ME4057N是一款耐压9V的单节锂离子电池恒压恒流充电管理芯片,大充电电流可达1.3A。由于线性充电器在输入和输出大压差情况下会严重发热，其内部有热反馈电路可以对在充电过程中对芯片温度加以控制将充电电流调节到较低水平，以适应相应的系统散热要求。采用带有散热PAD的SOP8封装形式，外加很少的外部原件，使其成为便携应用的理想选择。ME4057-N不需要电流检测电阻，也不需要外部隔离二极管实现防倒灌应用。充电截止电压固定在
4.2V/4.34V/4.4V，充电电流可以外接电阻调节，当充电电流达到恒流电流的1/10时，ME4057-N将终止充电。
当输入电压(适配器或USB)被拿掉后，ME4057-N进入睡眠模式。芯片内部自动关断充电通路，输入电压变低。此时电池漏电流降低到2uA以下。当ME4057-N有电源而电池拿掉时，芯片电流为降低至55uA，来降低系统损耗。ME4057-N还具有电池温度检测，输入欠压锁定，
自动再充电和两个充电指示引脚。
特点
高工作电压到9V,提高系统可靠性
可编程充电电流可达1.3A(ESOP8);1A(DFN2*2-8L)
防电池反接保护功能
内部热反馈保护功能,控制系统在合理充电范围
无需MOSFET，检测电阻或隔离二极管 采用ESOP8封装的单节完整线 性充电器
恒流恒压切换
精度可达士1%的4.2V/4.34V14.4V固定充电截止 电压
自动再充电功能
充电状态双输出，无电池和故障状态显示
C/10终止充电
待机电流55uA
2.9V涓流切换阈值
软启动限制浪涌电流
电池温度监测功能
应用场合:移动电话 数码相机 MP3 MP4播放器 蓝牙应用 便携设备 USB电源 适配器
封装形式：8- pin ESOP8 DFN2*2-8
The LY73XX series is a set of three-terminal, low power, high voltage regulators implemented in CMOS ogy. The series features extremely low quiescent cur-technol-rent which is typically 4uμA. They high as 12V. The device provides large current with aallow input voltages as significantly small dropout voltage.
The LY73XX consists of a high-precision voltage refer- ence, an error correction circuit, and a current limnited output driver. They are available with several fixed out-put voltages ranging from 1.8V to 5.0V. CMOS technol-ogy ensures low dropout voltage and low current consumption. Although designed primarily as fixed volt-age regulators, these devices can be used with external components to generate variable voltages and currents.
Features
UItra low quiescent current: 4μA (typ.)
High input voltage (up to 12V)
Output voltage:1.8V, 2.5V, 2.7V, 3.0V, 3.3V, 3.5V, 5.0V
Output voltage accuracy: tolerance +3%
Maximum output current: 250mA
Low dropout voltage
Low temperature coefficient
package：TO-92, SOT-89-3 SOT23-3
Application
Battery-powered equipment
Voltage regulator for microprocessor
Voltage regulator for L AN cards
Wireless Communication equipment
Audio/Video equipment
LY76XX serieslow-dropoutlinear voltage regulators with a built-in voltage reference module, error correction module and phase compensation module. LY76XX series are based on the CMOS process and allow high voltage input with low quiescent current. This series can deliver 100mA output current and allow an input voltage as high as 40V.This series has the function of internal feedback resistor setting from 2.1Vto 12V. The output accuracy is t 2%.
Features
High output accuracy:土2%
Input voltage: up to 40 V
Output voltage: 2.1V ~ 12V
Utralow quiescent current (Typ.=3μA) Output Current: lour= 100mA
(When VIN = 5.5V and Vout =3.3V)Low temperature cofficient
Ceramic capacitor can be used
Package: SOT89-3. T092、SOT23-3
Typical Application
Electronic weighbridge
SCM
Phones, cordless phones
Security Products
Water meters, power meters
