LMC7660IN

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LMC7660IN Application Field and Working Principle

The LMC7660IN is a DC-DC switching regulator from the family of PMIC - Voltage Regulators - DC DC Switching Regulators. It is a general-purpose linear step down regulator fabricated in advanced CMOS technology for high accuracy and low power dissipation. Specifically, it offers excellent circuit area utilization, high power efficiency and low output current ripple.

The LMC7660IN is able to deliver output currents up to 1.5A and operate input voltages up to 25V. The output voltage is adjustable up to 10V and can be trimmed between 4.25V and 8V. It has an on-chip reference voltage of 1.2V, which ensures high output accuracy. The device also features a low-power shutdown mode and very low stand-by current (up to 30 µA).

The LMC7660IN has been designed for applications such as medical equipment, test instrumentation, computer peripherals, RF and power amplifiers, power converters and power supplies. It is suitable for battery charging, pro- audio and other high-end applications.

Operating Principle

The LMC7660IN is an integrated circuit designed to step down DC input voltage to a lower, adjustable output voltage. The core element of the circuit is a voltage regulator, which uses a control circuit to regulate the output voltage by comparing the output voltage to an internal reference voltage. This approach eliminates the need for expensive, high-precision resistors, capacitors or inductors.

When the input voltage is greater than the output voltage, the control circuit initiates a “switching” operation that turns on the power switches and transfers energy to the output. As the output voltage rises, a comparator creates an “error” signal that is fedack to the control circuit. The circuit then reduces the duty cycle of the power switches to bring the output voltage back down to its set point without the need for expensive, high-precision resistors, capacitors or inductors.

When the output voltage is greater than the desired set point, the duty cycle is increased, to reduce the output voltage. The LMC7660IN is designed to provide a very accurate output voltage, making it an ideal choice for applications that require precise voltage regulation. In addition, the device can be disabled by a logic input, to further reduce power consumption.

Protection Features

The LMC7660IN offers several protection features, designed to protect the device from damage due to short circuit, over temperature and over voltage. The protection circuitry monitors the voltage between the output and ground to detect a short circuit. Additionally, the device features an over-temperature shut-down circuit and an over-voltage protection circuit. Additionally, the device incorporates a power-saving sleep mode, which can be enabled by a logic input.

Package Options and Pinout

The LMC7660IN is available in a variety of package options, including a 5-lead SOT-23, 8-lead SOIC, 8-lead MSOP, 8-lead IP, 8-lead TSSOP, 8-lead SSOP and 8-lead VSSOP. The pinout for the SOT-23, SOIC and VSSOP packages is shown in Figure 1.

Figure 1: Pinout of the LMC7660IN

The LMC7660IN is a versatile integrated circuit with a wide range of applications. It is inexpensive, highly accurate and offers excellent power efficiency. Additionally, the device provides robust protection features to protect against short circuits, over temperature and over voltage conditions.

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