Datasheet R5421N111C-TR, R5421N112C-TR, R5421N151F-TR, R5421N152F-TR Datasheet (RICOH)

’99.9.21

Li-Ion BATTERY PROTECTOR

R5421NxxxC/xxxF series

■

OUTLINE

The R5421NxxxC/F Series are protection ICs for over-charge/discharge of rechargeab le 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
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
when a kind of loading is connected to V
between “V

DET1

The output of D

” and “V

OUT

REL1

” in the R5421NxxxC/F version.

pin, the output of over-discharge detector/VD2, switche s 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

OUT

becomes high when the VDD voltage is coming down to a level lower than “V

DD

after a charger is disconnected from the battery pack while the VDD level is in

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

“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

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

OUT

short circuit leads D

level to high. After detecting over-discharge, supply current will be kept extremely low by halt some

OUT

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

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.

REL1

”, or

becomes

becomes

OUT

level

OUT

■

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

(To pt = 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=0.01µ F and V

DD

=4.3V

75ms for R5421N111C



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

DD

=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 - 1 -

■

BLOCK DIAGRAM



R5421NxxxC

V

DD

5

Ct

4

Level

Shifter

VD1

Short circuit

Delay

Detector

VD2

VD3



R5421NxxxF

613

V

SS

V

DD

5

Ct

4

D

OUT

C

OUT

2

V-

Level

Shifter

VD1

Short circuit

Delay

Detector

VD2

VD3

613

V

SS

Rev.1.11 - 2 -

OUT

C

OUT

V-

D

2

■

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

Code Description

a
b Designation of ver sio n symb o ls

c Taping Type: TR (refer to Taping Specification)

■

PIN CONFIGURATION

←Part Number

↑↑↑

abc

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.

654

(mark side)

123

■

PIN DESCRIPTION

Pin No. Symbol Pin description

1D
2 V- Pin for charger ne gative input
3C

4Ct
5V

6V

OUT

OUT

DD

SS

Output of over-discharge
detection, CMOS output

Output of over-charge
detection, CMOS output
Pin for external capacitor
setting output delay of VD1
Power supply
Ground

Rev.1.11 - 3 -

■

ABSOLUTE MAXIMUM RATINGS

VSS=0V

Symbol Item Ratings Unit

DD

V

Supply voltage -0.3 to 12 V
Input Voltage

V-

VCt

V - pin
Ct pin

VDD -28 to VDD +0.3

SS

-0.3 to VDD +0.3

V

V
V

Output voltage
VC
VD

Topt

OUT

OUT

D

P

OUT

pin

C

OUT

D

pin

DD

-28 to VDD +0.3

V

SS

V

-0.3 to VDD +0.3

V

V
Power dissipation 150 mW
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 - 4 -

■

ELECTRICAL CHARACTERISTIC

●

R5421N111C Topt=25°C

Symbol Item Conditions MIN. TYP. MAX. Unit

V

V

DD1

Vst

DET1

Operating input voltage Voltage defined as VDD - V
Minimum operating
Voltage for 0V charging

Voltage defined as V

DD

V

- VSS=0V

Over-charge threshold Detect rising edge of supply

DD

SS

- V- ,

1.5 10 V

1.2 V

voltage

V

tV

V

tV

V

tV

REL1

DET1

DET2

DET2

DET3

DET3

Release voltage for over­charge detection
Output delay of over­Charge

Over-discharge threshold
Output delay of over-

Discharge
Excess current threshold
Output delay of excess

Current

(Topt=25°C)
(To pt =0 to 50°C )

