Datasheet

LT3759
8
3759fc
For more information www.linear.com/3759
BLOCK DIAGRAM
M1
1.22V
1.2V
2.5V
C
IN
C
VCC
INTV
CC
DRIVEV
IN
R
SENSE
V
ISENSE
+
I
S1
2µA
10
9
8
1
12
EN/UVLO
BANDGAP
REFERENCE
TSD
~165˚C
A10
Q3
VC
V
C
BG_LOW
UVLO
I
S2
10µA
I
S3
C
C1
C
C2
R
C
DRIVER
SLOPE
SENSE
GND
GATE
50mV
SR1
+
–
RAMP
GENERATOR
+
–
R Q
S
2.5V
RT
R
T
SS
C
SS
SYNC
FREQ
FOLDBACK
1.25V
FBX
PGOOD
FBX
Q4
1.6V
–0.8V
+
–
+
–
2
6
3 5 4
+
–
+
–
7
13
RAMP
PWM
COMPARATOR
FREQUENCY
FOLDBACK
100kHz ~ 1MHz
OSCILLATOR
R1
R2
L2
FBX
D1
C
DC
V
OUT
C
OUT2
C
OUT1
•
+
3759 F01
A1
A2
1.72V
–0.86V
+
–
+
–
A11
A12
+
–
A3
1.25V
FREQ
PROG
–
+
+
Q1
A4
A5
A6
G5
G6
A7
Q2
G4
R3R4
V
IN
11
INTERNAL BIAS
GENERATOR
DRIVE LDO
CURRENT
LIMIT
INTERNAL BIAS
CURRENT
LIMIT
V
IN
LDO
A8
+
–
G8
1.52V
–0.76V
+
–
+
–
A13
A14
G7
2.7V
A15
+
–
G2
G1
•
L1
BG
Figure 1. LT3759 Block Diagram Working as a SEPIC Converter
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