MIC5208
Micrel
MIC5208
Dual 50mA LDO Voltage Regulator
Preliminary Information
General Description
The MIC5208 is a dual linear voltage regulator with very low
dropout voltage (typically 20mV at light loads and 250mV at
50mA), very low ground current (225µA at 10mA output), and
better than 3% initial accuracy. It also features individual
logic-compatible enable/shutdown control inputs.
Designed especially for hand-held battery powered devices,
the MIC5208 can be switched by a CMOS or TTL compatible
logic signal, or the enable pin can be connected to the supply
input for 3-terminal operation. When disabled, power con-
sumption drops nearly to zero. Dropout ground current is
minimized to prolong battery life.
Key features include current limiting, overtemperature shut-
down, and protection against reversed battery.
The MIC5208 is available in 3.0V, 3.3V, 3.6V, 4.0V and 5.0V
fixed voltage configurations. Other voltages are available;
contact Micrel for details.
Features
•
•
•
•
•
•
•
•
•
•
•
Micrel Mini 8™ MSOP package
Guaranteed 50mA output
Low quiescent current
Low dropout voltage
Wide selection of output voltages
Tight load and line regulation
Low temperature coefficient
Current and thermal limiting
Reversed input polarity protection
Zero off-mode current
Logic-controlled electronic enable
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
MIC5208-3.0BMM
MIC5208-3.3BMM
MIC5208-3.6BMM
MIC5208-4.0BMM
MIC5208-5.0BMM
Voltage
3.0
3.3
3.6
4.0
5.0
Accuracy
3%
3%
3%
3%
3%
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
Package
8-lead MSOP
8-lead MSOP
8-lead MSOP
8-lead MSOP
8-lead MSOP
Other voltages available. Contact Micrel for details.
Typical Application
MIC5208
Output A
Output B
1µF
1µF
1
2
3
4
8
7
6
5
Enable A
Enable B
Enable may be connected to VIN
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1997
MIC5208
Micrel
Pin Configuration
OUTA
GND
OUTB
GND
1
2
3
4
8
7
6
5
INA
ENA
INB
ENB
MIC5208BMM
Pin Description
Pin Number
1
2, 4
3
5
6
7
8
Pin Name
OUTA
GND
OUTB
ENB
INB
ENA
INA
Pin Function
Regulator Output A
Ground: Both pins must be connected together.
Regulator Output B
Enable/Shutdown B (Input): CMOS compatible input. Logic high = enable,
logic low or open = shutdown. Do not leave floating.
Supply Input B
Enable/Shutdown A (Input): CMOS compatible input. Logic high = enable,
logic low or open = shutdown. Do not leave floating.
Supply Input A
3
1997
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MIC5208
Micrel
Absolute Maximum Ratings
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
Recommended Operating Conditions
Supply Input Voltage (V
IN
) ............................... 2.5V to 16V
Enable Input Voltage (V
EN
) ................................. 0V to 16V
Junction Temperature (T
J
) ....................... –40°C to +125°C
8-lead MSOP
(θ
JA
) ...................................................
Note 1
Electrical Characteristics
V
IN
= V
OUT
+ 1V; I
L
= 1mA; C
L
= 1µF, and V
EN
≥
2.0V; T
J
= 25°C,
bold
values indicate –40°C to +125°C;
for one-half of dual MIC5208; 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 4
Conditions
variation from nominal V
OUT
Note 2
V
IN
= V
OUT
+1V to 16V
I
L
= 0.1mA to 50mA,
Note 3
I
L
= 100µA
I
L
= 20mA
I
L
= 50mA
V
EN
≤
0.4V (shutdown)
V
EN
≥
2.0V (enabled), I
L
= 100µA
I
L
= 20mA
I
L
= 50mA
V
IN
= 0.5V less than designed V
OUT
,
Note 5
V
OUT
= 0V
Note 6
Min
–3
–4
50
0.008
0.08
20
200
250
0.01
180
225
850
200
180
0.05
Typical
Max
3
4
200
0.3
0.5
0.3
0.5
350
500
10
750
1200
300
250
Units
%
%
ppm/°C
%
%
%
%
mV
mV
mV
µA
µA
µA
µA
µA
mA
%/W
I
Q
I
GND
Quiescent Current
Ground Pin Current
Note 5
Ground Pin Current at Dropout
Current Limit
Thermal Regulation
I
GNDDO
I
LIMIT
∆V
O
/∆P
D
Control Input
V
IL
V
IH
I
IL
I
IH
General Note:
Note 1:
Input Voltage Level
Logic Low
Logic High
Control Input Current
shutdown
enabled
V
IL
≤
0.6V
V
IH
≥
2.0V
0.6
2.0
0.01
15
1
50
V
V
µA
µA
Devices are ESD protected, however, handling precautions are recommended.
Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when
operating the device outside of its rated operating conditions. The maximum allowable power dissipation is a function of the maximum
junction temperature, T
J(max)
, the junction-to-ambient thermal resistance,
θ
JA
, and the ambient temperature, T
A
. The maximum allowable
power dissipation at any ambient temperature is calculated using: P
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.
