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| BQ24070RHLRG4 Datasheet, PDF (15/31 Pages) Texas Instruments – SINGLE-CHIP LI-ION CHARGE AND SYSTEM POWER-PATH MANAGEMENT IC | |||
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www.ti.com
bq24070
bq24071
SLUS694F â MARCH 2006 â REVISED DECEMBER 2009
Break Before Make
System Capacitance
Powering System
DPPM Mode
USB is Charging System Capacitance
VAC
VUSB
VOUT
VBAT
Hi
PSEL
Low
Figure 7. Toggle Mode Low
Figure 8 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; 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 has to 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 8. Insert Battery â Power-Up Output via BAT
Figure 9 illustrates USB boot up and power-up via USB; channel 1 (CH1) V(USH) = 0 to 5 V; channel 2 (CH2) USB
Copyright © 2006â2009, Texas Instruments Incorporated
Product Folder Link(s): bq24070 bq24071
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