The JTM5451 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 JTM5451 product is a high integration solution for lithium-ion/polymer battery protection.
        JTM5451 contains advanced power MOSFET, high-accuracy voltage
detection circuits and delay circuits.JTM5451 is put into an ultra-small
SOT23-5 package and only one external component makes it an ideal
solution in limited space of battery pack.JTM5451 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 Reverse Connection
Integrate Advanced Power MOSFET
with Equivalent of 45mΩ RDS(ON)
Ultra-small SOT23-5 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: 2.8μ A typ.
Power-down Mode: 0.1μ 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

JTM5451

五,产品封装图 (Package)

JTM5451 PIN NUMBER	PIN NAME	PIN DESCRIPTION
1	VT	Test pin；only for vendor,not used by application
2	GND	Ground, connect the negative terminal of the battery to this pin
3	VDD	Power Supply
4,5	VM	The negative terminal of the battery pack. The internal FET switch connects this terminal to GND

六.电路原理图

七,功能概述
The JTM5451 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 45mΩ 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 JTM5451 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
JTM5451 turns the charging control FET on and returns to the normal condition.
2, When a load is connected and discharging starts, the JTM5451 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 JTM5451 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 JTM5451
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 1 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
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