R5460N201AC-TR-F [RICOH]
Power Management Circuit;
| 型号： | R5460N201AC-TR-F |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | Power Management Circuit |
| 文件： | 总29页 (文件大小：574K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
R5460_E2/2007/05/25
Li-ION/POLYMER 2-CELL PROTECTOR
R5460xxxxxx SERIES
EA-165-070525
OUTLINE
The R5460xxxxxx Series are high voltage CMOS-based protection ICs for over-charge/discharge of
rechargeable two-cell Lithium-ion (Li+) / Lithium polymer, further include a short circuit protection
circuit for preventing large external short circuit current and the protection circuits against the excess
discharge-current and excess charge current.
Each of these ICs is composed of six voltage detectors, a reference unit, a delay circuit, a short
circuit protector, an oscillator, a counter, and a logic circuit. When the over-charge voltage threshold or
excess-charge current threshold crosses the each detector threshold from a low value to a high value,
the output of COUT pin switches to “L” level after internal fixed delay time. To release over-charge de-
tector after detecting over-charge, the detector can be reset and the output of COUT becomes "H" when a
kind of load is connected to VDD after a charger is disconnected from the battery pack and the cell
voltage becomes lower than over-charge detector threshold. In case that a charger is continuously
connected to the battery pack, if the cell voltage becomes lower than the over-charge detector threshold,
over-charge state is also released.
The output of DOUT pin, the output of the over-discharge detector and the excess discharge-current
detector, switches to “L” level after internally fixed delay time, when discharged voltage crosses the
detector threshold from a high value to a value lower than VDET2.
To release over-discharge detector, after detecting over-discharge voltage, connect a charger to the
battery pack, and when the battery supply voltage becomes higher than over-discharge detector
threshold. In case of "A" version, when the cell voltage becomes equal or more than the released voltage
from over-discharge, over-discharge detector is released.
Even if a battery is discharged to 0V, charge current is acceptable.
After detecting excess-discharge current or short current, when the load is disconnected, the excess
discharged or short condition is released and DOUT becomes “H”.
After detecting over-discharge voltage, supply current will be kept extremely low by halting internal
circuits' operation.
When the output of COUT is “H”, if V- pin level is set at -1.6V, the delay time of detector can be
shortened. Especially, the delay time of the over-charge detector can be reduced into approximately
1/60 and test time for protection circuit PCB can be reduced. The output type of COUT and DOUT is
CMOS.
1
R5460xxxxxx
FEATURES
•
Manufactured with High Voltage Tolerant Process... Absolute Maximum Rating
30V
• Low supply current................................. Supply current (At normal mode)
Typ. 4.0µA
Standby current
Typ. 1.2µA (A/D version)
Max. 0.1µA (B/C version)
• High accuracy detector threshold ............ Over-charge detector (Topt=25°C)
(Topt=-5 to 55°C)
±25mV
±30mV
±2.5%
Over-discharge detector
Excess discharge-current detector
Excess charge-current detector
±15mV
±40mV
• Variety of detector threshold
Over-charge detector threshold (A/B/C version)
4.1V-4.5V step of 0.005V(VD1U/VD1L)
3.5V-4.0V step of 0.005V(VD1U/VD1L)
2.0V-3.0V step of 0.005V(VD2U/VD2L)
0.05V-0.20V step of 0.005V
Over-charge detector threshold (D version)
Over-discharge detector threshold
Excess discharge-current threshold
3 options of Excess charge-current threshold (1) -0.4V ±40mV
..................................................................... (2) -0.2V ±30mV
......................................................................(3) -0.1V ±30mV
Over-charge released voltage 0.1V-0.4V step of 0.05V(VH1U/VH1L)
Over-discharge released voltage 0.2V-0.7V step of 0.1V(VH2U/VH2L)
• Internal fixed Output delay time.............. Over-charge detector Output Delay 1.0
s
Over-discharge detector Output Delay
128ms
Excess discharge-current detector Output Delay
Excess charge-current detector Output Delay
12ms
8ms
Short Circuit detector Output Delay
300µs
• Output Delay Time Shortening Function. At COUT is “H”, if V- level is set at –1.6V, the Output
Delay time of detect and release the over-charge and
over-discharge can be reduced. (Delay Time for
over-charge becomes about 1/60 of normal state.)
• 0V-battery charge ................................... acceptable
• Ultra Small package................................ SOT-23-6, PLP1820-6
APPLICATIONS
• Li+ / Li Polymer protector of over-charge, over-discharge, excess-current for battery pack
• High precision protectors for cell-phones and any other gadgets using on board Li+ / Li Polymer
battery
2
R5460xxxxxx
BLOCK DIAGRAMS
A/D version
VDD
DS Circuit
VD1U
Ｏscillator
Counter
Level
Shift
Logic
Circuit
Short
Delay
Detector
VD2U
Vc
VD4
VD3
VD1L
Logic
Circuit
VD2L
DOUT
COUT
V-
VSS
B/C version
VDD
DS Circuit
VD1U
Ｏscillator
Counter
Level
Shift
Logic
Circuit
Short
Detector
Delay
VD2U
Vc
VD4
VD3
VD1L
Logic
Circuit
VD2L
DOUT
COUT
V-
VSS
3
R5460xxxxxx
SELECTION GUIDE
In the R5460xxxxxx Series, input threshold of over-charge, over-discharge, excess discharge current,
and the package and taping can be designated.
Part Number is designated as follows:
R5460x xxxxx-xx
↑ ↑ ↑↑ ↑
←Part Number
a b cd e
Code
Contents
a
Package Type N: SOT-23-6 K: PLP1820-6
Serial Number for the R5460 Series designating input threshold for over-charge,
over-discharge, excess discharge-current detectors.
b
c
d
e
Designation of Output delay option of over-charge and excess discharge-current.
Designation of version symbols.
Taping Type: TR (refer to Taping Specification)
PIN CONFIGURATIONS
SOT-23-6
PLP1820-6
6
5
mark side
2
4
4
3
6
1
5
mark side
2
3
1
4
R5460xxxxxx
PIN DESCRIPTION
Pin No.
