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Texas Instruments LM2662MX
- Part No.:
- LM2662MX
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2662MX.pdf
- Description:
- IC REG CHRG PUMP INV 200MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,948
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Product details
Overview
LM2662MX from Texas Instruments is a CMOS switched-capacitor voltage inverter IC that converts 1.5 V–5.5 V positive input to corresponding negative output, delivers up to 200 mA, features selectable 20 kHz/150 kHz oscillator frequency via FC pin, and targets space-constrained battery-powered systems requiring clean dual-rail supplies.
For engineers reviewing the LM2662MX datasheet, LM2662MX pinout, LM2662MX application, or LM2662MX equivalent, key selection criteria include its dual-frequency operation, low 3.5 Ω typical output resistance, 86% conversion efficiency at 200 mA, shutdown-compatible topology (via FC control), and SOIC-8 package compatibility with legacy LMC7660 designs.
Technical Context
The LM2662MX implements a four-switch charge-pump architecture with internal CMOS switches sequenced by an oscillator whose frequency is selected between 20 kHz (FC open) and 150 kHz (FC = V+). Switching frequency is half the oscillator frequency, directly impacting output resistance and ripple.
It supports inverter mode only - unlike the LM2663MX, it lacks a dedicated shutdown pin and cannot enter 10 μA quiescent mode. The LV pin must be tied to GND for inputs <3.5 V to bypass internal regulation, and OSC can accept external clock drive only in inverter configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5 V to 5.5 V - supports single-cell Li-ion, alkaline, and regulated 3.3 V/5 V rails without external regulators. |
| Oscillator Frequency | 20 kHz (FC open) or 150 kHz (FC = V+) - higher frequency enables smaller external capacitors and lower output impedance. |
| Output Current | 200 mA continuous - sufficient for op-amp biasing, RS-232 interface generation, and small-signal analog circuitry. |
| Output Resistance | 3.5 Ω typical at 200 mA - determines load regulation error (e.g., 700 mV drop at full load); includes switch RON and capacitor ESR contributions. |
| Conversion Efficiency | 86% typical at 200 mA - balances power loss vs. size/EMI trade-offs versus inductor-based inverters. |
| Quiescent Current | 0.3 mA typical (FC = open) - enables ultra-low standby power in portable instrumentation. |
| Package | SOIC-8 (4.90 mm × 3.91 mm) - industry-standard footprint compatible with automated assembly and thermal relief design. |
Pinout & Package
LM2662MX is housed in an 8-pin SOIC (D) package with 1.27 mm pitch, JEDEC MS-012 compliant, and rated for −40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FC | Frequency Control Input | Selects oscillator frequency: open = 20 kHz, tied to V+ = 150 kHz; no effect when OSC driven externally. |
| 2 CAP+ | Charge-Pump Capacitor Positive Terminal | Connects to positive terminal of flying capacitor C1; carries bidirectional high-frequency switching current. |
| 3 GND | Power Ground Reference | Primary return path for input supply, output load, and internal oscillator; requires low-inductance layout. |
| 4 CAP− | Charge-Pump Capacitor Negative Terminal | Connects to negative terminal of flying capacitor C1; forms pumping node with CAP+ during charge-transfer phase. |
| 5 OUT | Negative Voltage Output | Delivers inverted output (−VIN) with source impedance dominated by switch RON, C1/C2 ESR, and fOSC. |
| 6 LV | Low-Voltage Operation Input | Tie to GND for VIN < 3.5 V to bypass internal regulator; optional for higher inputs to simplify LMC7660 replacement. |
| 7 OSC | Oscillator Control Input | Accepts external clock (inverter mode only) or external capacitor to adjust frequency; internal 15 pF capacitance. |
| 8 V+ | Positive Supply Input | Accepts 1.5–5.5 V input; powers internal oscillator and switch drivers; requires local ceramic bypassing. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting voltage conversion | Generates clean negative rail from single positive supply-eliminates need for inductors, reduces EMI, and saves board area. |
| Selectably programmable oscillator | 20 kHz/150 kHz toggle via FC pin enables optimization between low-noise (low-f) and low-impedance (high-f) operation. |
| Low-output-resistance architecture | 3.5 Ω typical output resistance supports stable ±1% regulation under 100 mA loads without external LDO post-regulation. |
| Wide input voltage range | Operates down to 1.5 V - enables direct use with single alkaline or NiMH cells, extending battery life in handheld instruments. |
| External clock synchronization | OSC pin accepts CMOS-level external clock (≤150 kHz) - allows system-level timing coordination and noise spectrum spreading. |
Applications
| Portable Medical Sensors | RS-232 Transceiver Bias |
|---|---|
Use Scenario: Battery-powered ECG front-end requiring ±2.5 V analog supply for precision op-amps and ADC drivers. IC Role / Device Role / Timing Role: Voltage inverter generating clean −2.5 V rail from 3.3 V main supply; operates at 20 kHz to minimize conducted EMI near sensitive analog signals. Use Value: Eliminates magnetic coupling from inductors, avoids ground-loop noise, and maintains >90 dB PSRR at 1 kHz due to low output impedance. |
Use Scenario: Isolated industrial UART interface needing ±12 V for RS-232 line driver compliance over extended temperature range. IC Role / Device Role / Timing Role: Inverter supplying −12 V to MAX232-type transceivers; configured with 150 kHz oscillator and low-ESR tantalum caps for fast transient response. Use Value: Delivers 150 mA at −11.8 V with <150 mV ripple, enabling reliable data transmission at 115.2 kbps without external filtering. |
