MICREL MIC5206

MIC5206
Micrel
MIC5206
150mA Low-Noise LDO Regulator
General Description
Features
The MIC5206 is an efficient linear voltage regulator with very
low dropout voltage (typically 17mV at light loads and 165mV
at 150mA), and very low ground current (600µA at 100mA
output), with better than 1% initial accuracy. It has a logic
compatible enable/shutdown control input and an internal
undervoltage monitor.
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Designed especially for hand-held, battery-powered devices,
the MIC5206 can be switched by a CMOS or TTL compatible
logic signal. When disabled, power consumption drops
nearly to zero. Dropout ground current is minimized to
prolong battery life.
Key features include an undervoltage monitor with an error
flag output, a reference bypass pin to improve its already lownoise performance (8-lead versions only), reversed-battery
protection, current limiting, and overtemperature shutdown.
The MIC5206 is available in several fixed voltages in a tiny
SOT-23-5 package. It features a pinout, similar to the LP2980,
but has significantly better performance. Fixed and adjustable output voltage versions, featuring the reference bypass
option, are available in the 8-lead Micrel Mini 8™ 8-lead
MSOP (micro small-outline package).
Error flag indicates undervoltage fault
High output voltage accuracy
Guaranteed 150mA output
Ultra-low-noise output (8-lead versions)
Low quiescent current
Low dropout voltage
Extremely tight load and line regulation
Very low temperature coefficient
Current and thermal limiting
Reversed-battery protection
“Zero” off-mode current
Logic-controlled electronic enable
Applications
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Cellular telephones
Laptop, notebook, and palmtop computers
Battery-powered equipment
PCMCIA VCC and VPP regulation/switching
Consumer/personal electronics
SMPS post-regulator/dc-to-dc modules
High-efficiency linear power supplies
For low-dropout regulators that are stable with ceramic
output capacitors, see the µCap MIC5245/6/7 family.
Typical Applications
47k
VOUT
1µF
MIC5206-x.xBM5
VIN
1
2
Enable
Shutdown
3
VOUT
5
100k
4
Enable (pin 3) may be
connected directly to
Supply Input (pin 1).
Flag Output
(optional)
tantalum
COUT
1µF tantalum
R1
Flag Output
(optional)
1
8
2
7
3
6
4
5
MIC5206BMM
VIN
Enable
Shutdown
Enable (pin 7) may be
connected directly to
Supply Input (pin 8).
R2
SOT-23-5 Fixed Voltage Application
Adjustable Voltage Application
Micrel Mini 8™ is a trademark of Micrel, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
January 2000
1
MIC5206
MIC5206
Micrel
Ordering Information
Part Number
Marking
Volts
Accuracy
Junction Temp. Range
Package
MIC5206-2.5BM5
LD25
2.5
1%
–40°C to +125°C
SOT-23-5
MIC5206-2.7BM5
LD27
2.7
1%
–40°C to +125°C
SOT-23-5
MIC5206-3.0BM5
LD30
3.0
1%
–40°C to +125°C
SOT-23-5
MIC5206-3.2BM5
LD32
3.2
1%
–40°C to +125°C
SOT-23-5
MIC5206-3.3BM5
LD33
3.3
1%
–40°C to +125°C
SOT-23-5
MIC5206-3.6BM5
LD36
3.6
1%
–40°C to +125°C
SOT-23-5
MIC5206-3.8BM5
LD38
3.8
1%
–40°C to +125°C
SOT-23-5
MIC5206-4.0BM5
LD40
4.0
1%
–40°C to +125°C
SOT-23-5
MIC5206-5.0BM5
LD50
5.0
1%
–40°C to +125°C
SOT-23-5
MIC5206BMM
—
Adj
1%
–40°C to +125°C
8-lead MSOP
MIC5206-3.0BMM
—
3.0
1%
–40°C to +125°C
8-lead MSOP
MIC5206-3.3BMM
—
3.3
1%
–40°C to +125°C
8-lead MSOP
MIC5206-3.6BMM
—
3.6
1%
–40°C to +125°C
8-lead MSOP
MIC5206-3.8BMM
—
3.8
1%
–40°C to +125°C
8-lead MSOP
MIC5206-4.0BMM
—
4.0
1%
–40°C to +125°C
8-lead MSOP
MIC5206-5.0BMM
—
5.0
1%
–40°C to +125°C
8-lead MSOP
Other voltages available. Contact Micrel for details.
