LTC3405AES6-1.375#TRMPBF

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The LTC3405AES6-1.375#TRMPBF (hereinafter referred to as "LTC3405AES6") is a DC/DC switching regulator integrated circuit of PMIC (Power Management IC). It is a small, low noise, high performance voltage regulator. The 9-pin SOT-23 package of the LTC3405AES6 allows for efficient internal layout and minimal external counts.

Application Field

The LTC3405AES6 is especially suitable for high efficiency step-up voltage converters and other switching power applications. It includes adjustable soft-start and foldback current limiting, multi-mode pulse frequency modulation operation, and Automatic PWM/PFM mode scanning for ultra low ripple operation with light load. It is suitable for powering applications such as hand held communication equipment, portable instruments, PDAs and other mobile electronics.

The LTC3405AES6 also supports a wide input voltage range from 2.6V to 21V, and its adjustable output voltage can range up to 21V. Furthermore, its low profile SOT-23-9 packages can create a realistic space-constrained design, while LTC DE-Series boards are a complete solution for any development needs. Moreover, this device incorporates series protection and surge protection that makes it great for powering audible alarms to protect applications.

Working Principle

In DC/DC switching regulator circuits, the output voltage is regulated by turning on and off the switching device at a given frequency in order to maintain the output voltage at a certain level. The switch on time and off time are controlled by a pulse-width modulation circuit. This type of regulation is known as "pulse-width modulation" (PWM). The LTC3405AES6 utilizes PWM regulation to maintain voltage set points.

In the LTC3405AES6 the output voltage is called the reference voltage, and is set by resistors connected to the FB pin. The switch on/off times are adjusted by the PWM controller in response to the reference voltage. When the input voltage is above the reference voltage, the switch is switched off, otherwise the switch is switched on. This results in the output voltage being maintained at a constant level, regardless of the input voltage.

The LTC3405AES6 also implements an automatic PWM/PFM mode feature, which enables the regulator to switch between PWM and PFM modes based on the output current. When the output current is small, the device is in PFM mode and when the load is high, it switches to PWM mode by utilizing an internal comparator and frequency control loop.

The LTC3405AES6 also has built-in protection features such as foldback current protection and adjustable soft-start capability which can prevent damage from in-rush current when the extra current is required during the start. The device has over temperature protection and short circuit protection to ensure that the circuit can handle overload and over temperature conditions.

The LTC3405AES6 is a versatile, efficient, and reliable DC/DC switching regulator integrated circuit that is ideal for most high power and space-constrained applications. Its wide range of features make it perfect for powering mobile devices, PDAs, and other hand held communication equipment.

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