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L4957V1.5 Datasheet(PDF) 1 Page - STMicroelectronics |
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L4957V1.5 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 7 page  L4957 UP TO 4A ULDO LINEAR REGULATOR 1.5V AND 2.5V FIXED OUTPUT VOLTAGE 3V TO 6.5V INPUT VOLTAGE RANGE 200m Ω Rdson TYPICAL @ Tj = 125°C 0.6V max. DROP-OUT AT 2A EXCELLENT LOAD REGULATION 0.6mA QUIESCENT CURRENT AT ANY LOAD SHORT CIRCUIT PROTECTION WITH FOLD- BACK THERMAL SHUTDOWN APPLICATIONS MOTHER BOARDS PROCESSOR I/O & SUPPLIES LOW VOLTAGE MEMORY & CHIP SET SUP- PLIES GRAPHIC & SOUND CARDS LOW VOLTAGE LOGIC SUPPLIES POST REGULATOR FOR SMPS DESCRIPTION The L4957 devices are Ultra Low Drop Output lin- ear regulators with an internal N-channel MOS of 200m Ω particulary suitable for low voltage/low dropout applications. Operating with a input voltage from 3V to 6.5V they are capable to deliver up to 4A at 1.5V or 2.5V fixed output voltages. The devices are ideal for use as one of the sup- plies required by processor, for example they are the cost effective and efficient solution for conver- sion from 3.3V (rail bus) to 2.5V @ 2.5A or to 1.5V with high current rating. Fast response transient minimise the output ca- pacitor 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 con- trolled short circuit current. Thermal shutdown provides protection against overload conditions that creates excessive junction temperature. February 2000 ® L4957 GND OUT IN 3 2 1 C1 3V to 6.5V C2 VOUT=1.5V/2.5V D97IN657E TYPICAL APPLICATION ORDERING NUMBERS: L4957V1.5 L4957D1.5 L4957V2.5 L4957D2.5 MULTIPOWER BCD TECHNOLOGY 1 3 D 2PAK Versawatt TO-220 1/7 |
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