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參數(shù)資料
| 型號： | LTC1732-8.4 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Lithium-Ion Linear Battery Charger Controller |
| 中文描述： | 鋰離子線性電池充電控制器 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 191K |
| 代理商： | LTC1732-8.4 |
12
LTC4054L-4.2
4054l42f
APPLICATIOU
Example: An LTC4054L operating from a 6V wall adapter
is programmed to supply 150mA full-scale current to a
discharged Li-Ion battery with a voltage of 3.75V. Assum-
ing
θ
JA
is 200
°
C/W, the ambient temperature at which the
LTC4054L will begin to reduce the charge current is
approximately:
T
A
= 120
°
C – (6V – 3.75V) (150mA) 200
°
C/W
T
A
= 120
°
C – 0.3375W 200
°
C/W = 120
°
C – 67.5
°
C
T
A
= 52.5
°
C
The LTC4054L can be used above 52.5
°
C, but the charge
current will be reduced from 150mA. The approximate
current at a given ambient temperature can be approxi-
mated by:
W
U
U
I
C–
V
BAT
V
BAT
A
θ
CC
JA
=
°
(
)
120
–
Using the previous example with an ambient tempera-
ture of 60
°
C, the charge current will be reduced to
approximately:
I
C
V
C
V
C W
°
/
C
C A
°
I
mA
BAT
BAT
=
°
°
(
133
)
=
°
=
120
–3 75
60
200
6
60
450
–
/
Moreover, when thermal feedback reduces the charge
current, the voltage at the PROG pin is also reduced
proportionally as discussed in the Operation section.
It is important to remember that LTC4054L applications
do not need to be designed for worst-case thermal condi-
tions since the IC will automatically reduce power dissipa-
tion when the junction temperature reaches approximately
120
°
C.
Thermal Considerations
Because of the small size of the ThinSOT package, it is very
important to use a good thermal PC board layout to
maximize the available charge current. The thermal path
for the heat generated by the IC is from the die to the
copper lead frame, through the package leads, (especially
the ground lead) to the PC board copper. The PC board
copper is the heat sink. The footprint copper pads should
be as wide as possible and expand out to larger copper
areas to spread and dissipate the heat to the surrounding
ambient. Feedthrough vias to inner or backside copper
layers are also useful in improving the overall thermal
performance of the charger. Other heat sources on the
board, not related to the charger, must also be considered
when designing a PC board layout because they will affect
overall temperature rise and the maximum charge current.
The following table lists thermal resistance for several
different board sizes and copper areas. All measurements
were taken in still air on 3/32" FR-4 board with the device
mounted on topside.
Table 1. Measured Thermal Resistance (2-Layer Board*)
COPPER AREA
TOPSIDE
BACKSIDE
2500mm
2
2500mm
2
2500mm
2
1000mm
2
2500mm
2
2500mm
2
225mm
2
2500mm
2
2500mm
2
100mm
2
2500mm
2
2500mm
2
50mm
2
2500mm
2
2500mm
2
*Each layer uses one ounce copper
BOARD
AREA
THERMAL RESISTANCE
JUNCTION-TO-AMBIENT
125
°
C/W
125
°
C/W
130
°
C/W
135
°
C/W
150
°
C/W
Table 2. Measured Thermal Resistance (4-Layer Board**)
COPPER AREA
BOARD
(EACH SIDE)
2500mm
2***
2500mm
2
**Top and bottom layers use two ounce copper, inner layers use one
ounce copper.
***10,000mm
2
total copper area
THERMAL RESISTANCE
JUNCTION-TO-AMBIENT
80
°
C/W
AREA
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