Datasheet

LTC3785
7
3785fc
block DiagraM
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
2.4V
TSD
1.225V
TG1
BG1
V
OUT
LOW
15mV
OR
1X I
LIMIT
g
m
1/25k
V = 60k/R
ILSET
X10
V = 90k/R
ILSET
UVLO
V
BE
2µA
I
LIM(OUT)
I
LIM(OUT)
10µA MAX
1µA
RUN/SS
C
SS
V
SENSE
V
OUT
FB
RT
MODE
1.5V
SS
I
LIM
COMP
I
MAX
COMP
V
C
1.225V
RUN
V
REF
–6.5%
FAULT
LOGIC
BURST
LOGIC
I
LIMIT
SET
1/2 LIMIT AT V
OUT
< 1V
GND/PGND
1 = Burst Mode OPERATION
0 = FIXED FREQUENCY
100% DUTY
CHARGE PUMP
100% DUTY
CHARGE PUMP
0 = 15mV
1 = I
LIMIT
4.35V REG
SAMPLED
SAMPLED
PGND
1.8V
DISABLE
REVERSE
CURRENT LIMIT
(ZERO LIMIT FOR BURST)
IDEAL DIODE
BBM
SW1
DELAY
V
CC
V
IN
I
LIMIT
V
IN
2.7V TO 10V
I
SVIN
V
BST1
V
BST2
V
OUT
D1
OPT
D2
OPT
C
OUT
L1
TG1
MA C
IN
C
VCC
MB
MD
MC
C
B
C
A
SW1
SW2
SW1
SW2
BG2
V
DRV
PGND
I
SSW2
I
SSW1
I
SVOUT
V
DRV
BG1
TG2
ADRV
I
MAX
SW1
PULSE
SW2
PULSE
TG2
BG2
V
REV
BBM
SW2
DELAY
BDRV
CCM
3785 BD
V
REV
CDRV
DDRV
REVERSE
LIMIT
UV
UV
+
–
+10%
OSC
OV
BURST
OV
1.225V
R2
R1
R
T
R
ILSET
+
–
+
–
I
LSET
+
–
V
OUT
C
P1
23
22
20
21
19
18
16
17
10
12
11
13
14
15
6
25
5
8
7
2
3
4
1
24