MIC5211
Micrel, Inc.
MIC5211
Dual µCap 80mA LDO Regulator
General Description
The MIC5211 is a dual µCap 80mA linear voltage regulator
with very low dropout voltage (typically 20mV at light loads),
very low ground current (225µA 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 µCap regulator design is optimized to work with low-value,
low-cost ceramic capacitors. The outputs typically require
only 0.1µF of output capacitance for stability.
Designed especially for hand-held, battery-powered devices,
ground current is minimized using Micrel’s proprietary Super
ßeta PNP™ technology to prolong battery life. When disabled,
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.
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
Typical Application
V
IN
Enable
Shutdown
1
2
3
MIC5211
5
6
EnableA
V
OUTA
0.1µF
0.1µF
V
OUTB
Enable
Shutdown
4
EnableB
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
May 2006
1
MIC5211
MIC5211
Micrel, Inc.
Ordering Information
Part Number
Standard
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
LFBC
LFBL
LFCL
LFLX
MIC5211-1.8/2.5YM6
MIC5211-1.8/3.3YM6
MIC5211-2.5/3.3YM6
MIC5211-3.3/5.0YM6
MIC5211-BCYM6
MIC5211-BLYM6
MIC5211-CLYM6
MIC5211-LXYM6
LFBC
LFBL
LFCL
LFLX
1.8V / 2.5V
1.8V / 3.3V
2.5V / 3.3V
3.3V / 5.0V
0ºC to +125ºC
0ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
Mark Code
LFBB
LFCC
LFDD
LFEE
LFGG
LFLL
LFQQ
LFXX
Full
MIC5211-1.8YM6
Contact Factory
MIC5211-2.7YM6
MIC5211-2.8YM6
MIC5211-3.0YM6
MIC5211-3.3YM6
MIC5211-3.6YM6
MIC5211-5.0YM6
Pb-Free Part Number
Manufacturing
Mark Code
LFBB
LFCC
LFDD
LFEE
LFGG
LFLL
LFQQ
LFXX
Voltage
Side A / Side B
1.8V
2.5V
2.7V
2.8V
3.0V
3.3V
3.6V
5.0V
Temperature
Range
0ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
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
Other voltages available. Contact Micrel for details.
Pin Configuration
Pin 1
Index
OUTA
IN
OUT B
6
5
4
LFxx
1
Part
Identification
3
2
ENA GND E N B
RegulatorA
Voltage Code
(V
OUTA
)
RegulatorB
Voltage Code
(V
OU TB
)
Pin Description
Pin Number
1
2
3
4
5
6
Pin Name
ENA
GND
ENB
OUTB
IN
OUTA
Pin Function
Enable/Shutdown A (Input): CMOS compatible input. Logic high = enable,
logic low or open = shutdown.
Ground
Enable/Shutdown B (Input): CMOS compatible input. Logic high = enable,
logic low or open = shutdown.
Regulator Output B
Supply Input
Regulator Output A
MIC5211
2
May 2006
MIC5211
Micrel, Inc.
Absolute Maximum Ratings (Note 1)
Supply Input Voltage (V
IN
) ..............................–20V to +20V
Enable Input Voltage (V
EN
) ............................–20V to +20V
Power Dissipation (P
D
) ............................. Internally Limited
Storage Temperature Range .................... –60°C to +150°C
Lead Temperature (soldering, 5 sec.) ........................ 260°C
ESD,
(Note 3)
......................................................................
Operating Ratings (Note 2)
Supply Input Voltage (V
IN
) .................................2.5V to 16V
Enable Input Voltage (V
EN
) ..................................0V to 16V
Junction Temperature (T
J
) (except 1.8V).. –40°C to +125°C
1.8V only................................................... 0°C to +125°C
6-lead SOT-23-6
(θ
JA
) .............................................
Note 4
Electrical Characteristics
V
IN
= V
OUT
+ 1V; I
L
= 1mA; C
L
= 0.1µF, and V
EN
≥ 2.0V; T
J
= 25°C,
bold
values indicate –40°C to +125°C;
for one-half of dual MIC5211; unless noted.
Symbol
V
O
ΔV
O
/ΔT
ppm/°C
ΔV
O
/V
O
ΔV
O
/V
O
V
IN
– V
O
Parameter
Output Voltage
Accuracy
Output Voltage
Temperature Coeffcient
Line Regulation
Load Regulation
Dropout Voltage,
Note 7
V
IN
= V
OUT
+1V to 16V
I
L
= 0.1mA to 50mA,
Note 6
I
L
= 100µA
I
L
= 50mA
I
L
= 20mA
0.008
0.08
20
200
250
0.01
90
225
750
140
0.05
450
1200
250
450
500
10
0.3
0.5
0.3
0.5
%
%
%
%
mV
mV
mV
µA
µA
µA
µA
mA
%/W
Conditions
variation from nominal V
OUT
Note 5
Min
–3
–4
50
Typical
Max
3
4
200
Units
%
%
I
Q
Quiescent Current
Ground Pin Current
Note 8
Current Limit
Thermal Regulation
Enable Input Voltage Level
I
GND
V
EN
≤ 0.4V (shutdown)
I
L
= 20mA (active)
V
EN
≥ 2.0V, I
L
= 100µA (active)
I
LIMIT
I
L
= 50mA (active)
V
OUT
= 0V
Note 9
ΔV
O
/ΔP
D
Enable Input
V
IL
V
IH
I
IL
I
IH
Note 1:
Note 2:
Note 3:
Note 4:
logic low (off)
logic high (on)
V
IL
≤ 0.6V
V
IH
≥ 2.0V
2.0
0.01
3
0.6
1
50
V
V
µA
µA
Enable Input Current
Exceeding the absolute maximum rating may damage the device.
The device is not guareented to function outside itsperating rating.
Devices are ESD sensitive. Handling precautions recommended.
The maximum allowable power dissipation at any T
A
(ambient temperature) is P
D(max)
= (T
J(max)
– T
A
) /
θ
JA
. Exceeding the maximum allow-
able power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The
θ
JA
is 220°C/W for the
SOT-23-6 mounted on a printed circuit board.
Output voltage temperature coeffiecient is defined as the worst case voltage change divided by the total temperature range.
Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load
range from 0.1mA to 50mA. Change in output voltage due to heating effects are covered by thermal regulation specification.
Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V
differential. For output voltages below 2.5V, dropout voltage is the input-to-output voltage differential with the minimum voltage being 2.5V.
Minimum input opertating voltage is 2.5V.
Ground pin current is the quiescent current per regulator plus pass transistor base current. The total current drawn from the supply is the sum
of the load current plus the ground pin current.
Thermal regulation is defined as the change in output voltage at a time “t” after a change in power dissipation is applied, excluding load or line
regulation effects. Specifications are for a 50mA load pulse at V
IN
= 16V for t = 10ms.
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
May 2006
3
MIC5211
MIC5211
Micrel, Inc.
Typical Characteristics
MIC5211
4
May 2006
MIC5211
Micrel, Inc.
May 2006
5
MIC5211
嵌入式系统
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