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參數資料
| 型號： | R5421N152F-TR |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 電源管理 |
| 英文描述： | Li-lon BATTERY PROTECTOR |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封裝： | SOT-23, 6 PIN |
| 文件頁數： | 1/19頁 |
| 文件大小： | 147K |
| 代理商： | R5421N152F-TR |
’99.9.21
Li-Ion BATTERY PROTECTOR
R5421NxxxC/xxxF series
Rev.1.11
- 1 -
I
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
DD
voltage is coming down to a level lower than “V
REL1
”, or
when a kind of loading is connected to V
DD
after a charger is disconnected from the battery pack while the V
DD
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.
I
FEATURES
Low supply current....................................................Supply current
Typ. 3.0μA
Typ. 0.3μA
(for R5421NxxxC)
Typ. 1.0μA
(for R5421NxxxF)
Standby current (detecting over-discharge)
High accuracy detector threshold..............................Over-charge detector (Topt=25°C)
±25mV
±30 mV
±2.5%
(Topt=0 to 50°C)
Over-discharge detector
Variety of detector threshold .....................................Over-charge detector threshold
4.0V - 4.4V step of 0.005V
2.0V - 3.0V step of 0.005V
0.05V - 0.4V step of 0.005V
±15%
Over-discharge detector threshold
Built-in protection circuit..........................................Excess current protection
Accuracy
Output delay of over-charge......................................Time delay at C3=0.01μF 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
I
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
相關PDF資料 |
PDF描述 |
|---|---|
| R5422N111C | Li-lon BATTERY PROTECTOR |
| R5422N111C-TR | Li-lon BATTERY PROTECTOR |
| R5422N111E | Li-lon BATTERY PROTECTOR |
| R5422N111E-TR | Li-lon BATTERY PROTECTOR |
| R5422N112C | Li-lon BATTERY PROTECTOR |
相關代理商/技術參數 |
參數描述 |
|---|---|
| R5422N111C | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:Li-lon BATTERY PROTECTOR |
| R5422N111C-TR | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:Li-lon BATTERY PROTECTOR |
| R5422N111E | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:Li-lon BATTERY PROTECTOR |
| R5422N111E-TR | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:Li-lon BATTERY PROTECTOR |
| R5422N112C | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:Li-lon BATTERY PROTECTOR |
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