MIC5230
Micrel
MIC5230
10mA Microcurrent Voltage Regulator
Preliminary Information
General Description
The MIC5230 is a family of efficient linear voltage regulators
with a very low dropout voltage (typically 20mV at light loads
and 132mV at 10mA), and an extremely low ground current
(1µA typical, across the full output current range).
Designed especially for hand-held battery powered devices,
the MIC5230 offers better than 3% initial accuracy. This
regulator’s ability to also sink current improves regulation
under very light-load conditions.
The MIC5230 is offered in the tiny SOT-23-5 package with a
5.0V fixed output voltage. Other voltages are available.
Contact Micrel for details.
Features
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Extremely low quiescent current
Tiny SOT-23-5 surface mount package
Wide selection of output voltages
Guaranteed 10mA output
Low dropout voltage
No output capacitor needed
Insensitive to output capacitor ESR
Tight load and line regulation
Low temperature coefficient
Real time clocks
SRAM backup
Cellular telephones
Laptop, notebook, and palmtop computers
Battery-powered equipment
Bar code scanners
SMPS post-regulator/dc-to-dc modules
High-efficiency linear power supplies
Applications
Ordering Information
Part Number
MIC5230-5.0BM5
Marking
LC50
Voltage
5.0V
Temperature Range
–40°C to +85°C
Package
SOT-23-5
Other voltages available. Contact Micrel for details.
Typical Application
V
IN
6V
MIC5230-5.0BM5
1
2
3
4
5
V
OUT
5V
1.0µF
5V Linear Regulator Application
3-174
1997
MIC5230
Micrel
Pin Configuration
NC GND IN
3
2
1
LC50
4
5
Part
Identification
NC
OUT
MIC5230-5.0BM5
Pin Description
Pin Number
1
2
3,4
5
Pin Name
IN
GND
NC
OUT
Pin Function
Supply Input
Ground
Not internally connected. Connect to ground plane for lowest package
thermal resistance.
Regulated Output
3
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
IN
) .................................... –0.6V to +18V
Output Current (I
OUT
) .......................................... 0.5A peak
Power Dissipation (P
D
) ................................. 0.3W @ 25°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
Storage Temperature (T
A
) ....................... –60°C to +150°C
Operating Ratings
Input Voltage (V
IN
) ........................................... 3.5V to 16V
Output Current (I
OUT
) ................................................. 40mA
Ambient Temperature (T
A
) ......................... –40°C to +85°C
Junction Temperature (T
J
) ....................... –40°C to +125°C
Thermal Resistance .................................................
Note 6
1997
3-175
MIC5230
Micrel
Electrical Characteristics
V
IN
= V
OUT
+ 1V; I
L
= 1mA; C
L
= 1µF; T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+125°C; unless noted.
Symbol
V
OUT
∆V
OUT
/∆T
∆V
OUT
/V
OUT
∆V
OUT
/V
OUT
V
DO
I
Q
I
SC
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Parameter
Output Voltage
Output Voltage
Temperature Coefficient
Line Regulation
Load Regulation
Conditions
initial variation from nominal V
OUT
Note 2
V
IN
= 6V to 16V
I
L
= 10µA to 10mA,
Note 3
I
L
= 10µA sink to 10µA source,
Note 4
I
L
= 1mA
I
L
= 10mA
V
IN
= 6V, I
L
= 10mA
V
IN
= 16V, I
L
= 10mA
V
OUT
= 0V, V
DD
= 6V
Min
–3
Typ
Max
3
Units
%
ppm/°C
%
%
%
mV
mV
µA
µA
mA
800
0.2
0.12
2.4
13
132
1
1.1
200
1200
0.25
Dropout Voltage,
Note 5
Ground Pin Current
3
4
300
Short Circuit Current,
Note 1
General Note:
Devices are ESD protected; however, handling precautions are recommended.
Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when
operating the device outside of its rated operating conditions.
Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Regulation is measured at constant junction temperature using low duty cycle pulse testing.
Load regulation (sink to source) is the difference in output voltage when a 10µA current reverses from sinking to sourcing. The MIC5230 will
sink as well as source output current.
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.
