LTC3776EGN#PBF

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PMIC (Power Management Integrated Circuit) includes various kinds of voltage regulators. Special purpose voltage regulators, such as LTC3776EGN#PBF, provide design flexibility and superior performance for various applications. In this article, its application field and working principle will be introduced.

One of the application fields for LTC3776EGN#PBF is current mode synchronous buck LED driver LED backlight system. LEDs in LED backlight system usually offer small current, high driving voltage and wide dimming range. The LTC3776EGN#PBF meets the needs by powering multiple strings of LEDs with excellent efficiency up to 92%. It can also efficiently control the current provided to LEDs for an extended dimming range.

The second application is switched capacitor DC/DC converters with 4-output step-down converter. This type of converters has very low quiescent current (0.7μA), low component count, and a high-efficiency, low-input voltage architecture which is able to generate various output voltages. With LTC3776EGN#PBF, the converter can be used to generate 4 independent output voltages with high efficiency, low noise and low power consumption.

LTC3776EGN#PBF operates in current mode, which is a popular way of implementing control loops in SMPS (Switch Mode Power Supplies). In this architecture the current feedback is sensed from the power switches at the output of the switching power supply and it’s fed back to the controller which modulates the power switch’s duty cycle by controlling the pulse width and hence the average output power of the supply.

LTC3776EGN#PBF is designed with RAMP comparator, a reduced bandwidth control loop employed to minimize the output voltage, ripple, and current overshoots under dynamic loads. RAMP comparator can maintain a great control over the output voltage and minimize the ringing on both the rising and falling edges of the signal.

LTC3776EGN#PBF has impedance matching network to minimize the effects of transients, adaptive on-time control to prevent negative inductor current, line under-voltage lockout (UVLO) as a safety measure when the input voltage falls below minimum, and so on.

Finally, LTC3776EGN#PBF has lower output and input voltage ripple, a wide input voltage range, and a continuous output current up to 1.5A.

LTC3776EGN#PBF is a powerful, yet flexible special purpose voltage regulator. With the features described in this article, its application field and operating principle can be better understood. This product can be used for LED backlight system as well as 4-output step-down converter.

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