Datasheet

LTC4155
15
4155fc
BLOCK DIAGRAM
+ – + –
+
–
1.200V
NTC
CLPROG1
CLPROG2
PROG
NTCBIAS
7
T
USBGT USBSNS
w2
4155 BD
SINGLE-CELL LITHIUM-ION
25m EXTERNAL PMOS EX: VISHAY- SILICONIX Si548IDU
AVERAGE USB INPUT AND OTG OUTPUT CURRENT LIMIT CONTROLLER
INPUT UNDERVOLTAGE CURRENT LIMIT CONTOLLER
IDEAL
DIODE
ENABLE
CHARGER
GREATER OF BATSNS OR 3.5V TO SYSTEM LOAD
AUTOMATIC CHARGE CURRENT REDUCTION CONTROLLER
OV UV
+ –
0.9V
+ –
I
2
C
PROGRAMMABLE
MASK
I
2
C
+
TO WALL
ADAPTOR
TO USB
+ – + –
ENABLE
USB OTG
UV OV
V
BUS
V
BUS
V
BUS
WALLSNS
WALLGT
OVGCAP
ID
CHGSNS
CHGSNS
BATGATE
3.5V
BATSNS
V
OUT
V
OUTSNS
V
OUT
DVCC SCL
V
OUT
SDA IRQ
+ –
USB OTG
SHORT
DETECTOR
+ –
USB
ON-THE-GO
BOOST
CONTROL
PWM AND
GATE DRIVE
V
C
4.30V
+ –
+ –
V
OUT
CONTROLLER
4.35V
+ –
V
FLOAT
CONTROLLER
+ –
CHARGE CURRENT CONTROLLER END-OF-CHARGE INDICATION
SW
SW
DV
CC
n
NTC
A/D
I
2
C
2
V
FLOAT
D/A
4.05V to 4.2V
I
2
C
2
C/x
D/A
I
2
C
4
I
CHARGE
D/A
0.15V TO 1.2V