The Leader in High Temperature
Semiconductor Solutions
CHT-LDN-DATASHEET
Version: 1.6
5-Nov-10
(Last Modification Date)
High-Temperature, Negative
3.3V; 5V; 5.5V; 9V; 10V; 12V; 13V or 15V,
Low-Dropout SOI-CMOS Voltage Regulator.
General Description
The CHT-LDN is a 1A, low-dropout nega-
tive linear voltage regulator compatible
with high-temperature environments. Typi-
cal operation temperature range extends
from -30°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
-1.5V for load current up to 1A. The drop-
out voltage can span from -1.5 Volt down
(1)
to -20 Volts .
The circuit is a one-die solution.
CHT-LDN is available as die or packaged
(currently TO-3 and TO-254) on demand.
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”.
Applications
Power supplies for high-temperature elec-
tronic systems used in Well logging,
Automotive, Aeronautics or Aerospace
applications.
Features
(1)
-1.5V to -20V dropout Voltage
Max 1A output current @ 225°C
60dB input ripple rejection
(0-200Hz)
C
load
from 100nF to 1000µF, large
ESR range
Available as die or in custom package
on demand. (3-pin compatible)
The start-up is operative over the
whole temperature range
Latch-up free
Available voltages:
CHT-LDN-033:
CHT-LDN-050:
CHT-LDN-055 :
CHT-LDN-090 :
CHT-LDN-100 :
CHT-LDN-120:
CHT-LDN-130:
CHT-LDN-150:
-3.3V
-5.0V
-5.5V
-9.0V
-10.0V
-12.0V
-13.0V
-15.0V
Typical application
C
in
GND
CHT-LDN
C
out
R
load
-V
in
≤ -V
out
-2V
V
in
V
out
-V
out
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(Last Modification Date)
Contact
CHT-LDN-Datasheet
: Gonzalo Picún (+32-10-489214)Nov.
10
Absolute Maximum Ratings
Supply Voltage Vin
(2)
Junction Temperature (Tj)
(3)
Power dissipation
0.3…-40V
300°C
Operating Conditions
Supply Voltage
Junction temperature
(3)
Power Dissipation
-1.5 to -20V dropout
-30°C to 225°C
(1)
ESD Rating (expected)
Human Body Model
>1kV
Electrical Characteristics
The following table is relative to the -5V mode (CHT-LDN-050) with Vin=-7V (-Vout-2V). For
other nominal voltage, see notes under this table.
Parameter
Condition
Min Typ
Max
Units
note
Output voltage accu-
racy
Output voltage T°
drift
Output voltage line
regulation
I
L
=10mA
-30°C <Tj <225°C
I
L
=10mA
-30°C <Tj <225°C
|Vin|=|Vout|+2V to 14V
I
L
=60mA, -30°C <Tj <225°C
|Vin|>14V
I
L
=60mA, -30°C <Tj <225°C
Output voltage load
regulation
(i.e. R
out
)
|Vin|-|Vout|
(droupout)
Quiescent
Pin current
I
L
=10mA to 1A
|Vin|=|Vout|+2V
-30°C <Tj <225°C
I
L
=1A, -30°C <Tj <225°C
Ground
0 < I
L
<1A
-30°C
225°C
f=0Hz ..200Hz; |Vin|>14V
I
load
=100mA
-20°C <Tj <225°C
10Hz-1kHz
I
L
=100mA, 25°C
680
1.5
-2
0
0
40
2
80
%
ppm
(4)
0
3
mV/V
(5)
-1
1
mV/V
(5)
0.05
0.1
V/A
(6)
V
mA
2.45
2.63
(7)
Power supply rejec-
tion ratio
Foldback current
Short-circuit current
Output noise
60
2.7
3
200
dB
A
mA
µV
RMS
(8)
(9)
Notes:
(1) |Vin| max=30V
(2) Above 225°C (T
j
), a minimum load current of 10 mA could be required.
(3) Max Power dissipation depends on packaging. CHT-LDN 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 correspond to -200µV/°C.
(5) Defining “x” as the nominal voltage, the line regulation is better than
x/5
mV/V for |Vin|>14V and better than
3x/5 mV/V for |Vin|≤14V
(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
2.275+
x
*0.035 (mA) @ -30°C and 2.345+
x
*0.057 (mA) @ 225°C.
(8) Defining “x” as the nominal voltage, the minimum power supply rejection ratio is 66-1.2x for |Vin|>14V and better
than 56-1.2x for |Vin|≤14V
(9) Defining “x” as the nominal voltage, typical noise level is (x/15)*680µV.
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10
Output Load, recommended specifications
C
in
-V
in
V
in
GND
CHT-LDN
R
S
C
S
V
out
R
M
C
M
R
B
C
B
I
Load
³5mA
Load
A minimum load current of 5mA is required. Bellow this value, a small oscillation of a few tens
of mV can occur at the regulator output.
Resistances in series with capacitors represent the internal ESR of these capacitors.
