bq24030, bq24031, bq24032,
bq24032A, bq24035, bq24038, bq24039
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SLUS618C–AUGUST 2004–REVISED JUNE 2005
ELECTRICAL CHARACTERISTICS (continued)
over junction temperature range (0°C ≤ TJ ≤ 125°C) and the recommended supply voltage range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
SWITCHING POWER SOURCE TIMING
Only AC power or USB power applied.
Measure from:
[xxPG: Lo → Hi to I(xx) > 5 mA],
xx = AC or USB I(OUT) = 100 mA,
RTRM = 50 K
Switching power source from in-
puts (AC or USB) to battery
tSW-BAT
50
Switching from AC to USB, or,
USB to AC by input source re-
moval.
µs
Measure from:
I(AC) < 5 mA to I(USB) > 5 mA or I(USB)
< 5 mA → I(AC) > 5 mA;
I(OUT) = 100 mA, RTMR = 50 K,
ISET2 = hi, ROUT > 15 Ω, VDPPM = 2.5 V
tSW-AC/USB
100
100
(20)
Switching from AC to USB, or
USB to AC by toggling PSEL,
bq24030/1/2/2A/5/8 only
tSW-PSEL
50
THERMAL SHUTDOWN REGULATION(21)
T(SHTDWN)
Temperature trip
TJ (Q1 and Q3 only)
TJ (Q1 and Q3 only)
TJ (Q2)
155
30
Thermal hysteresis
°C
TJ(REG)
UVLO
V(UVLO)
Temperature regulation limit
115
135
Undervoltage lockout
Hysteresis
Decreasing VCC
2.45
2.50
27
2.65
V
mV
(20) The power handoff is implemented once the PG pin goes high (removed sources PG) which is when the removed source drops to the
battery voltage. if the battery voltage is critically low, the system may lose power unless the system takes control of the PSEL pin and
switches to the available power source prior to shutdown. The USB source often has less current available; so, the system may have to
reduce its load when switching from AC to USB (bq24030/1/2/2A/5/8).
(21) Reaching thermal regulation reduces the charging current. Battery supplement current is not restricted by either thermal regulation or
shutdown. Input power FETs turn off during thermal shutdown. The battery FET is only protected by a short-circuit limit which typically
does not cause a thermal shutdown (input FETs turning off) by itself.
8
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