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LTC4061 Datasheet(PDF) 11 Page - Linear Technology

Part # LTC4061
Description  Standalone Linear Li-lon Battery Charger with Thermistor Input
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4061 Datasheet(HTML) 11 Page - Linear Technology

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LTC4061
11
4061fc
APPLICATIO S I FOR ATIO
+
+
+
0.35 • VCC
0.76 • VCC
0.016 • VCC
TOO COLD
TOO HOT
ENABLE
RNTC
RNOM
2
LTC4061
VCC
4061 F01
NTC
OPERATIO
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.
Figure 1. NTC Circuit Information
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
F
C
HOURS
TIMER
(
)
.
=
µ
0 1
3
APPLICATIO S I FOR ATIO
Table 1.
METHOD
Charge
Time
Termination
Mode
Charge
Current
Termination
TIMER
0.1µF to
GND
IDET
RDET to
GND
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.
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.
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 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.
0.1µF to
GND
GND
RDET to
GND
User
Selectable
Charge
Termination
VCC
RDET to
GND
Charges Indefinitely.
Charges Indefinitely.
SmartStart Is Disabled.
VCC
NC
Charges Indefinitely.
SmartStart Is Disabled.
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.
GND
NC
NC


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