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'99.9.21
Li-Ion BATTERY PROTECTOR
R5421NxxxC/xxxF series
s OUTLINE
The R5421NxxxC/F Series are protection ICs for over-charge/discharge of rechargeable one-cell Lithium-ion (Li+) excess load current, further include a short circuit protector for preventing large external short circuit current. Each of these ICs is composed of three voltage detectors, a reference unit, a delay circuit, a short circuit protector, and a logic circuit. When charging voltage crosses the detector threshold from a low value to a value higher than VDET1, the output of COUT pin, the output of over-charge detector/VD1, switches to low level, charger's negative pin level. After detecting over-charge the VD1 can be reset and the output of COUT becomes high when the VDD voltage is coming down to a level lower than "VREL1", or when a kind of loading is connected to VDD after a charger is disconnected from the battery pack while the VDD level is in between "VDET1" and "VREL1" in the R5421NxxxC/F version. The output of DOUT pin, the output of over-discharge detector/VD2, switches to low level after internally fixed delay time passed, when discharging voltage crosses the detector threshold from a high value to a value lower than VDET2. After R5421NxxxC/F Series detect the over-discharge voltage, connect a charger to the battery pack, and when the battery supply voltage becomes higher than the over-discharge detector threshold, VD2 is released and the voltage of DOUT becomes "H" level. In the case of F version, after detecting the over-discharge detection, when the battery supply voltage becomes equal or higher than over-discharge released voltage, VD2 is also released by the condition, and the voltage of DOUT becomes "H" level. An excess load current can be sensed and cut off after internally fixed delay time passed through the built in excess current detector, VD3, with DOUT being enabled to low level. Once after detecting excess current, the VD3 is released and DOUT level switches to high by detaching a battery pack from a load system. Further, short circuit protector makes DOUT level to low immediately with external short circuit current and removing external short circuit leads DOUT level to high. After detecting over-discharge, supply current will be kept extremely low by halt some internal circuits operation. The output delay of over-charge detectors can be set by connecting external capacitors. Output type of COUT and DOUT are CMOS. 6-pin, SOT23-6 is available.
s FEATURES
Low supply current....................................................Supply current Standby current (detecting over-discharge)
Typ. 3.0A Typ. 0.3A (for R5421NxxxC) Typ. 1.0A (for R5421NxxxF)

High accuracy detector threshold ..............................Over-charge detector (Topt=25C) 25mV (Topt=0 to 50C) 30 mV Over-discharge detector 2.5% Variety of detector threshold .....................................Over-charge detector threshold 4.0V - 4.4V step of 0.005V Over-discharge detector threshold 2.0V - 3.0V step of 0.005V Built-in protection circuit ..........................................Excess current protection 0.05V - 0.4V step of 0.005V Accuracy 15% Output delay of over-charge ......................................Time delay at C3=0.01F and VDD=4.3V 75ms for R5421N111C Output delay of over-discharge .................................VDD=2.4V with built-in capacitor 10ms for R5421N111C/112C Small package............................................................SOT-23-6 / 6-pin
s APPLICATIONS
Li+ one-cell protector for battery pack High precision protectors for cell-phones and any other gadgets using on board Li+ one-cell battery
Rev.1.11
-1-
s BLOCK DIAGRAM
