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LTC4057ES5-4.2 Datasheet(PDF) 9 Page - Linear Technology

Part # LTC4057ES5-4.2
Description  Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4057ES5-4.2 Datasheet(HTML) 9 Page - Linear Technology

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LTC4057-4.2
9
4057f
Figure 2. A Circuit to Maximize Thermal Mode Charge Current
VCC
RPROG
RCC
Li-Ion
CELL
405742 F02
LTC4057-4.2
1
µF
VS
BAT
PROG
GND
+
4
3
5
2
Solving for IBAT using the quadratic formula1.
I
VV
VV
RC
T
R
BAT
S
BAT
S
BAT
CC
A
JA
CC
=
°


(–
) –
(–
)
(–
)
2 4
120
2
θ
Using RCC = 0.25Ω, VS = 5V, VBAT = 3.75V, TA = 25°C and
θJA = 125°C/W, we can calculate the thermally
regulated charge current to be:
IBAT = 708.4mA
Note 1: Large values of RCC will result in no solution for IBAT. This indicates that the LTC4057 will
not generate enough heat to require thermal regulation.
While this application delivers more energy to the battery
and reduces charge time in thermal mode, it may actually
lengthen charge time in voltage mode if VCC becomes low
enough to put the LTC4057 into dropout. Figure 3 shows
how this circuit can result in dropout as RCC becomes
large.
This technique works best when RCC values are minimized
to keep component size small and avoid dropout. Remem-
ber to choose a resistor with adequate power handling
capability.
RCC (Ω)
0
1000
800
600
400
200
0
0.5
1.0
1.25
405442 F03
0.25
0.75
1.5
1.75
CONSTANT
CURRENT
VBAT = 3.75V
TA = 25°C
θJA = 125°C/W
RPROG = 1.25kΩ
THERMAL
MODE
DROPOUT
VS = 5.25V
VS = 5.5V
VS = 5V
Figure 3. Charge Current vs RCC
APPLICATIO S I FOR ATIO


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