BQ2005STR datasheet(4/22 Pages) TI2

4 / 22 page

The valid battery voltage range is VEDV <VBAT <VMCV.

The valid temperature range is VHTF <VTEMP <VLTF,

where:

VLTF = 0.4

∗ VCC ± 30mV

VHTF = [(1/4

∗ VLTF) + (3/4 ∗ VTCO)] ± 30mV

VTCO is the voltage presented at the TCO input pin, and is

configured by the user with a resistor divider between VCC

and ground. The allowed range is 0.2 to 0.4

∗ VCC.

If the temperature of the battery is out of range, or the

voltage is too low, the chip enters the charge pending

state and waits for both conditions to fall within their al-

lowed limits. The MODA,B output is modulated to pro-

vide the configured trickle charge rate in the charge

pending state.

There is no time limit on the charge

pending state; the charger remains in this state as long

as the voltage or temperature conditions are outside of

the allowed limits. If the voltage is too high, the chip

goes to the battery absent state and waits until a new

charge cycle is started.

Fast charge continues until termination by one or more

of the five possible termination conditions:

Delta temperature/delta time (

∆T/∆t)

Negative delta voltage (-

∆ V)

Maximum voltage

Maximum temperature

Maximum time

bq2005

Fast Charging

Top-Off

(Optional)

T200501.eps

Dis-

charge

(Optional

Battery A)

Charge

Pending*

(Pulse-Trickle)

DISA

MODA,B

Discharge-Before-Charge started

Battery discharged to 0.475 * VCC. Battery outside

temperature/voltage limits.

Battery within temperature/voltage limits.

Pulse-Trickle

Switch-mode

Configuration

External

Regulation

CHA,B Status Output

FCCA,B Status Output

34s

260 s

Note*

260 s

Note*

*See Table 3 for pulse-trickle period.

Figure 2. Charge Cycle Phases

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