LM337H [NSC]
3-Terminal Adjustable Negative Regulators; 三端可调负稳压器
| 型号： | LM337H |
| 厂家： | 
National Semiconductor |
| 描述： | 3-Terminal Adjustable Negative Regulators |
| 文件： | 总12页 (文件大小：834K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
November 2004
LM137/LM337
3-Terminal Adjustable Negative Regulators
n Excellent thermal regulation, 0.002%/W
n 77 dB ripple rejection
General Description
The LM137/LM337 are adjustable 3-terminal negative volt-
age regulators capable of supplying in excess of −1.5A over
an output voltage range of −1.2V to −37V. These regulators
are exceptionally easy to apply, requiring only 2 external
resistors to set the output voltage and 1 output capacitor for
frequency compensation. The circuit design has been opti-
mized for excellent regulation and low thermal transients.
Further, the LM137 series features internal current limiting,
thermal shutdown and safe-area compensation, making
them virtually blowout-proof against overloads.
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 is short circuit protected
LM137 Series Packages and Power Capability
The LM137/LM337 serve a wide variety of applications in-
cluding local on-card regulation, programmable-output volt-
age regulation or precision current regulation. The LM137/
LM337 are ideal complements to the LM117/LM317
adjustable positive regulators.
Rated
Power
Dissipation
20W
Design
Device
Package
Load
Current
1.5A
LM137/337 TO-3 (K)
TO-39 (H)
2W
0.5A
Features
n Output voltage adjustable from −1.2V to −37V
n 1.5A output current guaranteed, −55˚C to +150˚C
n Line regulation typically 0.01%/V
n Load regulation typically 0.3%
LM337
LM337
TO-220 (T)
SOT-223
(MP)
15W
1.5A
2W
1A
Typical Applications
Comparison between SOT-223 and
D-Pak (TO-252) Packages
Adjustable Negative Voltage Regulator
00906731
Scale 1:1
00906701
Full output current not available at high input-output voltages
†
C1 = 1 µF solid tantalum or 10 µF aluminum electrolytic required for
stability
*C2 = 1 µF solid tantalum is required only if regulator is more than 4" from
power-supply filter capacitor
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
© 2004 National Semiconductor Corporation
DS009067
www.national.com
Absolute Maximum Ratings (Notes 1,
LM337
0˚C to +125˚C
−40˚C to +125˚C
−65˚C to +150˚C
300˚C
LM337I
4)
Storage Temperature
Lead Temperature (Soldering, 10 sec.)
Plastic Package (Soldering, 4 sec.)
ESD Rating
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
260˚C
Power Dissipation
Input-Output Voltage Differential
Operating Junction Temperature
Range
Internally Limited
40V
2k Volts
LM137
−55˚C to +150˚C
Electrical Characteristics (Note 1)
Parameter
Conditions
LM137
Typ
LM337
Units
Min
Max
Min
Typ
Max
Line Regulation
Tj = 25˚C, 3V ≤ |VIN − VOUT| ≤ 40V
(Note 2) IL = 10 mA
0.01
0.02
0.01
0.04
%/V
Load Regulation
Tj = 25˚C, 10 mA ≤ IOUT ≤ IMAX
Tj = 25˚C, 10 ms Pulse
0.3
0.002
65
0.5
0.02
100
5
0.3
0.003
65
1.0
0.04
100
5
%
%/W
µA
Thermal Regulation
Adjustment Pin Current
Adjustment Pin Current Charge
10 mA ≤ IL ≤ IMAX
2
2
µA
3.0V ≤ |VIN − VOUT| ≤ 40V,
TA = 25˚C
Reference Voltage
Tj = 25˚C (Note 3)
−1.225 −1.250 −1.275 −1.213 −1.250 −1.287
−1.200 −1.250 −1.300 −1.200 −1.250 −1.300
V
V
3V ≤ |VIN − VOUT| ≤ 40V, (Note 3)
