MIC5211
Micrel
MIC5211
Dual
µ
Cap 80mA LDO Regulator
Preliminary Information
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 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.
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
MIC5211-1.8/2.5BM6
MIC5211-1.8/3.3BM6
MIC5211-2.5/3.3BM6
Marking
LFBB
LFCC
LFDD
LFEE
LFGG
LFLL
LFQQ
LFXX
LFBC
LFBL
LFCL
LFLX
Voltage
1.8V
2.5V
2.7V
2.8V
3.0V
3.3V
3.6V
5.0V
1.8V/2.5V
1.8V/3.3V
2.5V/3.3V
3.3V/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
0°C to +125°C
0°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
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
Dual-Voltage Regulators
Typical Application
MIC5211-3.3/5.0BM6
Other voltages available. Contact Micrel for details.
V
IN
MIC5211
Enable
Shutdown
1
2
3
6
5
4
Enable A
Enable
Shutdown
V
OUTA
0.1µF
0.1µF
V
OUTB
Enable B
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
November 2000
1
MIC5211
MIC5211
Micrel
Pin Configuration
OUTA IN OUTB
6
5
4
Pin 1
Index
1
LFxx
2
3
Part
Identification
ENA GND ENB
Regulator A
Voltage Code
(V
OUTA
)
Regulator B
Voltage Code
(V
OUTB
)
Voltage
1.8V
2.5V
2.7V
2.8V
3V
3.15V
3.3V
3.6V
5V
Code
B
C
D
E
G
H
L
Q
X
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
November 2000
MIC5211
Micrel
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
∆V
O
/∆T
∆V
O
/V
O
∆V
O
/V
O
V
IN
– V
O
Parameter
Output Voltage
Accuracy
Output Voltage
Temperature Coeffcient
Line Regulation
Load Regulation
Dropout Voltage,
Note 7
Conditions
variation from nominal V
OUT
Note 5
V
IN
= V
OUT
+1V to 16V
I
L
= 0.1mA to 50mA,
Note 6
I
L
= 100µA
I
L
= 20mA
I
L
= 50mA
I
Q
I
GND
Quiescent Current
Ground Pin Current
Note 8
V
EN
≤
0.4V (shutdown)
V
EN
≥
2.0V, I
L
= 100µA (active)
I
L
= 20mA (active)
I
L
= 50mA (active)
I
LIMIT
∆V
O
/∆P
D
Enable Input
Enable Input Voltage Level
V
IL
V
IH
I
IL
I
IH
Note 1:
Note 2:
Note 3:
Note 4:
Min
–3
–4
Typical
Max
3
4
Units
%
%
ppm/°C
%
%
%
%
mV
50
0.008
0.08
20
200
250
0.01
90
225
750
140
0.05
200
0.3
0.5
0.3
0.5
450
500
10
mV
mV
µA
µA
µA
µA
mA
%/W
450
1200
250
Current Limit
Thermal Regulation
V
OUT
= 0V
Note 9
logic low (off)
logic high (on)
Enable Input Current
V
IL
≤
0.6V
V
IH
≥
2.0V
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.
