CLM2931
CORPORATION
ADJUSTABLE VERSION ONLY:
V
IN
= 14V, V
O
= 3V, I
O
= 10mA, R1 = 27k, C2 = 100µF, T
J
= 25
o
PARAMETER
Output Voltage Range
Line Regulation
Load Regulation
Output Impedance
Quiescent Current
Output Noise Voltage
Long Term Stability
Ripple Rejection
Dropout Voltage
Maximum Operational Input Voltage
Maximum Line Transient
Reverse Polarity Input Voltage, DC
Reverse Polarity Input Voltage, Transient
On/Off Threshold Current
Threshold Votage
On
Off
Note 1:
Note 2:
Note 3:
Note 4:
26
60
-15
-50
CLM2931C
MIN
3.0
0.2
0.3
40
0.4
15
0.8
100
0.4
0.02
0.05
0.3
33
70
-30
-80
20
2.0
2.2
50
1.2
0.2
0.6
1.0
1.0
TYP
MAX
24
1.5
1.0
UNITS
V
mV
mV
mΩ/V
mA
mA
mA
µVrms
%/1000h
%/V
V
V
V
V
V
V
µA
V
V
O
= 3V
I
O
= 10mA, Reference Voltage <1.5V
V
O
>-0.3V, R
L
= 500Ω
1% Duty Cycle, T<100ms, R
L
= 500Ω
f
O
= 120Hz
I
O
< 10mA
I
O
= 100mA
V
OUT
+ 0.6V<V
IN
<26V
5mA<I
O
<100mA
100mADC and 10mArms, 100Hz-10kHz
I
O
= 10mA
I
O
= 100mA
During Shutdown R
L
= 500Ω
10Hz-100kHz
CONDITIONS
3.25
See TYPICAL APPLICATIONS notes to ensure constant junction temperature, low duty cycle pulse testing used.
All limits are at 25
o
C or over the full operating temperature junction range of -40
o
C to +125
o
C.
The maximum power dissipation is a function of maximum junction temperature, total thermal resistance, and ambient temperature.
Human body model, 100µF discharged through 1.5KΩ.
APPLICATION HINTS
The CLM2931 requires an output capacitor for device stability.
The value required varies greatly depending upon the
application circuit and other factors. The high frequency
characteristics of electolytic capacitors depend greatly on the
type and also on the manufacturer. Sometimes only bench
testing is the only means to determine the proper capacitor
type and value. The high quality 100µF aluminum electrolytic
covers all general application circuits, this stability can be
obtained with a tantalum electrolytic value of 47µF.
Another critical point of electrolytic characteristics is its
performance over temperature. The CLM2931 is designed to
operate starting at -40
o
C which may not be true in the case of
electrolytic. Higher temperatures are generally no problem.
The electrolytic type in aluminum will freeze at around -30
o
C.
This could cause an oscillation at output of regulator. At a
lower temperature requirement by many applications the
capacitor should maintain its performance. So as a result, for an
application which regulator junction temperature does not exceed
25
o
C, the output capacitor can be reduced by the factor of two
over the value needed for the entire temperature range.
Other points with linear regulators is that the twitch higher
output current stability decreases. In most applications the
CLM2931 is operating at a few milliamps.
In these
applications the output capacitance can be further reduced.
For example, when the regulator is running at 10mA output
current the output capacitance value is half compared to the
same regulator that is running at 100mA.
With the CLM2931CT adjustable regulator, the minimum value
of output capacitance is a function of the output voltage. The
value decreases with higher output voltages, since the
internal loop gain is reduced.
The worst case occurs at the lower temperature and
maximum operating currents, the entire circuit and the
electrolytic, should be cooled down to the minimum
temperature. The minimum of 0.6 volts required at the input
of regulator above the output to keep the power dissipation
and die heating to its minimum. After the value for the
capacitor has been determined for actual use, the value
should be doubled.
CALOGIC CORPORATION,
237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CALOGIC [ CALOGIC, LLC ]
