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| LTC4015_15 Datasheet, PDF (28/76 Pages) Linear Technology – Multichemistry Buck Battery Charger Controller with Digital Telemetry System | |||
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LTC4015
Operation
CHARGER_
SUSPENDED*
BATTERY
DETECTION
NO BATTERY
BATTERY
VOLTAGE
STABLE
SHORTED
BATTERY
MAX_CHARGE_TIMER STARTS
BAT_MISSING_
FAULT
BAT_SHORT_
FAULT
30 SECOND
TIME OUT
BATTERY VOLTAGE
> 2.85V/CELL
VBAT < 35%
OF VCHARGE
MAX_CHARGE_TIME
PASSED
MAX_CHARGE_TIME_FAULT
CC_CV_CHARGE
BATTERY VOLTAGE
> 2.9 V/CELL
NTC_RATIO
BELOW JEITA_T7
OR ABOVE JEITA_T1
BATTERY VOLTAGE
< 2.85 VCELL
PRECHARGE
NTC_RATIO
BELOW JEITA_T7
OR ABOVE JEITA_T1
BATTERY AT VCHARGE (CV)
âANDâ
ICHG < C_OVER_X_THRESHOLD
âANDâ
EN_C_OVER_X_TERM = 1
TO NTC
PAUSE
MAX_CV_TIME PASSED
WITH BATTERY AT
VCHARGE (CV)
TO NTC
PAUSE
RECHARGE THRESHOLD
REACHED
RECHARGE THRESHOLD
REACHED
C_OVER_X_TERM
TIMER_TERM
* NOTE: ALL STATES RETURN TO CHARGER SUSPENDED IF ANY OF THE FOLLOWING OCCUR:
A. THE INPUT VOLTAGE VIN FALLS TO WITHIN 100mV OF THE BATSENS PIN VOLTAGE.
B. SUSPEND_CHARGER IS WRITTEN TO 1 VIA THE SERIAL PORT.
C. A SYSTEM FAULT OCCURS (VIN OVERVOLTAGE LOCKOUT, 2P5VCC UNDERVOLTAGE LOCKOUT, INTVCC
UNDERVOLTAGE LOCKOUT, DRVCC UNDERVOLTAGE LOCKOUT. THERMAL SHUTDOWN, MISSING RT
RESISTOR, OR INVALID COMBINATION OF CELLS PINS).
RETURN TO PREVIOUS
CHARGE STATE
NTC_RATIO
BETWEEN JEITA_T7
AND JEITA_T1
NTC_PAUSE
NTC_RATIO
OUT OF RANGE
TO BAT_MISSING_
FAULT
4015 F05a
Figure 5A. Li-Ion Battery Charging State Diagram
4015f
28
For more information www.linear.com/LTC4015
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