LTC4020_15 Datasheet, PDF (15/42 Pages) Linear Technology – 55V Buck-Boost Multi-Chemistry Battery Charger

BLOCK DIAGRAM
LTC4020
CSOUT
RNG/SS
50µA
100k ^0.7µA
TRICKLE
1.75V
+
–
VFB
–
VFLOAT
270µ
+
2.5V
V_{IN_REG}
50µA
NTC
–
270µ
+
+
2V
V_40C
–
–
+
V_0C
TIMER
–
+
240µ
+
A_(V) = 20
9.3µA
–
+
0.1V
–
+
2.075V
–
+
2.4375V
INSTANT-ON
FOLDBACK
DISABLE
CHARGER
0.45V 14mV
+
IDEAL
–^DIODE
C/10
BULK
CHARGER
ENABLED
2.125V
+
INSTANT
– ^ON
RESTART
C/10
CC/CV
V_REF
TRICKLE
BULK
RESTART
TERMINATION
AND CONTROL
LOGIC
+
TIMER/
OSCILLATOR
IC
ACTIVE
CSP
1.75V
CSN
BGATE
V_FBMIN
BAT
ITH
STAT1
STAT2
MODE
FBG
4020 BDb
Battery Charger Block Diagram
For more information www.linear.com/LTC4020
4020fb
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