C3=0.01µF, V

*Note

DD

=3.6V to 4.3V 60 75 90 ms

Detect falling edge of supply
voltage

DD

V

=3.6V to 2.4V 7 10 13 ms

Detect rising edge of 'V-' pin
voltage

DD

V

=3.0V 9 13 17 ms

4.225

4.220

4.250

4.250

4.275

4.280

4.00 4.05 4.10 V

2.437 2.500 2.563 V

0.17 0.20 0.23 V

V
V

Vshort Short protection voltage VDD=3.0V VDD-1.2 VDD-0.9 VDD-0.6 V

tshort

Rshort

Vol1 Nch ON voltage of C

Voh1 Pch ON voltage of C

Vol2 Nch ON voltage of D

Voh2 Pch ON voltage of D

DD

I

Output Delay of Short
protection
Reset resistance for Excess
current protection

OUT

OUT

OUT

OUT

VDD=3.0V 5 50 µs

VDD=3.6V, V- =1.0V 50 100 150

kΩ

Iol=50µA, VDD=4.4V 0.35 0.5 V
Ioh=-50µA, VDD=3.9V 3.4 3.7 V
Iol=50µA, VDD=2.4V 0.2 0.5 V
Ioh=-50µA, VDD=3.9V 3.4 3.7 V

Supply current VDD=3.9V, V- =0V 3.0 6.0 µA

Istandby Standby current VDD=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 - 5 -

●

R5421N112C Topt=25°C

Symbol Item Conditions MIN. TYP. MAX. Unit

V

V

DD1

Vst

DET1

Operating input voltage Voltage defined as VDD - V
Minimum operating
Voltage for 0V charging

Voltage defined as V

DD

V

- VSS=0V

Over-charge threshold Detect rising edge of supply

DD

SS

- V- ,

1.5 10 V

1.2 V

Voltage

V

tV

V

tV

V

tV

REL1

DET1

DET2

DET2

DET3

DET3

Release voltage for over­charge detection
Output delay of over­Charge

Over-discharge threshold
Output delay of over-

Discharge
Excess current threshold
Output delay of excess

Current

Topt=25°C
Topt=0 to 50°C

C3=0.01µF, V

*Note

DD

=3.6V to 4.4V 61 77 93 ms

Detect falling edge of supply
Voltage

DD

V

=3.6V to 2.4V 7 10 13 ms

Detect rising edge of 'V-' pin
Voltage

DD

V

=3.0V 9 13 17 ms

4.325

4.320

4.350

4.350

4.375

4.380

4.100 4.150 4.200 V

2.437 2.500 2.563 V

0.17 0.20 0.23 V

V
V

Vshort Short protection voltage VDD=3.0V VDD-1.2 VDD-0.9 VDD-0.6 V

tshort

Rshort

Vol1 Nch ON voltage of C

Voh1 Pch ON voltage of C

Vol2 Nch ON voltage of D

Voh2 Pch ON voltage of D

DD

I

Output Delay of Short
protection
Reset resistance for excess
current protection

OUT

OUT

OUT

OUT

VDD=3.0V 5 50 µs

VDD=3.6V, V- =1.0V 50 100 150

kΩ

Iol=50µA, VDD=4.4V 0.35 0.5 V
Ioh=-50µA, VDD=3.9V 3.4 3.7 V
Iol=50µA, VDD=2.4V 0.2 0.5 V
Ioh=-50µA, VDD=3.9V 3.4 3.7 V

Supply current VDD=3.9V,V- =0V 3.0 6.0 µA

Istandby Standby current VDD=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 b y design, not production tested.

Rev.1.11 - 6 -

●

R5421N151F Topt=25°C

Symbol Item Conditions MIN. TYP. MAX. Unit

V

V

DD1

Vst

DET1

Operating input voltage Voltage defined as VDD - V
Minimum operating
Voltage for 0V charging

