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NEGATIVE ADJUSTABLE VOLTAGE REGULATOR
IP137SMD / IP137ASMD / IP137HVSMD / IP137AHVSMD / LM137SMD LM137ASMD LM137HVSMD LM137AHVSMD
FEATURES
* * * * * 1.5A Output Current Guaranteed Internal Thermal Overload Protection Output Short Circuit Protected Hermetic Ceramic Surface Mount Package Screening Options Available
APPLICATIONS
* * * Adjustable Power Supplies System Power Supplies Precision Voltage / Current Regulators
DESCRIPTION
The 137 Series regulators are adjustable 3 terminal voltage regulators capable of supplying in excess of -1.5A over an output voltage range of -1.2V to -37V (HV Series, -47V). The regulators are exceptionally easy to apply requiring only 2 external resistors to set the output voltage and 1 output capacitor for frequency compensation. Every effort has been made to make these devices easy to use and difficult to damage. Internal current limiting and power limiting coupled with true thermal limiting prevents damage due to overloads or shorts, even if the regulators are not fastened to a heat sink.
ABSOLUTE MAXIMUM RATINGS (TC = 25C unless otherwise stated)
VI - VO IO PD TJ Tstg Input - Output Voltage Differential Standard HV Series Output Current Power Dissipation Operating Junction Temperature Range Storage Temperature Range 40V 50V Internally Limited Internally Limited -55 to +150C -65 to +150C
THERMAL PROPERTIES
Symbols
RJC
Parameters
Thermal Resistance, Junction To Case
Min.
Typ.
Max.
3.5
Units
C/W
** This datasheet supersedes document 2831
Semelab Limited reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is believed to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in its use. Semelab encourages customers to verify that datasheets are current before placing orders. Coventry Road, Lutterworth, Leicestershire, LE17 4JB Semelab Limited Telephone +44 (0) 1455 556565 Fax +44 (0) 1455 552612 Email: sales@semelab-tt.com Document Number 8211 Issue 2 Page 1 of 5
Website: http://www.semelab-tt.com
NEGATIVE ADJUSTABLE VOLTAGE REGULATOR
ELECTRICAL CHARACTERISTICS(1)(3) (TC = 25C unless otherwise stated)
LM137, IP137, LM137HV, IP137HV Symbols
VREF
Parameters
Reference Voltage
Test Conditions
IOUT = 10mA 10mA IOUT IMAX, P PMAX, 3V (VIN-VOUT) VMAX 3V (VIN-VOUT) VMAX, IOUT = 10mA VOUT 5V
Min.
-1.225
Typ
-1.250
Max.
-1.275
Units
V
* -1.200 -1.250
0.010
-1.300 0.020 0.050 25 0.5 50
1.0 0.02
VOUT VIN
Line Regulation (2)
*
%/V mV % mV
% %/W dB
0.020 15 0.3
VOUT IOUT
Load Regulation (2)(3)
10mA IOUT IMAX
VOUT 5V VOUT 5V
VOUT 5V
* *
20
0.3 0.002 60 66 77 65 0.5 2 3 2.5 1.2 1.5 0.24 0.2 2.2 0.4 0.4 0.6
0.3 0.003
Thermal Regulation Ripple Rejection IADJ Adjust Pin Current
VIN = -7.92V, IOUT = 1.5A, PD = 10W, TA = 25C, 10ms Pulse VOUT = -10V f = 120Hz CADJ = 0 CADJ = 10F *
*
10mA IOUT IMAX
100 5 5 6 5 3 3.2
A
* * * * * * * * *
IADJ
Adjust Pin Current Change
3V (VIN-VOUT) 40V 3V (VIN-VOUT) 50V (HV Series)
IMIN
Minimum Load Current
(VIN - VOUT) 40V (VIN - VOUT) 10V (VIN - VOUT) 15V
mA
ICL
Current Limit
(VIN - VOUT) = 40V (VIN - VOUT) = 50V (HV Series)
A 0.8
VOUT TEMP VOUT TIME
en
Temperature Stability
Long Term Stability RMS Output Noise (% of VOUT) TA = 125C, 1000Hrs TA = 25C, 10Hz f 10KHz
1.0