θ
JA
of the 8-lead MSOP is 200°C/W,
mounted on a PC board.
Output voltage temperature coefficient 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. Changes in output voltage due to heating effects
are covered by the 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.
Ground pin current is the regulator quiescent current 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 2:
Note 3:
Note 4:
Note 5:
Note 6:
3-170
1997
MIC5208
Micrel
Typical Characteristics
1000
Dropout Voltage
vs. Output Current
400
Dropout Voltage
vs. Temperature
4
Dropout Characteristics
(MIC5208-3.3)
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
3
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
60
40
20
0
-20
-40
-60
100
50
0
∆
OUTPUT (mV)
Thermal Regulation
(MIC5208-3.3)
C
IN
= 10µF
C
OUT
= 1µF
LOAD (mA)
7
1
2
3
4
5
6
INPUT VOLTAGE (V)
C
L
= 1µF
-50
-2
0 2 4 6 8 10 12 14 16
TIME (ms)
Output Voltage
vs. Temperature
4.0
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
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
200
180
160
140
120
Short Circuit Current
vs. Temperature
3.5
MIN. SUPPLY VOLTAGE (V)
Minimum Supply Voltage
vs. Temperature
I
L
= 1mA
VOUT = 3.3V
3.4
C
IN
= 10µF
C
OUT
= 1µF
C
IN
= 10µF
C
OUT
= 1µF
3.3
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
2.4
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
100
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
1997
3-171
MIC5208
Micrel
Typical Characteristics
Output Impedance
OUTPUT (mA)
∆
OUTPUT (mV)
Load Transient
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
OUTPUT (mA)
∆
OUTPUT (mV)
Load Transient
100
0
-100
100
-200
50
0
-50
-5
0
5
10
TIME (ms)
15
20
C
OUT
= 10µF
V
IN
= V
OUT
+ 1
1000
200
OUTPUT IMPEDANCE (Ω)
100
10
1
0.1
I
L
= 100µA
I
L
= 1mA
I
L
= 50mA
1x10
0
10x10
0
100x10
0
1x10
3
10x10
3
100x10
3
FREQUENCY (Hz)
Ripple Voltage
vs. Frequency
∆
OUTPUT (V)
1x10
6
0.01
Line Transient
(MIC5208-3.3)
C
L
= 1µF
I
L
= 1mA
Line Transient
(MIC5208-3.3)
∆
OUTPUT (V)
2
1
0
8
-1
C
L
= 11µF
I
L
= 1mA
100
3
2
1
0
-1
8
-2
RIPPLE VOLTAGE (dB)
80
60
40
20
0
I
L
= 100µA
C
L
= 1µF
V
IN
= V
OUT
+ 1
INPUT (V)
6
4
2
-0.2
0.0
0.2 0.4 0.6
TIME (ms)
0.8
1.0
INPUT (V)
6
4
2
-0.2
0.0
0.2 0.4 0.6
TIME (ms)
0.8
1.0
10x10
0
100x10
0
1x10
3
3
100x10
3
FREQUENCY (Hz)
Ripple Voltage
vs. Frequency
100
10x10
1x10
6
Enable Characteristics
(MIC5208-3.3)
OUTPUT (V)
OUTPUT (V)
4.0
3.0
2.0
1.0
0.0
4
-1.0
ENABLE (V)
C
L
= 1µF
I
L
= 100µA
5
4
3
2
1
0
4
-1
2
0
Enable Characteristics
(MIC5208-3.3)
RIPPLE VOLTAGE (dB)
80
60
40
20
0
I
L
= 1mA
C
L
= 1µF
V
IN
= V
OUT
+ 1
C
L
= 1µF
I
L
= 100µA
2
0
-2
-2
0
2
4
6
TIME (µs)
8
10
ENABLE (V)
10x10
0
100x10
0
1x10
3
100x10
3
1x10
6
FREQUENCY (Hz)
10x10
-2
-0.2
0.0
3
0.2 0.4 0.6
TIME (ms)
0.8
1.0
Ripple Voltage
vs. Frequency
100
ENABLE VOLTAGE (mV)
Enable Voltage
vs. Temperature
1.50
Enable Current
vs. Temperature
40
ENABLE CURRENT (µA)
C
IN
= 10µF
C
OUT
= 1µF
I
L
= 1mA
RIPPLE VOLTAGE (dB)
80
60
40
20
0
I
L
= 50mA
C
L
= 1µF
V
IN
= V
OUT
+ 1
1.25
C
IN
= 10µF
C
OUT
= 1µF
I
L
= 1mA
30
1.00
V
OFF
0.75
V
ON
20
V
EN
= 2V
V
EN
= 5V
10
10x10
0
100x10
0
1x10
3
100x10
3
FREQUENCY (Hz)
10x10
1x10
6
0.50
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
3
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1997
嵌入式系统
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