[Micrel]

General Description

The MIC5501/2/3/4 is an advanced general-purpose LDO ideal for powering general-purpose portable devices. The MIC5501/2/3/4 family of products provides a highperformance 300mA LDO in an ultra-small 1mm × 1mm package. The MIC5502 and MIC5504 LDOs include an auto-discharge feature on the output that is activated when the enable pin is low. The MIC5503 and MIC5504 have an internal pull-down resistor on the enable pin that disables the output when the enable pin is left floating. This is ideal for applications where the control signal is floating during processor boot up.

Features

• Input voltage range: 2.5V to 5.5V
• Fixed output voltages from 1.0V to 3.3V
• 300mA guaranteed output current
• High output accuracy (±2%)
• Low quiescent current: 38µA
• Stable with 1µF ceramic output capacitors
• Low dropout voltage: 160mV @ 300mA
• Output discharge circuit: MIC5502, MIC5504
• Internal enable pull-down: MIC5503, MIC5504
• Thermal-shutdown and current-limit protection
• 4-lead 1.0mm × 1.0mm Thin DFN package
• MIC5504 5-pin SOT23 package

Applications

• Smartphones
• DSC, GPS, PMP, and PDAs
• Medical devices
• Portable electronics
• 5V systems