Part Number: LM2664M6X/NOPB

Manufacturer: Texas Instruments


Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of LM2664M6X/NOPB

Datasheet  LM2664M6X/NOPB datasheet
Category Integrated Circuits (ICs)
Family PMIC – Voltage Regulators – DC DC Switching Regulators
Manufacturer Texas Instruments
Packaging Cut Tape (CT)
Part Status Active
Function Ratiometric
Output Configuration Positive or Negative
Topology Charge Pump
Output Type Fixed
Number of Outputs 1
Voltage – Input (Min) 1.8V
Voltage – Input (Max) 5.5V
Voltage – Output (Min/Fixed) -Vin, 2Vin
Voltage – Output (Max)
Current – Output 40mA
Frequency – Switching 80kHz
Synchronous Rectifier No
Operating Temperature -40°C ~ 85°C (TJ)
Mounting Type Surface Mount
Package / Case SOT-23-6
Supplier Device Package SOT-23-6

LM2664M6X/NOPB Description

The CMOS voltage converter known as the LM2664 is capable of converting a positive voltage that falls within the range of 1.8 V to 5.5 V to the corresponding negative voltage that falls within the range of -1.8 V to -5.5 V. To deliver a maximum output current of 40 mA, the gadget makes use of two capacitors that are quite inexpensive. The output resistance and voltage ripple are reduced to a minimum by the LM2664, which operates at an oscillator frequency of 160 kHz. Its working current is just 220 A, which ensures exceptional performance for battery-operated systems with an operating efficiency of over 91% under normal loads. In addition, the normal current draw during shutdown is only 1 A, making the LM2664 a great choice for battery-powered applications.

LM2664M6X/NOPB Features

  • Inverts Input Supply Voltage
  • 6-Pin SOT-23 Package
  • 12-Ω Typical Output Impedance
  • 91% Typical Conversion Efficiency at 40 mA
  • 1-µA Typical Shutdown Current

LM2664M6X/NOPB Applications

  • Cellular Phones
  • Pagers
  • PDAs
  • Operational Amplifier Power Suppliers

LM2664M6X/NOPB Detailed Description

The LM2664 is a CMOS charge-pump-based voltage converter that can convert positive voltage in the range of 1.8 V to 5.5 V to its negative equivalent of -1.8 V to -5.5 V. To provide an output current of up to 40 mA; the LM2664 makes use of a pair of capacitors that are quite inexpensive.

LM2664M6X/NOPB Device Functional Modes

  • Shutdown Mode

The LM2664 has a shutdown (SD) pin that can be used to deactivate the device and bring the quiescent current down to 1 A. Applying a voltage to the SD pin lower than 20% of V+ will cause the device to enter the shutdown mode. “ecosystem” refers to a group working in the construction industry.

Application Information

Using a CMOS charge-pump, the LM2664 voltage converter converts a positive voltage between 1.8 V and 5.5 V to a negative voltage between -1.8 V and -5.5 V. With just two inexpensive capacitors, and the gadget can generate an output current of up to 40 mA. To lower the output resistance and the voltage ripple, the LM2664 uses an oscillator frequency of 160 kHz. The voltage converter is ideal for battery-powered systems since it has a normal shutdown current of 1 A and an operating current of only 220 A, corresponding to an operational efficiency of more than 91% with most loads.

Detailed Design Requirements.

The voltage inverter circuit used by the LM2664, primarily used to generate negative supply voltage, requires only 2 external capacitors, as shown in the Voltage Inverter and 5 V to 10 V Converter. The output characteristics can be modeled for illustrative purposes by imagining a perfect voltage source in series with a resistance. Power can be supplied between 1.8 V and 5.5 V. The symbol (V+) stands for the power supply.

The output resistance ROUT is dependent on the oscillator frequency, the capacitance, and the ON resistance of the internal MOSFET switches, all of which can be affected by the equivalent series resistance (ESR) of the pumping capacitor C1, which will be magnified by a factor of four in the output resistance due to the switching current charging and discharging C1 being roughly twice as large as the output current. Yet the output capacitor C2 charges and discharges at almost the same rate as the output current; thus, its equivalent series resistance (ESR) is only counted once in the output resistance.

Paralleling Devices

The output resistance can be lowered by connecting multiple LM2664s in parallel. Pumping capacitors C1 are required for each individual device, but just one output capacitor, COUT, is required.

Power Supply Recommendations

When the LV pin is grounded, the LM2664 can function as an inverter from an input voltage supply of 1.8 V to 5.5 V. The input power source must be stable and deliver the specified input current. Further to the ceramic bypass capacitors, bulk capacitance may be needed if the input supply is far from the LM2664.


● Layout Guidelines

The LM2664’s high switching frequency and significant switching currents make layout consideration crucial. Follow these guidelines to ensure your gadget stays steady and properly regulates the LED current over its entire voltage and current operating range.

You should put CIN on the top layer, next to the LM2664. With the input capacitor connected to the V+ and GND pins via short, wide lines, inductive voltage spikes caused by switching are mitigated, protecting the V+ line from potential damage.

Position COUT as close as possible to the LM2664’s OUT and GND pins on the top layer. The GND pin should be as close as feasible to where the CIN and COUT returns meet. The series inductance on the OUT and GND pins, which can degrade the VOUT and GND lines and generate excessive noise in the device and surrounding circuitry, is minimized by connecting COUT through short, wide traces.

The capacitor C1 should be located as close to the LM2664 as possible on the top layer. Short, wide traces should be used to connect the flying capacitor to the CAP+ and CAP- terminals.


The LM2664M6X/NOPB is a powerful and flexible CMOS charge-pump voltage converter. By employing just two inexpensive capacitors, it can invert a positive voltage between 1.8 V and 5.5 V to a negative voltage between 1.8 V and 5.5 V, with an output current of up to 40 mA. The LM2664 is ideal for battery-powered devices, including mobile phones, pagers, personal digital assistants, and operational amplifier power supplies due to its low working current of 220 A and normal shutdown current of 1 A. The device has particular layout recommendations for steady and proper LED current management, and it can be paralleled to lower output resistance. In a nutshell, the LM2664M6X/NOPB is an efficient and trustworthy voltage converter suitable for a wide range of battery-operated devices.

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