BQ24085 Datasheet, PDF (5/34 Pages) Texas Instruments – 750 mA SINGLE-CHIP Li-Ion/Li-Pol CHARGE MANAGEMENT IC WITH THERMAL REGULATION

bq24085, bq24086
bq24087, bq24088
www.ti.com .................................................................................................................................................... SLUS784B – DECEMBER 2007 – REVISED MAY 2008
ELECTRICAL CHARACTERISTICS (Continued)
over recommended operating, T_J = 0–125°C range, See the Application Circuits section, typical values at T_J = 25°C (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
CHARGE TERMINATION DETECTION, V_O(REG) = 4.2 V, CHARGER ENABLED, NO FAULT CONDITIONS DETECTED, Thermal
regulation LOOP NOT ACTIVE, R_TMR = 50K or TMR pin OPEN
I_(TERM)
Termination detection current
range
V_(BAT) > V_(RCH), I_(TERM) = K_(SET) × V_(TERM)/R_(ISET)
5
75 mA
V_(TERM)
Charge termination detection
set voltage⁽¹⁾
V_(BAT) > V_(RCH)
225
250
275 mV
t_DGL(TERM)
Deglitch time, termination
detected
V_(ISET) decreasing
50
ms
BATTERY RECHARGE THRESHOLD
V_(RCH)
t_DGL(RCH)
Recharge threshold detection
Deglitch time, recharge
detection
[V_O(REG)–V(BAT) ] > V_(RCH)
V_(BAT) decreasing
75
100
135 mV
350
ms
TIMERS, CE = LO, CHARGER ENABLED, NO FAULT CONDITIONS DETECTED, V(TMR) < 3 V, TIMERS ENABLED
t_(CHG)
K_(CHG)
t_(PCHG)
Charge safety timer range
Charge safety timer constant
Pre-charge safety timer range
t_(CHG) = K_(CHG) × R_TMR ; thermal loop not active
V_(BAT) > V_(LOWV)
t_(PCHG) = K_(PCHG) × t_(CHG) ; Thermal regulation loop
not active
3
0.08
1080
10 hours
0.1
0.12 hr/kΩ
3600 sec
K_(PCHG)
Pre-charge safety timer
constant
V_(BAT) < V_(LOWV)
0.08
0.1
0.12
V_TMR(OFF)
Charge timer and termination
enable threshold
Charge timer AND termination
disabled at: V_(TMR) >
V_TMR(OFF)
bq24085/86/88
2.5
Charge timer enable threshold
Charge timer disabled at:
V_(TMR) > V_TMR(OFF)
bq24087
BATTERY DETECTION THRESHOLDS
3
3.5 V
I_DET(DOWN)
I_DET(UP)
Battery detection current (sink)
Battery detection current
(source)
2 V < V_(BAT) < V_O(REG)
2 V < V_(BAT) < V_O(REG)
1
2
I_O(PRECHG)
3.2 mA
t_(DETECT)
Battery detection time
TIMER FAULT RECOVERY
2 V < V_(BAT) < V_O(REG), Thermal regulation loop not
active; R_TMR = 50 kΩ, I_DET(down) or I_{DET (UP)}
125
ms
I_(FAULT)
Fault Current (source)
V_(OUT) < V_(RCH)
OUTPUT CURRENT SAFETY LIMIT, V_(IN) ≥ 4.5 V, CHARGER ENABLED, ISET SHORTED TO GND
I_(SETSC)
Charge overcurrent safety
V_(ISET) = VSS
0.8
1.1 mA
1.5
A
(1) The voltage on the ISET pin is compared to the V_(TERM) voltage to determine when the termination should occur.
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