Symbol
Description
SOT23-6 PLP1820-6
3
1
2
6
5
4
1
2
3
4
5
6
DOUT
COUT
V-
Output pin of over-discharge detection, CMOS output
Output pin of over-charge detection, CMOS output
Pin for charger negative input
VC
Input Pin of the center voltage between two-cell
Power supply pin, the substrate voltage level of the IC.
Vss pin. Ground pin for the IC
VDD
VSS
ABSOLUTE MAXIMUM RATINGS
Symbol
Item
Ratings
-0.3 to 12
Unit
VDD
Supply voltage
Input Voltage
V
Vc
V-
Center pin voltage between two-cell VSS -0.3 to VDD+0.3
V
Charger negative input V- pin
VDD -30 to VDD+0.3
Output voltage
COUT pin
VCOUT
VDOUT
VDD -30 to VDD +0.3
VSS -0.3 to VDD +0.3
V
V
DOUT pin
PD
Power dissipation
150
mW
°C
Topt
Tstg
Operating temperature range
Storage temperature range
-40 to 85
-55 to 125
°C
5
R5460xxxxxx
ELECTRICAL CHARACTERISTICS
R5460X2XXAA version
Unless otherwise specified, Topt=25°C
Unit
Symbol
Item
Conditions
Voltage defined as
VDD-VSS
Min.
1.5
Typ.
Max.
10.0
VDD1
Operating input voltage
V
V
Voltage defined as VDD-V-
Minimum operating Voltage for
0V charging *Note 1
Vst
1.8
VDD-VSS=0V
Detect rising edge of supply voltage
R1=330Ω
VDET1U
VDET1U
VREL1U
V
V
V
V
DET1U-0.025
V
DET1U+0.025
VDET1U CELL1 Over-charge threshold
R1=330Ω (Topt=-5 to 55°C)*Note3
VDET1U-0.030
VDET1U+0.030
VREL1U-0.050
0.7
11
V
REL1U+0.050
VREL1U CELL1 Over-charge released voltage
R1=330Ω
tVDET1
VDD=3.5V to 4.5V,VC-VSS=3.5V
Output delay of over-charge
1.0
16
1.3
21
s
tVREL1 Output delay of release from over-charge VDD=4.5V to 3.5V, VC-VSS=3.5V
ms
Detect rising edge of supply voltage
VDET1L
VDET1L
VREL1L
V
V
V
VDET1L CELL2 Over-charge detector threshold
VREL1L CELL2 Over-charge released voltage
R1=330Ω
R1=330Ω (Topt=-5 to 55°C)*Note3
R1=330Ω
V
DET1L-0.025
V
DET1L+0.025
VDET1L-0.030
VDET1L+0.030
VREL1L-0.05
VREL1L+0.05
Detect falling edge of supply voltage
CELL1 Over-discharge threshold
CELL1 Released Voltage from
Over-discharge
VDET2U
×
0.975
VDET2U
×
1.025
VDET2U
VREL2U
VDET2U
VREL2U
V
Detect rising edge of supply voltage
VREL2U
89
×
0.975
VREL2U
×
1.025
V
VDD-VC=3.5V to 2.2V
VC-VSS=3.5V
VDD-VC=2.2V to 3.5V,
VC-VSS=3.5V
tVDET2 Output delay of over-discharge
128
167
1.7
ms
Output delay of release from over-discharge
tVREL2
0.7
1.2
ms
V
Detect falling edge of supply voltage
CELL2 Over-discharge threshold
CELL2 Released Voltage from
Over-discharge
Excess discharge-current threshold
Output delay of excess discharge cur-
rent
VDET2L
VREL2L
×
0.975
VDET2L
VREL2L
×
1.025
VDET2L
VREL2L
VDET2L
VREL2L
VDET3
12
Detect rising edge of supply voltage
×
0.975
×
1.025
V
Detect rising edge of 'V-' pin voltage VDET3-0.015
VDET3+0.015
VDET3
V
VDD-VC=VC-VSS=3.5V, V-=0V to 0.5V
tVDET3
8
16
ms
Output delay of release from
excess discharge-current
VDD-VC=VC-Vss=3.5V, V-=3V
to 0V
tVREL3
VDET4
0.7
1.2
1.7
ms
V
-0.44
-0.23
-0.13
-0.40 -0.36
-0.20 -0.17
-0.10 -0.07
Detect falling edge of 'V-' pin voltage
Excess charge-current threshold
Output delay of excess charge-current
V
DD-VC=VC-VSS=3.5V, V-=0V to
tVDET4
5
8
11
ms
-1V
Output delay of release from excess VDD-VC=VC-VSS=3.5V, V-=-1V
tVREL4
0.7
0.6
230
1.2
1.0
300
1.7
1.4
500
ms
V
charge-current
to 0V
Vshort
Short protection voltage
VDD-VC=VC-VSS=3.5V
VDD-VC=VC-VSS=3.5V, V-=0V to
7V
tshort Output Delay of Short protection
µs
Rshort
Reset resistance for Excess
discharge-current protection
Delay Shortening Mode input
voltage
VDD=7.2V, V-=1V
25
40
75
kΩ
V
VDD-VC=VC-VSS=4.4V
-1.6
VDS
-2.2
-1.0
0.5
Iol=50µA
VDD-VC=VC-VSS=4.5V
Ioh=-50µA
VDD-VC=VC-VSS=3.9V
Iol=50µA
VDD-VC=VC-Vss=2.0V
Ioh=-50µA,
VDD-VC=VC-VSS=3.9V
VDD-VC=VC-VSS=3.9V
VDD-VC=VC-VSS=2V
VOL1
VOH1
VOL2
VOH2
Nch ON voltage of COUT
Pch ON voltage of COUT
Nch ON voltage of DOUT
Pch ON voltage of DOUT
0.4
7.4
0.2
V
6.8
6.8
V
0.5
V
7.4
4.0
V
IDD
IS
Supply current
Standby current
8.0
2.0
µA
µA
1.2
*Note: We compensate for this characteristic related to temperature by laser-trim, however, this specification is guaranteed by design, not
production tested.
6
R5460xxxxxx
R5460X2XXAB/AC version
Unless otherwise specified, Topt=25°C
Unit
Symbol
Item
Conditions
Voltage defined as
VDD-VSS
Min.
1.50
Typ.
Max.
