'99.9.21

Li-Ion BATTERY PROTECTOR

R5421NxxxC/xxxF series

Rev.1.11

- 1 -

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 V

DET1

, the output of C

OUT

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 C

OUT

becomes high when the V

voltage is coming down to a level lower than "V

REL1

", or

when a kind of loading is connected to V

after a charger is disconnected from the battery pack while the V

level is in

between "V

DET1

" and "V

REL1

" in the R5421NxxxC/F version.

The output of D

OUT

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 V

DET2

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 D

OUT

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 D

OUT

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 D

OUT

being enabled to low level. Once after detecting excess current, the VD3 is released and D

OUT

level

switches to high by detaching a battery pack from a load system.
Further, short circuit protector makes D

OUT

level to low immediately with external short circuit current and removing external

short circuit leads D

OUT

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 C

OUT

and D

OUT

are CMOS. 6-pin, SOT23-6 is available.

FEATURES

Low supply current....................................................Supply current

Typ. 3.0µA

Standby current (detecting over-discharge)

Typ. 0.3µA
(for R5421NxxxC)
Typ. 1.0µA
(for R5421NxxxF)

High accuracy detector threshold ..............................Over-charge detector (Topt=25°C)

±25mV

(Topt=0 to 50°C)

±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=0.01µF and V

=4.3V

75ms for R5421N111C

Output delay of over-discharge .................................V

=2.4V with built-in capacitor

10ms for R5421N111C/112C

Small package............................................................SOT-23-6 / 6-pin

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

- 3 -

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

Code

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)

PIN CONFIGURATION

(mark side)

PIN DESCRIPTION

Pin No.

Symbol

Pin description

OUT

Output of over-discharge
detection, CMOS output

V-

Pin for charger negative input

OUT

Output of over-charge
detection, CMOS output

Pin for external capacitor
setting output delay of VD1

Power supply

Ground

Rev.1.11

- 4 -

ABSOLUTE MAXIMUM RATINGS

=0V

Symbol

Item

Ratings

Unit

Supply voltage

-0.3 to 12

V-

VCt

Input Voltage
V - pin
Ct pin

-28 to V

+0.3

-0.3 to V

+0.3

V
V

OUT

Output voltage
C

OUT

-28 to V

+0.3

-0.3 to V

+0.3

V
V

Power dissipation

150

Topt

Operating temperature
range

-40 to 85

°C

Tstg

Storage temperature range

-55 to 125

°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

- 5 -

ELECTRICAL CHARACTERISTIC

R5421N111C

Topt=25°C

Symbol

Item

Conditions

MIN.

TYP.

MAX.

Unit

DD1

Operating input voltage

Voltage defined as V

- V

1.5

Vst

Minimum operating
Voltage for 0V charging

Voltage defined as V

- V- ,

- V

=0V

1.2

DET1

Over-charge threshold

Detect rising edge of supply
voltage
(Topt=25°C)
(Topt=0 to 50°C)

*Note

4.225
4.220

4.250
4.250

4.275
4.280

V
V

REL1

Release voltage for over-
charge detection

4.00

4.05

4.10

DET1

Output delay of over-
Charge

C3=0.01µF, V

=3.6V to 4.3V

DET2

Over-discharge threshold

Detect falling edge of supply
voltage

2.437

2.500

2.563

DET2

Output delay of over-
Discharge

=3.6V to 2.4V

DET3

Excess current threshold

Detect rising edge of 'V-' pin
voltage

0.17

0.20

0.23

DET3

Output delay of excess
Current

=3.0V

Vshort

Short protection voltage

=3.0V

-1.2

-0.9

-0.6

tshort

Output Delay of Short
protection

=3.0V

µs

Rshort

Reset resistance for Excess
current protection

=3.6V, V- =1.0V

100

150

Vol1

Nch ON voltage of C

OUT

Iol=50µA, V

=4.4V

0.35

0.5

Voh1

Pch ON voltage of C

OUT

Ioh=-50µA, V

=3.9V

3.4

3.7

Vol2

Nch ON voltage of D

OUT

Iol=50µA, V

=2.4V

0.2

0.5

Voh2

Pch ON voltage of D

OUT

Ioh=-50µA, V

=3.9V

3.4

3.7

Supply current

=3.9V, V- =0V

3.0

6.0

µA

Istandby

Standby current

=2.0V

0.3

0.6

µA

*Note: Considering of variation in process parameters, we compensate for this characteristic related to temperature by laser-

trim, however, this specification is guaranteed by design, not production tested.

