L4963W STMicroelectronics

L4963 L4963D 1.5A SWITCHING REGULATOR 1.5A OUTPUT LOAD CURRENT 5.1 TO 36V OUTPUT VOLTAGE RANGE DISCONTINUOUS VARIABLE FREQUENCY MODE PRECISE (+/2%) ON CHIP REFERENCE VERY HIGH EFFICIENCY VERY FEW EXTERNAL COMPONENTS NO FREQ. COMPENSATION REQUIRED RESET AND POWER FAIL OUTPUT FOR MI- CROPROCESSOR Powerdip12+3+3 SO20 INTERNAL CURRENT LIMITING THERMAL SHUTDOWN ORDERING NUMBERS: L4963W L4963D DESCRIPTION The L4963 is a monolithic power switching regulator delivering 1.5A at 5.1V. The output voltage is adjust- able from 5.1V to 36V, working in discontinuous variable frequency mode. Features of the device The L4963 is mounted in a 12+3+3 lead Powerdip include remote inhibit, internal current limiting and (L4963) and SO20 large (L4963D) plastic pack- thermal protection, reset and power fail outputs for ages and requires very few external components. microprocessor. BLOCK DIAGRAM June 2000 1/17 This is advanced information on a new product now in development or underogin evaluation. Details are subject to change without notice.L4963 - L4963D ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit SO20 Powerdip V i Input Voltage (pin 1 and pin 3 connected togheter) 47 V V V 3 2 Input to Output Voltage Difference 47 V V 2 Negative Output DC Voltage 1 V V 2 5 V Negative Output Peak Voltage at t=0.2 s, f=50kHz V 8 V Power Fail Input 25 V 7 V , V 9 11 V , V V 8 10 Reset and Power Fail Output i V 10 V Reset Delay Input 5.5 V 9 V , V 13 18 V , V Feedback and Inhibit Inputs 7V 12 16 V , V 19 20 V , V Oscillator Inputs 5.5 V 17 18 P Total Power Dissipation Tpins 90C (Power DIP) 5 W tot 1.3 W (T = 70C no copper area on PCB) amb 2 (T = 70 C, 4cm copper area on PCB) 2 W amb T , T Storage & Junction Temperature 40 to 150 C stg j 2 (Tamb = 70C 6cm copper area on PCB) 1.45 W P 4W Total Power Dissipation Tpins 90C (SO20L) tot PIN CONNECTION (top view) Powerdip18 SO20 2/17