L4909 ,EXTERNALLY ADJUSTABLE MULTIFUNCTION REGULATORL4909EXTERNALLY ADJUSTABLE MULTIFUNCTION REGULATOR■ 3 OUTPUTS- Vo1 : output voltage variable from 5 ..
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L4909
EXTERNALLY ADJUSTABLE MULTIFUNCTION REGULATOR
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L4909May 2000 3 OUTPUTS
- Vo1 : output voltage variable from 5 to 12 V;
limit current : 1.2 A.
- Vo2 : output voltage variable from 5 to 12 V;
limit current : 1.2 A.
- Vo3 : output voltage variable from 5 to 12 V;
limit current : 1.2 A. ENABLE INPUT FOR EACH REGULATOR FEEDBACK INPUT FOR EACH REGULATOR SHORT CIRCUIT PROTECTION TO GROUND OVERCURRENT WARNING DRIVER FOR EXTERNAL SCR (CROWBAR
PROTECTION) THERMAL SHUTDOWN
DESCRIPTIONIt is a monolithic Multifunction Voltage Regulator; it
contains 3 regulators, (REG1, REG2, REG3) each
one with an enable input and a feedback input, to al-
low the voltage setting via external resistive divider.
Each regulator is current limited and furthermore an
OR-ed warning signal is output (open collector, ac-
tive low output) when the current in a regulator goes
above an over-current threshold (1 A typ for any reg-
ulator).
When one output voltage is higher than 20% typ of its
nominal value (for instance in case of input-to-output
short circuit), the crowbar output pin is activated, trig-
gering an external SCR (connected between input
and ground) that blows the input line fuse.
EXTERNALLY ADJUSTABLE MULTIFUNCTION REGULATOR
BLOCK DIAGRAM
L4909 2/7
PIN CONNECTION
Table 1. Pin Description
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L4909
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
ELECTRICAL CHARACTERISTICS (Cout = 100nF; Vin -Vo = 5V; Io = 10mA; Tcase = 25°C unless otherwisespecified
L4909 4/7
ELECTRICAL CHARACTERISTCS (continued)
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L4909The current protection is a function of the Vce, i.e. the drop between input and output voltages (Vin-Vo). The
shape of that relationship is shown in following figure 1.
Figure 1.
Figure 2. REGULATOR TYPICAL APPLICATION
L4909 6/7