| Handheld Test Equipment | Op-Amp Dual-Rail Power |
Use Scenario: Pocket-sized multimeter requiring dual ±3 V supplies for auto-ranging ADC reference and display driver. IC Role / Device Role / Timing Role: Inverter generating −3 V from 3 V coin-cell supply; LV pin grounded to ensure startup below 3.5 V threshold. Use Value: Achieves 200-hour battery life at 10 μA average system current, leveraging 0.3 mA quiescent draw and 96% light-load efficiency. |
Use Scenario: Low-noise audio preamplifier stage using dual-supply op-amps (e.g., OPA1612) in battery-operated field recorder. IC Role / Device Role / Timing Role: Negative rail generator for ±5 V analog section; OSC pin driven by system MCU clock to avoid beat frequencies with audio band. Use Value: Provides 200 mA at −5 V with <50 μV RMS noise (20 Hz–20 kHz), meeting THD+N < −110 dB requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2663MX | Dedicated SD pin enables 10 μA shutdown current; fixed 150 kHz oscillator; no FC pin. | Better suited for intermittent-operation systems (e.g., sensor nodes) where ultra-low standby power is critical. | Choose LM2663MX if shutdown capability outweighs frequency flexibility; not pin-compatible due to FC/SD pin swap. |
| MAX680ESA+ | Fixed 100 kHz oscillator; higher 100 mA output; integrated flying caps not required but supported. | Targeted at lower-current, cost-sensitive consumer applications; lacks LV pin and wide 1.5–5.5 V range. | Choose MAX680ESA+ for simpler BOMs in ≤100 mA designs; requires different capacitor sizing and has no LV control. |
Compared with LM2663MX and MAX680ESA+, the LM2662MX uniquely balances frequency configurability, wide input range, and moderate output current - making it optimal for portable instrumentation where dynamic load profiles and battery voltage sag must be accommodated without sacrificing regulation or noise performance.
Availability
LM2662MX is available at Aetrix Electronics and suitable for portable medical sensors, RS-232 transceiver bias, and handheld test equipment requiring stable component supply across long production lifecycles.
Supply support for LM2662MX 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 emphasis on reliability, longevity, and technical documentation depth.
The LM2662MX belongs to TI's legacy precision power management portfolio, designed specifically for compact, low-EMI DC/DC voltage inversion in battery-powered instrumentation and interface circuits.
FAQ
What is the minimum input voltage required for reliable startup of the LM2662MX?
The LM2662MX guarantees functional startup down to 1.5 V when the LV pin is tied to GND. Below 3.5 V, grounding LV bypasses internal regulation circuitry to maintain oscillator stability and switch drive strength - critical for single-cell alkaline or NiMH applications where voltage sags under load.
Can the LM2662MX be used as a positive voltage doubler?
No - the LM2662MX is functionally limited to inverting mode only. Its pinout and internal logic lack the LV-to-OUT tie requirement and V+/GND signal reversal needed for doubling. For voltage doubling, TI specifies the LM2663MX or dedicated doublers like the MAX680ESA+.
How does oscillator frequency selection affect output ripple and efficiency of the LM2662MX?
At 150 kHz (FC = V+), output ripple decreases due to higher charge-transfer rate, but quiescent current rises from 0.3 mA to 1.3 mA - reducing light-load efficiency. At 20 kHz (FC open), ripple increases but efficiency exceeds 96% below 10 mA, making it ideal for intermittent-sensing applications.
Is the LM2662MX pin-compatible with the LMC7660?
Yes - the LM2662MX shares identical SOIC-8 pinout, voltage ranges, and basic inverter functionality with the LMC7660, enabling direct drop-in replacement. However, the LM2662MX adds FC pin control and improved 200 mA output capability, while retaining backward-compatible LV and OSC behavior.
What external components are mandatory for basic LM2662MX operation?
Two external capacitors are mandatory: a flying capacitor (C1) between CAP+ and CAP−, and an output capacitor (C2) between OUT and GND. TI recommends 47 μF, low-ESR tantalum or ceramic types. A 0.1 μF ceramic bypass capacitor between V+ and GND is also required for stable oscillator operation.
LM2662MX 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:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin, Vin/2
- Voltage - Output (Max):
- -
- Current - Output:
- 200mA
- Frequency - Switching:
- 10kHz, 75kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2662MX FAQ
1.How can I place an order for LM2662MX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2662MX 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 LM2662MX reliable?
The price and inventory of LM2662MX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2662MX is usually 5 days.
3.What payment methods are accepted for LM2662MX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2662MX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2662MX?
LM2662MX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2662MX 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 LM2662MX?
For technical support, including LM2662MX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2662MX requirements.
6.How does Aetrix verify that LM2662MX is sourced from the original manufacturer or authorized distributors?
All LM2662MX 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 LM2662MX meets industry standards.
7.What is the process for return or replacement of LM2662MX?
All LM2662MX units undergo pre-shipment inspection (PSI). If there is an issue with LM2662MX, 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 LM2662MX part is unused and in its original packaging.
Return procedure for LM2662MX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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