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| 型号： | LTC4155EUFD#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PQCC28 |
| 封装： | 5 X 4 MM, 0.75 MM HEIGHT, PLASTIC, MO-220WXXX-X, QFN-28 |
| 文件页数： | 10/52页 |
| 文件大小： | 473K |
| 代理商： | LTC4155EUFD#TRPBF |
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LTC4155
18
4155f
OPERATION
Introduction
TheLTC4155isanadvancedI2Ccontrolledpowermanager
and Li-Ion/Polymer battery charger designed to efficiently
transfer up to 15W from a variety of sources while mini-
mizing power dissipation and easing thermal budgeting
constraints. By decoupling VOUT and BAT, the innovative
instant-on PowerPath architecture ensures that the ap-
plication is powered immediately after external voltage is
applied,evenwithacompletelydeadbattery,byprioritizing
power to the application.
Since VOUT and BAT are decoupled, the LTC4155 includes
an ideal diode controller. The ideal diode from BAT to VOUT
guarantees that ample power is always available to VOUT
even if there is insufficient or absent power at VBUS.
The LTC4155 includes a monolithic step-down switch-
ing battery charger for USB support, wall adapters and
other 5V sources. By incorporating a unique input current
measurement and control system, the switching charger
interfaces seamlessly to wall adapters and USB ports
without requiring application software to monitor and
adjust system loads. Because power is conserved, the
LTC4155 allows the load current on VOUT to exceed the
current drawn by the USB port or wall adapter, making
maximum use of the allowable power for battery charging
without exceeding the USB or wall adapter power delivery
specifications. A wide range of input current settings as
well as battery charge current settings are available for
selection by I2C.
Using only one inductor, the switching PowerPath can
operate in reverse, boosting the battery voltage to provide
5V power at its input pin for USB On-The-Go applications.
In the USB-OTG mode, the switching regulator supports
USB high power loads up to 500mA. Protection circuits
ensurethatthecurrentislimitedandultimatelythechannel
is shut down if a fault is detected on the USB connector.
To support USB low power mode, the LTC4155 can deliver
power to the external load and charge the battery through
a linear regulator while limiting input current to less than
100mA.
The LTC4155 also features a combination overvoltage
protection circuit/priority multiplexer which prevents
damage to its input caused by accidental application of
high voltage and selects one of two high power input
connectors based on priority.
A thermistor measurement subsystem periodically
monitors and reports the battery’s thermistor value via
the onboard I2C port. The same circuit then reports when
dangerous battery temperatures are reached and can
autonomouslypausechargingandoptionallyenableabat-
tery safety conditioner. Refer to Overtemperature Battery
Conditioner in the Operation section for further details.
To minimize battery drain when a device is connected to a
suspended USB port, an LDO from VBUS to VOUT provides
the allowable USB suspend current to the application.
An interrupt subsystem can be enabled to alert the host
microprocessor of various status change events so that
system parameters can be varied as needed by system
software. Several status change event categories are
maskable for maximum flexibility.
To eliminate battery drain between manufacture and sale,
a ship-and-store feature reduces the already low battery
standby current to nearly zero and optionally disconnects
power from downstream circuitry.
An input undervoltage amplifier optionally prevents the
input voltage from decreasing below 4.3V when a resistive
cable or current limited supply is providing input power
to the LTC4155.
Finally, the LTC4155 has considerable adjustability built
in so that power levels and status information can be
controlled and monitored via the simple 2-wire I2C port.
Input Current-Limited Step-Down Switching Charger
Power delivery from VBUS to VOUT is controlled by a
2.25MHz constant-frequency step-down switching regu-
lator. The switching regulator reduces output power in
response to one of six regulation loops, including battery
voltage, battery charge current, output voltage, input cur-
rent, input undervoltage, and external PMOS charger FET
power dissipation. For USB low power (100mA) and USB
suspend (2.5mA) modes, the switching regulator is dis-
abled and power is transmitted through a linear regulator.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4155IUFD#PBF | 功能描述:IC I2C POWER MANAGER DUAL 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:PowerPath™ 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTC4155IUFD#TRPBF | 功能描述:IC I2C POWER MANAGER DUAL 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:PowerPath™ 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTC4156EUFD#PBF | 功能描述:IC POWER LI-ION CHARGER 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:* 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 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:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LTC4156EUFD#TRPBF | 功能描述:IC POWER LI-ION CHARGER 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:* 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTC4156IUFD#PBF | 功能描述:IC POWER LI-ION CHARGER 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:* 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 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:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
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