Voltage defined as V

DD

V

- VSS=0V

Over-charge threshold Detect rising edge of supply

DD

SS

- V- ,

1.5 10 V

1.2 V

Voltage

V

tV

V

tV

V

tV

REL1

DET1

DET2

DET2

DET3

DET3

Release voltage for over­charge detection
Output delay of over­Charge

Over-discharge threshold
Output delay of over-

Discharge
Excess current threshold
Output delay of excess

Current

Topt=25°C
Topt=0 to 50°C

C3=0.01µF, V

*Note

DD

=3.6V to 4.3V 60 75 90 ms

Detect falling edge of supply
Voltage

DD

V

=3.6V to 2.4V 7 10 13 ms

Detect rising edge of 'V-' pin
Voltage

DD

V

=3.0V 9 13 17 ms

4.225

4.220

4.250

4.250

4.275

4.280

4.000 4.050 4.100 V

2.437 2.500 2.563 V

0.17 0.20 0.23 V

V
V

Vshort Short protection voltage VDD=3.0V VDD-1.2 VDD-0.9 VDD-0.6 V

tshort

Rshort

Vol1 Nch ON voltage of C

Voh1 Pch ON voltage of C

Vol2 Nch ON voltage of D

Voh2 Pch ON voltage of D

DD

I

Output Delay of Short
protection
Reset resistance for excess
current protection

OUT

OUT

OUT

OUT

VDD=3.0V 5 50 µs

VDD=3.6V, V- =1.0V 50 100 150

kΩ

Iol=50µA, VDD=4.4V 0.35 0.5 V
Ioh=-50µA, VDD=3.9V 3.4 3.7 V
Iol=50µA, VDD=2.2V 0.2 0.5 V
Ioh=-50µA, VDD=3.9V 3.4 3.7 V

Supply current VDD=3.9V,V- =0V 3.0 6.0 µA

Istandby Standby current VDD=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 g uaranteed by design, not production tested.

Rev.1.11 - 7 -

●

R5421N152F Topt=25°C

Symbol Item Conditions MIN. TYP. MAX. Unit

V

V

DD1

Vst

DET1

Operating input voltage Voltage defined as VDD - V
Minimum operating
Voltage for 0V charging

Voltage defined as V

DD

V

- VSS=0V

Over-charge threshold Detect rising edge of supply

DD

SS

- V- ,

1.5 10 V

1.2 V

Voltage

V

tV

V

tV

V

tV

REL1

DET1

DET2

DET2

DET3

DET3

Release voltage for over­charge detection
Output delay of over­Charge

Over-discharge threshold
Output delay of over-

Discharge
Excess current threshold
Output delay of excess

Current

Topt=25°C
Topt=0 to 50°C

C3=0.01µF, V

*Note

DD

=3.6V to 4.4V 61 77 93 ms

Detect falling edge of supply
Voltage

DD

V

=3.6V to 2.4V 7 10 13 ms

Detect rising edge of 'V-' pin
Voltage

DD

V

=3.0V 9 13 17 ms

4.325

4.320

4.350

4.350

4.375

4.380

4.100 4.150 4.200 V

2.437 2.500 2.563 V

0.17 0.20 0.23 V

V
V

Vshort Short protection voltage VDD=3.0V VDD-1.2 VDD-0.9 VDD-0.6 V

tshort

Rshort

Vol1 Nch ON voltage of C

Voh1 Pch ON voltage of C

Vol2 Nch ON voltage of D

Voh2 Pch ON voltage of D

DD

I

Output Delay of Short
protection
Reset resistance for excess
current protection

OUT

OUT

OUT

OUT

VDD=3.0V 5 50 µs

VDD=3.6V, V- =1.0V 50 100 150

kΩ

Iol=50µA, VDD=4.4V 0.35 0.5 V
Ioh=-50µA, VDD=3.9V 3.4 3.7 V
Iol=50µA, VDD=2.2V 0.2 0.5 V
Ioh=-50µA, VDD=3.9V 3.4 3.7 V

Supply current VDD=3.9V,V- =0V 3.0 6.0 µA

Istandby Standby current VDD=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 g uaranteed by design, not production tested.

Rev.1.11 - 8 -

■

OPERATION

●

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

DD

The VD1 monitors V
a value higher than the V
“OFF” with C

OUT

pin voltage. When the VDD voltage crosses over-charge detector threshold V

DET1

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

pin being at “Low” level.

DET1

from a low value to

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

OUT

pin level to “High” again after de tecting 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
While in the second case, connecting a kind of loading to V

DD

the VD1 resetting when the V

level is in between “V

After detecting over-charge with the V

DD

voltage of hi gher than V

DET1

DD

voltage is coming down to a level lo wer than “V

DD

after disconnecting a charger from the battery pack can make

” and “V

REL1”

.

