BQ24030_07 Datasheet, PDF (8/38 Pages) Texas Instruments – SINGLE-CHIP CHARGE AND SYSTEM POWER-PATH MANAGEMENT IC (bqTINY)

bq24030, bq24031, bq24032A
bq24035, bq24038
SLUS618F – AUGUST 2004 – REVISED NOVEMBER 2006
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
SWITCHING POWER SOURCE TIMING
t_SW-BAT
Switching power source from
inputs (AC or USB) to battery
t_SW-AC/USB
Switching from AC to USB, or,
USB to AC by input source
removal. ⁽¹⁸⁾
t_SW-PSEL
Switching from AC to USB, or
USB to AC by toggling PSEL
THERMAL SHUTDOWN REGULATION⁽¹⁹⁾
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
50
µs
100
50
100
T_(SHTDWN)
T_J(REG)
UVLO
Temperature trip
Thermal hysteresis
Temperature regulation limit
T_J (Q1 and Q3 only)
T_J (Q1 and Q3 only)
T_J (Q2)
155
30
°C
115
135
V_(UVLO)
Undervoltage lockout
Hysteresis
Decreasing V_CC
2.45
2.50
2.65
V
27
mV
(18) 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.
(19) 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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