R5421NxxxC
5 VDD 4 Ct
Level Shifter VD1
Delay VD2
Short circuit Detector
VD3
6
VSS
1
DOUT
3
COUT
2
V-
R5421NxxxF
5 VDD 4 Ct
Level Shifter VD1
Delay VD2
Short circuit Detector
VD3
6
VSS
1
DOUT
3
COUT
2
V-
Rev.1.11
-2-
s SELECTION GUIDE
In the R5421Nxxxx Series three of the input threshold for over-charge, over-discharge and excess current detectors can be designated. Part Number is designated as follows: R5421N XXXX-XX Part Number abc Code a b c Description Serial Number for the R5421N Series designating input threshold for over-charge, over-discharge and excess current detectors as well as hysteresis range for over-charge detector. Designation of version symbols Taping Type: TR (refer to Taping Specification)
s PIN CONFIGURATION
6 5 4
(mark side)
1
2
3
s PIN DESCRIPTION
Pin No. 1 2 3 4 5 6 Symbol DOUT VCOUT Ct VDD VSS Pin description Output of over-discharge detection, CMOS output Pin for charger negative input Output of over-charge detection, CMOS output Pin for external capacitor setting output delay of VD1 Power supply Ground
Rev.1.11
-3-
s ABSOLUTE MAXIMUM RATINGS
Symbol VDD VVCt VCOUT VDOUT PD Topt Tstg Item Supply voltage Input Voltage V - pin Ct pin Output voltage COUT pin DOUT pin Power dissipation Operating temperature range Storage temperature range Ratings -0.3 to 12 VDD -28 to VDD +0.3 VSS -0.3 to VDD +0.3 VDD -28 to VDD +0.3 VSS -0.3 to VDD +0.3 150 -40 to 85 -55 to 125 VSS=0V Unit V V V V V mW C C
ABSOLUTE MAXIMUM RATINGS Absolute Maximum ratings are threshold limit values that must not be exceeded ever for an instant under any conditions. Moreover, such values for any two items must not be reached simultaneously. Operation above these absolute maximum ratings may cause degradation or permanent damage to the device. These are stress ratings only and do not necessarily imply functional operation below these limits.
Rev.1.11
-4-
s ELECTRICAL CHARACTERISTIC
q R5421N111C Symbol Item VDD1 Operating input voltage Minimum operating Vst Voltage for 0V charging VDET1 Over-charge threshold Conditions Voltage defined as VDD - VSS Voltage defined as VDD - V- , VDD - VSS=0V Detect rising edge of supply voltage (Topt=25C) (Topt=0 to 50C)*Note MIN. 1.5 TYP. Topt=25C MAX. Unit 10 V 1.2 V
4.225 4.220 4.00
4.250 4.250 4.05 75 2.500 10 0.20
4.275 4.280 4.10 90 2.563 13 0.23
V V V ms V ms V
VREL1 tVDET1 VDET2 tVDET2 VDET3 tVDET3
Release voltage for overcharge detection Output delay of overCharge Over-discharge threshold Output delay of overDischarge Excess current threshold
C3=0.01F, VDD=3.6V to 4.3V Detect falling edge of supply voltage VDD=3.6V to 2.4V Detect rising edge of 'V-' pin voltage
60 2.437 7 0.17
Output delay of excess VDD=3.0V 9 13 17 ms Current Vshort Short protection voltage VDD=3.0V VDD-1.2 VDD-0.9 VDD-0.6 V Output Delay of Short tshort VDD=3.0V 5 50 s protection Reset resistance for Excess Rshort VDD=3.6V, V- =1.0V 50 100 150 k current protection Vol1 Nch ON voltage of COUT Iol=50A, VDD=4.4V 0.35 0.5 V Voh1 Pch ON voltage of COUT Ioh=-50A, VDD=3.9V 3.4 3.7 V Vol2 Nch ON voltage of DOUT Iol=50A, VDD=2.4V 0.2 0.5 V Voh2 Pch ON voltage of DOUT Ioh=-50A, VDD=3.9V 3.4 3.7 V IDD Supply current VDD=3.9V, V- =0V 3.0 6.0 A Istandby Standby current VDD=2.0V 0.3 0.6 A *Note: Considering of variation in process parameters, we compensate for this characteristic related to temperature by lasertrim, however, this specification is guaranteed by design, not production tested.
Rev.1.11
-5-
q
R5421N112C Symbol Item VDD1 Operating input voltage Minimum operating Vst Voltage for 0V charging VDET1 Over-charge threshold
Conditions Voltage defined as VDD - VSS Voltage defined as VDD - V- , VDD - VSS=0V Detect rising edge of supply Voltage Topt=25C Topt=0 to 50C*Note
MIN. 1.5
TYP.
