800mA Low Dropout Regulator
SCSI-II Active Terminator
CLM1117
FEATURES
Guaranteed 800mA Output
Three Terminal Adjustable or Fixed 2.85V, 3V, 3.3V, 5V,
10V & 12V
Very Low Quiescent Current
Low Dropout Voltage of 1.2 Volts at Full Load
Extremely Tight Load and Line Regulation
Very Low Temperature Coefficient
Fixed 2.8V Device for SCSI-II Active Terminator
Logic-Controlled Electronic Shutdown
Internal Overcurrent Limiting & Thermal Overload
Protection
Surface Mount Package SOT-223
APPLICATIONS
SCSI-II Active Terminator
Portable/ Palm Top / Notebook Computers
Battery Chargers
Disk Drives
Portable Consumer Equipment
Portable Instrumentation
SMPS Post-Regulator
PRODUCT DESCRIPTION
The Calogic CLM1117 is a low power positive voltage
regulator designed to meet 800mA output current and comply
with SCSI-II specifications with a fixed output voltage of
2.85V. This device is an excellent choice for use in battery-
powered applications, as active terminators for the SCSI bus,
and portable computers. The CLM1117 features very low
quiescent current and very low dropout voltage of 1.2V at a
full load and lower as output current decreases. This product
is available as an adjustable or fixed 2.85V, 3V, 3.3V, and 5V
output voltages.
The device is offered in a 3-pin surface mount package
SOT-223. The output capacitor of 10
F or larger is needed
for output stability of CLM1117 as required by most of the
other regulator circuits.
ORDERING INFORMATION
Part
Package
Temperature
CLM1117M
SOT-223
Industrial
CLM1117M-X
SOT-223
Industrial
X = Output Voltage. 5V = Standard.
Contact factory for 2.85V, 3.0V, 3.3V, 10V and 12V.
CORPORATION
PIN CONNECTIONS
SOT-223
TAB IS
GND
CLM1117
ADJ./GND V
OUT
V
IN
1
2
3
1N-12
FRONT VIEW
CALOGIC CORPORATION,
237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
ABSOLUTE MAXIMUM RATINGS
Power Dissipation . . . . . . . . . . . . . . . . . . . . . Internally Limited
Lead Temp. (Soldering, 5 Seconds) . . . . . . . . . . . . . . . 260
o
C
Storage Temperature Range . . . . . . . . . . . . -65
o
C to +150
o
C
Operating Junction Temperature Range
CLM1117 . . . . . . . . . . . . . . . . . . . . . . . . . . -40
o
C to +125
o
C
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5V to 6V
Input Supply Voltage . . . . . . . . . . . . . . . . . . . . . . -20V to +20V
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2KV Min
CLM1117
CALOGIC CORPORATION,
237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CORPORATION
ELECTRICAL CHARACTERISTICS: V
IN
= V
OUT
+1, T
A
= 25
o
C, CL = 3.3
f, unless otherwise noted. Boldface apply over full
operating temperature range.
PARAMETER
TYP
MIN
MAX
UNITS
CONDITIONS
Output Voltage
2.85
2.85
2.85
3.0
3.0
3.30
3.30
5.0
5.0
2.82
2.79
2.79
2.97
2.94
3.27
3.24
4.95
4.90
2.88
2.91
2.91
3.03
3.06
3.33
3.36
5.05
5.10
V
I
OUT
= 10mA, I
IN
= 4.85V
0
I
OUT
800mA, 4.25
V
IN
10V
0
I
OUT
500mA, V
IN
= 4.05V
I
OUT
= 10mA, V
IN
= 5.00V
0
I
OUT
800mA, 4.50
V
IN
10V
I
OUT
= 10mA, I
IN
= 5.30V
0
I
OUT
800mA, 4.80
V
IN
10V
I
OUT
= 10mA, I
IN
= 7.00V
0
I
OUT
800mA, 6.50
V
IN
12V
Output Voltage
Temperature Stability
0.05
%
(Note 1)
Line Regulation
1.00
1.00
1.00
1.00
6.00
7.00
7.00
10.00
mV
4.25V
V
IN
10V, V
OUT
= 2.85, I
OUT
= 0
4.50V
V
IN
12V, V
OUT
= 3.00, I
OUT
= 0
4.80V
V
IN
12V, V
OUT
= 3.30, I
OUT
= 0
4.50V
V
IN
15V, V
OUT
= 5.00, I
OUT
= 0
Load Regulation
1.00
1.00
1.00
1.00
10.00
12.00
12.00
15.00
mV
0
I
OUT
800mA, V
IN
= 4.25V, V
OUT
= 2.85
0
I
OUT
800mA, V
IN
= 4.50V, V
OUT
= 3.00
0
I
OUT
800mA, V
IN
= 4.80V, V
OUT
= 3.30
0
I
OUT
800mA, V
IN
= 6.50V, V
OUT
= 5.00
Dropout Voltage
(Note 2)
1.00
1.05
1.10
1.10
1.15
1.20
V
I
L
= 100mA
I
L
= 500mA
I
L
= 800mA
Quiescent Voltage
5.00
10.00
mA
4.25V
V
IN
6.5V
Current Limit
800
950
1200
mA
(V
IN
- V
OUT
) = 5V
Thermal Regulation
0.01
0.1
%/W
25
o
C, 30mS Pulse
Ripple Rejection
60
75
dB
f
RIPPLE
= 120Hz, (V
IN
- V
OUT
) = 3V, V
RIPPLE
= 1V
p-p
Long Term Stability
0.03
%
125
o
C, 1000Hrs
RMS Output Noiase
0.003
%
% of V
OUT
, 10Hz
f
10kHz
Thermal Resistance
15
o
C/W
o
Junction to case, at tab
Note 1: Output temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 2: Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below its nominal value measured
at 1V differential at very low values of programmed output voltage, the minimum input supply voltage of 2V (2.3V over temperature) must be
taken input account.