10 mA ≤ IOUT ≤ IMAX, P ≤ PMAX
3V ≤ |VIN − VOUT| ≤ 40V, (Note 2)
10 mA ≤ IOUT ≤ IMAX, (Note 2)
TMIN ≤ Tj ≤ TMAX
Line Regulation
0.02
0.3
0.6
2.5
1.2
0.05
1
0.02
0.3
0.6
2.5
1.5
0.07
1.5
%/V
%
Load Regulation
Temperature Stability
Minimum Load Current
%
|VIN − VOUT| ≤ 40V
5
3
10
6
mA
mA
|VIN − VOUT| ≤ 10V
Current Limit
|VIN − VOUT| ≤ 15V
K, MP and T Package
H Package
1.5
0.5
2.2
0.8
3.5
1.8
1.5
0.5
2.2
0.8
3.7
1.9
A
A
|VIN − VOUT| = 40V, Tj = 25˚C
K, MP and T Package
H Package
0.24
0.15
0.4
0.17
0.003
60
0.15
0.10
0.4
0.17
0.003
60
A
A
RMS Output Noise, % of VOUT
Ripple Rejection Ratio
Tj = 25˚C, 10 Hz ≤ f ≤ 10 kHz
VOUT = −10V, f = 120 Hz
CADJ = 10 µF
%
dB
66
77
66
77
dB
Long-Term Stability
Tj = 125˚C, 1000 Hours
0.3
1
15
3
0.3
12
1
15
3
%
Thermal Resistance, Junction to H Package
12
˚C/W
˚C/W
˚C/W
˚C/W
˚C/W
˚C/W
˚C/W
Case
K Package
T Package
2.3
2.3
4
Thermal Resistance, Junction to H Package
140
35
140
35
Ambient (No Heat Sink)
K Package
T Package
MP Package
50
170
Note 1: Unless otherwise specified, these specifications apply −55˚C ≤ T ≤ +150˚C for the LM137, 0˚C ≤ T ≤ +125˚C for the LM337; V − V
= 5V; and I
OUT
j
j
IN
OUT
= 0.1A for the TO-39 package and I
= 0.5A for the TO-3, SOT-223 and TO-220 packages. Although power dissipation is internally limited, these specifications
OUT
are applicable for power dissipations of 2W for the TO-39 and SOT-223 (see Application Hints), and 20W for the TO-3, and TO-220. I
SOT-223 and TO-220 packages, and 0.2A for the TO-39 package.
is 1.5A for the TO-3,
MAX
Note 2: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are
covered under the specification for thermal regulation. Load regulation is measured on the output pin at a point 1
⁄ " below the base of the TO-3 and TO-39 packages.
8
Note 3: Selected devices with tightened tolerance reference voltage available.
www.national.com
2
Electrical Characteristics (Note 1) (Continued)
Note 4: Refer to RETS137H drawing for LM137H or RETS137K drawing for LM137K military specifications.
Schematic Diagram
00906702
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 es-
pecially severe since power dissipation is large. Thermal
regulation 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
independent of electrical regulation or temperature coeffi-
cient, and occurs within 5 ms to 50 ms after a change in
power dissipation. Thermal regulation depends on IC layout
as well as electrical design. The thermal regulation of a
voltage regulator is defined as the percentage change of
00906703
LM137, V
= −10V
OUT
VOUT, per Watt, within the first 10 ms after a step of power is
applied. The LM137’s specification is 0.02%/W, max.
V
IN
− V
= −40V
OUT
→
→
0A
I
IL
= 0A
0.25A
Vertical sensitivity, 5 mV/div
FIGURE 1.
3
www.national.com
ended, the thermal regulation again shows a 3 mV step at
the LM137 chip cools off. Note that the load regulation error
of about 8 mV (0.08%) is additional to the thermal regulation
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).
Thermal Regulation (Continued)
In Figure 1, a typical LM137’s output drifts only 3 mV (or
0.03% of VOUT = −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
00906704
LM137, V
= −10V
OUT
V
IN
− V
= −40V
OUT
→
→
0A
I
L
= 0A
0.25A
Horizontal sensitivity, 20 ms/div
FIGURE 2.
