参数资料
型号: LTC4055EUF
厂商: Linear Technology
文件页数: 9/24页
文件大小: 0K
描述: IC USB PWR MNGR BATT CHRGR 16QFN
标准包装: 91
功能: 充电管理
电池化学: 锂离子(Li-Ion)
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: 16-WQFN 裸露焊盘
供应商设备封装: 16-QFN(4x4)
包装: 管件
LTC4055/LTC4055-1
PIN FUNCTIONS
TIMER (Pin 12): Timer Capacitor. Placing a capacitor C TIMER
to GND sets the timer period. The timer period is:
V NTC (Pin 15): Output Bias Voltage for NTC. A resistor
from this pin to the NTC pin will set up the bias for an
t TIMER ( Hours ) =
C TIMER ? R PROG ? 3 Hours
0 . 1 μ F ? 100 k
NTC thermistor.
NTC (Pin 16): Input to the NTC Thermistor Monitoring
Circuits. Under normal operation, tie a thermistor from
Charge time is increased as charge current is reduced due
to input voltage regulation, load current and current limit
selection (HPWR).
Shorting the TIMER pin to GND disables the battery
charging functions.
ACPR (Pin 13): Wall Adapter Present Output. Active low
open-drain output pin. A low on this pin indicates that the
wall adapter input comparator has had its input pulled
above the input threshold and power is present on IN1/IN2
or OUT (i.e., above UVLO threshold).
CHRG (Pin 14): Open-Drain Charge Status Output. When
the battery is being charged, the CHRG pin is pulled low
by an internal N-channel MOSFET. When the timer runs
out or the input supply or output supply is removed, the
CHRG pin is forced to a high impedance state.
the NTC pin to ground and a resistor of equal value from
NTC to V NTC . When the voltage on this pin is above 0.74
? V VNTC (Cold, 0°C) or below 0.29 ? V VNTC (Hot, 50°C)
the timer is suspended, but not cleared, the charging is
disabled and the CHRG pin remains in its former state.
When the voltage on NTC comes back between 0.74 ?
V VNTC and 0.29 ? V VNTC , the timer continues where it
left off and charging is re-enabled if the battery voltage
is below the recharge threshold. There is approximately
3°C of temperature hysteresis associated with each of the
input comparators.
If the NTC function is not to be used, connect the NTC to
ground. This will disable all of the LTC4055/LTC4055-1
NTC functions.
Exposed Pad (Pin 17): Ground. The Exposed Pad must be
soldered to a good thermally conductive PCB ground.
4055fb
9
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LTC4055EUF-1#PBF 功能描述:IC USB PWR MNGR BATT CHRGR 16QFN 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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