December 1998
3-141
MIC5203
Micrel
3
General Description
The MIC5203 is a
CapTM 80mA linear voltage regulator with
very low dropout voltage (typically 20mV at light loads and
300mV at 80mA) and very low ground current (225
A at
20mA output), offering better than 3% initial accuracy with a
logic-compatible enable input.
The
CapTM regulator design is optimized to work with low-
value, low-cost ceramic capacitors. The outputs typically
require only 0.47
F of output capacitance for stability.
Designed especially for hand-held, battery-powered devices,
the MIC5203 can be controlled by a CMOS or TTL compatible
logic signal. When disabled, power consumption drops nearly
to zero. If on-off control is not required, the enable pin may be
tied to the input for 3-terminal operation. The ground current
of the MIC5203 increases only slightly in dropout, further
prolonging battery life. Key MIC5203 features include current
limiting, overtemperature shutdown, and protection against
reversed battery.
The MIC5203 is available in 2.8V, 3.0V, 3.3V, 3.6V, 3.8V,
4.0V, 4.5V, 4.75V, and 5.0V fixed voltages. Other voltages
are available; contact Micrel for details.
Typical Applications
Enable
Shutdown
LAxx
V
OUT
0.47F
SOT-143 Version
1
5
2
3
4
0.47F
V
OUT
Enable
Shutdown
LKxx
SOT-23-5 Version
Ordering Information
Part Number
Marking
Voltage
Junction Temp. Range
Package
MIC5203-3.0BM4
LA30
3.0V
40
C to +125
C
SOT-143
MIC5203-3.3BM4
LA33
3.3V
40
C to +125
C
SOT-143
MIC5203-3.6BM4
LA36
3.6V
40
C to +125
C
SOT-143
MIC5203-3.8BM4
LA38
3.8V
40
C to +125
C
SOT-143
MIC5203-4.0BM4
LA40
4.0V
40
C to +125
C
SOT-143
MIC5203-4.5BM4
LA45
4.5V
40
C to +125
C
SOT-143
MIC5203-4.7BM4
LA47
4.75V
40
C to +125
C
SOT-143
MIC5203-5.0BM4
LA50
5.0V
40
C to +125
C
SOT-143
MIC5203-2.8BM5
LA28
2.8V
40
C to +125
C
SOT-23-5
MIC5203-3.0BM5
LK30
3.0V
40
C to +125
C
SOT-23-5
MIC5203-3.3BM5
LK33
3.3V
40
C to +125
C
SOT-23-5
MIC5203-3.6BM5
LK36
3.6V
40
C to +125
C
SOT-23-5
MIC5203-3.8BM5
LK38
3.8V
40
C to +125
C
SOT-23-5
MIC5203-4.0BM5
LK40
4.0V
40
C to +125
C
SOT-23-5
MIC5203-4.5BM5
LK45
4.5V
40
C to +125
C
SOT-23-5
MIC5203-4.7BM5
LK47
4.75V
40
C to +125
C
SOT-23-5
MIC5203-5.0BM5
LK50
5.0V
40
C to +125
C
SOT-23-5
Other voltages available. Contact Micrel for details.
Features
Tiny 4-lead and 5-lead surface-mount packages
Wide Selection of output voltages
Guaranteed 80mA output
Low quiescent current
Low dropout voltage
Tight load and line regulation
Low temperature coefficient
Current and thermal limiting
Reversed input polarity protection
Zero off-mode current
Logic-controlled shutdown
Stability with low-ESR ceramic capacitors
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
MIC5203
CapTM 80mA Low-Dropout Voltage Regulator
3-142
December 1998
MIC5203
Micrel
Absolute Maximum Ratings
(Note 1)
Input Supply Voltage (V
IN
) ............................ 20V to +20V
Enable Input Voltage (V
EN
) ........................... 20V to +20V
Power Dissipation (P
D
) ............................ Internally Limited
Storage Temperature Range (T
S
) ............ 60
C to +150
C
Lead Temperature (Soldering, 5 sec.) ...................... 260
C
Operating Ratings
(Note 2)
Input Voltage (V
IN
) ........................................... 2.5V to 16V
Enable Input Voltage (V
EN
) .................................. 0V to V
IN
Junction Temperature Range ................... 40
C to +125
C
Thermal Resistance
(
JA
) ......................................... Note 3
Pin Configuration
GND
OUT
IN
EN
LAxx
Part
Identification
1
2
3
4
SOT-143 (M4)
IN
OUT
NC
EN
LKxx
1
3
4
5
2
GND
SOT-23-5 (M5)
Pin Description
Pin Number
Pin Number
Pin Name
Pin Function
SOT-143
SOT-23-5
1
2
GND
Ground
2
3
EN
Enable (Input): TTL/CMOS compatible control input. Logic high = enabled;
logic low or open = shutdown.