Rev.1.11

- 6 -

R5421N112C

Topt=25°C

Symbol

Item

Conditions

MIN.

TYP.

MAX.

Unit

DD1

Operating input voltage

Voltage defined as V

- V

1.5

Vst

Minimum operating
Voltage for 0V charging

Voltage defined as V

- V- ,

- V

=0V

1.2

DET1

Over-charge threshold

Detect rising edge of supply
Voltage
Topt=25°C
Topt=0 to 50°C

*Note

4.325
4.320

4.350
4.350

4.375
4.380

V
V

REL1

Release voltage for over-
charge detection

4.100

4.150

4.200

DET1

Output delay of over-
Charge

C3=0.01µF, V

=3.6V to 4.4V

DET2

Over-discharge threshold

Detect falling edge of supply
Voltage

2.437

2.500

2.563

DET2

Output delay of over-
Discharge

=3.6V to 2.4V

DET3

Excess current threshold

Detect rising edge of 'V-' pin
Voltage

0.17

0.20

0.23

DET3

Output delay of excess
Current

=3.0V

Vshort

Short protection voltage

=3.0V

-1.2

-0.9

-0.6

tshort

Output Delay of Short
protection

=3.0V

µs

Rshort

Reset resistance for excess
current protection

=3.6V, V- =1.0V

100

150

Vol1

Nch ON voltage of C

OUT

Iol=50µA, V

=4.4V

0.35

0.5

Voh1

Pch ON voltage of C

OUT

Ioh=-50µA, V

=3.9V

3.4

3.7

Vol2

Nch ON voltage of D

OUT

Iol=50µA, V

=2.4V

0.2

0.5

Voh2

Pch ON voltage of D

OUT

Ioh=-50µA, V

=3.9V

3.4

3.7

Supply current

=3.9V,V- =0V

3.0

6.0

µA

Istandby

Standby current

=2.0V

0.3

0.6

µA

*Note: Considering of variation in process parameters, we compensate for this characteristic related to temperature by laser-

trim, however this specification is guaranteed by design, not production tested.

Rev.1.11

- 7 -

R5421N151F

Topt=25°C

Symbol

Item

Conditions

MIN.

TYP.

MAX.

Unit

DD1

Operating input voltage

Voltage defined as V

- V

1.5

Vst

Minimum operating
Voltage for 0V charging

Voltage defined as V

- V- ,

- V

=0V

1.2

DET1

Over-charge threshold

Detect rising edge of supply
Voltage
Topt=25°C
Topt=0 to 50°C

*Note

4.225
4.220

4.250
4.250

4.275
4.280

V
V

REL1

Release voltage for over-
charge detection

4.000

4.050

4.100

DET1

Output delay of over-
Charge

C3=0.01µF, V

=3.6V to 4.3V

DET2

Over-discharge threshold

Detect falling edge of supply
Voltage

2.437

2.500

2.563

DET2

Output delay of over-
Discharge

=3.6V to 2.4V

DET3

Excess current threshold

Detect rising edge of 'V-' pin
Voltage

0.17

0.20

0.23

DET3

Output delay of excess
Current

=3.0V

Vshort

Short protection voltage

=3.0V

-1.2

-0.9

-0.6

tshort

Output Delay of Short
protection

=3.0V

µs

Rshort

Reset resistance for excess
current protection

=3.6V, V- =1.0V

100

150

Vol1

Nch ON voltage of C

OUT

Iol=50µA, V

=4.4V

0.35

0.5

Voh1

Pch ON voltage of C

OUT

Ioh=-50µA, V

=3.9V

3.4

3.7

Vol2

Nch ON voltage of D

OUT

Iol=50µA, V

=2.2V

0.2

0.5

Voh2

Pch ON voltage of D

OUT

Ioh=-50µA, V

=3.9V

3.4

3.7

Supply current

=3.9V,V- =0V

3.0

6.0

µA

Istandby

Standby current

=2.0V

1.0

2.0

µA

*Note: Considering of variation in process parameters, we compensate for this characteristic related to temperature by laser-

trim, however, this specification is guaranteed by design, not production tested.

