My Inquiry
My Account
Texas Instruments LMC7660IMX
- Part No.:
- LMC7660IMX
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC7660IMX.pdf
- Description:
- IC REG CHARGE PUMP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,931
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMC7660IMX 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, supports 10 kHz internal oscillator frequency, and operates across −40°C to +85°C for rail-splitting and dual-supply generation in portable instrumentation.
For engineers reviewing the LMC7660IMX datasheet, LMC7660IMX pinout, LMC7660IMX application, or LMC7660IMX equivalent, this device is selected for low-quiescent-current (200 μA max) negative supply generation where space-constrained designs require only two external electrolytic capacitors and no external diode.
Technical Context
The LMC7660IMX integrates four large CMOS power switches controlled by an internal RC oscillator and ÷2 divider to implement charge-pump inversion. Its substrate logic ensures p-well biasing prevents latchup across full temperature and voltage range.
It features built-in regulator activation above ~6.5V to reduce power dissipation, LV pin control for optimized low-voltage operation (≤3.5V), and internal level translation to drive S4 gate when output is biased below ground.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.5V to +10V - enables direct battery or low-voltage rail use without boost pre-regulation |
| Output Voltage Range | −1.5V to −10V - precise inversion with ≤3% deviation at full load and temperature extremes |
| Voltage Conversion Efficiency | ≥97% (no load) - minimizes energy loss in ultra-low-power systems like sensor nodes |
| Supply Current | 200 μA max - supports multi-year battery life in backup or portable applications |
| Oscillator Frequency | 10 kHz nominal - sets base switching rate; adjustable down to hundreds of Hz via Cosc for further current reduction |
| Output Source Resistance | 100 Ω max at 20 mA - defines minimum load capability and ripple under dynamic current draw |
| Operating Temperature | −40°C to +85°C - qualified for industrial and extended commercial environments |
Pinout & Package
LMC7660IMX 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 units/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (GND) | Ground reference | Common return for internal switches and oscillator; must be low-impedance connection |
| Pin 2 (Cp) | Pump capacitor terminal | Connects to positive plate of external pump capacitor Cp; critical for charge transfer timing |
| Pin 3 (Cr) | Reservoir capacitor terminal | Connects to negative plate of reservoir capacitor Cr; determines output voltage stability and ripple |
| Pin 4 (V+) | Positive input supply | Accepts +1.5V to +10V; powers internal oscillator, switches, and level translator |
| Pin 5 (LV) | Low-voltage mode control | Short to GND for V+ ≤3.5V to improve low-voltage performance; leave open otherwise |
| Pin 6 (OSC) | Oscillator timing node | External capacitor Cosc here lowers frequency and quiescent current; internal RC sets 10 kHz default |
| Pin 7 (SINK) | Oscillator sink/source | Provides oscillator bias current path; shorting Pin 7–8 disables device |
| Pin 8 (VOUT) | Negative output | Delivers inverted voltage −V+; output impedance depends on load, Cp/Cr values, and frequency |
Key Features
| Feature | Design Value |
|---|---|
| Pin-for-pin replacement for industry-standard 7660 | Enables drop-in upgrade in legacy designs without PCB changes or layout revision |
| No external diode required | Eliminates forward voltage drop and series resistance, preserving output voltage accuracy and efficiency |
| Internal substrate-level protection | Prevents destructive latchup across full −40°C to +85°C and +1.5V to +10V operating range |
| Adjustable oscillator frequency | External Cosc allows frequency scaling from ~10 kHz down to <1 kHz, reducing supply current to ~10 μA |
| Regulator-enabled high-voltage operation | Internal regulator activates at ~6.5V to limit power dissipation and maintain thermal safety |
Applications
| Rail Splitting for Single-Supply Op-Amps | Battery-Powered Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Generating ±2.5V from a single 5V supply to bias precision op-amps in portable data loggers. IC Role / Device Role / Timing Role: LMC7660IMX acts as a compact, low-noise negative rail generator with minimal external components. Use Value: Enables true bipolar operation without bulky inductors or transformers, preserving board space and battery runtime. |
Use Scenario: Providing −5V bias for analog front-end circuits in handheld gas sensors powered by two AA cells. IC Role / Device Role / Timing Role: LMC7660IMX serves as the sole negative supply source, synchronized to system sleep cycles via OSC pin control. Use Value: Achieves 200 μA max quiescent current, extending battery life beyond 3 years in intermittent-read applications. |
| μPower Thermometer Front-End | Low-Cost Dual-Rail Power for Audio DACs |
|
Use Scenario: Supplying −5.5V to LM35-based thermometer circuits measuring −55°C to +125°C using two 1.5V alkaline cells. IC Role / Device Role / Timing Role: LMC7660IMX functions as the core voltage inverter, paired with Schottky diodes for low-voltage efficiency. Use Value: Delivers stable negative rail at <150 μA total system current, enabling full-range temperature measurement without external regulators. |