3
1
IN
Supply Input
4
NC
Not internally connected.
4
5
OUT
Regulator Output
December 1998
3-143
MIC5203
Micrel
3
Electrical Characteristics
V
IN
= V
OUT
+ 1V; I
L
= 1mA; C
L
= 0.47
F; V
EN
2.0V; T
J
= 25
C, bold values indicate 40
C
T
J
+125
C; unless noted.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
O
Output Voltage Accuracy
3
3
%
4
4
%
V
O
/
T
Output Voltage Temp. Coefficient
Note 4
50
200
ppm/
C
V
O
/V
O
Line Regulation
V
IN
= V
OUT
+ 1V to 16V
0.008
0.3
%
0.5
%
V
O
/V
O
Load Regulation
I
L
= 0.1mA to 80mA, Note 5
0.08
0.3
%
0.5
%
V
IN
V
O
Dropout Voltage, Note 6
I
L
= 100
A
20
mV
I
L
= 20mA
200
350
mV
I
L
= 50mA
250
mV
I
L
= 80mA
300
600
mV
I
Q
Quiescent Current
V
EN
0.4V (shutdown)
0.01
10
A
I
GND
Ground Pin Current, Note 7
I
L
= 100
A, V
EN
2.0V (active)
180
A
I
L
= 20mA, V
EN
2.0V (active)
225
750
A
I
L
= 50mA, V
EN
2.0V (active)
850
A
I
L
= 80mA, V
EN
2.0V (active)
1800
3000
A
I
GNDDO
Ground Pin Current at Dropout
V
IN
= V
OUT(nominal)
0.5V, Note 7
200
300
A
I
LIMIT
Current Limit
V
OUT
= 0V
180
250
mA
V
O/
P
D
Thermal Regulation
Note 8
0.05
%/W
Enable Input
V
IL
Enable Input Voltage Level
logic Low (off)
0.6
A
V
IH
logic high (on)
2.0
A
I
IL
Enable Input Current
V
IL
0.6V
0.01
1
A
I
IH
V
IH
2.0V
15
50
A
Note 1.
Exceeding the absolute maximum rating may damage the device.
Note 2.
The device is not guaranteed to function outside its operating rating.
Note 3:
The maximum allowable power dissipation at any T
A
(ambient temperature) is P
D(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
JA
is 250
C/W for
the SOT-143 and 220
C/W for the SOT-23-5 mounted on a printed circuit board.
Note 4:
Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 5:
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 150mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
Note 6:
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 7:
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 8:
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 150mA load pulse at V
IN
= 16V for t = 10ms.
3-144
December 1998
MIC5203
Micrel
1
10
100
1000
0.01
0.1
1
10
100
DROPOUT VOLTAGE (mV)
OUTPUT CURRENT (mA)
Dropout Voltage
vs. Output Current
C
IN
= 10
F
C
OUT
= 1
F
0
100
200
300
400
-60 -30
0
30
60
90 120 150
DROPOUT VOLTAGE (mV)
TEMPERATURE (
C)
Dropout Voltage
vs. Temperature
C
IN
= 10
F
C
OUT
= 1
F
I
L
= 100
A
I
L
= 1mA
I
L
= 80mA
0
1
2
3
4
0
1
2
3
4
5
6
7
OUTPUT VOLTAGE (V)
SUPPLY VOLTAGE (V)
Dropout
Characteristics
I
L
= 80mA
I
L
= 100
A
C
IN
= 10
F
C
OUT
= 1
F
0
500
1000
1500
2000
0
10 20 30 40 50 60 70 80
GROUND CURRENT (
A)
OUTPUT CURRENT (mA)
Ground Current
vs. Output Current
V
IN
= V
OUT
+ 1V
0.0
0.5
1.0
1.5
2.0
0
1
2
3
4
5
6
7
GROUND CURRENT (mA)
SUPPLY VOLTAGE (V)
Ground Current
vs. Supply Voltage
I
L
= 50mA
I
L
= 100
A
V
OUT
= 3.3V
0.0
0.5
1.0
1.5
2.0
2.5
3.0
-60 -30
0
30
60
90 120 150
GROUND CURRENT (mA)
TEMPERATURE (
C)
Ground Current
vs. Temperature
I
L
= 50mA
I
L
= 100
A
C
IN
= 10
F
C
OUT
= 1
F
I
L
= 80mA
Typical Characteristics
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
50
100
150
200
