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Details, datasheet, quote on part number:JL137SXA
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| Part: | JL137SXA |
| Category: | Power Management => Regulators => Linear Voltage Regulators => Negative => Adjustable |
| Description: | LM137 - 3-Terminal Adjustable Negative Regulator, Package: TO-39, Pin Nb=3 |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download JL137SXA datasheet File size : 432 kB |
| Request For quote: | Find where to buy JL137SXA
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Datasheet text preview:
LM137/LM337 3-Terminal Adjustable Negative Regulators
November 2001
LM137/LM337 3-Terminal Adjustable Negative Regulators
General Description
The LM137/LM337 are adjustable 3-terminal negative voltage 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 optimized 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. The LM137/LM337 serve a wide variety of applications including local on-card regulation, programmable-output voltage regulation or precision current regulation. The LM137/ LM337 are ideal complements to the LM117/LM317 adjustable positive regulators. n n n n n n n n n Excellent thermal regulation, 0.002%/W 77 dB ripple rejection Excellent rejection of thermal transients 50 ppm/°C temperature coefficient Temperature-independent current limit Internal thermal overload protection P+ Product Enhancement tested Standard 3-lead transistor package Output is short circuit protected LM137 Series Packages and Power Capability Rated Device LM137/337 Package TO-3 (K) TO-39 (H) LM337 LM337 TO-220 (T) SOT-223 (MP) Power Dissipation 20W 2W 15W 2W Design Load Current 1.5A 0.5A 1.5A 1A
Features
n n n n Output voltage adjustable from -1.2V to -37V 1.5A output current guaranteed, -55°C to +150°C Line regulation typically 0.01%/V Load regulation typically 0.3%
Typical Applications
Adjustable Negative Voltage Regulator
Comparison between SOT-223 and D-Pak (TO-252) Packages
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
© 2001 National Semiconductor Corporation
DS009067
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LM137/LM337
Absolute Maximum Ratings
4)
(Notes 1,
LM337 LM337I Storage Temperature Lead Temperature (Soldering, 10 sec.) Plastic Package (Soldering, 4 sec.) ESD Rating
0°C to +125°C -40°C to +125°C -65°C to +150°C 300°C 260°C 2k Volts
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Power Dissipation Input-Output Voltage Differential Operating Junction Temperature Range LM137 Internally Limited 40V
-55°C to +150°C
Electrical Characteristics (Note 1)
Parameter Line Regulation Load Regulation Thermal Regulation Adjustment Pin Current Adjustment Pin Current Charge 10 mA IL IMAX 3.0V |VIN - VOUT| 40V, TA = 25°C Reference Voltage Tj = 25°C (Note 3) 3V |VIN - VOUT| 40V, (Note 3) 10 mA IOUT IMAX, P PMAX Line Regulation Load Regulation Temperature Stability Minimum Load Current Current Limit 3V |VIN - VOUT| 40V, (Note 2) 10 mA IOUT IMAX, (Note 2) TMIN Tj TMAX |VIN - VOUT| 40V |VIN - VOUT| 10V |VIN - VOUT| 15V K, MP and T Package H Package |VIN - VOUT| = 40V, Tj = 25°C K, MP and T Package H Package RMS Output Noise, % of VOUT Ripple Rejection Ratio Long-Term Stability Thermal Resistance, Junction to Case Thermal Resistance, Junction to Ambient (No Heat Sink) Tj = 25°C, 10 Hz f 10 kHz VOUT = -10V, f = 120 Hz CADJ = 10 µF Tj = 125°C, 1000 Hours H Package K Package T Package H Package K Package T Package MP Package 140 35 66 0.24 0.15 0.4 0.17 0.003 60 77 0.3 12 2.3 1 15 3 66 0.15 0.10 0.4 0.17 0.003 60 77 0.3 12 2.3 4 140 35 50 170 1 15 3 A A % dB dB % °C/W °C/W °C/W °C/W °C/W °C/W °C/W 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 0.02 0.3 0.6 2.5 1.2 5 3 0.05 1 0.02 0.3 0.6 2.5 1.5 10 6 0.07 1.5 %/V % % mA mA -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 Conditions Min Tj = 25°C, 3V |VIN - VOUT| 40V (Note 2) IL = 10 mA Tj = 25°C, 10 mA IOUT IMAX Tj = 25°C, 10 ms Pulse 0.3 0.002 65 2 0.5 0.02 100 5 0.3 0.003 65 2 1.0 0.04 100 5 % %/W µA µA LM137 Typ 0.01 Max 0.02 Min LM337 Typ 0.01 Max 0.04 %/V Units
Note 1: Unless otherwise specified, these specifications apply -55°C Tj +150°C for the LM137, 0°C Tj +125°C for the LM337; VIN - VOUT = 5V; and IOUT = 0.1A for the TO-39 package and IOUT = 0.5A for the TO-3, SOT-223 and TO-220 packages. Although power dissipation is internally limited, these specifications 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. IMAX is 1.5A for the TO-3, SOT-223 and TO-220 packages, and 0.2A for the TO-39 package. 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 1/8" below the base of the TO-3 and TO-39 packages.
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LM137/LM337
Electrical Characteristics (Note 1) Schematic Diagram
(Continued)
Note 3: Selected devices with tightened tolerance reference voltage available. Note 4: Refer to RETS137H drawing for LM137H or RETS137K drawing for LM137K military specifications.
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 especially 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 coefficient, 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 VOUT, per Watt, within the first 10 ms after a step of power is applied. The LM137's specification is 0.02%/W, max.
00906703
LM137, VOUT = -10V VIN - VOUT = -40V IIL = 0A 0.25A 0A Vertical sensitivity, 5 mV/div
FIGURE 1.
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LM137/LM337
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 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).
00906704
LM137, VOUT = -10V VIN - VOUT = -40V IL = 0A 0.25A 0A Horizontal sensitivity, 20 ms/div
FIGURE 2.
Connection Diagrams
TO-3 Metal Can Package TO-220 Plastic Package
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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
Case is Input
TO-39 Metal Can Package
00906707
Front View Order Number LM337T See NS Package Number T03B 3-Lead SOT-223
00906706
Bottom View Order Number LM137H, LM137H/883 or LM337H LM137HPQML and LM137HPQMLV(Note 5) See NS Package Number H03A
Case Is Input Note 5: See STD Mil DWG 5962P99517 for Radiation Tolerant Devices
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Front View Order Number LM337IMP Package Marked N02ASee NS Package Number MA04A
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LM137/LM337
Application Hints
When a value for (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.
Typical Applications
Adjustable Lab Voltage Regulator
Figures 3, 4 show the information for the SOT-223 package. Figure 4 assumes a (J-A) of 75°C/W for 1 ounce copper and 51°C/W for 2 ounce copper and a maximum junction temperature of 125°C.
00906709
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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FIGURE 3. (J-A) vs Copper (2 ounce) Area for the SOT-223 Package
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Negative Regulator with Protection Diodes
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.
supply is shorted
**When C2 is larger than 10 µF and -VOUT is larger than -25V, D2 protects the LM137 in case the output is shorted
00906713
*When CL is larger than 20 µF, D1 protects the LM137 in case the input
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