参数资料
| 型号： | LTC4095EDC#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER LI-ION/POLY 8-DFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4.35 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN（2x2） |
| 包装： | 带卷 (TR) |
LTC4095
APPLICATIONS INFORMATION
Solving these equations for R NTC|COLD and R NTC|HOT
results in the following:
For example, to set the trip points to 0°C and 45°C with
a Vishay Curve 1 thermistor choose:
R NTC|HOT = 0.536 ? R NOM
and
R NOM =
3.266 – 0.4368
2 . 714
? 100 k = 104 . 2 k
R NTC|COLD = 3.25 ? R NOM
By setting R NOM equal to R25, the above equations result
in r HOT = 0.536 and r COLD = 3.25. Referencing these ratios
to the Vishay Resistance-Temperature Curve 1 chart gives
a hot trip point of about 40°C and a cold trip point of about
0°C. The difference between the hot and cold trip points
is approximately 40°C.
By using a bias resistor, R NOM , different in value from
R25, the hot and cold trip points can be moved in either
direction. The temperature span will change somewhat due
to the nonlinear behavior of the thermistor. The following
equations can be used to easily calculate a new value for
the bias resistor:
the nearest 1% value is 105k.
R1 = 0.536 ? 105k – 0.4368 ? 100k = 12.6k
the nearest 1% value is 12.7k. The ?nal solution is shown
in Figure 4 and results in an upper trip point of 45°C and
a lower trip point of 0°C.
USB and Wall Adapter Power
Although the LTC4095 is designed to draw power from a
USB port to charge Li-Ion batteries, a wall adapter can also
be used. Figure 5 shows an example of how to combine
wall adapter and USB power inputs. A P-channel MOSFET,
MP1, is used to prevent back conduction into the USB
port when a wall adapter is present and Schottky diode,
R NOM =
R NOM =
r HOT
0 . 536
r COLD
3 . 25
? R 25
? R 25
D1, is used to prevent USB power loss through the 1k
pull-down resistor.
Typically, a wall adapter can supply signi?cantly more
current than the 500mA-limited USB port. Therefore, an
N-channel MOSFET, MN1, and an extra program resistor
where r HOT and r COLD are the resistance ratios at the de-
sired hot and cold trip points. Note that these equations
are linked. Therefore, only one of the two trip points can
are used to increase the maximum charge current to
950mA when the wall adapter is present.
be chosen, the other is determined by the default ratios
designed in the IC. Consider an example where a 60°C
hot trip point is desired.
5V WALL
ADAPTER
950mA I CHG
USB
POWER
D1
8
BAT
LTC4095
IN
1
I BAT
From the Vishay Curve 1 R-T characteristics, r HOT is 0.2488
at 60°C. Using the above equation, R NOM should be set
to 46.4k. With this value of R NOM , the cold trip point is
500mA I CHG
MP1
PROG
MN1 1.65k
7
+
1.74k
Li-Ion
BATTERY
about 16°C. Notice that the span is now 44°C rather than
the previous 40°C.
1k
4095 F05
R NOM = COLD HOT ? R 25
Theupperandlowertemperaturetrippointscanbeinde-
pendently programmed by using an additional bias resistor
as shown in Figure 4. The following formulas can be used
to compute the values of R NOM and R1:
r – r
2 . 714
R 1 = 0 . 536 ? R NOM – r HOT ? R 25
12
Figure 5. Combining Wall Adapter and USB Power
Power Dissipation
The conditions that cause the LTC4095 to reduce charge
current through thermal feedback can be approximated
by considering the power dissipated in the IC. For high
4095fa
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| LTC4096 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Input Standalone Li-Ion Battery Chargers |
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