RT9541KCER [ETC]
LI LON BATTERY PROTECTOR; 李LON电池保护型号: | RT9541KCER |
厂家: | ETC |
描述: | LI LON BATTERY PROTECTOR |
文件: | 总8页 (文件大小:196K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
Preliminary
RT9541
Li-Ion Battery Protector
Features
General Description
z Low supply current
The RT9541 Series are protection ICs for over-
charge/discharge of rechargeable one-cell Lithium-ion
(Li+) batteries by CMOS process.
− Supply current: TYP. 2.0µA
− Standby current (after detecting over-
discharge): Less than 0.2µA
The RT9541 Series can detect over-charge/discharge
of Li+ one-cell and excess load current and charge
current, further include a short circuit protector for
preventing large external short circuit current.
z High accuracy detector threshold
− Over-charge detector: 25mV
− Over-discharge detector: 2.5%
z Built-in protection circuit
− Excess current trip/Short circuit protector in
both charging and discharging direction
z Output delay of over-charge adjustable with
an external capacitor: 75mS at 0.01µF
z Ultra small package: SOT26
Each of these ICs is composed of four voltage
detectors, a reference unit, a hysteresis circuit, and a
bidirectional short circuit protector. Package of SOT-
26 is available.
Ordering Information
Applications
RT9541ꢀ ꢀ ꢀ ꢀ
z Over-charge / Over-discharge Protection for Li+
One-cell Pack
Package type
E : SOT-26 Type I
ER : SOT-26 Type II
z High Precision Protectors for Cellular Phones or
Instruments Using Li+ One-cell Battery
Operating temperature range
C: Commercial standard
See Table 1
Pin Configurations
Part Number
Pin Configurations
TOP VIEW
Typical Application Circuit
RT9541ꢀCE
1. COUT
2. CT
6
5
4
(Plastic SOT-26)
+
R1
3. VSS
4. DOUT
5. VDD
6. V-
100Ω
1
2
3
C1
VDD
0.1µF
TOP VIEW
RT9541
RT9541ꢀCER
CT
V-
C3
(Plastic SOT-26)
1. DOUT
2. V-
6
1
5
2
4
3
0.01µF
COUT
VSS
DOUT
3. COUT
4. CT
5. VDD
6. VSS
R2
C2
1KΩ
0.1µF
DS9541-05 August 2001
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1
RT9541
Preliminary
Absolute Maximum Ratings
z Allowable Battery Voltage
z Input Voltage (V)
-0.3V ~ 7V
VDD-14V to VDD +0.3V
VSS-0.3V to VDD +0.3V
VDD-14V to VDD +0.3V
VSS-0.3V to VDD +0.3V
z Input Voltage (CT)
z Output Voltage (COUT)
z Output Voltage (DOUT)
z Power Dissipation, P @ T = 25°C
D
A
SOT-26
z Package Thermal Resistance
SOT-26, θ
0.25W
250°C/W
JA
z Operating Temperature Range
z Storage Temperature Range
-20°C ~ +85°C
-65°C ~ +150°C
Electrical Characteristics
Parameter
Symbol
Test Conditions
Min
1
Typ
--
Max Units
Operating Input Voltage
Charger Voltage
Voltage defined as VDD-VSS
Voltage defined as VDD-V-
6
V
V
V
DD
--
--
14
V
CHG
Minimum Operating Voltage for 0V
Charging
Voltage defined as VDD-V-
VDD-VSS = 0V
--
--
1
V
Accuracy of Over-charge
Threshold Voltage
Detect rising edge of supply
voltage
-25
0.1
30
--
25
0.2
80
mV
V
∆V
OCHG
Over-charge Threshold Hysteresis
0.15
60
C3 = 0.01µF, VDD = 3.6V ~
4.3V
Output Delay Time of Over-charge
mS
T
OCHG
Accuracy of Over-discharge
Threshold Voltage
Detect falling edge of supply
voltage
-2.5
10
--
15
2.5
20
%
mS
V
∆V
ODISCHG
ODISCHG
Output Delay Time of Over-
discharge
VDD = 3.6V ~ 2.4V
T
Excess Current Threshold Voltage
During Discharge
Detect rising edge of “V-“ pin
voltage
0.15
15
0.17
20
0.19
25
Output Delay of Discharge Excess
Current
VDD = 3.0V
mS
V
Excess Current Threshold Voltage
During Charge
Detect falling edge of “V-“ pin
voltage
-0.19
15
-0.17
20
-0.15
25
Output Delay of Charge Excess
Current
mS
V
Short Detection Voltage During
Discharge
VDD = 3.0V
VDD-1.1 VDD-0.8 VDD-0.5
Output Delay of Discharge Short
Circuit
VDD = 3.0V
--
5
50
75
T
µS
kΩ
SHORT
Reset Resistance for Excess
Current Protection
VDD = 3.6V, V- = 1.0V
25
50
R
SHORT