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
C
IN
= 10
F
C
OUT
= 1
F
Output Voltage
vs. Output Current
0
20
40
60
80
100
120
140
160
0
1
2
3
4
5
6
7
SHORT CIRCUIT CURRENT (mA)
INPUT VOLTAGE (V)
Short Circuit Current
vs. Input Voltage
C
IN
= 10
F
C
OUT
= 1
F
-60
-40
-20
0
20
40
60
OUTPUT (mV)
-50
0
50
100
-2
0
2
4
6
8 10 12 14 16
LOAD (mA)
TIME (ms)
Thermal Regulation
(3.3V Version)
C
L
= 1
F
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
-60 -30
0
30
60
90 120 150
OUTPUT VOLTAGE (V)
TEMPERATURE (
C)
Output Voltage
vs. Temperature
C
IN
= 10
F
C
OUT
= 1
F
CURVES APPLICABLE
AT 100
A AND 50mA
3 DEVICES
HI / AVG / LO
100
120
140
160
180
200
-60 -30
0
30
60
90 120 150
OUTPUT CURRENT (mA)
TEMPERATURE (
C)
Short Circuit Current
vs. Temperature
C
IN
= 10
F
C
OUT
= 1
F
3.3
3.4
3.5
-60 -30
0
30
60
90 120 150
MIN. SUPPLY VOLTAGE (V)
TEMPERATURE (
C)
Minimum Supply Voltage
vs. Temperature
I
L
= 1mA
V
OUT
= 3.3V
C
IN
= 10
F
C
OUT
= 1
F
December 1998
3-145
MIC5203
Micrel
3
-400
-200
0
200
OUTPUT (mV)
0
200
-1
0
1
2
3
4
5
6
7
8
OUTPUT (mA)
TIME (ms)
Load Transient
C
OUT
= 0.1
F
V
IN
= V
OUT
+ 1
-400
-200
0
200
OUTPUT (mV)
-50
0
50
100
-1
0
1
2
3
4
5
6
7
8
OUTPUT (mA)
TIME (ms)
Load Transient
C
OUT
= 1
F
V
IN
= V
OUT
+ 1
-50
0
50
100
-5
0
5
10
15
20
OUTPUT (mA)
TIME (ms)
-200
-100
0
100
OUTPUT (mV)
Load Transient
C
OUT
= 10
F
V
IN
= V
OUT
+ 1
-2
-1
0
1
2
3
OUTPUT (V)
2
4
6
8
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
INPUT (V)
TIME (ms)
Line Transient
C
L
= 1
F
I
L
= 1mA
-1
0
1
2
OUTPUT (V)
2
4
6
8
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
INPUT (V)
TIME (ms)
Line Transient
C
L
= 11
F
I
L
= 1mA
0
20
40
60
80
100
10x10
0
100x10
0
1x10
3
10x10
3
100x10
3
1x10
6
RIPPLE VOLTAGE (dB)
FREQUENCY (Hz)
Ripple Voltage
vs. Frequency
I
L
= 1mA
C
L
= 0.1
F
V
IN
= V
OUT
+ 1
0
20
40
60
80
100
10x10
0
100x10
0
1x10
3
10x10
3
100x10
3
1x10
6
RIPPLE VOLTAGE (dB)
FREQUENCY (Hz)
Ripple Voltage
vs. Frequency
I
L
= 50mA
C
L
= 0.1
F
V
IN
= V
OUT
+ 1
0
20
40
60
80
100
10x10
0
100x10
0
1x10
3
10x10
3
100x10
3
1x10
6
RIPPLE VOLTAGE (dB)
FREQUENCY (Hz)
Ripple Voltage
vs. Frequency
I
L
= 1mA
C
L
= 1
F
V
IN
= V
OUT
+ 1
0
20
40
60
80
100
10x10
0
100x10
0
1x10
3
10x10
3
100x10
3
1x10
6
RIPPLE VOLTAGE (dB)
FREQUENCY (Hz)
Ripple Voltage
vs. Frequency
I
L
= 50mA
C
L
= 1
F
V
IN
= V
OUT
+ 1
-2
-1
0
1
2
3
OUTPUT (V)
-2
-1
0
1
2
3
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
INPUT (V)
TIME (ms)
Line Transient
C
L
= 0.1
F
I
L
= 1mA
0
20
40
60
80
100
10x10
0
100x10
0
1x10
3
10x10
3
100x10
3
1x10
6
RIPPLE VOLTAGE (dB)
FREQUENCY (Hz)
Ripple Voltage
vs. Frequency
I
L
= 100
A
C
L
= 0.1
F
V
IN
= V
OUT
+ 1
0
20
40
60
80
100
10x10
0
100x10
0
1x10
3
10x10
3
100x10
3
1x10
6
RIPPLE VOLTAGE (dB)
FREQUENCY (Hz)
Ripple Voltage
vs. Frequency
I
L
= 100
A
C
L
= 1
F
V
IN
= V
OUT
+ 1
Awaiting Further
Characterization
Data
Awaiting Further
Characterization
Data
Awaiting Further
Characterization
Data
Awaiting Further
Characterization
Data
Awaiting Further
Characterization
Data
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