L4957A集成电路（IC）的线性+开关稳压器规格书PDF中文资料

L4957A属于集成电路（IC）的线性+开关稳压器。由意法半导体集团制造生产的L4957A稳压器 - 线性线性稳压器用于提供稳定的输出电压，无论负载电流、输入电压或环境因素如何变化，这些输出电压通常都要保持不变。它们的工作原理要求输入电压维持在高于所需的输出电压，而且要超出某个最小量，并且在工作时会将输入端的任何多余电压转换为热量。对于大多数应用而言，虽然这种稳压器的效率低于开关模式的稳压器，但它们通常更适合对噪声高度敏感的应用。

DESCRIPTION

The L4957A devices are Ultra Low Drop Output linear regulators with an internal N-channel MOS of 200mΩ 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.

1.5V, 1.8V, 2.5V AND 3.3V FIXED OUTPUT VOLTAGE

3V TO 14V INPUT VOLTAGE RANGE

200mΩ 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

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