EC9526A|One-cell Lithium Battery Protection IC

EC9526A|One-cell Lithium Battery Protection IC


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One-cell ​​ Lithium ​​ Battery ​​ Protection ​​ IC

EC9526A

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General Description

The EC9526A battery protection IC is designed to protect lithium-ion / polymer battery from damage or degrading

the lifetime due to over current for one-cell lithium-ion / polymer battery powered systems. such as cellular phones。

The ultra-small package and less required external components make it ideal to integrate the EC9526A into the ​​ limited space of battery pack. The accurate ±50mV overcharging detection voltage ensures safe and full utilization charging. The very low standby current drains little current from the cell while in storage。

 

Features

High-accuracy voltage detection circuit

Overcharge detection voltage3.6V to 4.4VAccuracy ± 50mV

Overcharge release voltage3.6V to 4.4VAccuracy ± 50mV

Overdischarge detection voltage2.0V to 3.0VAccuracy ± 100mV

Overdischarge release voltage2.0V to 3.4VAccuracy ± 100mV

Discharge overcurrent detection voltage0.05V to 0.3VAccuracy ± 30mV

Load short-circuiting detection voltage1.1VAccuracy ± 200mV

Detection delay times are generated by an internal circuit

(external capacitors are unnecessary)

Overcharge detection delay timeTypical. 100ms

Overdischarge detection delay timeTypical.100ms

Discharge overcurrent detection delay timeTypical.10ms

Load short-circuiting detection delay timeTypical 450μs

  • High  voltage  tolerance  is  used  for  charger  connection  pins,  VM  and  CO  pins  are

absolute maximum rating 15V

Wide operation temperature range -40 ~ +85℃

Low current consumption

Operation mode    ​​​​ Typ. 2.4 μA / Max. 6.0 μA (25℃)

Standby modeGreen-modeMax. 0.1 μA (25℃)

Self-recovery functionMax. 3.0 μA (25℃)

Small package SOT23-6L

Lead-free / Green product

 

Applications

Protection IC for One-Cell Lithium-ion

Lithium-Polymer Rechargeable Battery Packs

 

Block Diagram

 

Ordering Information

Package
Part Number
Marking
Marking Information

SOT23-6L

EC9526ANB3R

9526A

LLLLL

LLLLL:Lot No

 

 

 

 

Absolute Maximum Ratings(Vss=0V,Ta=25℃ unless otherwise specified)

 

 

 

Symbol

Rating

Unit

Input voltage between VDD and VSS

VDD

VSS= -0.3 ~ VSS= +12

V

VM pin input voltage

VM

VDD - 15 ~ VDD + 0.3

V

DO pin output voltage

VDO

VSS - 0.3 ~ VDD + 0.3

V

CO pin output voltage

VCO

VDD 15 ~ VDD + 0.3

V

Electrical static discharge

HBM

2

KV

MM

200

V

Operating Temperature Range

TOPR

- 40 ~ + 85

Storage Temperature Range

TSTG

- 55 ~ + 125

 

Remarks: Any operation condition exceeds the absolute maximum ratings will damage the IC.

 

Product Name List

Product

Over charge

Detection

Voltage

[Vdet1]

Over charge

Release

Voltage

[Vrel1]

Over

discharge

Detection

Voltage

[Vdet2]

Over

discharge

Release

Voltage

[Vrel2]

Discharge

overcurrent

Detection

Voltage

[Vdet3]

0V Battery

Charge

Function

Mode

Selection

EC9526ANB3R

4.3V±0.050V

4.1V±0.050V

2.4V±0.100V

3.0V±0.100V

150mV±30mV

Available

Auto- recovery

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Electrical Characteristics (TA = 25 unless otherwise specified)

 

 

DETECTION VOLTAGE

 

 

Electrical Characteristics (TA = 25 unless otherwise specified)

DELAY TIME

 

Pin Configuration

Package

Pin No.

Symbol

Description

1

DO

Over-discharge MOSFET Gate control terminal

2

VM

Input terminal connect to charger and system ground

3

CO

Over-charge MOSFET Gate control terminal

4

NC

No connection

5

VDD

Battery positive terminal

6

VSS

Battery negative terminal

 

 

 

 

 

 

Type Application Circuit

 

Discrete

Components

Function

Min.

Typ.

Max.

Unit

Remarks

R1

Resistor

Current limit noise filtering

--

100

1K

Ω

*1

R2

Resistor

Current limit ESD protection

300

1K

2K

Ω

*4

R3

Thermistor

Temp. protection

--

--

00

kΩ

 

C1

Capacitor

Noise filtering

0.022

0.1

1.0

uF

*3

M1

N-MOSFET

Discharge switch

 

 

 

 

*2

M2

N-MOSFET

Charge switch

 

 

 

 

*2

 

*1R1 is a singlestage RC filterthe higher resistance of R1the better the filtering effectIf the R1 resistance higher than the recommended value,it will affect the internal detection circuit and the voltage detection accuracy will out of specification.We suggest using the recommended resistance in application.