10.0
VDD1
Operating input voltage
V
V
Voltage defined as VDD-V-
Minimum operating Voltage for
0V charging *Note 1
Vst
1.8
VDD-VSS=0V
Detect rising edge of supply voltage
R1=330Ω
VDET1U
VDET1U
VREL1U
V
V
V
V
DET1U-0.025
V
DET1U+0.025
VDET1U CELL1 Over-charge threshold
R1=330Ω (Topt=-5 to 55°C)*Note3
VDET1U-0.030
VDET1U+0.030
VREL1U CELL1 Over-charge released voltage
VREL1U-0.05
0.7
11
VREL1U+0.05
R1=330Ω
tVDET1
VDD=3.5V to 4.5V,VC-VSS=3.5V
Output delay of over-charge
1.0
16
1.3
21
s
tVREL1 Output delay of release from over-charge VDD=4.5V to 3.5V, VC-VSS=3.5V
ms
Detect rising edge of supply voltage
VDET1L
VDET1L
V
V
V
VDET1L CELL2 Over-charge detector threshold
VREL1L CELL2 Over-charge released voltage
R1=330Ω
R1=330Ω (Topt=-5 to 55°C)*Note3
R1=330Ω
V
DET1L-0.025
V
DET1L+0.025
VDET1L-0.030
VDET1L+0.030
VREL1L-0.050
VREL1L VREL1L+0.050
Detect falling edge of supply voltage
CELL1 Over-discharge threshold
VDET2U
×0.975
VDET2U
×1.025
VDET2U
VDET2U
V
VDD-VC=3.5V to 2.2V
VC-VSS=3.5V
VDD-VC=2.2V to 3.5V
VC-VSS=3.5V
tVDET2 Output delay of over-discharge
89
128
167
1.7
ms
Output delay of release from over-discharge
tVREL2
0.7
1.2
ms
Detect falling edge of supply voltage
CELL2 Over-discharge threshold
VDET2L
×0.975
VDET2L×
1.025
VDET2L
VDET3
VDET2L
VDET3
V
V
Excess discharge-current threshold
Output delay of excess discharge
current
Output delay of release from
excess discharge-current
Detect rising edge of 'V-' pin voltage VDET3-0.015
VDET3+0.015
V
DD-VC=VC-VSS=3.5V, V-=0V to
tVDET3
tVREL3
8
12
16
ms
ms
0.5V
VDD-VC=VC-Vss=3.5V, V-=3V
to 0V
0.7
1.2
1.7
-0.44
-0.23
-0.13
-0.40 -0.36
-0.20 -0.17
-0.10 -0.07
Detect falling edge of 'V-' pin voltage
Excess charge-current threshold
Output delay of excess charge-current
VDET4
V
V
DD-VC=VC-VSS=3.5V, V-=0V to
tVDET4
5
8
11
ms
-1V
Output delay of release from excess VDD-VC=VC-VSS=3.5V, V-=-1V
tVREL4
0.7
0.6
230
1.2
1.0
300
1.7
1.4
500
ms
V
charge-current
to 0V
Vshort
Short protection voltage
VDD-VC=VC-VSS=3.5V
VDD-VC=VC-VSS=3.5V, V-=0V
to 7V
tshort Output Delay of Short protection
µs
Rshort
Reset resistance for Excess
discharge-current protection
Delay Shortening Mode input
voltage
VDD=7.2V, V-=1V
25
40
75
kΩ
V
VDD-VC=VC-VSS=4.4V
-1.6
VDS
-2.2
-1.0
0.5
Iol=50µA
VDD-VC=VC-VSS=4.5V
Ioh=-50µA
VDD-VC=VC-VSS=3.9V
Iol=50µA
VDD-VC=VC-Vss=2.0V
Ioh=-50µA,
VDD-VC=VC-VSS=3.9V
VDD-VC=VC-VSS=3.9V
VDD-VC=VC-VSS=2V
VOL1
VOH1
VOL2
VOH2
Nch ON voltage of COUT
Pch ON voltage of COUT
Nch ON voltage of DOUT
Pch ON voltage of DOUT
0.4
7.4
0.2
V
6.8
6.8
V
0.5
V
7.4
4.0
V
IDD
IS
Supply current
Standby current
8.0
0.1
µA
µA
*Note: We compensate for this characteristic related to temperature by laser-trim, however, this specification is guaranteed by design, not
production tested.
7
R5460xxxxxx
R5460X2XXAD version
Unless otherwise specified, Topt=25°C
Unit
Symbol
Item
Conditions
Voltage defined as
VDD-VSS
Min.
1.50
Typ.
Max.
