EUP9261AJVIR1中文资料
DESCRIPTION
The EUP9261 series are lithium-ion/lithium polymer rechargeable battery protection ICs incorporating high-accuracy voltage detection circuit and delay circuit. The EUP9261 series are suitable for protection of single-cell lithium-ion/lithium polymer battery packs from overcharge, overdischarge and overcurrent. FEATURES
z Absolute maximum rating of 30V for the charger connection pins(VM and CO)
z Highly accurate voltage detector………….Overcharge detection (Topt=+25°C) ±25mV
(Topt=-5 to 55°C) ±30mV
Overcharge hysteresis ±25mV
Overdischarge detection ±50mV
Overcurrent 1 detection ±15mV
Overcurrent 2 detection ±100mV
z Variety of detector………………………… Overcharge detection 3.9V-4.4V step of 5mV
Overcharge hysteresis 0.0V-0.4V*1 step of 50mV
Overdischarge detection 2.0V-3.0V step of 10mV
Overdischarge hysteresis 0.0V-0.7V*2 step of 100mV
Overcurrent 1 detection 0.03V-0.3V step of 10mV
Overcurrent 2 detection 0.5V
*1 Overcharge release voltage=Over detection voltage-Overcharge hysteresis voltage
*2 Overdischarge release voltage = Overdischarge detection voltage-Overdischarge hysteresis voltage.
z Delay times internally generated. Accuracy : ±30%.
(overcharge:t CU, overdischarge: t DL, overcurrent 1: t lOV1, overcurrent 2:t lOV2)
z Three-step overcurrent detection circuit is included.(overcurrent 1,overcurrent 2 and load short – circuiting) z Charger detection function and abnormal charge current detection function, included.
z0V-battery charge option: Acceptable/Unacceptable.
z Low current consumption
Operation: 3.0μA typ. 6μA max.
Power-down 0.1μA max.
z DP pin……………………………………...At V SS level, delay circuit is disabled. Tie a 300k? resistor to V SS,
delay time of all items expect short-circuit can be reduced.
z Wide operating temperature range: -40°C to + 85°C.
z Small package: SOT-23-6, STDFN-6(2mm*2mm)
z RoHS compliant and 100% lead (Pb)-free
APPLICATIONS
z Lithium-ion rechargeable battery packs.
z Lithium polymer rechargeable battery packs.
Block Diagram
Figure1.
Pin Configurations
Package Type Pin Configurations
SOT-23-6
STDFN-6
Pin Description
PIN SOT-23-6 STDFN6 DESCRIPTION
DO
1
3
DO FET gate control pin for discharge (CMOS output)
VM 2 2
VM Voltage detection pin between VM and VSS (Overcurrent detection pin) CO 3 1 CO FET gate control pin for charge(CMOS output)
DP
4
6
Pin for reduce output delay time and for delay time measurement
V DD 5 5 V DD Positive power input pin V SS 6 4 V SS Negative power input pin
Absolute Maximum Ratings
Input voltage between V DD and V SS -------------------------------------------------- V SS -0.3 V to V SS +12 V Input pin voltage for VM -------------------------------------------------------------- V DD -30 V to V DD +0.3 V Output pin voltage for CO ------------------------------------------------------------- V VM -0.3 V to V DD +0.3 V Output pin voltage for DO --------------------------------------------------------------- V SS -0.3 V to V DD +0.3 V Power dissipation SOT-23-6 ---------------------------------------------------------------------------- 250mW Operating temperature range --------------------------------------------------------------------- -40°C to +85°C Storage temperature range --------------------------------------------------------------------- -55°C to +125°C ESD Susceptibility
HBM (Human Body Mode) ------------------------------------------------------------------------------- >1KV MM (Machine Mode) --------------------------------------------------------------------------------------- >200V
Ordering Information
Temperature
range Order Number Package Type Marking Operating
EUP9261AJVIR1 SOT-23-6 BJ -40°C to 85°C
EUP9261AJVIR0 SOT-23-6 BJ -40°C to 85°C
EUP9261BJVIR1 SOT-23-6 BT -40°C to 85°C
EUP9261BJVIR0 SOT-23-6 BT -40°C to 85°C
EUP9261BOVIR1 SOT-23-6 BO -40°C to 85°C
EUP9261BOVIR0 SOT-23-6 BO -40°C to 85°C
EUP9261BQVIR1 SOT-23-6 BQ -40°C to 85°C
EUP9261BQVIR0 SOT-23-6 BQ -40°C to 85°C
EUP9261BPVIR1 SOT-23-6 BP -40°C to 85°C
EUP9261BPVIR0 SOT-23-6 BP -40°C to 85°C
EUP9261BBVIR1 SOT-23-6 BB -40°C to 85°C
EUP9261BBVIR0 SOT-23-6 BB -40°C to 85°C
EUP9261BFVIR1 SOT-23-6 BF -40°C to 85°C
EUP9261BFVIR0 SOT-23-6 BF -40°C to 85°C
-40°C to 85°C EUP9261BJSIR1 STDFN-6
B T
EUP9261
Lead Free Code
1:Lead Free 0:Lead
Packing
R: Tape& Reel
Operating temperature range
I: Industry Standard
Package Type
V: SOT-23-6, S: STDFN-6
Model No.
