Datasheet Texas Instruments BQ29405

Not Recommended for New Designs:
bq29400, bq29400A, bq29405 bq29400, bq29400A
bq29401, bq29405
www.ti.com SLUS568C – JULY 2003 – REVISED SEPTEMBER 2005 VOLTAGE PROTECTION FOR 2-, 3-, OR 4-CELL Lion BATTERIES
(2nd PROTECTION)
FEATURES FUNCTION 2-, 3-, or 4-Cell Secondary Protection
Low Power Consumption ICC < 2 ВµA
[VCELL(ALL) < V(PROTECT)]
High Accuracy Over Sense Voltage:
– bq29400: 4.35 V ±25 mV
– bq29400A: 4.40 V ±25 mV
– bq29401: 4.45 V ±25 mV
– bq29405: 4.65 V ±25 mV
Prefixed Protection Threshold Voltage
Programmable Delay Time
High Power Supply Ripple Rejection
Stable During Pulse Charge Operation Each cell in a multiple cell pack is compared to an
internal reference voltage. If one cell reaches an
overvoltage condition, the protection sequence
begins. The bq2940x device starts charging an
external capacitor through the CD pin. When the CD
pin voltage reaches 1.2 V, the OUT pin changes from
a low level to a high level. …