July 1998
1
MIC5201
MIC5201
Micrel
MIC5201
200mA Low-Dropout Regulator
Final Information
General Description
The MIC5201 is an efficient linear voltage regulator with very
low dropout voltage (typically 17mV at light loads and 200mV
at 100mA), and very low ground current (1mA at 100mA
output), offering better than 1% initial accuracy with a logic
compatible on-off switching input.
Designed especially for hand-held battery powered devices,
the MIC5201 can be switched by a CMOS or TTL compatible
enable signal. This enable control may be connected directly
to V
IN
if unneeded. When disabled, power consumption
drops nearly to zero. The ground current of the MIC5201
increases only slightly in dropout, further prolonging battery
life. Key MIC5201 features include current limiting,
overtemperature shutdown, and protection against reversed
battery.
The MIC5201 is available in several fixed voltages and
accuracy configurations. It features the same pinout as the
LT1121 with better performance. Other options are available;
contact Micrel for details.
Typical Application
ENABLE
SHUTDOWN
MIC5201-3.3
IN
OUT
GND
1F
V
OUT
3.3V
EN
Features
High output voltage accuracy
Variety of output voltages
Guaranteed 200mA output
Low quiescent current
Low dropout voltage
Extremely tight load and line regulation
Very low temperature coefficient
Current and thermal limiting
Reversed-battery protection
Load-dump protection (fixed voltage versions)
Zero off-mode current
Logic-controlled electronic enable
Available in SO-8 and SOT-223 packages
Applications
Cellular telephones
Laptop, notebook, and palmtop computers
Battery powered equipment
PCMCIA V
CC
and V
PP
regulation/switching
Bar code scanners
SMPS post-regulator/ dc-to-dc modules
High-efficiency linear power supplies
MM8 is a trademark of Micrel, Inc.
Ordering Information
Part Number
Voltage
Junction Temp. Range*
Package
MIC5201BM
Adj
40
C to +125
C
SO-8
MIC5201-3.0BM
3.0
40
C to +125
C
SO-8
MIC5201-3.3BM
3.3
40
C to +125
C
SO-8
MIC5201-5.0BM
5.0
40
C to +125
C
SO-8
MIC5201-3.0BS
3.0
40
C to +125
C
SOT-223
MIC5201-3.3BS
3.3
40
C to +125
C
SOT-223
MIC5201-4.8BS
4.85
40
C to +125
C
SOT-223
MIC5201-5.0BS
5.0
40
C to +125
C
SOT-223
Other voltages available. Contact Micrel for details.
* Junction Temperature.
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com
MIC5201
Micrel
MIC5201
2
July 1998
Pin Configuration
IN
OUT
GND
1
3
2
TAB
GND
MIC5201-x.xBS
SOT-223
Fixed
1
2
3
4
8
7
6
5
IN
NC
NC
EN
OUT
NC
GND
NC
MIC5201-x.xBM
8-Lead SOIC
Fixed
1
2
3
4
8
7
6
5
IN
NC
NC
EN
OUT
ADJ
GND
NC
MIC5201BM
8-Lead SOIC
Adjustable
Pin Description
Pin No.
Pin No.
Pin No.
Pin Name
Pin Function
SOT-223
SO-8 Adj. SO-8 Fixed
3
1
1
OUT
Regulated Output
2
ADJ
Feedback Input: (Adjustable version only)
4, 6, 7
2, 4, 6, 7
NC
not internally connected: Connect to ground plane for lowest thermal
resistance.
2
3
3
GND
Ground
5
5
EN
Enable (Input): TTL compatible input. High = enable.
Low or open = off/disable.
1
8
8
V
IN
Unregulated Supply Input
Absolute Maximum Ratings
Supply Input Voltage (V
IN
) Fixed .................. 20V to +60V
Supply Input Voltage (V
IN
) Adjustable .......... 20V to +20V
Enable Input Voltage (V
EN
) Fixed ................. 20V to +60V
Enable Input Voltage (V
EN
) Adjustable ......... 20V to +20V
Power Dissipation (P
D
) ............................ Internally Limited
Junction Temperature (T
J
) ....................... 40
C to +125
C
Lead Temperature (soldering, 5 sec.) ....................... 260
C
Operating Ratings
Supply Input Voltage (V
IN
) Fixed ................... 2.5V to +26V
Supply Input Voltage (V
IN
) Adjustable ........... 2.5V to +16V
Enable Input Voltage (V
EN
) .................................. 0V to V
IN
Junction Temperature (T
J
) ....................... 40
C to +125
C
July 1998
3
MIC5201
MIC5201
Micrel
Electrical Characteristics
V
IN
= V
OUT
+ 1V; I
L
= 100
A; C
L
= 3.3
F; V
EN
2.0V; T
J
= 25
C, bold values indicate 40
C
T
J
+85
C; unless noted
Symbol
Parameter
Condition
Min
Typ
Max
Units
V
O
Output Voltage Accuracy
Variation from specified V
OUT
1
1
%
2
2
%
V
O
/
T
Output Voltage Temperature Coef.