For large capacitors:
C
B
= 0 to 1000µF
R
B
= 0.2 to
For medium capacitors:
C
M
= 0 to 6µF
R
M
=0.1 to 1
For small capacitors:
C
S
= 100n to 220nF
R
S
=10m to 50m
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”.
Fast load current transients
Output voltage overshoots and under-
shoots are ~10% of the nominal regulated
voltage when C
Load
>22µF (ESR<1ohm)
and load current transients (10mA1A)
within 1µs. For transients longer than
10µs, load capacitance of 1µF is enough.
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.
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
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10
transistor. This large current may cause
the permanent damage of the part.
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 recon-
nected with the power supply on, then
connect the ground terminal first.
Measurements (CHT-LDN-150)
Note : Temperatures hereafter are ambient temperatures.
16
14
12
10
8
6
4
2
0
0
0.5
1
1.5
2
14.8
14.9
-V
OUT
225°C
-40°C
15.1
-V
OUT
225°C
Slope < 70m
15
150°C 200°C
100°C
50°C
25°C
-40°C
I
load
(A)
2.5
3
14.7
0
0.5
1
1.5
2
I
load
(A)
2.5
3
Figure 1: -V
out
vs.I
Load
(@2V dropout)
Figure 2: Zoom on figure 1
0.12
15.4
I
SC
(A)
0.1
0.08
0.06
15.3
15.2
15.1
15
-V
OUT
0.04
0.02
0
-50
0
50
100
150
200
14.9
14.8
T(°C)
250
-50
14.7
0
50
100
150
200
T(°C)
250
300
Figure 3:Short-circuit current vs. T°
Figure 4: -V
out
vs. T° (dropout=2V ; I
load
=60mA, 4
samples)
-V
OUT
15.2
275°C
250°C
15.0
200°C
100°C
25°C
14.8
15
2.4
2.2
2
1.8
1.6
1.4
1.2
20
25
Max I
Load
(A)
Dr
o
po
Dr
op
ut=
2V
V
ou
t=
1.5
-40°C
15
20
25
-V
IN
30
30
1
-50
50
Temperature (°C)
150
250
Figure 5: -V
out
vs. -V
in
over T° (I
load
=60mA)
Figure 6: Typical max load current over T° vs. drop-
out
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: Gonzalo Picún (+32-10-489214)Nov.
10
10
-08
Output noise spectral density (V²/Hz)
0
-20
dB
(V
out
/V
in
)
25°C
225°C
10
-09
-40
-60
-80
10
-10
V
noise RMS
(10Hz-1kHz)=680µV
10
-11
10
100
1k
f(Hz)
-100
f(Hz)
10
100
1k
10k
10k
Figure 7: S
Vout
(V²/Hz)@25°C, I
load
=100mA
Figure 8: Input ripple rejection
Packaging and Pinout
TO-3 Metal Can
TO-254 Header
V
in
V
out
Case
floating
GND
(Case)
GND
Bottom view
Ordering Information
Ordering Reference
CHT-LDN-033-TO3-T
CHT-LDN-033- TO254-T
CHT-LDN-050-TO3-T
CHT-LDN-050- TO254-T
CHT-LDN-055-TO3-T
CHT-LDN-055- TO254-T
CHT-LDN-090-TO3-T
CHT-LDN-090-TO254-T
CHT-LDN-100-TO3-T
CHT-LDN-100-TO254-T
CHT-LDN-120-TO3-T
CHT-LDN-120-TO254-T
CHT-LDN-130-TO3-T
CHT-LDN-130-TO254-T
CHT-LDN-150-TO3-T
CHT-LDN-150-TO254-T
Package
Metal TO3
Metal TO254
Metal TO3
Metal TO254
Metal TO3
Metal TO254
Metal TO3
Metal TO254
Metal TO3
Metal TO254
Metal TO3
Metal TO254
Metal TO3
Metal TO254
Metal TO3
Metal TO254
Output
Voltage
3.3V
3.3V
5V
5V
5.5V
5.5V
9V
9V
10V
10V
12V
12V
13V
13V
15V
15V
V
out
V
in
Front view
Temperature
Range
-55°C to +225°C
-55°C to +225°C
-55°C to +225°C
-55°C to +225°C
-55°C to +225°C
-55°C to +225°C
-55°C to +225°C
-55°C to +225°C
-55°C to +225°C
-55°C to +225°C
-55°C to +225°C
-55°C to +225°C
-55°C to +225°C
-55°C to +225°C
-55°C to +225°C
-55°C to +225°C
Marking
CHT-LDN-033
CHT-LDN-033
CHT-LDN-050
CHT-LDN-050
CHT-LDN-055
CHT-LDN-055
CHT-LDN-090
CHT-LDN-090
CHT-LDN-100
CHT-LDN-100
CHT-LDN-120
CHT-LDN-120
CHT-LDN-130
CHT-LDN-130
CHT-LDN-150
CHT-LDN-150
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