MIC5280

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

January 2009

M9999-012209-A

General Description

The MIC5280 is a high performance low dropout regulator,

offering a very low noise output with a very wide input

voltage operating range, up to 120V DC input voltage.

Ideal for high input voltage applications such as industrial

and telecom, the MIC5280 offers 2% initial accuracy,

extremely high power supply rejection ratio (PSRR >

80dB) and low ground current (typically 31µA). The

MIC5280 can also be put into a zero-off-mode current

state, drawing a minuscule amount of current when

disabled.

The MIC5280 has a very wide input voltage range, with a

DC rating from –24V to 120V. The MIC5280 is optimized

for line transient response, making it ideal for harsh

environment applications.

The MIC5280 has an operating junction temperature range

of –40°C to +125°C and is available in an adjustable

output voltage version in a lead-free (RoHS compliant) 8-

pin EPAD SOIC packaging.

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

• Wide input voltage range: 4.5V to 120V DC

• Very low quiescent current: 31µA typical

• 25mA guaranteed output current

• Adjustable output from 1.215V to 5V

• DC voltage protection down to -24V

• Ability to withstand up to +120V DC at the input

• Stable with ceramic output capacitors

• Ultra High PSRR > 80dB for RF applications

• High output accuracy

– ± 2% initial accuracy

– ± 3% over temperature (–40°C to +125°C)

• Thermal shutdown and current limit protection

• Thermally efficient 8-pin EPAD SOIC package

Applications

• Industrial applications

• Remote keyless entry power supply

• Telecom applications

• Off-line power supplies

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Typical Application

Telecom Application