L6911E

The L6911E is a high-performance, PFM-controlled switch-mode synchronous converter designed to control the output voltage of DC/DC circuits. The synchronous rectified output voltage is adjustable in terms of input voltage and temperature. It is used to provide cost-effective operation in a variety of low-voltage DC/DC converter topologies, including boost and buck-boost.

The L6911E has a wide operating range with output voltage adjustable over the entire 2.0V to 5.5V range and input supply at 1.7V to 5.5V. It also features a low-power start-up, programmable single power-on/power-off delay, programmable current limit, undervoltage lock-out, and thermal shutdown. Additionally, it integrates the Active Harmonic Cancellation (AHC) circuit that reduces the switching ripple and noise.

The L6911E provides an integrated charge pump for low output current mode and an external capacitor for high output current mode. The output voltage for the low output current mode is adjusted by programming the charge pump voltage, or the number of “clocks” applied, while the capacitance of the external capacitor is used to adjust the output voltage in the high output current mode.

The L6911E is ideal for use in a variety of DC/DC power conversion applications, such as portable and industrial systems, embedded controllers, and digital signal processors. It is suitable for use in automotive and industrial applications that require both high power efficiency and no added EMI noise.

The L6911E is a switched-mode synchronous converter that uses PWM control to regulate the output voltage. It consists of an active-low control input, an enable input for soft start control, and a high-impedance feedback input. It also includes a low-power start-up, programmable current limit, undervoltage lock-out, and thermal shutdown. The output voltage can be adjusted by programming the charge pump voltage, or the number of “clocks” applied, and by adjusting the external capacitor.

At the heart of the L6911E is the synchronous rectifier. The synchronous rectifier drives the output switch and the synchronous rectifier’s output is the output voltage. The rectifier is controlled by the PWM, and the PWM controls the output voltage by varying the duty cycle. The L6911E has a built-in AHC circuit that reduces EMI noise and helps to meet regulatory requirements. The output voltage is further regulated by the current limit circuit, which also provides protection from over current. The undervoltage lock-out prevents the converter from trying to start up with an input voltage lower than the lockout voltage.

The L6911E is a highly versatile regulator, providing the flexibility to design a power converter suitable for a wide range of DC/DC applications. Its wide operating range and built-in features make the L6911E an ideal choice for cost-effective, low-power DC/DC switching converters.