BQ24620 Datasheet, PDF (6/30 Pages) Texas Instruments – Stand-Alone Synchronous Switch-Mode Lithium Phosphate Battery Charger with Low Iq

bq24620
SLUS893 – MARCH 2010
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ELECTRICAL CHARACTERISTICS (continued)
5.0V ≤ V(VCC) ≤ 28V, 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
CHARGE OVER-CURRENT COMPARATOR (CYCLE-BY-CYCLE)
Current rising, in non-synchronous mode, measure
Charge over-current falling threshold
on V_(SRP-SRN), V_SRP < 2 V
Current rising, as percentage of V_{(IREG_CHG)}, in
V_OC
Charge over-current threshold floor
synchronous mode, V_SRP > 2.2V
Minimum OCP threshold in synchronous mode,
measure on V_(SRP-SRN), V_SRP > 2.2V
Charge over-current threshold ceiling
Maximum OCP threshold in synchronous mode,
measure on V_(SRP-SRN), V_SRP > 2.2V
CHARGE UNDER-CURRENT COMPARATOR (CYCLE-BY-CYCLE)
45.5
160%
50
180
V_ISYNSET
Charge under-current falling threshold Switch from STNCH to NON-SYNCH, V_SSP > 2.2 V
1
5
9
BATTERY SHORTED COMPARATOR (BATSHORT)
V_BATSHT
BAT Short falling threshold, forced
non-syn mode
V_SRP falling
2
V_{BATSHT_HYS} BAT short rising hysteresis
200
V_{BATSHT_DEG} Deglitch on both edge
1
LOW CHARGE CURRENT COMPARATOR
V_LC
Average low charge current falling
threshold
Measure on V_(SRP-SRN), forced into non-synchronous
mode
1.25
V_{LC_HYS}
Low charge current rising hysteresis
V_{LC_DEG}
Deglitch on both edge
VREF REGULATOR
1.25
1
V_{VREF_REG}
I_{VREF_LIM}
VREF regulator voltage
VREF current limit
V_VCC > V_UVLO (0 – 35 mA Load)
V_VREF = 0 V, V_VCC > V_UVLO
REGN REGULATOR
3.267
3.3
35
3.333
V_{REGN_REG}
I_{REGN_LIM}
REGN regulator voltage
REGN current limit
T_PRECHG
T_CHARGE
Precharge safety timer range⁽¹⁾
Internal fast charge safety timer⁽¹⁾
BATTERY DETECTION
V_VCC > 10 V, CE = HIGH (0 – 40 mA Load)
V_REGN = 0 V, V_VCC > V_UVLO
SAFETY TIMER
Precharge time before fault occurs
5.7
6.0
40
1440
4.25
1800
5
6.3
2160
5.75
t_WAKE
I_WAKE
t_DISCHARGE
I_DISCHARGE
I_FAULT
V_WAKE
Wake timer
Wake Current
Discharge timer
Discharge current
Fault current after a timeout fault
Wake threshold ( w.r.t. V_REG)
Max time charge is enabled
R_SENSE = 10 mΩ
Max time discharge current is applied
Voltage on VFB to detect battery absent during
Wake
500
50 125
200
1
8
2
125
V_DISCH
Discharge threshold
Voltage on VFB to detect battery absent during
Discharge
0.35
PWM HIGH SIDE DRIVER (HIDRV)
R_{DS_HI_ON}
High Side driver (HSD) turn-on
resistance
V_BTST – V_PH = 5.5 V
3.3
6
R_{DS_HI_OFF}
High Side driver turn-off resistance
V_{BTST_REFRESH}
Bootstrap refresh comparator threshold
voltage
V_BTST – V_PH = 5.5 V
V_BTST – V_PH when low side refresh pulse is
requested
1
1.3
4
4.2
PWM LOW SIDE DRIVER (LODRV)
R_{DS_LO_ON}
Low side driver (LSD) turn-on
resistance
4.1
7
R_{DS_LO_OFF}
Low side driver turn-off resistance
PWM DRIVERS TIMING
1
1.4
Driver dead time
Dead time when switching between LSD and HSD,
no load at LSD and HSD
30
(1) Verified by design
UNIT
mV
mV
mV
mV
V
mV
ms
mV
mV
ms
V
mA
V
mA
sec
Hr
ms
mA
sec
mA
mA
mV
V
Ω
Ω
V
Ω
Ω
ns
6
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