BQ24200DGNG4 Datasheet, PDF (12/20 Pages) Texas Instruments – SINGLE-CHIP LI-ION AND LI-POL CHARGE MANAGEMENT IC FOR CURRENT-LIMITED APPLICATIONS

bq24200, bq24201
bq24202, bq24203
bq24204, bq24205
SLUS501C – OCTOBER 2001 – REVISED MARCH 2008
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After a charge termination, the bq2420x restarts the charge once the voltage on the BAT pin falls below the
V_(RCH) threshold. This feature keeps the battery at full capacity at all times.
SLEEP MODE
The bq2420x enters the low-power sleep mode if the Vcc is removed from the circuit (i.e., the Vcc and IN pins
are floating). For applications where these pins are not floating, placing a low-power 10 Ω (1/16 W) between the
IN and VCC pins ensures the V_(SLP) conditions are met (see Figure 9).This feature prevents draining the battery
during the absence of V_CC.
Figure 9. Sleep Mode
CHARGE ENABLE PIN
The CE pin on bq24202, bq24203, bq24204 and bq24205 can be used to enable or suspend the charge. Charge
is enabled if the voltage V_IL(CE) is applied to the pin. Applying the V_IH(CE) suspends the charge. During a charge
suspend mode, the internal powerFET is turned off and all timers are reset.
CHARGE STATUS OUTPUT
The STAT pin on the bq2420x, indicates various conditions of operation. These conditions are summarized in
Table 1.
Table 1. STAT Pin
CONDITION
Pre-charge
Fast-charge
Charge-complete
Taper timer done
Charge suspend (due to temperature or CE input)
Thermal shutdown
Pre-charge timer fault
Sleep mode
Charge timer fault
STAT
High
High
Low
Low
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
12
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