Application Circuit
Figure2.
Symbol Parts
Purpose Recommend min. max. Remarks
FET1 N channel MOSFET
Charge control -- -- --
Threshold voltage ≤ Overdischarge detection voltage *1
Gate to source withstand voltage ≥ Charge voltage*2
FET2
N channel MOSFET
Discharge control -- -- --
Threshold voltage ≤ Overdischarge detection voltage *1
Gate to source withstand voltage ≥ Charge voltage*2
R1 Resistor
ESD protection
For power fluctuation 470? 300? 1k ?
Resistance should be as small as possible to avoid lowering of the
overcharge detection accuracy caused by VDD pin current. *3
C1
Capacitor
For power fluctuation
0.1μF 0.022μF 1.0μF
Install a capacitor of 0.022μF or higher between VDD and VSS. *4
R2 Resistor
Protection for reverse connection of a charger
2k ? 300? 4k ?
Select a resistance as large as possible to prevent current when a charger is reversely connected. *5
*1 If the threshold voltage of an EFT is low, the FET may not cut the charging current.
If an FET with a threshold voltage equal to or higher than the overdischarge detection voltage is used, discharging may be stoped before overdischarge is detected.
*2 If the withstand voltage between the gate and source is lower than the charger voltage, the FET may destroy.
*3 If R1 has a high resistance, the voltage between VDD and VSS may exceed the absolute maximum rating when a charger is
connected reversely since the current flows from the charger to the IC. Insert a resistor of 300? or higher as R1 for ESD protection.
*4 If a capacitor of less than 0.022μF is installed as C1,DO may oscillate when load short-circuiting is detected. Be sure to install a capacitor of 0.022μF or higher as C1.
*5 If R2 has a resistance higher than 4k ?, the charging current may not be cut when a high-voltage charger is connected. Remark The DP pin should be open.
Caution The above connection diagram and constant will not guarantee successful operation. Perform through evaluation
using the actual application to set the constant.
Product name list
Model No. Overcharge
detection
voltage[V CU]
Overcharge
Hysteresis
voltage[V HC]
Overdischarge
detection
voltage [V DL]
Overdischarge
hysteresis
voltage [V HD]
Overcurrent 1
detection
voltage [V IOV1]
0V battery
charge function
EUP9261AJ 4.325 V 0.25V 2.5V 0.4V 0.150V Unavailable
EUP9261BJ 4.28 0.2V 3.0V 0V 0.080V
Available EUP9261BO 4.28 0.2V 2.3V 0V 0.040V
Available EUP9261BQ 4.28 0.2V 2.9V 0.1V 0.030V
Available
EUP9261BP 4.35 0.2V 2.3V 0.7V 0.200V
Available EUP9261BB 4.28 0.3V 2.3V 0.1V 0.125V
Available EUP9261BF 4.28 0.2V 2.8V 0V 0.050V
Available
Model No. Overcharge detection
delay time
Overdischarge detection
delay time
Overcurrent 1 detection
delay time
EUP9261AJ 1.3s 175ms 12ms EUP9261BJ 1.3s 175ms 12ms EUP9261BO 1.3s 175ms12ms
EUP9261BQ 1.3s 175ms12ms
EUP9261BF 1.3s 175ms12ms
EUP9261BP 144ms 40ms 20ms EUP9261BB 144ms 40ms 20ms Note: It is possible to change the detection voltages of the product other than above. The delay times can also be changed within
the range listed bellow. For details, please contact our sales office.
