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Texas Instruments LMC7660IN/NOPB
- Part No.:
- LMC7660IN/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LMC7660IN/NOPB.pdf
- Description:
- IC REG CHARGE PUMP 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,121
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Product details
Overview
LMC7660IN/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 PDIP package - used in dual-supply generation for op-amp biasing and portable instrumentation.
For engineers reviewing the LMC7660IN/NOPB datasheet, LMC7660IN/NOPB pinout, LMC7660IN/NOPB application, or LMC7660IN/NOPB equivalent, key selection criteria include its diodeless operation over full voltage/temperature range, low-quiescent-current capability down to 10 μA via external timing capacitor, and compatibility with legacy 7660 designs while eliminating output-series-diode losses.
Technical Context
The LMC7660IN/NOPB integrates four large CMOS switches driven 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 diodes.
It supports three operating modes: standard inversion (VOUT = −VIN), half-supply generation (VOUT = VIN/2), and synchronized operation via external clock applied to Pin 7 - where the internal ÷2 circuit ensures pumping frequency equals half the input clock rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.5V to +10V - enables direct battery-powered operation from single-cell alkaline (1.5V) up to 9V PP3 or regulated rails. |
| Output Voltage Range | −1.5V to −10V - provides rail-to-rail negative supply matching input magnitude, critical for bipolar op-amp biasing. |
| Supply Current | 120 μA typ / 200 μA max at V+ = 5V - allows μPower systems (e.g., handheld meters) to sustain >1-year battery life. |
| Voltage Conversion Efficiency | 97% min at no load - minimizes energy loss during inversion, reducing heat rise in sealed enclosures. |
| Oscillator Frequency | 10 kHz nominal - sets default switching rate; adjustable down to ~100 Hz using external Cosc to cut supply current to ~10 μA. |
| Output Source Resistance | 55 Ω typ at 20 mA load - defines maximum deliverable current before >100 mV droop; limits usable load to ≤15 mA at ±5V output. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded systems including sensor signal conditioning and data acquisition front-ends. |
Pinout & Package
LMC7660IN/NOPB uses an 8-pin plastic dual in-line package (PDIP) with 0.3-inch body width and 0.1-inch lead pitch, compliant with JEDEC MS-001, rated for 1.4W power dissipation and 90°C/W thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (GND) | Ground Reference | Common return path for all internal circuitry and external capacitors; must be low-impedance connection. |
| Pin 2 (Cp) | Pump Capacitor Terminal | Connects to positive plate of external pump capacitor Cp; polarity must match datasheet Figure 1. |
| Pin 3 (Cr) | Reservoir Capacitor Terminal | Connects to negative plate of reservoir capacitor Cr; forms output storage node with polarity-sensitive electrolytic. |
| Pin 4 (V+) | Positive Input Supply | Accepts +1.5V to +10V unregulated input; internal regulator activates above 6.5V to reduce power dissipation. |
| Pin 5 (LV) | Low-Voltage Mode Control | Short to GND for V+ ≤3.5V to improve low-voltage efficiency; must remain open for V+ ≥3.5V to avoid damage. |
| Pin 6 (OSC) | Oscillator Timing Node | Connects external Cosc capacitor to lower oscillator frequency and quiescent current; open for default 10 kHz operation. |
| Pin 7 (CLK) | External Clock Input | Overrides internal oscillator when driven with CMOS-level square wave; pumping frequency = CLK/2. |
| Pin 8 (V−) | Negative Output | Delivers inverted output voltage; requires external reservoir capacitor Cr and load decoupling per application layout. |
Key Features
| Feature | Design Value |
|---|---|
| Diodeless Operation | Eliminates series diode voltage drop and forward-conduction loss, enabling full −V+ output amplitude and <100 mΩ effective output impedance at light loads. |
| Pin-for-Pin Compatibility | Direct replacement for legacy 7660 ICs without PCB modification, retaining identical footprint and terminal functions. |
| Adjustable Oscillator | External Cosc capacitor reduces switching frequency from 10 kHz to <100 Hz, cutting supply current to ~10 μA for ultra-low-power backup supplies. |
| Latchup Immunity | Integrated substrate biasing prevents destructive latchup under full temperature/voltage range, removing need for external protection diodes. |
| Half-Supply Generation | Reconfigurable as precision V+/2 reference for single-supply sensor interfaces or mid-rail biasing in ADC drivers. |
Applications
| Portable Instrumentation Power | Op-Amp Dual-Supply Biasing |
|---|---|
Use Scenario: Handheld multimeters and battery-powered data loggers require isolated negative supply for analog front-end op-amps while minimizing quiescent drain. IC Role / Device Role / Timing Role: LMC7660IN/NOPB acts as a compact, diodeless charge-pump inverter generating −5V from +5V or −3.3V from +3.3V to power rail-to-rail input/output amplifiers. Use Value: Enables >2-year battery life on two AA cells by maintaining 200 μA max supply current and eliminating diode conduction losses. |
Use Scenario: Single-supply microcontroller-based systems need clean ±2.5V rails for precision op-amp signal conditioning without dedicated negative regulators. IC Role / Device Role / Timing Role: LMC7660IN/NOPB serves as a low-noise, low-ripple negative rail generator referenced to system ground, supporting high-PSRR analog stages. Use Value: Delivers stable −2.5V output with <50 mV ripple at 5 mA load, avoiding EMI from inductive switchers and simplifying PCB layout. |
| μPower Thermometer Front-End | Split-Rail Sensor Interface |
Use Scenario: Low-power temperature monitoring systems (e.g., remote environmental sensors) must measure −55°C to +125°C using LM35 while drawing <200 μA total. IC Role / Device Role / Timing Role: LMC7660IN/NOPB generates −5V to bias LM35's output stage for negative-temperature operation, synchronized with LP2951 regulation. Use Value: Achieves full 180°C span with only 150 μA total system current by combining diodeless inversion and adjustable regulation. |
