SD8079是可以通过外部电阻编程的恒流/恒压充电的充电管理电路。该器件内部包括功率晶体管，应用时不需要外
部的电流检测电阻和阻流二极管。SD8079只需要极少的外围元器件，并且符合USB 总线技术规范，非常适合于便携
式应用的领域。
热调制电路可以在器件的功耗比较大或者环境温度比较高的时候将芯片温度控制在安全范围内。通过外部电阻可以
编程输出电压，充电电流也是通过一个外部电阻设置。当输入电压（交流适配器或者USB 电源）掉电时，SD8079 自动
进入低功耗的睡眠模式，此时电池的电流消耗小于0.1μA。内置防反灌保护电路,当电池电压高于输入电压时,自动关闭
内置功率MOSFET。其它功能包括输入电压过低锁存，自动再充电，内置OVP 保护以及充电状态/充电结束状态指示等
功能。
SD8079内部采用了带有专利的技术实现了电池防反接保护。当电池反接后，停止充电，指示灯全灭。
SD8079采用散热增强型的ESOP-8。
■ 产品特点
. 在封装允许范围内可编程是充电电流可达1.2A 以上
. 不需要外部MOSFET，传感电阻和阻流二极管
. 小的尺寸实现对电池的完全线形充电管理
. 恒电流/恒电压运行和热度调节使得电池管理效力高，没有热度过高的危险
. 充电电压通过FB 可以调节
. 充电电流输出监控
. 充电状态指示标志和充满状态标志
. 3/10 充电电流终止
. 自动再充电
. 停止工作时提供40.A 电流
. 0.2 倍编程电压涓流充电阈值电压
. 软启动限制浪涌电流电流
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