MAX. 10 1.2
Topt=25C Unit V V
4.325 4.320 4.100
4.350 4.350 4.150 77 2.500 10 0.20
4.375 4.380 4.200 93 2.563 13 0.23
V V V ms V ms V
VREL1 tVDET1 VDET2 tVDET2 VDET3 tVDET3
Release voltage for overcharge detection Output delay of overCharge Over-discharge threshold Output delay of overDischarge Excess current threshold
C3=0.01F, VDD=3.6V to 4.4V Detect falling edge of supply Voltage VDD=3.6V to 2.4V Detect rising edge of 'V-' pin Voltage
61 2.437 7 0.17
Output delay of excess VDD=3.0V 9 13 17 ms Current Vshort Short protection voltage VDD=3.0V VDD-1.2 VDD-0.9 VDD-0.6 V Output Delay of Short tshort VDD=3.0V 5 50 s protection Reset resistance for excess Rshort VDD=3.6V, V- =1.0V 50 100 150 k current protection Vol1 Nch ON voltage of COUT Iol=50A, VDD=4.4V 0.35 0.5 V Voh1 Pch ON voltage of COUT Ioh=-50A, VDD=3.9V 3.4 3.7 V Vol2 Nch ON voltage of DOUT Iol=50A, VDD=2.4V 0.2 0.5 V Voh2 Pch ON voltage of DOUT Ioh=-50A, VDD=3.9V 3.4 3.7 V IDD Supply current VDD=3.9V,V- =0V 3.0 6.0 A Istandby Standby current VDD=2.0V 0.3 0.6 A *Note: Considering of variation in process parameters, we compensate for this characteristic related to temperature by lasertrim, however this specification is guaranteed by design, not production tested.
Rev.1.11
-6-
q
R5421N151F Symbol Item VDD1 Operating input voltage Minimum operating Vst Voltage for 0V charging VDET1 Over-charge threshold
Conditions Voltage defined as VDD - VSS Voltage defined as VDD - V- , VDD - VSS=0V Detect rising edge of supply Voltage Topt=25C Topt=0 to 50C*Note
MIN. 1.5
TYP.
MAX. 10 1.2
Topt=25C Unit V V
4.225 4.220 4.000
4.250 4.250 4.050 75 2.500 10 0.20
4.275 4.280 4.100 90 2.563 13 0.23
V V V ms V ms V
VREL1 tVDET1 VDET2 tVDET2 VDET3 tVDET3
Release voltage for overcharge detection Output delay of overCharge Over-discharge threshold Output delay of overDischarge Excess current threshold
C3=0.01F, VDD=3.6V to 4.3V Detect falling edge of supply Voltage VDD=3.6V to 2.4V Detect rising edge of 'V-' pin Voltage
60 2.437 7 0.17
Output delay of excess VDD=3.0V 9 13 17 ms Current Vshort Short protection voltage VDD=3.0V VDD-1.2 VDD-0.9 VDD-0.6 V Output Delay of Short tshort VDD=3.0V 5 50 s protection Reset resistance for excess Rshort VDD=3.6V, V- =1.0V 50 100 150 k current protection Vol1 Nch ON voltage of COUT Iol=50A, VDD=4.4V 0.35 0.5 V Voh1 Pch ON voltage of COUT Ioh=-50A, VDD=3.9V 3.4 3.7 V Vol2 Nch ON voltage of DOUT Iol=50A, VDD=2.2V 0.2 0.5 V Voh2 Pch ON voltage of DOUT Ioh=-50A, VDD=3.9V 3.4 3.7 V IDD Supply current VDD=3.9V,V- =0V 3.0 6.0 A Istandby Standby current VDD=2.0V 1.0 2.0 A *Note: Considering of variation in process parameters, we compensate for this characteristic related to temperature by lasertrim, however, this specification is guaranteed by design, not production tested.
Rev.1.11
-7-
q
R5421N152F Symbol Item VDD1 Operating input voltage Minimum operating Vst Voltage for 0V charging VDET1 Over-charge threshold
Conditions Voltage defined as VDD - VSS Voltage defined as VDD - V- , VDD - VSS=0V Detect rising edge of supply Voltage Topt=25C Topt=0 to 50C*Note
MIN. 1.5
TYP.
