COM137T (COTS) COMMERCIAL OFF-THE-SHELF 1.5 AMP NEGATIVE, ADJUSTABLE VOLTAGE REGULATOR IN TO-257 PKG Three Terminal, Precision Adjustable Negative Voltage Regulator In TO-257 Package FEATURES • Built In Thermal Overload Protection • Short Circuit Current Limiting DESCRIPTION These three terminal negative regulators are supplied in hermetically sealed packages. All protective features are designed into the circuit, including thermal shutdown, current-limiting, and safe-area control. With heat sinking, these devices can deliver up to 1.5 amps of output current. The unit also features output voltages that can be fixed from -1.2 volts to -37 volts using external resistors. ABSOLUTE MAXIMUM RATINGS Tc @ 25°C Power Dissipation TO-257................... ...... .... ........................... . 20 W Input - Output Voltage Differential.................................... 40 V Operating Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . - 55°C to + 150°C Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 65°C to + 150°C Lead Temperature (Soldering 10 seconds) . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 300°C Thermal Resistance, Junction to Case: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2°C/W Maximum Output Current: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 A Recommended Operating Conditions: Output Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-1.2 to 37 VDC Ambient Operating Temperature Range (TA ) . . . . . . . . . . . . . . . . . . - 55°C to + 125°C Input Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -4.25 to -41.25 3.3 - 1 3.3 COM137T ELECTRICAL CHARACTERISTICS -55°C TA 125°C, IL = 8mA (unless otherwise specified) Parameter Symbol Test Conditions Reference Voltage V REF V DIFF Œ= 3.0V, TA = 25°C • V DIFF Œ= 3.0V Line Regulation R LINE 3.0 V (Note 1) Load Regulation R LOAD (Note 1) V DIFF Œ V DIFF Œ= 5.0V, 8mA V DIFF Œ= 12V, 8mA V DIFF Œ= 40V, 8mA IL IL IL V RTH 1.5A -1.20 • -1.30 -1.20 -9 9 • • -23 23 -25 25 -25 25 -25 25 -25 25 -5 5 200mA, TA = 25°C IL 100mA -1.225 -1.225 1.5A, TA = 25°C V DIFF Œ= 40V, 8mA Thermal Regulation 40V -1.275 -1.275 V DIFF Œ 40V, TA = 25°C 3.0 V Max. -1.30 V DIFF Œ= 40V, TA = 25°C V DIFF Œ= 40V Min. • V in = -14.6V, IL = 1.5A Unit V mV mV mV P d = 20 Watts, t = 10 ms, TA = 25°C Ripple Rejection RN f = 120 Hz, Vout = Vref (Note 2) • 66 dB C Adj = 10 µF Adjustment Pin Current IAdj V DIFF Œ= 3.0V V DIFF Œ= 40V Adjustment Pin I ³Adj (Line) Current Change I ³Adj (Load) Miminum Load Current ILmin 3.0V V DIFF Œ V DIFF Œ= 5V, 8mA 40V IL 1.5A V DIFF Œ= 3.0V, Vout = -1.4V (forced) V DIFF Œ= 10V, Vout = -1.4V (forced) V DIFF Œ= 40V, Vout = -1.4V (forced) Current Limit ICL V DIFF Œ (Note 2) 5V V DIFF Œ= 40V, TA = 25°C • • • • • • • • 100 100 µA -5 5 µA -5 5 µA 3.0 3.0 mA 5.0 1.5 3.5 0.24 1.2 A Notes: 1. Load and Line Regulation are specified at a constant junction temperature. Pulse testing with low duty cycle is used. Changes in output voltage due to heating effects must be taken into account separately. 2. If not tested, shall be guaranteed to the specified limits. 3. The •denotes the specifications which apply over the full operating temperature range. MECHANICAL OUTLINE TO-257AA 3.3 PIN CONNECTION .200 .190 .420 .410 .045 .035 .665 .645 .150 .140 .537 .527 Isolated Pin 1: Adjust Pin 2: Input Pin 3: Output Tab: Isolated .430 .410 .038 MAX. .750 .500 .005 1 2 3 .035 .025 .100 TYP. .120 TYP. 205 Crawford Street, Leominster, MA 01453 USA (978) 534-5776 FAX (978) 537-4246