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

’99.9.21

Li-Ion BATTERY PROTECTOR

R5421NxxxC/xxxF series

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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

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

OUT

level

OUT

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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

=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

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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 -

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BLOCK DIAGRAM



R5421NxxxC

Level

Shifter

VD1

Short circuit

Delay

Detector

VD2

VD3



R5421NxxxF

613

OUT

V-

Level

Shifter

VD1

Short circuit

Delay

Detector

VD2

VD3

613

Rev.1.11 - 2 -

OUT

V-

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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)

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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

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PIN DESCRIPTION

Pin No. Symbol Pin description

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

4Ct 5V

OUT

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 -

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ABSOLUTE MAXIMUM RATINGS

VSS=0V

Symbol Item Ratings Unit

Supply voltage -0.3 to 12 V Input Voltage

V-

VCt

V - pin Ct pin

VDD -28 to VDD +0.3

-0.3 to VDD +0.3

V V

Output voltage VC VD

Topt

OUT

-28 to VDD +0.3

-0.3 to VDD +0.3

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 -

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ELECTRICAL CHARACTERISTIC

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R5421N111C Topt=25°C

Symbol Item Conditions MIN. TYP. MAX. Unit

DD1

Vst

DET1

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

Voltage defined as V

- VSS=0V

Over-charge threshold Detect rising edge of supply

- V- ,

1.5 10 V

1.2 V

voltage

REL1

DET1

DET2

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

=3.6V to 4.3V 60 75 90 ms

Detect falling edge of supply voltage

=3.6V to 2.4V 7 10 13 ms

Detect rising edge of 'V-' pin voltage

=3.0V 9 13 17 ms

4.225

4.220

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

Output Delay of Short protection Reset resistance for Excess current protection

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

DD1

Vst

DET1

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

Voltage defined as V

- VSS=0V

Over-charge threshold Detect rising edge of supply

- V- ,

1.5 10 V

1.2 V

Voltage

REL1

DET1

DET2

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

=3.6V to 4.4V 61 77 93 ms

Detect falling edge of supply Voltage

=3.6V to 2.4V 7 10 13 ms

Detect rising edge of 'V-' pin Voltage

=3.0V 9 13 17 ms

4.325

4.320

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

Output Delay of Short protection Reset resistance for excess current protection

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 -

+ 13 hidden pages

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

Specifications and Main Features

Frequently Asked Questions

User Manual