ME4075是一款完整的单节锂离子电池用恒定电流/恒定电压线性充电芯片。其中SOT23-5封装与较少的外部元器件数目使得ME4075成为便携式应用的理想选择。而且ME4075是专为在USB电源规范内工作而设计的。
由于采用内部MOSFET构架，所以不需要外部检测电阻器和隔离二极管。热反馈可对充电电流进行调节以便在大功率操作或高环境温度条件下对芯片温度加以限制。充电电压固定为3.6V，而充电电流可通过一--个电阻器进行外部设置。当充电电流在达到终浮充电压之后降至设定值的1/10时，ME4075 将自动终止充电循环。
当输入电压( 交流适配器或USB电源)被拿掉时，ME4075自动进入一个低电流状态，将电池漏电流降至2uA以下，可将ME4075置于停机模式，从而将供电电流降至55μA。
ME4075的其他特点包括充电电流监控器、欠压闭锁、自动再充电和-一个用于指示充电结束和输入电压接入的状态引脚。
特点
大可编程充电电流800mA
充电终止: C/10 充电终止
充电状态输出引脚，LED开/关两种状态
无需MOSFET、检测电阻器和隔离二极管
用于单节锂离子电池、采用SOT23-5封装的完整线性充电器
恒定电流1恒定电压操作，并具有可在无过热危险的情况下实现充电速率大化的热调节功能
直接从USB端口给锂离子电池充电
高精度的3.6V预设充电电压
用于电池电量检测的充电电流监控器输出
自动再充电
停机模式 下供电电流为55μA
2.4V涓流充电门限
软启动限制 了浪涌电流
应用场合：充电座 蓝牙应用
封装形式：5-pin SOT23-5
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
