L4978D STMicroelectronics, L4978D Datasheet
L4978D
Specifications of L4978D
Available stocks
Related parts for L4978D
L4978D Summary of contents
Page 1
... The device is available in plastic dual in line, DIP- 8 for standard assembly, and SO16W for SMD as- sembly 20K L4978 2.7nF 22nF DIP-8 Part Number L4978 L4978D L4978D013TR SO16 in Tape & Reel regulation, soft-start 126µH (77120 100nF 330µF PS3L60U D98IN837A L4978 SO16W Package DIP-8 SO16 protection =3 ...
Page 2
L4978 Table 2. Block Diagram THERMAL SHUTDOWN 2 SS_INH INHIBIT SOFTSTART 7 COMP 8 E/A FB 3.3V OSCILLATOR 3 OSC Figure 3. Pins Connection (Top view) GND 1 SS_INH 2 OSC 3 OUT 4 D97IN595 DIP-8 Table 3. Pin Description ...
Page 3
Table 3. Pin Description (continued) N° Pin Name OUT BOOT 7 13 COMP (*) Pins 10, 15 and 16 are not internally, electrically connected ...
Page 4
L4978 Table 6. Electrical Characteristcs (T = 25° 2.7nF osc osc to T from 0 to 125°C j Symbol Parameter DYNAMIC CHARACTERISTIC V Operating input voltage range I V Output voltage o V Dropout voltage d ...
Page 5
Table 6. Electrical Characteristcs (T = 25° 2.7nF osc osc to T from 0 to 125°C j Symbol Parameter OSCILLATOR SECTION Ramp Valley Ramp peak Maximum duty cycle Maximum Frequency Figure 4. Test and evaluation board ...
Page 6
L4978 Figure 6. Quiescent drain current vs. input voltage. Iq (mA) 200KHz R =22K 1 C =1.2nF Tamb=25˚ Figure 7. Quiescent ...
Page 7
Figure 12. Switching Frequency vs. input voltage.. fsw (KHz) 107.5 105.0 102.5 100.0 97.5 95.0 92.5 90 Figure 13. Switching frequency vs. junction temperature. fsw (KHz) 105 100 ...
Page 8
L4978 Figure 18. Efficiency vs. output current. . η (%) 90 V =12V CC V =24V =48V 0.2 0.4 0.6 0.8 1.0 1.2 1.4 I Figure 19. Efficiency vs. output ...
Page 9
Figure 24. Load transient. . Figure 25. Line transient ( 1ms/DIV Figure 26. Soft start capacitor selection Vs inductor and V . ccmax L 680nF (µH) fsw=100KHz 400 ...
Page 10
L4978 3 Package Informations Figure 29. DIP-8 Mechanical Data & Package Dimensions mm DIM. MIN. TYP. MAX. A 3.32 a1 0.51 B 1.15 1.65 b 0.356 0.55 b1 0.204 0.304 D 10.92 E 7.95 9.75 e 2.54 e3 7.62 e4 ...
Page 11
Figure 30. SO16 Wide Mechanical Data & Package Dimensions mm DIM. MIN. TYP. MAX. A 2.35 2.65 A1 0.10 0.30 B 0.33 0.51 C 0.23 0.32 (1) 10.10 10. 7.40 7.60 e 1.27 H 10.0 10.65 h 0.25 ...
Page 12
L4978 Table 7. Revision History Date Revision October 2001 May 2005 12/13 8 First Issue 9 Modified D1 on the Fig. 4. Description of Changes ...
Page 13
... No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics ...