LM3445MM/NOPB

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The LM3445MM/NOPB is a highly efficient white LED driver designed for portable applications. This product is a member of the Texas Instruments Power Management family of low power devices and is designed to enable high-brightness LED applications with very low quiescent current and low output ripple. The LM3445MM/NOPB is a current-mode synchronous buck-boost converter that offers an adjustable output current of up to 15 mA. It can operate in either Buck or Buck-Boost operation depending on the output voltage.

The LM3445MM/NOPB can operate over an input voltage range of 2.7 - 5.5 V and the output current is adjustable from 0 mA to 15 mA. It is capable of providing up to 90% efficiency for a wide range of input voltage and load conditions. The unit can source up to 65 mA of output current and the output voltage is adjustable from 0 V to 5 V. The part also features a wide variety of protection features, including thermal shutdown and undervoltage lockout.

The LM3445MM/NOPB is primarily meant for controlling higher power white LED strings composed of 3 to 8 LEDs in portable or battery powered applications. It is capable of driving a string of LEDs with a typical forward voltage of 4.2V and a single LED with a typical forward voltage of 3V. The maximum LED string current is determined by the internal current setting resistors.

The LM3445MM/NOPB utilizes a synchronous buck-boost converter topology to step up or step down input supply voltage to the level required to power the desired LED strings or a single LED. It is a current-mode, voltage-regulated switching regulator that operates by sensing the current in the inductor and comparing it to the current-set reference. The current-set reference is set by an external resistor that is connected to the current set pin (CS). The device can be configured in either buck or buck-boost operation, depending on the desired output voltage.

When operating in buck mode, the LED string current is determined by the internal current setting resistors and is regulated independently of the input voltage. In buck-boost mode, the output current set point is determined by the internal current setting resistors and the input voltage. The flexible design of the LM3445MM/NOPB enables it to drive either single LEDs or multiple LED strings with low output ripple and high efficiency.

A range of other features are included to make the LM3445MM/NOPB an ideal solution for portable devices powered by a single cell Li-Ion battery or two-cell AA batteries. It features programmable soft-start, which reduces the inrush current during startup, as well as a variety of protection features including thermal shutdown and under-voltage lockout.

In summary, the LM3445MM/NOPB is an efficient white LED driver designed for portable applications. It uses a current-mode synchronous buck-boost converter to provide an adjustable output current up to 15mA with high efficiency operation over a wide range of input and output voltages. The LM3445MM/NOPB is well suited for LED applications with a single LED or multiple LED strings, making it an ideal LED driver for portable electronic devices.

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