Datasheet

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ELECTRICAL CHARACTERISTICS (Continued)
bq29312A
SLUS629A – JANUARY 2005 – REVISED AUGUST 2005
T
A
= 25°C, C
(REG)
= 4.7 µF, BAT = 14 V (unless otherwise noted)
PARAMETER TEST CONDITION MIN NOM MAX UNIT
OVERLOAD (OL) AND SHORT-CIRCUIT (SC) DETECTION
V
OL
OL detection threshold range, typical
(1)
–50 –205 mV
∆ V
OL
OL detection threshold program step 5 mV
V
HYS(OL)
OL detection threshold hysteresis 7 10 13 mV
Charge 100 475
V
(SC)
SC detection threshold range, typical
(2)
mV
Discharge –100 –475
Charge 25
∆ V
(SC)
SC detection threshold program step mV
Discharge –25
V
HYS(SC)
SC detection threshold hysteresis Charge and Discharge 40 50 60 mV
V
OL
= 50 mV (min) 40 50 60
V
(OL_acr)
OL detection threshold accuracy
(1)
Discharge V
OL
= 100 mV 90 100 110 mV
V
OL
= 205 mV (max) 184 205 226
V
SC
= 100 mV (min) 80 100 120
V
(SC_acr)
SC detection threshold accuracy
(2)
Charge and Discharge V
SC
= 200 mV 180 200 220 mV
V
SC
= 475 mV (max) 426 475 523
FET DRIVE CIRCUIT
V
(FETOND)
= V
(BAT)
– V
(DSG)
VGS connect 1 M Ω BAT= 20 V 12 15 18
Output voltage, charge, and discharge
V
(FETON)
V
FETs on
V
(FETONC)
=V
(PACK)
– V
(CHG)
VGS connect 1 M Ω PACK = 20 V 12 15 18
V
(ZCHG)
ZVCHG clamp voltage PACK= 4.5 V 3.3 3.5 3.7 V
V
(FETOFF)
= V
(PACK)
– V
(DSG)
PACK= 16 V 0.2
Output voltage, charge and discharge
V
(FETOFF)
V
FETs off
V
(FETOFF
)=V
(BAT)
– V
(CHG)
BAT = 16 V 0.2
V
DSG
:10%–90% 40 200
t
r
Rise time C
L
= 4700 pF µs
V
CHG
:10%–90% 40 200
V
DSG
:90%–10% 40 200
t
f
Fall time C
L
= 4700 pF µs
V
CHG
:90%–10% 40 200
THERMISTOR DRIVE
I
O
= –1 mA at TOUT pin, rds
(ON)
= (V
REG
– V
O
(TOUT))/1 mA,
r
DS(on)
TOUT pass-element series resistance 50 100 Ω
T
A
= –25°C to 85°C
LOGIC
XALERT T
A
= –25°C to 85°C 60 100 200
R
(PUP)
Internal pullup resistance k Ω
SDATA, SCLK, T
A
= –25°C to 85°C 6 10 20
XALERT, I
O
= 200 µA, T
A
= –25°C to 85°C 0.2
V
OL
Logic level output voltage SDATA, I
O
= 50 µA, T
A
= –25°C to 85°C 0.4 V
OD I
O
=1 mA, T
A
= –25°C to 85°C 0.6
(1) See OL register for setting detection threshold
(2) See SC register for setting detection threshold
5