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参数资料
| 型号： | LTC4078EDD-2#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC USB POWER MANAGER 10-DFN |
| 标准包装： | 2,500 |
| 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： | 4.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 带卷 (TR) |
LTC4078/LTC4078X
PIN FUNCTIONS
USBIN (Pin 1): USB Input Supply Pin. This input provides
power to the battery charger assuming a voltage greater
than V UVUSB and less than V OVUSB is present (typically
3.95V to 6V respectively). However, the DCIN input will
take priority if a voltage greater than V UVDC is present at
DCIN (typically 4.15V). The USBIN input allows charge
currents up to 850mA. This pin should be bypassed with
a 1μF capacitor.
IUSB (Pin 2): Charge Current Program for USB Power.
The charge current is set by connecting a resistor, R IUSB ,
to ground. When charging in constant-current mode, this
pin servos to 1V. The voltage on this pin can be used to
measure the battery current delivered from the USB input
using the following formula:
low by an internal N-channel MOSFET. When the charge
cycle is completed, CHRG becomes high impedance. This
output is capable of driving an LED.
ENABLE (Pin 6): Enable Input. When the LTC4078/LTC4078X
are charging from the DCIN source, a logic low on this
pin enables the charger. When the LTC4078/LTC4078X are
charging from the USBIN source, a logic high on this pin
enables the charger. If this input is left ?oating, an internal
2MΩ pulldown resistor defaults the LTC4078/LTC4078X
to charge when a wall adapter is applied and to shut down
if only the USB source is applied.
BATDET (Pin 7): Battery Detection Input. When the volt-
age on this pin falls below V BDET (typically 1.75V), the
charger is on and ready for charging a battery. If this
I BAT =
V IUSB
R IUSB
? 1000
input is left ?oating, an internal pull-up resistor will dis-
able charging.
I TERMINATE =
I BAT =
V IDC
ITERM (Pin 3): Termination Current Threshold Program.
The termination current threshold, I TERMINATE , is set by
connecting a resistor, R ITERM , to ground. I TERMINATE is set
by the following formula:
100V
R ITERM
When the battery current, I BAT , falls below the termination
threshold, charging stops and the CHRG output becomes
high impedance. This pin is internally clamped to approxi-
mately 1.5V. Driving this pin to voltages beyond the clamp
voltage should be avoided.
PWR (Pin 4): Open-Drain Power Supply Status Output.
When the DCIN or USBIN pin voltage is valid to begin charg-
ing (i.e. when the supply is greater than the undervoltage
lockout threshold, less than the overvoltage lockout thresh-
old and at least 120mV above the battery terminal), the
PWR pin is pulled low by an internal N-channel MOSFET.
Otherwise PWR is high impedance. This output is capable
of driving an LED.
CHRG (Pin 5): Open-Drain Charge Status Output. When the
LTC4078/LTC4078X are charging, the CHRG pin is pulled
IDC (Pin 8): Charge Current Program for Wall Adapter
Power. The charge current is set by connecting a resis-
tor, R IDC , to ground. When charging in constant-current
mode, this pin servos to 1V. The voltage on this pin can
be used to measure the battery current delivered from the
DC input using the following formula:
? 1000
R IDC
BAT (Pin 9): Battery Charger Output. This pin provides
charge current to the battery and regulates the ?nal ?oat
voltage to 4.2V.
DCIN (Pin 10): Wall Adapter Input Supply Pin. This input
provides power to the battery charger assuming a voltage
greater than V UVDC and less than V OVDC is present (typi-
cally 4.15V to 6V respectively). A valid voltage on the DCIN
input will always take priority over the USBIN input. The
DCIN input allows charge currents up to 950mA. This pin
should be bypassed with a 1μF capacitor.
Exposed Pad (Pin 11): GND. The exposed backside of the
package is ground and must be soldered to PC board ground
for electrical connection and maximum heat transfer.
4078xfb
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4078X | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Input Li-Ion Battery Charger with Overvoltage Protection |
| LTC4078XEDD#PBF | 功能描述:IC USB POWER MANAGER 12-DFN 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 |
| LTC4078XEDD#TRPBF | 功能描述:IC USB POWER MANAGER 12-DFN 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 |
| LTC4078XEDD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Input Li-Ion Battery Charger with Overvoltage Protection |
| LTC4078XEDD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Input Li-Ion Battery Charger with Overvoltage Protection |
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