Datasheet

10
LTC4221
4221fa
BLOCK DIAGRA
W
26V
9.5μA
100μA
CPO2
V
CC2
CUR_LIMIT2
FPD2
+
–
CHARGE
PUMP 1
CHARGE
PUMP 2
UVLO
OSCILLATOR
V
CC1
V
CC1
V
CC2
CPO1
CPO2
0.821V
ON1
COMPARATOR
SYSTEM
CONTROL
LOGIC
0.4V
V
CC1
1
ON1
+
–
ON2
COMPARATOR
FILTER
COMPARATOR
TMRHI
COMPARATOR
FAULT
COMPARATOR
0.821V
FTRHI
TMRHI
TIMER
1.234V
FAULT_LO
105μA
1.8μA
+
–
+
–
1.24V
0.816V
+
–
0.617V
+
–
OV1
COMPARATOR
FB1
COMPARATOR
0.822V
+
–
16
9
ON2
8
FILTER
V
CC1
3.8μA
V
CC1
V
CC1
FAULT
7
GND
10
GATE1
26V
PWRGD1
CHANNEL ONE
20μA1.9μA
V
CC1
V
CC1
9.5μA12V
12V
100μA
CPO1
V
CC1
CUR_LIMIT1
FPD1
TMRLO
COMPARATOR
TMRLO
0.4V
+
–
+
–
SLOW
COMPARATOR 1
CHANNEL 1
CONTROL
LOGIC
SLOWHI1
9mV TO 25mV
FASTHI1
2
V
CC1
+
–
FAST
COMPARATOR 1
GATELO1
COMPARATOR
GATELO1
0.4V
+
–
SENSE1
+
–
V
CC1
100mV
+
–
3
FB1
5
6
4
0.617V
+
–
OV2
COMPARATOR
FB2
COMPARATOR
0.822V
+
–
V
CC2
GATE2
PWRGD2
4221 BD
CHANNEL TWO
+
–
SLOW
COMPARATOR 2
CHANNEL 2
CONTROL
LOGIC
SLOWHI2
9mV TO 25mV
FASTHI2
15
V
CC2
+
–
FAST
COMPARATOR 2
GATELO2
COMPARATOR
GATELO2
0.4V
+
–
SENSE2
+
–
V
CC2
100mV
+
–
14
FB2
12
11
13