Note 2
40
150
ppm/
C
V
O
/V
O
Line Regulation, Fixed
V
IN
= V
OUT
+ 1V to 26V
0.004
0.20
%
0.40
%
V
O
/V
O
Line Regulation, Adjustable
V
IN
= V
OUT
+ 1V to 16V
0.004
0.20
%
0.40
%
V
O
/V
O
Load Regulation
I
L
= 0.1mA to 200mA, Note 3
0.04
0.16
%
0.30
%
V
IN
V
O
Dropout Voltage, Note 4
I
L
= 100
A
17
mV
I
L
= 20mA
130
mV
I
L
= 50mA
180
mV
I
L
= 100mA
225
mV
I
L
= 200mA
270
400
mV
I
GND
Quiescent Current
V
ENABLE
0.7V (shutdown)
0.01
A
I
GND
Ground Pin Current
I
L
= 100
A
130
A
I
L
= 20mA
270
400
A
I
L
= 50mA
500
A
I
L
= 100mA
1000
2000
A
I
L
= 200mA
3000
A
PSRR
Ripple Rejection
75
dB
I
GNDDO
Ground Pin Current at Dropout
V
IN
= 0.5V less than specified V
OUT
,
270
330
A
I
L
= 100
A, Note 5
I
LIMIT
Current Limit
V
OUT
= 0V
280
500
mA
V
O
/
P
D
Thermal Regulation
Note 6
0.05
%/W
e
n
Output Noise
100
V
Enable Input
V
IL
Input Voltage Level
logic low (off)
0.7
V
V
IH
Input Voltage Level
logic high (on)
2.0
V
I
IL
Enable Input Current
V
IL
0.7V
0.01
1
A
I
IH
Enable Input Current
V
IH
2.0V
15
50
A
Reference (MIC5201 Adjustable Version Only)
V
REF
Reference Voltage
1.223
1.242
1.255
V
1.217
1.267
V
I
IL
Reference Voltage Temp. Coef.
20
ppm/
C
General Note: Devices are ESD sensitive. Handling precautions recommended.
Note 1:
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,
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
)
JA
. Exceeding the maximum allowable power dissipation
will result in excessive die temperature, and the regulator will go into thermal shutdown. The
JC
of the MIC5201-x.xBS is 15
C/W and
JA
for
the MIC5201BM is 160
C/W mounted on a PC board (see "Thermal Considerations" section for further details).
Note 2:
Output voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range.
Note 3:
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 200mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
Note 4:
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.
Note 5:
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.
Note 6:
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 200mA load pulse at V
IN
= 26V for fixed and V
IN
= 16V for adjustable at t = 10ms.
MIC5201
Micrel
MIC5201
4
July 1998
Block Diagrams
Current Limit
Thermal Shutdown
IN
OUT
GND
Bandgap
Ref.
C
OUT
V
OUT
V
IN
MIC5201-x.xBS
Fixed Regulator (SOT-223 version only)
IN
EN
OUT
GND
V
REF
Bandgap
Ref.
Current Limit
Thermal Shutdown
C
OUT
V
OUT
V
IN
MIC5201-x.xBM
Fixed Regulator
IN
EN
OUT
GND
V
REF
Bandgap
Ref.
Current Limit
Thermal Shutdown
C
OUT
V
OUT
V
IN
R1
R2
MIC5201BM [adj.]
ADJ
Adjustable Regulator
July 1998
5
MIC5201
MIC5201
Micrel
Typical Characteristics
0
50
100
150
200
250
0.01
0.1
1
10
100
1000
DROPOUT VOLTAGE (mV)
OUTPUT CURRENT (mA)
Dropout Voltage
vs. Output Current
0.0
0.1
0.2
0.3
0.4
-60 -30
0
30
60
90 120 150
DROPOUT VOLTAGE (V)
TEMPERATURE (
C)
Dropout Voltage
vs. Temperature
I
L
= 100mA
I
L
= 1mA
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
2
4
6
8
10
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Dropout
Characteristics
I
L
= 100mA
I
L
= 100
A, 1mA
0.1
1
10
0.01
0.1
1
10
100
GROUND CURRENT (mA)
OUTPUT CURRENT (mA)
Ground Current
vs. Output Current
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0
2
4
6
8
10
GROUND CURRENT (mA)
SUPPLY VOLTAGE (V)
Ground Current
vs. Supply Voltage
I
L
= 100mA
I
L
= 1mA
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0.0
0.1
0.2
0.3
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (A)
Output Voltage
vs. Output Current
C
IN
= 2.2
F
C
OUT
= 4.7
F
0.15
0.20
0.25
0.30
-60 -30
0
30
60
90 120 150
GROUND CURRENT (mA)
TEMPERATURE (
C)
Ground Current
vs. Temperature
I
LOAD
= 100
A
C
IN
= 2.2
F
C
OUT
= 4.7
F
1.0
1.1
1.2
1.3
1.4
1.5
-50
0
50
100
150
GROUND CURRENT (mA)
TEMPERATURE (
C)
Ground Current
vs. Temperature
I
LOAD
= 100mA
C
IN
= 2.2
F
C
OUT
= 4.7
F
-100
0
100
200
-5
0
5
10 15 20 25 30 35
LOAD (mA)
TIME (ms)
Thermal Regulation
(3.3V Version)
-50
0
50
100
OUTPUT (mV)
C
L
= 4.7
F
3.0
3.1
3.2
3.3
3.4
3.5
3.6
-60 -30
0
30
60
90 120 150
OUTPUT VOLTAGE (V)
TEMPERATURE (
C)
Output Voltage vs. Temp.
(3.3V Version)
C
IN
= 2.2
F
C
OUT
= 4.7
F
3 DEVICES:
HI / AVG / LO
CURVES APPLICABLE
AT 100
A AND 100mA
100
120
140
160
180
200
220
240
260
280
300
-60 -30
0
30
60
90 120 150
OUTPUT CURRENT (mA)
TEMPERATURE (
C)
Output Current
vs. Temperature
V
OUT
= 0V
(SHORT CIRCUIT)
V
OUT
= 3.3V
3.20
3.21
3.22
3.23
3.24
3.25
3.26
3.27
3.28
3.29
3.30
-60 -30
0
30
60
90 120 150
MIN. INPUT VOLTAGE (V)
TEMPERATURE (
C)
Minimum Input Voltage
vs. Temperature
C
IN
= 2.2
F
C
OUT
= 4.7
F
I
LOAD
= 1mA
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