LTC4061 Datasheet, PDF (11/20 Pages) Linear Technology – Standalone Linear Li-lon Battery Charger with Thermistor Input

U
OPERATIO
V_CC
R_NOM
NTC
2
R_NTC
0.76 • V_CC
–
+
0.35 • V_CC
+
–
TOO COLD
TOO HOT
+
0.016 • V_CC
–
LTC4061
ENABLE
4061 F01
Figure 1. NTC Circuit Information
LTC4061
APPLICATIO S I FOR ATIO
Programming Charge Termination
The LTC4061 can terminate a charge cycle using one of
several methods, allowing the designer considerable flex-
ibility in choosing an ideal charge termination algorithm.
Table 1 shows a brief description of the different termina-
tion methods and their behaviors.
Charge Time Termination
Connecting a capacitor (C_TIMER) to the TIMER pin enables
the timer and selects charge time termination. The total
charge time is set by:
TIME (HOURS) = ^0.1µF • 3 HOURS
C _TIMER
Table 1.
METHOD
Charge
Time
Termination
Mode
Charge
Current
Termination
User
Selectable
Charge
Termination
TIMER
0.1µF to
GND
0.1µF to
GND
GND
GND
V_CC
V_CC
I_DET
R_DET to
GND
NC
R_DET to
GND
NC
R_DET to
GND
NC
CHARGER DESCRIPTION
Charges for 3 Hours. After 3 Hours, the Charger
Stops Charging and Enters Standby Mode.
Recharge Cycles Last for 1.5 Hours.
Charges for 3 Hours. After 3 Hours, the Charger
Stops Charging and Enters Standby Mode.
Recharge Cycles Last for 1.5 Hours.
Charges Until Charge Current Drops Below
I_DET, Then Enters Standby Mode.
Charges Indefinitely.
Charges Indefinitely.
SmartStart Is Disabled.
Charges Indefinitely.
SmartStart Is Disabled.
CHRG OUTPUT DESCRIPTION
Pull-Down State While I_BAT > I_DET. High Impedance
State While I_BAT < I_DETECT or When Charging Is Stopped.
Pulsing State Available When NTC Is Used and
Is Still Charging.
Pull-Down State When Charging. High Impedance State
When Charging Is Stopped. Pulsing State Available
When NTC Is Used and Is Still Charging.
Pull-Down State When Charging. High Impedance State
When Charging Is Stopped. Pulsing State Available
When NTC Is Used and Is Still Charging.
Pull-Down State When Charging. High Impedance State
When Charging Is Stopped. Pulsing State Available
When NTC Is Used and Is Still Charging.
Pull-Down State While I_BAT > I_DETECT. High Impedance
State While I_BAT < I_DETECT or When Charging Is Stopped.
Pulsing State Available When NTC Is Used and
Is Still Charging.
Pull-Down State When Charging. High Impedance State
When Charging Is Stopped. Pulsing State Available
When NTC Is Used and Is Still Charging.
4061fa
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