eorex
Pin Assignment
EP3102
Ordering Information
EP3102 - X X X
Buck Regulator
Package
S : SOP-8L
V
OUT
Blank: Adj
33 = 3.3V
50 = 5.0V
12 = 12V
Packing
R: Taping & Reel
B: Bag
Pin Description
Pin
1
Name
V
IN
Function
This is the positive input supply for the IC switching regulator. A suitable
input bypass capacitor must be present at this pin to minimize voltage
transients and to supply the switching currents needed by the regulator.
Internal switch. The voltage at this pin switches between (+V
IN
-V
SAT
) and
approximately-0.5V, with a duty cycle of approximately V
OUT
/V
IN
. To
minimize coupling to sensitive circuitry, the PC board copper area
connected to this pin should be kept a minimum.
Senses the regulated output voltage to complete the feedback loop.
Low enable. Allows the switching regulator circuit to be shutdown using
logic level signals thus dropping the total input supply current to
approximately 150uA. Pulling this pin below a threshold voltage of
approximately 1.3V turns the regulator on, and pulling this pin above
1.3V (up to a maximum of 40V) shuts the regulator down. If this
shutdown feature is not needed, the
EN
pin can be wired to the ground
pin or it can be left open, in either case the regulator will be in the ON
condition.
Circuit ground.
2
SW
3
FB
4
EN
5~8
GND
Nov. 2006
2/10
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