Page 1
®
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
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Page 2
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
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Page 3
L4943
ELECTRICAL CHARACTERISTICS
(Referred to Test & Application Circuit; V
= 14.4V; T
S
= 25°C;
amb
unless otherwise specified).
Symbol Parameter Test Condition Min. Typ. Max. Unit
5V STAND-BY
V
out Mem
Output Voltage no load; 1+R1/R2 = 2.4
no load; 1+R1/R2 = 4
no load; 1+R1/R2 = 5.6
∆V
∆V
V
dropout
I
qst-by
line
load
I
lim
Line Regulation no load; 11<Vs<18V 5 50 mV
Load Regulation 5mA < IO < 500mA 8 80 mV
Dropout Voltage IO = 200mA, VO = 5V
I
= 500mA, VO = 5V
O
Current Limit Out short to GND 550 800 1000 mA
Quiescent Current IO = 100µA; EN1 = EN2 =0
I
= 500mA; EN1 = EN2 = 5V
O
ADJUSTABLE REG1 SWITCHED
V
outadj
Output Voltage no load; 1+R3/R4 = 2.4
no load; 1+R3/R4 = 4
no load; 1+R3/R4 = 8.8
∆V
line
∆V
load
V
dropout
I
lim
I
q2
SVR Supply Voltage Rejection f = 0.1 to 10kHz, V
Line Regulation no load 0.7 7 mV/V
Load Regulation 5mA < IO < 500mA 8 80 mV
Dropout Voltage IO = 200mA, VO = 5V
I
= 500mA, VO = 5V
O
I
= 200mA, VO = 11V
O
I
= 500mA, VO = 11V
O
Current Limit Out short to GND 550 800 1000 mA
Quiescent Current IO = 500mA 10 25 mA
= 5V 45 55 dB
O
EN1 on EN ADJ1 ON 2 V
EN1 off EN ADJ1 OFF 1V
ADJUSTABLE REG2 SWITCHED
V
outadj
Output Voltage no load; 1+R3/R4 = 2.4
no load; 1+R5/R6 = 4
no load; 1+R3/R4 = 8.8
∆V
∆V
V
dropout
line
load
I
lim
I
q3
Line Regulation no load 0.7 7 mV/V
Load Regulation 5mA < IO < 500mA 12 80 mV
Dropout Voltage IO = 200mA, VO = 5V
I
= 500mA, VO = 5V
O
I
= 200mA, VO = 11V
O
I
= 500mA, VO = 11V
O
Current Limit Out short to GND 550 800 1100 mA
Quiescent Current IO = 500mA 10 25 mA
SVR Supply Voltage Rejection f = 0.1 to 10kHz, VO = 5V 45 55 dB
EN2H on2 EN ADJ2 ON 1.3 V
EN2H off2 EN ADJ2 OFF 0.5 V
400mA HSD SWITCHED
V
dropout
I
I
lim
qhsd
Dropout Voltage IO = 400mA, 9V < VS < 16V 0.2 0.6 V
Current Limit 0.45 0.65 0.8 A
Quiescent Current IO = 400mA 10 25 mA
EN2 on H EN HSD ON 2.5 V
EN2 off H EN HSD OFF 1.7 V
EN2 Gap EN HSD ON minus EN ADJ2
ON
2.85
4.75
6.65
2.85
4.75
10.45
2.85
4.75
10.45
3
5
7
0.36
0.9
0.35
10
3
5
11
0.45
1.1
0.4
1
3
5
11
0.45
1.1
0.4
1
3.15
5.25
7.35
0.5
1.25
0.5
25
3.15
5.25
11.55
0.6
1.5
0.55
1.4
3.15
5.25
11.55
0.6
1.5
0.55
1.4
V
V
V
V
V
mA
mA
V
V
V
V
V
V
V
V
V
V
V
V
V
V
1V
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Page 4
L4943
Figure 1. Application circuit.
EN1
EN2
12
GEN REF
1
2
5
470µF
V
S
ST CAP
10µF
FILTER CAP
15
V
MEM
(3÷7)V 0.5A
V
ADJ1
(3÷11)V 0.5A
V
ADJ2
(3÷11)V 0.5A
HSD
11
10
13
14
V
MEM
R1
V
MEM_feed
7
V
ADJ1
R2
R3
V
ADJ1_feed
V
9
ADJ2
R4
10µF
10µF
10µFR5
V
ADJ2_feed
R6
4
HSD
LOAD
DUMP
P-GND S-GND TAB
836
D97AU672B
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Page 5
L4943
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
A 5 0.197
B 2.65 0.104
C 1.6 0.063
D 1 0.039
E 0.49 0.55 0.019 0.022
F 0.66 0.75 0 .026 0.030
G 1.02 1.27 1.52 0.040 0.050 0.060
G1 17.53 17.78 18.03 0.690 0.700 0 .710
H1 19.6 0.772
H2 20.2 0.795
L 21.9 22.2 22.5 0.862 0.874 0.886
L1 21.7 22.1 22.5 0.854 0.870 0.886
L2 17.65 18.1 0 .695 0.713
L3 17.25 17.5 17.75 0.679 0.689 0.699
L4 10.3 10.7 10.9 0.406 0.421 0.429
L7 2.65 2.9 0.104 0.114
M 4.25 4.55 4.85 0.167 0.179 0.191
M1 4.63 5.08 5.53 0.182 0.200 0.218
S 1.9 2.6 0.075 0.102
S1 1.9 2.6 0.075 0.102
Dia1 3.65 3.85 0.144 0.152
mm inch
OUTLINE AND
MECHANICAL DATA
Multiwatt15 V
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L4943
Information furnished is believ ed t o be accurate and rel i abl e. However, STMic roelectronics assumes no responsibility for the consequences
of use of such informati on nor for any infringement of patents or other ri ghts of third parties which may result from its use. No license is
granted by im plica tion or otherw ise under any patent or pa tent right s of STMicr oelectronic s. Speci fication mentioned in this publication are
subject to c hange without notice. Thi s publication supersedes and replac es all information previ ously supplied. STMic roel ectronics produc ts
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
© 2001 STMicroelectronics – Printed in Italy – All Rights Reserved
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