BQ24721 Datasheet, PDF (5/48 Pages) Texas Instruments – ADVANCED MULTI-CHEMISTRY AND MULTI-CELL SYNCHRONOUS SWITCH-MODE CHARGER AND SYSTEM POWER SELECTOR

bq24721
www.ti.com
SLUS683 – NOVEMBER 2005
ELECTRICAL CHARACTERISTICS
8 Vdc ≤ V_(VCC) ≤ 24 Vdc, 0°C ≤ T_J ≤ 125°C, all voltages with respect to AGND (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP
OPERATING CONDITIONS
V_(INOP)
V_(VCC), V_(PVCC), input voltage
operating range
Selector and charger operational.
8
QUIESCENT CURRENT – NO ADAPTER CONNECTED
I_(VCC,PVCC)
VCC and PVCC quiescent
current
I_(VCC,PVCC) = ( I_(VCC) + I_(PVCC) ) at V_(VCC) = V_(PVCC) = 16.8 V
I_(ACP,ACN)
ACP and ACN quiescent
current
I_(ACP,ACN) = ( I_(ACP) + I_(ACN) ) at V_(ACP) = V_(ACN) = V_(VCC) = V_(PVCC) =
16.8 V
I_(BAT)
I_(SRP,SRN)
BAT quiescent current
SRP and SRN quiescent
current
I_(BAT) at V_(BAT) = V_(VCC) = V_(PVCC) = 16.8 V
I_(SRP,SRN) = ( I_(SRP) + I_(SRN) ) at V_(SRP) = V_(SRN) = V_(VCC) = V_(PVCC) =
16.8 V
I_(SYNN,SYNP)
SYNN and SYNP quiescent
current
I_(SYNN,SYNP) = ( I_(SYNN) + I_(SYNP) ) at V_(SYNP) = V_(SYNN) = V_(VCC) =
V_(PVCC) = 16.8 V
I_(SYS)
SYS quiescent current
I_(SYS) at V_(SYS) = V_(VCC) = V_(PVCC) = 16.8 V
I_(PH)
PH quiescent current
I_(PH) at V_(PH) = V_(VCC) = V_(PVCC) = 16.8 V
I_(BTST)
BTST quiescent current
I_(BTST) at V_(BTST) = V_(VCC) = V_(PVCC) = 16.8 V
QUIESCENT CURRENT – ADAPTER CONNECTED AND READY TO CHARGE
I_(VCC,PVCC)
VCC and PVCC quiescent
current
I_(VCC,PVCC) = (I_(VCC) + I_(PVCC) at V_(VCC) = V_(PVCC) = 16.8 V
I_(ACP,ACN)
ACP and ACN quiescent
current
I_(ACP,ACN) = (I_(ACP) + I_(ACN) ) at V_(ACP) = V_(ACN) = V_(VCC) = V_(PVCC) =
16.8 V
I_(BAT)
I_(SRP,SRN)
BAT quiescent current
SRP and SRN quiescent
current
I_(BAT) at V_(BAT) = V_(VCC) = V_(PVCC) = 16.8 V
I_(SRP,SRN) = ( I_(SRP) + I_(SRN) ) at V_(SRP) = V_(SRN) = V_(VCC) = V_(PVCC) =
16.8 V
I_{(SYNN,SYNP,SYS} SYNN, SYNP, and SYS
)
quiescent current
I_{(SYNN,SYNP,SYS)} = ( I_(SYNN) + I_(SYNP) + I_(SYS) ) at V_(SYNP) = V_(SYNN) =
V_(SYS) = V_(VCC) = V_(PVCC) = 16.8 V
I_(PH)
PH quiescent current
I_(PH) at V_(PH) = V_(VCC) = V_(PVCC) = 16.8 V
I_(BTST)
BTST quiescent current
I_(BTST) at V_(BTST) = V_(VCC) = V_(PVCC) = 16.8 V
I_{(VCC_SW)} = I_(VCC)
VCC Current while converter FPWM = 300 kHz, charger on (CHGEN = LO) = ENABLED
I_{(VCC_SW)}
is switching including gate
Qg at HIDRV = Qg at LODRV = 30 nC, [No Load on VREF5]
25
drive current
Gate drive switching current = Qg × FPWM = (30nC + 30nC) ×
300kHz = 18mA
5V REFERENCE LDO VOLTAGE AND AC DETECTION STATUS (VREF5, turns-on when AC detected)
V_VREF5
5V Regulator output voltage
Adapter detected (V_ACDET>V_(ACD)), V_CC> 7 V
0 → 10 mA, source current
4.75
5
V_{VREF5_SAT}
Saturation voltage when
VREF5 is off
Adapter not detected, (V_ACDET< V_(ACD))
0 →– 10 mA, ac adapter inserted, C_O = 1 µF, discharge Load
I_{VREF5_LIM}
Short-circuit current
V_(VREF5) = AGND
20
UNDERVOLTAGE LOCKOUT CIRCUIT
UVLO
Under voltage lockout
threshold
VREF5 rising, POR mode set at VREF5 < V_(UVLO)
3.7
V_(UVLO) hysteresis
VREF5 falling
100
SBS-Like SMBus LOGIC LEVELS
V_IL
Input low threshold level
2.7 V < V_(pull-up) < 5.5 V, SDA and SCL
V_IH
Input high threshold level
2.7 V < V_(pull-up) < 5.5 V, SDA and SCL
2.1
I_bias
Input bias current
2.7 V < V_(pull-up) < 5.5 V, SDA and SCL
ALARM OPEN DRAIN OUTPUTS
V_{(ALARM_sat)}
ALARM output low saturation
level
I_(ALARM) = 5mA
I_lkg(ALARM)
ALARM leakage current
THERMAL SHUTDOWN
V_ALARM = 5V
T_(SHUT)
Thermal shutdown Threshold T_J rising, Charge disabled at T_J > T_(SHUT)
145
T_(SHUTH)
Hysteresis
T_J falling, Charge enabled at T_J < T_(SHUT)– T_(SHUTH)
15
Deglitch time, thermal
shutdown
T_J rising/falling
8
MAX
24
254
1
17
1
1
25
1
1
4.45
815
500
305
321
1
1
5.25
0.3
0.8
1
0.5
1
UNIT
V
µA
µA
µA
µA
µA
µA
µA
µA
mA
µA
µA
µA
µA
µA
µA
mA
V
V
mA
V
mV
V
V
µA
V
µA
°C
°C
ms
5