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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.
TheµCap 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 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.
Data sheets and support documentation can be found on
Micrel’s web site at
www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
Tiny 4- and 5-lead surface-mount packages
Wide selection of output voltages
Guaranteed 80mA output
Low quiescent current
Low dropout voltage
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
Barcode scanners
SMPS post-regulator/DC-to-DC modules
High-efficiency linear power supplies
_________________________________________________________________________________________________________________________
Typical Application
Enable
Shutdow
n
LAxx
V
OUT
0.47µF
Enable
Shutdow
n
1
2
3
5
V
OUT
0.47µF
4
SOT-143 Version
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
November 2009
M9999-111909
Micrel, Inc.
MIC5203
Ordering Information
(1)
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
Note:
1. Other Voltage available. Contact Micrel for details.
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
4.7V
5.0V
2.6V
2.8V
3.0V
3.3V
3.6V
3.8V
4.0V
4.5V
4.7V
5.0V
Temperature Range
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
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
November 2009
2
M9999-111909
Micrel, Inc.
MIC5203
Pin Configuration
EN
2
GND
1
E N GND IN
3
2
1
Part
Identification
3
LAxx
4
LKxx
4
5
IN
OUT
NC
OUT
SOT-143 (M4)
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 Name
Ground.
Enable (Input): TTL/CMOS compatible control input. Logic high =
enabled; logic low or open = shutdown.
Supply input.
Not internally connected.
Regulator output.
November 2009
3
M9999-111909
Micrel, Inc.
MIC5203
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ....................................... –20V to +20V
Enable Input Voltage (V
EN
)............................. –20V to +20V
Power Dissipation (P
D
) ..............................Internally Limited
Storage Temperature (Ts).........................–60°C to +150°C
Lead Temperature (soldering, #sec.)......................... 260°C
Operating Ratings
(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
∆V
O
/∆T
∆V
O
/V
O
∆V
O
/V
O
Parameter
Output voltage accuracy
Output voltage temperature
coefficient
Line regulation
Load regulation
Note 4
V
IN
= V
OUT
+ 1V to 16V
I
L
= 0.1mA to 80mA
(5)
I
L
= 100
μA
∆V
O
– V
O
Dropout voltage
(6)
I
L
= 20mA
I
L
= 50mA
I
L
= 80mA
I
Q
Quiescent current
V
EN
≤
0.4V (shutdown)
I
L
= 100
μA,
V
EN
≥
2.0V (active)
I
GND
Ground pin current
(7)
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
∆V
O/
∆P
D
Ground pin current at dropout
Current limit
Thermal regulation
V
IN
= V
OUT(nominal)
– 0.5V
(7)
V
OUT
= 0V
Note 8
Condition
Min
–3
–4
50
0.008
0.08
20
200
250
300
0.01
180
225
850
1800
200
180
0.05
3000
300
250
μA
mA
%/W
750
μA
600
10
μA
350
mV
Typ
Max
3
4
200
0.3
0.5
0.3
0.5
Units
%
pm/°C
%
%
November 2009
4
M9999-111909
能源基础设施
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