MIC5501/2/3/4

Single 300mA LDO

Revision 2.0

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

January 14, 2013

Revision 2.0

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

high-

performance 300mA LDO in an ultra-small 1mm x 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.

Ideal for battery-powered applications, the MIC5501/2/3/4

offers 2% initial accuracy, low dropout voltage (160mV at

300mA), and low ground current (typically 38µA). The

MIC5501/2/3/4 can also be put into a zero-off-mode

current state, drawing virtually no current when disabled.

The MIC5501/2/3/4 has an operating junction temperature

range of –40°C to 125°C.

Datasheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

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 x 1.0mm Thin DFN package

Applications

• Smart phones

• DSC, GPS, PMP, and PDAs

• Medical devices

• Portable electronics

• 5V systems

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Typical Application