BQ24070 Datasheet, PDF (16/26 Pages) Texas Instruments – SINGLE-CHIP CHARGE AND SYSTEM POWER-PATH MANAGEMENT IC

bq24070
SLUS694A – MARCH 2006 – REVISED MARCH 2006
FUNCTIONAL DESCRIPTIONS (continued)
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V_BAT
V_OUT
Figure 7. Insert Battery – Power-Up Output via BAT
Figure 8 illustrates USB boot up and power-up via USB; channel 1 (CH1) V_(USH) = 0 to 5 V; channel 2 (CH2)
USB input current (0.2 A/div); Mode = Low; CE = High; ISET2 = High; V_BAT = 3.85 V; V_(DPPM) = 3.0 V (V_(DPPM) ×
1.15 < V_BAT, otherwise DPPM mode increases time duration). When a USB source is applied (if AC is not
present), the CE pin and ISET2 pin are ignored during the boot-up time and a maximum input current of 100 mA
is made available to the OUT or BAT pins. After the boot-up time, the IC implements the CE and ISET2 pins as
programmed.
V_AC
I_USB
Figure 8. USB Boot-Up Power-Up
Battery Temperature Monitoring
The bq24070 continuously monitors battery temperature by measuring the voltage between the TS and VSS
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