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
≤
T
J
≤
125°C) and the recommended supply voltage range (unless otherwise noted)
PARAMETER
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,
R
TRM
= 50 K
Measure from:
I(AC) < 5 mA to I(USB) > 5 mA or I(USB)
< 5 mA
→
I(AC) > 5 mA;
I(OUT) = 100 mA, R
TMR
= 50 K,
ISET2 = hi, R
OUT
> 15
Ω,
V
DPPM
= 2.5 V
TEST CONDITIONS
MIN
TYP
MAX
UNIT
t
SW-BAT
Switching power source from in-
puts (AC or USB) to battery
50
t
SW-AC/USB
Switching from AC to USB, or,
USB to AC by input source re-
moval.
(20)
Switching from AC to USB, or
USB to AC by toggling PSEL,
bq24030/1/2/2A/5/8 only
µs
100
t
SW-PSEL
50
100
THERMAL SHUTDOWN REGULATION
(21)
T
(SHTDWN)
T
J(REG)
UVLO
V
(UVLO)
Undervoltage lockout
Hysteresis
Decreasing V
CC
2.45
2.50
27
2.65
V
mV
Temperature trip
Thermal hysteresis
Temperature regulation limit
T
J
(Q1 and Q3 only)
T
J
(Q1 and Q3 only)
T
J
(Q2)
115
155
30
135
°C
(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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