LM137HV/LM337HV
3-Terminal Adjustable Negative Regulators
(High Voltage)
General Description
The LM137HV/LM337HV are adjustable 3-terminal negative
voltage regulators capable of supplying in excess of -1.5A
over an output voltage range of -1.2V to -47V. These regu-
lators are exceptionally easy to apply, requiring only 2 exter-
nal resistors to set the output voltage and 1 output capacitor
for frequency compensation. The circuit design has been op-
timized for excellent regulation and low thermal transients.
Further, the LM137HV series features internal current limit-
ing, thermal shutdown and safe-area compensation, making
them virtually blowout-proof against overloads.
The LM137HV/LM337HV serve a wide variety of applica-
tions
including
local
on-card
regulation,
programmable-output voltage regulation or precision current
regulation. The LM137HV/LM337HV are ideal complements
to the LM117HV/LM317HV adjustable positive regulators.
Features
n
Output voltage adjustable from -1.2V to -47V
n
1.5A output current guaranteed, -55C to +150C
n
Line regulation typically 0.01%/V
n
Load regulation typically 0.3%
n
Excellent thermal regulation, 0.002%/W
n
77 dB ripple rejection
n
Excellent rejection of thermal transients
n
50 ppm/C temperature coefficient
n
Temperature-independent current limit
n
Internal thermal overload protection
n
P
+
Product Enhancement tested
n
Standard 3-lead transistor package
n
Output short circuit protected
Typical Applications
Adjustable Negative Voltage Regulator
DS009066-1
DS009066-25
C1 = 1 F solid tantalum or 10 F aluminum electrolytic required for stability. Output capacitors in the range of 1 F to 1000 F of aluminum or tantalum
electrolytic are commonly used to provide improved output impedance and rejection of transients.
*
C2 = 1 F solid tantalum is required only if regulator is more than 4" from power-supply filter capacitor.
May 1999
LM137HV/LM337HV
3-T
erminal
Adjustable
Negative
Regulators
(High
V
oltage)
1999 National Semiconductor Corporation
DS009066
www.national.com
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
(Note 4)
Power Dissipation
Internally limited
Input -- Output Voltage Differential
50V
Operating Junction Temperature Range
LM137HV
-55C to +150C
LM337HV
0C to +125C
Storage Temperature
-65C to +150C
Lead Temperature
(Soldering, 10 sec.)
300
ESD rating is to be determined.
Electrical Characteristics
(Note 2)
Parameter
Conditions
LM137HV
LM337HV
Units
Min
Typ
Max
Min
Typ
Max
Line Regulation
T
J
= 25C, 3V
|V
IN
-V
OUT
|
50V,
0.01
0.02
0.01
0.04
%/V
(Note 3) I
L
= 10 mA
Load Regulation
T
J
= 25C, 10 mA
I
OUT
I
MAX
0.3
0.5
0.3
1.0
%
Thermal Regulation
T
J
= 25C, 10 ms Pulse
0.002
0.02
0.003
0.04
%/W
Adjustment Pin Current
65
100
65
100
A
Adjustment Pin Current
Change
10 mA
I
L
I
MAX
2
5
2
5
A
3.0V
|V
IN
-V
OUT
|
50V,
4
6
3
6
A
T
J
= 25
Reference Voltage
T
J
= 25C, (Note 4)
-1.225 -1.250 -1.275 -1.213 -1.250 -1.287
V
3V
|V
IN
-V
OUT
|
50V, (Note 4)
-1.200 -1.250 -1.300 -1.200 -1.250 -1.300
V
10 mA
I
OUT
I
MAX
, P
P
MAX
Line Regulation
3V
|V
IN
-V
OUT
|
50V, (Note 3)
0.02
0.05
0.02
0.07
%/V
I
L
= 10 mA
Load Regulation
10 mA
I
OUT
I
MAX
, (Note 3)
0.3
1
0.3
1.5
%
Temperature Stability
T
MIN
T
j
T
MAX
0.6
0.6
%
Minimum Load Current
|V
IN
-V
OUT
|
50V
2.5
5
2.5
10
mA
|V
IN
-V
OUT
|
10V
1.2
3
1.5
6
mA
Current Limit
|V
IN
-V
OUT
|
13V
K Package
1.5
2.2
3.2
1.5
2.2
3.5
A
H Package
0.5
0.8
1.6
0.5
0.8
1.8
A
|V
IN
-V
OUT
| = 50V
K Package
0.2
0.4
0.8
0.1
0.4
0.8
A
H Package
0.1
0.17
0.5
0.050
0.17
0.5
A
RMS Output Noise, % of
V
OUT
T
J
= 25C, 10 Hz
f
10 kHz
0.003
0.003
%
Ripple Rejection Ratio
V
OUT
= -10V, f = 120 Hz
60
60
dB
C
ADJ
= 10 F
66
77
66
77
dB
Long-Term Stability
T
A
= 125C, 1000 Hours
0.3
1
0.3
1
%
Thermal Resistance, Junction
H Package
12
15
12
15
C/W
to Case
K Package
2.3
3
2.3
3
C/W
Thermal Resistance, Junction
to Ambient
H Package
140
140
C/W
K Package
35
35
C/W
Note 1: "Absolute Maximum Ratings" indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits.
