MIC5203
Micrel
MIC5203
µCap™ 80mA Low-Dropout Voltage Regulator
General Description
Features
The MIC5203 is a µCap™ 80mA linear voltage regulator with
very low dropout voltage (typically 20mV at light loads and
300mV at 80mA) and very low ground current (225µA at
20mA output), offering better than 3% initial accuracy with a
logic-compatible enable input.
• Tiny 4-lead and 5-lead surface-mount packages
• Wide Selection of output voltages
• Guaranteed 80mA output
• Low quiescent current
• Low dropout voltage
• Tight load and line regulation
• Low temperature coefficient
• Current and thermal limiting
• Reversed input polarity protection
• Zero off-mode current
The µCap™ regulator design is optimized to work with low-
value, low-cost ceramic capacitors. The outputs typically
require only 0.47µF of output capacitance for stability.
Designedespeciallyforhand-held,battery-powereddevices,
theMIC5203canbecontrolledbyaCMOSorTTLcompatible
logicsignal.Whendisabled,powerconsumptiondropsnearly
to zero. If on-off control is not required, the enable pin may be
tied to the input for 3-terminal operation. The ground current
of the MIC5203 increases only slightly in dropout, further
prolongingbatterylife. KeyMIC5203featuresincludecurrent
limiting, overtemperature shutdown, and protection against
reversed battery.
• Logic-controlled shutdown
• Stability with low-ESR ceramic capacitors
3
Applications
• Cellular telephones
• Laptop, notebook, and palmtop computers
• Battery-powered equipment
• Bar code scanners
• SMPS post-regulator/dc-to-dc modules
• High-efficiency linear power supplies
The MIC5203 is available in 2.8V, 3.0V, 3.3V, 3.6V, 3.8V,
4.0V, 4.5V, 4.75V, and 5.0V fixed voltages. Other voltages
are available; contact Micrel for details.
Typical Applications
Ordering Information
Part Number
Marking Voltage
Junction Temp. Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
SOT-143
SOT-143
SOT-143
SOT-143
SOT-143
SOT-143
SOT-143
SOT-143
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
Enable
Shutdown
MIC5203-3.0BM4
MIC5203-3.3BM4
MIC5203-3.6BM4
MIC5203-3.8BM4
MIC5203-4.0BM4
MIC5203-4.5BM4
MIC5203-4.7BM4
MIC5203-5.0BM4
MIC5203-2.8BM5
MIC5203-3.0BM5
MIC5203-3.3BM5
MIC5203-3.6BM5
MIC5203-3.8BM5
MIC5203-4.0BM5
MIC5203-4.5BM5
MIC5203-4.7BM5
MIC5203-5.0BM5
LA30
LA33
LA36
LA38
LA40
LA45
LA47
LA50
LA28
LK30
LK33
LK36
LK38
LK40
LK45
LK47
LK50
3.0V
3.3V
3.6V
3.8V
4.0V
4.5V
4.75V
5.0V
2.8V
3.0V
3.3V
3.6V
3.8V
4.0V
4.5V
4.75V
5.0V
LAxx
VOUT
0.47µF
SOT-143 Version
1
2
3
5
4
VOUT
0.47µF
Enable
Shutdown
SOT-23-5 Version
Other voltages available. Contact Micrel for details.
December 1998
3-141