%
Notes The denotes the specifications which apply over the full operating temperature range. (1) (2) Test conditions unless otherwise stated: VIN - VOUT = 5V, IOUT = 0.5A, PMAX = 10W, IMAX = 1.5A Regulation is measured at constant junction temperature, using pulse testing at a low duty cycle. Changes in output voltage due to heating effects are covered under thermal regulation specifications. Load regulation is measured at the junction of the wide and narrow portion of the output lead. VMAX = 40V for LM137, IP137, LM137A, IP137A VMAX = 50V for LM137HV, IP137HV, LM137AHV, IP137AHV
(3)
Coventry Road, Lutterworth, Leicestershire, LE17 4JB Semelab Limited Telephone +44 (0) 1455 556565 Fax +44 (0) 1455 552612 Email: sales@semelab-tt.com
Website: http://www.semelab-tt.com
Document Number 8211 Issue 2 Page 2 of 5
NEGATIVE ADJUSTABLE VOLTAGE REGULATOR
ELECTRICAL CHARACTERISTICS(1)(3) (TC = 25C unless otherwise stated)
LM137A, IP137A, LM137AHV, IP137AHV Symbols
VREF
Parameters
Reference Voltage
Test Conditions
IOUT = 10mA 10mA IOUT IMAX, P PMAX, 3V (VIN-VOUT) VMAX 3V (VIN-VOUT) VMAX, IOUT = 10mA VOUT 5V
Min.
-1.238
Typ
-1.250
Max.
-1.262
Units
V
-1.220 -1.250
0.005
-1.280 0.010 0.030 25 0.5 50 1.0 0.02 mV % mV % %/W
VOUT VIN
Line Regulation (2)
%/V
0.010 5 0.1
VOUT IOUT
Load Regulation (2)(3)
10mA IOUT IMAX
VOUT 5V VOUT 5V VOUT 5V

10 0.2 0.002 60 70 66 80 65 0.2 1.0 2 2.5 1.2 1.5 0.24 0.2 2.2 0.4 0.4 0.6 0.3 0.003
Thermal Regulation
VIN = -7.92V, IOUT = 1.5A, PD = 10W, TA = 25C, 10ms Pulse VOUT = -10V f = 120Hz CADJ = 0 CADJ = 10F
Ripple Rejection IADJ Adjust Pin Current
dB 100 2 5 6 5 3 3.2 1.0 0.8 1.5 1.0 % A mA A
10mA IOUT IMAX

IADJ
Adjust Pin Current Change
3V (VIN-VOUT) 40V 3V (VIN-VOUT) 50V (HV Series)
IMIN
Minimum Load Current
(VIN - VOUT) 40V (VIN - VOUT) 10V (VIN - VOUT) 15V
ICL
Current Limit
(VIN - VOUT) = 40V (VIN - VOUT) = 50V (HV Series)
VOUT TEMP VOUT TIME
en
Temperature Stability Long Term Stability RMS Output Noise (% of VOUT) TA = 125C, 1000Hrs TA = 25C, 10Hz f 10KHz
Notes The denotes the specifications which apply over the full operating temperature range. (1) (2) Test conditions unless otherwise stated: VIN - VOUT = 5V, IOUT = 0.5A, PMAX = 10W, IMAX = 1.5A Regulation is measured at constant junction temperature, using pulse testing at a low duty cycle. Changes in output voltage due to heating effects are covered under thermal regulation specifications. Load regulation is measured at the junction of the wide and narrow portion of the output lead. VMAX = 40V for LM137, IP137, LM137A, IP137A VMAX = 50V for LM137HV, IP137HV, LM137AHV, IP137AHV
(3)
Coventry Road, Lutterworth, Leicestershire, LE17 4JB Semelab Limited Telephone +44 (0) 1455 556565 Fax +44 (0) 1455 552612 Email: sales@semelab-tt.com
Website: http://www.semelab-tt.com
Document Number 8211 Issue 2 Page 3 of 5
NEGATIVE ADJUSTABLE VOLTAGE REGULATOR
APPLICATIONS INFORMATION
High Stability Regulator
The output stability, load regulation, line regulation, thermal regulation, temperature drift, long term drift, and noise, can be improved by a factor of 6.6 over the standard regulator configuration. This assumes a zener has 20PPM/C maximum drift and about 10 times lower noise than the regulator.