Electrical Characteristics (1) Except detection delay time (25°C)
(Ta=25°C unless otherwise specified)
Symbol Parameter Remark Min Typ Max Unit
Measurement
circuit
Detection Voltage
----- V CU -0.025V CU V CU +0.025 V CU
Overcharge detection voltage V CU =3.9 V to 4.4 V, 5 mV Step Ta = -5°C to 55°C *1
V CU -0.030V CU V CU +0.030 V 1
V HC Overcharge hysteresis voltage V HC =0.0V to 0.4V, 50mV Step ----- V HC -0.025V HC V HC +0.025 V 1 V DL Overdischarge detection voltage V DL =2.0 V to 3.0 V, 10 mV Step ----- V DL -0.050V DL V DL +0.050 V 2 V HD Overdischarge hysteresis voltage V HD =0.0V to 0.7V, 100mV Step ----- V HD -0.050V HD V HD +0.050 V 2 V IOV1
Overcurrent 1 detection voltage V IOV1=0.05V to 0.3V,10mV Step
----- V IOV1 -0.015V IOV1 V IOV1 +0.015 V 2 V IOV2 Overcurrent 2 detection voltage -----
0.4 0.5 0.6 V 2 V SHORT Load short-circuiting detection voltage ----- 0.7 1 1.3 V 2 V CHA Charge detection voltage
----- -1.3
-1.0
-0.7
V
2 Input Voltage, Operation Voltage
V DSOP1
Operation voltage between V DD and
V SS
Internal circuit operating voltage 1.5 -- 8 V --- V DSOP2 Operation voltage between V DD and V M
Internal circuit operating voltage
1.5 -- 28 V
---
Current Consumption
I OPE Current consumption in normal
operation
V DD =3.5 V, V VM =0 V
1.0 3.0 6.0 μA 2 I PDN
Current consumption at power down
V DD =V VM =1.5 V --
--
0.1
μA
2
Output Resistance
R COH CO pin H resistance V CO =3.0V,V DD =3.5V
V VM =0 V 2.5 5 10 k ?
4
R COL CO pin L resistance V CO =0.5 V, V DD = 4.5V,
V VM =0 V
2.5 5 10 k ? 4 R DOH DO pin H resistance V DO =
3.0 V, V DD =3.5V,
V VM =0 V
2.5 5 10 k ? 4 R DOL
DO pin L resistance
V DO =0.5V V DD =V VM
=1.8 V
2.5 5 10 k ? 4
VM Internal Resistance
R VMD Internal resistance between VM and
VDD
V DD =1.8 V, V VM =0 V
100 300 900 k ? 3
R VMS
Internal resistance between VM and
VSS
V DD =3.5 V, V VM =1.0 V
15
35
60
k ?
3
0V battery charging function
V 0CHA 0V battery charge starting charger voltage
0V battery charging
available
1.2 -- -- V 2 V 0INH
0V battery charge inhibition battery voltage
0V battery charging
unavailable
-- -- 0.5 V
2
*1. Since products are not screened at low and high temperature, the specification for this temperature range is guaranteed by
design not tested in production.
