SGS Thomson Microelectronics L4948 Datasheet
L4948
QUAD VOLTAGE REGULATOR WITH INHIBIT AND RESET
4 OUTPUTS: 10V (300mA); 8V (400mA); 5V
(600mA);5V (100mA)
ALL FOUR OUTPUTS ARE LOW DROP
5V (100mA) ST-BY OUTPUT VOLTAGE
EARLY WARNING OUTPUT FOR SUPPLY
UNDERVOLTAGE(LVW)
THERMAL SHUTDOWN AND CURRENT
LIMITATION(FOLDBACK)
REVERSE BATTERY AND LOAD DUMP
PROTECTION
INHIBIT (ON/OFF)AND RESET FUNCTIONS
DESCRIPTION
The L4948 is a quad output low drop voltage
regulator. All four outputs are low drop: 10V at
300mA (V
) and a 5V st-by line at 100mA (VO4).
(V
O3
The IC includes a monitoring circuit to warn if a
low voltage or no voltage condition is occurring.
V
O1,2,3
The STCAP pin allows the battery voltage to de-
BLOCK DIAGRAM
), 8V at 400mA (VO2), 5V at 600mA
O1
are offduring st-by mode.
MULTIPOWER BCD TECHNOLOGY
Multiwatt 11
ORDERING NUMBER: L4948
cay slowly giving theµP time to store data. This
IC is designed for supplying microcomputer controlled systems specially in automotive applications.
June 2000
1/9
L4948
OPERATINGCONDITION
Symbol Parameter Value Unit
V
S
I
L
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
S
V
I
V
O
T
stg
T
j
PIN CONNECTION
Supply Voltage -15 to 27 V
Load Current I
O1
I
O2
I
O3
I
O4
300
400
600
100
Supply Voltage -35 to 60 V
Input Voltage (ON/OFF) 0 to 12 V
Output Voltage (LVW, Reset) 0 to 12 V
Storage Temperature Range -65 to 150
Junction Temperature Range max 150
Load Dump (5ms rise, 115ms decay) 60 V
mA
mA
mA
mA
C
°
C
°
APPLICATIONCIRCUIT
THERMAL DATA
Symbol Parameter Value Unit
Thermal Resistance Junction-case max 2 °C/W
2/9
R
th j-case
L4948
ELECTRICAL CHARACTERISTICS (VS= 10.5 to 16V; IO1= 6mA, IO2= 8mA, IO3= 4mA; IO4= 0.4mA;
C
=10µF max; T
O
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
∆
V
S-VO1
V
V
V
O1
V
O1
I
Q
Ι
L
O1
O1
O1
Output Voltage IO1= 300mA; T
Load Regulation IO1= 6 to 300mA 150 mV
Quiescent Current (∆IS)V
Dropout Voltage IO1 = 300mA
Current Limit (Foldback) note1 VO1= 0V 360 800 mA
Max Bat.Trans. RO = 100Ω
Rev. Voltage Trans. VS= -35V; t≤1ms; RO= 100
Rev. Voltage . VS= -15V; RO = 100Ω -0.4 1 V
Ripple rejection f
∆V
O1
Line Regulation
∆V
Output Noise Check Output for AC noise
V
∆V
V
S-VO2
V
O2
O2
∆I
Q
Ι
L
O2
Output Voltage IO2= 400mA; T
Load Regulation IO2 = 8 to 400mA 150 mV
Quiescent Current (∆IS)VS= 14V; IO2= 8mA;
Dropout Voltage IO2= 400mA
Current Limit (Foldback) note1 VO2= 0V 480 960 mA
Max Bat.Trans. RO= 100Ω
= -40to 85°C, unlessotherwisespecified.)
amb
11V < V
S
V
S
RampV
Hold V
RampV
T
amb
< 16V all temps
S
= 14V; IO1= 6mA;
=14V ; IO1= 300mA;
from14 to60V in3-5ms 11 V
S
at 60V for 10ms
S
from60 to14V in3-5ms;
S
=25°C;
all temps
amb
=25°C;
T
=25°C;
amb
all temps
9.7
9.5
9.7
9.5
10
10
10
10
10.3
10.5
10
30
400
600
2
10.3
10.5
Ω
CheckV
I
O1,Tamb
=1KHz;1VppAC;VS=14V
O
= 180mA; IO2= 200mA
O1
=25°C;
all temps
;
9.7
9.5
50
10
10
10.3
10.5
IO3= 400mA; IO4= 40mA;
f
O=10KHz;1VppAC;V
I
= 180mA; IO2= 200mA
O1
=14V
S
;
50 dB
IO3= 400mA; IO4= 40mA;
across VSrange VS= 11V to 26V 50 mV
O1
400
using a 100KHz LP filter
Check Output for AC noise
200
using an A weighted filter (2020KHz)
=25°C;
amb
all temps
7.75
7.60
8
8.25
8
8.40
10
V
= 14V; IO2= 400mA;
S
set V
set V
RampV
Hold V
RampV
T
amb
+1V; T
S=VO2
+1.5V;all temps
S=VO2
from14 to60V in3-5ms 9 V
S
at 60V for 10ms
S
from60 to14V in3-5ms;
S
=25°C;
all temps
amb
=25°C;
7.75
7.60
8
8
35
400
600
2
8.25
8.40
V
V
mA
mA
mV
mV
V
V
V
V
V
dB
µ
µV
V
V
mA
mA
mV
mV
V
V
V
V
3/9
Loading...