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
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
Micrel, Inc.
MIC5203
Electrical Characteristics (continued)
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
IL
V
IH
I
IL
I
IH
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. 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.
4. Output voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range.
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.
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.
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.
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.
Parameter
Condition
Logic low (off)
Logic high (on)
V
IL
≤
0.6V
V
IH
≥
2.0V
Min
Typ
Max
0.6
Units
Enable Input
Enable input voltage level
Enable input current
2.0
0.01
15
1
50
V
μA
November 2009
5
M9999-111909
嵌入式系统
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