EL7564C
Monolithic 4 Amp DC:DC Step-down Regulator
junction temperature TJ (°C) can be deducted from the
following relation:
comparator. A logic high on the PG output indicates that
the regulated output voltage is within about +10% of the
nominal selected output voltage.
1.2 – VTJ
-----------------------
= 75 +
T
J
0.00384
Power Tracking
The power tracking pins STP and STN are the inputs to
a comparator, whose HI output forces the PWM control-
ler to skip switching cycle.
Where VTJ is the voltage at VTJ pin in volts.
Power Good and Power On Reset
During power up the output regulator will be disabled
until VIN reaches a value of approximately 4V. About
500mV hysteresis is present to eliminate noise-induced
oscillations.
1. Linear Tracking
In this application, it is always the case that the lower
voltage supply VC tracks the higher output supply VP.
Please see Figure 2 below.
Under-voltage and over-voltage conditions on the regu-
lator output are detected through an internal window
1
2
20
19
15
14
13
12
11
6
V
C
7
EL7564C
8
V
P
9
+
-
10
V
OUT
V
C
1
2
20
19
15
14
13
12
11
TIME
6
V
P
7
EL7564C
8
9
+
-
10
Figure 2. Linear Power Tracking
11
ELANTEC [ ELANTEC SEMICONDUCTOR ]
