The JTM9903 product is a high integration solution for lithi

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 JTM9903 product is a high integration solution for lithium-ion/polymer battery protection.
     JTM9903 contains advanced power MOSFET, high-accuracy voltage
detection circuits and delay circuits.JTM9903 is put into an SOP8-PP
package and only one external component makes it an ideal solution in
limited space of battery pack.JTM9903 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-powered information appliances requiring long-term battery life

二.产品特点(Features)
Protection of Charger Reverse Connection Protection of Battery Cell
          ReverseConnection
Integrate Advanced Power MOSFET
with Equivalent of 36mΩ RDS(ON)
SOP8-PP Package
Only One External Capacitor &
Resistor 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:2.8μ A typ.
Power-down Mode: 1.5μ 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

jtm9903

五,产品封装图 (Package)

JTM9903 PIN NUMBER	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 JTM9903

六.电路原理图

七,功能概述
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
JTM9903 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), the
JTM9903 turns the charging control FET
on and returns to the normal condition.
2, When a load is connected and
discharging starts, the JTM9903 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
JTM9903 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 JTM9903 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 the
overcharge 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

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