Pin Configuration
EN GND IN
3
2
1
LDxx
4
5
FLAG
OUT
MIC5206-xxBM5
(Fixed Output Voltage)
OUT
1
8
IN
OUT
1
8
IN
OUT
2
7
EN
OUT
2
7
EN
FLAG
3
6
GND
FLAG
3
6
GND
GND
4
5
BYP
GND
4
5
ADJ
MIC5206-x.xBMM
(Fixed Output Voltage)
MIC5206BMM
(Adjustable Ouput Voltage)
Pin Description
MIC5206
SOT-23-5
MIC5206
MSOP-8
Pin Name
Pin Function
1
8
IN
Supply Input
2
4, 6
GND
3
7
EN
Enable/Shutdown (Input): CMOS compatible input. Logic high = enable,
logic low or open = shutdown. Do not leave floating.
4
3
FLAG
Error Flag (Output): Open-collector output. Active low indicates an ouput
undervoltage condition.
5 (fixed)
BYP
Reference Bypass: Connect external 470pF capacitor to GND to reduce
output noise. May be left open.
5 (adj.)
ADJ
Adjust (Input): Adjustable regulator feedback input. Connect to resistor
voltage divider.
1,2
OUT
Regulator Output
5
MIC5206
Ground
2
January 2000
MIC5206
Micrel
Absolute Maximum Ratings (Note 1)
Operating Ratings (Note 2)
Supply Input Voltage (VIN) ............................ –20V to +20V
Enable Input Voltage (VEN) ........................... –20V to +20V
Power Dissipation (PD) ............... Internally Limited, Note 3
Junction Temperature (TJ) ....................... –40°C to +125°C
Lead Temperature (Soldering, 5 sec.) ...................... 260°C
Supply Input Voltage (VIN) ........................... +2.5V to +16V
Enable Input Voltage (VEN) .................................. 0V to VIN
Junction Temperature (TJ) ....................... –40°C to +125°C
SOT-23-5 (θJA) ......................................................... Note 3
8-lead MSOP (θJA) ................................................... Note 3
Electrical Characteristics
VIN = VOUT + 1V; IL = 100µA; CL = 1.0µF; VEN ≥ 2.0V; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted.
Symbol
Parameter
Conditions
Min
Typical
VO
Output Voltage Accuracy
variation from nominal VOUT
∆VO/∆T
Output Voltage
Temperature Coefficient
Note 4
∆VO/VO
Line Regulation
VIN = VOUT + 1V to 16V
0.004
0.012
%/V
∆VO/VO
Load Regulation
IL = 0.1mA to 150mA, Note 5
0.02
0.2
%
VIN – VO
Dropout Voltage, Note 6
IL = 100µA
17
IL = 50mA
110
IL = 100mA
140
IL = 150mA
165
50
70
150
230
250
300
275
350
mV
mV
mV
mV
mV
mV
mV
mV
–1
–2
Max
Units
1
2
%
%
40
ppm/°C
IGND
Quiescent Current
VEN ≤ 0.4V (shutdown)
VEN ≤ 0.18V (shutdown)
0.01
1
5
µA
µA
IGND
Ground Pin Current, Note 7
VEN ≥ 2.0V, IL = 100µA
80
IL = 50mA
350
IL = 100mA
600
IL = 150mA
1300
125
150
600
800
1000
1500
1900
2500
µA
µA
µA
µA
µA
µA
µA
µA
PSRR
Ripple Rejection
75
dB
ILIMIT
Current Limit
VOUT = 0V
320
∆VO/∆PD
Thermal Regulation
Note 8
0.05
%/W
eno
Output Noise
IL = 50mA, CL = 4.7µF, 470pF from BYP
to GND (MM package only)
260
nV Hz
VIL
Enable Input Logic-Low Voltage
regulator shutdown
VIH
Enable Input Logic-High Voltage
regulator enabled
IIL
Enable Input Current
VIL ≤ 0.4V
VIL ≤ 0.18V
VIH ≥ 2.0V
VIH ≥ 2.0V
500
mA
Enable Input
IIH
0.4
0.18
2.0
V
V
V
–1
–2
20
25
µA
µA
µA
µA
–6
–10
%
0.2
0.4
V
0.1
+1
µA
0.01
5
Error Flag Output
VERR
Flag Threshold
undervoltage condition (below nominal)
Note 9
VOL
Output Logic-Low Voltage
IL = 1mA, undervoltage condition
IFL
Flag Leakage Current
flag off, VFLAG = 0V to 16V
January 2000
3
–2
–1
MIC5206
MIC5206
Micrel
Note 1:
Exceeding the absolute maximum rating may damage the device.
