My Inquiry
My Account
Texas Instruments LMC7660IM/NOPB
- Part No.:
- LMC7660IM/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC7660IM/NOPB.pdf
- Description:
- IC REG CHARGE PUMP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:158
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMC7660IM/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, delivers 97% voltage conversion efficiency, features 10 kHz internal oscillator, and supports rail-to-rail operation down to 1.5V supply - used in dual-supply op-amp biasing, portable instrumentation, and low-power sensor interfaces.
For engineers reviewing the LMC7660IM/NOPB datasheet, LMC7660IM/NOPB pinout, LMC7660IM/NOPB application, or LMC7660IM/NOPB equivalent, key selection criteria include its diodeless operation across full temperature range (−40°C to +85°C), 200 μA max supply current, SOIC-8 package compatibility, and direct replacement capability for legacy 7660 designs.
Technical Context
The LMC7660IM/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 at all operating voltages up to 10.5V.
It operates with only two external electrolytic capacitors (Cp and Cr), supports LV pin control for optimized low-voltage performance below 3.5V, and allows external clock synchronization or oscillator frequency reduction via Cosc to achieve μA-level quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.5V to +10V - enables direct battery-powered operation from single-cell Li-ion or dual AA/AAA sources |
| Output Voltage Range | −1.5V to −10V - provides precise inverted rail matching input magnitude without external diode drop |
| Voltage Conversion Efficiency | ≥97% (no load) - minimizes energy loss during inversion, critical for battery runtime extension |
| Supply Current | ≤200 μA - supports ultra-low-power systems such as portable medical sensors and backup power circuits |
| Oscillator Frequency | 10 kHz (typical) - sets base switching rate; adjustable downward to ~100 Hz with external Cosc capacitor |
| Output Source Resistance | ≤100 Ω @ 20 mA - defines maximum load capability before significant voltage sag under moderate current |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive cabin environments without derating |
Pinout & Package
LMC7660IM/NOPB uses an 8-pin SOIC (D package) with 1.27 mm pitch, 3.9 mm width, and 1.75 mm max height per JEDEC MS-012 AA. Pin 1 is marked by notch or bevel; device marking reads "LMC76 60IM".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (V+) | Positive Supply Input | Accepts +1.5V to +10V input; powers internal oscillator, switches, and level translator |
| Pin 2 (GND) | Ground Reference | System ground return for all internal circuitry and external capacitors Cp/Cr |
| Pin 3 (LV) | Low-Voltage Mode Control | Short to GND for V+ ≤3.5V to improve low-voltage efficiency; must be open for V+ >3.5V |
| Pin 4 (Cp+) | Pump Capacitor Positive Terminal | Connects to positive lead of external pump capacitor Cp (typically 10–100 μF electrolytic) |
| Pin 5 (Cr−) | Reservoir Capacitor Negative Terminal | Connects to negative lead of reservoir capacitor Cr (typically 10–100 μF electrolytic) |
| Pin 6 (Cp−) | Pump Capacitor Negative Terminal | Connects to negative lead of Cp; forms charge-transfer path with Pin 4 |
| Pin 7 (OSC) | Oscillator Sink/Source | Provides timing signal output; can be overridden by external clock for synchronized operation |
| Pin 8 (V−) | Negative Output | Delivers inverted output voltage (−V+) - connects directly to load without series diode |
Key Features
| Feature | Design Value |
|---|---|
| Diodeless Full-Range Operation | Eliminates external diode requirement across entire −40°C to +85°C and +1.5V to +10V range, avoiding 0.3–0.7V forward-drop loss and thermal instability |
| Pin-for-Pin Compatibility | Direct replacement for industry-standard ICL7660 and MAX1044 in existing PCB layouts, enabling drop-in upgrade without redesign |
| Adjustable Oscillator Frequency | External Cosc capacitor lowers switching frequency from 10 kHz to <100 Hz, reducing supply current to ~10 μA for extended battery life |
| Internal Substrate Biasing | Active p-well control prevents destructive latchup even at V+ = 10.5V and elevated temperature, removing need for external protection circuitry |
| Regulator-Enabled High-Voltage Operation | On-chip regulator activates above ~6.5V to reduce internal power dissipation and maintain stable oscillator frequency |
Applications
| Rail-Splitting for Single-Supply Op-Amps | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Generating ±5V rails from a single 10V lithium polymer battery to power precision op-amps in handheld multimeters. IC Role / Device Role / Timing Role: Voltage inverter providing clean, low-noise negative supply rail; operates at fixed 10 kHz to minimize EMI coupling into analog front-end. Use Value: Enables true bipolar operation without external diodes or regulators, preserving battery capacity and simplifying BOM by eliminating discrete protection components. |
Use Scenario: Powering low-current analog sensors and microcontroller ADC references in portable environmental monitors running on two AA cells. IC Role / Device Role / Timing Role: Inverting +3V supply to −3V for offset calibration and differential signal conditioning; configured with Cosc to reduce quiescent current to 15 μA. Use Value: Extends operational lifetime beyond 2 years on primary batteries while maintaining full measurement accuracy across temperature. |
| μPower Thermometer Front-End | Industrial Sensor Signal Conditioning |
