PM6644

PM6644 350 mA adjustable step-down regulator Datasheet − production data 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 switching regulator can be programmed to regulate a fixed value of 3.47 V or it can deliver an adjustable voltage, depending on the FB pin setup. DFN10 Applications ■ ■ ■ ■ Networking power supply Portable applications Microcontroller supply Industrial supply 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. The pulse skipping technique increases efficiency at very light load. The switching frequency can be adjusted from 200 kHz to 600 kHz through a simple resistor. The Table 1. Device summary Part number PM6644 PM6644TR Package DFN10 DFN10 Packing Tube Tape and reel June 2012 This is information on a product in full production. Doc ID 023203 Rev 1 1/35 ww...