L4970A 10A SWITCHING REGULATOR 10A OUTPUT CURRENT.1 TO 40 OUTPUT OLTAGE RANGE 0 TO 90 DUTY CYCLE RANGE INTERNAL FEED-FORWARD LINE REGULA- TION INTERNAL CURRENT LIMITING PRECISE.1 ± 2 ON CHIP REFERENCE RESET AND POWER FAIL FUNCTIONS SOFT START INPUT/OUTPUT SYNC PIN UNDER OLTAGE LOCK OUT WITH HYS- TERETIC TURN-ON PWM LATCH FOR SINGLE PULSE PER PE- RIOD ERY HIGH EFFICIENCY SWITCHING FREQUENCY UP TO 00KHz THERMAL SHUTDOWN CONTINUOUS MODE OPERATION DESCRIPTION The L4970A is a stepdown monolithic power switching regulator delivering 10A at a voltage variable from.1 to 40. BLOCK DIAGRAM MULTIPOWER BCD TECHNOLOGY Multiwatt1 ORDERING NUMBER: L4970A Realized with BCD mixed technology, the device uses a DMOS output transistor to obtain very high efficiency and very fast switching times. Features of the L4970A include reset and power fail for microprocessors, feed forward line regulation, soft start, limiting current and thermal protection. The device is mounted in a 1-lead multiwatt plastic power package and requires few external components. Efficient operation at switching frequencies up to 00KHz allows reduction in the size and cost of external filter components. This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice. 1/21
ABSOLUTE MAXIMUM RATINGS Symbol Parameter alue Unit 9 Input oltage 9 Input Operating oltage 0 7 Output DC oltage Output Peak oltage at t = 0.1µs f = 200KHz I 7 Maximum Output Current Internally Limited 6 Bootstrap oltage Bootstrap Operating oltage -1-7 6 9 + 1 3, 12 Input oltage at Pins 3, 12 12 4 Reset Output oltage 0 I 4 Reset Output Sink Current 0 ma, 10, 11, 13 Input oltage at Pin, 10, 11, 13 7 I Reset Delay Sink Current 30 ma I 10 Error Amplifier Output Sink Current 1 A I 12 Soft Start Sink Current 30 ma P tot Total Power Dissipation at T case < 120 C 30 W T j, T stg Junction and Storage Temperature -40 to 10 C PIN CONNECTION (Top view) THERMAL DATA Symbol Parameter alue Unit R th j-case Thermal Resistance Junction-case max 1 C/W R th j-amb Thermal Resistance Junction-ambient max 3 C/W 2/21
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, Tj = 2 C, i = 3, R4 = 16KΩ, C9 = 2.2nF, fsw = 200KHz typ, unless otherwise specified) DYNAMIC CHARACTERISTICS i input oltage Range (pin 9) o = ref to 40 1 0 I o = 10A o Output otage i = 1 to 0.1.2 I o = A; o = re f o Line Regulation i = 1 to 0 I o = A; o = re f 12 30 m o Load Regulation o = ref I o = 3A to 6A I o = 2A to 10A d Dropout oltage Between Pin 9 and 7 I o = A I o = 10A I 7L Max. Limiting Current i = 1 to 0 11 13 1 A η Efficiency I o = A o = ref o = 12 SR Supply oltage Ripple Reject. I o = 10A o = ref o = 12 10 20 0. 1.1 80 8 92 7 80 87 30 0 0.8 1.6 m m i = 2RMS; I o = A 6 60 db f = 100Hz; o = ref f Switching Frequency 180 200 220 KHz f oltage Stability of i = 1 to 4 2 6 i Swiching Frequency f T j Temperature Stability of Swiching Frequency T j = 0 to 12 C 1 f max Maximum Operating Switching Frequency ref SECTION (pin 14) o = ref ; R 4 = 10KΩ I o = 10A; C 9 = 1nF 00 KHz 14 Reference oltage.1.2 7 14 Line Regulation i = 1 to 0 10 2 m 7 14 Load Regulation I14 = 0 to 1mA 20 40 m 7 14 T Average Temperature Coefficient Reference oltage T j = 0 C to 12 C 0.4 m/ C 7 I 14 short Short Circuit Current Limit 14 = 0 70 ma 7 START SECTION (pin 1) 1 Reference oltage 11.4 12 12.6 7 1 Line Regulation i = 1 to 0 0.6 1.4 7 1 Load Regulation I1 = 0 to 1mA 0 200 m 7 I 1 short Short Circuit Current Limit 1 = 0 80 ma 7 6/21