Use Scenario: Creating ±3.3V rails from a single 3.3V input for audio DACs in compact Bluetooth speakers. IC Role / Device Role / Timing Role: LMC7660IMX generates the negative rail while sharing Cr with parallel-stage configurations to lower output impedance. Use Value: Supports 10 mA load with <200 mV ripple using standard 10 μF electrolytics, eliminating need for expensive low-ESR ceramics. |
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 85 kHz oscillator frequency; 120 μA typical supply current; requires external diode for latchup immunity above 5.5V | Preferred for higher-output-current (>25 mA) or faster-transient applications; less suitable for ultra-low-IQ designs | Select MAX660CPA+ when higher switching frequency reduces capacitor size requirements and external diode integration is acceptable |
| ICL7660SIPAZ | Wider −40°C to +125°C temp range; 170 μA max supply current; pin-compatible but not identical LV pin behavior | Better suited for automotive under-hood or industrial high-temp environments where extended junction temperature is critical | Choose ICL7660SIPAZ when operating ambient exceeds +85°C or when tighter supply current tolerance is required over full temperature range |
Compared with LMC7660IMX, MAX660CPA+ trades higher frequency and current efficiency for added external component complexity, while ICL7660SIPAZ extends temperature capability at marginally lower quiescent current-but neither offers the same combination of diode-free operation, −40°C to +85°C qualification, and 200 μA max IQ in SOIC-8 at comparable cost.
Availability
LMC7660IMX is available at Aetrix Electronics and suitable for portable instrumentation, battery-backed memory systems, and rail-splitting applications requiring stable component supply with long-term manufacturability assurance.
Supply support for LMC7660IMX 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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and interface ICs.
The LMC7660IMX belongs to TI's legacy precision analog portfolio, designed specifically for low-power, space-constrained DC/DC voltage inversion where simplicity, reliability, and diode-free operation are essential.
FAQ
What is the maximum supply voltage rating for the LMC7660IMX?
The LMC7660IMX has an absolute maximum supply voltage rating of 10.5V. Its operational supply range is +1.5V to +10V, with guaranteed performance including ≥97% voltage conversion efficiency and 200 μA max supply current across this full range. Exceeding 10.5V risks permanent damage per the Absolute Maximum Ratings table in the official SNOSBZ9C datasheet.
Can the LMC7660IMX operate without external diodes?
Yes, the LMC7660IMX is explicitly designed to operate without external diodes across its full −40°C to +85°C temperature range and +1.5V to +10V supply voltage range. This eliminates forward voltage drop and series resistance associated with external diodes, preserving output voltage accuracy and power efficiency-unlike earlier 7660 variants that required diodes to prevent latchup.
How does the LV pin function on the LMC7660IMX?
The LV pin (Pin 5) on the LMC7660IMX optimizes low-voltage operation: it must be shorted to GND when V+ ≤3.5V to improve startup and regulation, and left open for V+ >3.5V to prevent internal damage. This pin controls internal biasing of the oscillator and level translator, directly affecting efficiency and stability at sub-3.5V inputs.
What is the recommended capacitor configuration for the LMC7660IMX?
The LMC7660IMX requires two external electrolytic capacitors: Cp (pump capacitor, typically 10–100 μF) connected between Pins 2 and 4, and Cr (reservoir capacitor, typically 10–100 μF) connected between Pins 3 and 8. Polarities must match datasheet Figure 1: Cp anode to Pin 4 (V+), Cr cathode to Pin 8 (VOUT). Larger values reduce ripple but increase start-up time.
Is the LMC7660IMX pin-compatible with the original 7660?
Yes, the LMC7660IMX is a pin-for-pin replacement for the industry-standard ICL7660 and other legacy 7660 variants. All eight pins map identically in SOIC-8 package, enabling direct substitution in existing layouts. However, unlike older versions, the LMC7660IMX eliminates the need for an external output diode and adds LV pin functionality for enhanced low-voltage operation.
LMC7660IMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LMC7660IMX FAQ
1.How can I place an order for LMC7660IMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC7660IMX 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 reliable?
The price and inventory of LMC7660IMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC7660IMX is usually 5 days.
3.What payment methods are accepted for LMC7660IMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC7660IMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC7660IMX?
LMC7660IMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC7660IMX 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?
For technical support, including LMC7660IMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC7660IMX requirements.
6.How does Aetrix verify that LMC7660IMX is sourced from the original manufacturer or authorized distributors?
All LMC7660IMX 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 meets industry standards.
7.What is the process for return or replacement of LMC7660IMX?
All LMC7660IMX units undergo pre-shipment inspection (PSI). If there is an issue with LMC7660IMX, 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 part is unused and in its original packaging.
Return procedure for LMC7660IMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMC7660IMX 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…
