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
nOutput voltage adjustable from −1.2V to −47V
n1.5A output current guaranteed, −55˚C to +150˚C
nLine regulation typically 0.01%/V
nLoad regulation typically 0.3%
nExcellent thermal regulation, 0.002%/W
n77 dB ripple rejection
nExcellent rejection of thermal transients
n50 ppm/˚C temperature coefficient
nTemperature-independent current limit
nInternal thermal overload protection
nP
+
Product Enhancement tested
nStandard 3-lead transistor package
nOutput short circuit protected
Typical Applications
Adjustable Negative Voltage Regulator
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DS009066-25
C1 =1 µF solid tantalum or 10 µF aluminum electrolytic required for stability. Output capacitors in the range of 1 µF to 1000 µF of aluminum or tantalum
electrolytic are commonly used to provide improved output impedance and rejection of transients.
*C2 =1 µF solid tantalum is required only if regulator is more than 4" from power-supply filter capacitor.
May 1999
LM137HV/LM337HV 3-Terminal Adjustable Negative Regulators (High Voltage)
© 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
InputOutput Voltage Differential 50V
Operating Junction Temperature Range
LM137HV −55˚C to +150˚C
LM337HV 0˚C to +125˚C
Storage Temperature −65˚C to +150˚C
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
=25˚C, 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
=25˚C, 10 mA I
OUT
I
MAX
0.3 0.5 0.3 1.0 %
Thermal Regulation T
J
=25˚C, 10 ms Pulse 0.002 0.02 0.003 0.04 %/W
Adjustment Pin Current 65 100 65 100 µA
Adjustment Pin Current
Change 10 mA I
L
I
MAX
25 25µA
3.0V |V
IN
−V
OUT
|50V, 4 6 3 6 µA
T
J
=25˚
Reference Voltage T
J
=25˚C, (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
,PP
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
=25˚C, 10 Hz f10 kHz 0.003 0.003 %
Ripple Rejection Ratio V
OUT
=−10V, f =120 Hz 60 60 dB
C
ADJ
=10 µF 66 77 66 77 dB
Long-Term Stability T
A
=125˚C, 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: −55˚C Tj+150˚C for the LM137HV, 0˚C Tj+125˚C for the LM337HV; VIN−VOUT =5V; and
IOUT =0.1A for the TO-39 package and IOUT =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. IMAX 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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Electrical Characteristics (Note 2) (Continued)
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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 showsa3mVstep 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, VOUT =−10V
VIN−VOUT =−40V
IL=0A0.25A0A
Vertical sensitivity, 5 mV/div
FIGURE 1.
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LM137HV, VOUT =−10V
VIN−VOUT =−40V
IL=0A0.25A0A
Horizontal sensitivity, 20 ms/div
FIGURE 2.
TO-3
Metal Can Package
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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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Typical Applications
Adjustable High Voltage Regulator
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Full output current not available at high input-output voltages
*The 10 µF capacitors are optional to improve ripple rejection
Current Regulator
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Adjustable Current Regulator
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Negative Regulator with Protection Diodes
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*When CLis larger than 20 µF, D1 protects the LM137HV in case the input
supply is shorted
**When C2 is larger than 10 µF and −VOUT is larger than −25V, D2
protects the LM137HV is case the output is shorted
High Stability −40V Regulator
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*Use resistors with good tracking TC <25 ppm/˚C
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Typical Performance Characteristics (H and K-STEEL Package)
Load Regulation
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Current Limit
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Adjustment Current
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Dropout Voltage
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Temperature Stability
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Minimum Operating Current
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Ripple Rejection
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Ripple Rejection
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Ripple Rejection
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Typical Performance Characteristics (H and K-STEEL Package) (Continued)
Output Impedance
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Line Transient Response
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Load Transient Response
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Physical Dimensions inches (millimeters) unless otherwise noted
Metal Can Package (H)
Order Number LM137HVH/883, LM137HVH-QMLV, or LM337HVH
NS Package Number H03A
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Metal Can Package (K)
Order Number LM337HVK STEEL
NS Package Number K02A
Metal Can Package (K)
Mil-Aero Products
Order Number LM137HVK/883, LM137HVK-QMLV, or SMD #7703404
NS Package Number K02C
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Notes
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COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
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accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
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LM137HV/LM337HV 3-Terminal Adjustable Negative Regulators (High Voltage)
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.