Datasheet

LTC3783
8
3783fb
BLOCK DIAGRAM
PIN FUNCTIONS
I
TH
(Pin 15): Error Amplifier Output/Compensation Pin. The
current comparator input threshold increases with this control
voltage, which is the output of the g
m
type error amplifier.
Nominal voltage range for this pin is 0V to 1.40V.
RUN (Pin 16): The RUN pin provides the user with an ac-
curate means for sensing the input voltage and program-
ming the start-up threshold for the converter. The falling
RUN pin threshold is nominally 1.248V and the comparator
has 100mV hysteresis for noise immunity. When the RUN
pin is grounded, the IC is shut down and the V
IN
supply
current is kept to a low value (20µA typ).
Exposed Pad (Pin 17): Ground Pin. Solder to PCB ground
for electrical contact and rated thermal performance.
OSCV-TO-I
V-TO-I
LDO
BIAS AND
START-UP
9
+
–
–
+
–
LOGIC
V
REF
BIAS
SLOPE
COMP
TEMP
SENSOR
(165°C)
OT
SS_RESET
Q0.615V
FREQ
GATE
12
SENSE
8
PWMOUT
11
V
IN
16
RUN
3738 BD
UV
ITRIP
17
GND
4
V
REF
S
R
OV
CLK
SLEEP
EN
OV/FB
V
REF
1
S
0
5
SYNC
6
I
LIM
3
FBP
FBN
2
1
OV/FB
14
SS
13
+
–
50mA
0.2V
+
–
+
–
IMAX
0.15V
+
–
V
REF
+
–
1.9V
IVMODE
V
REF
+
–
I
TH
15
PWMIN
7
2.23V
V
REF
+
–
INTV
CC
10
A
EA