SGS Thomson Microelectronics L4946B Datasheet
L4946B
QUAD VOLTAGE REGULATOR WITH INHIBIT AND RESET
4 OUTPUTS:10V (125mA);8.5V (250mA); 5V
(200mA);5V (100mA)
10V AND 5V (100mA) OUTPUT 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 L4946B is a quad output low drop voltage
regulator. The four outputs are a low drop 10V at
125mA (V
200mA (V
100mA (V
), a 8.5V at 250mA (VO2), a 5V at
O1
) and a low drop 5V st-by line at
O3
).
O4
The IC includes a monitoring circuit to warn if a
low voltage or no voltage condition is occurring.
V
are offduring st-by mode.
O1,2,3
BLOCK DIAGRAM
MULTIPOWER BCD TECHNOLOGY
Multiwatt 11
ORDERING NUMBER: L4946B
The STCAP pin allows the battery voltage to decay slowly giving theµP time to store data. This
IC is designed for supplying microcomputer controlled systems specially in automotive applications.
June 2000
8.5V
L4946B
125mA
250mA
200mA
1/9
L4946
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 -13.5 to26.5 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 5 V
Output Voltage (LVW, Reset) 0 to 5 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
uF
0.1
L4946
THERMAL DATA
Symbol Parameter Value Unit
Thermal Resistance Junction-case max 2 °C/W
2/9
R
th j-case
L4946
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
V
S-VO1
V
V
V
O1
O1
I
Q
Ι
L
O1
O1
O1
Output Voltage IO1= 125mA; T
Load Regulation IO1 = 5 to 125mA 150 mV
Quiescent Current(∆IS)VS= 14V; IO1= 5mA;
Dropout Voltage IO1= 125mA
Current Limit (Foldback) note1 VO1 = 0V 150 300 mA
Max Bat.Trans. RO= 100
Rev. Voltage Trans. VS= -35V; t ≤ 1ms; RO= 100Ω
Rev. Voltage . VS= -15V; RO= 100
Ripple rejection
(by design only)
∆V
V
∆V
V
S-VO2
V
V
V
O1
O2
O2
∆I
Q
Ι
L
O2
O2
O2
Line Regulation
V
∆
Output Voltage IO2= 250mA; T
Load Regulation IO2 = 5 to 250mA 150 mV
Quiescent Current(∆IS)VS= 14V; IO2= 5mA;
Dropout Voltage IO2= 250mA
Current Limit (note1) VO2= 0V 300 600 mA
Max Bat.Trans. RO= 100
Rev. Voltage Trans. VS= -35V; t < 1ms; RO= 100Ω
Rev. Voltage . VS= -15V; t = 30s; RO = 100Ω -0.4 1 V
= -40to 85°C, unlessotherwise specified.)
amb
11V < V
< 16V all temps
S
amb
=25°C;
9.7
9.5
10
10
10.3
10.5
10
V
=14V ; IO1= 125mA;
S
T
=25°C
amb
all temps
18
400
600
Ω
RampV
Hold V
RampV
CheckV
f
O
I
O1 = 90mA; IO2 = 125mA;
from14 to60Vin3-5ms 11 V
S
at 60V for 10ms
S
from60to14Vin3-5ms;
S
,T
O1
=120-10KHz;1VppAC;VS=14V
T
amb
all temps
amb
all temps
Ω
=25°C;
=25°C;
9.7
9.5
9.7
9.5
10
10
10
10
-0.4 1 V
50
2
10.3
10.5
10.3
10.5
IO3= 75mA; IO4= 50mA;
f
= 20-20KHz; 1VppAC; VS=14V
O
I
= 90mA; IO2= 125mA
O1
;
50 dB
IO3 = 75mA; IO4 = 50mA;
across VSrange VS= 11V to 26V 50 mV
O1
=25°C;
amb
all temps
7.75
7.60
8
8.25
8
8.40
10
V
= 14V; IO2= 250mA;
S
T
=25°C
amb
all temps
35
400
600
Ω
RampV
Hold V
Ramp V
T
amb
all temps
CheckV
from14 to60Vin3-5ms 9 V
S
at 60V for 10ms
S
from60to14Vin3-5ms;
S
=25°C;
, standard
O2
T
amb
all temps
=25°C
7.85
7.60
7.85
7.80
8
8.15
8
8.20
8
8.15
8
8.20
2
V
V
mA
mA
mV
mV
V
V
V
V
V
dB
V
V
mA
mA
mV
mV
V
V
V
V
V
3/9
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