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.
Including 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, reducing
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
September 2008
M9999-090508-C
Micrel, Inc.
MIC5232
Block Diagram
Ordering Information
Part Number
MIC5232-1.2YD5
MIC5232-2.5YD5
MIC5232-2.8YD5
MIC5232-3.3YD5
MIC5232-1.2YML
MIC5232-2.5YML
MIC5232-2.8YML
MIC5232-3.3YML
Notes:
1. Overbar/Underbar symbol (
/ __ ) may not be to scale.
Marking
Code
(1)
ZA12
ZA25
ZA28
ZA33
12Z
25Z
28Z
33Z
Voltage
(2)
1.2V
2.5V
2.8V
3.3V
1.2V
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
Package
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
®(3)
6-Pin 2mm x 2mm MLF
®(3)
Lead Finish
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
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.
®
September 2008
2
M9999-090508-C
Micrel, Inc.
MIC5232
Pin Configuration
EN GND VIN
1
3
2
EN 1
GND 2
6
5
EP
4
NC
NC
VOUT
4
NC
5
VOUT
VIN 3
MIC5232-x.xYD5
TSOT-23-5 (D5)
MIC5232-x.xYML
2mm x 2mm MLF
®
(ML)
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
EP
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.
September 2008
3
M9999-090508-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
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
Min
-2.0
-3.0
Typ
Max
+2.0
+3.0
40
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
(7)
0.02
0.2
60
100
1.8
0.1
70
0.02
55
35
400
0.25
1.0
1.5
300
3
1.5
120
1
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
September 2008
4
M9999-090508-C
Micrel, Inc.
MIC5232
Typical Characteristics
80
70
60
50
dB
40
30
20 V
OUT
= 3.3V
V
IN
= V
OUT
+ 1V
10 I
OUT
= 100µA
C
OUT
= 0.47µF
0
0.01 0.1
1
10
100
FREQUENCY (kHz)
Power Supply
Rejection Ratio
DROPOUT VOLTAGE (mV)
120
100
80
60
40
20
Dropout Voltage
vs. Output Current
DROPOUT VOLTAGE (mV)
90
80
70
60
50
40
30
20
10
0
Dropout Voltage
vs. Temperature
1000
0
0 1 2 3 4 5 6 7 8 9 10
OUTPUT CURRENT (mA)
V
OUT
= 3.3V
C
OUT
= 0.47µF
V
OUT
= 3.3V
I
OUT
= 100µA
C
OUT
= 0.47µF
100 120
TEMPERATURE (°C)
160
DROPOUT VOLTAGE (mV)
140
120
100
80
60
40
20
0
Dropout Voltage
vs. Temperature
1.4
1.2
1
Output Voltage
vs. Input Voltage
3.5
3.4
3.3
3.2
3.1
3
2.9
Output Voltage
vs. Temperature
0.8 100µA
0.6
0.4
V
OUT
= 3.3V
I
OUT
= 10mA
C
OUT
= 0.47µF
100 120
TEMPERATURE (°C)
0.2
0
0
1
10mA
V
OUT
= 1.2V
C
OUT
= 0.47µF
2
3
4
5
6
INPUT VOLTAGE (V)
7
2.8
2.7
2.6
2.5
V
OUT
= 3.3V
V
IN
= V
OUT
+ 1V
C
OUT
= 0.47µF
100 120
TEMPERATURE (°C)
14
12
10
8
6
4
2
Ground Pin Current
vs. Output Current
3.0
2.7
2.4
2.1
1.8
1.5
1.2
0.9
0.6
0.3
Ground Pin Current
vs. Input Voltage
14
12
10
8
6
4
Ground Pin Current
vs. Input Voltage
0
0 1 2 3 4 5 6 7 8 9 10
OUTPUT CURRENT (mA)
V
OUT
= 3.3V
V
IN
= V
OUT
+ 1V
C
OUT
= 0.47µF
0
2.5 3 3.5 4 4.5 5 5.5 6 6.5 7
INPUT VOLTAGE (V)
V
OUT
= 1.2V
I
OUT
= 100µA
C
OUT
= 0.47µF
2
0
2.5 3 3.5 4 4.5 5 5.5 6 6.5 7
INPUT VOLTAGE (V)
V
OUT
= 1.2V
I
OUT
= 10mA
C
OUT
= 0.47µF
20
GROUND CURRENT (µA)
18
16
14
12
10
8
6
4
2
0
Ground Pin Current
vs. Temperature
100
80
60
40
Current Limit
vs. Input Voltage
ENABLE THRESHOLD (V)
1
0.8
0.6
0.4
0.2
0
Enable-On Threshold
vs. Temperature
V
OUT
= 3.3V
V
IN
= V
OUT
+ 1V
I
OUT
= 10mA
C
OUT
= 0.47µF
100 120
TEMPERATURE (°C)
20
0
2.5 3 3.5 4 4.5 5 5.5 6 6.5 7
INPUT VOLTAGE (V)
V
OUT
= 3.3V
C
OUT
= 0.47µF
V
OUT
= 3.3V
V
IN
= 4.3V
C
OUT
= 0.47µF
100 120
TEMPERATURE (°C)
September 2008
5
M9999-090508-C
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