The JTM9902C,JTM9902a,JTM9902b Series product is a high int

1.产品概述         2.产品特点
3.应用范围       4.下载产品资料PDF文档
5.产品封装图                     6.电路原理图
7.功能概述       8.相关产品

一,产品概述(General Description)
      The JTM9902C Series product is a high integration solution for lithium-
ion/polymer battery protection.JTM9902C contains advanced power MOSFET, high-accuracy voltage detection circuits and delay circuits.
     JTM9902C is put into an SOP8-PP package and only one externalcomponent makes it an ideal solution in limited space of battery pack.
     JTM9902C has all the protection functions required in the battery application including overcharging, overdischarging, overcurrent and load short circuiting protection etc. The accurate overcharging detection voltage ensures safe and full utilization charging. The low standby current drains little current from the cell while in storage.The device is not only targeted for digital cellular phones, but also for any other Li-Ion and Li-Poly battery-poweredinformation appliances requiring long-
term battery life.

二.产品特点(Features)
Protection of Charger Reverse Connection Protection of Battery Cell Reverse Connection
Integrate Advanced Power MOSFET
with Equivalent of 20mΩ RDS(ON)
SOP8-PP Package
Only One External Capacitor
Required
Over-temperature Protection
Overcharge Current Protection
·Two-step Overcurrent Detection:
Overdischarge Current
Load Short Circuiting
Charger Detection Function
0V Battery Charging Function
Delay Times are generated inside
High-accuracy Voltage Detection
Low Current Consumption
Operation Mode:6μ A typ.
Power-down Mode: 3μ A typ.
RoHS Compliant and Lead (Pb) Free

三,应用范围 (Applications)
One-Cell Lithium-ion Battery Pack
Lithium-Polymer Battery Pack

四.下载产品资料PDF文档

jtm9902

五,产品封装图 (Package)

JTM9902C PIN	PIN NAME	PIN DESCRIPTION
1,2,3,4	VM	The negative terminal of the battery pack. The internal FET switch connects this terminal to GND
5,7,8	GND	Ground, connect the negative terminal of the battery to this pin
6	VDD	Power Supply
9	EPAD	Exposed pad，please connect with GND of JTM9902C

六.电路原理图

七,功能概述
The JTM9902C monitors the voltage and current of a battery and protects it from being damaged due to overcharge voltage,overdischarge voltage, overdischarge current, and short circuit conditions by disconnecting the battery from the load or charger. These functions are required in order to operate the battery cell within specified limits.
The device requires only one external capacitor. The MOSFET is integrated and its RDS(ON) is as low as 20mΩ typical.

Normal operating mode
If no exception condition is detected,charging and discharging can be carried out freely. This condition is called the
normal operating mode.
Overcharge Condition
When the battery voltage becomes higher than the overcharge detection voltage (VCU) during charging under normal condition and the state continues for the overcharge detection delay time (tCU) or longer, the
JTM9902C turns the charging control FET off to stop charging. This condition is called the overcharge condition. The overcharge condition is released in the following two cases:
1, When the battery voltage drops below the overcharge release voltage (VCL), theJTM9902C turns the charging control FET on and returns to the normal condition.
2, When a load is connected and discharging starts, the JTM9902C turns the charging control FET on and returns to the
normal condition. The release mechanism is as follows: the discharging current flows through an internal parasitic diode of the charging FET immediately after a load is connected and discharging starts, and the VM pin voltage increases about 0.7 V (forward voltage of the diode) from the GND pin voltage momentarily. The
JTM9902C detects this voltage and releases the overcharge condition. Consequently, in the case that the battery voltage is equal to or lower than the overcharge detection voltage (VCU), the JTM9902C returns to the normal condition immediately, but in the case the battery voltage is higher than the overcharge detection voltage (VCU),the chip
does not return to the normal condition until the battery voltage drops below theovercharge detection voltage (VCU) even if the load is connected. In addition, if the VM pin voltage is equal to or lower than the overcurrent detection voltage when a load is connected and discharging starts, the chip does not return to the normal condition.
Remark If the battery is charged to a voltage higher
than the overcharge detection voltage (VCU) and the battery voltage does not drops below the overcharge detection voltage (VCU) even when a heavy load, which causes an overcurrent, is connected, the overcurrent do not work until the
battery voltage drops below the overcharge detection voltage (VCU). Since an actual battery has,
however, an internal impedance of several dozens of mΩ , and the battery voltage drops immediately
after a heavy load which causes an overcurrent is connected, the overcurrent work. Detection of load
short-circuiting works regardless of the battery voltage.

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产品应用：

1.节能灯照明/电子镇流器

2.LED电源

3.电源（开关电源、UPS电源、通信电源等）

4.充电器

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6.电源板