Datasheet

bq24650
www.ti.com SLUSA75 –JULY 2010
ELECTRICAL CHARACTERISTICS (continued)
5.0V ≤ V
VCC
≤ 28V, –40°C < T
J
+ 125°C, typical values are at T
A
= 25°C, with respect to GND (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
BAT LOWV COMPARATOR
Precharge to fast charge transition (LOWV
V
LOWV
Measure on VFB pin 1.54 1.55 1.56 V
threshold)
V
LOWV_HYS
LOWV hysteresis 100 mV
LOWV rising deglitch VFB falling below V
LOWV
25 ms
LOWV falling deglitch VFB rising above V
LOWV
+ V
LOWV_HYS
25 ms
RECHARGE COMPARATOR
V
RECHG
Recharge threshold (with respect to V
REG
) Measure on VFB pin 35 50 65 mV
Recharge rising deglitch VFB decreasing below V
RECHG
10 ms
Recharge falling deglitch VFB increasing above V
RECHG
10 ms
BAT OVER-VOLTAGE COMPARATOR
V
OV_RISE
Over-voltage rising threshold As percentage of V
FB
104%
V
OV_FALL
Over-voltage falling threshold As percentage of V
FB
102%
INPUT OVER-VOLTAGE COMPARATOR (ACOV)
V
ACOV
AC over-voltage rising threshold on VCC 31 32 33 V
V
ACOV_HYS
AC over-voltage falling hysteresis 1 V
AC over-voltage deglitch (both edges) Delay to changing the STAT pins 1 ms
AC over-voltage rising deglitch Delay to disable charge 1 ms
AC over-voltage falling deglitch Delay to resume charge 20 ms
THERMAL SHUTDOWN COMPARATOR
T
SHUT
Thermal shutdown rising temperature Temperature increasing 145 °C
T
SHUT_HYS
Thermal shutdown hysteresis 15 °C
Thermal shutdown rising deglitch Temperature increasing 100 µs
Thermal shutdown falling deglitch Temperature decreasing 10 ms
THERMISTOR COMPARATOR
V
LTF
Cold temperature rising threshold 72.5% 73.5% 74.5%
V
LTF_HYS
Rising hysteresis 0.2% 0.4% 0.6%
As percentage to V
VREF
V
HTF
Hot temperature rising threshold 46.7% 47.5% 48.3%
V
TCO
Cut-off temperature rising threshold 44.3% 45% 45.7%
Deglitch time for temperature out of range V
TS
< V
LTF
, or V
TS
< V
TCO
, or
400 ms
detection V
TS
< V
HTF
Deglitch time for temperature in valid range V
TS
> V
LTF
– V
LTF_HYS
or V
TS
>V
TCO
, or V
TS
>
20 ms
detection V
HTF
CHARGE OVER-CURRENT COMPARATOR (CYCLE-BY-CYCLE)
Current rising, in synchronous mode measure
V
OC
Charge over-current rising threshold 80 mV
(V
SRP
– V
SRN
)
CHARGE UNDER-CURRENT COMPARATOR (CYCLE-BY-CYCLE)
V
ISYNSET
Charge under-current falling threshold Switch from CCM to DCM, V
SRP
> 2.2V 1 5 9 mV
BATTERY SHORTED COMPARATOR (BATSHORT)
BAT short falling threshold, forced
V
BATSHT
V
SRP
falling 2 V
non-synchronous mode
V
BATSHT_HYS
BAT short rising hysteresis 200 mV
t
BATSHT_DEG
Deglitch on both edges 1 µs
LOW CHARGE CURRENT COMPARATOR
V
LC
Low charge current falling threshold Measure V
(SRP-SRN)
1.25 mV
V
LC_HYS
Low charge current rising hysteresis 1.25 mV
t
LC_DEG
Deglitch on both edges 1 µs
VREF REGULATOR
V
VREF_REG
VREF regulator voltage V
VCC
> V
UVLO
, 0 – 35 mA load 3.267 3.3 3.333 V
I
VREF_LIM
VREF current limit V
VREF
= 0 V, V
VCC
> V
UVLO
35 mA
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