MIC5203
Micrel, Inc.
MIC5203
µCap 80mA Low-Dropout Regulator
General Description
The MIC5203 is a µCap 80mA linear voltage regulator with
very low dropout voltage (typically 20mV at light loads and
300mV at 80mA) and very low ground current (225µA at
20mA output), offering better than 3% initial accuracy with a
logic-compatible enable input.
The µCap regulator design is optimized to work with low-value,
low-cost ceramic capacitors. The outputs typically require
only 0.47µF of output capacitance for stability.
Designed especially for hand-held, battery-powered devices,
the MIC5203 can be controlled by a CMOS or TTL compat-
ible 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.
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
Typical Applications
Enable
Shutdow
n
1
5
LAxx
V
OUT
0.47µF
SOT-143 Version
Enable
Shutdown
2
3
4
V
OUT
0.47µF
SOT-23-5 Version
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
February 2009
1
MIC5203
MIC5203
Micrel, Inc.
Ordering Information
Part Number
Standard
MIC5203-2.6BM4
MIC5203-2.8BM4
MIC5203-3.0BM4
MIC5203-3.3BM4
MIC5203-3.6BM4
MIC5203-3.8BM4
MIC5203-4.0BM4
MIC5203-4.5BM4
MIC5203-4.7BM4
MIC5203-5.0BM4
MIC5203-2.6BM5
MIC5203-2.8BM5
MIC5203-3.0BM5
MIC5203-3.3BM5
MIC5203-3.6BM5
MIC5203-3.8BM5
MIC5203-4.0BM5
MIC5203-4.5BM5
MIC5203-4.7BM5
MIC5203-5.0BM5
Marking
LA26
LA28
LA30
LA33
LA36
LA38
LA40
LA45
LA47
LA50
LK26
LK28
LK30
LK33
LK36
LK38
LK40
LK45
LK47
LK50
Pb-Free
MIC5203-2.6YM4
MIC5203-2.8YM4
MIC5203-3.0YM4
MIC5203-3.3YM4
MIC5203-3.6YM4
MIC5203-3.8YM4
MIC5203-4.0YM4
MIC5203-4.5YM4
MIC5203-4.7YM4
MIC5203-5.0YM4
MIC5203-2.6YM5
MIC5203-2.8YM5
MIC5203-3.0YM5
MIC5203-3.3YM5
MIC5203-3.6YM5
MIC5203-3.8YM5
MIC5203-4.0YM5
MIC5203-4.5YM5
MIC5203-4.7YM5
MIC5203-5.0YM5
Marking
LA26
LA28
LA30
LA33
LA36
LA38
LA40
LA45
LA47
LA50
LK26
LK28
LK30
LK33
LK36
LK38
LK40
LK45
LK47
LK50
Voltage
2.6V
2.8V
3.0V
3.3V
3.6V
3.8V
4.0V
4.5V
4.75V
5.0V
2.6V
2.8V
3.0V
3.3V
3.6V
3.8V
4.0V
4.5V
4.7V
5.0V
Temperature Range
-40ºC to +125ºC
-40ºC to +125ºC
-40ºC to +125ºC
-40ºC to +125ºC
-40ºC to +125ºC
-40ºC to +125ºC
-40ºC to +125ºC
-40ºC to +125ºC
-40ºC to +125ºC
-40ºC to +125ºC
-40ºC to +125ºC
-40ºC to +125ºC
-40ºC 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-143
SOT-143
SOT-143
SOT-143
SOT-143
SOT-143
SOT-143
SOT-143
SOT-143
SOT-143
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
Other voltages available, please contact Micrel Marketing.
Pin Configuration
EN
Part
Identification
2
GND
1
E N GND IN
3
2
1
LAxx
3
4
LKxx
4
5
IN
SOT-143 (M4)
OUT
NC
OUT
SOT-23-5 (M5)
Pin Description
Pin Number
SOT-143
1
2
3
4
Pin Number
SOT-23-5
2
3
1
4
5
Pin Name
GND
EN
IN
NC
OUT
Pin Function
Ground
Enable (Input): TTL/CMOS compatible control input. Logic high = enabled;
logic low or open = shutdown.
Supply Input
Not internally connected.
Regulator Output
MIC5203
2
February 2009
MIC5203
Micrel, Inc.
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
(θ
JA
) ..........................................
Note 3
Electrical Characteristics
V
IN
= V
OUT
+ 1V; I
L
= 1mA; C
L
= 0.47µF; V
EN
≥ 2.0V; T
J
= 25°C,
bold
values indicate –40°C ≤ T
J
≤ +125°C; unless noted.
