View LM13708_4916461.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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 0.01 %/V typical line regulation Current limit constant with temperature Ripple rejection: 77 dB Standard 3-lead transistor packages Excellent thermal regulation: 0.002 %/V 50 ppm/C temperature coefficient
TO-220 TO-3
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
Part numbers LM137 LM337 Order codes LM137K LM337K Temperature range -55 C to 150 C 0 C to 125 C
July 2008
Rev 3
1/18
www.st.com 18
Contents
LM137 - LM337
Contents
1 2 3 4 5 6 7 8 9 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Thermal regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2/18
LM137 - LM337
Diagram
1
Figure 1.
Diagram
Schematic diagram
3/18
Pin configuration
LM137 - LM337
2
Figure 2.
Pin configuration
Pin connections (top view)
TO-220
TO-3
4/18
LM137 - LM337
Maximum ratings
3
Table 2.
Symbol VI - VO IO PD TSTG TOP
Maximum ratings
Absolute maximum ratings
Parameter Input output voltage differential Output current Power dissipation Storage temperature range LM137 Operating junction temperature range LM337 0 to 125 Value 40 1.5 Internally limited - 65 to 150 - 55 to 150 C C Unit V A
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Thermal data
Parameter Thermal resistance junction-case max. Thermal resistance junction-ambient max. TO-220 3 70 TO-3 4 35 Unit C/W C/W
Table 3.
Symbol RthJC RthJA
5/18
Electrical characteristics
LM137 - LM337
4
Table 4.
Symbol
Electrical characteristics
Electrical characteristics of LM137 (TJ = -55 to 150 C, VI - VO = 5 V, IO = 0.5 A unless otherwise specified) (1)
Parameter Ta = 25C Test conditions Min. -1.225 -1.2 Typ. -1.25 -1.25 0.01 0.01 15 0.3 0.002 65 Ta = 25C, |IO| = 10 mA to |IO(max)| |VI - VO| = 3 to 40 V |VI - VO| = 3 to 40 V |IO| = 10mA to |IO(max)| |VI - VO| 40 V |VI - VO| 10 V |VI - VO| 15 V |VI - VO| = 40 V, TJ =25C RMS output noise (% of VO) Ripple rejection ratio Temperature stability Long term stability Ta = 125C, 1000 H Ta = 25C, f = 10 Hz to 10 kHz VO = -10 V, f = 120 Hz CADJ = 10 F 66 1.5 0.24 |VO| 5 V |VO| 5 V 2 0.02 20 0.3 2.5 1.2 2.2 A 0.4 0.003 60 dB 77 0.6 0.3 1 % % % Max. -1.275 V -1.3 0.02 %/V 0.02 25 0.5 0.02 100 5 0.05 50 1 5 mA 3 mV % %/W A A %/V mV % Unit
VREF
Reference voltage
|VI - VO| = 3 to 40 V, TJ = Tmin to Tmax |IO| = 10mA to |IO(max)| P Pmax Ta = 25C |VI - VO| = 3 to 40 V Ta = 25C |IO| = 10mA to |IO(max)| Ta = 25C, pulse 10 ms IO = 0.1 A IO = 20 mA |VO| 5 V |VO| 5 V
KVI
Line regulation (2)
KVO
Load regulation (2) Thermal regulation
IADJ IADJ KVI KVO
Adjustment pin current Adjustment pin current change Line regulation (2) Load regulation (2)
|IO(min)| Minimum load current
IOS VNO RVF KVT KVH
Short circuit output current
1. Although power dissipation is internally limited, these specifications are applicable for power dissipation of: 15 W for TO-220 and 20 W for TO-3 Package; IO(max) is 1.5 A 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.
6/18
LM137 - LM337 Table 5.
Symbol
Electrical characteristics
Electrical characteristics of LM337 (TJ = 0 to 150 C unless otherwise specified). (1)
Parameter Ta = 25C Test conditions Min. -1.213 -1.2 Typ. -1.25 -1.25 0.01 0.01 15 0.3 0.003 65 Ta = 25C, |IO| = 10 mA to |IO(max)| |VI - VO| = 3 to 40 V |VI - VO| = 3 to 40 V |IO| = 10mA to |IO(max)| |VI - VO| 40 V |VI - VO| 10 V |VI - VO| 15 V |VI - VO| = 40 V, TJ =2 5C RMS output noise (% of VO) Ripple rejection ratio Temperature stability Long term stability Ta = 125C, 1000 H Ta = 25C, f = 10 Hz to 10 kHz VO = -10 V, f = 120 Hz CADJ = 10 F 66 1.5 0.15 |VO| 5 V |VO| 5 V 2 0.02 20 0.3 2.5 1.5 2.2 A 0.4 0.003 60 dB 77 0.6 0.3 1 % % % Max. -1.287 V -1.3 0.04 %/V 0.04 50 1 0.04 100 5 0.07 70 1.5 10 mA 6 mV % %/W A A %/V mV % Unit
VREF
Reference voltage
|VI - VO| = 3 to 40 V, TJ = Tmin to Tmax |IO| = 10mA to |IO(max)|, P Pmax Ta = 25C |VI - VO| = 3 to 40 V Ta = 25C |IO| = 10mA to |IO(max)| Ta = 25C, pulse 10 ms IO = 0.1 A IO = 20 mA |VO| 5 V |VO| 5 V
KVI
Line regulation (2)
KVO
Load regulation (2) Thermal regulation
IADJ IADJ KVI KVO
