Datasheet

bq24278
www.ti.com SLUSB04 –JUNE 2012
ELECTRICAL CHARACTERISTICS (continued)
Circuit of Figure 2, VU
VLO
< V
IN
< V
OVP
AND V
IN
>V
BAT
+V
SLP
, T
J
= 0°C–125°C and T
J
= 25°C for typical values (unless
otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
PWM CONVERTER
Internal top reverse blocking MOSFET on-resistance I
IN_LIMIT
= 500 mA, Measured from V
IN
to PMIDU 95 175 mΩ
Internal top N-channel Switching MOSFET on-resistance Measured from PMIDU to SW 100 175 mΩ
Internal bottom N-channel MOSFET on-resistance Measured from SW to PGND 65 115 mΩ
f
OSC
Oscillator frequency 1.35 1.50 1.65 MHz
D
MAX
Maximum duty cycle 95%
D
MIN
Minimum duty cycle 0
BATTERY-PACK NTC MONITOR
V
HOT
High temperature threshold V
TS
falling 29.7 30 30.5
V
HYS(HOT)
Hysteresis on high threshold V
TS
rising 1
V
COLD
Low temperature threshold V
TS
rising 59.5 60 60.4
V
WARM
Warm temperature threshold V
TS
falling 37.9 38.3 39.6
V
HYS(WARM)
Hysteresis on warm threshold V
TS
rising 1 %VDRV
V
COOL
Cool temperature threshold V
TS
rising 56.0 56.5 56.9
V
HYS(COOL)
Hysteresis on cool threshold V
TS
falling 1
V
HYS(COLD)
Hysteresis on low threshold V
TS
falling 1
TSOFF TS Disable threshold V
TS
rising, 2% V
DRV
Hysteresis 70 73
t
DGL(TS)
Deglitch time on TS change 50 ms
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