MAX. 10 1.2
Topt=25C Unit V V
4.325 4.320 4.100
4.350 4.350 4.150 77 2.500 10 0.20
4.375 4.380 4.200 93 2.563 13 0.23
V V V ms V ms V
VREL1 tVDET1 VDET2 tVDET2 VDET3 tVDET3
Release voltage for overcharge detection Output delay of overCharge Over-discharge threshold Output delay of overDischarge Excess current threshold
C3=0.01F, VDD=3.6V to 4.4V Detect falling edge of supply Voltage VDD=3.6V to 2.4V Detect rising edge of 'V-' pin Voltage
61 2.437 7 0.17
Output delay of excess VDD=3.0V 9 13 17 ms Current Vshort Short protection voltage VDD=3.0V VDD-1.2 VDD-0.9 VDD-0.6 V Output Delay of Short tshort VDD=3.0V 5 50 s protection Reset resistance for excess Rshort VDD=3.6V, V- =1.0V 50 100 150 k current protection Vol1 Nch ON voltage of COUT Iol=50A, VDD=4.4V 0.35 0.5 V Voh1 Pch ON voltage of COUT Ioh=-50A, VDD=3.9V 3.4 3.7 V Vol2 Nch ON voltage of DOUT Iol=50A, VDD=2.2V 0.2 0.5 V Voh2 Pch ON voltage of DOUT Ioh=-50A, VDD=3.9V 3.4 3.7 V IDD Supply current VDD=3.9V,V- =0V 3.0 6.0 A Istandby Standby current VDD=2.0V 1.0 2.0 A *Note: Considering of variation in process parameters, we compensate for this characteristic related to temperature by lasertrim, however, this specification is guaranteed by design, not production tested.
Rev.1.11
-8-
s OPERATION
q VD1 / Over-Charge Detector in the 'C' version The VD1 monitors VDD pin voltage. When the VDD voltage crosses over-charge detector threshold VDET1 from a low value to a value higher than the VDET1, the VD1 can sense a over-charging and an external charge control Nch-MOS-FET turns to "OFF" with COUT pin being at "Low" level. There can be two cases to reset the VD1 making the COUT pin level to "High" again after detecting over-charge. Resetting the VD1 can make charging system allowable to resumption of charging process. The first case is in such conditions that a time when the VDD voltage is coming down to a level lower than "VREL1". While in the second case, connecting a kind of loading to VDD after disconnecting a charger from the battery pack can make the VD1 resetting when the VDD level is in between "VDET1" and "VREL1". After detecting over-charge with the VDD voltage of higher than VDET1, connecting system load to the battery pack makes load current allowable through parasitic diode of external charge control FET. The COUT level would be High when the VDD level is coming down to a level below the VDET1 by continuous drawing of load current. An output delay time for over-charge detection can be set by external capacitor C3 connecting between the VSS pin and Ct pin. The external capacitor can make a delay time from a moment detecting over-charge to a time output a signal which enables charge control FET turn to "OFF". When the VDD level is going up to a higher level than VDET1 if the VDD voltage would be back to a level lower than the VDET1 within a time period of the output delay time, VD1 would not output a signal for turning "OFF" of charge control FET. The output delay time can be calculated as below: tVDET1[sec] = (C3[F] x (VDD[V]-0.7) / (0.48 x 10-6) Note:Topt=25C VDD value should be after over-charge detection. A level shifter incorporated in a buffer driver for the COUT pin makes the "Low" level of COUT pin to the V - pin voltage and the "High" level of COUT pin is set to VDD voltage with CMOS buffer. q VD2 / Over-Discharge Detector The VD2 is monitoring a VDD pin voltage. When the VDD voltage crosses the over-discharge detector threshold VDET2 from a high value to a value lower than the VDET2, the VD2 can sense an over-discharging and the external discharge control Nch MOS FET turns to "OFF" with the DOUT pin being at "Low" level. To reset the VD2 with the DOUT pin level being "H" again after detecting over-discharge it is necessary to connect a charger to the battery pack for R5421NxxxC. When the VDD voltage stays under over- discharge detector threshold VDET2 charge current can flow through parasitic diode of external discharge control MOS FET, then after the VDD voltage comes up to a value larger than VDET2, DOUT becomes "H" and discharging process would be able to advance through ON state MOS FET for discharge control. Connecting a charger to the battery pack makes the DOUT level being "H" instantaneously when the VDD voltage is higher than VDET2. Besides, for R5421NxxxF, when a cell voltage reaches equal or more than over-discharge released voltage, or VREL2, overdischarge condition can be also released When a cell voltage equals to zero, connecting charger to the battery pack makes the system allowable to charge with higher charge voltage than Vst, 1.2V Max. An output delay time for the over-discharge detection is fixed internally, tVDET2=10ms typ. at VDD=2.4V. When the VDD level is going down to a lower level than VDET2 if the VDD voltage would be back to a level higher than the VDET2 within a time period of the output delay time, VD2 would not output a signal for turning "OFF" of discharge control FET. After detection of an over-discharge by VD2, supply current would be reduced to typically 0.3A(for R5421NxxxC) or 1.0A(for R5421NxxxF) at VDD=2.0V and into standby, only the charger detector is operating. The output type of DOUT pin is CMOS having "H" level of VDD and "L" level of VSS.
