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MAX8887 概述
MAX8887 低噪声、低压差线性稳压器，在2.5V至5.5V的输入范围内工作，能提供300mA的电流。MAX8887 外接小型的2.2μF陶瓷电容就能稳定地工作，由于它具有使能关断模式、低静态电流和极低压差的特性，因此非常适合应用于电池供电设备。MAX8887 低压差特性允许器件在电池很低的极限电压时仍能继续工作，这大大增加了电池能量的使用效率。MAX8887 提供了1.2V、1.5V、1.8V、2.5V、2.8V、3V和3.3V输出电压版本。
MAX8887 特点
• MAX8887 保证300mA输出电流能力
• MAX8887 频率为1KHz时，PSRR达到60dB
• MAX8887 低输出噪声
• MAX8887 300mA负载时150mV低压差
• MAX8887 空载时55μA低静态电流
• MAX8887 关断时的电流 ≦ 1μA
• MAX8887 用2.2μF陶瓷电容就可稳定工作
• MAX8887 热关断和短路保护
• MAX8887 SOT23-5封装
• MAX8887 符合RoHS规范及Pb-Free
MAX8887 应用
• 无线手持设备
• DSP核电源
• 电池供电设备
• 便携式信息装备
概述
The MAX8887/MAX8888 low-dropout linear regulators operate from a 2.5V to 5.5V input and deliver up to 300mA continuous (500mA pulsed) current. The MAX8887 is optimized for low-noise operation, while the MAX8888 includes an open-drain power-OK (POK) ouput flag. Both regulators feature exceptionally low 100mV dropout at 200mA. These devices are available in a variety of preset output voltages in the 1.5V to 3.3V range.
An internal PMOS pass transistor allows the low 55µA supply current to remain independent of load, making these devices ideal for portable battery-powered equipment such as personal digital assistants (PDAs), cellular phones, cordless phones, and notebook computers. Other features include a micropower shutdown mode, short-circuit protection, thermal shutdown protection, and an active-low open-drain POK output that indicates when the output is out of regulation. The MAX8887/MAX8888 are available in a thin 5-pin SOT23 package that is only 1mm 。
关键特性
Guaranteed 300mA Output Current (500mA for Pulsed Loads)
Low 100mV Dropout at 200mA Load
POK Output (MAX8888)
42µVRMS Output Noise (MAX8887)
Preset Output Voltages (1.5V, 1.8V, 2.85V, and 3.3V)
55µA No-Load Supply Current
Thermal-Overload and Short-Circuit Protection
Foldback Output Current-Limit Protection
60dB PSRR at 1kHz
0.1µA Shutdown Current
Thin 5-Pin SOT23 Package, 1mm High
