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| BQ24030-Q1 Datasheet, PDF (18/34 Pages) Texas Instruments – SINGLE-CHIP CHARGE AND SYSTEM POWER-PATH MANAGEMENT IC | |||
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bq24030-Q1
bq24031-Q1
SLUS793B â APRIL 2008 â REVISED OCTOBER 2009.................................................................................................................................................... www.ti.com
Figure 11 illustrates when the battery is absent, power transfers to USB [PSEL = H, channel 1 (CH1)
VAC = 5.4 V, channel 2 (CH2) V(USB) = 5 V, channel 3 (CH3) VOUT, output current IOUT = 0.25 A, channel 4 (CH4)
VBAT, I(PGM-CHG) = 1 A]. Note the saw-tooth waveform due to cycling between charge done and refresh (new
charge).
VAC
VUSB
VOUT
VBAT
BAT PIN Capacitance Discharging to Refresh Threshold
Charging (Step) Followed by Charge Done
Figure 11. Battery Absent â Power Transfer to USB
Figure 12 illustrates when a battery is inserted for power up [channel 1 (CH1) VAC = 0 V, channel 2 (CH2)
VUSB = 0 V, channel 3 (CH3) VOUT, output current IOUT = 0.25 A for VOUT > 2 V, channel 4 (CH4) VBAT = 3.5 V,
and C(DPPM) = 0 pF]. When there are no power sources and the battery is inserted, the output tracks the battery
voltage if there is no load (<10 mA of load) on the output, as shown. If a load is present that keeps the output
more than 200 mV below the battery, a short-circuit condition is declared. At this time, the load must be removed
to recover. A capacitor can be placed on the DPPM pin to delay implementing the short-circuit mode and get
unrestricted (not limited) current.
VBAT
VOUT
Figure 12. Insert Battery â Power-Up Output via BAT
18
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Product Folder Link(s): bq24030-Q1 bq24031-Q1
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