NCP1835 ON Semiconductor, NCP1835 Datasheet - Page 2

• Manufacturer Part Number: NCP1835
• Description: Integrated Li-Ion Charger
• Manufacturer: ON Semiconductor

PIN FUNCTION DESCRIPTION
Pin
10
1
2
3
4
5
6
7
8
9
Symbol
FAULT
TIMER
VSNS
CFLG
V2P8
GND
ISEL
V
BAT
EN
CC
Input Supply Voltage. Provides power to the charger. This pin should be bypassed with at least a 4.7 mF ceramic
capacitor to ground.
An open−drain output indicating fault status. This pin is pulled LOW under any fault conditions. A FAULT condition
resets the counter.
An open−drain output indicating charging or end−of−charge states. The CFLG pin is pulled LOW when the
charger is charging a battery. It is forced open when the charge current drops to I
will be latched until a recharge cycle or a new charge cycle starts.
Connecting a timing capacitor, C
TIMEOUT = 14*C
TIMEOUT. Trickle Charge has a time limit of 1/8 of the TIMEOUT period.
Ground pin of the IC. For thermal consideration, it is recommended to solder the exposed metal pad on the
backside of the package to ground.
Enable logic input. Connect the EN pin to LOW to disable the charger or leave it floating to enable the charger.
2.8 V reference voltage output. This pin outputs a 2.8 V voltage source when an adapter is present. The
maximum loading for this pin is 2.0 mA.
The full charge current (I
I
I
Battery voltage sense pin. Connect this as close as possible to the battery input connection.
Charge current output. A minimum 4.7 mF capacitor is needed for stability when the battery is not attached.
FCHG
EOC
= (0.1*I
GND
= (0.8*10
V
4.7 mF
in
C
FCHG
V
in
in
5
/ R
TIME
) A. For best accuracy, a resistor with 1% tolerance is recommended.
R
ISEL
Figure 1. Typical Application Circuit
80 k
ISEL
/1.0 nF (minute). The total charge for CC and CV mode is limited to the length of
) A, the pre−charge current I
FCHG
CFLG
FAULT
V
ISEL TIMER
CC
) can be set by connecting a resistor, R
http://onsemi.com
TIME
15 nF
C
NCP1835
between this pin and ground to set end−of−charge timeout timer.
T
VSNS
2
V2P8
GND
BAT
EN
Description
PC
= (0.1*I
0.1 mF
C
2p8
FCHG)
Microprocessor
4.7 mF
C
ISEL
out
A and the end−of−charge threshold current
, from the ISEL pin to ground.
EOC
. This high impedance mode