L4957AD1.8 STMicroelectronics

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 3 200m R typical t = 125C DS(on) J 1 0.6V max. drop-out at 2A 2 D PAK Excellent load regulation 0.6mA quiescent current at any load Description Short circuit protection The L4957AD devices are Ultra Low Drop Output Thermal shutdown linear regulators with an internal N-channel MOSFET of 200m particulary suitable for low Applications voltage/low dropout applications. Mother boards Operating with a input voltage from 3V to 14V they are capable to deliver up to 5A. Processor I/O & supplies Low voltage memory & chip set supplies The devices are ideal for use as one of the suppliesrequired by processor, for example they Graphic & sound cards are the cost effective and efficient solution for Low voltage logic supplies conversion from 3.3V (rail bus) to 2.5V 2.5A or Post regulator for SMPS to 1.5V with high current rating. Fast response transient minimise the output capacitor value. A minimum of 22F 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. Order codes Part number Tube Tape and Reel L4957AD1.5 L4957AD1.5TR L4957AD1.8 L4957AD1.8TR L4957AD2.5 L4957AD2.5TR L4957AD3.3 L4957AD3.3TR April 2006 Rev 6 1/12 www.st.com 12 Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) Contents L4957A Contents 1 Block diagram and typical application 3 2 Pin description . 4 2.1 Pin connection 4 2.2 Pin description 4 3 Maximum ratings 5 3.1 Absolute maximum ratings . 5 3.2 Thermal data . 5 4 Electrical characteristics . 6 5 Package mechanical data . 9 6 Revision history . 11 2/12 Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s)