LTC1147IS8-3.3#TRPBF

LTC1147IS8-3.3#TRPBF Application Field and Working Principle

The LTC1147 is a precision-variable frequency, high-efficiency pulse-width modulation (PWM) controller from Linear Technology. It is a monolithic powerhouse that integrates current sensing, power control, protection, and housekeeping functions in a tiny, 8-pin package. It is well-suited for a wide variety of low-voltage DC/DC applications, including (but not limited to) notebook computer power supplies, DC/DC converters, and battery poweredhandheld devices.

The LTC1147IS8-3.3#TRPBF offers excellent performance and integration in a tiny package. It is ideal for applications requiring variable switching frequencies, quick startup times, and excellent thermal performance. The controller offers even better specifications at higher temperatures, making it a good choice for higher-temperature environments, including those found in automotive and telecom applications.

LTC1147IS8-3.3#TRPBF Features

• -4V to 15V input range
• External adjustable/fixed frequency range from 100 kHz to 800 kHz
• Very fast loop response times
• High efficiency up to 94%
• Undervoltage Lockout (UVLO)
• Four programmable protection features: Overvoltage Protection, Short-Circuit Protection, Thermal Shutdown, and Overcurrent Protection
• 20-pin low-cost package
• Programmable/fixed operating frequency range from 100 kHz to 800 kHz
• One-pin enable/disable control
• 100% duty cycle

Working Principle

The LTC1147IS8-3.3#TRPBF uses a high-density, high-efficiency, synchronous, fixed-frequency pulse-width modulation (PWM) control circuit to regulate the output voltage. PWM control involves maintaining a fixed signal frequency and varying the signal\'s duty cycle to precisely regulate the output voltage. By increasing or decreasing the duty cycle and/or frequency, the output voltage can be lowered or raised.

The LTC1147IS8-3.3#TRPBF offers several unique features to support its PWM control topology. It includes a TRUE pin-selectable fixed frequency to completely eliminate the need for external components and an internal error amplifier to sense and regulate the output voltage. Also included are an over-voltage shutdown, under-voltage lockout, over-current protection and thermal protection.

Applications

• Notebook computer power supplies
• DC/DC converters
• Battery-powered handheld devices
• Portable consumer electronics
• Automotive applications
• Telecom applications

In conclusion, the LTC1147IS8-3.3#TRPBF is a high-performance, low-cost controller for DC/DC applications. It provides excellent performance in efficient, low-frequency switching applications, with an adjustable frequency range from 100 kHz to 800 kHz. Its high efficiency and fast loop response time make it an ideal solution for a variety of applications, from notebook computers to handheld devices.