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R5478N187CD Schematic ( PDF Datasheet ) - RICOH

Teilenummer R5478N187CD
Beschreibung Li-ION/POLYMER 1CELL PROTECTOR
Hersteller RICOH
Logo RICOH Logo 




Gesamt 27 Seiten
R5478N187CD Datasheet, Funktion
Li-ION/POLYMER 1CELL PROTECTOR
R5475N/R5478N SERIES
No. EA-291-121009
OUTLINE
The R5475N/R5478Nxxxxx Series are high voltage CMOS-based protection ICs for over-charge/discharge of
rechargeable one-cell Lithium-ion (Li+) / Lithium polymer excess load current, further include a short circuit
protector for preventing large external short circuit current and Excess discharge-current.
Each of these ICs is composed of three voltage detectors, a reference unit, a delay circuit, a short circuit
protector, an oscillator, a counter, and a logic circuit. When the over-charge voltage crosses the detector
threshold from a low value to a high value, the output of COUT pin switches to low level after internal fixed delay
time. The conditions to release over-charge detector are different by mask options. In terms of so called “Latch
function” version, after detecting over-charge, the detector can be reset and the output of COUT becomes "H"
when a kind of load is connected to VDD after a charger is disconnected from the battery pack, and the cell
voltage becomes lower than over-charge detector threshold. If a charger is continue to be connected to the
battery pack, even the cell voltage becomes lower than over-charge detector threshold, over-charge state is not
released. On the other hand, in terms of so called, “ Released by voltage level” version, after detecting
over-charge, when the cell voltage reaches the released voltage from over-charge, the output of COUT becomes
“H”
The output of DOUT pin, the output of Over-discharge detector and Excess discharge-current detector,
switches to “L” level after internally fixed delay time, when discharged voltage crosses the detector threshold
from a high value to a value lower than VDET2.
The conditions to release over-discharge detector are also different by mask options. In terms of so called
“Latch function” version, after detecting over-discharge voltage, connect a charger to the battery pack, and
when the battery supply voltage becomes higher than over-discharge detector threshold, VD2 is released and
the voltage of DOUT pin becomes "H" level. On the other hand, in terms of so called “Released by voltage level”
version, in case that the charger is not connected, when the cell voltage becomes equal released voltage from
over-discharge, over-discharge detector is released. In case that a charger is connected, and when the cell
voltage becomes the released voltage from over-discharge, the over-discharge detector is released.
An excess discharge-current and short circuit state can be sensed and cut off through the built in excess
current detector, VD3, with DOUT being enabled to low level. Once after detecting excess discharge-current or
short circuit, the VD3 is released and DOUT level switches to high by detaching a battery pack from a load
system.
After detecting over-discharge, supply current will be kept extremely low by halting internal circuits' op-
eration.
When the output of COUT is “H”, if V- pin level is set at Vss-2V, the delay time of detector can be shortened.
Especially, the delay time of over-charge detector can be reduced into approximately 1/57. Therefore, testing
time of protector circuit board can be reduced. Output type of COUT and DOUT are CMOS. 6-pin, SOT-23-6 is
available.
-1-






R5478N187CD Datasheet, Funktion
R5475N/R5478Nxxxxx
ELECTRICAL CHARACTERISTICS
*R5478N1xxEC
Unless otherwise specified, Topt=25°C
Symbol
Item
Conditions
Min.
VDD1
Vst
Operating input voltage
Minimum operating Voltage for 0V
charging
VDET1 Over-charge threshold
Voltage defined asVDD-VSS
Voltage defined asVDD-V-,
VDD-VSS=0V
Detect rising edge of supply voltage
R1=330Ω
R1=330Ω (Topt=-5 to 55°C)*Note1
1.5
VDET1-0.025
VDET1-0.030
tVDET1 Output delay of over-charge
VDD=3.6V to 4.4V
tVREL1 Output delay of release from over-charge VDD=4.5V to 3.6V, V-=0V to 0.4V
0.7
11
VDET2 Over-discharge threshold
Detect falling edge of supply voltage VDET2×0.975
tVDET2 Output delay of over-discharge
VDD=3.6V to 2.2V
14
tVREL2 Output delay of release from over-discharge VDD=2.2V to 3.6V
0.7
VDET3
tVDET3
tVREL3
Excess discharge-current threshold
Output delay of excess dis-
charge-current
Output delay of release from excess
discharge-current
Detect rising edge of 'V-' pin voltage VDET3-0.015
VDD=3.0V, V-=0V to 0.4V
4
VDD=3.0V, V-=3V to 0V
0.7
Vshort Short protection voltage
VDD=3.0V
0.50
Tshort
Rshort
Output Delay of Short protection
Reset resistance for Excess dis-
charge-current protection
VDD=3.0V, V-=0V to 3V
VDD=3.6V, V-=1V
150
25
VDS
VOL1
Delay Shortening Mode input voltage
Nch ON voltage of COUT
VDD=4.4V
Iol=50µA, VDD=4.5V
-2.6
VOH1 Pch ON voltage of COUT
Ioh=-50µA, VDD=3.9V
3.4
VOL2 Nch ON voltage of DOUT
Iol=50µA, VDD=2.0V
VOH2 Pch ON voltage of DOUT
Ioh=-50µA, VDD=3.9V
3.4
IDD Supply current
VDD=3.9V, V- =0V
IS Standby current
VDD=2.0V
Typ.
VDET1
VDET1
1.0
16
VDET2
20
1.2
VDET3
6
1.2
0.75
200
50
-2.0
0.4
3.7
0.2
3.7
3.0
Max.
5.0
1.8
Unit Note2
VF
VA
VDET1+0.025
VDET1+0.030
V
V
1.3 s
21 ms
VDET2×1.025 V
26 ms
1.7 ms
VDET3+0.015 V
8 ms
1.7
0.95
300
75
-1.4
0.5
0.5
7.0
0.1
ms
V
µs
kΩ
V
V
V
V
V
µA
µA
B
B
C
D
D
D
E
E
E
E
E
F
G
H
I
J
K
L
L
*Note1: 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 mass production tested.
*Note2: indicates test circuits shown in page 17-20.
-6-

6 Page









R5478N187CD pdf, datenblatt
R5475N/R5478Nxxxxx
TIMING CHART
1. Over-charge (Latch Type) voltage, Excess charge current Operation
Connect
Connect Charger Load Connect Charger
Connect
Load
VDD
VDET1
VDD
V- VDET3
VSS
COUT
VDD
V
tVDET1
tVDET1
tVREL1
tVREL1
Disconnect
Charger and
Connect Load
t
t
t
Charge Current
Charge/
Discharge
Current
0
Discharge Current
t
- 12 -

12 Page





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