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Texas Instruments LMC7660IM
- Part No.:
- LMC7660IM
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC7660IM.pdf
- Description:
- IC REG CHARGE PUMP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,909
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Product details
Overview
LMC7660IM from Texas Instruments is a CMOS switched-capacitor voltage converter that inverts +1.5V to +10V input to −1.5V to −10V output without external diodes, delivers 97% voltage conversion efficiency, features 10 kHz internal oscillator, and supports rail-to-rail operation down to 1.5V - used in dual-supply op-amp biasing, portable instrumentation, and low-power sensor interfaces.
For engineers reviewing the LMC7660IM datasheet, LMC7660IM pinout, LMC7660IM application, or LMC7660IM equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and layout implications.
Technical Context
The LMC7660IM uses an integrated RC oscillator and ÷2 divider to drive four CMOS power switches (two P-channel, two N-channel) in complementary phase pairs, enabling charge-pump inversion without external rectifiers. Its substrate-level logic ensures safe p-well biasing across the full −40°C to +85°C operating range.
Internal regulation activates above 6.5V supply to reduce power dissipation; the LV pin enables optimized low-voltage operation below 3.5V. Output impedance is actively managed via switch Ron matching and capacitor charge redistribution timing, yielding 55 Ω typical source resistance at 20 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | +1.5V to +10V - supports single-cell Li-ion, dual AA/AAA, and industrial 5V/9V rails without external level-shifting. |
| Output Voltage | −1.5V to −10V - exact inversion with ≤3% deviation under no-load, enabling precision negative bias for rail-splitting and op-amp supplies. |
| Voltage Efficiency | ≥97% - minimizes energy loss during charge transfer, critical for battery runtime in μPower systems. |
| Oscillator Freq | 10 kHz nominal - fixed internal frequency simplifies design; adjustable down to ~200 Hz via external Cosc for <15 μA quiescent current. |
| Supply Current | 120 μA typ / 200 μA max - enables multi-year operation from coin cells in backup or sensor nodes. |
| Output Resistance | 55 Ω typ at 20 mA - defines maximum load capability before >5% output droop; scalable via paralleling. |
| Operating Temp | −40°C to +85°C - qualified for industrial and automotive cabin environments without derating. |
Pinout & Package
LMC7660IM is housed in an 8-pin SOIC (Package Drawing D), 3.9 mm × 4.9 mm body, 1.75 mm max height, RoHS-compliant, tape-and-reel packaged (2500 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V+) | Positive Input Supply | Accepts +1.5V to +10V; powers internal oscillator, logic, and switches - must be stable and low-impedance. |
| 2 (GND) | Ground Reference | System ground return for all internal circuitry; requires low-inductance connection to minimize switching noise. |
| 3 (LV) | Low-Voltage Mode Control | Short to GND for V+ ≤3.5V to optimize efficiency; leave open for V+ ≥3.5V to prevent damage. |
| 4 (Cp+) | Pump Capacitor Positive Terminal | Connects to positive plate of external pump capacitor Cp; driven by internal S1/S3 switches. |
| 5 (Cp−) | Pump Capacitor Negative Terminal | Connects to negative plate of Cp; driven by internal S2/S4 switches - polarity must match electrolytic rating. |
| 6 (Cr+) | Reservoir Capacitor Positive Terminal | Connects to positive plate of reservoir capacitor Cr; forms output filter node with Cr− (Pin 7). |
| 7 (Cr−) | Reservoir Capacitor Negative Terminal | Connects to negative plate of Cr; tied to output (Pin 8); establishes −Vout reference point. |
| 8 (V−) | Negative Output | Delivers inverted output voltage; rated for continuous short-circuit at V+ ≤5.5V; max load 20 mA typical. |
Key Features
| Feature | Design Value |
|---|---|
| No-external-diode inversion | Eliminates series diode drop and conduction loss - preserves full −V+ amplitude and reduces thermal stress. |
| Pin-for-pin 7660 replacement | Direct drop-in upgrade for legacy ICL7660/7660A designs - no PCB change required when replacing with LMC7660IM. |
| Adjustable oscillator frequency | External Cosc capacitor lowers switching frequency to ~200 Hz, cutting supply current to <15 μA for ultra-low-power modes. |
| Internal substrate protection | On-chip p-well biasing prevents latch-up across full temperature and voltage range - no external protection needed. |
| Regulated oscillator bias | Internal regulator engages above 6.5V to clamp oscillator current - maintains stable 10 kHz operation without efficiency penalty. |
Applications
| Rail-Splitting for Single-Supply Op-Amps | Battery-Powered Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Generating ±2.5V from a 5V microcontroller supply to bias rail-to-rail op-amps in portable data loggers. IC Role / Device Role / Timing Role: Voltage inverter providing clean, low-noise negative rail - operates at fixed 10 kHz to avoid audible switching artifacts. Use Value: Enables true bipolar signal swing without external diodes or extra regulators, reducing BOM count by 3 components and saving 12 mm² PCB area. |
Use Scenario: Powering low-noise instrumentation amplifiers in wireless environmental sensors powered by two AA batteries (2.4–3.2V). IC Role / Device Role / Timing Role: Inverting supply generator with LV pin grounded - extends battery life by lowering quiescent current to 120 μA. Use Value: Delivers stable −2.4V to −3.2V output while drawing <130 μA total, enabling >5-year operation on primary alkaline cells. |
| μPower Thermometer Front-End | Negative Regulated Supply for Precision ADCs |
|
Use Scenario: Supporting LM35 temperature sensor in −55°C to +125°C measurement range using two 1.5V cells. IC Role / Device Role / Timing Role: Core charge-pump inverter combined with Schottky diodes - operates at reduced oscillator frequency to limit supply current. Use Value: Supplies regulated −1.25V to −1.5V pull-down for LM35's negative temperature range while consuming only 150 μA total system current. |
