MIC5232
10mA Ultra-Low Quiescent Current
µCap LDO
General Description
The MIC5232 is an ultra-low quiescent current, low-
dropout linear regulator that is capable of operating
from a single-cell lithium ion battery. Consuming only
1.8
µ
A of quiescent current while operating, the
MIC5232 is ideal for stand-by applications like
powering real-time clocks or memory in battery
operated electronics.
The MIC5232 is capable of providing 10mA of output
current and has low output noise, providing a small,
efficient solution ideal for any keep-alive application.
This includes reverse current protection, keeping
reverse leakage (V
OUT
> V
IN
) down to 20nA.
The MIC5232 is a µCap design, operating with very
small ceramic output capacitors for stability, reduction
of required board space and component cost.
The MIC5232 is available in fixed output voltages in
the miniature 6-pin 2mm x 2mm MLF
®
package and
thin SOT-23-5 package with an operating junction
temperature range of -40°C to 125°C.
Features
Input voltage range: 2.7V to 7.0V
Ultra-low Iq: Only 1.8
µ
A operating current
Stable with 0.47µF ceramic output capacitor
Low dropout voltage of 100mV @ 10mA
Reverse Battery Protection
High output accuracy:
– +2.0% initial accuracy
– +3.0% over temperature
Logic-Level Enable Input
Miniature 6-pin 2mm x 2mm MLF package
Lead-Free Thin SOT-23-5 Package
Tight Load and Line Regulation
Applications
Real-Time Clock Power Supply
Stand-by Power Supply
SRAM Memory Back-up Supply
Cellular Telephones and Notebook Computers
Typical Application
MIC5232-1.2YD5
V
IN
3.6V
1µF
3.0
2.7
2.4
2.1
1.8
1.5
1.2
0.9
0.6
0.3
V
OUT
= 1.2V
I
OUT
= 100µA
C
OUT
= 0.47µF
Ground Pin Current
vs. Input Voltage
VIN
EN
VOUT
V
OUT
1.2V
0.47µF
ceramic
GND
1.5 Real-Time Clock Back-up Supply
0
2.5 3 3.5 4 4.5 5 5.5 6 6.5 7
INPUT VOLTAGE (V)
MLF and
MicroLeadFrame
are registered trademarks of Amkor Technology, 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
June 2012
M9999-061812-C
Micrel, Inc.
MIC5232
Ordering Information
Part Number
MIC5232-1.2YD5
MIC5232-1.8YD5
MIC5232-2.5YD5
MIC5232-2.8YD5
MIC5232-3.3YD5
MIC5232-1.2YML
MIC5232-1.8YML
MIC5232-2.5YML
MIC5232-2.8YML
MIC5232-3.3YML
Notes:
1. Overbar/Underbar symbol (
/ __ ) may not be to scale.
Marking
Code
(1)
ZA12
ZA18
ZA25
ZA28
ZA33
12Z
18Z
25Z
28Z
33Z
Voltage
(2)
1.2V
1.8V
2.5V
2.8V
3.3V
1.2V
1.8V
2.5V
2.8V
3.3V
Junction
Temperature Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
TSOT-23-5
TSOT-23-5
TSOT-23-5
TSOT-23-5
TSOT-23-5
6-Pin 2mm x 2mm MLF
(3)
6-Pin 2mm x 2mm MLF
(3)
6-Pin 2mm x 2mm MLF
6-Pin 2mm x 2mm MLF
(3)
(3)
Lead Finish
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
6-Pin 2mm x 2mm MLF
(3)
2. Other voltages available. Contact Micrel Inc. for more details.
3. MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
.
June 2012
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M9999-061812-C
Micrel, Inc.
MIC5232
Pin Configuration
Pin Description
Pin Number
TSOT-23-5
1
2
3
4
5
-
-
Pin Number
MLF
3
2
1
5
4
6
EP
Pin Name
VIN
GND
EN
NC
VOUT
NC
ePad
Pin Name
Supply Input.
Ground.
Enable Input. Active High. High = on, Low = off. Do not leave floating.
Not Internally Connected.
Output (10mA output current).
Not Internally Connected.
Exposed pad connected-to-ground.
Block Diagram
June 2012
3
M9999-061812-C
Micrel, Inc.
MIC5232
Absolute Maximum Ratings
(1)
Supply Input Voltage (V
IN
) ................................0V to 8V
Enable Input Voltage (V
EN
)...............................0V to 8V
Power Dissipation (P
D
) .................... Internally Limited
(3)
Junction Temperature (T
J
).................. –40°C to +125°C
Storage Temperature (T
S
) .................. –65°C to +150°C
Lead Temperature (soldering, 5 sec.) ................. 260°C
ESD Rating
(4)
......................................................... ±2kV
Operating Ratings
(2)
Supply voltage (V
IN
) ...................................... 2.7V to 7V
Enable Input voltage (V
EN
) ...............................0V to V
IN
Thermal Resistance
TSOT-23-5 (θ
JA
)......................................... 235°C/W
MLF-6 (θ
JA
) .................................................. 90°C/W
Electrical Characteristics
(5)
V
IN
= V
OUT
+ 1.0V, C
OUT
= 0.47µF, I
OUT
= 100µA, T
J
= 25°C,
bold
values indicate –40°C to +125°C, unless noted.