Note 2: Unless otherwise specified, these specifications apply: -55C
T
j
+150C for the LM137HV, 0C
T
j
+125C for the LM337HV; V
IN
-V
OUT
= 5V; and
I
OUT
= 0.1A for the TO-39 package and I
OUT
= 0.5A for the TO-3 package. Although power dissipation is internally limited, these specifications are applicable for
power dissipations of 2W for the TO-39 and 20W for the TO-3. I
MAX
is 1.5A for the TO-3 package and 0.2A for the TO-39 package.
Note 3: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are cov-
ered under the specification for thermal regulations. Load regulation is measured on the output pin at a point
1
/
8
" below the base of the TO-3 and TO-39 packages.
Note 4: Refer to RETS137HVH drawing for LM137HVH or RETS137HVK for LM137HVK military specifications.
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2
Electrical Characteristics
(Note 2) (Continued)
DS009066-2
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3
Thermal Regulation
When power is dissipated in an IC, a temperature gradient
occurs across the IC chip affecting the individual IC circuit
components. With an IC regulator, this gradient can be espe-
cially severe since power dissipation is large. Thermal regu-
lation is the effect of these temperature gradients on output
voltage (in percentage output change) per Watt of power
change in a specified time. Thermal regulation error is inde-
pendent of electrical regulation or temperature coefficient,
and occurs within 5 ms to 50 ms after a change in power dis-
sipation. Thermal regulation depends on IC layout as well as
electrical design. The thermal regulation of a voltage regula-
tor is defined as the percentage change of V
OUT
, per Watt,
within the first 10 ms after a step of power is applied. The
LM137HV's specification is 0.02%/W, max.
In
Figure 1, a typical LM137HV's output drifts only 3 mV (or
0.03% of V
OUT
= -10V) when a 10W pulse is applied for
10 ms. This performance is thus well inside the specification
limit of 0.02%/W x 10W = 0.2% max. When the 10W pulse is
ended, the thermal regulation again shows a 3 mV step as
the LM137HV chip cools off. Note that the load regulation er-
ror of about 8 mV (0.08%) is additional to the thermal regu-
lation error. In
Figure 2, when the 10W pulse is applied for
100 ms, the output drifts only slightly beyond the drift in the
first 10 ms, and the thermal error stays well within 0.1%
(10 mV).
Connection Diagram
See Physical Dimensions section for further information)
DS009066-3
LM137HV, V
OUT
= -10V
V
IN
-V
OUT
= -40V
I
L
= 0A
0.25A
0A
Vertical sensitivity, 5 mV/div
FIGURE 1.
DS009066-4
LM137HV, V
OUT
= -10V
V
IN
-V
OUT
= -40V
I
L
= 0A
0.25A
0A
Horizontal sensitivity, 20 ms/div
FIGURE 2.
TO-3
Metal Can Package
DS009066-5
Bottom View
Order Number LM137HVK/883, LM137HVK-QMLV, or
SMD #7703404
See NS Package Number K02C
Order Number LM337HVK STEEL
See NS Package Number K02A
TO-39
Metal Can Package
DS009066-6
Bottom View
Order Number LM137HVH/883, LM137HVH-QMLV, SMD
#7703404
or LML337HVH
See NS Package Number H03A
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4
Typical Applications
Adjustable High Voltage Regulator
DS009066-7
Full output current not available at high input-output voltages
*
The 10 F capacitors are optional to improve ripple rejection
Current Regulator
DS009066-8
Adjustable Current Regulator
DS009066-9
Negative Regulator with Protection Diodes
DS009066-10
*
When C
L
is larger than 20 F, D1 protects the LM137HV in case the input
supply is shorted
**
When C2 is larger than 10 F and -V
OUT
is larger than -25V, D2
protects the LM137HV is case the output is shorted
High Stability -40V Regulator
DS009066-11
*
Use resistors with good tracking TC
<
25 ppm/C
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5
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