R5421N152F RICOH Co.,Ltd., R5421N152F Datasheet

R5421N152F

Manufacturer Part Number

R5421N152F

Description

Manufacturer

RICOH Co.,Ltd.

Datasheets

1.R5421N152F.pdf (19 pages)

2.R5421N152F.pdf (19 pages)

3.R5421N152F.pdf (19 pages)

Specifications of R5421N152F

Date_code

03+

Packing_info

SOT-163

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Current page: 1 of 19
Download datasheet (148Kb)

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

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

The output of D

passed, when discharging voltage crosses the detector threshold from a high value to a value lower than V

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

“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

“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

switches to high by detaching a battery pack from a load system.

Further, short circuit protector makes D

short circuit leads D

internal circuits operation. The output delay of over-charge detectors can be set by connecting external capacitors. Output type

of C

Rev.1.11

OUTLINE

FEATURES

APPLICATIONS

OUT

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

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

Variety of detector threshold .....................................Over-charge detector threshold

Built-in protection circuit ..........................................Excess current protection

Output delay of over-charge ......................................Time delay at C3=0.01µF and V

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

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

Li+ one-cell protector for battery pack

High precision protectors for cell-phones and any other gadgets using on board Li+ one-cell battery

and D

DET1

OUT

” and “V

OUT

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

pin, the output of over-discharge detector/VD2, switches to low level after internally fixed delay time

OUT

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

REL1

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

” in the R5421NxxxC/F version.

OUT

becomes high when the V

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

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

Standby current (detecting over-discharge)

Over-discharge detector

Over-discharge detector threshold

Accuracy

=2.4V with built-in capacitor

- 1 -

Li-Ion BATTERY PROTECTOR

R5421NxxxC/xxxF series

voltage is coming down to a level lower than “V

(Topt=0 to 50°C)

=4.3V

2.0V - 3.0V step of 0.005V

75ms for R5421N111C

10ms for R5421N111C/112C

4.0V - 4.4V step of 0.005V

0.05V - 0.4V step of 0.005V

DET1

DET2

Typ. 3.0µA

(for R5421NxxxC)

Typ. 1.0µA

(for R5421NxxxF)

±25mV

±30 mV

±2.5%

±15%

Typ. 0.3µA

, the output of C

level is in

OUT

’99.9.21

OUT

becomes

REL1

level

”, or

OUT

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