LM137
LM337
Three-terminal adjustable negative voltage regulators
Features
■Output voltage adjustable down to VREF
■1.5 A guaranteed output current
■ 0.3%/V typical load regulation |
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■ 0.01%/V typical line regulation |
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■ Current limit constant with temperature |
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■ Ripple rejection: 77 dB |
TO-220 |
TO-3 |
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■ Standard 3-lead transistor packages |
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■ Excellent thermal regulation: 0.002%/V |
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■ 50 ppm/°C temperature coefficient |
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Description
The LM137 series are adjustable 3-terminal negative voltage regulators capable of supplying in excess -1.5 A over a -1.2 to -37 V output voltage range. They are exceptionally easy to use and require only two external resistors to set the output voltage. Further, both line and load regulation are better than standard fixed regulators. Also, LM137 regulators are supplied in standard transistor packages which are easily mounted and handled. In addition to higher performance than fixed regulators, the LM137 series offer full overload protection available only in integrated circuits. Included on the chip are current limit, thermal overload protection and safe area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected.
Table 1. |
Device summary |
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Part numbers |
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Order codes |
Packages |
Temperature range |
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LM137 |
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LM137K |
TO-3 |
- 55 °C to 150 °C |
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LM337 |
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LM337K |
TO-3 |
0 °C to 125 °C |
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LM337 |
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LM337SP |
TO-220 |
0 °C to 125 °C |
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October 2011 |
Doc ID 2167 Rev 4 |
1/18 |
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www.st.com
Contents |
LM137, LM337 |
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Contents
1 |
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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2 |
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
4 |
3 |
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
5 |
4 |
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
6 |
5 |
Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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6 |
Thermal regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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7 |
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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8 |
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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9 |
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
17 |
2/18 |
Doc ID 2167 Rev 4 |
LM137, LM337 |
Diagram |
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Doc ID 2167 Rev 4 |
3/18 |
Pin configuration |
LM137, LM337 |
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TO-220 |
TO-3 |
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4/18 |
Doc ID 2167 Rev 4 |
LM137, LM337 |
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Maximum ratings |
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3 |
Maximum ratings |
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Table 2. |
Absolute maximum ratings |
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Symbol |
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Parameter |
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Value |
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Unit |
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VI - VO |
Input output voltage differential |
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40 |
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V |
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IO |
Output current |
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1.5 |
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A |
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PD |
Power dissipation |
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Internally limited |
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TSTG |
Storage temperature range |
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- 65 to 150 |
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°C |
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TOP |
Operating junction temperature range |
LM137 |
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- 55 to 150 |
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°C |
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LM337 |
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0 to 125 |
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Note: |
Absolute maximum ratings are those values beyond which damage to the device may occur. |
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Functional operation under these condition is not implied. |
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Table 3. |
Thermal data |
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Symbol |
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Parameter |
TO-220 |
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TO-3 |
Unit |
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RthJC |
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Thermal resistance junction-case max. |
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4 |
°C/W |
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RthJA |
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Thermal resistance junction-ambient max. |
70 |
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35 |
°C/W |
Doc ID 2167 Rev 4 |
5/18 |
Electrical characteristics |
LM137, LM337 |
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4 |
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Electrical characteristics |
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TJ = -55 to 150 °C, VI - VO = 5 V, IO = 0.5 A unless otherwise specified. |
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Table 4. |
Electrical characteristics of LM137 |
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Symbol |
Parameter |
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Test conditions |
Min. |
Typ. |
Max. |
Unit |
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Ta = 25°C |
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-1.225 |
-1.25 |
-1.275 |
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VREF |
Reference voltage |
|VI - VO| = 3 to 40 V, TJ = Tmin to Tmax |
-1.2 |
-1.25 |
-1.3 |
V |
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|IO| = 10mA to |IO(max)| P ≤ Pmax |
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K |
Line regulation (1) |
Ta = 25°C |
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IO = 0.1 A |
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0.01 |
0.02 |
%/V |
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VI |
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|VI - VO| = 3 to 40 V |
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IO = 20 mA |
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0.01 |
0.02 |
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KVO |
Load regulation (1) |
Ta = 25°C |
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|VO| ≤ 5 V |
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15 |
25 |
mV |
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|IO| = 10mA to |IO(max)| |
|VO| ≥ 5 V |
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0.3 |
0.5 |
% |
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Thermal regulation |
Ta = 25°C, pulse 10 ms |
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0.002 |
0.02 |
%/W |
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IADJ |
Adjustment pin current |
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65 |
100 |
µA |
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IADJ |
Adjustment pin current |
Ta = 25°C, |IO| = 10 mA to |IO(max)| |
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2 |
5 |
µA |
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change |
|VI - VO| = 3 to 40 V |
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K |
Line regulation (1) |
|V |
I |
- V | = 3 to 40 V |
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0.02 |
0.05 |
%/V |
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VI |
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O |
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K |
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Load regulation (1) |
|I |
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|VO| ≤ 5 V |
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20 |
50 |
mV |
VO |
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O |
O(max) |
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|VO| ≥ 5 V |
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0.3 |
1 |
% |
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|IO(min)| |
Minimum load current |
|VI - VO| ≤ 40 V |
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2.5 |
5 |
mA |
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|VI - VO| ≤ 10 V |
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1.2 |
3 |
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IOS |
Short circuit output current |
|VI - VO| ≤ 15 V |
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1.5 |
2.2 |
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A |
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|VI - VO| = 40 V, TJ =25°C |
0.24 |
0.4 |
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VNO |
RMS output noise |
Ta = 25°C, f = 10 Hz to 10 kHz |
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0.003 |
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(% of VO) |
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RVF |
Ripple rejection ratio |
VO = -10 V, f = 120 Hz |
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60 |
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dB |
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CADJ = 10 µF |
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66 |
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KVT |
Temperature stability |
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0.6 |
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KVH |
Long term stability |
Ta = 125°C, 1000 H |
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0.3 |
1 |
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1.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.
TJ = 0 to 150 °C unless otherwise specified.
6/18 |
Doc ID 2167 Rev 4 |