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PM6644 Datasheet(PDF) 1 Page - STMicroelectronics |
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PM6644 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 35 page  This is information on a product in full production. June 2012 Doc ID 023203 Rev 1 1/35 35 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 Applications ■ Networking power supply ■ Portable applications ■ Microcontroller supply ■ Industrial supply Description The PM6644 is a 350 mA valley current limit step- down 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 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 set- up. DFN10 Table 1. Device summary Part number Package Packing PM6644 DFN10 Tube PM6644TR DFN10 Tape and reel www.st.com |
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