10.0
VDD1
Operating input voltage
V
Voltage defined as VDD-V-
Minimum operating Voltage for
0V charging *Note 1
Vst
1.8
V
VDD-VSS=0V
Detect rising edge of supply voltage
R1=330Ω
VDET1U
VDET1U
VREL1U
V
V
V
V
DET1U-0.025
V
DET1U+0.025
VDET1U CELL1 Over-charge threshold
R1=330Ω (Topt=-5 to 55°C)*Note3
VDET1U-0.030
VDET1U+0.030
VREL1U CELL1 Over-charge released voltage
VREL1U-0.05
0.7
11
VREL1U+0.05
R1=330Ω
tVDET1
VDD=3.2V to 4.5V,VC-VSS=3.2V
Output delay of over-charge
1.0
16
1.3
21
s
ms
tVREL1 Output delay of release from over-charge VDD=4.5V to 3.2V, VC-VSS=3.2V
Detect rising edge of supply voltage
VDET1L
VDET1L
V
V
V
VDET1L CELL2 Over-charge detector threshold
VREL1L CELL2 Over-charge released voltage
R1=330Ω
R1=330Ω (Topt=-5 to 55°C)*Note3
R1=330Ω
V
DET1L-0.025
V
DET1L+0.025
VDET1L-0.030
VDET1L+0.030
VREL1L-0.050
VREL1L VREL1L+0.050
Detect falling edge of supply voltage
CELL1 Over-discharge threshold
CELL1 Released Voltage from
Over-discharge
VDET2U
×
0.975
VDET2U
×
1.025
VDET2U
VREL2U
VDET2U
VREL2U
V
Detect rising edge of supply voltage
VREL2U
89
×
0.975
VREL2U
×
1.025
V
VDD-VC=3.2V to 2.2V
VC-VSS=3.2V
VDD-VC=2.2V to 3.2V
VC-VSS=3.2V
tVDET2 Output delay of over-discharge
128
1.2
167
1.7
ms
Output delay of release from over-discharge
tVREL2
0.7
ms
V
Detect falling edge of supply voltage
CELL2 Over-discharge threshold
CELL2 Released Voltage from
Over-discharge
Excess discharge-current threshold
Output delay of excess discharge
current
VDET2L
VREL2L
×
0.975
VDET2L
VREL2L
×
1.025
VDET2L
VREL2L
VDET2L
VREL2L
VDET3
Detect rising edge of supply voltage
×
0.975
×
1.025
V
Detect rising edge of 'V-' pin voltage VDET3-0.015
VDET3+0.015
VDET3
V
V
DD-VC=VC-VSS=3.2V, V-=0V to
tVDET3
8
12
16
ms
0.5V
Output delay of release from
excess discharge-current
VDD-VC=VC-Vss=3.2V, V-=3V
to 0V
tVREL3
VDET4
0.7
1.2
1.7
ms
V
-0.44
-0.23
-0.13
-0.40 -0.36
-0.20 -0.17
-0.10 -0.07
Detect falling edge of 'V-' pin voltage
Excess charge-current threshold
Output delay of excess charge-current
V
DD-VC=VC-VSS=3.2V, V-=0V to
tVDET4
5
8
11
ms
-1V
Output delay of release from excess VDD-VC=VC-VSS=3.2V, V-=-1V
tVREL4
0.7
0.6
230
1.2
1.0
300
1.7
1.4
500
ms
V
charge-current
to 0V
Vshort
Short protection voltage
VDD-VC=VC-VSS=3.2V
VDD-VC=VC-VSS=3.2V, V-=0V
to 7V
tshort Output Delay of Short protection
µs
Rshort
Reset resistance for Excess
discharge-current protection
Delay Shortening Mode input
voltage
VDD=6.4V, V-=1V
25
40
75
kΩ
V
VDD-VC=VC-VSS=4.0V
-1.6
VDS
-2.2
-1.0
0.5
Iol=50µA
VDD-VC=VC-VSS=4.5V
Ioh=-50µA
VDD-VC=VC-VSS=3.2V
Iol=50µA
VDD-VC=VC-Vss=2.0V
Ioh=-50µA,
VDD-VC=VC-VSS=3.2V
VDD-VC=VC-VSS=3.2V
VDD-VC=VC-VSS=2V
VOL1
VOH1
VOL2
VOH2
Nch ON voltage of COUT
Pch ON voltage of COUT
Nch ON voltage of DOUT
Pch ON voltage of DOUT
0.4
7.4
0.2
V
6.8
6.8
V
0.5
V
7.4
4.0
V
IDD
IS
Supply current
Standby current
8.0
2.0
µA
µA
1.2
*Note: We compensate for this characteristic related to temperature by laser-trim, however, this specification is guaranteed by design, not
production tested.
8
R5460xxxxxx
OPERATION
• VDET1U, VDET1L / Over-Charge Detectors
The VDET1U and VDET1L monitor the voltage between VDD pin and VC pin (the voltage of Cell1) and
the voltage between VC pin and VSS pin (the voltage of Cell2), if either voltage becomes equal or more
than the over-charge detector threshold, the over-charge is detected, and an external charge control
Nch MOSFET turns off with COUT pin being at "L" level.
VDET1U is the detector of Cell1, and the VDET1L is the detector of Cell2.
To reset the over-charge and make the COUT pin level to "H" again after detecting over-charge, in such
conditions that a time when the both Cell1 and Cell2 are down to a level lower than over-charge voltage,
by connecting a kind of load to VDD after disconnecting a charger from the battery pack. Then, the
output voltage of COUT pin becomes "H", and it makes an external Nch MOSFET turn on, and charge
cycle is available. In other words, once over-charge is detected, even if the supply voltage becomes low
enough, if a charger is continuously connected to the battery pack, recharge is not possible. Therefore
this over-charge detector has no hysteresis. To judge whether or not load is connected, the built-in
excess-discharge current detector is used. By connecting some load, V- pin voltage becomes equal or
more than excess-discharge current detector threshold, and reset the over-charge detecting state.
Further, either or both voltage of Cell1 and Cell2 is higher than the over-charge detector threshold, if
a charger is removed and some load is connected, COUT outputs “L”, however, load current can flow
through the parasitic diode of the external charge control Nch MOSFET. After that, when the VDD pin
voltage becomes lower than the over-charge detector threshold, COUT becomes “H”.
Internal fixed output delay times for over-charge detection and release from over-charge exist. If
either or both of the voltage of Cell1 or Cell2 keeps its level more than the over-charge detector
threshold, and output delay time passes, over-charge voltage is detected. Even when the voltage of
Cell1 or Cell2 pin level becomes equal or higher level than VDET1 if these voltages would be back to a level
lower than the over-charge detector threshold within a time period of the output delay time, the
over-charge is not detected. Besides, after detecting over-charge, while the both of Cell1 and Cell2
voltages are lower than the over-charge detector threshold, even if a charger is removed and a load is
connected, if the voltage is recovered within output delay time of release from over-charge, over-charge
state is not released.
A level shifter incorporated in a buffer driver for the COUT pin makes the "L" level of COUT pin to the V
- pin voltage and the "H" level of COUT pin is set to VDD voltage with CMOS buffer.
• VDET2U, VDET2L / Over-Discharge Detectors
The VDET2U and VDET2L monitor the voltage between VDD pin and VC pin (Cell1 voltage) and the
voltage between VC pin and VSS pin (Cell2 Voltage). When either of the cell1 or cell2 voltage becomes
equal or less than the over-discharge detector threshold, the over-discharge is detected and discharge
9
R5460xxxxxx
stops by the external discharge control Nch MOSFET turning off with the DOUT pin being at "L" level.