Electrical Characteristics (2) Except detection delay time (-40°C to +85°C*1)
(Ta= -40°C to +85°C*1 unless otherwise specified)
Symbol Parameter Remark Min Typ Max Unit
Measurement
circuit
Detection Voltage
V CU Overcharge detection voltage VCU=3.9 V to 4.4 V, 5 mV Step ----- V CU -0.055V CU V CU +0.040 V 1 V HC Overcharge hysteresis voltage V HC =0.0V to 0.4V, 50mV Step ----- V HC -0.030V HC V HC +0.030 V 1 V DL Overdischarge detection voltage V DL =2.0 V to 3.0 V, 10 mV Step ----- V DL -0.080V DL V DL +0.080 V 2 V HD Overdischarge hysteresis voltage V HD =0.0V to 0.7V, 100mV Step ----- V HD -0.050V HD V HD +0.050 V 2 V IOV1
Overcurrent 1 detection voltage V IOV1=0.05V to 0.3V,10mV Step
----- V IOV1 -0.025V IOV1 V IOV1 +0.025 V 2 V IOV2 Overcurrent 2 detection voltage -----
0.37 0.5 0.63 V 2 V SHORT Load short-circuiting detection voltage ----- 0.5 1 1.5 V 2 V CHA Charge detection voltage
----- -1.5
-1.0
-0.5
V
2 Input Voltage, Operation Voltage
V DSOP1
Operation voltage between V DD and
V SS
Internal circuit operating voltage 1.5 -- 8 V --- V DSOP2 Operation voltage between V DD and V M
Internal circuit operating voltage
1.5 -- 28 V
---
Current Consumption
I OPE Current consumption in normal
operation
V DD =3.5 V, V VM = 0 V
0.7 3.0 8.0 μA 2 I PDN
Current consumption at power down
V DD =V, V VM =1.5 V --
--
0.1
μA
2
Output Resistance
R COH CO pin H resistance V CO = 3.0 V, V DD =3.5V, V VM = 0 V 1.2 5 15 k ? 4 R COL CO pin L resistance V CO =0.5 V, V DD =4.5V,
V VM = 0 V 1.2 5 15 k ? 4 R DOH DO pin H resistance V DO =3.0 V, V DD =3.5V,
V VM = 0 V 1.2 5 15 k ? 4 R DOL
DO pin L resistance
V DO =0.5V, V DD =V VM = 1.8V
1.2 5 15 k ?
4
VM internal resistance
R VMD Internal resistance between V M and
V DD
V DD =1.8 V, V VM =0 V 78 300
1310
k ?
3
R VMS
Internal resistance between V M and V SS
V DD =3.5 V, V VM =1.0 V
10
35 70 k ? 3
0V battery charging function
V 0CHA 0V battery charge starting charger voltage 0V battery charging
available 1.7 -- -- V 2 V 0INH
0V battery charge inhibition battery voltage 0V battery charging unavailable
-- -- 0.3 V
2
*1.Since products are not screened at low and high temperature, the specification for this temperature range is guaranteed by design, no tested in production.
Electrical Characteristics (3) Detection delay time
(I) EUP9261 AJ, EUP9261BJ, EUP9261BO, EUP9261BQ, EUP9261BF
(II) EUP9261BB, EUP9261BP
Symbol Parameter Remark Min.Typ.
Max. Unit
Measurement
circuit
Delay time (25°C)
t CU Overcharge detection delay time ----- 0.91 1.3 1.69 s 5 t DL Overdischarge detection delay time ----- 122 175 228 ms 5 t IOV1 Overcurrent 1 detection delay time ----- 8.4 12 15.6 ms 5 t IOV2
Overcurrent 2 detection delay time ----- 2.1 3 3.9 ms 5 t SHORT
Load short-circuiting detection delay
time -----
200
320
500
μs
5
Delay time (-40°C to +85°C) *1
t CU Overcharge detection delay time ----- 0.72 1.3 2.16 s 5
t DL Overdischarge detection delay time ----- 97 175 291 ms 5 t IOV1 Overcurrent 1 detection delay time ----- 6.7 12 20 ms 5 t IOV2 Overcurrent 2 detection delay time ----- 1.5 3 5 ms 5 t SHORT
Load short-circuiting detection delay time
----- 150 320 600 μs 5
Symbol Parameter Remark Min.Typ.
