E-L4957AD1_5| Datasheet

E-L4957AD1_5, E-L4957AD1_5TR, L4957A, L4957AD1_5TR, L4957AD1_8, L4957AD1_8TR, L4957AD2_5, L4957AD2_5TR, L4957AD3_3, L4957AD3_3TR, L4957AV1_8, L4957AV2_5, L4957AV3_3

Datasheet preview, take a look at Datasheets before downloading (Data Sheet is available on manufacturer site)

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 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
3 1

D2PAK

Description
The L4957AD devices are Ultra Low Drop Output linear regulators with an internal N-channel MOSFET of 200m 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 22uF 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.

Applications

Mother boards Processor I/O & supplies Low voltage memory & chip set supplies Graphic & sound cards Low voltage logic supplies Post regulator for SMPS

Order codes
Part number Tube L4957AD1.5 L4957AD1.8 L4957AD2.5 L4957AD3.3 April 2006 Rev 6 Tape and Reel L4957AD1.5TR L4957AD1.8TR L4957AD2.5TR L4957AD3.3TR 1/12
www.st.com 12