Note 2.
The device is not guaranteed to function outside its operating rating.
Note 3:
The maximum allowable power dissipation at any TA (ambient temperature) is PD(max) = (TJ(max) – TA) ÷ θJA. Exceeding the maximum
allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The θJA of the
MIC5205-x.xBM5 (all versions) is 220°C/W, and the MIC5206-x.xBMM (all versions) is 200°C/W, mounted on a PC board (see “Thermal
Considerations” for further details).
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. 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.
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.
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.
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 VIN = 16V for t = 10ms.
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
The error flag comparator includes 3% hysteresis.
Typical Characteristics
-60
-100
1E+1
1k 1E+4
10k 1E+5
1M 1E+7
10M
10 1E+2
100k 1E+6
100 1E+3
FREQUENCY (Hz)
PSRR (dB)
-20
Power Supply
Rejection Ratio
-60
-80
IOUT = 1mA
COUT = 1µF
-100
1E+1
1k 1E+4
10k 1E+5
1M 1E+7
10M
10 1E+2
100k 1E+6
100 1E+3
FREQUENCY (Hz)
MIC5206
-60
0
VIN = 6V
VOUT = 5V
-40
-40
IOUT = 100µA
COUT = 2.2µF
CBYP = 0.01µF
-100
1E+1
1k 1E+4
10k 1E+5
1M 1E+7
10M
10 1E+2
100k 1E+6
100 1E+3
FREQUENCY (Hz)
-20
PSRR (dB)
0
60
VIN = 6V
VOUT = 5V
-80
IOUT = 100µA
COUT = 1µF
Power Supply Ripple Rejection
vs. Voltage Drop
RIPPLE REJECTION (dB)
-40
-80
-20
Power Supply
Rejection Ratio
Power Supply
Rejection Ratio
VIN = 6V
VOUT = 5V
-40
-60
IOUT = 1mA
COUT = 2.2µF
CBYP = 0.01µF
-80
-100
1E+1
1k 1E+4
10k 1E+5
1M 1E+7
10M
10 1E+2
100k 1E+6
100 1E+3
FREQUENCY (Hz)
4
50
1mA
40
30
10mA
IOUT = 100mA
20
COUT = 1µF
10
0
0
0.1
0.2
0.3
VOLTAGE DROP (V)
0.4
Power Supply Ripple Rejection
vs. Voltage Drop
RIPPLE REJECTION (dB)
PSRR (dB)
-20
0
VIN = 6V
VOUT = 5V
PSRR (dB)
0
Power Supply
Rejection Ratio
100
90
80
1mA
70
60
IOUT = 100mA
50
40
10mA
30
20
10
0
COUT = 2.2µF
CBYP = 0.01µF
0
0.1
0.2
0.3
VOLTAGE DROP (V)
0.4
January 2000
MIC5206
Micrel
Typical Characteristics
VIN = 6V
VOUT = 5V
-20
PSRR (dB)
-40
-60
-80
-100
1E+1
1k 1E+4
10k 1E+5
1M 1E+7
10M
10 1E+2
100k 1E+6
100 1E+3
FREQUENCY (Hz)
VIN = 6V