Max. Unit
Measurement
circuit
Delay time (25°C)
t CU Overcharge detection delay time ----- 100 144 187 ms 5 t DL Overdischarge detection delay time ----- 28 40 52 ms 5 t IOV1 Overcurrent 1 detection delay time ----- 14 20 26 ms 5 t IOV2 Overcurrent 2 detection delay time ----- 2.1 3 3.9 ms 5 t SHORT
Load short-circuiting detection delay time
-----
200
320
500
μs
5
Delay time (-40°C to +85°C) *1
t CU Overcharge detection delay time ----- 80 144 240 ms 5 t DL Overdischarge detection delay time ----- 22.2 40 66.6 ms 5 t IOV1 Overcurrent 1 detection delay time ----- 11 20 33 ms 5 t IOV2 Overcurrent 2 detection delay time ----- 1.5 3 5 ms 5 t SHORT
Load short-circuiting detection delay time
----- 150 320 600 μs 5
Measurement Circuits
Unless otherwise specified, the output voltage levels “H” and “L” at CO and DO pins are judged by the threshold voltage (1.0 V) of the N channel FET. Judge the CO pin level with respect to V VM and the DO pin level with respect to V SS.
(1) Measurement Condition 1, Measurement Circuit 1
The overcharge detection voltage (V CU) is defined by the voltage between VDD and VSS at which V CO goes “L” from “H” when the voltage V1 is gradually increased from
the starting condition V1
=3.5V. The overcharge
hysteresis voltage (V HC) is then defined by the difference between the overcharge detection voltage (V CU) and the voltage between VDD and VSS at which V CO goes “H” from “L” when the voltage V1 is gradually decreased.
(2) Measurement Condition 2, Measurement Circuit 2
The overdischarge detection voltage (V DL) is defined by the voltage between VDD and VSS at which V DO goes “L” from “H” when the voltage V1 is gradually decreased from the starting condition V1=3.5V and V2 =0V. The overdischarge hysteresis voltage (V HD) is then defined by the difference between the overdischarge detection voltage (V DL) and the voltage between VDD and VSS at which V DO goes “H” from “L” when the voltage V1 is gradually increased.
(3) Measurement Condition 3, Measurement Circuit 2
The overcurrent 1 detection voltage (V IOV1) is defined by the voltage between VM and VSS at which V DO goes ”L” from “H” when the voltage V2 is gradually increased from the normal condition V1 =3.5V and V2 =0V.
The overcurrent 2 detection voltage (V IOV2) is defined by the voltage between VM and VSS at which V DO goes “L” from “H” when the voltage V2 is increased at the speed between 1ms and and 4ms from the normal condition V1=3.5V and V2 = 0V.
The load short-circuiting detection voltage (V SHORT) is defined by the voltage between VDD and VSS at which V DO goes “L” from “H” when the voltage V2 is increased
at the speed between 1μs and 50μs from the normal condition V1=3.5V and V2=0V. (4) Measurement Condition 4, Measurement Circuit 2
Set V1=1.8V and V2=0V. Increase V1 gradually until V1=V DL+(V HD/2) , then decrease V2 from 0V gradually. The voltage between VM and VSS when V DO goes “H” from “L” is the charger detection voltage (V CHA). Charger detection voltage can be measured only in the product whose overdischarge hysteresis V HD≠ 0.
Set V1=3.5V and V2=0V. Decrease V2 from 0V gradually. The voltage between VM and VSS when V CO goes “L” from “H” is the abnormal charge current detection voltage. The abnormal charge current detection voltage has the same value as the charger detection voltage (V CHA). (5) Measurement Condition 5, Measurement Circuit 2
Set V1=3.5V and V2=0V under normal condition. The current I DD flowing through VDD pin is the normal operation consumption current (I OPE). Set V1=V2=1.5V under overdischarge condition. The current I DD flowing through VDD pin is the power-down current consumption
(I PDN).
(6) Measurement Condition 6, Measurement Circuit 3
< Internal resistance between VM and VDD, Internal resistance between VM and VSS. >
Set V1=1.8V and V2=0V. The resistance between VM and VDD is the internal resistance (R VMD) between VM and VDD. Set V1=3.5V and V2=1.0V. The resistance between VM and VSS is the internal resistance (R VMS) between VM and VSS.
