Description
The PM6644 is a 350 mA valley current limit stepdown regulator capable of delivering an adjustable output voltage in the range between 0.9 V and 8 V. A fixed value of output voltage is also available (3.47 V), saving the external resistor divider. It is housed in a small DFN10 3x3 package. The switching regulator is based on COT (constant-on-time) architecture, that assures fast load transient response; the embedded voltage feed-forward provides nearly constant switching frequency operation.

Features
■ 4.5 V to 25 V input voltage range
■ Output voltage VOUT: fixed 3.47 V or adjustable 0.9 V to 8 V
■ 350 mA valley current limit
■ Constant-on-time control
■ Programmable switching frequency
■ Pulse skipping mode (skip mode) at light loads
■ Independent EN signals
■ Latched OVP and UVP

Applications
■ Networking power supply
■ Portable applications
■ Microcontroller supply
■ Industrial supply