Datasheet

bq24030, bq24031
bq24032A, bq24035, bq24038
SLUS618H –AUGUST 2004–REVISED OCTOBER 2009............................................................................................................................................... www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
over junction temperature range (0°C ≤ T
J
≤ 125°C) and the recommended supply voltage range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
START-UP CONTROL and USB BOOT-UP
On the first application of USB input power or AC input
t
(BOOT-UP)
Boot-up time 120 150 180 ms
with PSEL Low
SWITCHING POWER SOURCE TIMING
Only AC power or USB power applied. Measure from:
Switching power source from inputs
t
SW-BAT
[xxPG: Lo → Hi to I(xx) > 5 mA], 50
(AC or USB) to battery
xx = AC or USB I(OUT) = 100 mA, R
TRM
= 50 K
Switching from AC to USB, or, USB Measure from:
μs
t
SW-AC/USB
100
to AC by input source removal.
(19)
I(AC) < 5 mA to I(USB) > 5 mA or I(USB)
< 5 mA → I(AC) > 5 mA;
Switching from AC to USB, or USB
I(OUT) = 100 mA, R
TMR
= 50 K,
t
SW-PSEL
50 100
to AC by toggling PSEL
ISET2 = hi, R
OUT
> 15 Ω, V
DPPM
= 2.5 V
THERMAL SHUTDOWN REGULATION
(20)
T
(SHTDWN)
Temperature trip T
J
(Q1 and Q3 only) 155
Thermal hysteresis T
J
(Q1 and Q3 only) 30 °C
T
J(REG)
Temperature regulation limit T
J
(Q2) 115 135
UVLO
V
(UVLO)
Undervoltage lockout Decreasing V
CC
2.45 2.50 2.65 V
Hysteresis 27 mV
(19) 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.
(20) 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.
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Product Folder Link(s): bq24030, bq24031 bq24032A, bq24035, bq24038