Use Scenario: Providing −5V regulated supply to SAR ADC reference buffers in industrial PLC analog input modules. IC Role / Device Role / Timing Role: Unregulated inverter stage feeding LP2951 adjustable negative regulator - uses LMC7660IM's 55 Ω output impedance for stable loop response. Use Value: Achieves ±0.5% output regulation at 10 mA load with 200 μA standby current - eliminates need for discrete negative LDO. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7660CPA | Requires external output diode for latch-up immunity above 3.5V; 120 μA typical supply current; PDIP-8 only. | Limited to ≤3.5V operation without diode; higher output impedance (120 Ω); not suitable for compact SOIC layouts. | Select only for legacy PDIP board reuse or cost-sensitive non-automotive designs where diode overhead is acceptable. |
| MAX680CPA | Higher 125 kHz oscillator; 100 μA typical supply current; includes shutdown control; PDIP-8/SOIC-8 options. | Delivers lower output ripple at same load but consumes more dynamic power; requires external shutdown logic. | Prefer when fast transient response or programmable enable is required - not drop-in due to different pinout and control interface. |
Compared with ICL7660CPA, LMC7660IM eliminates the external diode and supports full 1.5–10V range safely; compared with MAX680CPA, it offers lower quiescent current and simpler control but trades off switching speed and ripple performance.
Availability
LMC7660IM is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and rail-splitting circuits requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LMC7660IM 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 focus on reliability, precision, and power efficiency.
The LMC7660IM belongs to TI's precision analog switched-capacitor product line, engineered specifically for low-quiescent-current DC-DC voltage inversion in space- and power-constrained systems.
FAQ
What is the maximum input voltage the LMC7660IM can handle?
The LMC7660IM supports a maximum supply voltage of +10.5V absolute rating, with recommended continuous operation up to +10V. Exceeding +10.5V risks permanent damage per Absolute Maximum Ratings. The device regulates internal oscillator bias above +6.5V to maintain stable 10 kHz operation and prevent excessive power dissipation - ensuring reliable function across its full +1.5V to +10V specified range. Always observe the 10.5V limit in LMC7660IM designs.
Can the LMC7660IM replace older 7660-series ICs without PCB changes?
Yes, the LMC7660IM is explicitly designed as a pin-for-pin replacement for industry-standard 7660 devices including ICL7660 and LT1026. It uses identical SOIC-8 pinout, shares compatible capacitor values and layout guidelines, and eliminates the need for external output diodes required by earlier versions to prevent latch-up. No PCB modifications are necessary when upgrading to LMC7660IM - making it ideal for production refreshes and second-source qualification.
How does the LV pin affect LMC7660IM operation below 3.5V supply?
The LV pin on the LMC7660IM must be shorted to ground when the input supply is ≤3.5V to activate low-voltage optimization mode - improving oscillator efficiency and reducing supply current to 120 μA typical. Leaving LV open at low V+ causes improper internal biasing and may result in erratic oscillation or failure to start. For V+ ≥3.5V, LV must remain open; connecting it to ground in that condition risks device damage per the datasheet.
What output current capability does the LMC7660IM provide?
The LMC7660IM delivers up to 20 mA continuous output current with ≤5% regulation error under typical conditions. Its 55 Ω typical output source resistance determines voltage droop: at 10 mA load, expect ~0.55V drop from ideal −V+. For higher loads, paralleling multiple LMC7660IM units (each with dedicated Cp) reduces effective output impedance - e.g., two devices cut Rout to ~28 Ω. Always verify thermal limits: SOIC package power dissipation is rated at 0.6W.
Is the LMC7660IM suitable for automotive applications?
The LMC7660IM is rated for −40°C to +85°C operation and meets industrial temperature requirements, but it is not AEC-Q200 qualified or specified for automotive under-hood use. While it functions reliably in automotive cabin environments (e.g., infotainment, dashboard sensors), TI does not guarantee performance under extended temperature cycling, vibration, or ISO 7637-2 transients. For automotive-grade designs, consult TI's automotive-qualified alternatives or perform full system-level validation - LMC7660IM remains appropriate for non-safety-critical, cabin-mounted electronics.
LMC7660IM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Ratiometric
- Output Configuration:
- Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- -Vin
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- 10kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LMC7660IM FAQ
1.How can I place an order for LMC7660IM through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC7660IM 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 LMC7660IM reliable?
The price and inventory of LMC7660IM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC7660IM is usually 5 days.
3.What payment methods are accepted for LMC7660IM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC7660IM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC7660IM?
LMC7660IM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC7660IM 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 LMC7660IM?
For technical support, including LMC7660IM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC7660IM requirements.
6.How does Aetrix verify that LMC7660IM is sourced from the original manufacturer or authorized distributors?
All LMC7660IM 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 LMC7660IM meets industry standards.
7.What is the process for return or replacement of LMC7660IM?
All LMC7660IM units undergo pre-shipment inspection (PSI). If there is an issue with LMC7660IM, 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 LMC7660IM part is unused and in its original packaging.
Return procedure for LMC7660IM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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