LM3668QDNTRQ1

开关稳压器 1-A High-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter 12-WSON -40 to 125

The LM3668-Q1 is a synchronous buck-boost DC-DC converter optimized for automotive requirements and input voltage rails between 2.7 V and 5.5 V. It has the capability to support up to 1-A output current over the output voltage range. The LM3668-Q1 regulates the output voltage over the complete input voltage range by automatically switching between buck or boost modes depending on the input voltage.

The LM3668-Q1 has 2 N-channel MOSFETS and 2 P-channel MOSFETS arranged in a topology that provides continuous operation through the buck and boost operating modes. There is a MODE pin that allows the user to choose between an intelligent automatic PFM-PWM mode operation and forced PWM operation. During PWM mode, a fixed-frequency 2.2 MHz typical is used. PWM mode drives load up to 1 A. Hysteretic PFM mode extends the battery life through reduction of the quiescent current to 45 µA typical at light loads during system standby. Internal synchronous rectification provides high efficiency. In shutdown mode EN pin pulled low, the device turns off and reduces battery consumption to 0.01 µA typical.

A high switching frequency of 2.2 MHz typical allows the use of tiny surface-mount components including a 2.2-µH inductor, a 10-µF input capacitor, and a 22-µF output capacitor.