一,产品概述(General Description)         
       The JTM5459 is a high integrated solution for lithium/polymer battery protection. JTM5459 contains advanced power MOSFET, high-accuracy voltage detection circuits and delay circuits.JTM5459 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.JTM5459 has all the protection functions required in the battery application including over charging, over discharging, over current and
load short protection etc. The accurate over charging 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 time 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 53mΩ RDS(ON)
  Ultra-small SOT23-5 Package
  Only One External Capacitor Required
  Over temperature Protection
  Overcharge Current Protection
  Two-step Over current Detection:
Over discharge Current
Load Short Circuiting
  Charger Detection Function
  Delay Times are generated inside
  High-accuracy Voltage Detection
 Low Current Consumption
  Operation Mode: 2.8μA typ.
  Power-down Mode: 0.1μA max.
 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

JTM5459

五,产品封装图 (Package)

PIN NO.	PIN Name	PIN DESCRIPTION
1	Test	Test pin for reduce delay time
2	GND	Ground
3	VDD	Power Supply
4/5	BATT-	Input pin for current sense, charger detect

 

六.电路原理图


七,功能概述
FUNCTIONAL DESCRIPTION
The JTM5459 monitors the voltage and current of a battery and protects it from being
damaged due to overcharge voltage, over-discharge voltage, over-discharge 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 53mΩ typical.
Overcharge Condition
When the battery voltage becomes higher than the overcharge detection voltage (VDET1)
during charging under normal condition and the state continues for the overcharge detection delay
time (VDET1) or longer, the JTM5459 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 (VRET1), the JTM5459
turns the charging control FET on and returns to the normal condition.
2: When load is connected and discharging starts, the JTM5459 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 load is
connected and discharging starts, and the batt- pin voltage increases about 0.7 V (forward voltage
of the diode) from the GND pin voltage momentarily. The JTM5459 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 (VDET1), the JTM5459 returns to the normal condition
immediately, but in the case the battery voltage is higher than the overcharge detection voltage
(VDET1), the chip does not return to the normal condition until the battery voltage drops below the
overcharge detection voltage (VDET1) even if the load is connected. In addition, if the batt- pin
voltage is equal to or lower than the over current 1 detection voltage when load is connected and
discharging starts, the chip does not return to the normal condition.
Over-discharge Condition
When the battery voltage drops below the over-discharge detection voltage ( VDET2) during
discharging under normal condition and it continues for the over-discharge detection delay time
(TVDET2) or longer, the JTM5459 turns the discharging control FET off and stops discharging. This
condition is called over-discharge condition. After the discharging control FET is turned off, the
batt- pin is pulled up by the resistor between batt- and VDD in JTM5459.
Meanwhile when batt- is bigger than 1.5V (typ.) (the load short-circuiting detection voltage),
the current of the chip is reduced to the power-down current (IPDN). This condition is called
power-down condition. The batt- and VDD pins are shorted by the resistor in the IC under the
over-discharge and power-down conditions. The power-down condition is released , when charger
is connected and the potential difference between batt- and VDD becomes 1.3 V (typ.) or higher
(load short-circuiting detection voltage). At this time, the FET is still off. When the battery voltage
becomes the over-discharge detection voltage (VDET2) or higher (see note), the JTM5459 turns the
FET on and changes to the normal condition from the over- discharge condition.

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