Rev.1.11
-9-
q VD3/Excess Current Detector, Short Circuit Protector Both of the excess current detector and short circuit protector can work when both control FETs are in "ON" state. When the V- pin voltage is going up to a value between the short protection voltage Vshort /VDD and excess current threshold VDET3, the excess current detector operates and further soaring of V- pin voltage higher than Vshort makes the short circuit protector enabled. This leads the external discharge control Nch MOS FET turns to "OFF" with the DOUT pin being at "Low" level. An output delay time for the excess current detector is internally fixed, 13ms typ. at VDD=3.0V. A quick recovery of V- pin level from a value between Vshort and VDET3 within the delay time keeps the discharge control FET staying "High" state. When the short circuit protector is enabled ,the DOUT would be Low and its delay time would be 5s typ. The V - pin has a built-in pulled down resistor ,typ.100k, with connecting to the VSS pin. After an excess current or short circuit protection is detected, removing a cause of excess current or external short circuit makes an external discharge control FET to an "ON" state automatically with the V- pin level being down to the VSS level through pulled down resistor built-in internally. If VDD voltage would be higher than VDET2 at a time when the excess current is detected the R5421NxxxC does not enter a standby mode, or otherwise in case of lower VDD voltage than VDET2 would lead the R5421NxxxC into a standby. After detecting short circuit the R5421NxxxC will not enter a standby mode.
Rev.1.11
- 10 -
s TEST CIRCUITS
5 4 V 2 3 6 6 0.01F V 2 1 5
Test Circuit 1
Test Circuit 2
5
5 50A
2 V A
1
2
3 V
6
6
Test Circuit 3
Test Circuit 4
50A
5 50A 2 3 V 6
5
1
2
V
6
Test Circuit 5
Test Circuit 6
Rev.1.11
- 11 -
50A 5 1
5 A
2
V
2
6
6
Test Circuit 7
R1 5 3 C1 V 2 1 6
V C2
Test Circuit 8
5
C3
R2 2 1 6
Test Circuit 9 The typical characteristics were obtained by use of these test circuits. Test Circuit 1 Test Circuit 2 Test Circuit 3 Test Circuit 4 Test Circuit 5 Test Circuit 6 Test Circuit 7 Test Circuit 8 Test Circuit 9 Test Circuit 10 : Typical Characteristics 1) 5) 7) 17) : Typical Characteristics 2) 6) 8) : Typical Characteristics 3) 4) 9) 10) 19) : Typical Characteristics 13) : Typical Characteristics 14) : Typical Characteristics 15) : Typical Characteristics 16) : Typical Characteristics 11) 12) : Typical Characteristics 21) : Typical Characteristics 18) 20)
Test Circuit 10
Rev.1.11
- 12 -
s TYPICAL CHARACTERISTICS
1) Over-charge Threshold vs. Temperature
4.270 4.260 4.250 4.240 4.230 4.220 4.210 4.200 -60
2)
Over-discharge Threshold vs. Temperature
2.540
Over-discharge Threshold VDET2 (V)
-40 -20 0 20 40 60 80 100
Over-charge Threshold VDET1 (V)
2.530 2.520 2.510 2.500 2.490 2.480 2.470 -60
-40
-20
0
20
40
60
80
100
Temperature Topt (C)
Temperature Topt (C)
