SD4054是一个完善的单片锂离子电池恒流/恒压线形电源管理芯片。它薄的尺寸和小的外包装使它便于便携应用。更值得一提的是，SD4054 专门设计适用于 USB 的供电规格。 得益于内部的 MOSFET 结构，在应用上不需要外部电阻和阻塞二极管。在高能量运行和高外围温度时，热反馈可以控制充电电流以降低芯片温度。充电电压被限定在 4.2V，充电电流通过外部电阻调节。在达到目标充电电压后，当充电电流降低到设定值的 1/10 时，SD4054 就会自动结束充电过程。 当输入端（插头或 USB 提供电源）拔掉后，SD4054 自动进入低电流状态，电池漏电流将降到 2μA以下。SD4054 还可被设置于停止工作状态，使电源供电电流降到 25μA。 其余特性包括：充电电流监测，输入低电压闭锁，自动重新充电和充电已满及开始充电的标志。
■ 产品特性
可编程使充电电流可达 800mA.
不需要 MOSFET，传感电阻和阻塞二极管
小的尺寸实现对锂离子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
从 USB 接口管理单片锂离子电池
预设充电电压为 4.2V ±1%
充电电流输出监控
充电状态指示标志
1/10 充电电流终止
停止工作时提供 25μA 电流
2.9V 涓流充电阈值电压
软启动限制浪涌电流电流
采用 SOT23-5
■ 应用场合 ：手机，PDA，MP3 蓝牙应用
■ 封装形式 ：SOT-23-5
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
