eorex
EP3102
Pin Assignment
Ordering Information
EP3102 - X X X
Buck Regulator
Package
VOUT
Packing
S : SOP-8L
Blank: Adj
R: Taping & Reel
B: Bag
33 = 3.3V
50 = 5.0V
12 = 12V
Pin Description
Pin
1
Name
VIN
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 (+VIN-VSAT) and
approximately-0.5V, with a duty cycle of approximately VOUT/VIN. To
minimize coupling to sensitive circuitry, the PC board copper area
connected to this pin should be kept a minimum.
2
3
SW
FB
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.
4
EN
5~8
GND
Circuit ground.
Nov. 2006
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