Datasheet

bq24630
www.ti.com SLUS894A –JANUARY 2010– REVISED OCTOBER 2011
ELECTRICAL CHARACTERISTICS (continued)
5 V ≤ V
VCC
≤ 28 V, 0°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 UNIT
LOW CHARGE CURRENT COMPARATOR
Average low charge current falling Measure on V
(SRP-SRN)
, forced into non-synchronous
V
LC
1.25 mV
threshold mode
V
LC_HYS
Low charge current rising hysteresis 1.25 mV
V
LC_DEG
Deglitch on both edge 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
REGN REGULATOR
V
REGN_REG
REGN regulator voltage V
VCC
> 10 V, CE = HIGH (0–40 mA load) 5.7 6 6.3 V
I
REGN_LIM
REGN current limit V
REGN
= 0 V, V
VCC
> V
UVLO
40 mA
TTC INPUT
T
PRECHG
Precharge safety timer range
(1)
Precharge time before fault occurs 1440 1800 2160 s
Fast-charge saftey timer range, with ±10%
T
CHARGE
Tchg = C
TTC
× K
TTC
1 10 h
accuracy
(1)
Fast charge timer accuracy
(1)
0.047 μF ≤ C
TTC
≤ 0.47 μF –10% 10%
K
TTC
Timer multiplier 1.4 min/nF
V
TTC
below this threshold disables the safety timer and
TTC low threshold 0.4 V
termination
TTC comparator high threshold 1.5 V
TTC comparator low threshold 1 V
TTC source/sink current 45 50 55 μA
BATTERY SWITCH (BATFET) DRIVER
R
DS_BAT_OFF
BATFET turnoff resistance V
ACN
> 5 V 150 Ω
R
DS_BAT_ON
BATFET turnon resistance V
ACN
> 5 V 20 kΩ
V
BATDRV_REG
= V
ACN
– V
BATDRV
when V
ACN
> 5 V and
V
BATDRV_REG
BATFET drive voltage 4.2 7 V
BATFET is on
AC SWITCH (ACFET) DRIVER
R
DS_AC_OFF
ACFET turnoff resistance V
VCC
> 5 V 30 Ώ
R
DS_AC_ON
ACFET turnon resistance V
VCC
> 5 V 20 kΏ
V
ACDRV_REG
= V
VCC
– V
ACDRV
when V
VCC
> 5 V and
V
ACDRV_REG
ACFET drive voltage 4.2 7 V
ACFET is on
AC / BAT MOSFET DRIVERS TIMING
Driver dead time Dead time when switching between AC and BAT 10 μs
BATTERY DETECTION
t
WAKE
Wake timer Max. time charge is enabled 500 ms
I
WAKE
Wake current R
SENSE
= 10 mΩ 50 125 200 mA
t
DISCHARGE
Discharge timer Max time discharge current is applied 1 sec
I
DISCHARGE
Discharge current 8 mA
I
FAULT
Fault current after a timeout fault 2 mA
V
WAKE
Wake threshold (with respect to V
REG
) Voltage on VFB to detect battery absent during wake 125 mV
V
DISCH
Discharge threshold Voltage on VFB to detect battery absent during discharge 0.35 V
PWM HIGH SIDE DRIVER (HIDRV)
R
DS_HI_ON
High Side driver (HSD) turnon resistance V
BTST
– V
PH
= 5.5 V 3.3 6 Ω
R
DS_HI_OFF
High Side driver turnoff resistance V
BTST
– V
PH
= 5.5 V 1 1.3 Ω
Bootstrap refresh comparator threshold
V
BTST_REFRESH
V
BTST
– V
PH
when low side refresh pulse is requested 4 4.2 V
voltage
PWM LOW SIDE DRIVER (LODRV)
R
DS_LO_ON
Low side driver (LSD) turnon resistance 4.1 7 Ω
R
DS_LO_OFF
Low side driver turnoff resistance 1 1.4 Ω
(1) Verified by design
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