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参数资料
| 型号： | LTC4075HVXEDD#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封装： | 3 X 3 MM, 0.75 MM HEIGHT, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件页数： | 4/16页 |
| 文件大小： | 170K |
| 代理商： | LTC4075HVXEDD#TR |
LTC4075HVX
12
4075hvxf
APPLICATIONS INFORMATION
Using a Single Charge Current Program Resistor
The LTC4075HVX can program the wall adapter charge
current and USB charge current independently using two
program resistors, RIDC and RIUSB. Figure 2 shows a
charger circuit that sets the wall adapter charge current
to 800mA and the USB charge current to 500mA.
In applications where the programmed wall adapter
charge current and USB charge current are the same, a
single program resistor can be used to set both charge
currents. Figure 3 shows a charger circuit that uses one
charge current program resistor.
Stability Considerations
The constant-voltage mode feedback loop is stable without
any compensation provided a battery is connected to the
charger output. However, a 1μF capacitor with a 1Ω series
resistor is recommended at the BAT pin to keep the ripple
voltage low when the battery is disconnected.
When the charger is in constant-current mode, the charge
current program pin (IDC or IUSB) is in the feedback loop,
not the battery. The constant-current mode stability is af-
fected by the impedance at the charge current program pin.
With no additional capacitance on this pin, the charger is
stable with program resistor values as high as 20k (ICHRG
= 50mA); however, additional capacitance on these nodes
reduces the maximum allowed program resistor.
Power Dissipation
When designing the battery charger circuit, it is not neces-
sary to design for worst-case power dissipation scenarios
because the LTC4075HVX automatically reduces the charge
current during high power conditions. The conditions that
cause the LTC4075HVX to reduce charge current through
thermal feedback can be approximated by considering the
power dissipated in the IC. Most of the power dissipation
is generated from the internal charger MOSFET. Thus, the
power dissipation is calculated to be:
PD = (VIN – VBAT) IBAT
PD is the dissipated power, VIN is the input supply volt-
age (either DCIN or USBIN), VBAT is the battery voltage
and IBAT is the charge current. The approximate ambient
temperature at which the thermal feedback begins to
protect the IC is:
TA = 125°C – PD θJA
TA = 125°C – (VIN – VBAT) IBAT θJA
Example: An LTC4075HVX operating from a 5V wall
adapter (on the DCIN input) is programmed to supply
800mA full-scale current to a discharged Li-Ion battery
with a voltage of 3.3V.
Figure 3. Dual Input Charger Circuit. The Wall Adapter Charge
Current and USB Charge Current are Both Programmed to be
500mA
Figure 2. Dual Input Charger with Independant Charge Currents
In this circuit, the programmed charge current from both the
wall adapter supply is the same value as the programmed
charge current from the USB supply:
II
V
R
CHRG DC
CHRG USB
ISET
==
1000
RIDC
1.24k
1%
RIUSB
2k
1%
RITERM
1k
1%
WALL
ADAPTER
USB
PORT
1
μF
1
μF
+
800mA (WALL)
500mA (USB)
4075hvx F02
LTC4075HVX
DCIN
USBIN
IUSB
IDC
BAT
ITERM
GND
RISET
2k
1%
RITERM
1k
1%
WALL
ADAPTER
USB
PORT
1
μF
1
μF
+
500mA
4075hvx F03
LTC4075HVX
DCIN
USBIN
IUSB
IDC
BAT
ITERM
GND
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4075X | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Input USB/AC Adapter Standalone Li-Ion Battery Chargers |
| LTC4075XEDD | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Input USB/AC Adapter Standalone Li-Ion Battery Chargers |
| LTC4076 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Input Standalone Li-Ion Battery Charger |
| LTC4076EDD | 功能描述:IC CHARG BATT LI-ON USB 10DFN RoHS:否 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 |
| LTC4076EDD#PBF | 功能描述:IC CHARG BATT LI-ON USB 10DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:2,000 系列:Impedance Track™ 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:2.4 V ~ 2.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:带卷 (TR) 产品目录页面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名称:296-21665-2 |
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