DET1

, connecting system load to the battery pack makes

REL1

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

OUT

level would be High when the VDD 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

SS

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

DD

level is going up to a higher level than V

DET1

if the VDD voltage would be back to a level lower than the V
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] × (VDD[V]-0.7) / (0.48 × 10-6)

tV

DD

Note:Topt=25°C V
A level shifter incorporated in a buffer driver for the C
the “High” level of C

●

VD2 / Over-Discharge Detector

The VD2 is monitoring a V
high value to a value lower than the V
MOS FET turns to “OFF” with the D

value should be after over-charge detection.

OUT

pin makes the “Low” level of C

OUT

pin is set to VDD voltage with CMOS buffer.

DD

pin voltage. When the VDD voltage crosses the over-discharge detector threshold V

DET2

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

OUT

pin being at “Low” level.

OUT

pin to the V - pin vo ltage and

”.

DET2

DET1

from a

OUT

To reset the VD2 with the D
to the battery pack for R5421NxxxC. When the V
current can flow through parasitic diode of exter nal discharge co ntrol MOS FET, then after the V
value larger than V

DET2,

D

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

DD

voltage stays under over- discharge detector threshold V

DD

voltage comes up to a

OUT

becomes "H" and discharging process would be able to advance through ON state MOS FET

DET2

charge

for discharge control.
Connecting a charger to the battery pack makes the D

DET2

than V

.

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

OUT

level being “H” instantaneousl y when the VDD voltage is higher

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
is going down to a lower level than V

DET2

if the VDD voltage would be back to a level higher than the V

DET2

=10ms typ. at VDD=2.4V. When the VDD level

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

DD

1.0µA(for R5421NxxxF) at V

OUT

The output type of D

pin is CMOS having “H” level of VDD and “L” level of VSS.

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

Rev.1.11 - 9 -

●

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.

DD

When the V- pin vo ltage is going up to a value betwee n the short pro t ection voltage Vshort /V

DET3

threshold V

, the excess current detector operates and further soaring of V- pin voltage higher than Vshort makes the

and excess current

short circuit protector enabled. This leads the external discharge control Nch MOS FET turns to “OFF” with the D
being at “Low” level.

DD

An output delay time for the excess current detector is internally fixed, 13ms typ. at V
A quick recovery of V- pin level from a value between Vshort and V

DET3

within the delay time keeps the discharge control

=3.0V.

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

The V - pin has a built-in pulled down resistor ,typ.100kΩ, with connecting to the V

OUT

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

SS

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 le vel being down to the V
through pulled down resistor built-in internally.

OUT

SS

pin

level

DD

If V

voltage would be higher than V

standby mode, or otherwise in case of lower V

DET2

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

DD

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 - 10 -

■

TEST CIRCUITS

5

4

V

2

3

6

0.01µF

V

5

2

6

1

Test Circuit 1 Test Circuit 2

5

2

A

V

6

1

5

50µA

2

6

3

V

Test Circuit 3 Test Circuit 4

50µA

5

5

1

50µA

2

6

3

V

2

6

V

Test Circuit 5 Test Circuit 6

Rev.1.11 - 11 -

50µA

5

1

A

5

2

6

V

Test Circuit 7 Test Circuit 8

R1

5

3

C1

V

2

6

C3

1

Test Circuit 9 Test Circuit 10

The typical characteristics were obtained by use of these test circuits.

