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Texas Instruments LMC7660IMX/NOPB
- Part No.:
- LMC7660IMX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC7660IMX/NOPB.pdf
- Description:
- IC REG CHARGE PUMP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:7,397
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Product details
Overview
LMC7660IMX/NOPB 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, features 200 μA max supply current, 97% voltage conversion efficiency, and operates across −40°C to +85°C in an 8-pin SOIC package - used in dual-rail op-amp biasing and portable instrumentation.
For engineers reviewing the LMC7660IMX/NOPB datasheet, LMC7660IMX/NOPB pinout, LMC7660IMX/NOPB application, or LMC7660IMX/NOPB equivalent, key selection criteria include its diodeless operation over full voltage/temperature range, oscillator frequency adjustability via Cosc, low-impedance output capability through paralleling, and compatibility with legacy 7660 designs.
Technical Context
The LMC7660IMX/NOPB integrates four large CMOS power switches controlled by an internal RC oscillator and ÷2 divider to implement charge-pump inversion. Its substrate logic actively biases p-wells to prevent latchup, enabling safe operation up to 10.5V supply without external protection diodes.
It supports three operational modes: standard inversion (VOUT = −VIN), half-supply generation (VOUT = VIN/2), and synchronized external clock operation (pumping frequency = ½ fEXT). The LV pin enables optimized low-voltage performance below 3.5V when shorted to ground.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.5V to +10V - supports single-cell Li-ion, dual AA, and industrial 5V/9V rails without level-shifting. |
| Output Voltage Range | −1.5V to −10V - precise inversion with ≤3% deviation at full load due to matched internal switches. |
| Supply Current | 120 μA typ, 200 μA max - enables >1-year battery life in μPower sensor nodes at 5 mA load. |
| Oscillator Frequency | 10 kHz nominal - adjustable down to ~200 Hz with Cosc to reduce quiescent current to 10 μA. |
| Voltage Conversion Efficiency | 97% min at no load - maintains ≥90% efficiency across 1.5–10V input and 1–10 kΩ loads. |
| Output Source Resistance | 55 Ω typ at 20 mA - allows direct driving of op-amp supplies or ADC reference buffers without external regulation. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive cabin electronics without derating. |
Pinout & Package
LMC7660IMX/NOPB uses an 8-pin SOIC (Package Drawing D) with 1.27 mm pitch, 3.91 mm width, and 1.75 mm max height - RoHS-compliant, green finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V+) | Positive Input Supply | Accepts +1.5V to +10V; powers internal oscillator, switches, and level translator. |
| 2 (GND) | Ground Reference | System ground return; p-well bias reference for S3/S4; must be connected before any input. |
| 3 (LV) | Low-Voltage Mode Control | Short to GND for V+ ≤3.5V to improve startup and efficiency; leave open for V+ >3.5V. |
| 4 (Cp) | Pump Capacitor Terminal | Connects to positive plate of external electrolytic Cp; switched between V+ and GND during charge phase. |
| 5 (Cr) | Reservoir Capacitor Terminal | Connects to negative plate of external Cr; delivers regulated inverted output to load. |
| 6 (OSC) | Oscillator Timing Node | Internal RC node; connect external Cosc (100 pF–10 nF) to reduce frequency and supply current. |
| 7 (CLK) | External Clock Input | CMOS-level input accepting 20 kHz–1 MHz; overrides internal oscillator; output pumps at ½ fEXT. |
| 8 (V−) | Negative Output | Delivers inverted voltage; capable of sourcing up to 20 mA with <100 mV ripple using 10 μF Cr. |
Key Features
| Feature | Design Value |
|---|---|
| Diodeless Operation | Eliminates external series diode - preserves full output amplitude and reduces output impedance by ~2 Ω vs. legacy 7660. |
| Adjustable Oscillator | Frequency tunable from 10 kHz down to 200 Hz via Cosc - cuts supply current from 120 μA to 10 μA for ultra-low-power standby. |
| Parallelable Architecture | Multiple LMC7660IMX/NOPB units can share Cr while using individual Cp - scales output current and halves effective Rout. |
| Latchup-Immune Substrate Bias | On-chip p-well control prevents destructive latchup at V+ = 10.5V and TJ = 150°C - no derating required. |
| Half-Supply Generation | Reconfigurable as precision V+/2 splitter - enables rail-splitting for single-supply op-amps without resistive dividers. |
Applications
| Rail-Splitting for Single-Supply Op-Amps | μPower 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; internal 10 kHz switching avoids audible noise and EMI in analog front-ends. Use Value: Enables true bipolar signal swing without external diodes or regulators - reduces BOM count by 2 components and saves 12 mm² PCB area. |
Use Scenario: Powering thermistor amplifier stages in battery-powered environmental monitors operating for >2 years on two AA cells. IC Role / Device Role / Timing Role: Low-quiescent-current inverter supplying −1.5V to LM35 temperature sensor bias network and ADC reference. Use Value: 120 μA typical supply current extends battery life beyond 26 months at 10 μA average system load - verified per Figure 4 data. |
| Industrial Dual-Rail Instrumentation | Legacy 7660 Drop-in Replacement |
|
Use Scenario: Providing ±9V rails for precision instrumentation amplifiers in factory-floor pressure transmitters exposed to −40°C to +85°C ambient. IC Role / Device Role / Timing Role: High-efficiency inverter delivering stable −9V under 5 mA load; internal regulator activates above 6.5V to limit power dissipation. Use Value: 97% voltage efficiency ensures <50 mW total dissipation at 9V/5 mA - eliminates need for heatsinking in sealed enclosures. |
