RICOH RV5VG1 Series Rechargeable Lithium-Ion Cell Protectors

查询RV5VG101C供应商

RECHARGEABLE LITHIUM-ION CELL PROTECTORS

EK-080-9803

RV5VG1×××SERIES

OUTLINE The RV5VG×××series Li-ion cell protectors are circuits designed for detecting overcharging and excessive dis- charging of rechargeable single-cell lithium-ion batteries (based on the CMOS process). Besides detecting over- charging or excessive discharging of single cell Li-ion battery, the RV5VG1×××series Li-ion cell protectors include a short-circuit protector to prevent excessive current due to an external short-circuit. Each of these protectors comprise two voltage detectors, a hysteresis circuit, a reference voltage source, a logic circuit, a short-circuit protector and a charger connection detection-circuit. Of the two voltage detectors, VD1 detects overcharging (rising edge of waveform) while VD2 detects excessive discharging (falling edge of waveform). Voltage output switches to a low (“L”) state if either a rising or falling voltage level is detected. When a short pro-

tection circuit is activated while DOUT output is at “H” level, DOUT output switches to “L” level after internally set

delay time, which, in turn, switches to “H” level when short is cleared. Required current after detection of over- discharge is suppressed to minimum by stopping the internal circuit. Using an external capacitor, the output delay time of the voltage detector for excessive discharge/overcharge can be set. The series employ CMOS output type.

FEATURES

...................................................................TYP. 2.3µA (for normal operations)

Low Supply Current High Accuracy Detector Threshold............................................over-charge ±50m V

over-discharge ±2.5%

Variety of Detector Threshold...................................................over-charge 4.0 to 4.5 V(0.05V step)

over-discharge 2.0 to 3.0V(0.05V step)

Built-in Protection Circuit Short protection voltage may be set insteps 0.05V within the range of 0.1V to 0.4V (accuracy±15%) Adustable sensing delay for overcharging ................................delay of 43ms when external 1000p F is installed

(VDD=4.3V)

Adjustable sensing delay for excessive discharging.................delay of 24ms when external 1000p F is installed

(VDD=2.4V)

Output Type ................................................................................CMOS Small Package ............................................................................8pin SSOP

APPLICATIONS • Li-ion single cell protectors for power pack. • High precision protectors for cellular phones, camcorders and any other gadgets using Li-ion cell.