Use Scenario: Industrial sensor transmitters with 4–20 mA loop power use single +24V supply but require ±12V rails for isolation amplifier biasing. IC Role / Device Role / Timing Role: LMC7660IN/NOPB configured in half-supply mode creates precise +12V mid-rail reference for level-shifting and differential signaling. Use Value: Provides 0.1% initial accuracy V+/2 output without trimming, enabling accurate 4–20 mA current-loop offset calibration. |
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 | Same electrical specs and pinout, but in SOIC-8 package (3.9 mm × 4.9 mm) with 0.6W power rating and 160°C/W θJA. | Better suited for space-constrained PCBs and automated assembly; lower thermal mass limits continuous 20 mA output in ambient >60°C. | Select LMC7660IM/NOPB for surface-mount production; retain LMC7660IN/NOPB for through-hole prototyping or high-reliability industrial modules. |
| MAX1044CPA+ | Requires external diodes for latchup protection; 100 μA typical supply current; 85% voltage efficiency; supports up to ±18V output via cascading. | Used where higher output voltage or multi-stage inversion is required, but adds 0.3V diode drop and needs extra BOM components. | Choose MAX1044CPA+ only when >−10V output or legacy design continuity with diode-based topologies is mandatory. |
Compared with LMC7660IM/NOPB, the LMC7660IN/NOPB offers superior thermal derating in high-ambient environments due to its PDIP package's 1.4W power handling and 90°C/W θJA, while MAX1044CPA+ trades efficiency and simplicity for extended voltage range at the cost of added diodes and reduced light-load efficiency.
Availability
LMC7660IN/NOPB is available at Aetrix Electronics and suitable for portable instrumentation power, op-amp dual-supply biasing, and μPower thermometer front-ends requiring stable component supply across industrial temperature ranges and long-lifecycle programs.
Supply support for LMC7660IN/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, with decades of expertise in precision power management ICs.
The LMC7660IN/NOPB belongs to TI's legacy precision analog portfolio designed specifically for low-power, low-noise voltage conversion in battery-operated and space-constrained systems.
FAQ
What is the maximum input voltage the LMC7660IN/NOPB can accept?
The LMC7660IN/NOPB has an absolute maximum supply voltage rating of 10.5V, with guaranteed operation from +1.5V to +10V. Exceeding 10.5V risks permanent damage to internal MOS switches and oscillator circuitry. For reliable long-term use, keep V+ ≤10V and ensure transient spikes are clamped below 10.5V using external Zener or TVS protection.
Can the LMC7660IN/NOPB generate voltages other than −V+?
Yes - the LMC7660IN/NOPB supports multiple configurations beyond basic inversion. When wired per Figure 17 in the datasheet, it functions as a precision V+/2 divider. With external diodes (Figure 18), it becomes a positive voltage doubler. Cascading two units (Figure 15) yields −2×V+, and paralleling devices (Figure 14) lowers output impedance. All modes retain the same pin assignments and internal switching architecture.
How does the LV pin affect LMC7660IN/NOPB performance?
The LV pin (Pin 5) enables low-voltage optimization: shorting it to GND improves efficiency and regulation for V+ ≤3.5V by bypassing the internal regulator. Leaving it open is mandatory for V+ ≥3.5V - connecting LV to GND above this threshold causes irreversible damage due to internal node overstress. This pin has no function in standard 5V or 9V applications unless explicitly operating near 1.5V.
Is the LMC7660IN/NOPB RoHS compliant?
Yes - the LMC7660IN/NOPB carries the "/NOPB" suffix indicating lead-free, RoHS-compliant construction with green (halogen-free) molding compound and Sn (matte tin) lead finish. It meets EU RoHS Directive 2011/65/EU requirements for all 10 restricted substances, including Pb, Cd, Hg, Cr⁶⁺, PBB, and PBDE, with concentrations ≤0.1% by weight in homogeneous materials.
What external components are required for basic LMC7660IN/NOPB operation?
Only two polarized electrolytic capacitors are mandatory: a pump capacitor (Cp, typically 10–100 μF) between Pins 2 and 4, and a reservoir capacitor (Cr, typically 10–100 μF) between Pins 3 and 8. Both must observe correct polarity per Figure 1. No diodes, inductors, or resistors are needed for standard inversion - making LMC7660IN/NOPB one of the simplest charge-pump solutions available.
LMC7660IN/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LMC7660IN/NOPB FAQ
1.How can I place an order for LMC7660IN/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC7660IN/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 LMC7660IN/NOPB reliable?
The price and inventory of LMC7660IN/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC7660IN/NOPB is usually 5 days.
3.What payment methods are accepted for LMC7660IN/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC7660IN/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC7660IN/NOPB?
LMC7660IN/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC7660IN/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 LMC7660IN/NOPB?
For technical support, including LMC7660IN/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC7660IN/NOPB requirements.
6.How does Aetrix verify that LMC7660IN/NOPB is sourced from the original manufacturer or authorized distributors?
All LMC7660IN/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 LMC7660IN/NOPB meets industry standards.
7.What is the process for return or replacement of LMC7660IN/NOPB?
All LMC7660IN/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMC7660IN/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 LMC7660IN/NOPB part is unused and in its original packaging.
Return procedure for LMC7660IN/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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