MICROCIRCUIT DATA SHEET Original Creation Date: 07/12/95 Last Update Date: 05/06/97 Last Major Revision Date: 07/12/95 MDLM137-K REV 0A0 NEGATIVE ADJUSTABLE VOLTAGE REGULATOR General Description The LM137K is an adjustable 3-terminal negative voltage regulator capable of supplying in excess of -1.5A over an output voltage range of -1.2V to -37V. This regulator is 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 LM137K features internal current limiting, thermal shutdown, and safe-area compensation, making it virtually blow-out proof against overloads. The LM137K serves a wide variety of applications including local on-card regulation, programmable-output voltage regulation or precision current regulation. The LM137K is an ideal complement to the LM117K adjustable positive regulator. Industry Part Number NS Part Numbers LM137 LM137K-SMD* Prime Die LM137 Controlling Document 7703403YA* Processing Subgrp Description MIL-STD-883, Method 5004 1 2 3 4 5 6 7 8A 8B 9 10 11 Quality Conformance Inspection MIL-STD-883, Method 5005 1 Static tests at Static tests at Static tests at Dynamic tests at Dynamic tests at Dynamic tests at Functional tests at Functional tests at Functional tests at Switching tests at Switching tests at Switching tests at Temp ( oC) +25 +125 -55 +25 +125 -55 +25 +125 -55 +25 +125 -55 MICROCIRCUIT DATA SHEET MDLM137-K REV 0A0 Features - 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%. 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. Standard 3-lead transistor package. Output is short circuit protected. 2 MICROCIRCUIT DATA SHEET MDLM137-K REV 0A0 (Absolute Maximum Ratings) (Note 1) Power Dissipation (Note 2) Internally Limited Input-Output Voltage Differential 40V Operating Ambient Temperature -55 C to +125 C Maximum Junction Temperature 150 C Storage Temperature -65 C to +150 C Lead Temperature (Soldering, 10 seconds) ESD Rating 300 C 2K Volts Note 1: Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. The maximum power dissipation must be derated at elevated temperatures and is dictated by Tjmax (maximum junction temperature), ThetaJA (package junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is Pdmax = (Tjmax - TA)/ThetaJA or the number given in the Absolute Maximum Ratings, whichever is lower. 3 MICROCIRCUIT DATA SHEET MDLM137-K REV 0A0 Electrical Characteristics DC PARAMETERS (The following conditions apply to all the following parameters, unless otherwise specified.) DC: Il = 8mA SYMBOL PARAMETER Vref Reference Voltage CONDITIONS NOTES Vdiff = 3V Vdiff = 40V Rline Line Regulation Rload Load Regulation PINNAME MIN MAX UNIT SUBGROUPS -1.275 -1.225 V 1 -1.3 2, 3 -1.2 V -1.275 -1.225 V 1 -1.3 -1.2 V 2, 3 3V < Vdiff < 40V -9 9 mV 1 3V < Vdiff < 40V -23 23 mV 2, 3 Vdiff = 5V, 8mA < Il < 1.5A -25 25 mV 1, 2, 3 Vdiff = 12V, 8mA < Il < 1.5A -25 25 mV 1 Vdiff = 40V, 8mA < Il < 200mA -25 25 mV 1 Vdiff = 40V, 8mA < Il < 100mA -25 25 mV 2, 3 -5 5 mV 1 Vrth Thermal Regulation Vin = -14.6V, Il = 1.5A, Pd = 20W, t = 10mS Iadj Adjustment Pin Current Vdiff = 3V 100 uA 1, 2, 3 Vdiff = 40V 100 uA 1, 2, 3 Delta Iadj(line) Adjustment Pin Current Change 3V < Vdiff < 40V -5 5 uA 1, 2, 3 Delta Iadj(load) Adjustment Pin Current Change Vdiff = 5V, 8mA < Il < 1.5A -5 5 uA 1, 2, 3 Ilmin Minimum Load Vdiff = 3V, Vout = -1.4V (forced) 3 mA 1, 2, 3 Vdiff = 10V, Vout = -1.4V (forced) 3 mA 1, 2, 3 Vdiff = 40V, Vout = -1.4V (forced) 5 mA 1, 2, 3 Icl Current Limit Vdiff < 5V 1.5 3.5 A 1, 2, 3 Vdiff < 40V 0.24 1.2 A 1 dB 4, 5, 6 AC PARAMETERS (The following conditions apply to all the following parameters, unless otherwise specified.) AC: Il = 8mA Rn Ripple Rejection Note 1: Note 2: f = 120Hz, Cadj = 10uF, Vout = Vref Group "A" sample only, test at all temps. Bench test, refer to (SG)RPI-3-362. 4 1, 2 66