VOUT = 5V
-20
-40
-60
IOUT = 100mA
COUT = 1µF
-80
-60
0
PSRR (dB)
10mA
0.1
0.01
VOUT = 5V
COUT = 10µF
electrolytic
1mA
NOISE (µV/√Hz)
NOISE (µV/√Hz)
10mA, COUT = 1µF
1
-60
IOUT = 100mA
COUT = 2.2µF
CBYP = 0.01µF
0.1
0.01
VOUT = 5V
0.0001
1E+1
10 1E+2
1k 1E+4
100 1E+3
10k 1E+5
100k 1E+6
1M 1E+7
10M
FREQUENCY (Hz)
Noise Performance
10
1
10mA
0.1
100mA
0.01
VOUT = 5V
COUT = 22µF
1mA
0.001
tantalum
CBYP = 10nF
0.0001
1k 1E+4
1E+1
10 1E+2
1M 1E+7
10k 1E+5
100k 1E+6
10M
100 1E+3
FREQUENCY (Hz)
Noise Performance
0.1
0.01
1mA
VOUT = 5V
COUT = 10µF
0.001 electrolytic
10mA
CBYP = 100pF
0.0001
1k 1E+4
1E+1
10 1E+2
1M 1E+7
10k 1E+5
100k 1E+6
10M
100 1E+3
FREQUENCY (Hz)
Dropout Voltage
vs. Output Current
10
10mA
100mA
0.1
VOUT = 5V
COUT = 10µF
electrolytic
CBYP = 1nF
1mA
0.0001
1k 1E+4
1E+1
10 1E+2
1M 1E+7
10k 1E+5
100k 1E+6
10M
100 1E+3
FREQUENCY (Hz)
January 2000
320
1
NOISE (µV/√Hz)
1
100mA
Noise Performance
10
10mA
100mA
0.1
0.01
0.001
1mA
COUT = 1µF
CBYP = 10nF
0.001
1
0.0001
1k 1E+4
1E+1
10 1E+2
1M 1E+7
10k 1E+5
100k 1E+6
10M
100 1E+3
FREQUENCY (Hz)
NOISE (µV/√Hz)
VIN = 6V
VOUT = 5V
Noise Performance
100mA
10000
Noise Performance
10
1
100
1000
CAPACITANCE (pF)
10
-40
Noise Performance
0.001
10
10
-100
1E+1
1k 1E+4
10k 1E+5
1M 1E+7
10M
10 1E+2
100k 1E+6
100 1E+3
FREQUENCY (Hz)
10
0.01
100
Power Supply
Rejection Ratio
-80
-100
1E+1
1k 1E+4
10k 1E+5
1M 1E+7
10M
10 1E+2
100k 1E+6
100 1E+3
FREQUENCY (Hz)
0.001
1000
IOUT = 10mA
COUT = 2.2µF
CBYP = 0.01µF
NOISE (µV/√Hz)
PSRR (dB)
-20
-40
-100
1E+1
1k 1E+4
10k 1E+5
1M 1E+7
10M
10 1E+2
100k 1E+6
100 1E+3
FREQUENCY (Hz)
Power Supply
Rejection Ratio
0
VIN = 6V
VOUT = 5V
-80
IOUT = 10mA
COUT = 1µF
Turn-On Time
vs. Bypass Capacitance
10000
VOUT = 5V
COUT = 10µF
electrolytic
CBYP = 1nF
1mA
0.0001
1k 1E+4
1E+1
10 1E+2
1M 1E+7
10k 1E+5
100k 1E+6
10M
100 1E+3
FREQUENCY (Hz)
5
DROPOUT VOLTAGE (mV)
PSRR (dB)
-20
0
NOISE (µV/√Hz)
0
Power Supply
Rejection Ratio
TIME (µs)
Power Supply
Rejection Ratio
280
+125°C
240
200
+25°C
160
120
–40°C
80
40
0
0
40
80
120
160
OUTPUT CURRENT (mA)
MIC5206
MIC5206
Micrel
If an error indication is not required, FLAG may be left open
and the pullup resistor may be omitted.
