Datasheet

DS2715: NiMH Battery Pack Charge Controller
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Current Sense
Comparator Gain
G
COMP
(Note 7) 10 Ω
-1
AC ELECTRICAL CHARACTERISTICS
(4.5V  V
DD
 16.5V, T
A
= 0C to +70C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
UVLO Debounce Time t
UVLO
10 μs
Current Sense
Comparator Propagation
Delay
t
COMP
(Note 7) 250 ns
Discharge Detect
Propagation Delay
t
DD
From detection of current
reversal
1 μs
Return To Normal
Function (Op-Amp or
Comparator Mode)
t
RNF
Time from reset of discharge
latch
1 μs
R
T
Timing Accuracy t
Rt
(Note 4) -10 +10 %
Internal Clock Accuracy t
BASE
-10 +10 %
ELECTRICAL CHARACTERISTICS: CHARGING
(4.5V  V
DD
 16.5V, T
A
= 0C to +70C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
FAST-CHARGE
Comparator Threshold
V
FC
FAST-CHARGE -127 -121 -115 mV
FAST-CHARGE
Comparator Hysteresis
V
HYS-FC
FAST-CHARGE 31 28 25 mV
TOPOFF and
PRECHARGE
Comparator Threshold
V
TO
TOPOFF and PRECHARGE -38 -33 -28 mV
TOPOFF and
PRECHARGE
Comparator Hysteresis
V
HYS-TO
TOPOFF and PRECHARGE 10 8 6 mV
Discharge Latch Reset
Threshold
V
DCHG-RST
-15 -10 -5 mV
Discharge Latch Set
Threshold
V
DCHG-SET
Reverse current through
sense resistor
5 10 15 mV
Low Battery Detect
Threshold
V
LB
From presence detect into
PRECHARGE
0.95 1.0 1.05 V
Cell Detect Threshold V
DET
1.50 1.55 1.60 V
No Cell Detect Threshold V
OPEN
1.60 1.65 1.70 V
Presence Detect
Threshold Hysteresis
V
HYS-PD
90 100 110 mV
2.88 2.92 2.96 V
Minimum Charge Temp V
THM-MIN
(Note 5, 6)
0 ºC
1.28 1.32 1.36 V
Maximum Charge Temp V
THM-MAX
(Note 5, 6)
45 ºC
1.12 1.16 1.20 V
Over Temp V
THM-STOP
(Note 5, 6)
50 ºC
dT/dt Detect T
TERM
0.425 0.5 0.575 ºC/min