Datasheet

LTC3834
9
3834fb
FUNCTIONAL DIAGRAM
PIN FUNCTIONS
(FE/UFD)
operation. Tying this pin to a voltage greater than 0.9V and
less than INTV
CC
selects pulse-skipping operation.
PHASMD (Pin 20/Pin 18): Control Input to Phase Selector
which determines the phase relationships between TG and
the CLKOUT signal.
Exposed Pad (Pin 21/Pin 21): SGND. Must be soldered
to the PCB.
SWITCH
LOGIC
+
–
4.7V
V
IN
V
IN
INTV
CC
– 0.5V
INTV
CC
0.8V
FC
10k
BURSTEN
CLK
+
–
+
–
–
+
–
+
INTERNAL
SUPPLY
R
LP
C
LP
PLLIN/MODE
EXTV
CC
INTV
CC
SGND
+
5.25V/
7.5V
LDO
SW
SHDN
SLEEP
0.4V
TOP
BOOST
TG
C
B
C
IN
D
D
B
PGND
BOT
BG
INTV
CC
INTV
CC
V
IN
C
OUT
V
OUT
3834 FD
R
SENSE
R
B
V
FB
DROP
OUT
DET
BOT
TOP ON
S
R
Q
Q
OSCILLATOR
PHASE DET
PLLLPF
PLLIN/
MODE
FC
BURSTEN
EA
0.88V
0.80V
TRACK/SS
OV
V
FB
0.5μA
1μA
6V
R
A
–
+
R
C
TRACK/SS
I
TH
C
C
C
C2
C
SS
2(V
FB
)
0.45V
SLOPE
COMP
6mV
+
–
–
+
SENSE
–
SENSE
+
ICMP IR
B
RUN
+– –+
PHASMD
CLKOUT
F
IN
+
–
+
–
PGOOD
V
FB1
0.88V
0.72V
L
SHDN