To reset the over-discharge detector, if both voltages of Cell1 and Cell2 are equal or lower than the
over-discharge detector threshold, a charge current flows through the parasitic diode of the external
MOSFET. Then, when the VDD voltage becomes higher than the over-discharge detector threshold,
DOUT becomes “H” and the external MOSFET turns on and discharge will be possible. After connecting
a charger, if both voltages of cell1 and cell2 are higher than over-discharge detector threshold, DOUT
becomes "H" immediately. In the case of A version, even if a charger is not connected, when the Cell1
and Cell2 voltages become equal or more than the released voltage from over-discharge, the
over-discharge is released and the voltage of the DOUT pin becomes “H”. Therefore, the over-discharge
detector of A version has some hysterisis.
When a cell voltage equals to zero, if the voltage of a charger is equal or more than 0V-charge
minimum voltage (Vst), COUT pin becomes "H" and a system is allowable to charge.
The output delay time for over-discharge detect is fixed internally. Even if the voltage of Cell1 or Cell2
is down to equal or lower than the over-discharge detector threshold, if the voltage of Cell1 or Cell2
would be back to a level higher than the over-discharge detector threshold within a time period of the
output delay time, the over-discharge is not detected. Output delay time for release from over-discharge
is also set.
After detecting over-discharge, supply current would be reduced and be into standby by halting
unnecessary circuits and consumption current of the IC itself is made as small as possible.
The output type of DOUT pin is CMOS having "H" level of VDD and "L" level of VSS.
• VDET3 /Excess discharge-current Detector, Short Circuit Protector
Both of the excess current detector and short circuit protection can work when the both of control
FETs are in "ON" state.
When the V- pin voltage is up to a value between the short protection voltage Vshort /VDD and excess
discharge-current threshold VDET3, VDET3 operates and further soaring of V- pin voltage higher than
Vshort makes the short circuit protector enabled. This leads the external discharge control Nch
MOSFET turns off with the DOUT pin being at "L" level.
An output delay time for the excess discharge-current detector is internally fixed.
A quick recovery of V- pin level from a value between Vshort and VDET3 within the delay time keeps the
discharge control FET staying "H" state. Output delay time for Release from excess discharge-current
detection is also set.
When the short circuit protector is enabled, the DOUT would be "L" and the delay time is also set.
The V - pin has a built-in pull-down resistor to the Vss pin, that is, the resistance to release from
excess-discharge current.
After an excess discharge-current or short circuit protection is detected, removing a cause of excess
discharge-current or external short circuit makes an external discharge control FET to an "ON" state
10
R5460xxxxxx
automatically with the V- pin level being down to the VSS level through the built-in pulled down resistor.
The reset resistor of excess discharge-current is off at normal state. Only when detecting excess dis-
charge-current or short circuit, the resistor is on.
Output delay time of excess discharge-current is set shorter than the delay time for over-discharge
detector. Therefore, if VDD voltage would be lower than VDET2 at the same time as the excess dis-
charge-current is detected, the R5460xxxxxx is at excess discharge-current detection mode. By dis-
connecting a load, VDET3 is automatically released from excess discharge-current.
• VDET4/ Excess charge-current detector
When the battery pack is chargeable and discharge is also possible, VDET4 senses V- pin voltage.
For example, in case that a battery pack is charged by an inappropriate charger, an excess current
flows, then the voltage of V- pin becomes equal or less than excess charge-current detector threshold.
Then, the output of COUT becomes "L", and prevents from flowing excess current in the circuit by
turning off the external Nch MOSFET.
Output delay of excess charge current is internally fixed. Even the voltage level of V- pin becomes
equal or lower than the excess charge-current detector threshold, the voltage is higher than the VDET4
threshold within the delay time, the excess charge current is not detected. Output delay for the release
from excess charge current is also set.
VDET4 can be released with disconnecting a charger and connecting a load.
• DS (Delay Shorten) function
Output delay time of over-charge, over-discharge, and release from those detecting modes can be
shorter than those setting value by forcing equal or less than the delay shortening mode voltage to V-
pin when the COUT is “H”.
• Operation against 2-Cell Unbalance
A/D version: If one of the cells detects over-charge and the output of COUT becomes "L" and keeps the
status, even if the other cell detects over-charge or over-discharge or short, the over-charge status is
maintained and the output of COUT keeps "L". If one of the cell detects over-charge and the output of
COUT becomes "L", the other cell detects over-discharge and the former cell is released from
over-charge, after the delay time of the released from over-charge, the output of COUT becomes "H",
and after the delay time of detecting over-discharge, the output of DOUT becomes "L". After detecting
over-discharge, A version halts internal unnecessary circuits and be into the standby mode. (Supply
current Max. 2.0µA)
B version: If one of the cells detects over-charge and the output of COUT becomes "L" and keeps the
status, even if the other cell detects over-charge or over-discharge or short, the over-charge status is
maintained and the output of COUT keeps "L". If one of the cells detects over-discharge and the
output of DOUT becomes "L", even if the other cell detects over-charge, the former cell also detects
over-discharge, therefore, the output of DOUT keeps "L". After detecting over-discharge, B version
11
R5460xxxxxx
halts internal unnecessary circuits and becomes into the standby mode. (Supply current Max.
0.1µA).
C version: If one of the cells detect over-charge, and when the COUT becomes "L", even if the other
cell would detect over-discharge or short, the over-charge detector will be dominant and COUT keeps
the "L" level. If one of the cell detects the over-discharge, and when the DOUT becomes "L", in case
that a charger is connected to the battery pack and the other cell detects over-charge, the internal
counter will start and after the delay time of over-discharge detector, DOUT will become "H". After the
delay time of over-charge release from when the internal counter starts, COUT will be "L". If the
over-discharge is detected, internal unnecessary circuits will be cut off and the standby mode will be
realized. (Standby current Max. 0.1µA)
In any versions, the external FETs do not turn off at the same time.
