SGS Thomson Microelectronics L4943 Datasheet
®
L4943
MULTIFUNCTIO N VOLTA GE REGULATOR FOR CAR RADIO
3 PROGRAM M ABLE OUTPUT S:
♦
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
FILTER CAP
EN1
EN2
12
1
2
GEN REF
ST CAP
Multiwatt 15
ORDERING NUMBER:
L4943
5V Stand-by line to allow the µP to store data.
11
V
V
MEM
(3÷7)V 0.5A
V
ADJ1
(3÷11)V 0.5A
V
ADJ2
(3÷11)V 0.5A
10
13
14
MEM
V
MEM_feed
7
V
ADJ1
V
ADJ1_feed
9
V
ADJ2
V
ADJ2_feed
December 2000
5
V
S
LOAD
DUMP
6
P-GND S-GND TAB
3
HSD
8
4
D97AU668B
HSD
1/6
L4943
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
S
I
O
V
in
RESR Output Capacitor Series Eq. Resistance 0.2 to 10 Ω
P
tot
T
op
T
stg
PIN CONNECTION (t.b.d.)
DC Operating Supply Voltage -0.6 to 30 V
Transient Supply Overvoltage (50ms) 50 V
Voltage Regulator Output Current Internally limited
Input Voltage (EN1, EN2) 0 to 6 V
Power Dissipation (T
= 85°C) 33 W
case
Operating Temperature Range -40 to 85 °C
Storage Temperature Ranges -55 to 150 °C
FILTER CAP
V
feed
2
feed
V
1
ST CAP
V
MEM
V
MEM_feed
V
2
TAB
V
1
P-GND
V
S
HSD
S-GND
EN2
EN1
TAB CONNECTED TO PIN 8
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
D97AU674A
THERMAL DATA
Symbol Parameter Value Unit
R
Th j-ca se
Thermal Resistance Junction to Case 2 °C/W
2/6
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