Datasheet

© 2007-2011 Microchip Technology Inc. DS22071B-page 3
MCP73837/8
Functional Block Diagram (MCP73837/8)
REFERENCE,
BIAS, UVLO,
AND SHDN
V
REF
(1.21V)
S
TAT1
P
ROG1
V
BAT
SENSEFET
G=0.001
V
SS
DIRECTION
CONTROL
175k
+
-
PRECONDITION
+
-
TERM
+
-
111k
+
-
CA
10k
157.3k
6k
48k
470.6k
CHARGE
+
-
+
-
VA
72.7k
310k
1k
+
-
CURRENT
LIMIT
+
-
LTVT
+
-
HTVT 470.6k
121k
THER
M
50μA
CHARGE
CONTROL,
TIMER,
AND
STATUS
LOGIC
S
TAT2
P
G (TE)
LDO
1M
175k
DIRECTION
CONTROL
6μA
10k 2k
100mA/500mA
SENSEFET
G=0.001
SENSEFET
G=0.001
SENSEFET
G=0.001
V
REF
AC/USB
AC/USB
VO
REG
VO
REG
VO
REG
UVLO
VO
REG
P
ROG2
V
AC
V
USB