Datasheet

DS2711/DS2712: Loose-Cell NiMH Chargers
3 of 15
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Threshold Voltage,
Thermistor - Min
V
THM-MIN
(Notes 1, 4, 6)
V
DD
x
0.73
V
Threshold Voltage,
Thermistor - Max
V
THM-MAX
(Notes 1, 4, 6) 0.30
V
DD
x
0.33
0.36 V
Threshold Voltage,
Thermistor - Stop
V
THM-STOP
(Notes 1, 4, 6)
V
DD
x
0.29
V
Threshold Current, TMR
Pin Suspend
I
TMR-SUS
0.1 0.5
µA
Presence Test Current,
VP1, VP2
I
PTST
Parallel: V
DD
≥ 4.0V,
Series: V
DD
≥ 4.5V
10 15
µA
Reverse Leakage
Current, VP1, VP2
I
LKGR
V
DD
= 0V, VP1 = 1.5V,
VP2 = 3.0V
2
µA
Current-Sense Reference
Voltage
V
IREF
(Note 1, 4, 7)
125 mV
-6% +6% %
Gain, Current-Sense
Error Amp
G
M
DS2711 (Note 8) 0.9 1.5
Ω
-1
Gain, Current-Sense
Comparator
G
M
DS2712 (Note 8) 10
Ω
-1
Propagation Time,
Current-Sense
Comparator
t
PDLY
DS2712, 2mV
over/underdrive
0.25
µs
Hysteresis, Current-
Sense Comparator
V
HYS-COMP
DS2712 22 24 26 mV
ELECTRICAL CHARACTERISTICS: TIMING
(4.0V ≤ V
DD
≤ 5.5V, T
A
= -20°C to +70°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Internal Timebase Period t
BASE
0.96 s
Internal Timebase
Accuracy
-10 +10 %
Duty Factor, Series Fast
Charge
CC1 0.969
Duty Factor, Series
Precharge/Top-Off
CC1 0.250
Duty Factor, Parallel Fast
Charge
CC1, CC2 0.484
Duty Factor, Parallel
Precharge/Top-Off
CC1, CC2 0.125
Duty Factor, Maintenance
Charge
CC1, CC2 0.0156
Cell Test Interval t
CTST
31 Seconds
Precharge Timeout t
PCHG
V
CELL
< V
BAT-MIN
34 Minutes
Fast-Charge Termination
Hold-Off Period
t
THO
4 Minutes
Fast-Charge Flat Voltage
Timeout
t
FLAT
V
CELL
not increasing 16 Minutes
Charge Timer Period t
CTMR
R
TMR
= 100kΩ
2.5 Hours