LT1947
6
1947fa
BLOCK DIAGRA
W
SLOPE 2
+
–
Q2
0.03Ω
1947BD
SW2
∑
+
+
R
S
OSC
Q
SLOPE 1
+
–
Q1
0.01Ω
SW1
∑
+
+
R
S
OSC
V
IN
SHUTDOWN
Q
+
–
5.5µA
REF
OSC
SLOPE 1
3MHz
OSCILLATOR
REF
1.26V REFERENCE
AND
UNDERVOLTAGE
LOCKOUT
SLOPE 2
REF
Q4
Q3
28mV
+–
C
T
V
O2
V
ON
FB2
FB1
+
–
+
–
REF
V
IN
GND SHDN
REF
+
–
