
November 2000
1
MIC5211
MIC5211
Micrel
General Description
The MIC5211 is a dual
μ
Cap 80mA linear voltage regulator
with very low dropout voltage (typically 20mV at light loads),
very low ground current (225
μ
A at 20mA output current), and
better than 3% initial accuracy. This dual device comes in the
miniature SOT-23-6 package, featuring independent logic
control inputs.
The
μ
Cap regulator design is optimized to work with low-
value, low-cost ceramic capacitors. The outputs typically
require only 0.1
μ
F of output capacitance for stability.
Designed especially for hand-held, battery-powered devices,
ground current is minimized using Micrel’s proprietary Super
eta PNP technology to prolong battery life. When dis-
abled, power consumption drops nearly to zero.
Key features include SOT-23-6 packaging, current limiting,
overtemperature shutdown, and protection against reversed
battery conditions.
The MIC5211 is available in dual 1.8V, 2.5V, 2.7V, 2.8V,
3.0V, 3.3V, 3.6V, and 5.0V versions. Certain mixed voltages
are also available. Contact Micrel for other voltages.
Typical Application
1
6
2
3
4
0.1μF
0.1μF
Enable
Shutdown
Enable B
V
OUTA
MIC5211
V
IN
5
Enable
Shutdown
Enable A
V
OUTB
Features
Stable with low-value ceramic or tantalum capacitors
Independent logic controls
Low quiescent current
Low dropout voltage
Mixed voltages available
Tight load and line regulation
Low temperature coefficient
Current and thermal limiting
Reversed input polarity protection
Zero off-mode current
Dual regulator in tiny SOT-23 package
2.5V to 16V input range
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
Ordering Information
Part Number
MIC5211-1.8BM6
MIC5211-2.5BM6
MIC5211-2.7BM6
MIC5211-2.8BM6
MIC5211-3.0BM6
MIC5211-3.3BM6
MIC5211-3.6BM6
MIC5211-5.0BM6
Dual-Voltage Regulators
MIC5211-1.8/2.5BM6
MIC5211-1.8/3.3BM6
MIC5211-2.5/3.3BM6
MIC5211-3.3/5.0BM6
Other voltages available. Contact Micrel for details.
Marking
LFBB
LFCC
LFDD
LFEE
LFGG
LFLL
LFQQ
LFXX
Voltage
1.8V
2.5V
2.7V
2.8V
3.0V
3.3V
3.6V
5.0V
Junction Temp. Range
0
°
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-23-6
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
LFBC
LFBL
LFCL
LFLX
1.8V/2.5V
1.8V/3.3V
2.5V/3.3V
3.3V/5.0V
0
°
C to +125
°
C
0
°
C to +125
°
C
–
40
°
C to +125
°
C
–
40
°
C to +125
°
C
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
MIC5211
Dual
μ
Cap 80mA LDO Regulator
Preliminary Information
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com