Rev.1.11

- 8 -

R5421N152F

Topt=25°C

Symbol

Item

Conditions

MIN.

TYP.

MAX.

Unit

DD1

Operating input voltage

Voltage defined as V

- V

1.5

Vst

Minimum operating
Voltage for 0V charging

Voltage defined as V

- V- ,

- V

=0V

1.2

DET1

Over-charge threshold

Detect rising edge of supply
Voltage
Topt=25°C
Topt=0 to 50°C

*Note

4.325
4.320

4.350
4.350

4.375
4.380

V
V

REL1

Release voltage for over-
charge detection

4.100

4.150

4.200

DET1

Output delay of over-
Charge

C3=0.01µF, V

=3.6V to 4.4V

DET2

Over-discharge threshold

Detect falling edge of supply
Voltage

2.437

2.500

2.563

DET2

Output delay of over-
Discharge

=3.6V to 2.4V

DET3

Excess current threshold

Detect rising edge of 'V-' pin
Voltage

0.17

0.20

0.23

DET3

Output delay of excess
Current

=3.0V

Vshort

Short protection voltage

=3.0V

-1.2

-0.9

-0.6

tshort

Output Delay of Short
protection

=3.0V

µs

Rshort

Reset resistance for excess
current protection

=3.6V, V- =1.0V

100

150

Vol1

Nch ON voltage of C

OUT

Iol=50µA, V

=4.4V

0.35

0.5

Voh1

Pch ON voltage of C

OUT

Ioh=-50µA, V

=3.9V

3.4

3.7

Vol2

Nch ON voltage of D

OUT

Iol=50µA, V

=2.2V

0.2

0.5

Voh2

Pch ON voltage of D

OUT

Ioh=-50µA, V

=3.9V

3.4

3.7

Supply current

=3.9V,V- =0V

3.0

6.0

µA

Istandby

Standby current

=2.0V

1.0

2.0

µA

*Note: Considering of variation in process parameters, we compensate for this characteristic related to temperature by laser-

trim, however, this specification is guaranteed by design, not production tested.

Rev.1.11

- 9 -

OPERATION

VD1 / Over-Charge Detector in the 'C' version

The VD1 monitors V

pin voltage. When the V

voltage crosses over-charge detector threshold V

DET1

from a low value to

a value higher than the V

DET1

, the VD1 can sense a over-charging and an external charge control Nch-MOS-FET turns to

"OFF" with C

OUT

pin being at "Low" level.

There can be two cases to reset the VD1 making the C

OUT

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 V

voltage is coming down to a level lower than "V

REL1

While in the second case, connecting a kind of loading to V

after disconnecting a charger from the battery pack can make

the VD1 resetting when the V

level is in between "V

DET1

" and "V

REL1"

After detecting over-charge with the V

voltage of higher than V

DET1

, connecting system load to the battery pack makes

load current allowable through parasitic diode of external charge control FET.
The C

OUT

level would be High when the V

level is coming down to a level below the V

DET1

by continuous drawing of load

current.

An output delay time for over-charge detection can be set by external capacitor C3 connecting between the V

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 V

level is going up to a higher level than V

DET1

if the V

voltage would be back to a level lower than the V

DET1

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:

DET1

[sec] = (C3[F]

[V]-0.7) / (0.48

-6

)

Note:Topt=25°C V

value should be after over-charge detection.