(7) Measurement Condition 7, Measurement Circuit 4
Set V1=3.5V, V2=0V and V3=3.0V. CO pin resistance is the CO pin H resistance (R COH). Set V1=4.5V, V2=0V and V3=0.5V. CO pin resistance is the CO pin L resistance (R COL).
(8) Measurement Condition 8, Measurement Circuit 4
Set V1=3.5V, V2=0V and V4=3.0V. DO pin resistance is the DO pin H resistance (R DOH).Set V1=1.8V,V2= 0V and V4=0.5V. DO pin resistance is the DO pin L resistance (R DOL).
(9) Measurement Condition 9, Measurement Circuit 5
The overcharge detection delay time (t CU) is the time needed for V CO to change from “H” to “L” just after the V1 rapid increase within 10 μs from the overcharge detection voltage (V CU) - 0.2V to the overcharge detection voltage (V CU) + 0.2V in the condition V2=0V. The overdischarge detection delay time (t DL) is the time needed for V DO to change from “H” to “L” just after the V1 rapid decrease within 10μs from the overdischarge detection voltage (V DL)+0.2V to the overdischarge detection voltage (V DL) .
0.2V in the condition V2=0V.
(10) Measurement Condition 10, Measurement Circuit 5
Set V1=3.5V and V2=0V. Increase V2 from 0V to 0.35 V momentarily (within 10μs). The time needed for V DO to go “L” is overcurrent 1 detection delay time (t IOV1).Set V1=3.5V and V2=0V. Increase V2 from 0V to 0.7V momentarily (within10μs). The time needed for V DO to go “L” is overcurrent 2 detection delay time (t IOV2). Set V1=3.5V and V2=0V. Increase V2from 0V to 1.6V momentarily (within10μs). The time needed for V DO to go “L” is the load short-circuiting detection delay time (t SHORT).
Set V1=3.5V and V2=0V. Decrease V2 from 0V to 1.1V momentarily (within10μs). The time needed for V CO to go “L” is the abnormal charge current detection delay time. The abnormal charge current detection delay time has the same value as the overcharge detection delay time. (11) Measurement Condition 11, Measurement Circuit 2 (Product with 0V battery charge function)
<0V battery charge starting charge voltage>
Set V1=V2=0V and decrease V2 gradually. The voltage between VDD and VM when V CO goes ”H” (V VM+0.1V or higher) is the 0V battery charge starting charger voltage
(V0CHA).
(12) Measurement Condition 12, Measurement Circuit 2 (Product with 0V battery charge inhibition function)
<0V battery charge inhibition battery voltage>
Set V1=0V and V2=4V. Increase V1 gradually. The voltage between VDD and VM when V CO goes ”H” (V VM+0.1V or higher) is the 0V battery charge inhibition battery voltage
(V0INH).
Measurement Circuit
Measurement Circuit 1 Measurement Circuit 2
Measurement Circuit 3 Measurement Circuit 4
Measurement Circuit 5
Characteristics
1. Detection/release voltage temperature characteristics
Figure3. Figure4.
Figure5. Figure6.
Figure7. Figure8.
Figure9.
2. Current consumption temperature characteristics
Figure10. Figure11.
3. Detection/release delay time temperature characteristics
Figure12. Figure13.
Figure14. Figure15.
Figure16.
Description of Operation
Normal condition
The EUP9261 monitors the voltage of the battery connected between VDD and VSS pin and the voltage difference between VM and VSS pin to control charging and discharging. When the battery voltage is in the range from the overdischarge detection voltage (V DL) to the overcharge detection voltage (V CU), and the VM pin voltage is in the range from the charger detection voltage (V CHA) to the overcurrent 1 detection voltage (V IOV1), the IC turns both the charging and discharging control FETs on. This condition is called the normal condition, and in this condition charging and discharging can be carried out freely.
Note: When a battery is connected to the IC for the first time, the battery may not enter dischargeable state. In this case, set the VM pin voltage equal to the VSS voltage or connect a charger to enter the normal condition.
