Datasheet

V
BAT
V
OUT
bq24030, bq24031
bq24032A, bq24035, bq24038
SLUS618H –AUGUST 2004–REVISED OCTOBER 2009............................................................................................................................................... www.ti.com
Figure 12 illustrates when a battery is inserted for power up; channel 1 (CH1) VAC = 0 V; channel 2 (CH2) V
USB
= 0 V; channel 3 (CH3) V
OUT
; output current, I
OUT
= 0.25 A for V
OUT
> 2 V; channel 4 (CH4) V
BAT
= 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.
Figure 12. Insert Battery – 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; 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 bqTINY III-series implements the CE and
ISET2 pins as programmed.
20 Submit Documentation Feedback Copyright © 2004–2009, Texas Instruments Incorporated
Product Folder Link(s): bq24030, bq24031 bq24032A, bq24035, bq24038