®
L4946
QUAD VOLTAGE REGULATOR WITH INHIBIT AND RESET
4 OUTPUTS: 10V (125mA); 8V (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 L4946 is a quad output low drop voltage
regulator. The four outputs are a low drop 10V at
125mA (V
O1
), a 8V at 250mA (V
O2
), a 5V at
200mA (V
O3
) and a low drop 5V st-by line at
100mA (V
O4
).
The IC includes a monitoring circuit to warn if a
low voltage or no voltage condition is occurring.
V
O1,2,3
are off during st-by mode.
BLOCK DIAGRAM
MULTIPOWER BCD TECHNOLOGY
Multiwatt 11
ORDERING NUMBER:
L4946
The STCAP pin allows the battery voltage to de-
cay slowly giving the
µ
P time to store data. This
IC is designed for supplying microcomputer con-
trolled systems specially in automotive applica-
tions.
L4946
125mA
250mA
200mA
June 2000
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STMICROELECTRONICS [ STMICROELECTRONICS ]