Multiple Tracking Regulators
In the application shown below, regulator #2 to "N" will track regulator #1 to within 24mV initially, and to 60mV over all load line, and temperature conditions. If any regulator output is shorted to ground, all other outputs will drop to -2V. Load regulation of regulators #2 to "N" will be improved by VOUT / 1.25V compared to a standard, so regulator #1 should be the one which has the lowest load current.
C3 10F
R2
*
2F
R2
7V
SOLID TANTALUM R1 1k 1% 1F
ADJ -VIN VIN V OUT REG #1
1N4002
C1 1F SOLID TANTALUM R1 120 -VOUT1
R3 1.5k 1% ADJ -V IN V IN V OUT
IP137 IP137
( VOUT ) - 908 * R2 = 9.08 x 10 -3 -V OUT
1F 2F
1N4002
IP137 IP137
ADJ V
IN
SOLID TANTALUM -VOUT2
V REG #2
OUT
IP137 IP137
Dual Tracking Supply
IP137 IP137
+V IN V IN ADJ R1** 100 1% V OUT +V
2F
1N4002
1F ADJ SOLID TANTALUM -VOUT N
OUT
V IN
V OUT REG #N
* 2.2 F
D1 1N4002
IP137 IP137
10F
R2 5k 1% R3 5k
Current Regulator
C1 1F SOLID TANATALUM V OUT RS 1.25 V RS I (+)
10F
R4 5k 1% 2.2 F *
R5** 100 1% ADJ -V IN VIN V OUT
ADJ
D2 1N4002
(-)
V IN
IP137 IP137
-VOUT
I = 65A +
0.8 R S 250
IP137 IP137
* Solid Tantalum ** R1 & R5 maybe trimmed slightly to improve tracking
Coventry Road, Lutterworth, Leicestershire, LE17 4JB Semelab Limited Telephone +44 (0) 1455 556565 Fax +44 (0) 1455 552612 Email: sales@semelab-tt.com
Website: http://www.semelab-tt.com
Document Number 8211 Issue 2 Page 4 of 5
NEGATIVE ADJUSTABLE VOLTAGE REGULATOR
MECHANICAL DATA
Dimensions in mm (inches)
0.89 (0.035) min. 3.70 (0.146) 3.41 (0.134) 3.70 (0.146) 3.41 (0.134) 3.60 (0.142) Max.
4.14 (0.163) 3.84 (0.151)
1
3
0.76 (0.030) min.
10.69 (0.421) 10.39 (0.409)
2
9.67 (0.381) 9.38 (0.369) 11.58 (0.456) 11.28 (0.444)
16.02 (0.631) 15.73 (0.619)
0.50 (0.020) 0.26 (0.010)
SMD1 (TO276AB) Pin 1 = ADJ. Pin 2 = VIN Pin 3 = VOUT
Coventry Road, Lutterworth, Leicestershire, LE17 4JB Semelab Limited Telephone +44 (0) 1455 556565 Fax +44 (0) 1455 552612 Email: sales@semelab-tt.com
Website: http://www.semelab-tt.com
Document Number 8211 Issue 2 Page 5 of 5

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