12
R5460xxxxxx
TIMING CHART
(1) Timing diagram of Over-charge, Excess charge current
Excess
Charge
Current
Connect Charger
Connect Load
Charger Open
and Connect
Load
DET1
V
DD
C
V -V
VREL1
t
DET1
V
SS
C
V - V
V
REL1
t
DD
V
V
DET3
V
V-
SS
VDET4
t
REL1
V
REL1 t
ＤＥＴ4
t
REL4
V
V
t
DD
V
OUT
C
VDET1
t
VDET1
t
V-
t
t
Charge Current
Charge/
Discharge
Current
0
13
R5460xxxxxx
(2) Over-discharge, Excess discharge current, Short circuit
AA/ADversion
Excess
Connect Load
Connect Charger
Short
discharge
Open
Open
current
C
V
VDD
REL2U
DET2U
V
-
V
t
REL2L
DET2L
SS
VC
V
V
V
−
t
DD
short
DET3
V
V
V
V
V-
SS
DET4
V
t
REL2
V
REL3
V
t
τ
ΡΕΛ3
V
t
REL2
V
t
DD
V
t V
DET3
tshort
OUT
D
t
DET2
t
DET2
V
V
Vss
t
Charge Current
Charge/Discharge
Current
0
t
14
R5460xxxxxx
AB/AC version
Connect
Load
Connect
Charger
Excess-
discharge
Current
Connect
Charger
Short
Open
Connect Load
Open
DD
C
V - V
DET2
V
t
C- SS
V
V
DET2
V
t
DD
short
DET3
V
V
V
V-
V
V
DET4
t
t
REL2
V
t
REL3
V
t
REL3 t
V
V
REL2
V
DD
tshort
OUT
D
VDET2
t V
DET2
t
t
VDET3
Vss
t
Charge
Current
Charge/
Discharge
Current
0
t
15
R5460xxxxxx
(3) Operation with unbalanced cells
AC version
Connect
Load
Connect
Connect Load
Connect
Open
VDET1L
VREL1L
VDD - VC
t
t
VC - VSS
VDET2L
VDD
VDET3
V-
VSS
VDET4
t
t
VDD
COUT
tVDET1
tVREL1
ＶSS
VDD
DOUT
tVDET2
tVREL2
tVDET2
tVREL2
VSS
t
16
R5460xxxxxx
TYPICAL APPLICATION AND TECHNICAL NOTES
R1 330Ω
VDD
C1
0.1μF
R2 330Ω
Vc
R5460
C2
0.1μF
V-
Vss
DOUT
COUT
C3 0.01μF
R3
1KΩ
TECHNICAL NOTES
R1, R2, C1 and C2 stabilize a supply voltage to the R5460xxxxxx. A recommended R1, R2 value is
less than 1kΩ.
A larger value of R1 and R2 makes the detection voltage shift higher because of some conduction
current in the R5460xxxxxx.
To stabilize the operation, the value of C1 and C2 should be equal or more than 0.01µF.
R1 and R3 can operate also as parts for current limit circuit against reverse charge or applying a
charger with excess charging voltage beyond the absolute maximum rating of the R5460xxxxxx, the
battery pack. Small value of R1 and R3 may cause over-power consumption rating of power dissipation
of the R5460xxxxx. Thus, the total value of 'R1+R3' should be equal or more than 1kΩ.
If R3 value is set too large, after detecting over-discharge, release operation by connecting a charger
may be impossible, our recommendation value as R3 is 3kΩ or less.
To stabilize the operation of the IC, use 0.01µF or more capacitor as C3.
The typical application circuit diagram is just an example. This circuit performance largely depends
on the PCB layout and external components. In the actual application, fully evaluation is necessary.
Over-voltage and the over current beyond the absolute maximum rating should not be forced to the
protection IC and external components.
Ricoh cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Ricoh
product. If technical notes are not complied with the circuit which is used Ricoh product, Ricoh is not responsible
for any damages and any accidents.
17
R5460xxxxxx
TEST CIRCUITS
E
VDD
DD
V
V
OUT
OUT
D
C
C
V
V
V
V-
OUT
D
V
SS
OSCILLOSCOPE
SS
V
V-
F
B
C
D
DD
V
V
DD
V
V
C
C
V
OUT
C
OUT
C
OUT
D
DOUT
V-
VSS
V-
A
V
SS
V
G
H
DD
C
VDD
V
C
V
V
COUT
V
V-
VSS
V-
V
SS
V
DD
C
V
DD
V
V
V
V
C
OUT
C
A
VSS
V-
SS
V
V
V-
18
R5460xxxxxx
I
VDD
VC
COUT
A
V
VSS
V-
J
VDD
VC
DOUT
DOUT
A
VSS
V-
V
K
L
VDD
VC
A
V
VSS
V-
VDD
VC
A
V-
VSS
19
R5460xxxxxx
Typical Characteristics were obtained with using those above circuits:
Test Circuit A: Part1: Typical characteristics 1)
Test Circuit B: Part1: Typical characteristics 2) 4) 6) 7)
Test Circuit C: Part1: Typical characteristics 3) 5)
Test Circuit D: Part1: Typical characteristics 8) 10) 12) 13)
Test Circuit E: Part1: Typical characteristics 9) 11)
Test Circuit F: Part1: Typical characteristics 14) 15) 16) 17) 18) 19)
Test Circuit G: Part1: Typical characteristics 20) 21) 22) 23)
Test Circuit H: Part1: Typical characteristics 24)
Test Circuit I: Part1: Typical characteristics 25)
Test Circuit J: Part1: Typical characteristics 26)
Test Circuit K: Part1: Typical characteristics 27)
Test Circuit L: Part1: Typical characteristics 28) 29) 30)
TYPICAL CHARACTERISTICS (Part 1)
1) Minimum Operating Voltage for 0V Cell Charging 2) Over-charge voltage threshold (Cell1) vs. Temperature
R5460x201AB
R5460x201AB
VDD=VSS=0V
Vc-Vss=3.5V
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
4.375
4.370
4.365
4.360
4.355
4.350
4.345
4.340
4.335
4.330
4.325
-50
-25
0
25
50
75
100
-60 -40 -20
0
20
40
60
80 100
Temperature Topt (°C)
Temperature Topt(°C)
3) Over-Charge Voltage Threshold (Cell2) vs. Temperature
4)Release Voltage from Over-charge (Cell1) vs. Temperature
R5460x201AB
R5460x201AB
VDD-VC=3.5V
4.40
Vc-Vss=3.5V
4.30
4.39
4.38
4.37
4.36
4.35
4.34
4.33
4.32
4.31
4.30
4.29
4.28
4.25
4.20
4.15
4.10
4.05
4.00
-50
-25
0
25
50
75
100
Temperature Topt(°C)
-60 -40 -20
0
20
40
60 80 100
Tempperature Topt（°C）
20
R5460xxxxxx
5) Release Voltage from Over-charge (Cell2) vs.
