BQ2004E Datasheet, PDF (8/16 Pages) Texas Instruments – Fast-Charge ICs

bq2004E/H
New Charge Cycle Started by
Any One of:
VCC Rising to Valid Level
Battery Replacement
(VCELL Falling through VMCV)
Inhibit (INH) Released
DCMD Tied to Ground?
No
VEDV < VCELL < VMCV
Battery Voltage?
Falling Edge
on DCMD
Yes
VCELL< VEDV Discharge-
Before-Charge
Battery Temperature?
Charge
Pending
VCELL < VEDV
VTEMP > VLTF or
VTEMP < VHTF
VCELL >
Top-Off and
Pulse-Trickle
VMCV
Charge
VCELL > VMCV
VHTF < VTEMP < VLTF
Fast
Charge
VCELL > VMCV
VEDV < VCELL < VMCV
and
VHTF < VTEMP < VLTF
Pulse
Trickle
Charge
VCELL > VMCV
t > t_MCV
Battery
Absent
Pulse
Trickle
Charge
- V or
T/ t or
VTEMP < VTCO
or
Maximum Time Out
Top-Off
Selected?
Yes
No
VCELL >
VMCV
Top-Off
Charge
VCELL <
VMCV
VCELL >
VMCV
Charge
Complete
VTEMP < VTCO
or 0.235 Maximum
Time Out
Pulse
Trickle
Charge
SD2004EH.eps
Figure 3. Charge Algorithm State Diagram
8