A level shifter incorporated in a buffer driver for the C

OUT

pin makes the "Low" level of C

OUT

pin to the V - pin voltage and

the "High" level of C

OUT

pin is set to V

voltage with CMOS buffer.

VD2 / Over-Discharge Detector

The VD2 is monitoring a V

pin voltage. When the V

voltage crosses the over-discharge detector threshold V

DET2

from a

high value to a value lower than the V

DET2

, the VD2 can sense an over-discharging and the external discharge control Nch

MOS FET turns to "OFF" with the D

OUT

pin being at "Low" level.

To reset the VD2 with the D

OUT

pin level being "H" again after detecting over-discharge it is necessary to connect a charger

to the battery pack for R5421NxxxC. When the V

voltage stays under over- discharge detector threshold V

DET2

charge

current can flow through parasitic diode of external discharge control MOS FET, then after the V

voltage comes up to a

value larger than V

DET2,

OUT

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 D

OUT

level being "H" instantaneously when the V

voltage is higher

than V

DET2

Besides, for R5421NxxxF, when a cell voltage reaches equal or more than over-discharge released voltage, or V

REL2

, over-

discharge 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, tV

DET2

=10ms typ. at V

=2.4V. When the V

level

is going down to a lower level than V

DET2

if the V

voltage would be back to a level higher than the V

DET2

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 0.3µA(for R5421NxxxC) or
1.0

A(for R5421NxxxF) at V

=2.0V and into standby, only the charger detector is operating.

The output type of D

OUT

pin is CMOS having "H" level of V

and "L" level of V

Rev.1.11

- 10 -

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 /V

and excess current

threshold V

DET3

, 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 D

OUT

being at "Low" level.

An output delay time for the excess current detector is internally fixed, 13ms typ. at V

=3.0V.

A quick recovery of V- pin level from a value between Vshort and V

DET3

within the delay time keeps the discharge control

FET staying "High" state.
When the short circuit protector is enabled ,the D

OUT

would be Low and its delay time would be 5µs typ.

The V - pin has a built-in pulled down resistor ,typ.100k

, with connecting to the V

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 V

level

through pulled down resistor built-in internally.

If V

voltage would be higher than V

DET2

at a time when the excess current is detected the R5421NxxxC does not enter a

standby mode, or otherwise in case of lower V

voltage than V

DET2

would lead the R5421NxxxC into a standby.

After detecting short circuit the R5421NxxxC will not enter a standby mode.

Rev.1.11

- 13 -

TYPICAL CHARACTERISTICS

Over-charge Threshold vs. Temperature

Over-discharge Threshold vs. Temperature

4.200

4.210

4.220

4.230

4.240

4.250

4.260

4.270

Temperature Topt (

-40

-20

100

-60

er-charge Threshold V

DET1

(V)

2.470

2.480

2.490

2.500

2.510

2.520

2.530

2.540

Temperature Topt (

-40

-20

100

-60

er-discharge Threshold V

DET2

(V)

Excess Current Threshold vs. Temperature

Short Circuit Protector Threshold vs. Temperature

0.190

0.195

0.200

0.205

0.210

Temperature Topt (

-40

-20

100

-60

Excess

Current Threshold V

DET3

(V)

2.10

2.15

2.20

2.25

2.35

2.30

2.40

Temperature Topt (

-40

-20

100

-60

Shor

t Circuit Protector

Threshold

Vshor

t (V)

=3.0(V)

Over-charge Released Voltage vs. Temperature

Over-discharge Released Voltage vs. Temperature
(for R5421NxxxF)

4.000

4.010

4.020

4.030

4.040

4.050

4.060

4.070

Temperature Topt (

-40

-20

100

-60

er-charge

Released V

oltage V

REL1

(V)

3.06

3.07

3.08

3.09

3.1

3.11

3.12

3.14

3.13

-40

-20

100

-60

Temperature Topt (

er-charge

Released V

oltage V

REL2

(V)

Rev.1.11

- 14 -

Output Delay of Over-charge vs. Temperature

Output Delay of Over-discharge vs. Temperature

100

C=0.01(

F) V

=3.6(V)