Temperature
6) Output Delay of Over-charge Detector vs. Temperature
R5460x201AB
R5460x201AB
VDD-VC=3.5V
4.30
VC-VSS=3.5V
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
4.25
4.20
4.15
4.10
4.05
4.00
-60 -40 -20
0
20 40 60 80 100
-60 -40 -20
0
20
40
60
80 100
Temperature Topt(°C)
Temperature Topt(°C)
7)
Output Delay of Release from Over-charge vs. Temperature
8)
Over-discharge Detector Threshold (Cell1) vs. Temperature
R5460x201AB
R5460x201AB
Vc-Vss=3.5V
32
Vc-Vss=3.5V
2.40
2.38
2.35
2.33
2.30
2.28
2.25
2.23
2.20
28
24
20
16
12
8
4
-60 -40 -20
0
20 40 60 80 100
-60 -40 -20
0
20
40
60
80 100
Temperature Topt(°C)
Temperature Topt(°C)
9) Over-discharge Detector Threshold (Cell2) vs.
Temperature
10) Release Voltage from Over-discharge (Cell1) vs.
Temperature
R5460x201AB
R5460x202AA
VDD-VC=3.5V
2.37
Vc-Vss=3.5V
3.20
3.15
3.10
3.05
3.00
2.95
2.90
2.85
2.80
2.35
2.33
2.31
2.29
2.27
2.25
2.23
-60 -40 -20
0
20 40 60 80 100
-50
-25
0
25
50
75
100
Temperature Topt(°C)
Temperature Topt(°C)
21
R5460xxxxxx
11) Release Voltage from Over-discharge (Cell2) vs.
12) Output Delay Time for Over-discharge vs. Temperature
Temperature
R5460x202AA
R5460x201AB
VDD-Vc=3.5V
3.20
Vc-Vss=3.5V
250
225
200
175
150
125
100
75
3.15
3.10
3.05
3.00
2.95
2.90
2.85
2.80
50
25
0
-60 -40 -20
0
20
40
60
80 100
-60 -40 -20
0
20
40
60
80 100
Temperature Topt(°C)
Temperature Topt(°C)
13) Output Delay of Release from Over-discharge vs. Temperature 14) Excess discharge Current Detector Threshold vs. Temperature
R5460x201AB
R5460x201AB
0.220
0.215
0.210
0.205
0.200
0.195
0.190
0.185
0.180
Vc-Vss=3.5V
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-60 -40 -20
0
20 40 60 80 100
-60 -40 -20
0
20 40 60 80 100
Temperature Topt(°C)
Temperature Topt(°C)
15) Output Delay Time for Excess discharge-current Detector vs.
Temperature
16) Output Delay for Release from Excess discharge-current vs.
Temperature
R5460x201AB
R5460x201AB
2.8
20
18
15
13
10
8
2.4
2.0
1.6
1.2
0.8
0.4
0.0
5
3
0
-50
-25
0
25
50
75
100
-60 -40 -20
0
20
40
60
80 100
Temperature Topt (°C)
Temperature Topt(°C)
22
R5460xxxxxx
17) Short Detector Voltage Threshold vs. Temperature 18) Output Delay for Short Detector vs. Temperature
R5460x201AB
R5460x201AB
600
550
500
450
400
350
300
250
200
150
100
50
VDD-VC=VC-VSS=3.5V
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
-50
-25
0
25
50
75
100
-60 -40 -20
0
20 40 60 80 100
Temperature Topt (°C)
Temperature Topt(°C)
19) Release resistance from Excess-discharge current vs.
Temperature
20) Excess-charge current Detector Threshold vs. Temperature
R5460x201AB
R5460x201AB
-0.30
-0.32
-0.34
-0.36
-0.38
-0.40
-0.42
-0.44
-0.46
-0.48
-0.50
VDD-VC=VC-VSS=3.6V
80
75
70
65
60
55
50
45
40
35
30
25
20
15
-50
-25
0
25
50
75
100
-60 -40 -20
0
20 40 60 80 100
Temperature Topt(°C)
Temperature Topt(°C)
21) Output Delay Time of Excess-charge current Detector Threshold 22) Output Delay Time for Release from Excess-charge current vs.
vs. Temperature
Temperature
R5460x201AB
R5460x201AB
20
18
16
14
12
10
8
6
4
2
0
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0.0
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Temperature Topt(°C)
Temperature Topt (°C)
23
R5460xxxxxx
23) Delay Shortening Mode Voltage vs. Temperature
24) Nch ON Voltage of COUT vs. Temperature
R5460x201AB
R5460x201AB
-0.4
-0.6
-0.8
-1.0
-1.2
-1.4
-1.6
-1.8
-2.0
-2.2
-2.4
-2.6
-2.8
VDD-VC=VC-VSS=4.5V, IOL=50µA
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Temperature Topt (°C)
Temperature Topt(°C)
25) Pch ON Voltage of COUT vs. Temperature
26) Nch ON Voltage of DOUT vs. Temperature
R5460x201AB
R5460x201AB
VDD-VC=VC-VSS=2V, IoL=50µA
0.50
VDD-VC=VC-VSS=3.9V, IoH=-50µA
7.9
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
7.7
7.5
7.3
7.1
6.9
6.7
6.5
6.3
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Temperature Topt (°C)
Temperqture Topt (°C)
27) Pch ON Voltage of DOUT vs. Temperature
28) Supply Current vs. Temperature
V
DD-V
C
=V
C
-VSS=3.9V、Dout・VSS=-50µA
VDD-VCC=VC-VSS=3.9V
10
ꢀMin=6.8Ｖ, Typ.=7.4V
8.3
8.1
7.9
7.7
7.5
7.3
7.1
6.9
6.7
6.5
6.3
9
8
7
6
5
4
3
2
1
0
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Temperature Topt(°C)
Temperature (°C)
24
R5460xxxxxx
29) Standby Current vs. Temperature (Ver. A.)
30) Standby Current vs. Temperature (Ver. B.)