*2The absolute maximum rating of CO and VM is 28V, customer could choose 20V or 30V dual NMOSFET switches for different application.

*3:Add a C1 capacitor between VDD and VSS could filter conduction and radiation noise.

*4:R2 resistor could have a current limit function and limit charger current surge.

 

 

 

 

 

 

 

Normal Operation

The EC9526A monitors the VDD power supply voltage relative to VSS detecting the over-charge and over-discharge conditions. It also monitors the VM voltage to detect the discharge over-current and load short circuiting to protect the battery cell. In normal operation, the VDD should be in the range from the over-charge detection voltage Vdet1 to the

over-discharge voltage Vdet2, and the VM pin voltage is in the range from discharge over-current voltage Vdet3 to charger detection voltage VCHA. In normal condition, the internal pull-up resistor from VM pin to VDD(RVMD)is disconnected and the internal pull-down resistor(RVMS)from VM pin to VSS is also disconnected.

Notice: Discharging may not be enacted when the battery is first time connected. To regain normal status, VM and VSS terminal must be shorted or the charger must be connected.

 

 

Over-Charge Condition

When the battery voltage is greater than over-charge voltage(Vdet1)and have a TVdet1 time duration from a normal operation condition, the over-charge condition hold and the CO pin will output from logic “H” to logic “L” to disconnect the battery charging path. It will turn-off the external MOSFET and the charging status stopped.

It will release the over-charge condition in the following conditions. If the battery voltage less than Vrel1 from the over-charge condition, the CO will output logic “H” to turn on the external MOSFET to resume the charging path. In the over-charge condition, the discharge over-current and load short circuiting function will be disabled until the battery voltage falls below the overcharge detection voltage. It is because that the internal resistance of battery which will trigger the discharge over-current and load short circuiting function in the time when over-charge condition enabled.

In over-charge condition, the internal pull-up resistor from VM pin to VDD(RVMD)is disconnected and the internal pull-down resistor(RVMS)from VM pin to VSS is also disconnected.

 

Over-Discharge Condition

The EC9526A single-cell lithium protect IC monitors the VDD voltage to detect the over-discharge state from normal operation condition. If the VDD voltage becomes lower than the Vdet2 and continues for the over-discharge delay time TVdet2 from normal operation condition, the DO pin will output “L” to disable the external MOSFET and the discharging

stopped.

If a charger is connected and the VDD voltage is greater than over-discharge release voltage Vrel2, the over-discharge condition released. In over-discharge condition, the charging path is connected by the parasitic diode of discharge controlled MOSFET.

When a battery in the over-discharge condition, if VDD is greater than Vrel2 and the VM is higher than VCHA, the over-discharge condition is released. When a battery in the over-discharge condition, if VDD is greater than Vdet2 and the VM is lower than VCHA, the over-discharge condition is released.

When the over-discharge condition hold, and the voltage difference between VM and VDD is less than 1.3V, the current consumption is reduced to the power-down current consumption 0.1uA in typical.

In over-discharge condition, the VM pin is connected to VDD by internal pull-up resistor RVMD and the internal pull-down resistor(RVMS)from VM pin to VSS is disconnected.

When the MOSFET is off, VM pin voltage is pulled up by the resistor to VDD in the IC, at this time, the power consumption is reduced to the lowest. This condition is called the “Green MODE”.

 

Over-current Condition

There are 3 kinds of over-current condition. One is the discharge over-current condition and another is the load short-circuiting condition and the other is charge over-current condition.

The EC9526A monitors the VM pin voltage to detect the over-current and load short-circuiting condition. If VM pin voltage is greater than Vdet3 and continues to discharge over-current delay time TVdet3, the over-current condition enabled and the DO pin output logicL” to disable the discharging path. At the same time, the discharging is stopped.

In over-current condition, the internal pull-up resistor from VM pin to VDD(RVMD)is disconnected and the VM pin is connected to VSS by internal pull-down resistor RVMS. However, the VM pin is pull-up to VDD by external load resistor. When the load is disconnected, the VM pin is pull-down to VSS by internal resistor.

If the VM pin voltage falls below the charger detection voltage VCHA under normal condition,and it continues and longer than the overcharge detection delay time TVdet1, the CO pin will disable the charging path by disconnected the charge controlled MOSFET. The charge over-current detection is released when the voltage difference between VM pin and VSS becomes less than charger detection voltage VCHA.

 

Timing Diagram

1. Over-charge voltage detection/release & Over-discharge voltage detection / release