MCP73861/2/3/4
Typical Application
1.2A Lithium-Ion Battery Charger
5V
4.7µF
2, 3
1
14
16
15
5
V
DD
V
SET
EN
V
BAT3
12
10, 11
V
BAT
4.7 µF
THREF 6
7 6.19 kΩ
STAT1 THERM
7.32 kΩ
8
STAT2 TIMER
0.1
µF
V
SS
4, 9, 13
PROG
+
Single
Lithium-Ion
–
Cell
MCP73861/3
Functional Block Diagram
Direction
Control
V
DD1
V
DD2
G = 0.001
4 kΩ
V
REF
1 kΩ
PROG
90
kΩ
Charge Current
Control Amplifier
+
–
11 kΩ
V
REF
110 kΩ
10 kΩ
+
–
V
UVLO
Charge
Termination
Comparator
+
–
10 kΩ
V
DD
V
BAT1
V
BAT2
Voltage Control
Amplifier
+
–
V
REF
Charge_OK
Precon
Precondition
Comp.
+
–
600 kΩ
(1.65 MΩ)
V
BAT3
I
REG
/12
U
VLO
COMPARATOR
Precondition
Control
148.42 kΩ
Constant-Voltage/
Recharge Comp.
–
+
Power-On
Delay
V
REF
300.04 kΩ
V
UVLO
V
REF
(1.2V)
10.3 kΩ
(8.58 kΩ)
Drv Stat 1
I
REG
/12
Oscillator
Charge Control,
Charge Timers
And Status Logic
Drv Stat 2
Charge_OK
1.58 kΩ
Values in ( )
reflect the
MCP73862/4
devices
EN
Bias and
Reference
Generator
V
SET
THREF
100 kΩ
THERM
50 kΩ
+
–
50 kΩ
TIMER
+
–
Temperature
Comparators
V
SS1
V
SS2
V
SS3
STAT1
STAT2
DS21893C-page 2
©
2005 Microchip Technology Inc.
MICROCHIP [ MICROCHIP TECHNOLOGY ]
