RT9501A/RT9501B 先進的鋰離子線性電池充電器(

RT9501A/RT9501B 先進的鋰離子線性電池充電器(應用電路)

The RT9501 is a single Lithium-Ion or Lithium-Polymer cell linear battery charger which is designed for compact and cost-sensitive handheld devices. It combines charge status indication, charge termination, battery temperature monitoring, and high accuracy current and voltage regulation in a MSOP-8 package.
The RT9501 charges the battery in three modes, precharge, constant current, constant voltage. If the battery voltage is below the precharge threshold VO(MIN), the RT9501 precharges the battery with a lower conditioning current. After precharge, the RT9501 applies a constant current to the battery. An external sense-resister sets the charge current. The constant voltage mode continues until the battery reaches the regulation voltage.
The battery temperature is continuously measured by an external thermistor through the TS pin. The RT9501 inhibits charge until the temperature is within the range defined by users.

Ordering Info

Note :
RichTek Pb-free and Green products are :
? RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-
?? 020.
? Suitable for use in SnPb or Pb-free soldering processes.
? 100%matte tin (Sn) plating.

Features

? For Single Lithium-Ion or Lithium-Polymer Cell Battery Pack (4.1V or 4.2V)
? A Few External Components are Required
? Precharge, Constant Current, Constant Voltage Modes
? Battery Temperature Monitor
? Charge Status Indication
? Automatic Battery Recharge
? Charge Termination Detect
? Auto Low Power Sleep Mode when VDD Power is Removed
? MSOP-8 Package
? RoHS Compliant and 100% Lead (Pb)-Free

Application

? Digital Cameras
? PDAs
? Cellular Phones
? Information Appliance

Pin Configurations

(TOP VIEW)


MSOP-8

Typical Applications Circuit

?

Figure 1. Application circuit using P-Channel MOSFET

?

Figure 2. Application circuit using PNP transistor

RT9501A/RT9501B PDF datesheet