Datasheet

LTC4081
10
4081f
BLOCK DIAGRA
W
Figure 1. LTC4081 Block Diagram
–+
–+
6
MP4
MP3 MP1
X1 X400
V
CC
R1
R2
CHARGER
ENABLE
CHRG
PROG
11
GND
4081 BD
1V
0.1V
PROG
C1
0.1V
D3
D2
D1
1.22V
–+
CA
MA
–+
VA
1
10
7
2
BAT
SW
0.8V
L1
V
OUT
C
OUT
R8
C
PL
FB
COUNTER
LOGIC
CHARGER
OSCILLATOR
CHARGE
CONTROL
+
–
2.9V
BAT
BADBAT
UVLO
SUSPEND
–
+
C3
C2
EN_CHRG
R
EN
0.82V
CHARGER
SHUTDOWN
3
–
+
C6
0.82V
ENABLE BUCK
EN_BUCK
MODE
9
–
+
C7
0.82V
8
PWM
CONTROL
AND DRIVE
–
+
2.25MHz
BUCK
OSCILLATOR
ERROR
AMP
LINEAR BATTERY CHARGER
SYNCHRONOUS BUCK CONVERTER
MN1
R7
MP2
R
PROG
+
–
115°C
T
DIE
TA
PULSE
LOGIC
4
R
NOM
R
NTC
V
CC
V
CC
–
+
–
+
–
+
TOO COLD
TOO HOT
NTC_EN
R9
C8
C9
C10
R10
R11
R12
5
NTC
–
+
–
+
C4
C5
V
BAT
+ 80mV
V
CC
3.6V
T