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CHT-LDOS Datasheet
High-Temperature,1A Low-Dropout Voltage
Regulator for symmetrical voltage applica-
tions.
3.3V; 5V; 12V or 15V (2.5V; 5.25V; 5.5V; 9V; 10V; 13V)
General Description
The CHT-LDOS is a 1A, low-dropout linear
voltage regulator compatible with high-tem-
perature environments. Typical operation
temperature range extends from -55°C to
225°C.
The circuit is stable throughout the whole
temperature range and under a large
choice of capacitive loads.
The minimum dropout voltage (V
in
-V
out
) is
2V with a 1A load current at 225°C and 1V
for load currents lower than 400mA. The
dropout voltage can span from 1 Volts to 20
Volts
(1)
.
CHT-LDOS is available in TO-254 pack-
age, TO-3 package and in bare die.
Related documents:
• AN-06016: “Selecting correct CISSOID
regulator depending on your applica-
tion”
• AN-06002: “Voltage regulator short-cir-
cuit protection and associated potential
startup problem”.
• AN-090477: “Power Dissipation Con-
siderations During Short Circuit Condi-
tions”
Applications
Power supplies for high-temperature
electronic systems used in Automo-
tive, Aeronautics, Aerospace or
Oil&Gas applications
.
Features
• 1V to 20V dropout Voltage @400mA
(1)
• 2V to 20V dropout Voltage @1A
(1)
• Max 1A output current @ 225°C
• 60dB input ripple rejection (0-100Hz)
• C
load
from 100nF to 1000µF, large ESR
range
• Output voltage programmable by bond-
ing option (bare die version)
• Available in TO-254 and TO-3 package
and bare die form (contact CISSOID)
• The start-up is operative over the whole
temperature range
• Latch-up free
• Validated at 225°C for 43800 hours
Standard voltages
• CHT-LDOS-033: 3.3V
• CHT-LDOS-050: 5.0V
• CHT-LDOS-120: 12.0V
• CHT-LDOS-150: 15.0V
Special voltages
1
• CHT-LDOS-025: 2.5V
• CHT-LDOS-0525: 5.25V
• CHT-LDOS-055: 5.5V
• CHT-LDOS-090: 9.0V
• CHT-LDOS-100: 10.0V
• CHT-LDOS-130: 13.0V
Typical application
1
Different lead times or MOQ may apply
CHT-LDO
C
out
GND
V
in
V
out
C
in
V
NOM
+2V V
NOM
CHT-LDOS
CHT-LDO
C
out
GND
V
in
V
out
C
in
V
NOM
+2V V
NOM
CHT-LDOS
CHT-LDOS
Datasheet
20-Dec-23
(Last Modification Date)
PUBLIC
Doc. DS-090551 V2.8
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Absolute Maximum Ratings
Supply Voltage Vin -0.3V…40V
Junction Temperature
(2)
(Tj) 315°C
Power dissipation
(3)
ESD Rating (expected)
Human Body Model <1kV
Operating Conditions
Supply Voltage V
in
to GND V
out
+(1V to 20V)
(1)
Junction temperature -55°C to +225°C
Power dissipation
(3)
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress
only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this speci-
fication is not implied. Frequent or extended exposure to absolute maximum rating conditions or above may affect device reliability.
Electrical Characteristics
Unless otherwise stated, the following table is relative to the 5V mode (CHT-LDOS-050) with
Vin=7V (Vout+2V). For other nominal voltages, see notes under this table.
Parameter
Condition
Min
Typ
Max
Units
Note
Output voltage
accuracy
I
L
=10mA
-55°C <Tj <225°C
-2
0
2
%
Output voltage
Temperature drift
I
L
=10mA
25°C <Tj <225°C
0
40
80
ppm
(4)
Output voltage line
regulation
dropout=2V to 15V
I
L
=60mA, -55°C <Tj <225°C
-1
1
mV/V
(5)
Output voltage load
regulation
(i.e. R
out
)
I
L
=10mA to 1A @2V dropout
-55°C <Tj <225°C
0.04
0.1
V/A
(6)
(Vin-Vout)
(droupout)
I
L
400mA, -55°C <Tj <225°C
1
V
I
L
=1A, -55°C <Tj <225°C
2
V
Quiescent Ground
Pin current
0 < I
L
<1A
-55°C
225°C
3.2
2.9
mA
(7)
Power supply rejec-
tion ratio
f=0Hz ..100Hz
I
load
=100mA
60
dB
Foldback current
2.5
A
Short-circuit current
20°C <Tj <225°C
300
mA
Output noise
10Hz-10kHz
I
L
=100mA, -30°C <Tj <225°C
tbd
µV
RMS
Notes:
(1) Vin max=30V
(2) Above 225°C (T
j
), a minimum load current of few mA could be required.
(3) Max Power dissipation depends on packaging. CHT-LDOS in TO-3 or TO-254 packages presents a “junction-to-
case” thermal resistance of maximum 5°C/W (Rth).
(4) ppm are defined as [d(Vout)/d(T)]/Vout. For 5V mode, 40ppm corresponds to 200µV/°C.
(5) Defining “x” as the nominal voltage, the line regulation is better than x/5 mV/V.
(6) This includes the packaging parasitic resistor.
(7) Defining “x” as the nominal voltage, the typical quiescent current at 2V dropout can be approximated as
2.8+x/13 mA @ -30°C and 2.5+x/13 mA at 225°C.