Adjustment pin current Adjustment pin current change Line regulation (2) Load regulation (2)
|IO(min)| Minimum load current
IOS VNO RVF KVT KVH
Short circuit output current
1. Although power dissipation is internally limited, these specifications are applicable for power dissipation of: 15 W for TO-220 and 20 W for TO-3 package; IO(max) is 1.5 A. 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.
7/18
Typical characteristics
LM137 - LM337
5
Figure 3.
Typical characteristics
Load regulation Figure 4. Current limit
Figure 5.
Adjustment current
Figure 6.
Dropout voltage
Figure 7.
Temperature stability
Figure 8.
Minimum operating current
8/18
LM137 - LM337
Typical characteristics
Figure 9.
Ripple rejection vs output voltage
Figure 10. Ripple rejection vs frequency
Figure 11. Ripple rejection vs output current
Figure 12. Output impedance
Figure 13. Line transient response
Figure 14. Load transient response
9/18
Thermal regulation
LM137 - LM337
6
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 VO, per watt, within the first 10ms after a step of power, is applied. The LM137 specification is 0.02 %/W max. In Figure 1, a typical LM337's output drifts only 3 mV for 0.03% of VO = - 10 V) when a 10 W pulse is applied for 10 ms. This performance is thus well inside the specification limit of 0.02 %/W x 10 W = 0.2% max. When the 10 W pulse is ended the thermal regulation again shows a 3 mV step as 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 10 W 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).
10/18
LM137 - LM337
Typical application
7
Typical application
Figure 15. Adjustable negative voltage regulator
* C1 = 1 F solid tantalum or 10F aluminium electrolytic required for stability. ** C2 = 1 F solid tantalum is required only if regulator is more than 10 cm from power supply filter capacitors
Figure 16. Adjustable lab voltage regulator
* The 10 F capacitors are optimal to improve ripple rejection.
11/18
Typical application
LM137 - LM337
Figure 17. Current regulator
Figure 18. Negative regulator with protection diodes
* When CL is larger than 20 F, D1 protects the LM137 in case the input supply is shorted. ** When C2 is larger than 10 F and VO is larger than - 25 V, D2 protects the LM137 in case the output is shorted.
12/18
LM137 - LM337
Typical application
Figure 19. - 5.2 V regulator with electronic shutdown (1)
1. Minimum output = - 1.3 V when control input is low.
Figure 20. Current regulator
13/18
Package mechanical data
LM137 - LM337
8
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
14/18
LM137 - LM337
Package mechanical data
TO-220 mechanical data
Dim. A C D D1 E F F1 F2 G G1 H2 L2 L4 L5 L6 L7 L9 DIA. 13.0 2.65 15.25 6.2 3.5 3.75 0.49 0.61 1.14 1.14 4.95 2.4 10.0 16.4 14.0 2.95 15.75 6.6 3.93 3.85 0.511 0.104 0.600 0.244 0.137 0.147 mm. Min. 4.40 1.23 2.40 1.27 0.70 0.88 1.70 1.70 5.15 2.7 10.40 0.019 0.024 0.044 0.044 0.194 0.094 0.393 0.645 0.551 0.116 0.620 0.260 0.154 0.151 Typ. Max. 4.60 1.32 2.72 Min. 0.173 0.048 0.094 0.050 0.027 0.034 0.067 0.067 0.203 0.106 0.409 inch. Typ. Max. 0.181 0.051 0.107
P011C
15/18
Package mechanical data
LM137 - LM337
TO-3 mechanical data
Dim. A B C D E G N P R U V 30.10 3.88 10.9 16.9 26.2 4.09 39.5 1.185 0.152 0.96 mm. Min. Typ. 11.85 1.05 1.10 1.70 8.7 20.0 0.429 0.665 1.031 0.161 1.555 0.037 Max. Min. inch. Typ. 0.466 0.041 0.043 0.066 0.342 0.787 Max.
P G
A
D C
U
V
O
N
R
P003C/C
16/18
B
E
LM137 - LM337
Revision history
9
Table 6.
Date
Revision history
Document revision history
Revision 1 2 3 First issue. Modified pin connection for TO-3. Added: Table 1 on page 1. Changes
19-Jul-2004 10-Jan-2005 17-Jul-2008
17/18
LM137 - LM337
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein.
UNLESS OTHERWISE SET FORTH IN ST'S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER'S OWN RISK.
Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST.
ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.
(c) 2008 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com
18/18

▲Up To Search▲

Price & Availability of LM13708

	To Download LM13708 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .