 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| (R) L4943 MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO 3 PROGRAMMABLE OUTPUTS: 3 TO 11V (500mA); 3 TO 11V (500mA); 3 TO 7V (500mA) STANDBY OUT1 AND OUT2 WITH INDEPENDENT ENABLE CONTROL FOR STAND-BY MODE 0.4A HIGH SIDE DRIVER LOAD DUMP PROTECTION THERMAL SHUTDOWN DESCRIPTION The L4943 contains a triple voltage regulator and a high side driver. In stand-by the output is active as long as possible even when in thermal shutdown or under any other fault conditions. The STCAP pin allows the use of a reserve supply capacitor that will hold enough energy for the BLOCK DIAGRAM Multiwatt 15 ORDERING NUMBER: L4943 5V Stand-by line to allow the P to store data. FILTER CAP 11 GEN REF VMEM (3/7)V 0.5A 10 ST CAP 12 VMEM VMEM_feed VADJ1 VADJ1_feed VADJ2 VADJ2_feed EN1 1 VADJ1 (3/11)V 0.5A 7 13 EN2 2 VADJ2 (3/11)V 0.5A 9 14 VS 5 HSD LOAD DUMP 4 HSD 6 P-GND 3 S-GND 8 TAB D97AU668B December 2000 1/6 L4943 ABSOLUTE MAXIMUM RATINGS Symbol VS IO Vin RESR Ptot Top Tstg Parameter DC Operating Supply Voltage Transient Supply Overvoltage (50ms) Voltage Regulator Output Current Input Voltage (EN1, EN2) Output Capacitor Series Eq. Resistance Power Dissipation (Tcase = 85C) Operating Temperature Range Storage Temperature Ranges Value -0.6 to 30 50 Internally limited 0 to 6 0.2 to 10 33 -40 to 85 -55 to 150 Unit V V V W C C PIN CONNECTION (t.b.d.) 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 FILTER CAP V2 feed V1 feed ST CAP VMEM VMEM_feed V2 TAB V1 P-GND VS HSD S-GND EN2 EN1 TAB CONNECTED TO PIN 8 D97AU674A THERMAL DATA Symbol RTh j-case Parameter Thermal Resistance Junction to Case Value 2 Unit C/W 2/6 L4943 ELECTRICAL CHARACTERISTICS (Referred to Test & Application Circuit; VS = 14.4V; Tamb = 25C; unless otherwise specified). Symbol 5V STAND-BY Vout Mem Vline Vload Vdropout Ilim Iqst-by Output Voltage no load; 1+R1/R2 = 2.4 no load; 1+R1/R2 = 4 no load; 1+R1/R2 = 5.6 no load; 11 ADJUSTABLE REG1 SWITCHED Voutadj Vline Vload Vdropout Output Voltage Line Regulation Load Regulation Dropout Voltage Ilim Iq2 SVR EN1 on Current Limit Quiescent Current Supply Voltage Rejection EN ADJ1 ON Out short to GND IO = 500mA f = 0.1 to 10kHz, VO = 5V EN1 off EN ADJ1 OFF ADJUSTABLE REG2 SWITCHED Voutadj Vline Vload Vdropout Output Voltage Line Regulation Load Regulation Dropout Voltage Ilim Iq3 SVR EN2H on2 Current Limit Quiescent Current Supply Voltage Rejection EN ADJ2 ON 550 45 1.3 EN2H off2 EN ADJ2 OFF 400mA HSD SWITCHED Vdropout Ilim Iqhsd EN2 on H EN2 off H EN2 Gap Dropout Voltage Current Limit Quiescent Current EN HSD ON EN HSD OFF EN HSD ON minus EN ADJ2 ON IO = 400mA, 9V < VS < 16V 0.45 IO = 400mA 2.5 0.2 0.65 10 0.5 0.6 0.8 25 1.7 1 3/6 L4943 Figure 1. Application circuit. 10F FILTER CAP 15 ST CAP 470F 12 GEN REF VMEM (3/7)V 0.5A 10 1 VADJ1 (3/11)V 0.5A 13 9 VADJ2 (3/11)V 0.5A 14 VS 5 HSD LOAD DUMP P-GND 4 HSD VADJ2_feed R6 VADJ1_feed VADJ2 R4 R5 10F 7 VMEM_feed VADJ1 R2 R3 10F 11 VMEM R1 10F EN1 EN2 2 6 S-GND 3 TAB 8 D97AU672B 4/6 L4943 DIM. MIN. A B C D E F G G1 H1 H2 L L1 L2 L3 L4 L7 M M1 S S1 Dia1 21.9 21.7 17.65 17.25 10.3 2.65 4.25 4.63 1.9 1.9 3.65 0.49 0.66 1.02 17.53 19.6 mm TYP. MAX. 5 2.65 1.6 1 0.55 0.75 1.27 17.78 1.52 18.03 20.2 22.2 22.1 17.5 10.7 4.55 5.08 22.5 22.5 18.1 17.75 10.9 2.9 4.85 5.53 2.6 2.6 3.85 0.862 0.854 0.695 0.679 0.406 0.104 0.167 0.182 0.075 0.075 0.144 0.019 0.026 0.040 0.690 0.772 MIN. inch TYP. MAX. 0.197 0.104 0.063 0.039 0.022 0.030 0.050 0.700 0.060 0.710 0.795 0.874 0.870 0.689 0.421 0.179 0.200 0.886 0.886 0.713 0.699 0.429 0.114 0.191 0.218 0.102 0.102 0.152 OUTLINE AND MECHANICAL DATA Multiwatt15 V 5/6 L4943 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. 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. The ST logo is a registered trademark of STMicroelectronics (c) 2001 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com 6/6 |
Price & Availability of L4943
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |