Datasheet

 
 
SLVS485 − AUGUST 2003
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4
PIN ASSIGNMENTS
1
DBV PACKAGE
(TOP VIEW)
EN
FB
VIN
3
5GND
SW
ISENSE
2
6
4
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME NO.
I/O
DESCRIPTION
EN 1 I
Enable. A logic low enables the converter, logic high forces the device into shutdown mode reducing the supply current
to less than 1 µA.
FB 3 I Feedback pin. Connect an external voltage divider to this pin to set the output voltage.
GND 2 I Ground
SW 6 O This pin connects to the gate of an external P-channel MOSFET.
ISENSE 4 I Current sense input. Connect the current sense resistor between VIN and ISENSE. (optional)
VIN 5 I Supply voltage input
FUNCTIONAL BLOCK DIAGRAM
_
+
Minimum t
on
Timer
(0.2 µs, 0.4 µs,
0.8 µs, 1.6 µs)
Minimum t
off
Timer
(0.6 µs, 0.3 µs,)
t
on
Regulation
Timer
(3 µs, 15 µs, 16 µs)
Logic
_
+
M
U
X
t
on
Regulator
R
S
Q
Driver
Overcurrent
Comparator
Regulation
Comparator
V
ref
Softstart
105 mV
GND
VIN EN
SW
ISense
FB