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参数资料
| 型号： | LTC3559EUD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/24页 |
| 文件大小： | 0K |
| 描述： | IC USB CHARGER 16-QFN |
| 标准包装： | 121 |
| 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： | 4.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 包装： | 管件 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
LTC3559/LTC3559-1
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 battery charger 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
R NOM =
r HOT
0 . 536
? R 25
diode, D1, is used to prevent USB power loss through the
1k pull-down resistor.
R NOM =
r COLD
? R 25
3 . 25
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
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 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
D1
BAT
BATTERY
CHARGER
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
POWER
500mA I CHG
MP1
V CC
PROG
+
Li-Ion
BATTERY
to 46.4k. With this value of R NOM , the cold trip point is
about 16°C. Notice that the span is now 44°C rather than
1k
MN1 1.65k
1.74k
the previous 40°C.
The upper and lower temperature trip points can be inde-
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:
3559 F05
Figure 5. Combining Wall Adapter and USB Power
r COLD HOT
R NOM =
– r
2 . 714
? R 25
R 1 = 0 . 536 ? R NOM – r HOT ? R 25
16
3559fb
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3559EUD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Linear USB Battery Charger with Dual Buck Regulators |
| LTC3560 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.25MHz, 800mA Synchronous Step-Down Regulator in ThinSOT |
| LTC3560E | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.25MHz, 800mA Synchronous Step-Down Regulator in ThinSOT |
| LTC3560ES6 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.25MHz, 800mA Synchronous Step-Down Regulator in ThinSOT |
| LTC3560ES6#PBF | 制造商:Linear Technology 功能描述:2.1 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
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