L4973 STMicroelectronics, L4973 Datasheet
L4973
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L4973 Summary of contents
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... POWERDIP (12+3+3) ORDERING NUMBERS: L4973V3.3 (Powerdip) L4973D3.3 L4973V5.1 (Powerdip) L4973D5.1 DESCRIPTION The L4973 is a step down monolithic power switching regulator delivering 3.5A at fixed volt- ages of 3.3V or 5.1V and using a simple external divider output adjustable voltage up to 50V. Realized in BCD mixed technology, the device 10 12 ...
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... L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1 uses an internal power D-MOS transistor (with a typical Rdson of 0.15ohm) to obtain very high effi- ciency and very fast switching times. Switching frequency up to 300KHz are achievable (the maximum power dissipation of the packages must be observed). A wide input voltage range between 8V to 55V and output voltages regulated from 3 ...
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... Unregulated DC input voltage Stepdown regulator output. Stepdown feedback input. Connecting the output directly to this pin results in an output voltage of 3.3V for the L4973V3.3 and 5.1V. An external resistive divider is required for higher output voltages. For output voltage less than 3.3V, see note ** and Figure 32. ...
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... L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1 ELECTRICAL CHARACTERISTICS ( Refer to the test circuit 20K ; unless otherwise specified) = specifications referred to T OSC Symbol Parameter DYNAMIC CHARACTERISTICS Input Voltage Range (*) Output Voltage L4973V5.1 Output Voltage L4973V3.3 R DSON Maximum Limiting Current Efficiency Switching Frequency Supply Voltage Ripple ...
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... C1=1000 F/63V C2=220nF/63V C3=470nF C4=1 F/50V C5=220pF C6=22nF C7=2.7nF C8=220nF/63V C0=100 F/40V(C9,C10,C11) C12=Optional (220nF) 77310 - 40 Turns - 0.9mm L1=150 H K OOL R1=9.1K R2=20K D1=GI SB560 L4973V3 - L4973V5 - L4973D3 - L4973D5 200 V = VFB 60 COMP C =4.7 F 1-5mA load REF current -0.1 to 0.1mA; comp comp ...
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... L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1 Typical Performance (Using Evaluation Board) fsw = 100kHz Output Output Voltage Ripple 3.3V 20mV 5.1V 20mV 12V 30mV Figure 1a: Evaluation Board (Components Side) Figure 1b: Evaluation Board (Solder Side) 6/16 Line Regulator Efficiency 50V o CC 81.5 (%) 3mV 86.7 (%) 3mV 93.5 (%) 3mV (V =15 to 50V) ...
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... Figure 2: Quiescent Drain Current vs. Input Voltage (0% Duty Cycle) Ibias (mA) 200KHz-R2=22K C7=1.2nF 5.0 Tamb= 4.5 4.0 100KHz-R2=20K 3.5 0Hz 3.0 2.5 2 L4973V3 - L4973V5 - L4973D3 - L4973D5 INH SYNC 7 L4973V5.1 17 4,5,6 16 2,3 11 13,14, D97IN665A INH SYNC 7 L4973V3.3 ...
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... L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1 Figure 4: Stand by Drain Current vs. input Voltage Ibias ( inh 150 25 C 100 125 Figure 6: Reference Voltage vs. Input Voltage (Pin 16) V REF (V) Tj=25 C Pin 16 5.15 5.1 5.05 5 Figure 8: Inhibit Current vs. Inhibit Voltage (Pin 10) Iinh ( A) Vcc=35V ...
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... Tj=125 C 3.33 Tj=25 C 3.32 3.31 3 Figure 14: Switching Frequency vs. Input Voltage fsw (KHz) Tamb=25 C 105 100 L4973V3 - L4973V5 - L4973D3 - L4973D5 Figure 11: Line Regulation (see fig. 1d) V D97IN640 O (V) 3.35 3.34 Tj=125 C 3.33 3.32 3.31 3 Figure 13: Switching Frequency vs.R2 and C7 (fig. 1) fsw D97IN661 (KHz) ...
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... L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1 Figure 16: Dropout Voltage Between pin 7,8 and 2,3 V (V) Tj=125 C 0.6 0.4 Tj Figure 18: Efficiency vs. Output Voltage (Diode STPS745D) (%) 98 100KHz 96 94 200KHz 35V Figure 20: Efficiency vs. Output Current (see fig.1c) (%) Vcc=12V 90 Vcc=24V 85 Vcc=48V ...
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... Figure 26: Load Transient 200 s/DIV 35V 100KHz sw L4973V3 - L4973V5 - L4973D3 - L4973D5 Figure 23: Power dissipation vs. Input Voltage (Device only) (see fig.1c) Pdiss D97IN662 (W) 1.5 1.0 0.5 0 3 Figure 25: Pulse by Pulse Limiting Current vs. Junction Temperature Ilim D97IN648 (A) 5 ...
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... L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1 Figure 28: Source Current Rise and Fall Time, pin 2, 3 (See fig1) Figure 30:Soft Start Capacitor Selection vs. In- ductor and V max (ref. AN938) CC Lomax ( 200KHz sw 150 100 Figure 32: 3. < 3.3V (see part list fig. 1) ...
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... L4973 4,5,6 13,14,15 13,14,15 Figure 35: Multioutput not Isolated (Pin out referred to DIP12+3+ < 20 L4973V3 - L4973V5 - L4973D3 - L4973D5 = 200kHz) sw INH SYNC 220nF L4973V3.3 L1 2,3 4,5,6 11 13,14,15 12 Vo=3.33V Io=3. 9k1 470uF-25V HFQ C6 Panasonic 22nF D97IN668A ...
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... L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1 mm DIM. MIN. TYP. MAX. MIN. a1 0.51 0.020 B 0.85 1.40 0.033 b 0.50 b1 0.38 0.50 0.015 D 24.80 E 8.80 e 2.54 e3 20.32 F 7.10 I 5.10 L 3.30 Z 2.54 14/16 inch OUTLINE AND MECHANICAL DATA TYP. MAX. 0.055 0.020 0.020 0.976 0.346 0.100 0.800 0.280 0.201 0.130 Powerdip 18 0.100 ...
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... D 12.6 13 0.496 E 7.4 7.6 0.291 e 1.27 0.050 H 10 10.65 0.394 h 0.25 0.75 0.010 L 0.4 1.27 0.016 K 0 (min.)8 (max L4973V3 - L4973V5 - L4973D3 - L4973D5 OUTLINE AND MECHANICAL DATA MAX. 0.104 0.012 0.020 0.013 0.512 0.299 0.419 0.030 0.050 SO20 SO20MEC 15/16 ...
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... L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice ...