LTC4063 LINER [Linear Technology], LTC4063 Datasheet - Page 11

• Manufacturer Part Number: LTC4063
• Description: Standalone Linear Li-Ion Charger with Micropower Low Dropout Linear Regulator
• Manufacturer: LINER [Linear Technology]

APPLICATIO S I FOR ATIO
OPERATIO
Figure 1 shows how an external resistor divider sets the
regulator output voltage. The output voltage can be set
Programming Charge Termination
The LTC4063 terminates a charge cycle using several
methods, allowing the designer considerable flexibility in
choosing an ideal charge termination algorithm. Table 1
shows a brief description of the different termination
methods and their behavior.
Charge Time Termination
Connecting a capacitor (C
the timer and selects Charge Time Termination. The total
charge time is set by:
Table 1
METHOD
Charge Time
Termination
Charge Current
Termination
User-Selectable
Charge
Termination
Time Hours
Li-Ion BATTERY
SINGLE CELL
(
Figure 1. Adjustable Linear Regulator
0.1µF to
0.1µF to
TIMER
)
+
GND
GND
GND
GND
V
V
=
CC
CC
U
U
C
0 1
TIMER
.
BAT
µ
R
R
R
LTC4063
DET
GND
DET
GND
F
DET
GND
I
NC
NC
NC
GND
U
DET
TIMER
•
to
to
to
3
OUT
FB
Hours
) to the TIMER pin enables
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
Charges Indefinitely Until CHGEN Pin is Pulled
High
Charges Indefinitely Until CHGEN Pin is Pulled
High. SmartStart is Disabled
Charges Indefinitely Until CHGEN Pin is Pulled
High. SmartStart is Disabled
DETECT
W
R2
R1
, Then Enters Standby Mode
4063 F01
C
V
OUT
OUT
U
anywhere between 1.2V and 4.2V, although the upper limit
is limited by the battery voltage minus the regulator
dropout voltage.
In order to maintain stability under light load conditions,
the maximum recommended value of R1 is 160k.
When the programmed time has elapsed, the charge cycle
terminates and the charger enters standby mode. Subse-
quent recharge cycles terminate when half the programmed
time has elapsed.
The IDET pin determines the behavior of the CHRG output.
Connecting a resistor (R
sets the charge current detection threshold, I
or
I
R
V
DETECT
OUT
DET
=
=
CHRG OUTPUT DESCRIPTION
Pull-Down State While I
State While I
Pull-Down State When Charging. High Impedance State
When Charging is Stopped
Pull-Down State When Charging. High Impedance State
When Charging is Stopped
Pull-Down State When Charging. High Impedance State
When Charging is Stopped
Pull-Down State While I
State While I
Pull-Down State When Charging. High Impedance State
When Charging is Stopped
I
800
=
DETECT
100
10
R
mV
PROG
R
V
DET
•
⎛
⎜
⎝
BAT
BAT
1
•
+
I
CHG
< I
< I
DET
R
R
DETECT
DETECT
2
1
) from the IDET pin to ground
⎞
⎟
⎠
=
BAT
BAT
100
R
DET
or When Charging is Stopped
or When Charging is Stopped
> I
> I
V
DETECT
DETECT
. High Impedance
. High Impedance
LTC4063
DETECT
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