- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄30771 > LTC4095EDC (LINEAR TECHNOLOGY CORP) 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 PDF資料下載
參數(shù)資料
| 型號： | LTC4095EDC |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 2 X 2 MM, 0.75 MM HEIGHT, PLASTIC, DFN-8 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大小： | 225K |
| 代理商： | LTC4095EDC |
LTC4095
12
4095fa
APPLICATIONS INFORMATION
Figure 5. Combining Wall Adapter and USB Power
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, rHOT is 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 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,
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.
IN
MP1
MN1
1k
1.74k
1.65k
1
IBAT
8
7
Li-Ion
BATTERY
4095 F05
LTC4095
BAT
USB
POWER
500mA ICHG
5V WALL
ADAPTER
950mA ICHG
PROG
+
D1
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC4095EDC#TRM | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| LTC4099EPDC#TRPBF | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC20 |
| LTC4099EUDC#TRPBF | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC20 |
| LTC4217CDHC-12#PBF | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO16 |
| LTC4217IFE | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO20 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4095EDC#TRMPBF | 功能描述:IC CHARGER LI-ION/POLY 8-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關(guān)文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標(biāo)準(zhǔn)包裝:4,000 系列:- 功能:燃料，電量檢測計(jì)/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2 |
| LTC4095EDC#TRPBF | 功能描述:IC CHARGER LI-ION/POLY 8-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC4096 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Input Standalone Li-Ion Battery Chargers |
| LTC4096EDD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Input Standalone Li-Ion Battery Chargers |
| LTC4096EDD#PBF | 功能描述:IC CHARGER LI-ION DL 10-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。