R5460X202AA (VDD-Vc=Vc-Vss=2.0V)
R5460x201AB (VDD-VC=VC-VSS=2.0V)
2.0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Temperature Topt(C)
Temperature Topt (°C)
Part 2 Delay Time dependence on VDD
1) Delay Time for Over-charge detector vs. VDD
2) Delay Time for Release from Over-charge vs. VDD
R5460x20XAX
R5460x20XAX
V-=0V,VDD=3.5V to 4.4V, 5.0V, 5.6V Vc-Vss =3.5V
V-=0V,VDD=4.5V to 3.2V,3.7V,4.0V,Vc-Vss=3.5V
18
1.2
16
14
12
10
8
6
4
1
0.8
0.6
0.4
0.2
0
2
0
3
3.5
4
4.5
4
4.5
5
5.5
6
VDD[V]
VDD[V]
3) Output Delay of Over-discharge detector vs. VDD
4)
Output Delay for Release from Over-discharge vs. VDD
R5460x20XAX
R5460x20XAX
V-=0V,VDD=3.5V to 2.2V,2.0V,1.5V,Vc-Vss=3.5V
140
V-=0V,VDD=2.2V to 2.5V,3.3V,4.2V Vc-Vss=3.5V
1.6
1.4
1.2
1
120
100
80
60
40
20
0
0.8
0.6
0.4
0.2
0
1
1.5
2
2.5
2
2.5
3
3.5
VDD[V]
4
4.5
VDD[V]
25
R5460xxxxxx
5) Output Delay for Excess Discharge Current
vs. VDD
6)
Output Delay for Release from Excess Discharge
Current Detect vs. VDD
R5460x20XAX
VDD=2.4V,3.3V ,4.2V Vc-Vss=3.5V V-=3.0V to 0V
R5460x20XAX
VDD=2.4V,3.3V ,4.2V,Vc-Vss=3.5V,V-=0V to 0.5V
14
1.4
1.2
1
12
10
8
0.8
0.6
0.4
0.2
0
6
4
2
0
2
2.5
3
3.5
4
4.5
2
2.5
3
3.5
VDD[V]
4
4.5
VDD[V]
7) Delay Time for Excess Charge Current Detector
vs. VDD
8) Delay Time for release from Excess charge
current detect vs. VDD
R5460x20XAX
R5460x20XAX
VDD=2.4V, 3.3V, 4.2V Vc-Vss=3.5V V-=0V to -0.9V
VDD=2.4V, 3.3V, 4.2V Vc-Vss=3.5V V-=-0.9V to 0V
9
1.4
8
7
6
5
4
3
2
1
0
1.2
1
0.8
0.6
0.4
0.2
0
2
2.5
3
3.5
VDD[V]
4
4.5
2
2.5
3
3.5
VDD[V]
4
4.5
9) Output Delay for Short vs. VDD
R5460x20XAX
VDD=2.4V, 3.3V, 4.2V Vc-Vss=3.5V V-=0V to 1.5V
350
300
250
200
150
100
50
0
2
2.5
3
3.5
VDD[V]
4
4.5
26
R5460xxxxxx
Part 3
Supply Current dependence on VDD
Test Circuit
PACK+
R1 330Ω
A
CELL1
VDD
C1
0.1μF
R2 330Ω
Vc
R5460
C2
0.1μF
V-
DOUT COUT
Vss
CELL2
C3 0.01μF
R3
1KΩ
PACK-
Supply Current vs. VDD
A version
Bversion
5
4.5
4
5
4.5
4
3.5
3
3.5
3
2.5
2
2.5
2
1.5
1
1.5
1
0.5
0
0.5
0
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
VDD(V)
VDD(V)
27
R5460xxxxxx
Part 4 Over-charge detector, Release voltage from Over-charge, Over-discharge detector, Release voltage
from Over-discharge dependence on External Resistance value
Test Circuit
PACK+
R1
CELL1
VDD
Vc
C1
0.1μF
R2 330Ω
R5460
DOUT
C2
0.1μF
V-
Vss
COUT
CELL2
C3 0.01μF
R3
1KΩ
PACK-
Over-charge Detector Threshold / Released Voltage from Over-discharge vs. R1
R5460x202AA
R5460x201AB
ꢀꢀꢀꢀꢀ Over-charge threshold
Over-charge released
4.266
4.264
4.262
4.26
4.361
4.359
4.357
4.355
4.353
4.351
4.349
4.347
4.345
4.343
4.341
4.164
4.162
4.16
4.158
4.156
4.154
4.152
4.15
ꢀꢀꢀꢀꢀ Over-charge threshold
4.064
Over-charge released voltage
4.06
4.258
4.256
4.254
4.252
4.25
4.056
4.052
4.048
4.044
4.04
4.248
4.246
4.244
4.242
4.24
4.148
4.146
4.144
0
200
400
600
800 1000
0
200 400 600 800 1000
R1[Ω]
R1[Ω]
Over-discharge / Released from Over-charge Threshold vs. R1
R5460x201AB
R5460x202AA
2.406
2.404
2.402
2.4
2.398
2.396
2.394
2.392
2.39
3.07
3.06
3.05
3.04
3.03
3.02
3.01
3
2.316
2.314
2.312
2.31
2.308
2.306
2.304
2.302
2.3
2.5
ꢀꢀꢀꢀꢀ Over-discharge threshold
Over-discharge released
voltage
ꢀꢀꢀꢀOver-discharge threshold
Over-discharge released voltage
2.46
2.42
2.38
2.34
2.3
2.99
2.98
2.97
2.388
2.386
2.298
2.296
0
200 400 600 800 1000
0
200 400 600 800 1000
R1[Ω]
R1[Ω]
28
R5460xxxxxx
Part 5
Charger Voltage at Released from Over-discharge with a Charger dependence on R2
Test Circuit
PACK+
R1
330Ω
CELL1
VDD
C1
0.1μF
330Ω
R2
Vc
R5460
DOUT
C2
0.1μF
V-
Vss
COUT
CELL2
C3 0.01μF
R3
PACK-
Charger Voltage at Release from Over-discharge with a charger vs. R2
R5460x201AB
CELL1=4.25V,CELL2=4.25V
10
9
8
7
6
5
4
3
2
1
0
0
1
2
3
4
5
6
7
8
9
10
11
12
R3[kΩ]
29
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