Symbol
V
O
ΔV
O
/ΔT
ΔV
O
/V
O
ΔV
O
/V
O
V
IN
–V
O
Parameter
Output Voltage Accuracy
Output Voltage Temp. Coefficient
Line Regulation
Load Regulation
Dropout Voltage,
Note 6
Note 4
V
IN
= V
OUT
+ 1V to 16V
I
L
= 0.1mA to 80mA,
Note 5
I
L
= 100µA
I
L
= 20mA
I
L
= 50mA
I
L
= 80mA
I
Q
I
GND
Quiescent Current
Ground Pin Current,
Note 7
V
EN
≤ 0.4V (shutdown)
I
L
= 100µA, V
EN
≥ 2.0V (active)
I
L
= 20mA, V
EN
≥ 2.0V (active)
I
L
= 50mA, V
EN
≥ 2.0V (active)
I
L
= 80mA, V
EN
≥ 2.0V (active)
I
GNDDO
I
LIMIT
ΔV
O/
ΔP
D
Enable Input
V
IL
V
IH
I
IL
I
IH
Note 1.
Note 2.
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Conditions
Min
–3
–4
Typ
Max
3
4
Units
%
%
pm/°C
%
%
%
%
mV
mV
mV
mV
µA
µA
µA
µA
µA
µA
mA
%/W
50
0.008
0.08
20
200
250
300
0.01
180
225
850
1800
200
180
0.05
200
0.3
0.5
0.3
0.5
350
600
10
750
3000
300
250
Ground Pin Current at Dropout
Current Limit
Thermal Regulation
Enable Input Voltage Level
Enable Input Current
V
IN
= V
OUT(nominal)
– 0.5V,
Note 7
V
OUT
= 0V
Note 8
logic Low (off)
logic high (on)
V
IL
≤ 0.6V
V
IH
≥ 2.0V
2.0
0.6
0.01
15
1
50
µA
µA
µA
µA
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
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 250°C/W for the SOT-143
and 220°C/W for the SOT-23-5 mounted on a printed circuit 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. 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.
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 150mA load pulse at V
IN
= 16V for t = 10ms.
February 2009
3
MIC5203
MIC5203
Micrel, Inc.
Typical Characteristics
Dropout Voltage
vs. Output Current
D
R
O
P
OUT VOLTA
G
E (mV)
1000
D
R
O
P
OUT VOLTA
G
E (mV)
OUT
P
UT VOLTA
G
E (V)
C
IN
= 10µF
C
OUT
= 1µF
400
300
200
100
Dropout Voltage
vs. Temperature
C
IN
= 10µF
C
OUT
= 1µF
I
L
= 80mA
4
3
2
1
0
Dropout
Characteristics
I
L
= 100µA
I
L
= 80mA
C
IN
= 10µF
C
OUT
= 1µF
0
1
2
3
4 5 6
SUPPLY VOLTAGE (V)
7
100
10
I
L
= 1mA
I
L
= 100µA
1
0.01
0.1
1
10
100
OUTPUT CURRENT (mA)
0
-60 -30 0 30 60 90 120 150
TEMPERATURE
°C)
(
2000
GR
OU
N
D CU
RR
E
N
T (
µ
A)
1500
1000
500
0
Ground Current
vs. Output Current
GR
OU
N
D CU
RR
E
N
T (mA)
2.0
1.5
Ground Current
vs. Supply Voltage
GR
OU
N
D CU
RR
E
N
T (mA)
3.0
2.5
2.0
1.5
1.0
0.5
Ground Current
vs. Temperature
C
IN
= 10µF
C
OUT
= 1µF
I
L
= 50mA
I
L
= 100µA
V
OUT
= 3.3V
I
L
= 80mA
1.0
0.5
0.0
0
I
L
= 50mA
I
L
= 100µA
V
IN
= V
OUT
+ 1V
0 10 20 30 40 50 60 70 80
OUTPUT CURRENT (mA)
1
2
3
4 5 6
SUPPLY VOLTAGE (V)
7
0.0
-60 -30 0 30 60 90 120 150
TEMPERATURE
°C)
(
S
H
O
R
T CI
R
CUIT CU
RR
E
N
T (mA)
OUT
P
UT VOLTA
G
E (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
140
120
100
80
60
40
20
0
0
1
C
IN
= 10µF
C
OUT
= 1µF
2
3
4 5 6
INPUT VOLTAGE (V)
7
LOAD (mA)
∆
OUT
P
UT (mV)
4.0
Output Voltage
vs. Output Current
160
Short Circuit Current
vs. Input Voltage
60
40
20
0
-20
-40
-60
100
50
0
Thermal Regulation
(3.3V Version)
-50
-2
0
C
L
= 1µF
2
4 6 8 10 12 14 16
TIME (ms)
4.0
Output Voltage
vs. Temperature
OUT
P
UT CU
RR
E
N
T (mA)
C
IN
= 10µF
C
OUT
= 1µF
200
180
160
140
120
Short Circuit Current
vs. Temperature
MI
N
. SU
PP
LY VOLTA
G
E (V)
3.5
Minimum Supply Voltage
vs. Temperature
OUT
P
UT VOLTA
G
E (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
3.4
I
L
= 1mA
VOUT
= 3.3V
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)
(
MIC5203
4
February 2009
MIC5203
Micrel, Inc.