3)
Excess Current Threshold vs. Temperature
0.210
Excess Current Threshold VDET3 (V)
4)
Short Circuit Protector Threshold vs. Temperature
Short Circuit Protector Threshold Vshort (V)
VDD=3.0(V) 2.40 2.35 2.30 2.25 2.20 2.15 2.10 -60 -40 -20 0 20 40 60 80 100 Temperature Topt (C)
0.205
0.200
0.195
0.190 -60 -40 -20 0 20 40 60 80 100 Temperature Topt (C)
5)
Over-charge Released Voltage vs. Temperature
Over-charge Released Voltage VREL1 (V)
4.070 4.060 4.050 4.040 4.030 4.020 4.010 4.000 -60 -40 -20 0 20 40 60 80 100 Temperature Topt (C)
6)
Over-discharge Released Voltage vs. Temperature (for R5421NxxxF)
Over-charge Released Voltage VREL2 (V)
3.14 3.13 3.12 3.11 3.1 3.09 3.08 3.07 3.06 -60 -40 -20 0 20 40 60 80 100 Temperature Topt (C)
Rev.1.11
- 13 -
7)
Output Delay of Over-charge vs. Temperature
C=0.01(F) VDD=3.6(V)4.3(V)
8)
Output Delay of Over-discharge vs. Temperature
Output Delay of Over-discharge tVDET2 (ms)
VDD=3.6(V)2.2(V) 18 16 14 12 10 8 6 4 2 -60 -40 -20 0 20 40 60 80 100
Output Delay of Over-charge tVDET1 (ms)
100 90 80 70 60 50 40 30 20 -60 -40 -20 0 20 40 60 80 100
Temperature Topt (C)
Temperature Topt (C)
9)
Output delay of Excess current vs. Temperature
Output Delay of Excess Current tVDET3 (ms)
10) Output Delay of Short circuit protector vs. Temperature
Output Delay of Short Circuit Protector tVshort (s)
20 18 16 14 12 10 8 6 4 2 0 -60 -40
VDD=3.0(V)
10
VDD=3.0(V)
8 6
4
2
-20 0 20 40 60 Temperature Topt (C)
80
100
0 -60
-40
-20 0 20 40 60 Temperature Topt (C)
80
100
11) Supply Current vs. Temperature
VDD=3.9(V) 4.0 3.5 Supply Current IDD (A) 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -60 -40 -20 0 20 40 60 80 100 V-=0(V)
Temperature Topt (C)
Rev.1.11
- 14 -
12) Supply Current vs. Temperature(for R5421NxxxC)
0.40 VDD=2.0(V)
12) Standby Current vs. Temperature(for R5421NxxxF)
1.4 VDD=2.0(V)
0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00 -60 -40 -20 0 20 40 60 80 100
Standby Current Istandby (A)
Standby Current Istandby (A)
1.2 1 0.8 0.6 0.4 0.6 0 -60
-40
-20
0
20
40
60
80
100
Temperature Topt (C)
Temperature Topt (C)
13) COUT Nch Driver ON Voltage vs. Temperature
IOL= 50(A)
COUT Nch Driver ON Voltage VOL1 (V)
14) COUT Pch Driver ON Voltage vs. Temperature
ICH= 50(A)
COUT Pch Driver ON Voltage VOH1 (V)
VDD=4.4(V) 3.900 3.850 3.800 3.750 3.700 3.650 3.600 -60
VDD=3.9(V)
0.400 0.350 0.300 0.250 0.200 0.150 0.100 -60
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
Temperature Topt (C)
Temperature Topt (C)
15) DOUT Nch Driver ON Voltage vs. Temperature
IOL= 50(A)
DOUT Nch Driver ON Voltage VOL2 (V)
16) DOUT Pch Driver ON Voltage vs. Temperature
ICH= 50(A) 3.900
DOUT Pch Driver ON Voltage VOH2 (V)
VDD=2.4(V)
VDD=3.9(V)
0.500 0.450 0.400 0.350 0.300 0.250 0.200 0.150 0.100 0.050 -60 -40 -20 0 20 40 60 80 100
3.850 3.800 3.750 3.700 3.650 3.600 -60
-40
-20
0
20
40
60
80
100
Temperature Topt (C)
Temperature Topt (C)
