MIC5225
Ultra-Low Quiescent Current
150mA µCap Low Dropout Regulator
General Description
The MIC5225 is a 150mA highly accurate, low dropout
regulator with high input voltage and ultra-low ground
current. This combination of high voltage and low ground
current makes the MIC5225 ideal for a wide variety of
applications including USB and portable electronics
applications, using 1-cell, 2-cell or 3-cell Li-Ion battery
inputs.
A µCap LDO design, the MIC5225 is stable with either a
ceramic or tantalum output capacitor. It only requires a
2.2µF capacitor for stability.
Features of the MIC5225 includes enable input, thermal
shutdown, current limit, reverse battery protection, and
reverse leakage protection.
Available in fixed and adjustable output voltage versions,
the MIC5225 is offered in the IttyBitty
®
SOT23-5 package
with a junction temperature range of –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
•
Wide input voltage range: 2.3V to 16V
High output accuracy of ±2.0% over temperature
Guaranteed 150mA output
Very low ground current: 29µA
Low dropout voltage of 310mV at 150mA
µCap: Stable with ceramic or tantalum capacitors
Excellent line and load regulation specifications
Reverse battery protection
Reverse leakage protection
Zero shutdown current
Thermal shutdown and current limit protection
IttyBitty
®
SOT23-5 Package
Applications
•
Cellular phones
•
Keep alive supply in notebook and portable computers
•
Battery-powered equipment
•
Consumer/personal electronics
•
High-efficiency linear power supplies
•
Automotive electronics
_______________________________________________________________________________________________________
Typical Application
MIC5225YM5
1
2
5
V
IN
C
IN
= 1.0µF
OFF ON
EN
V
OUT
= 1.8V
R
1
R
2
C
OUT
= 2.2µF
ceramic
I
GND
= 18µA
40
38
36
34
32
30
28
26
24
22
Ground Pin Current
vs. Input Voltage
3
4
I
OUT
= 1mA
I
OUT
= 100µA
I
OUT
= 10µA
Ultra-Low Current Adjustable Regulator Application
20
4
6
8
10 12 14
INPUT VOLTAGE (V)
16
IttyBitty is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
July 2008
M9999-072908-A
Micrel, Inc.
MIC5225
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) .................................. ……–20V to 18V
Enable Voltage (V
EN
)....................................... –0.3V to 18V
Power Dissipation (P
D
) ..............................Internally Limited
Junction Temperature (T
J
) ........................–40°C to +125°C
Storage Temperature (T
s
) .........................–65°C to +150°C
ESD ...........................................................................
Note 3
Operating Ratings
(2)
Supply Voltage (V
IN
).......................................... 2.3V to 16V
Enable Voltage (V
EN
)............................................ 0V to 16V
Junction Temperature (T
J
) ........................ –40°C to +125°C
Package Thermal Resistance
SOT23-5 (θ
JA
) ..................................................235°C/W
Electrical Characteristics
(4)
T
A
= 25°C with V
IN
= V
OUT
+ 1V; Load = 100µA;
bold
values indicate –40°C< T
J
< +125°C, unless otherwise specified.
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage
Reference Voltage
Load = 100µA
Ground Current
Ground Current in Shutdown
Short Circuit Current
Output Leakage,
Reverse Polarity Input
Enable Input
Input Low Voltage
Input High Voltage
Enable Input Current
Regulator OFF
Regulator ON
V
EN
= 0.6V; Regulator OFF
V
EN
= 2.0V; Regulator ON
V
EN
= 16V; Regulator ON
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
Condition
Variation from nominal V
OUT
V
IN
= V
OUT
+ 1V to 16V
Load = 100µA to 150mA
Load = 100µA
Load = 50mA
Load = 150mA
Min
–1.0
–2.0
Typ
Max
+1.0
+2.0
Units
%
%
%
%
mV
mV
mV
µA
mA
mA
µA
mA
µA
0.04
0.25
50
230
310
1.22
1.24
29
0.5
3
0.1
300
–0.1
300
450
1.26
50
0.9
5
5
500
1
Load = 50mA
Load = 150mA
V
EN
< 0.6V; V
IN
= 16V
V
OUT
= 0V
Load = 500Ω; V
IN
= -15V
0.6
2.0
–1.0
0.01
0.15
0.5
+1.0
1.0
2.5
V
V
µA
µA
µA
July 2008
3
M9999-072908-A
嵌入式系统
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