BQ24030_07 Datasheet, PDF(20/38 Page) Texas Instruments – SINGLE-CHIP CHARGE AND SYSTEM POWER-PATH MANAGEMENT IC (bqTINY)

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BQ24030_07 Datasheet, PDF (20/38 Pages) Texas Instruments – SINGLE-CHIP CHARGE AND SYSTEM POWER-PATH MANAGEMENT IC (bqTINY)

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bq24030, bq24031, bq24032A

bq24035, bq24038

SLUS618F â AUGUST 2004 â REVISED NOVEMBER 2006

www.ti.com

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; 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 12. Insert Battery â Power-Up Output via BAT

Figure 13 illustrates USB bootup and power-up via USB; channel 1 (CH1) V(USH) = 0 to 5 V; channel 2 (CH2)

USB input current (0.2 A/div); PSEL = Low; CE = High; ISET2 = High; VBAT = 3.85 V; V(DPPM) = 3.0 V (V(DPPM) Ã

1.15 < VBAT, 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 bqTINY III-series implements the CE and

ISET2 pins as programmed.

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