LT3487
7
3487f
BLOCK DIAGRA
W
Figure 1. Block Diagram
–
+
A2
–
+
A3
VCN
–
+
A4
–
+
A1
49.2k
VCP
R
X1
SQ
DP
Q1
Q3
DN
DISCONNECT
PNP
ANTISAT
RAMP
GENERATOR
2MHz
OSCILLATOR
1.25V
CAP
C5
V
POS
V
BAT
C4
SWP
V
BAT
L1
R
Q2
X2
SQ
+
3
10
GND
11
SWN
V
BAT
4
DN
5
1
2
R1
RAMP
GENERATOR
C2
V
NEG
3487 BD
C3
L2
L3
+
160mV
49.2k
1.4µA
V
IN
V
BAT
V
REF
1.23V
6
FBP
CAP
9
RUN/SS
8
FBN
V
NEG
7
C1
C6
M1
RUN
R2
C7
–
+
Σ
Σ