Connection Diagrams
TO-3
TO-39
Metal Can Package
Metal Can Package
00906706
Case Is Input
Note 5: See STD Mil DWG 5962P99517 for Radiation Tolerant Devices
00906705
Bottom View
Case is Input
Order Number LM137H, LM137H/883 or LM337H
LM137HPQML and LM137HPQMLV(Note 5)
See NS Package Number H03A
Bottom View
Order Number LM137K/883
LM137KPQML and LM137KPQMLV(Note 5)
See NS Package Number K02C
Order Number LM337K STEEL
See NS Package Number K02A
www.national.com
4
Connection Diagrams (Continued)
TO-220
Plastic Package
3-Lead SOT-223
Front View
00906734
Order Number LM337IMP
Package Marked N02A See NS Package Number MP04A
00906707
Front View
Order Number LM337T
See NS Package Number T03B
Application Hints
When a value for θ(H−A) is found using the equation shown,
a heatsink must be selected that has a value that is less than
or equal to this number.
HEATSINKING SOT-223 PACKAGE PARTS
The SOT-223 (“MP”) packages use a copper plane on the
PCB and the PCB itself as a heatsink. To optimize the heat
sinking ability of the plane and PCB, solder the tab of the
package to the plane.
Figures 3, 4 show the information for the SOT-223 package.
Figure 4 assumes a θ(J−A) of 75˚C/W for 1 ounce copper and
51˚C/W for 2 ounce copper and a maximum junction tem-
perature of 125˚C.
00906733
FIGURE 4. Maximum Power Dissipation vs. TAMB for
the SOT-223 Package
Please see AN1028 for power enhancement techniques to
be used with the SOT-223 package.
00906732
FIGURE 3. θ(J−A) vs Copper (2 ounce) Area for the
SOT-223 Package
5
www.national.com
Typical Applications
−5.2V Regulator with Electronic Shutdown*
Adjustable Lab Voltage Regulator
00906710
*Minimum output . −1.3V when control input is low
Adjustable Current Regulator
00906709
Full output current not available
at high input-output voltages
*The 10 µF capacitors are optional to improve ripple rejection
Current Regulator
00906712
High Stability −10V Regulator
00906711
Negative Regulator with Protection Diodes
00906714
00906713
*When C is larger than 20 µF, D1 protects the LM137 in case the input
L
supply is shorted
**When C2 is larger than 10 µF and −V
is larger than −25V, D2
OUT
protects the LM137 in case the output is shorted
www.national.com
6
Typical Performance Characteristics (K Steel and T Packages)
Load Regulation
Current Limit
00906716
00906717
Adjustment Current
Dropout Voltage
00906718
00906719
Temperature Stability
Minimum Operating Current
00906720
00906721
7
www.national.com
Typical Performance Characteristics (K Steel and T Packages) (Continued)
Ripple Rejection
Ripple Rejection
00906722
00906723
00906725
00906727
Ripple Rejection
Output Impedance
00906724
Line Transient Response
Load Transient Response
00906726
www.national.com
8
Physical Dimensions inches (millimeters)
unless otherwise noted
Metal Can Package (H)
Order Number LM137H, LM137H/883 or LM337H
NS Package Number H03A
9
www.national.com
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Metal Can Package (K)
Order Number LM337K STEEL
NS Package Number K02A
Mil-Aero Metal Can Package (K)
Order Number LM137K/883
NS Package Number K02C
www.national.com
10
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
3-Lead SOT-223 Package
Order Number LM337IMP
NS Package Number MP04A
11
www.national.com
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
TO-220 Plastic Package (T)
Order Number LM337T
NS Package Number T03B
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.
For the most current product information visit us at www.national.com.
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and whose failure to perform when
properly used in 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 safety or effectiveness.
BANNED SUBSTANCE COMPLIANCE
National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship
Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned
Substances’’ as defined in CSP-9-111S2.
National Semiconductor
Americas Customer
Support Center
National Semiconductor
Europe Customer Support Center
Fax: +49 (0) 180-530 85 86
National Semiconductor
Asia Pacific Customer
Support Center
National Semiconductor
Japan Customer Support Center
Fax: 81-3-5639-7507
Email: new.feedback@nsc.com
Tel: 1-800-272-9959
Email: europe.support@nsc.com
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
Email: ap.support@nsc.com
Email: jpn.feedback@nsc.com
Tel: 81-3-5639-7560
www.national.com
相关型号：
©2020 ICPDF网 联系我们和版权申明