Test Circuit 1 : Typical Characteristics 1) 5) 7) 17)
Test Circuit 2 : Typical Characteristics 2) 6) 8)
Test Circuit 3 : Typical Characteristics 3) 4) 9) 10) 19)
Test Circuit 4 : Typical Characteristics 13)
Test Circuit 5 : Typical Characteristics 14)
Test Circuit 6 : Typical Characteristics 15)
Test Circuit 7 : Typical Characteristics 16)
Test Circuit 8 : Typical Characteristics 11) 12)
Test Circuit 9 : Typical Characteristics 21)
Test Circuit 10 : Typical Characteristics 18) 20)

2

6

5

R2

2

V

C2

6

1

Rev.1.11 - 12 -

■

TYPICAL CHARACTERISTICS

1) Over-charge Threshold vs. Temperature 2) Over-discharge Threshold vs. T emperature

(V)

DET1

4.270

4.260

4.250

(V)

DET2

2.540

2.530

2.520

4.240

4.230

4.220

4.210

Over-charge Threshold V

4.200
6040-40 -20 0 1008020-60

T emperature Topt (°C)

2.510

2.500

2.490

2.480

Over-discharge Threshold V

2.470
6040-40 -20 0 1008020-60

T emperature Topt (°C)

3) Excess Current Threshold vs. Temperature 4) Short Circuit Protector Threshold vs. Temperature

0.210

(V)

DET3

0.205

0.200

0.195

Excess Current Threshold V

0.190

T emperature Topt (°C)

2.40

2.35

2.30

2.25

2.20

2.15

6040-40 -20 0 1008020-60

Short Circuit Protector Threshold Vshort (V)

2.10

T emperature Topt (°C)

VDD=3.0(V)

6040-40 -20 0 1008020-60

5) Over-charge Released Voltage vs. Temperature 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
6040-40 -20 0 1008020-60

T emperature Topt (°C)

4.070

(V)

4.060

REL1

4.050

4.040

4.030

4.020

4.010

Over-charge Released Voltage V

4.000
6040-40 -20 0 1008020-60

T emperature Topt (°C)

Rev.1.11 - 13 -

7) Output Delay of Over-charge vs. Temperature 8) Output Delay of Over-discharge vs. Temperature

100

(ms)

90

DET1

80
70
60
50
40
30

Output Delay of Over-charge tV

20

C=0.01(µF) V

T emperature Topt (°C)

DD

=3.6(V)→4.3(V)

6040-40 -20 0 1008020-60

18

(ms)

16

DET2

14
12
10

8
6
4
2

Output Delay of Over-discharge tV

V

DD

=3.6(V)→2.2(V)

T emperature Topt (°C)

6040-40 -20 0 1008020-60

9) Output delay of Excess current vs. Temperature 10) Output Delay of Short circuit protector vs. Temperature

DD

=3.0(V)

20

(ms)

18

DET3

16
14
12

10

8
6

4
2
0

Output Delay of Excess Current tV

T emperature Topt (°C)

V

10

8

6

4

2

6040-40 -20 0 1008020-60

0

Output Delay of Short Circuit Protector tVshort (µs)

T emperature Topt (°C)

V

DD

=3.0(V)

6040-40 -20 0 1008020-60

11) Supply Current vs. Temperature

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

4.0

3.5

3.0

2.5

2.0

1.5

1.0

Supply Current IDD (µA)

0.5

0.0

T emperature Topt (°C)

V

6040-40 -20 0 1008020-60

Rev.1.11 - 14 -

12) Supply Current vs. Temperature(for R5421NxxxC) 12) Standby Current vs. Temperature(for R5421NxxxF)

V

DD

=2.0(V)

6040-40 -20 0 1008020-60

Standby Current Istandby (µA)

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0.00

T emperature Topt (°C)

V

6040-40 -20 0 1008020-60

DD

=2.0(V)

1.4

1.2

1

0.8

0.6

0.4

Standby Current Istandby (µA)

0.6
0

T emperature Topt (°C)

13) C

15) D

OUT

Nch Driver ON Voltage vs. Temperature 14) C

IOL= 50(µA) VDD=4.4(V)

0.400

(V)

OL1

0.350

0.300

0.250

0.200

0.150

Nch Driver ON Voltage V

OUT

0.100

C

-60 -40 20 40 60 80 100-20 0
T emperature Topt (°C)

OUT

Nch Driver ON Voltage vs. Temperature 16) D

IOL= 50(µA) VDD=2.4(V)

0.500

(V)

