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参数资料
| 型号： | LTC4098EUDC-3.6#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, PQCC20 |
| 封装： | 3 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20 |
| 文件页数： | 4/32页 |
| 文件大小： | 1915K |
| 代理商： | LTC4098EUDC-3.6#PBF |
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LTC4098-3.6
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Introduction
The LTC4098-3.6 is a high efficiency power management
and LiFePO4 charger solution designed to make optimal
use of the power available from a variety of sources, while
minimizingpowerdissipationandeasingthermalbudgeting
constraints.TheinnovativePowerPatharchitectureensures
that the application is powered immediately after external
voltage is applied, even with a completely dead battery, by
prioritizing power to the application over the battery.
The LTC4098-3.6 includes a Bat-Track monolithic step-
down switching regulator for USB, wall adapters and other
5V sources. Designed specifically for USB applications,
the switching regulator incorporates a precision average
input current limit for USB compatibility. Because power
is conserved, the LTC4098-3.6 allows the load current
on VOUT to exceed the current drawn by the USB port,
making maximum use of the allowable USB power for
battery charging.
The switching regulator and battery charger communicate
to ensure that the average input current never exceeds the
USB specifications.
For automotive, Firewire, and other high voltage appli-
cations, the LTC4098-3.6 provides Bat-Track control of
an external LTC step-down switching regulator to
maximize battery charger efficiency and minimize heat
production.
When power is available from both the USB and high
voltage inputs, the high voltage input is prioritized and
the USB input is automatically disabled.
TheLTC4098-3.6featuresanovervoltageprotectioncircuit
which is designed to work with an external N-channel
MOSFET to prevent damage to its inputs caused by ac-
cidental application of high voltage.
The LTC4098-3.6 contains both an internal 180m
Ω ideal
diode and an ideal diode controller designed for use with
an external P-channel MOSFET. The ideal diodes from BAT
to VOUT guarantee that ample power is always available
to VOUT even if there is insufficient or absent power at
VBUS or WALL.
Finally, to prevent battery drain when a device is connected
to a suspended USB port, an LDO from VBUS to VOUT
provides either low power or high power USB suspend
current to the application.
Bat-Track Input Current Limited Step Down Switching
Regulator
The power delivered from VBUS to VOUT is controlled
by a 2.25MHz constant-frequency step-down switching
regulator. To meet the USB maximum load specification,
the switching regulator contains a measurement and
control system that ensures that the average input cur-
rent remains below the level programmed at CLPROG.
VOUT drives the combination of the external load and the
battery charger.
If the combined load does not cause the switching
power supply to reach the programmed input current
limit, VOUT will track approximately 0.4V above the
battery voltage. By keeping the voltage across the bat-
tery charger at this low level, power lost to the battery
charger is minimized. Figure 1 shows the power path
components.
If the combined external load plus battery charge
current is large enough to cause the switching power
supply to reach the programmed input current limit,
the battery charger will reduce its charge current by
precisely the amount necessary to enable the external
load to be satisfied. Even if the battery charge current is
programmed to exceed the allowable USB current, the
USB specification for average input current will not be
violated; the battery charger will reduce its current as
needed. Furthermore, if the load current at VOUT exceeds
the programmed power from VBUS, load current will be
drawn from the battery via the ideal diodes even when
the battery charger is enabled.
The current at CLPROG is a precise fraction of the VBUS
current. When a programming resistor and an averaging
capacitorareconnectedfromCLPROGtoGND,thevoltage
on CLPROG represents the average input current of the
switching regulator. As the input current approaches the
programmed limit, CLPROG reaches 1.188V and power
delivered by the switching regulator is held constant.
Several ratios of current are available which can be set
to correspond to USB low and high power modes with a
single programming resistor.
operaTion
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相关代理商/技术参数 |
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| LTC4099 | 制造商:LINER 制造商全称:Linear Technology 功能描述:I2C Controlled USB Power Manager/Charger with Overvoltage Protection |
| LTC4099EPDC#PBF | 功能描述:IC USB PWR MANAGER/CHRGR 20UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:PowerPath™ 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
| LTC4099EPDC#TRMPBF | 制造商:Linear Technology 功能描述: |
| LTC4099EPDC#TRPBF | 功能描述:IC USB PWR MANAGER/CHRGR 20UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:PowerPath™ 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
| LTC4099EPDC-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:I2C Controlled USB Power Manager/Charger with Overvoltage Protection |
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