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CHT-LDOP Datasheet
Version: 2.2
20-Mar-12
(Last Modification Date)
High-Temperature, 1A, Low-Dropout Voltage
Regulator
2.5V, 3.3V, 5V, 5.5V, 9V, 10V, 12V, 13V or 15V
General Description
The CHT-LDOP is a 1A, low-dropout linear
voltage regulator compatible with high-
temperature environments. Typical opera-
tion temperature range extends from
-50°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
(1)
20 Volts .
The circuit is a one-die solution.
CHT-LDOP is available in TO-254 pack-
age device.
Related documents:
AN-06016:
“Selecting correct CIS-
SOID regulator depending on your ap-
plication”
AN-06002:
“Voltage regulator short-
circuit protection and associated po-
tential startup problem”.
AN-090477:
“Power Dissipation Con-
siderations During Short Circuit Condi-
tions”
Features
1V to 20V dropout Voltage @400mA
2V to 20V dropout Voltage @1A
Max 1A output current @ 225°C
60dB input ripple rejection (0-100Hz)
C
load
from 100nF to 1000µF, large
ESR range
Available in TO-254 package (for other
package options, please contact CIS-
SOID)
The start-up is operative over the
whole temperature range
Latch-up free
Validated at 225°C for 43800 hours
(and still on-going)
(1)
(1)
Available voltages:
CHT-LDOP-025:
CHT-LDOP-033:
CHT-LDOP-050:
CHT-LDOP-055 :
CHT-LDOP-090 :
CHT-LDOP-100 :
CHT-LDOP-120:
CHT-LDOP-130:
CHT-LDOP-150:
2.5V
3.3V
5.0V
5.5V
9.0V
10.0V
12.0V
13.0V
15.0V
Applications
Power supplies for high-temperature elec-
tronic systems used in Well logging,
Automotive, Aeronautics or Aerospace
applications.
Typical application
+V
in
≥ V
out
+2V
V
out
V
in
C
in
V
out
CHT-LDOP
C
out
GND
R
load
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CHT-LDOP Datasheet
Gonzalo Picún (+32-10-489214)Mar.
12
Absolute Maximum Ratings
Supply Voltage V
in
to GND
(2)
Junction Temperature T
j
Operating Conditions
Supply Voltage V
in
to GND
Junction temperature
Power dissipation
(3)
-0.3V to 40V
300°C
Power dissipation
<1kV
(3)
V
out
+(1V to 20V)
-55°C to +225°C
(1)
ESD Rating (expected)
Human Body Model
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: V
in
=17V, V
out
=15V
(CHT-LDOP-150).
Bold underlined
values indi-
cate values over the whole temperature range (-55°C < T j < +225°C).
For other nominal volt-
ages, see notes under this table.
Parameter
Input voltage
V
in(1)
Condition
-55°C <T
j
<225°C
I
L
<400mA
-55°C <T
j
<225°C
I
L
=1A
-55°C <T
j
<225°C
I
L
=10mA
-55°C <T
j
<225°C
I
L
=10mA
+25°C <T
j
<225°C
(V
in
-V
out
) = 2V to 15V
I
L
=10mA
-55°C <T
j
<225°C
I
L
=10mA to 1A
(V
in
-V
out
) = 2V
-55°C <T
j
<225°C
I
L
<1A
T
j
= -55°C
I
L
<1A
T
j
= +225°C
(V
in
-V
out
) = 2V to 15V
-55°C <T
j
<225°C
(V
in
-V
out
) = 2V to 15V
-55°C <T
j
<225°C
f = 0 to 100Hz
I
L
=100mA
-55°C <T
j
<225°C
10Hz to 10kHz
I
L
=100mA
-55°C <T
j
<225°C
TO-254 package
1
V
2
-2
+2
%
Min
Typ
Max
30
Units
V
Dropout voltage
(V
in
-V
out
)
Output voltage accuracy
Output voltage temperature
drift
(4)
Output voltage line
regulation (PSRR
DC
)
(5)
Output voltage load
regulation (R
out
)
(6)
Quiescent ground pin
current
(7)
Foldback current
Short circuit current
I
SC
Power supply rejection ratio
PSRR
(8)
Output noise
e
on
Junction-to-ambient thermal
resistance (free air)
R
thja
Junction-to-case thermal
resistance
R
thjc
0
40
80
ppm
-3
+3
mV/V
40
4.1
100
mV/A
mA
3.8
1.5
2
80
60
2.5
A
mA
dB
tbd
Vrms
50
°C/W
TO-254 packages
5
°C/W
Notes:
(1) The maximum input voltage V
in
is V
out
+20V or 30V, whichever is less.