OUT
P
UT (mA)
∆
OUT
P
UT (mV)
OUT
P
UT (mA)
∆
OUT
P
UT (mV)
0
-200
-400
100
50
0
-50
-1
0
1
2 3 4 5
TIME (ms)
6 7
8
C
OUT
= 1µF
V
IN
= V
OUT
+ 1
0
-100
-200
100
50
0
-50
-5
0
5
10
TIME (ms)
15
20
C
OUT
= 10µF
V
IN
= V
OUT
+ 1
I
NP
UT (V)
∆
OUT
P
UT (V)
200
Load Transient
100
Load Transient
3
2
1
0
-1
8
-2
6
4
Line Transient
C
L
= 1µF
I
L
= 1mA
2
-0.2
0.0
0.2 0.4 0.6
TIME (ms)
0.8
1.0
∆
OUT
P
UT (V)
2
1
0
-1
8
6
4
Line Transient
R
I
PP
LE VOLTA
G
E (d
B
)
C
L
= 11µF
I
L
= 1mA
100
80
60
40
20
0
Ripple Voltage
vs. Frequency
R
I
PP
LE VOLTA
G
E (d
B
)
100
80
60
40
20
0
Ripple Voltage
vs. Frequency
I
NP
UT (V)
I
L
= 100µA
C
L
= 1µF
V
IN
= V
OUT
+ 1
I
L
= 1mA
C
L
= 1µF
V
IN
= V
OUT
+ 1
100
x
10
0
10
x
10
3
1
x
10
3
100
x
10
3
1
x
10
6
100
x
10
0
10
x
10
3
100
x
10
3
10
x
10
0
1
x
10
3
1
x
10
6
10
x
10
0
2
-0.2
0.0
0.2 0.4 0.6
TIME (ms)
0.8
1.0
FREQUENCY (Hz)
FREQUENCY (Hz)
100
R
I
PP
LE VOLTA
G
E (d
B
)
Ripple Voltage
vs. Frequency
1000
Output Impedance
OUT
P
UT (V)
80
60
40
20
0
I
L
= 50mA
C
L
= 1µF
V
IN
= V
OUT
+ 1
100
x
10
0
1
x
10
3
10
x
10
3
100
x
10
3
1
x
10
6
OUT
P
UT IM
P
EDA
N
CE (
Ω)
100
10
1
0.1
I
L
= 100µA
I
L
= 1mA
5
4
3
2
1
0
4
-1
2
0
Enable Characteristics
(3.3V Version)
C
L
= 1µF
I
L
= 100µA
I
L
= 100mA
E
N
A
B
LE (V)
0
10
x
10
0
100
x
10
0
FREQUENCY (Hz)
FREQUENCY (Hz)
E
N
A
B
LE VOLTA
G
E (mV)
C
L
= 1µF
I
L
= 100µA
1.25
1.00
V
OFF
0.75
E
N
A
B
LE CU
RR
E
N
T (
µ
A)
4.0
3.0
2.0
1.0
0.0
4
-1.0
2
0
-2
-2
Enable Characteristics
(3.3V Version)
1.50
Enable Voltage
vs. Temperature
C
IN
= 10µF
C
OUT
= 1µF
I
L
= 1mA
100
x
10
3
10
x
10
10
x
10
1
x
10
6
1
x
10
0
3
1
x
10
3
0.01
-2
-0.2
0.0
0.2 0.4 0.6
TIME (ms)
0.8
1.0
40
30
20
10
Enable Current
vs. Temperature
C
IN
= 10µF
C
OUT
= 1µF
I
L
= 1mA
V
EN
= 5V
V
EN
= 2V
OUT
P
UT (V)
E
N
A
B
LE (V)
V
ON
0
2
4
6
TIME (µs)
8
10
0.50
-60 -30 0 30 60 90 120 150
TEMPERATURE
°C)
(
0
-60 -30 0 30 60 90 120 150
TEMPERATURE
°C)
(
February 2009
5
MIC5203
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