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参数资料
| 型号： | LTC3586EUFE-1#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, PQCC38 |
| 封装： | 4 X 6 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-38 |
| 文件页数： | 19/36页 |
| 文件大小： | 317K |
| 代理商： | LTC3586EUFE-1#PBF |
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LTC3586/LTC3586-1
26
3586fa
APPLICATIONS INFORMATION
Over-Programming the Battery Charger
The USB high power specication allows for up to 2.5W to
be drawn from the USB port (5V 500mA). The PowerPath
switching regulator transforms the voltage at VBUS to just
above the voltage at BAT with high efciency, while limiting
power to less than the amount programmed at CLPROG.
In some cases the battery charger may be programmed
(with the PROG pin) to deliver the maximum safe charging
current without regard to the USB specications. If there
is insufcient current available to charge the battery at the
programmed rate, the PowerPath regulator will reduce
charge current until the system load on VOUT is satised
and the VBUS current limit is satised. Programming the
battery charger for more current than is available will
not cause the average input current limit to be violated.
It will merely allow the battery charger to make use of
all available power to charge the battery as quickly as
possible, and with minimal power dissipation within the
battery charger.
Alternate NTC Thermistors and Biasing
The LTC3586/LTC3586-1 provide temperature qualied
charging if a grounded thermistor and a bias resistor
are connected to NTC. By using a bias resistor whose
value is equal to the room temperature resistance of the
thermistor (R25) the upper and lower temperatures are
pre-programmed to approximately 40°C and 0°C, respec-
tively (assuming a Vishay “Curve 1” thermistor).
The upper and lower temperature thresholds can be ad-
justed by either a modication of the bias resistor value
or by adding a second adjustment resistor to the circuit.
If only the bias resistor is adjusted, then either the upper
or the lower threshold can be modied but not both. The
other trip point will be determined by the characteristics
of the thermistor. Using the bias resistor in addition to an
adjustment resistor, both the upper and the lower tempera-
ture trip points can be independently programmed with
the constraint that the difference between the upper and
lower temperature thresholds cannot decrease. Examples
of each technique are given below.
NTC thermistors have temperature characteristics which
are indicated on resistance-temperature conversion tables.
The Vishay-Dale thermistor NTHS0603N011-N1003F, used
in the following examples, has a nominal value of 100k
and follows the Vishay “Curve 1” resistance-temperature
characteristic.
In the explanation below, the following notation is used.
R25 = Value of the Thermistor at 25°C
RNTC|COLD = Value of thermistor at the cold trip point
RNTC|HOT = Value of the thermistor at the hot trip point
rCOLD = Ratio of RNTC|COLD to R25
rHOT = Ratio of RNTC|COLD to R25
RNOM = Primary thermistor bias resistor
(see Figure 6a)
R1 = Optional temperature range adjustment resistor
(see Figure 6b)
The trip points for the LTC3586/LTC3586-1’s temperature
qualication are internally programmed at 0.349 VBUS for
the hot threshold and 0.765 VBUS for the cold threshold.
Therefore, the hot trip point is set when:
R
RR
VV
NTCHOT
NOM
NTCHOT
BUS
|
.
+
= 0 349
and the cold trip point is set when:
R
RR
VV
NTC COLD
NOM
NTC COLD
BUS
|
.
+
= 0 765
Solving these equations for RNTC|COLDandRNTC|HOTresults
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.
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相关代理商/技术参数 |
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| LTC3586EUFE-1-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency USB Power Manager with Boost, Buck-Boost and Dual Bucks |
| LTC3586EUFE-2#PBF | 功能描述:IC USB POWER MANAGER HE 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:Bat-Track™, PowerPath™ 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压: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:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| LTC3586EUFE-2#TRPBF | 功能描述:IC USB POWER MANAGER HE 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:Bat-Track™, PowerPath™ 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压: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:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| LTC3586EUFE-3#PBF | 功能描述:IC USB POWER MANAGER HE 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:Bat-Track™, PowerPath™ 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压: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:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
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