Enable Pin Ramp and the Error Flag
Applications Information
Enable/Shutdown
Forcing EN (enable/shutdown) high (> 2V) enables the regulator. EN is compatible with CMOS logic gates.
If the enable/shutdown feature is not required, connect EN
(enable) to IN (supply input). Refer to the text with Figures 1a
and 2.
Input Capacitor
To prevent indeterminate behavior on the error flag during
power down of the device, ensure that the fall time of the
enable pin signal, from logic high to logic low, is faster than
100µs.
Fixed Regulator Applications
MIC5206-x.xBM5
A 1µF capacitor should be placed from IN to GND if there is
more than 10 inches of wire between the input and the ac filter
capacitor or if a battery is used as the input.
Reference Bypass Capacitor
VIN
VOUT
5
2
100k
3
BYP (reference bypass) is connected to the internal voltage
reference. A 470pF capacitor (CBYP) connected from BYP to
GND quiets this reference, providing a significant reduction in
output noise. See Figure 2. CBYP reduces the regulator phase
margin; when using CBYP, output capacitors of 2.2µF or
greater are generally required to maintain stability.
The start-up speed of the MIC5206 is inversely proportional
to the size of the reference bypass capacitor. Applications
requiring a slow ramp-up of output voltage should consider
larger values of CBYP. Likewise, if rapid turn-on is necessary,
consider omitting CBYP.
If output noise is not a major concern, omit CBYP and leave
BYP open.
4
COUT
1µF
Error Flag
EN (pin 3) may be
connected directly
to IN (pin 1).
Figure 1a. Low-Noise Fixed Voltage Application
EN (pin 3) is shown connected to IN (pin 1) for an application
where enable/shutdown is not required. The error flag is
shown with a 100kΩ pullup resistor.
47k
VOUT
1µF
Flag Output
(optional)
Output Capacitor
An output capacitor is required between OUT and GND to
prevent oscillation. The minimum size of the output capacitor
is dependent upon whether a reference bypass capacitor is
used. 1.0µF minimum is recommended when CBYP is not
used (see Figure 2). 2.2µF minimum is recommended when
CBYP is 470pF (see Figure 2). Larger values improve the
regulator’s transient response. The output capacitor value
may be increased without limit.
1
8
2
7
3
6
4
5
VIN
Enable
MIC5206-x.xBMM
Figure 1b. Low-Noise Fixed Voltage Application
Figure 1b is an example of a basic configuration where the
lowest-noise operation is not required. COUT = 1µF minimum.
The error flag is shown with a 47kΩ pullup resistor.
Ultra-Low-Noise Application
The output capacitor should have an ESR (effective series
resistance) of about 5Ω or less and a resonant frequency
above 1MHz. Most tantalum or aluminum electrolytic capacitors are adequate; film types will work, but are more expensive. Since many aluminum electrolytics have electrolytes
that freeze at about –30°C, solid tantalums are recommended for operation below –25°C.
At lower values of output current, less output capacitance is
required for output stability. The capacitor can be reduced to
0.47µF for current below 10mA or 0.33µF for currents below
1mA.
No-Load Stability
47k
VOUT
Flag Output
(optional)
2.2µF
1
8
2
7
3
6
4
BYP
MIC5206-x.xBMM
VIN
5
CBYP
470pF
Figure 2. Ultra-Low-Noise Fixed Voltage Application
Figure 2 includes a 470pF capacitor for low-noise operation
and shows EN (pin 7) connected to IN (pin 8) for an application where enable/shutdown is not required. The error flag is
shown with a 47kΩ pullup resistor.
The MIC5205 will remain stable and in regulation with no load
(other than the internal voltage divider) unlike many other
voltage regulators. This is especially important in CMOS
RAM keep-alive applications.
