation (VOUT ≈ −VIN) and positive doubling (VOUT ≈ +2VIN) via reconfigured external connections. |
| Selectably optimized efficiency/resistance | FC pin enables real-time trade-off: 10 kHz → lower IQ (0.12 mA); 80 kHz → lower ROUT (6.5 Ω) and ripple for same capacitor values. |
| Low-noise, inductorless design | Eliminates magnetic EMI, PCB area, and cost of inductors; uses only two ceramic/tantalum capacitors (C1, C2) with ESR ≤ 0.2 Ω. |
| Wide-input, low-voltage operation | Functions down to 1.5V with LV pin grounded-enables direct use with single alkaline or NiMH cells without pre-regulation. |
| Thermal robustness | Rated for −40°C to +85°C junction temperature; 170°C/W θJA in SO-8 allows 100 mA operation at ambient ≤ 65°C with minimal heatsinking. |
Applications
| Operational Amplifier Dual-Rail Supplies | Portable Medical Instrumentation |
|---|---|
|
Use Scenario: Generating symmetric ±5V or ±3.3V rails for precision instrumentation amplifiers and analog signal conditioning in handheld ECG or glucose meters. IC Role / Device Role / Timing Role: Voltage inverter providing clean, low-noise negative supply referenced to system ground-replacing bulky inductor-based converters. Use Value: Enables rail-to-rail op-amp operation with <650 mV load-induced drop at 100 mA, preserving ADC dynamic range and measurement accuracy. |
Use Scenario: Powering isolated analog front-ends and sensor bias circuits in battery-operated ultrasound probes and pulse oximeters. IC Role / Device Role / Timing Role: Low-quiescent-current (120 µA) inverter supplying negative bias for photodiode transimpedance amplifiers and DAC reference buffers. Use Value: Extends single-cell alkaline battery life beyond 100 hours while maintaining <10 mVpp output ripple via 10 µF/0.1 Ω ceramic capacitors. |
| Laptop Peripheral Interface Power | Handheld Test & Measurement Equipment |
|
Use Scenario: Providing −5V for legacy RS-232 level-shifting ICs (e.g., MAX3232) in ultraportable docking stations and USB-C adapters. IC Role / Device Role / Timing Role: Compact, SO-8-mounted inverter replacing discrete charge-pump solutions-supporting hot-plug detection and fast start-up. Use Value: Delivers regulated −4.8V at 50 mA with <50 mV line regulation error over 3.3V–5.5V input range, ensuring RS-232 compliance. |
Use Scenario: Generating negative supply for LCD bias, analog multiplexers, and calibration references in handheld multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Dual-mode converter (inverter/doubler) enabling flexible rail generation from shared 3.7V Li-ion battery without additional regulators. Use Value: Reduces BOM count by 2 components versus discrete solutions while achieving <1% output voltage drift over temperature (−40°C to +85°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMC7660IMX/NOPB | Fixed 10 kHz oscillator; no FC pin; 120 µA IQ; identical SO-8 footprint and pinout. | Lacks frequency selectability-cannot optimize for low ripple or ultra-low IQ simultaneously. | Preferred for cost-sensitive designs where fixed 10 kHz operation suffices and LMC7660 legacy compatibility is required. |
| MAX680ESA+ | Fixed 100 kHz oscillator; 100 µA IQ; 5.5V max input; SO-8 package; integrated oscillator. | Higher base frequency yields lower ROUT (≈4.5 Ω) but increases EMI sensitivity and limits low-IQ operation. | Chosen when lowest possible output resistance is prioritized and 100 kHz EMI can be managed via layout and filtering. |
Compared with LM2660M-TI, LMC7660IMX/NOPB offers pin-compatible drop-in replacement with identical functionality except FC pin omission, while MAX680ESA+ trades programmability for higher fixed frequency and marginally better ROUT, requiring careful EMI mitigation in noise-sensitive analog systems.
Availability
LM2660M-TI is available at Aetrix Electronics and suitable for portable medical instrumentation, handheld test equipment, and laptop peripheral interface power requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for LM2660M-TI 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, power efficiency, and system integration.
The LM2660M-TI belongs to TI's legacy switched-capacitor DC/DC converter product line, designed specifically for inductorless voltage inversion and doubling in space-constrained, battery-powered analog systems.
FAQ
What is the primary function of the LM2660M-TI?
The LM2660M-TI is a CMOS switched-capacitor voltage inverter that converts a positive input voltage (1.5V–5.5V) into a corresponding negative output voltage without inductors. It delivers up to 100 mA with selectable 10 kHz or 80 kHz oscillator frequency, making it ideal for generating dual-rail supplies in portable analog systems. The LM2660M-TI also supports voltage-doubling mode when externally reconfigured.
How does the FC pin affect LM2660M-TI operation?
The FC (Frequency Control) pin on the LM2660M-TI selects the internal oscillator frequency: open circuit sets 10 kHz (lower quiescent current: 0.12 mA), while tying FC to V+ selects 80 kHz (lower output resistance: 6.5 Ω typical). This pin has no effect when the OSC pin is driven by an external clock. The LM2660M-TI datasheet confirms this behavior applies exclusively to the LM2660 variant-not the LM2661.
Can LM2660M-TI operate from a 1.5V battery?
Yes, the LM2660M-TI supports input voltages as low as 1.5V when the LV pin is tied to GND to bypass the internal regulator. This configuration ensures stable operation and optimal efficiency for single-cell alkaline or NiMH batteries. The LM2660M-TI maintains ≥88% conversion efficiency at 100 mA even at 1.5V input, as verified in the National Semiconductor datasheet DS012911.
What capacitor types and values are recommended for LM2660M-TI?
TI recommends low-ESR ceramic or tantalum capacitors (≤0.2 Ω ESR) for both flying capacitor C1 and output capacitor C2. Typical values are 10 µF–150 µF; 150 µF is specified in electrical characteristics testing. Ceramic capacitors minimize ripple and output resistance, while tantalum types (e.g., AVX TPS series) offer stable performance across temperature. The LM2660M-TI's output resistance and ripple scale directly with capacitor ESR and value.
Is LM2660M-TI pin-compatible with LMC7660?
The LM2660M-TI is functionally and physically pin-compatible with the LMC7660 in SO-8 packages, sharing identical pin assignments for V+, GND, OUT, CAP+, CAP−, OSC, and LV. However, the LM2660M-TI adds the FC pin (Pin 1), which is a no-connect on the LMC7660. When substituting, leaving FC open configures the LM2660M-TI to match LMC7660's default 10 kHz operation-making it a direct upgrade path.
LM2660M-TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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-TI FAQ
1.How can I place an order for LM2660M-TI through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2660M-TI 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-TI reliable?
The price and inventory of LM2660M-TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2660M-TI is usually 5 days.
3.What payment methods are accepted for LM2660M-TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2660M-TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2660M-TI?
LM2660M-TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2660M-TI 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-TI?
For technical support, including LM2660M-TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2660M-TI requirements.
6.How does Aetrix verify that LM2660M-TI is sourced from the original manufacturer or authorized distributors?
All LM2660M-TI 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-TI meets industry standards.
7.What is the process for return or replacement of LM2660M-TI?
All LM2660M-TI units undergo pre-shipment inspection (PSI). If there is an issue with LM2660M-TI, 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-TI part is unused and in its original packaging.
Return procedure for LM2660M-TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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