Datasheet

bq24620
www.ti.com SLUS893A –MARCH 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
CHARGE OVERCURRENT COMPARATOR (CYCLE-BY-CYCLE)
Current rising, in non-synchronous mode, measure
45.5 mV
on V
(SRP-SRN)
, V
SRP
< 2 V
Charge overcurrent, falling threshold
Current rising, as percentage of V
(IREG_CHG)
, in
160%
synchronous mode, V
SRP
> 2.2 V
V
OC
Minimum OCP threshold in synchronous mode,
Charge overcurrent, threshold floor 50 mV
measure on V
(SRP-SRN)
, V
SRP
> 2.2 V
Maximum OCP threshold in synchronous mode,
Charge overcurrent, threshold ceiling 180 mV
measure on V
(SRP-SRN)
, V
SRP
> 2.2 V
CHARGE UNDER-CURRENT COMPARATOR (CYCLE-BY-CYCLE)
V
ISYNSET
Charge undercurrent, falling threshold Switch from STNCH to NON-SYNCH, V
SSP
> 2.2 V 1 5 9 mV
BATTERY SHORTED COMPARATOR (BATSHORT)
BAT short falling threshold, forced
V
BATSHT
V
SRP
falling 2 V
non-syn mode
V
BATSHT_HYS
BAT short rising hysteresis 200 mV
V
BATSHT_DEG
Deglitch on both edges 1 μs
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 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
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
SAFETY TIMER
T
PRECHG
Precharge safety timer range
(1)
Precharge time before fault occurs 1440 1800 2160 sec
T
CHARGE
Internal fast-charge safety timer
(1)
4.25 5 5.75 Hr
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 (relative to V
REG
) Voltage on VFB to detect battery absent during wake 125 mV
Voltage on VFB to detect battery absent during
V
DISCH
Discharge threshold 0.35 V
discharge
PWM HIGH SIDE DRIVER (HIDRV)
High-side driver (HSD) turn-on
R
DS_HI_ON
V
BTST
– V
PH
= 5.5 V 3.3 6 Ω
resistance
R
DS_HI_OFF
High-side driver turn-off resistance V
BTST
– V
PH
= 5.5 V 1 1.3 Ω
Bootstrap refresh comparator threshold V
BTST
– V
PH
when low-side refresh pulse is
V
BTST_REFRESH
4 4.2 V
voltage requested
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
PWM DRIVERS TIMING
Dead time when switching between LSD and HSD,
Driver dead time 30 ns
no load at LSD and HSD
(1) Verified by design
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