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PM8903 Datasheet(PDF) 1 Page - STMicroelectronics |
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PM8903 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 34 page  February 2012 Doc ID 022748 Rev 1 1/34 34 PM8903 3 A step-down monolithic switching regulator Features ■ Integrated 35 m Ω MOSFETs for high efficiency ■ 3 A continuous output current ■ 2.8 V to 6 V input voltage (VIN) ■ 2.9 V to 5.5 V supply voltage (VCC) ■ Adjustable output voltage down to 0.6 V ■ 1% output voltage accuracy ■ 1.1 MHz switching frequency operation ■ PSKIP mode to optimize light load efficiency ■ Embedded bootstrap diode ■ Thermally compensated loss-less current sense across HS and LS MOSFETs ■ OV/UV/OC and overtemperature protection ■ Internal soft-start and soft-stop ■ Interleaving synchronization (Up to 2 ICs) ■ Power Good output ■ Shutdown function (<15 μA quiescent current) ■ VFQFPN16 3 x 3 mm compact package Applications ■ Subsystem power supply ■ CPU, DSP and FPGA power supply ■ Distributed power supply ■ General DC-DC converters Description The PM8903 is a high efficiency monolithic step- down switching regulator designed to deliver up to 3 A continuous current. The IC operates from 2.8 V to 6 V input voltage (VIN). The PM8903 features low-resistance integrated nMOS and proprietary pulse-skipping mode for optimum efficiency over all the loading range. The voltage mode control loop allows the widest range of output filter. Current sense is internally thermally compensated for optimum precision. The integrated 0.6 V reference allows the regulation of output voltages with ±1% accuracy over temperature variations. Switching frequency is typically set to 1.1 MHz and can be programmed to 0.8 MHz or 1.0 MHz. Out of phase synchronization allows the reduction of input RMS current. The PM8903 provides precise dual-threshold overcurrent protection as well as over / undervoltage and overtemperature protection. PGOOD output easily provides real-time information on the output voltage. The PM8903 is available in VFQFPN16 3 x 3 mm. VFQFPN16 3x3 mm Table 1. Device summary Order codes Package Packing PM8903 VFQFPN16 3x3 mm Tube PM8903TR VFQFPN16 3x3 mm Tape and reel www.st.com |
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