bq2007

Features:

Fast charging and conditioning of NiCdandNiMHbatteries
   - Precise charging independent of battery pack number of cells
   - Discharge-before-charge on demand
   - Pulse trickle charge conditioning
   - Battery undervoltage and overvoltage protection
Built-in 10-step voltage-based chargestatusmonitoring
   - Charge status display options include seven-segment monotonic bargraph and fully decoded BCD digit
   - Display interface options for direct drive of LCD or LED segments
   - Charger state status indicators for pending, discharge,charge,completion, and fault
   - Audible alarm for charge completion and fault conditions
Chargecontrolflexibility
   - Fast or Standard speed charging
   - Top-off mode for NiMH
   - Charge rates from to _^c/8 2C(30 minutes to 8 hours)
Chargeterminationby:
   - Negative delta voltage (-?V)
   - Peak voltage detect (PVD)
   - Maximum voltage
   - Maximum time
   - Maximum temperature
High-efficiency switch-mode design
   -Ideal for small heat-sensitive enclosures
24-pin,300-milSOICorDIP


Pinout




Specifications

Symbol	Parameter	Minimum	Maximum	Unit	Notes
VCC	VCC relative to VSS	-0.3	+7.0	V
VT	DC voltage applied on any pin ex- cluding VCC relative to VSS	-0.3	+7.0	V
TOPR	Operating ambient temperature	-20	+70	°C	Commercial
TSTG	Storage temperature	-40	+85	°C
TSOLDER	Soldering temperature	-	+260	°C

Description

The bq2007 is a highly integrated monolithic CMOS IC designed to provide intelligent battery charging and charge status monitoring for stand-alonechargesystems.


The bq2007 provides a wide variety of charge status display formats. The bq2007 internal charge status monitor supports up to a seven-segment bargraph or a single BCD digit display. The bargraph display indicates up to seven monotonic steps, whereas the BCD digit counts in ten steps of 10% increments. The bq2007 output drivers can direct-drive either an LCDorLEDdisplay.


Charge action of bq2005 begins either by application of the charging supply or by replacement of the battery pack. For safety, charging is inhibited until battery temperature and voltage are withinconfiguredlimits.