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参数资料
| 型号： | LTC4085EDE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/24页 |
| 文件大小： | 0K |
| 描述： | IC USB POWER MANAGER 14-DFN |
| 标准包装： | 91 |
| 功能： | 电源管理 |
| 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： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-DFN-EP（4x3） |
| 包装： | 管件 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
LTC4085
PIN FUNCTIONS
WALL (Pin 7): Wall Adapter Present Input. Pulling this
pin above 4.25V will disconnect the power path from IN
to OUT. The ACPR pin will also be pulled low to indicate
that a wall adapter has been detected.
NTC (Pin 8): Input to the NTC Thermistor Monitoring
Circuits. Under normal operation, tie a thermistor from
the NTC pin to ground and a resistor of equal value
from NTC to V NTC . When the voltage on this pin is above
the charge current drops below 10% of the programmed
charge current (while in voltage mode) or the input supply
or output supply is removed, the CHRG pin is forced to a
high impedance state.
PROG (Pin 12): Charge Current Program. Connecting a
resistor, R PROG , to ground programs the battery charge
current. The battery charge current is programmed as
follows:
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.
I CHG (A) =
50,000V
R PROG
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.
Connect the NTC pin to ground to disable this feature. This
will disable all of the LTC4085 NTC functions.
V NTC (Pin 9): Output Bias Voltage for NTC. A resistor from
this pin to the NTC pin will bias the NTC thermistor.
ACPR (Pin 10): 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. This feature is disabled if no
power is present on IN or OUT or BAT (i.e., below UVLO
thresholds).
CHRG (Pin 11): 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
GATE (Pin 13): External Ideal Diode Gate Pin. This pin
can be used to drive the gate of an optional external
PFET connected between BAT and OUT. By doing so, the
impedance of the ideal diode between BAT and OUT can be
reduced. When not in use, this pin should be left floating.
It is important to maintain a high impedance on this pin
and minimize all leakage paths.
BAT (Pin 14): Connect to a single cell Li-Ion battery. This
pin is used as an output when charging the battery and
as an input when supplying power to OUT. When the OUT
pin potential drops below the BAT pin potential, an ideal
diode function connects BAT to OUT and prevents V OUT
from dropping significantly below V BAT . A precision internal
resistor divider sets the final float (charging) potential on
this pin. The internal resistor divider is disconnected when
IN and OUT are in undervoltage lockout.
Exposed Pad (Pin 15): Ground. The exposed package pad
is ground and must be soldered to the PC board for proper
functionality and for maximum heat transfer.
4085fd
9
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相关代理商/技术参数 |
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| LTC4085EDE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:USB Power Manager with Ideal Diode Controller and Li-Ion Charger |
| LTC4088 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency Battery Charger/USB Power Manager |
| LTC4088_12 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Battery Charger/USB Power Manager |
| LTC4088-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency Battery Charger/USB Power Manager with Regulated Output Voltage |
| LTC4088-1_12 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Battery Charger/USB Power Manager |
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