Datasheet
LT3971/LT3971-3.3/LT3971-5
9
3971fd
BLOCK DIAGRAM
+
–
+
–
+
–
OSCILLATOR
200kHz TO 2MHz
Burst Mode
DETECT
V
C
CLAMP
V
C
SLOPE COMP
R
V
IN
V
IN
EN
BOOST
SW
SHDN
SWITCH
LATCH
SS
1µA
V
OUT
C2
C3
C4
R3
L1
D1
BD
RT
R2
GND
ERROR AMP
R1
R2
FB
LT3971
ONLY
LT3971-3.3
LT3971-5
ONLY
LT3971-3.3: R1 = 6.39M, R2 = 3.61M
LT3971-5: R1 = 7.62M, R2 = 2.38M
R
T
C1
PG
1.09V
1V
S
Q
V
OUT
3991 BD
INTERNAL 1.19V REF
SYNC
R1
Σ
+
–
SHDN
C5
C5