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参数资料
| 型号： | LTC3559EUD |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.05 A BATTERY CHARGE CONTROLLER, 2590 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封装： | 3 X 3 MM, PLASTIC, MO-220WEED-2, QFN-16 |
| 文件页数： | 8/24页 |
| 文件大小： | 302K |
| 代理商： | LTC3559EUD |
LTC3559
16
3559f
APPLICATIONS INFORMATION
Solving these equations for RNTC|COLD and RNTC|HOT
results in the following:
RNTC|HOT = 0.536 RNOM
and
RNTC|COLD = 3.25 RNOM
By setting RNOM equal to R25, the above equations result
in rHOT = 0.536 and rCOLD = 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, RNOM, 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:
R
r
R
r
R
NOM
HOT
NOM
COLD
=
0 536
25
325
25
.
.
where rHOT and rCOLD 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
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.
From the Vishay Curve 1 R-T characteristics, rHOTis 0.2488
at 60°C. Using the above equation, RNOM should be set
to 46.4k. With this value of RNOM, the cold trip point is
about 16°C. Notice that the span is now 44°C rather than
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 RNOM and R1:
R
rr
R
RR
r
NOM
COLD
HOT
NOM
HOT
=
–
.
.
–
2 714
25
1 0 536
R
R25
For example, to set the trip points to 0°C and 45°C with
a Vishay Curve 1 thermistor choose:
Rk
k
NOM ==
3 266 0 4368
2 714
100
104 2
.– .
.
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
diode, D1, is used to prevent USB power loss through the
1k pull-down resistor.
Typically, a wall adapter can supply signicantly 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.
VCC
MP1
MN1
1k
1.74k
1.65k
IBAT
Li-Ion
BATTERY
3559 F05
BATTERY
CHARGER
BAT
USB
POWER
500mA ICHG
5V WALL
ADAPTER
950mA ICHG
PROG
+
D1
Figure 5. Combining Wall Adapter and USB Power
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相关代理商/技术参数 |
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| LTC3559EUD#PBF | 功能描述:IC USB CHARGER 16-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 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-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LTC3559EUD#PBF | 制造商:Linear Technology 功能描述:IC BATT CHARGER W/BUCK REG 16QFN 制造商:Linear Technology 功能描述:IC, BATT CHARGER, W/BUCK REG, 16QFN |
| LTC3559EUD#TRPBF | 功能描述:IC USB CHARGER 16-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 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:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC3559EUD-1#PBF | 功能描述:IC USB BATTERY CHARGER 16-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 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:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC3559EUD-1#TRPBF | 功能描述:IC USB BATTERY CHARGER 16-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 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:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
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