Note 3: 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 effect.
APPLICATION NOTES
EXTERNAL CAPACITOR
To ensure the stability of the CLM1117 an output capacitor of
at least 10
F (tantalum) or 50
F (aluminum) is required. The
value may change based on the application requirements on
the output load or temperature range. The capacitor equivalent
series resistance (ESR) will effect the CLM1117 stability. The
value of the ESR can vary from the type of capacitor used in
the applications. The recommended value for ESR is 0.5
.
The output capacitance could increase in size to above the
minimum value. The larger value of output capacitance as
high as 100
F can improve the load transient response.
SOLDERING METHODS
The CLM1117 SOT-223 package is designed to be compatible
with infrared reflow or vapor-phase reflow soldering techniques.
During soldering the non-active or mildly active fluxes may be
used. The CLM1117 die is attached to the heatsink lead
which exits opposite the input, output, and ground pins.
Hand soldering and wave soldering should be avoided since
these methods can cause damage to the device with
excessive thermal gradients on the package. The SOT-223
recommended soldering method are as follows: vapor phase
reflow and infrared reflow with the component preheated to
within 65
o
C of the soldering temperature range.
THERMAL CHARACTERISTICS
The thermal resistance of CLM1117 is C
o
/W from junction to
tab and 31 C
o
/W from tab to ambient for a total of 46 C
o
/W
from junction to ambient. The CLM1117 features the internal
thermal limiting to protect the device during overload
conditions. Special care needs to be taken during continuous
load conditions to insure the maximum junction temperature
does not exceed 125
o
C.
Taking the FR-4 printed circuit board and 1/16 thick with 1
ounce copper foil as an experiment (fig.1 & fig.2), the PCB
material is effective at transmitting heat with the tab attached
to the pad area and a ground plane layer on the backside of
the substrate. Refer to table 1 for the results of the
experiment.
The thermal interaction from other components in the
application can effect the thermal resistance of the CLM1117.
The actual thermal resistance can be determined with
experimentation. CLM1117 power dissipation is calculated as
follows:
P
D
= (V
IN
- V
OUT
) (I
OUT
)
Maximum Junction Temperature Range:
T
J
= T
ambient
(max) + P
D
(thermal resistance (Junction-to-ambient))
Maximum Junction Temperature must not exceed 125
o
C.
P
O
= (10V - 2.85) (105mA) = (7.15) (105mA) = 750mW
CLM1117
CORPORATION
FIGURE 1. CIRCUIT LAYOUT, THERMAL EXPERIMENTS
10V
+
10
F
2.85V
27K
10
F
CLM1117 - 2.85
1N-13
CALOGIC CORPORATION,
237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
FIGURE 2. SUBSTRATE LAYOUT FOR SOT-223
50 X 50mm
35 X 17mm
16 X 10mm
1N-14
TABLE 1.
TOTAL PC BOARD AREA
TOPSIDE COPPER AREA
BACKSIDE COPPER AREA
THERMAL RESISTANCE
JUNCTION TO AMBIENT
2500mm
2500mm
2500mm
2500mm
2500mm
1600mm
2500mm
2500mm
1600mm
900mm
900mm
2500mm
1250mm
950mm
2500mm
1800mm
600mm
1250mm
915mm
600mm
240mm
240mm
2500mm
2500mm
2500mm
0
0
1600mm
0
0
0
900mm
0
46
o
C/W
o
47
o
C/W
o
49
o
C/W
o
51
o
C/W
o
53
o
C/W
o
55
o
C/W
o
58
o
C/W
o
59
o
C/W
o
67
o
C/W
o
72
o
C/W
o
85
o
C/W
o
ACTIVE VS PASSIVE TERMINATION
The improvement in noise immunity and low quiescent power
of the terminator of less than 1W is the key advantage of
active termination compared to passive termination. The
CLM1117 significantly improves the noise level and signals on
the bus by the terminating point due to variations in voltage at
the termination point due to variation in the V
term
power line.
Another advantage of active termination is the improvement in
the impedance matching. The low impedance of the device
makes the termination resistance more closely matched to the
impedance of the cable. This improvement increases the
data rate by 10 times, from 1mbyte/s to 10mbyte/s. The
CLM1117 increases the protection and the reliability of the
application since it features internal current limiting,
overvoltage protection, and thermal protection.
CLM1117
ACTIVE TERMINATION CONFIGURATION
5V
IN5817
TERMPWR
CLM1117-2.85
10
F
2.85V
110K
+
6 METERS MAX
10
F
5V
IN5817
CLM1117-2.85
10
F
2.85V
110K
+
10
F
110K
6 METERS MAX
110K
110K
110K
UP TO 27 LINES
+
+
1N-15
CORPORATION
Information furnished by Calogic is believed to be accurate and reliable. However, no responsibility is assumed for its use: nor for any infringement of patents or other
rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent rights of Calogic.
CALOGIC CORPORATION,
237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
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