MIC5203
Micrel
3
General Description
The MIC5203 is a
µ
Cap™ 80mA linear voltage regulator with
very low dropout voltage (typically 20mV at light loads and
300mV at 80mA) and very low ground current (225
µ
A at
20mA output), offering better than 3% initial accuracy with a
logic-compatible enable input.
The
µ
Cap™ regulator design is optimized to work with low-
value, low-cost ceramic capacitors. The outputs typically
require only 0.47
µ
F of output capacitance for stability.
Designed especially for hand-held, battery-powered devices,
the MIC5203 can be controlled by a CMOS or TTL compatible
logic signal. When disabled, power consumption drops nearly
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
prolonging battery life. Key MIC5203 features include current
limiting, overtemperature shutdown, and protection against
reversed battery.
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
Enable
Shutdown
LAxx
V
OUT
0.47µF
SOT-143 Version
1
5
2
3
4
0.47µF
V
OUT
Enable
Shutdown
L
K
x
x
SOT-23-5 Version
Ordering Information
Part Number
Marking
Voltage
Junction Temp. Range
Package
MIC5203-3.0BM4
LA30
3.0V
–40
°
C to +125
°
C
SOT-143
MIC5203-3.3BM4
LA33
3.3V
–40
°
C to +125
°
C
SOT-143
MIC5203-3.6BM4
LA36
3.6V
–40
°
C to +125
°
C
SOT-143
MIC5203-3.8BM4
LA38
3.8V
–40
°
C to +125
°
C
SOT-143
MIC5203-4.0BM4
LA40
4.0V
–40
°
C to +125
°
C
SOT-143
MIC5203-4.5BM4
LA45
4.5V
–40
°
C to +125
°
C
SOT-143
MIC5203-4.7BM4
LA47
4.75V
–40
°
C to +125
°
C
SOT-143
MIC5203-5.0BM4
LA50
5.0V
–40
°
C to +125
°
C
SOT-143
MIC5203-2.8BM5
LA28
2.8V
–40
°
C to +125
°
C
SOT-23-5
MIC5203-3.0BM5
LK30
3.0V
–40
°
C to +125
°
C
SOT-23-5
MIC5203-3.3BM5
LK33
3.3V
–40
°
C to +125
°
C
SOT-23-5
MIC5203-3.6BM5
LK36
3.6V
–40
°
C to +125
°
C
SOT-23-5
MIC5203-3.8BM5
LK38
3.8V
–40
°
C to +125
°
C
SOT-23-5
MIC5203-4.0BM5
LK40
4.0V
–40
°
C to +125
°
C
SOT-23-5
MIC5203-4.5BM5
LK45
4.5V
–40
°
C to +125
°
C
SOT-23-5
MIC5203-4.7BM5
LK47
4.75V
–40
°
C to +125
°
C
SOT-23-5
MIC5203-5.0BM5
LK50
5.0V
–40
°
C to +125
°
C
SOT-23-5
Other voltages available. Contact Micrel for details.
Features
•
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
•
Logic-controlled shutdown
•
Stability with low-ESR ceramic capacitors
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
MIC5203
µ
Cap™ 80mA Low-Dropout Voltage Regulator