4.3(V)

Temperature Topt (

-40

-20

100

-60

Output Dela

y of Ov

er-charge tV

DET1

(ms)

=3.6(V)

2.2(V)

Temperature Topt (

-40

-20

100

-60

Output Dela

y of Ov

er-discharge tV

DET2

(ms)

Output delay of Excess current vs. Temperature

10) Output Delay of Short circuit protector vs. Temperature

=3.0(V)

Temperature Topt (

-40

-20

100

-60

Output Dela

y of Excess Current tV

DET3

(ms)

=3.0(V)

Temperature Topt (

-40

-20

100

-60

Output Dela

y of Shor

t Circuit Protector tVshor

t (

11) Supply Current vs. Temperature

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

=3.9(V) V-=0(V)

Temperature Topt (

-40

-20

100

-60

Supply Current I

(

Rev.1.11

- 15 -

12) Supply Current vs. Temperature(for R5421NxxxC)

12) Standby Current vs. Temperature(for R5421NxxxF)

Standb

y Current Istandb

y (

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

=2.0(V)

Temperature Topt (

-40

-20

100

-60

0.6

0.4

0.6

0.8

1.2

1.4

=2.0(V)

-40

-20

100

-60

Standb

y Current Istandb

y (

Temperature Topt (

13) C

OUT

Nch Driver ON Voltage vs. Temperature

14) C

OUT

Pch Driver ON Voltage vs. Temperature

= 50(

A) V

=4.4(V)

0.300

0.350

0.400

0.250

0.150

0.200

0.100

Temperature Topt (

-60

-40

100

-20

OUT

Nch Dr

er ON

oltage

OL1

(V)

= 50(

A) V

=3.9(V)

3.800

3.850

3.900

3.750

3.650

3.700

3.600

Temperature Topt (

-60

-40

100

-20

OUT

Pch Dr

er ON

oltage V

OH1

(V)

15) D

OUT

Nch Driver ON Voltage vs. Temperature

16) D

OUT

Pch Driver ON Voltage vs. Temperature

= 50(

A) V

=2.4(V)

0.350

0.400

0.450

0.500

0.300

0.250

0.100

0.150

0.200

0.050

Temperature Topt (

-60

-40

100

-20

OUT

Nch Dr

er ON

oltage V

OL2

(V)

= 50(

A) V

=3.9(V)

3.800

3.850

3.900

3.750

3.650

3.700

3.600

-60

-40

100

-20

OUT

Pch Dr

er ON

oltage

OH2

(V)

Temperature Topt (

Rev.1.11

- 16 -

17) Output Delay of Over-charge vs. Capacitance C3

18) Output Delay of Short protection vs. Capacitance C2

=3.8V

4.3V(R1=100

, C1=0.1

F, R2=1k

, C2=0.1

1.4

1.2

1.8

1.6

0.8

0.6

0.2

0.4

C3 (

0.1

0.05

0.2

0.25

0.15

Output Dela

y of Ov

er-charge (s)

10000

1000

100

C2 (

R1=100

, C1=0.1

F, C3=0.01

F, R2=1k

0.001

0.1

0.01

Output Dela

y of Shor

t Protection (

19) Output Delay of Excess Current vs. V

20) Excess Current Threshold vs. External Resistance R2

V-=0V

Supply Voltage V

(V)

4.5

3.5

2.5

Output Dela

Time of Excess Current tV

DET3

(ms)

0.19

0.20

0.21

0.23

0.22

R2 (k

)

0.5

2.5

1.5

Excess

Current Threshold V

DET3

(V)

21) Over-charge Threshold vs. External Resistance R1

R1 (

)

er-chag

re Threshold

(V)

4.264

4.266

4.268

4.27

4.274

4.272

600

200

400

1000

800

Rev.1.11

- 17 -

TYPICAL APPLICATION

R5421NxxxC

R1
100

R2
1k

0.01

0.1

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 1µF.
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:

R1C1

R2C2

Because in case that R1C1, time constant for V

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.

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