STMicroelectronics L4959 Service Manual
®
L4959
MULTIFUNCTION VOLTAGE REGULATOR FOR HOME AUDIO
4 OUTPUTS:
12V (1.3A); 12V (0.8A); 8.6V (0.6A); 5.6V
(0.25A) STA N DBY
OUT1 12V(a), OU T2 12V(b) AND OUT3 8.6V
WITH INDEPENDENT ENABLE CONTROL
FOR STAND-BY MODE
SHORT- C IR CUIT P R OT E C TIO N TO GROUND
THERMAL SHUTDOWN
DESCRIPTION
The L4959 is a monolithic Multifunction Voltage
Regulator, designed mainly for supplying Home
Audio systems. The L4959 contains one unswitched linear 5.6V regulator for Micro, two
switched regulators 8.6V and 12V, suitable to
feed CD or CD players and LED, Signal Process.
An additional 12V regulator for Solenoid Motor an
CD_TRAY Driven is also available.
ORDERING NUMBER:
Multiwatt 11
L4959
BLOCK DIAGRAM
2/10
V
S
EN 8V
EN 12V(a)
EN 12V(b)
8
7
5
REF
GEN
D97AU569C
5.6V, 250mA
REGULATOR
8.6V, 600mA
REGULATOR
SWITCHED
12V, 800mA
REGULATOR
SWITCHED
12V, 1.3A
REGULATOR
SWITCHED
3
9
11
1
6
OUT 5.6V
OUT 8.6V
OUT 12V(a)
OUT 12V(b)
GND
January 1999
1/6
L4959
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
S
I
O
T
op
T
stg
DC Supply Voltage 35 V
Output Current internally limited
Operating Temperature Range 0 to +70 °C
Storage Temperature –40 to 150 °C
PIN CONNECTION
(Top view)
11
10
9
8
7
6
5
4
3
2
1
TAB CONNECTED TO PIN 6
PIN DESCRIPTION
Pin Pins Description
1 OUT 12V (b) 12V/1.3A SWITCHED OUTPUT VOLTAGE
2V
S
3 OUT 5.6V 5.6V/250mA OUTPUT VOLTAGE
4 N.C. not connected
5 EN 12V (b) Enable 12V/1.3A SWITCHED OUTPUT VOLTAGE
6 GND Ground
7 EN 12V (a) Enable 12V/0.8A SWITCHED OUTPUT VOLTAGE
8 EN 8.6V Enable 8.6V/0.6A SWITCHED OUTPUT VOLTAGE
9 OUT 8.6 8.6V/0.6A SWITCHED OUTPUT VOLTAGE
10 V
S
11 OUT 12V (a) 12V/0.8A SWITCHED OUTPUT VOLTAGE
Supply Voltage
Supply Voltage
D97AU716A
OUT 12V(a)
V
S
OUT 8.6V
EN 8.6V
EN 12V(a)
GND
EN 12V(b)
N.C.
OUT 5.6V
V
S
OUT 12V(b)
QUICK REFERENCE DATA
Symbol Parameter Test Condition Typ. Unit
5V Output Voltage IO = 125mA 5.6 V
14.4V < V
< 21.6V
S
5.6 V
5mA < I < 0.25A
8.6V Output Voltage IO = 300mA 8.6 V
14.4V < V
< 21.6V 5mA < I < 0.6A 8.6 V
S
12V Output Voltage Iout = 400mA 12 V
14.4V < V
< 21.6V
S
12 V
5mA < I < 0.8A
12V Output Voltage Iout = 650mA 12 V
14.4V < VS < 21.6V 5mA < I < 1.3A 12 V
2/6
V
out 5V
V
out 8V
V
out 12Va
V
out 12Vb
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