The maximum allowable power dissipation is a function of the maximum junction temperature, T
J(max)
, the junction-to-ambient thermal
resistance,
θ
JA
, and the ambient temperature, T
A
. The maximum allowable power dissipation at any ambient temperature is calculated using:
P
D(max)
= (T
J(max)
– T
A
) /
θ
JA
. The
θ
JC
of the MIC5230 is 180°C/W. Mounted to a standard PC board, the
θ
JA
is approximately 220°C/W.
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MIC5230
Micrel
Typical Characteristics
Output Voltage
vs. Output Current
6
Dropout Characteristics
6
5V version
OUTPUT VOLTAGE (V)
SUPPLT VOLTAGE (V)
Source-Sink
Output Regulation
8
OUTPUT VOLTAGE (V)
V
IN
= 6.0V, 10V
5
V
IN
= 5.5V
4
3
2
1
0
0
10
20
30
SUPPLY CURRENT (mA)
40
5
4
3
R
L
= 100Ω
2
1
0
0
1
2
3
4
5
SUPPY VOLTAGE (V)
6
R
L
= 5k
6
4
SINK
2
SOURCE
0
-10
-5
0
5
OUTPUT CURRENT (µA)
10
Ground Current
vs. Input Voltage
1.2
GROUND CURRENT (µA)
Output Voltage
vs. Output Current
6
2.0
OUTPUT VOLTAGE (V)
Ground Current
vs. Output Current
1.0
0.8
85°C
CURRENT (µA)
5.5
–40°C
5
85°C
4.5
25°C
1.5
25°C
0.6
0.4
0.2
0
0
2
4 6 8 10 12 14 16
INPUT VOLTAGE (V)
–40°C
3
1.0
0.5
4
0
5 10 15 20 25 30 35 40
OUTPUT CURRENT (mA)
0
0
5 10 15 20 25 30 35 40
OUTPUT CURRENT (mA)
Current Limit
vs. Input Voltage
250
200
150
100
50
0
Dropout Voltage
vs. Output Current
0.6
GROUND CURRENT (µA)
Ground Current
vs. Temperature
3.0
2.5
2.0
1.5
1.0
0.5
0
-60 -30
0 30 60 90 120 150
TEMPERATURE (°)
OUTPUT VOLTAGE (V)
CURRENT LIMIT (mA)
0.5
85°C
0.4
0.3
25°C
0.2
0.1
0
0
5 10 15 20 25 30 35 40
OUTPUT CURRENT (mA)
–40°C
0
2
4
6
8
INPUT VOLTAGE (V)
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MIC5230
Micrel
Safe Operating Conditions
MIC5230 output current is not internally limited. Under short-
circuit conditions, output current is proportional to input
voltage and the resulting power dissipation may cause ex-
cessive junction temperatures. The typical short circuit cur-
rent with an input voltage of 6V is 200mA, or a power
dissipation of 1.2W. Since overtemperature shutdown is not
provided, power dissipation must be limited to prevent the
junction temperature from exceeding +125°C.
Microcurrent Converter
The MIC5230 can be used to regulate the output of an
MIC2660 charge pump to create a 3V to 5V converter. See
Figure 1. This converter is suitable for where 5V at 5mA or
less is needed within a circuit otherwise powered from a 3V
supply.
MIC2660
IN
3V
0.1µF
OUT
1µF
EN GND
MIC5230
IN
OUT
GND
1µF
V
OUT
+5V
Applications Information
Input Capacitor
A 0.1µF (or larger) capacitor should be placed from the IN
(supply input) to GND (ground) if there is more than 20 cm of
wire between IN and the ac filter capacitor or if supplied from
a battery.
Output Capacitors
The MIC5230 does not require an output capacitor for stabil-
ity. A 1µF or larger capacitor is recommended between OUT
(output) and GND to improve the regulator’s transient re-
sponse. 0.1µF can be used to reduce overshoot recovery
time at the expense of overshoot amplitude. The ESR (effec-
tive series resistance) of this capacitor has no effect on
regulator stability, but low-ESR capacitors improve high
frequency transient response. The value of this capacitor
may be increased without limit, but values larger than 10µF
tend to increase the settling time after a step change in input
voltage or output current.
The MIC5230 has no minimum load current; it will remain
stable and in regulation with no load (other than the internal
voltage divider). This is especially important in real-time clock
and CMOS RAM keep-alive applications.
Figure 1. 3V to 5V/5mA Converter
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1997
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