(2) Above 225°C (T
j
), a minimum load current of few mA could be required.
(3) Max Power dissipation depends on packaging.
(4) ppm are defined as 1e-6x[d(Vout)/d(T)]/Vout. For a nominal output of 15V, 40ppm corresponds to 600µV/°C.
(5) Defining “x” as the nominal voltage, the line regulation is better than
x/5
mV/V.
(6) This includes the packaging parasitic resistance for TO-254 packages.
(7) Defining “x” as the nominal voltage, the typical quiescent current at 2V dropout can be approximated as
2.95+x/13 in mA @ -55°C and 2.65+x/13 in mA at 225°C.
(8) Preliminary data.
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CHT-LDOP Datasheet
Gonzalo Picún (+32-10-489214)Mar.
12
Input Capacitor and Output Load Recommended Specifications
+V
in
C
in
V
in
GND
V
out
CHT-LDOP
I
Load
³0A
C
S
R
S
C
M
R
M
C
B
R
B
Load
Resistances in series with capacitors represent the internal ESR of these capacitors.
Output capacitor recommendations:
Equivalent C
out
≥ 220nF with low ESR
Large capacitors:
C
B
= 0-1000µF
R
B
= 0.2-
Medium capacitors:
C
M
= 0-6µF
R
M
= 0.1-1
Input capacitor recommendations:
Equivalent C
in
≥ 220nF with low ESR
Small capacitors:
C
S
= 220-1000nF
R
S
=10-50m
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CHT-LDOP Datasheet
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12
Operating Conditions
Start-up conditions
The start-up is operative over the whole
temperature range as long as all loads are
connected to ground. The start-up is not
guaranteed if the positive regulator output
has a current path directly connected to a
negative voltage. Indeed, such load condi-
tion can lead to wrong activation of the
short-circuit protection, i.e. a bad start-up
or a bad recovering after short-circuit. In
this case, it is recommended to use our
CHT-LDOS regulator family instead of
CHT-LDOP regulator family.
Please refer to our application notes for
more details:
AN-06016:
“Selecting correct CIS-
SOID regulator depending on your ap-
plication”
AN-06002:
“Voltage regulator short-
circuit protection and associated po-
tential startup problem”.
Power dissipation considerations
When determining the maximum power
dissipated by the regulator, not only the
dissipation during normal operation must
be considered, but also the power dissi-
pated during any eventual short circuit or
overload.
During short circuit or overload, worst case
conditions are normally found for maxi-
mum Vin and a shorting resistance in the
order of few Ohms.
Sinking current or raising the output
voltage above the input voltage can
cause permanent damage to the part.
Regulator floating ground
When the ground becomes disconnected,
the output voltage gets unregulated, caus-
ing possible damage to other circuits con-
nected to Vout. If the ground terminal is
reconnected while Vin is applied, perma-
nent damage may also occur to the regu-
lator. If a regulator needs to be reconnect-
ed with the power supply on, then connect
the ground terminal first.
Entering into short-circuit or overload con-
ditions with high input voltages Vin may
lead to extreme overheating, placing the
part above Absolute Maximum Rating
conditions.
Please refer to our application note for
more detail:
AN-090477:
“Power Dissipation Con-
siderations During Short Circuit Condi-
tions”
Shorting the regulator input
If the input terminal is shorted to ground
once the output capacitance has been
charged, a large current corresponding to
the discharge of the output capacitor will
flow from the output to the input through
the drain-body diode of the internal pass
transistor. This large current may cause
the permanent damage of the part.
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Gonzalo Picún (+32-10-489214)Mar.
12
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