0.450

OL2

0.400

0.350

0.300

0.250

0.200

0.150

Nch Driver ON Voltage V

0.100

OUT

D

0.050

-60 -40 20 40 60 80 100-20 0
T emperature Topt (°C)

OUT

Pch Driver ON Voltage vs. Temperature

ICH= 50(µA) VDD=3.9(V)

3.900

(V)

OH1

3.850

3.800

3.750

3.700

3.650

Pch Driver ON Voltage V

OUT

3.600

C

-60 -40 20 40 60 80 100-20 0
T emperature Topt (°C)

OUT

Pch Driver ON Voltage vs. Temperature

ICH= 50(µA) VDD=3.9(V)

3.900

(V)

3.850

OH2

3.800

3.750

3.700

Pch Driver ON Voltage V

3.650

OUT

D

3.600

-60 -40 20 40 60 80 100-20 0
T emperature Topt (°C)

Rev.1.11 - 15 -

17) Output Delay of Over-charge vs. Capacitance C3 18) Output Delay of Short protection vs. Capacitance C2

VDD=3.8V→4.3V(R1=100Ω, C1=0.1µF, R2=1kΩ, C2=0.1µF)

2

1.8

1.6

1.4

1.2
1

0.8

0.6

0.4

Output Delay of Over-charge (s)

0.2
0

0 0.10.05 0.2 0.250.15

C3 (µF)

R1=100Ω, C1=0.1µF, C3=0.01µF, R2=1kΩ

10000

1000

100

10

1

Output Delay of Short Protection (µs)

0.001 0.10.01 1
C2 (µF)

V-=0V→1V

DD

(V)

DD

43 4.53.52.5

19) Output Delay of Excess Current vs. V

(ms)

25

DET3

20

15

10

5

0

Output Delay Time of Excess Current tV

Supply Voltage V

21) Over-charge Threshold vs. External Resistance R1

4.274

4.272

4.27

20) Excess Current Threshold vs. External Resistance R2

0.23

(V)

DET3

0.22

0.21

0.20

Excess Current Threshold V

0.19

R2 (kΩ)

20.5 1 32.51.50

4.268

4.266

Over-chagre Threshold (V)

4.264
600200 400 10008000

R1 (Ω)

Rev.1.11 - 16 -

■

TYPICAL APPLICATION

R1
100Ω

C1

0.1µF

C3

0.01µF

■

APPLICATION HINTS

R1 and C1 will stabilize a supply voltage to the R5421NxxxC. A recommended R1 value is less than 1kΩ.
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 kΩ.
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 1kΩ.
The time constants R1C1 or R2C2 must have a relations as below:

R1C1≤R2C2

DD

Because in case that R1C1, time constant for V
R5421NxxxC might be into a standby mode after detecting excess current or short circuit current.

pin ,would be larger than R2C2, time constant for V- pin, then the

5

4

R5421NxxxC

6

C2

0.1µF

2

1

3

R2
1kΩ

Rev.1.11 - 17 -

■

TIMING DIAGRAM

●

R5421NXXXC

V

DET

V

REL1

V

DD

V

DET

V

DD

Vshort

V-

DET3

V

V

SS

Charging Charging

Discharging Discharging

Charging ChargingDischarging

Open Open

Excess
current

Short
circuit

t

V

DD

C

OUT

V

DD

D

OUT

V

SS

Charging
Current

Discharging
Current

tV

DET1

tV

DET1

t

V-

tV

DET2

tV

DET2

tV

DET3

tshort

t

t

0

t

Rev.1.11 - 18 -

●

R5421NXXXF

V
V

V

DD

V

Vshort

V-

V

DET1
REL1

REL2

V

V

DET3

V

Charging Charging

Discharging

DET

DD

SS

Discharging Discharging

Open

Charging

Excess
current

Open

Short

circuit

Open

t

V

DD

C

OUT

V-

V

DD

D

OUT

V

SS

Charging
Current

Discharging
Current

DET1

tV

tV

DET1

tV

DET2

tV

DET2

tV

DET3

tshort

t

t

t

0

t

Rev.1.11 - 19 -