Electrical Characteristics (Continued)
V
IN
= 5V; T
J
= 25°C; unless otherwise specified
Symbol
V
UV
V
UVHYS
V
MSD
V
ASD
I
TERM
V
PROG
I
CHRG
V
CHRG
ΔV
RECHRG
T
LIM
t
SS
t
RECHARGE
t
TERM
I
PROG
Parameter
V
CC
Undervoltage Lockout Threshold
V
CC
Undervoltage Lockout Hysteresis
Manual Shutdown Threshold Voltage
PROG Pin Rising
PROG Pin Falling
V
CC
– V
BAT
Lockout Threshold Voltage
C/10 Termination Current Threshold
V
CC
from Low to High
V
CC
from High to Low
R
PROG
= 10k
(4)
R
PROG
= 2k
PROG Pin Voltage
CHRG Pin Weak Pull-Down Current
CHRG Pin Output Low Voltage
Recharge Battery Threshold Voltage
Thermal Protection Temperature
Soft-Start Time
Recharge Comparator Filter Time
Termination Comparator Filter Time
PROG Pin Pull-Up Current
I
BAT
= 0 to 1000V/R
PROG
V
BAT
High to Low
I
BAT
Falling Below I
CHG
/10
R
PROG
= 10k, Current Mode
V
CHRG
= 3V
I
CHRG
= 5mA
V
FLOAT
- V
RECHRG
0.9
Conditions
From V
CC
Low to High
Min
Typ
3.4
100
1.25
1.2
100
30
0.1
0.1
1.03
15
0.6
100
120
100
1
1000
1
1.1
Max
Unit
V
mV
V
V
mV
mV
mA/mA
mA/mA
V
µA
V
mV
°C
µs
ms
µs
µA
Note 1:
Exceeding the absolute maximum rating may damage the device.
Note 2:
The device is not guaranteed to function outside its operating rating.
Note 3:
Supply current includes PROG pin current (approximately 100µA) but does not include any current delivered to the battery
through the BAT pin (approximately 100mA).
Note 4:
I
TERM
is expressed as a fraction of measured full charge current with indicated PROG resistor.
Pin Functions
Pin
Pin Function Description
P Positive Input Supply Voltage. Provides
power to the charger. VCC can range
from 4.25V to 6.5V and should be
bypassed with at least a 1μF capacitor.
Pin
Pin Function Description
Open-Drain Charge Status Output. When the battery is charging, the
CHRG pin is pulled low by an internal N-channel MOSFET. When the
charge cycle is completed, a weak pull-down of approximately 20uA is
connected to the CHRG pin, indicating an “AC present” condition.
VCC
CHRG
GND
Ground.
PROG
Charge Current Program, Charge Current Monitor and Shutdown Pin.
Charge Current Output. Provides
BAT
charge current to the battery and
regulates the final float voltage to 4.2V.
Revision 6/7/2007
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2007. • www.seawardinc.com • Page 3
SEAWARD [ Seaward Electronics Inc. ]
