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L4957AD1.8 Datasheet(PDF) 1 Page - STMicroelectronics |
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L4957AD1.8 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 12 page  April 2006 Rev 6 1/12 12 L4957A Up to 5A ULDO linear regulator General features ■ 1.5V, 1.8V, 2.5V and 3.3V fixed output voltage ■ 3V to 14V input voltage range ■ 200m Ω RDS(on) typical @ tJ = 125°C ■ 0.6V max. drop-out at 2A ■ Excellent load regulation ■ 0.6mA quiescent current at any load ■ Short circuit protection ■ Thermal shutdown Applications ■ Mother boards ■ Processor I/O & supplies ■ Low voltage memory & chip set supplies ■ Graphic & sound cards ■ Low voltage logic supplies ■ Post regulator for SMPS Description The L4957AD devices are Ultra Low Drop Output linear regulators with an internal N-channel MOSFET of 200m Ω particulary suitable for low voltage/low dropout applications. Operating with a input voltage from 3V to 14V they are capable to deliver up to 5A. The devices are ideal for use as one of the suppliesrequired by processor, for example they are the cost effective and efficient solution for conversion from 3.3V (rail bus) to 2.5V @ 2.5A or to 1.5V with high current rating. Fast response transient minimise the output capacitor value. A minimum of 22 µF assures the stability in all load conditions. The on-chip trimming technique offers a tighter voltage reference tolerance (with ± 2% including line and load variation) beside to ensure a controlled short circuit current. Thermal shutdown provides protection against overload conditions that creates excessive junction temperature. D2PAK 1 3 www.st.com Order codes Part number Tube Tape and Reel L4957AD1.5 L4957AD1.5TR L4957AD1.8 L4957AD1.8TR L4957AD2.5 L4957AD2.5TR L4957AD3.3 L4957AD3.3TR |
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