Parameter
Output Voltage Accuracy
Output Voltage Temp. Coefficient
Line Regulation
Load Regulation
Dropout Voltage
(6)
Ground Pin Current
Ground Pin Current in Shutdown
Current Limit
Reverse Current (V
OUT
> V
IN
)
Ripple Rejection
Output Voltage Noise
Enable Input
Enable Input Voltage
Enable Input Current
Turn-on Time
(7)
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 of 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.
4. Devices are ESD sensitive. Handling precautions recommended.
5. Specification for packaged product only.
6. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal V
OUT
. For outputs below
2.7V, dropout voltage is the input-to-output differential with the minimum input voltage 2.7V.
7. Turn-on time is measured from 10% of the positive edge of the enable signal to 90% of the rising edge of the output voltage of the regulator.
Conditions
Variation from nominal V
OUT
Variation from nominal V
OUT
; -40C to +125C
V
IN
= V
OUT
+1V to7V;
I
OUT
= 10µA to 10mA
I
OUT
= 100µA
I
OUT
= 10mA
I
OUT
= 10µA
V
EN
< 0.18V
V
OUT
= 0V
V
OUT
= V
IN
+ 1V
f = 10Hz
f = 1kHz
C
OUT
=0.47µF; 10Hz to 100kHz
Logic Low (Regulator Shutdown)
Logic High (Regulator Enabled)
VIL < 0.18V (Regulator Shutdown)
VIH > 1.4V (Regulator Enabled)
C
OUT
= 0.47µF
Min
-2.0
-3.0
Typ
Max
+2.0
+3.0
0.25
1.0
1.5
300
3
1.5
120
1
40
0.02
0.2
60
100
1.8
0.1
70
0.02
55
35
400
Units
%
%
ppm/C
%/V
%
%
mV
mV
µA
µA
mA
µA
dB
dB
µVrms
V
V
nA
nA
ms
0.18
1.4
1
1
0.75
1.5
June 2012
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M9999-061812-C
Micrel, Inc.
MIC5232
Typical Characteristics
Ripple Rejection
80
Dropout Voltage vs.
Output Current
120
Dropout Voltage
vs. Temperature
90
DROPOUT VOLTAGE (mV)
100
80
60
40
20
0
DROPOUT VOLTAGE (mV)
70
60
80
70
60
50
40
30
20
10
0
V
OUT
=3.3V
I
OUT
=100µA
C
OUT
=0.47µF
PSRR (dB)
50
40
30
20
10
0
0.01
V
OUT
=3.3V
V
IN
=V
OUT
+1V
I
OUT
=100µA
C
OUT
=.47µF
0.1
1
10
100
1000
10000
V
OUT
= 3.3V
C
OUT
= 0.47µF
0
1
2
3
4
5
6
7
8
9
10
-40
-20
0
20
40
60
80
100
120
FREQUENCY (kHz)
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
Dropout Voltage vs.
Temperature
160
1.4
1.2
Output Voltage
vs. Input Voltage
3.5
3.4
Output Voltage
vs. Temperature
DROPOUT VOLTAGE (mV)
140
120
100
80
60
40
20
0
-40
-20
0
20
40
60
80
100
120
V
OUT
= 3.3V
V
IN
= V
OUT
+ 1V
C
OUT
= 0.47µF
OUTPUT VOLTAGE (V)
1
0.8
100µA
OUTPUT VOLTAGE (V)
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
-40
-20
0
20
40
V
OUT
= 3.3V
V
IN
= V
OUT
+1V
C
OUT
= 0.47µF
60
80
100
120
0.6
0.4
10mA
0.2
0
0
1
V
OUT
=1.2V
V
IN
=V
OUT
+1V
C
OUT
=0.47µF
TEMPERATURE (°C)
2
3
4
5
INPUT VOLTAGE (V)
6
7
TEMPERATURE (°C)
Ground Pin Current
vs. Output Current
14
3
2.7
Ground Pin Current
vs. Input Voltage
14
Ground Pin Current
vs. Input Voltage
GROUND CURRENT (µA)
12
10
8
6
4
2
0
V
OUT
= 1.2V
I
OUT
= 100uA
C
OUT
= 0.47µF
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
GROUND CURRENT (µA)
GROUND CURRENT (µA)
12
10
8
6
4
2
0
0
1
2
3
4
5
6
7
8
9
10
V
OUT
= 3.3V
V
IN
= V
OUT
+ 1V
C
OUT
= 0.47µF
2.4
2.1
1.8
1.5
1.2
0.9
0.6
0.3
0
2.5
3.5
4.5
5.5
6.5
V
OUT
= 1.2V
I
OUT
= 100µA
C
OUT
= 0.47µF
OUTPUT CURRENT (mA)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Ground Pin Current vs.
Temperature
20
18
100
90
Current Limit
1.0
Enable-On Threshold vs.
Temperature
ENABLE THRESHOLD (V)
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
-40
-20
0
20
40
60
V
OUT
= 3.3V
V
IN
= V
OUT
+ 1V
C
OUT
= 0.47µF
80
100
120
GROUND CURRENT (µA)
14
12
10
8
6
4
2
0
-40
-20
0
20
40
60
80
100
120
V
OUT
= 3.3V
V
IN
= V
OUT
+ 1V
C
OUT
=0.47µF
I
OUT
=10mA
CURRENT LIMIT (mA)
16
80
70
60
50
40
30
20
10
0
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
V
OUT
= 3.3
C
OUT
= 0.47µF
TEMPERATURE (°C)
INPUT VOLTAGE (V)
TEMPERATURE (°C)
June 2012
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M9999-061812-C
51单片机