ELECTRICAL CHARACTERISTICS (continued) DC CHARACTERISTICS 9on Turn-on Threshold 10 11 12 7A 9 Hyst Turn-off Hysteresys 1 7A I 9Q Quiescent Current 12 = 0; S1 = D 13 19 ma 7A I 9OQ Operating Supply Current 12 = 0; S1 = C; S2 = B 16 23 ma 7A I 7L Out Leak Current i = ; S3 = A; 12 = 0 2 ma 7A SOFT START I 12 Soft Start Source Current 12 = 3; 11 = 0 70 100 130 µa 7B 12 Output Saturation oltage I12 = 20mA; 9 = 10 I 12 = 200µA; 9 = 10 ERROR AMPLIFIER 10H High Level Out oltage I 10 = -100µA; S1 = C 6 7C 11 = 4.7 10L Low Level Out oltage I10 = +100µA; S1 = C 1.2 7C 11 =.3; I 10H Source Output Current 10 = 1; S1 = E 100 10 µa 7C 11 = 4.7 I 10L Sink Output Current 10 = 6; S1 = D 100 10 µa 7C 11 =.3 I 11 Input Bias Current RS = 10KΩ 0.4 3 µa G DC Open Loop Gain CM = 4; 60 db R S = 10Ω SR Supply oltage Rejection 1 < i < 0; 60 80 db R S = 10Ω OS Input Offset oltage R S = 0Ω 2 10 m RAMP GENERATOR (pin 2) 2 Ramp alley S1 = C; S2 = B 1.2 1. 7A 2 Ramp Peak S1 = C; i = 1 S2 = B; i = 4 I 2 Min. Ramp Current S1 = A; I 1 = 100µA 270 300 µa 7A I 2 Max. Ramp Current S1 = A; I1 = 1mA 2.4 2.7 ma 7A SYNC FUNCTION (pin 13) 13 Low Input oltage i = 1 to 0; 12 = 0; 0.3 0.9 7A S1 = C; S2 = B; S4 = B 13 High Input voltage 12 = 0; S1 = C; S2 = B; S4 = B 3.. 7A I 13L I 13H Sync Input Current with Low Input oltage Input Current with High Input oltage 13 = 2 = 0.9; S4 = A; S1 = C; S2 = B 13 = 3.; S4 = A; S1 = C; S2 = B 2.. 1 0.7 7B 7B 7A 7A 0.4 ma 7A 2 ma 7A 13 Output Amplitude 4 t W Output Pulse Width thr = 2. 0.3 0. 0.8 µs 7/21
ELECTRICAL CHARACTERISTICS (continued) RESET AND POWER FAIL FUNCTIONS 11R 11F H L Rising Threshold oltage (pin 11) Falling Threshold oltage (pin 11) Delay High Threshold oltage Delay Low Threshold oltage i = 1 to 0 3 =.3 i = 1 to 0 3 =.3 i = 1 to 0 14 = 11 3 =.3 i = 1 to 0 14 = 11 3 =.3 ref 120 ref 100 4.77 ref 200 ref 80 ref 160 m m 7D 7D 4.9.1.2 7D 1 1.1 1.2 7D I SO Delay Source Current 3 =.3; = 3 40 60 80 µa 7D I SI Delay Sink Current 3 = 4.7; = 3 10 ma 7D 4S Out Saturation oltage I 4 = 1mA; S1 = B 0.4 7D 3 = 4.7 I 4 Output Leak Current 4 = 0; S1 = A 100 µa 7D 3 =.3 3R Rising Threshold oltage 11 = 14 4.9.1.2 7D 3H Hysteresys 0.4 0. 0.6 7D I 3 Input Bias Current 1 3 µa 7D Figure : Test and Evaluation Board Circuit TYPICAL PERFORMANCES (using evaluation board) : n = 83 (i = 3 ; o = REF ; Io = 10A ; fsw = 200KHz) o RIPPLE = 30m (at 10A) with output filter capacitor ESR 60mΩ Line regulation = m (i = 1 to 0) Load regulation = 1m (Io = 2 to 10A) For component values, refer to test circuit part list. 8/21
DIM. mm inch MIN. TYP. MAX. MIN. TYP. MAX. A 0.197 B 2.6 0.104 C 1.6 0.063 D 1 0.039 E 0.49 0. 0.019 0.022 F 0.66 0.7 0.026 0.030 G 1.02 1.27 1.2 0.040 0.00 0.060 G1 17.3 17.78 18.03 0.690 0.700 0.710 H1 19.6 0.772 H2 20.2 0.79 L 21.9 22.2 22. 0.862 0.874 0.886 L1 21.7 22.1 22. 0.84 0.870 0.886 L2 17.6 18.1 0.69 0.713 L3 17.2 17. 17.7 0.679 0.689 0.699 L4 10.3 10.7 10.9 0.406 0.421 0.429 L7 2.6 2.9 0.104 0.114 M 4.2 4. 4.8 0.167 0.179 0.191 M1 4.63.08.3 0.182 0.200 0.218 S 1.9 2.6 0.07 0.102 S1 1.9 2.6 0.07 0.102 Dia1 3.6 3.8 0.144 0.12 OUTLINE AND MECHANICAL DATA Multiwatt1 20/21