Error Flag Ouput
Adjustable Regulator Applications
Figure 3 shows the MIC5206BMM adjustable output voltage
configuration. Two resistors set the output voltage. The
formula for output voltage is:
The error flag is an open-collector output and is active (low)
when an undervoltage of approximately 5% below the nominal output voltage is detected. A pullup resistor from IN to
FLAG is shown in all schematics.
MIC5206
1
 R2 
VOUT = 1.242V × 
+ 1
 R1 
6
January 2000
MIC5206
Micrel
Resistor values are not critical because ADJ (adjust) has a
high input impedance, but for best results use resistors of
470kΩ or less. A capacitor from ADJ to ground provides
greatly improved noise performance.
47k
VOUT
2.2µF
Flag Output
(optional)
1
8
2
7
3
6
4
R1
ADJ
FR4
220°C/W
Ceramic
200°C/W
The “worst case” value of 220°C/W assumes no ground
plane, minimum trace widths, and a FR4 material board.
The MIC5206-xxBMM (8-lead MSOP) has a thermal resistance of 200°C/W when mounted on a FR4 board with
minimum trace widths and no ground plane.
MIC5206BMM
CBYP
470pF
PC Board
Dielectric
θJA
FR4
200°C
MSOP Thermal Characteristics
Figure 3. Ultra-Low-Noise
Adjustable Voltage Application
Nominal Power Dissipation and Die Temperature
The MIC5206-x.xBM5 at a 25°C ambient temperature will
operate reliably at over 450mW power dissipation when
mounted in the “worst case” manner described above. At an
ambient temperature of 40°C, the device may safely dissipate over 380mW. These power levels are equivalent to a die
temperature of 125°C, the maximum operating junction temperature for the MIC5206.
Figure 3 also includes a 470pF capacitor for lowest-noise
operation and shows EN (pin 7) connected to IN (pin 8) for an
application where enable/shutdown is not required. COUT =
2.2µF minimum. The error flag is shown with a 47kΩ pullup
resistor.
Thermal Considerations
Layout
The MIC5206-x.xBM5 (5-lead SOT-23 package) has the
following thermal characteristics when mounted on a single
layer copper-clad printed circuit board.
Multilayer boards having a ground plane, wide traces near the
pads, and large supply bus lines provide better thermal
conductivity.
January 2000
θJA
SOT-23-5 Thermal Characteristics
VIN
5
R2
PC Board
Dielectric
For additional heat sink characteristics, please refer to Micrel
Application Hint 17, “Calculating P.C. Board Heat Sink Area
For Surface Mount Packages”.
7
MIC5206
MIC5206
Micrel
Package Information
1.90 (0.075) REF
0.95 (0.037) REF
1.75 (0.069)
1.50 (0.059)
3.00 (0.118)
2.60 (0.102)
DIMENSIONS:
MM (INCH)
1.30 (0.051)
0.90 (0.035)
3.02 (0.119)
2.80 (0.110)
0.20 (0.008)
0.09 (0.004)
10°
0°
0.15 (0.006)
0.00 (0.000)
0.50 (0.020)
0.35 (0.014)
0.60 (0.024)
0.10 (0.004)
SOT-23-5 (M5)
0.122 (3.10)
0.112 (2.84)
0.199 (5.05)
0.187 (4.74)
DIMENSIONS:
INCH (MM)
0.120 (3.05)
0.116 (2.95)
0.036 (0.90)
0.032 (0.81)
0.043 (1.09)
0.038 (0.97)
0.007 (0.18)
0.005 (0.13)
0.012 (0.30) R
0.012 (0.03)
0.0256 (0.65) TYP
0.008 (0.20)
0.004 (0.10)
5° MAX
0° MIN
0.012 (0.03) R
0.039 (0.99)
0.035 (0.89)
0.021 (0.53)
8-Lead MSOP (MM)
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
+ 1 (408) 944-0800
FAX
+ 1 (408) 944-0970
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http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or
other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.
© 2000 Micrel Incorporated
MIC5206
8
January 2000