Overcurrent condition (Detection of Overcurrent 1, Overcurrent 2 and Load short-circuiting)
When the condition in which VM pin voltage is equal to or higher than the overcurrent detection voltage, condition that caused by the excess of discharging current over a specified value, continues longer than the overcharge detection delay time in a battery under the normal condition, the EUP9261 turns the discharging control FET off to stop discharging. This condition is called the overcurrent condition. Though the VM and VSS pins are shorted by the R VMS resistor in the IC under the overcurrent condition, the VM pin voltage is pulled to the VDD level by the load as long as the load is connected. The VM pin voltage returns to VSS level when the load is released. The overcurrent condition returns to the normal condition when the impedance between the EB+ and EB- pin (see Figure 2) becomes higher than the automatic recoverable impedance, and the IC detects that the VM pin potential is lower than the overcurrent 1 detection voltage (V IOV1).
Note: The automatic recoverable impedance changes depending on the battery voltage and overcurrent 1 detection voltage settings. Overcharge condition
When the battery voltage becomes higher than the overcharge detection voltage (V CU) during charging under the normal condition and the detection continues for the overcharge detection delay time (t CU) or longer, the EUP9261 turns the charging control FET off to stop charging. This condition is called the overcharge condition. The overcharge condition is released by the following two cases ((1) and (2)):
(1) When the battery voltage falls below the overcharge release voltage, which is equal to the overcharge detection voltage (V CU) overcharge detection hysteresis voltage (V HC), the EUP9261 turns the charging control FET on and turns to the normal condition.
(2) When a load is connected and discharging starts, the EUP9261 turns the charging control FET on and returns to the normal condition. Just after the load is connected and discharging starts, the discharging current flows through the parasitic diode in the charging control FET. At this moment the VM pin potential becomes V f -volt, the voltage for the parasitic diode, higher than VSS level. When the battery voltage goes under the overcharge detection voltage (V CU) and provided that the VM pin voltage is higher than the overcurrent 1 detection voltage, the EUP9261 releases the overcharge condition.
Note1:
If the battery is charged to a voltage higher than the overcharge detection voltage (V CU) and the battery voltage does not fall below the overcharge detection voltage (V CU) even when a heavy load is connected, the detection of overcurrent 1, overcurrent 2 and load short-circuiting does not work. Since an actual battery has the internal impedance of several dozens of m?, the battery voltage drops immediately after a heavy load which causes overcurrent is connected, and the detection of overcurrent 1, overcurrent 2 and load short-circuiting then works.
Note2:
When a charger is connected after the overcharge detection, the overcharge condition is not released even if the battery voltage is below the overcharge release voltage (V CL (?Vcu V HC)). The overcharge condition is released when the VM pin voltage goes over the charger detection voltage (V CHA) by removing the charger.
Overdischarge condition
When the battery voltage falls below the overdischarge detection voltage (V DL) during discharging under the normal condition and the detection continues for the overdischarge detection delay time (t DL) or longer, the EUP9261 turns the discharging control FET off to stop discharging. This condition is called the overdischarge condition. When the discharging control FET turns off, the VM pin voltage is pulled up by the R VMD resistor between VM and VDD in the IC. The voltage difference between VM and VDD then falls bellow1.3V (typ.), the current consumption is reduced to the power-down current consumption (I PDN). This condition is called the power-down condition. The power-down condition is released when a charger is connected and the voltage difference between VM and VDD becomes 1.3V (typ.) or higher. Moreover when the battery voltage becomes the overdischarge detection voltage (V DL) or higher, the EUP9261 turns the discharging FET on and returns to the normal condition.
Charger detection
When a battery in the overdischarge condition is connected to a charger and provided that the VM pin voltage is lower than the charger detection voltage (V CHA), the EUP9261 releases the overdischarge condition and turns the discharging control FET on as the battery voltage becomes equal to or higher than the overdischarge detection voltage (V DL) since the charger detection function works. This action is called charger detection. When a battery in the overdischarge condition is connected to a charger and provided that the VM pin voltage is not lower than the charger detection voltage (V CHA), the EUP9261 releases the Overdischarge condition when the battery voltage reaches the overdischarge detection voltage (V DL) overdischarge hysteresis (V HD) or higher.