0.6
2.0
0.01
3
1
50
V
V
µA
µA
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
allowable 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:
November 2000
3
MIC5211
MIC5211
Micrel
Typical Characteristics
1000
Dropout Voltage
vs. Output Current
400
Dropout Voltage
vs. Temperature
4
Dropout Characteristics
(MIC5211-3.3)
OUTPUT VOLTAGE (V)
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (V)
C
IN
= 10µF
C
OUT
= 1µF
100
300
C
IN
= 10µF
C
OUT
= 1µF
I
L
= 50mA
3
I
L
= 100µA
200
I
L
= 100µA
2
I
L
= 50mA
C
IN
= 10µF
C
OUT
= 1µF
0
1
2
3
4
5
6
SUPPLY VOLTAGE (V)
7
10
100
I
L
= 1mA
1
1
0.01
0.1
1
10
100
OUTPUT CURRENT (mA)
0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
0
2000
Ground Current
vs. Output Current
2.0
Ground Current
vs. Supply Voltage
3.0
Ground Current
vs. Temperature
GROUND CURRENT (mA)
2.5
2.0
1.5
1.0
0.5
I
L
= 50mA
I
L
= 100µA
C
IN
= 10µF
C
OUT
= 1µF
GROUND CURRENT (mA)
GROUND CURRENT (µA)
1500
1.5
I
L
= 100µA
1.0
I
L
= 50mA
V
OUT
= 3.3V
1000
500
V
IN
= V
OUT
+ 1V
0
0
10 20 30 40 50 60 70 80
OUTPUT CURRENT (mA)
0.5
0.0
0
1
2
3
4
5
6
SUPPLY VOLTAGE (V)
7
0.0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
Output Voltage
vs. Output Current
SHORT CIRCUIT CURRENT (mA)
4.0
OUTPUT VOLTAGE (V)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
50
100
150
200
OUTPUT CURRENT (mA)
C
IN
= 10µF
C
OUT
= 1µF
160
140
120
100
80
60
40
20
0
0
Short Circuit Current
vs. Input Voltage
OUTPUT VOLTAGE (V)
Output Voltage
vs. Temperature
4.0
3.8
3.6
3.4
3.2
3.0
2.8
2.6
3 DEVICES
HI / AVG / LO
CURVES APPLICABLE
AT 100µA AND 50mA
C
IN
= 10µF
C
OUT
= 1µF
C
IN
= 10µF
C
OUT
= 1µF
1
2
3
4
5
6
INPUT VOLTAGE (V)
7
2.4
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
Short Circuit Current
vs. Temperature
200
OUTPUT CURRENT (mA)
180
160
140
120
100
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
C
IN
= 10µF
C
OUT
= 1µF
MIC5211
4
November 2000
MIC5211
Micrel
Load Transient
OUTPUT (mA)
∆
OUTPUT (mV)
Load Transient
OUTPUT (mA)
∆
OUTPUT (mV)
200
0
-200
100
-400
50
0
-50
-1
0
1
2 3 4 5
TIME (ms)
6
7
8
C
OUT
= 1µF
V
IN
= V
OUT
+ 1
100
0
-100
100
-200
50
0
-50
-5
0
5
10
TIME (ms)
15
20
C
OUT
= 10µF
V
IN
= V
OUT
+ 1
Line Transient
(MIC5211-3.3)
∆
OUTPUT (V)
C
L
= 1µF
I
L
= 1mA
∆
OUTPUT (V)
Line Transient
(MIC5211-3.3)
2
1
0
8
-1
INPUT (V)
3
2
1
0
-1
8
-2
C
L
= 11µF
I
L
= 1mA
INPUT (V)
6
4
2
-0.2
0.0
0.2 0.4 0.6
TIME (ms)
0.8
1.0
6
4
2
-0.2
0.0
0.2 0.4 0.6
TIME (ms)
0.8
1.0
Ripple Voltage
vs. Frequency
100
100
Ripple Voltage
vs. Frequency
100
Ripple Voltage
vs. Frequency
RIPPLE VOLTAGE (dB)
RIPPLE VOLTAGE (dB)
80
60
40
20
0
RIPPLE VOLTAGE (dB)
80
60
40
20
0
80
60
40
20
0
I
L
= 100µA
C
L
= 1µF
V
IN
= V
OUT
+ 1
I
L
= 1mA
C
L
= 1µF
V
IN
= V
OUT
+ 1
I
L
= 50mA
C
L
= 1µF
V
IN
= V
OUT
+ 1
10x10
0
100x10
0
1x10
3
10x10
3
100x10
3
1x10
6
10x10
0
100x10
0
1x10
3
10x10
3
3
1x10
6
10x10
0
100x10
0
1x10
3
10x10
3
100x10
3
FREQUENCY (Hz)
FREQUENCY (Hz)
100x10
FREQUENCY (Hz)
November 2000
5
MIC5211
1x10
6
嵌入式系统
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