L4970A 10A SWITCHING REGULATOR 10A OUTPUT CURRENT MULTIPOWER BCD TECHNOLOGY 5.1V TO 40V OUTPUT VOLTAGE RANGE 0 TO 90% DUTY CYCLE RANGE INTERNAL FEED-FORWARD LINE REGULA- TION INTERNAL CURRENT LIMITING PRECISE 5.1V 2% ON CHIP REFERENCE RESET AND POWER FAIL FUNCTIONS SOFT START Multiwatt15V INPUT/OUTPUT SYNC PIN ORDERING NUMBER: L4970A UNDER VOLTAGE LOCK OUT WITH HYS- TERETIC TURN-ON PWM LATCH FOR SINGLE PULSE PER PE- RIOD Realized with BCD mixed technology, the device VERY HIGH EFFICIENCY uses a DMOS output transistor to obtain very high SWITCHING FREQUENCY UP TO 500KHz efficiency and very fast switching times. Features THERMAL SHUTDOWN of the L4970A include reset and power fail for mi- croprocessors, feed forward line regulation, soft CONTINUOUS MODE OPERATION start, limiting current and thermal protection. The device is mounted in a 15-lead multiwatt plastic DESCRIPTION power package and requires few external compo- nents. Efficient operation at switching frequencies The L4970A is a stepdown monolithic power up to 500KHz allows reduction in the size and switching regulator delivering 10A at a voltage cost of external filter components. variable from 5.1 to 40V. BLOCK DIAGRAM June 2000 1/21 This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.L4970A ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit V Input Voltage 55 V 9 V Input Operating Voltage 50 V 9 V Output DC Voltage -1 V 7 Output Peak Voltage at t = 0.1s f = 200KHz -7 V I Maximum Output Current Internally Limited 7 V Bootstrap Voltage 65 V 6 Bootstrap Operating Voltage V + 15 V 9 V , V Input Voltage at Pins 3, 12 12 V 3 12 V Reset Output Voltage 50 V 4 I Reset Output Sink Current 50 mA 4 V , V V V Input Voltage at Pin 5, 10, 11, 13 7 V 5 10, 11, 13 I Reset Delay Sink Current 30 mA 5 I10 Error Amplifier Output Sink Current 1 A I Soft Start Sink Current 30 mA 12 P Total Power Dissipation at T < 120C 30 W tot case T , T Junction and Storage Temperature -40 to 150 C j stg PIN CONNECTION (Top view) THERMAL DATA Symbol Parameter Value Unit R Thermal Resistance Junction-case max 1 C/W th j-case R Thermal Resistance Junction-ambient max 35 C/W th j-amb 2/21