Rev.1.11
- 15 -
17) Output Delay of Over-charge vs. Capacitance C3
VDD=3.8V4.3V(R1=100, C1=0.1F, R2=1k, C2=0.1F) 2
Output Delay of Over-charge (s)
18) Output Delay of Short protection vs. Capacitance C2
R1=100, C1=0.1F, C3=0.01F, R2=1k 10000
1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 0.05 0.1 0.15 0.2 0.25 C3 (F)
Output Delay of Short Protection (s)
1000
100
10
1 0.001
0.01 C2 (F)
0.1
1
19) Output Delay of Excess Current vs. VDD
Output Delay Time of Excess Current tVDET3 (ms)
20) Excess Current Threshold vs. External Resistance R2
0.23
25
Excess Current Threshold VDET3 (V)
V-=0V1V
20
0.22
15
0.21
10
0.20
5
0.19
0 2.5
0
0.5
1
3
3.5
4
4.5
1.5 R2 (k)
2
2.5
3
Supply Voltage VDD (V)
21) Over-charge Threshold vs. External Resistance R1
4.274
Over-chagre Threshold (V)
4.272
4.27
4.268
4.266
4.264 0 200 400 600 R1 () 800 1000
Rev.1.11
- 16 -
s TYPICAL APPLICATION
R1 100 C1 0.1F 5
4 C3 0.01F 6
R5421NxxxC
2
1 C2 0.1F
3 R2 1k
s APPLICATION HINTS
R1 and C1 will stabilize a supply voltage to the R5421NxxxC. A recommended R1 value is less than 1k. A larger value of R1 leads higher detection voltage, makes some errors, because of shoot through current flowed in the R5421NxxxC. R2 and C2 will stabilize a V- pin voltage. The resetting from over-discharge with connecting a charger possibly be disabled by larger value of R2. Recommended value is less than 1 k. After an over-charge detection even connecting battery pack to a system probably could not allow a system to draw load current by a larger R2C2 time constant in the C version. Recommended C2 value is less than 1F. R1 and R2 can operate also as a part of current limit circuit against for setting cell reverse direction or for applying excess charging voltage to the R5421NxxxC, battery pack, while smaller R1 and R2 may cause a power consumption over rating of power dissipation of the R5421NxxxC and a total of 'R1+R2' should be more than 1k. The time constants R1C1 or R2C2 must have a relations as below: R1C1R2C2 Because in case that R1C1, time constant for VDD pin ,would be larger than R2C2, time constant for V- pin, then the R5421NxxxC might be into a standby mode after detecting excess current or short circuit current.
Rev.1.11
- 17 -
s TIMING DIAGRAM
q R5421NXXXC
Discharging Charging Charging Discharging Charging Discharging Charging Open
Excess current
Open
Short circuit
VDET VREL1 VDD VDET
t VDD Vshort VVDET3 VSS
tVDET1 VDD COUT
tVDET1
t
VtVDET2 VDD DOUT tVDET2 tVDET3 tshort t
VSS t
Charging Current 0 t Discharging Current
Rev.1.11
- 18 -
q
R5421NXXXF
Discharging Charging Charging Discharging Open Discharging Charging Open
Excess current Short circuit
Open
VDET1 VREL1
VDD VREL2
VDET t VDD Vshort
V-
VDET3 VSS t
tVDET1 VDD
tVDET1
COUT
VtVDET2 VDD tVDET2 tVDET3 tshort t
DOUT
VSS t
Charging Current 0 t Discharging Current
Rev.1.11
- 19 -

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