Datasheet

LT3973/LT3973-3.3/LT3973-5
10
3973fa
block Diagram
R
SWITCH LATCH
D
BOOST
D
CATCH
BOOST
OSCILLATOR
200kHz TO 2.2MHz
SLOPE COMP
S
Q
–
+
–
+
–
+
Burst Mode
DETECT
ERROR
AMP
1.09V
SHDN
EN/UVLO
1.21V
C1
V
IN
INTERNAL 1.21V REF
–
+
RT
R
T
PG
FB
R2 R1
V
C
V
OUT
GND
LT3973 ONLY
V
IN
BD
OUT
SW
V
OUT
C2
C3
3973 BD
L1
–
+
+
–
R2 R1
LT3973-3.3 AND LT3973-5 ONLY*
* LT3973-3.3: R1 = 12.72M, R2 = 7.39M LT3973-5: R1 = 15.23M, R2 = 4.88M