Abnormal charge current detection
If the VM pin voltage falls below the charger detection voltage (V CHA) during charging under normal condition and it continues for the overcharge detection delay time (t CU) or longer, the charging control. FET turns off and charging stops. This action is called the abnormal charge current detection. Abnormal charge current detection works when the DO pin voltage is “H” and the VM pin voltage falls below the charger detection voltage (V CHA). Consequently, if an abnormal charge current flows to an over-discharged battery, the EUP9261 turns the charging control FET off and stops charging after the battery voltage becomes higher than the overdischarge detection voltage which make the DO pin voltage “H”, and still after the overcharge detection delay time (t CU) elapses. Abnormal charge current detection is released when the voltage difference between VM pin and VSS pin becomes less than charger detection voltage (V CHA).
Delay circuits
The detection delay times are generated by dividing the approximate 3.5 KHz clock with a counter.
Note1:
The detection delay time for overcurrent 2 and load short-circuiting start when the overcurrent 1 is detected. As soon as the overcurrent 2 or load short-circuiting is detected over the detection delay time for overcurrent 2 or load short-circuiting after the detection of Overcurrent 1, the EUP9261 turns the discharging control FET off.
Figure17.
Note2:
When the overcurrent is detected and it continues for longer than the Overdischarge detection delay time without releasing the load, the load, the condition changes to the power-down condition when the battery voltage falls below the Overdischarge detection voltage.
Note3:
When the battery voltage falls below the Overdischarge detection voltage due to the overcurrent, the EUP9261 turns the discharging control FET off by the overcurrent detection. And in this case the recovery of the battery voltage is so slow that the battery voltage after the Overdischarge detection delay time is still lower than the Overdischarge detection voltage, the EUP9261 transits to the power-down condition.
DP pin
The DP pin is a test pin for delay time measurement and for output delay time reduction or bypass. It should be open or VDD level in the actual application.
For reducing delay time, connect this pin with a 300k?resistor to VSS. An internal clock can be measured. Under this condition, output delay time of over-charge, over-discharge, over-current1 and over-current2 can be shorter than the setting value (delay time for over charge becomes about 1/64 of normal state).
By forcing this pin to VSS, output delay time circuit can be disabled.
0V battery charge function*1*2
This function is used to recharge the connected battery whose voltage is 0V due to the self-discharge.
When the 0V battery charge starting charge voltage (V0CHA) or higher is applied between EB+ pin and EB-pin by connecting a charger, the charging control FET gate is fixed to VDD pin voltage. When the voltage between the gate and source of the charging control FET becomes equal to or higher than the turn-on voltage e by the charger voltage, the charging control FET turns on to start charging. At this time, the discharging control FET is off and the charging current flows through the internal parasitic diode in the discharging control FET. When the battery voltage becomes equal to or higher than the overdischarge release voltage (VDU), the EUP9261 enters the normal condition. 0V battery charge inhibition function*1
This function inhibits the recharging when a battery which is short-circuited (0V) internally is connected. When the battery voltage is 0.6V (typ.) or lower, the charging control FET gate is fixed to EB- pin voltage to inhibit charging. When the battery voltage is the 0V battery charge inhibition battery voltage (V0INH) or higher, charging can be performed.
*1.Some battery providers do not recommend charging for completely self-discharged battery.
Please ask battery providers before determining
the 0V battery charge function.
*2.The 0V battery charge function has higher priority than the abnormal charge current detection function. Consequently, a product with the 0V
battery charge function charges a battery forcedly
and abnormal charge current cannot be detected
when the battery voltage is low.
Operation Timing Chart
1. Overcharge and Overdischarge Detection
Figure18.
2. Overcurrent Detection
Figure19.
Note: (1) Normal condition. (2) Overcharge condition. (3) Overdischarge condition. (4) Overcurrent condition The charger is supposed to charge with constant current