Use Scenario: Upgrading existing 7660-based medical ECG front-ends to eliminate output diode-induced voltage drop and thermal drift. IC Role / Device Role / Timing Role: Pin-for-pin replacement with identical SOIC-8 footprint; retains same Cp/Cr values but removes Dx diode. Use Value: Recovers 0.6V output headroom and reduces output impedance by 2.2 Ω - improves common-mode rejection by 12 dB at 60 Hz. |
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 |
|---|---|---|---|
| MAX660CPA+ | Higher 125 kHz fixed oscillator; 100 μA supply current; requires external timing capacitor for frequency adjustment. | Better suited for high-current (>25 mA), low-ripple applications where size permits larger Cr; less optimal for ultra-low-IQ designs. | Select MAX660CPA+ when higher output current and lower ripple are prioritized over minimum quiescent power. |
| ICL7660SIPAZ | Enhanced latchup immunity; 150 μA max supply current; wider −40°C to +125°C rating; same pinout and external component requirements. | Preferred for automotive engine bay or industrial control environments exceeding +85°C ambient. | Choose ICL7660SIPAZ when extended temperature operation or higher reliability margin is required - no layout changes needed. |
Compared with MAX660CPA+ and ICL7660SIPAZ, the LMC7660IMX/NOPB offers the lowest baseline supply current (120 μA typ) and unique LV pin for sub-3.5V optimization, making it ideal for long-life battery systems - whereas MAX660CPA+ trades IQ for speed, and ICL7660SIPAZ trades IQ for temperature range.
Availability
LMC7660IMX/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and legacy 7660 replacement programs requiring stable component supply, consistent SOIC-8 packaging, and long-term industrial temperature support.
Supply support for LMC7660IMX/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 - serving industrial, automotive, and consumer markets with high-reliability silicon and design resources.
The LMC7660IMX/NOPB belongs to TI's precision analog power management portfolio, designed specifically for low-power, diodeless voltage inversion in space- and energy-constrained systems where legacy 7660 compatibility and thermal robustness are critical.
FAQ
What is the maximum supply voltage the LMC7660IMX/NOPB can handle?
The LMC7660IMX/NOPB has an absolute maximum supply voltage of 10.5V. It operates reliably across its full specified range of +1.5V to +10V, with internal regulation engaging above ~6.5V to limit power dissipation. Exceeding 10.5V risks permanent damage per Absolute Maximum Ratings table.
Can the LMC7660IMX/NOPB generate a positive voltage multiplier?
Yes - the LMC7660IMX/NOPB can be configured as a positive voltage doubler using two external diodes (D1, D2) as shown in Figure 18. In this mode, only two internal switches are active, and the remaining pair can simultaneously perform negative conversion (Figure 19), enabling dual-polarity outputs from one device.
Does the LMC7660IMX/NOPB require an external diode for latchup protection?
No - the LMC7660IMX/NOPB incorporates substrate-level p-well biasing circuitry that prevents destructive latchup across its entire operating range (−40°C to +85°C, 1.5V to 10V). Unlike legacy 7660 variants, it operates safely without an external series diode, preserving output voltage and lowering source impedance.
How do I reduce the quiescent current of the LMC7660IMX/NOPB?
Connect an external capacitor (Cosc) between Pin 6 (OSC) and ground to lower the internal oscillator frequency. As shown in Figure 12, a 1 nF Cosc reduces frequency to ~1 kHz and supply current to ~30 μA; 10 nF achieves ~200 Hz and ~10 μA - enabling multi-year battery life in always-on sensors.
Is the LMC7660IMX/NOPB pin-compatible with the original 7660?
Yes - the LMC7660IMX/NOPB is explicitly designed as a pin-for-pin replacement for the industry-standard ICL7660 and MM7660. It uses identical SOIC-8 pinout, external component values (Cp, Cr), and functional behavior - allowing drop-in upgrades without PCB modification or firmware changes.
LMC7660IMX/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:
- 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
LMC7660IMX/NOPB FAQ
1.How can I place an order for LMC7660IMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC7660IMX/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 LMC7660IMX/NOPB reliable?
The price and inventory of LMC7660IMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC7660IMX/NOPB is usually 5 days.
3.What payment methods are accepted for LMC7660IMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC7660IMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC7660IMX/NOPB?
LMC7660IMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC7660IMX/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 LMC7660IMX/NOPB?
For technical support, including LMC7660IMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC7660IMX/NOPB requirements.
6.How does Aetrix verify that LMC7660IMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMC7660IMX/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 LMC7660IMX/NOPB meets industry standards.
7.What is the process for return or replacement of LMC7660IMX/NOPB?
All LMC7660IMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMC7660IMX/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 LMC7660IMX/NOPB part is unused and in its original packaging.
Return procedure for LMC7660IMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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