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Linear 公司的LTC4098 是USB兼容的開關(guān)電源管理/鋰離子電池充電器，它具有過壓保護，USB 端口的負載電流高達700mA，輸入電壓從5V 到38V，可廣泛應(yīng)用在媒體播放器，數(shù)碼相機，GPS，PDA和智能手機。本文介紹了LTC4098的主要性能，方框圖和典型應(yīng)用電路，以及多種應(yīng)用案例。

LTC4098 USB Compatible Switching Power Manager/Li-Ion Charger with Overvoltage Protection

The LTC®4098 is a high efficiency USB PowerPathTM controller and full-featured Li-Ion/Polymer battery charger. It seamlessly manages power distribution from multiple sources including USB, wall adapter, automotive, firewire or other high voltage DC/DC converters, and a Li-Ion/Polymer battery.

The LTC4098’s internal switching regulator automatically limits its bbbbb current for USB compatibility. For automotive and other high voltage applications, the LTC4098 interfaces with a Linear Technology external switching regulator to provide a high efficiency high voltage power path. Both the USB and the optional high voltage bbbbbs feature Bat-Track optimized charging to provide maximum
power to the application and ease thermal issues in high power density applications with bbbbb supplies from 5V to as high as 38V.
An overvoltage circuit protects the LTC4098 from high voltage damage on the USB/Wall adaptor bbbbbs with an N-channel FET and a resistor.
The LTC4098 is available in the ultra-thin (0.55mm) 20-Lead 3mm 4mm QFN surface mount package.

主要特性：

■ Switching Regulator with Bat-TrackTM Adaptive Output Control Makes Optimal Use of Limited Power Available from USB Port to Charge Battery and Power Application
■ Overvoltage Protection Guards Against Damage
■ Bat-Track External Step-Down Switching Regulator Control Maximizes Efficiency from Automotive, Firewire and Other High Voltage Sources
■ 180mInternal Ideal Diode Plus External Ideal Diode Controller Seamlessly Provide Low Loss PowerPath When bbbbb Power is Limited or Unavailable
■ Full Featured Li-Ion/Polymer Battery Charger
■ “Instant-On” Operation with Discharged Battery
■ 700mA Maximum Load Current from USB Port
■ 1.5A Maximum Charge Current with Thermal Limiting
■ Slew Control Reduces Switching EMI
■ Ultra-Thin (0.55mm) 20-Lead 3mm 4mm QFN

應(yīng)用：
■ Media Players
■ Digital Cameras
■ GPS
■ PDAs
■ Smart Phones



圖1。LTC4098方框圖




圖2。LTC4098典型應(yīng)用電路

典型應(yīng)用電路案例：

1．高效USB/汽車電子充電器



High Efficiency USB/Automotive Battery Charger with Overvoltage
Protection, Reverse-Voltage Protection and Low Battery Start-Up

2．USB/墻上適配器電池充電器

USB/Wall Adapter Battery Charger with Dual Overvoltage Protection,
Reverse-Voltage Protection and Low Battery Start-Up



3．USB/汽車電子電池充電器
USB/Automotive Switching Battery Charger with
Automatic Current Limiting on Both bbbbbs



4．低成本和汽車電子高效功率管理器
Low Cost USB and Automotive High Efficiency Power Manager with Low Battery Start-Up