LTC4061(RevA) Ver la hoja de datos (PDF) - Linear Technology
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LTC4061 Datasheet PDF : 20 Pages
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U
OPERATIO
VCC
RNOM
NTC
2
RNTC
0.76 • VCC
–
+
0.35 • VCC
+
–
TOO COLD
TOO HOT
+
0.016 • VCC
–
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 (CTIMER) 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
VCC
VCC
IDET
RDET to
GND
NC
RDET to
GND
NC
RDET 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
IDET, Then Enters Standby Mode.
Charges Indefinitely.
Charges Indefinitely.
SmartStart Is Disabled.
Charges Indefinitely.
SmartStart Is Disabled.
CHRG OUTPUT DESCRIPTION
Pull-Down State While IBAT > IDET. High Impedance
State While IBAT < IDETECT 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 IBAT > IDETECT. High Impedance
State While IBAT < IDETECT 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
11
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