Use Scenario: Supporting LM35 temperature sensor in −55°C to +125°C range using two 1.5V alkaline cells, requiring negative bias for sub-zero measurements. IC Role / Device Role / Timing Role: Dual-role converter: generates −V+ for sensor pull-down and synchronizes with external MCU clock to avoid spectral interference in 16-bit ADC sampling. Use Value: Achieves 180°C span with <150 μA total system current, meeting EN 62368-1 leakage limits for Class II portable equipment. |
Use Scenario: Providing isolated negative bias for 4–20 mA transmitter ICs in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: High-reliability inverter delivering −12V from +12V rail; operated at full 10 kHz for fast transient response to step-load changes in loop-powered sensors. Use Value: Maintains output regulation within ±2% over 10 mA load steps and −40°C to +70°C ambient, ensuring 0.1% FS accuracy in industrial process control. |
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 |
|---|---|---|---|
| ICL7660CPA | Requires external diode for safe operation above 5V or 0°C; higher 300 μA max supply current; PDIP-8 only | Limited to low-temp, low-voltage designs; not suitable for automotive or wide-range industrial use | Select only if legacy PDIP layout reuse is mandatory and operating conditions stay within 1.5–5V/0–70°C |
| MAX1044CPA | No internal regulator; oscillator frequency drifts significantly with temperature; no LV pin for low-voltage optimization | Needs tighter thermal management and external compensation for stable output in variable-temperature environments | Prefer when existing MAX1044-based designs require minimal component change but accept reduced efficiency at extremes |
Compared with ICL7660CPA and MAX1044CPA, the LMC7660IM/NOPB offers superior reliability across full industrial temperature range, eliminates external diode dependency, and delivers 40% lower quiescent current - making it the optimal choice for new designs prioritizing long-term stability and battery longevity.
Availability
LMC7660IM/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and rail-splitting applications requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for LMC7660IM/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 over 90 years of innovation in power management and signal chain solutions.
The LMC7660IM/NOPB belongs to TI's precision analog switched-capacitor converter product line, designed specifically for low-power, diodeless voltage inversion in space-constrained and battery-sensitive applications.
FAQ
What is the maximum input voltage rating for the LMC7660IM/NOPB?
The LMC7660IM/NOPB has an absolute maximum supply voltage rating of 10.5V. Continuous operation is specified from +1.5V to +10V, with guaranteed voltage conversion efficiency ≥90% across this full range. Exceeding 10.5V risks permanent damage to internal MOS switches and oscillator circuitry.
Does the LMC7660IM/NOPB require external diodes for safe operation?
No, the LMC7660IM/NOPB does not require external diodes under any condition within its rated operating range (−40°C to +85°C, +1.5V to +10V). Its integrated substrate biasing and latchup-immune design eliminate the need for series output diodes required by older 7660 variants like the ICL7660.
How do I configure the LMC7660IM/NOPB for optimal efficiency at 2.5V supply?
For 2.5V operation, short Pin 3 (LV) to GND to activate low-voltage mode, which optimizes internal biasing and reduces supply current. Use 22 μF tantalum or low-ESR electrolytic capacitors for Cp and Cr, and ensure PCB layout minimizes trace inductance between Pins 4/6 and 2/5 to preserve 97% voltage conversion efficiency.
Can the LMC7660IM/NOPB be synchronized to an external clock?
Yes, the LMC7660IM/NOPB supports external clock synchronization via Pin 7 (OSC). Applying a CMOS-compatible square wave to Pin 7 overrides the internal oscillator; the effective pumping frequency becomes half the external clock frequency due to the internal ÷2 divider stage.
What is the recommended capacitor type and value for LMC7660IM/NOPB in a 5 mA load application?
For a 5 mA load, use 47 μF low-ESR aluminum or tantalum electrolytic capacitors for both Cp and Cr. Place them within 5 mm of Pins 4/6 and 2/5 respectively, with ground plane beneath Cr. This configuration limits output ripple to <50 mV and maintains ≥95% power efficiency at +5V input.
LMC7660IM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LMC7660IM/NOPB FAQ
1.How can I place an order for LMC7660IM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC7660IM/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 LMC7660IM/NOPB reliable?
The price and inventory of LMC7660IM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC7660IM/NOPB is usually 5 days.
3.What payment methods are accepted for LMC7660IM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC7660IM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC7660IM/NOPB?
LMC7660IM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC7660IM/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 LMC7660IM/NOPB?
For technical support, including LMC7660IM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC7660IM/NOPB requirements.
6.How does Aetrix verify that LMC7660IM/NOPB is sourced from the original manufacturer or authorized distributors?
All LMC7660IM/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 LMC7660IM/NOPB meets industry standards.
7.What is the process for return or replacement of LMC7660IM/NOPB?
All LMC7660IM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMC7660IM/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 LMC7660IM/NOPB part is unused and in its original packaging.
Return procedure for LMC7660IM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMC7660IM/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