Supply Current
Standby Current
VDD = 3.9V, V- = 0V
VDD = 2.0V
--
--
2.0
0.1
5.0
0.5
I
I
µA
µA
DD
STANDBY
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DS9541-05 August 2001
2
Preliminary
RT9541
Table 1
Over
Over
Excess
Over
Over
Excess
Part Number
Part Number
Charge Discharge Current
Charge Discharge Current
RT9541ACE (R)
RT9541BCE (R)
RT9541CCE (R)
RT9541DCE (R)
RT9541ECE (R)
RT9541FCE (R)
RT9541GCE (R)
RT9541HCE (R)
RT9541ICE (R)
RT9541JCE (R)
4.25V
4.25V
4.25V
4.25V
4.25V
4.25V
4.30V
4.30V
4.30V
4.30V
2.3V
2.4V
2.5V
2.6V
2.7V
2.8V
2.3V
2.4V
2.5V
2.6V
170mV
170mV
170mV
170mV
170mV
170mV
170mV
170mV
170mV
170mV
RT9541KCE (R)
RT9541LCE (R)
RT9541MCE (R)
RT9541NCE (R)
RT9541OCE (R)
RT9541PCE (R)
RT9541QCE (R)
RT9541RCE (R)
RT9541SCE (R)
RT9541TCE (R)
4.30V
4.30V
4.35V
4.35V
4.35V
4.35V
4.35V
4.35V
4.35V
4.25V
2.7V
2.8V
2.3V
2.4V
2.5V
2.6V
2.7V
2.8V
2.9V
2.9V
170mV
170mV
170mV
170mV
170mV
170mV
170mV
170mV
170mV
170mV
Function Block Diagram
VDD
CT
_
Level Shift
VD1
_
VD4
Short
Circuit
_
Delay
Detector
VD2
_
VD3
VSS
DOUT COUT
V-
Pin Description
Pin Number
RT9541-ꢀCE RT9541-ꢀCER
Pin Name
Pin Function
1
2
3
4
5
6
3
4
6
1
5
2
COUT
CT
Output of Over-charge Detection, CMOS Output
Pin for External Capacitor Setting Output Delay of VD1
Ground
VSS
DOUT
VDD
V-
Output of Over-discharge Detection, CMOS Output
Power Supply, through a Resistor (R1)
Pin for Charger Negative Input, through a Resistor (R2)
DS9541-05 August 2001
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3
RT9541
Preliminary
Applications Information
(1) Operation Description
Refering to the “Function Block Diagram”, when
charging voltage crosses the detector threshold from
a low value to a value higher than VDET1, the output
of COUT pin, the output of over-charge detector/VD1,
swiches to low level,..charger’s negative pin level.
After detecting over-charge the VD1 can be reset and
the output of COUT pin becomes “H” when the VDD
voltage is coming down to a level lower than “VDET1
– VHYS1”, or when a charger is disconnected from
the battery pack.
The short circuit protection function in charging
direction was also provided. When COUT high and
the “V-“ pin voltage 5V lower than VSS pin, the
RT9541 will turn low COUT with a fixed delay. The
COUT will go high after the short circuit condition
was removed.
After detecting over-discharge, supply current will be
kept extremely low by halting some internal circuits
operation. The output delay of over-charge detectors
can be set by connecting an external capacitor.
Output type of COUT and DOUT are CMOS.
The output of DOUT pin, the output of over-discharge
detector/VD2, switches to “L” after internally fixed
delay time passed, when discharging voltage crosses
the detector threshold from a high value to a value
lower than VDET2. An excess load current can be
sensed and cut off after internally fixed delay time
passsed through the built in excess current detector,
VD3, with DOUT being enabled to low level. Once
after detecting excess current, the VD3 is released
and DOUT level switches to “H” by detaching a
battery pack from a load system.
(2) Component Selection Guide:
Referring to “Typical Application Circuit”, R1 and
C1 will stabilize a supply voltage to the RT9541. 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 RT9541.
R2 and C2 will stabilize a V- pin voltage. The
resetting from over-discharge with connecting
charger possibly be disabled by larger value of R2.
Recommended value is less than 1kΩ. And
recommended C2 value is less than 1µF.
Futher, short circuit protector makes DOUT level to
“L” immediately with external short circuit current and
removing external short circuit leads DOUT level to
“H”.
R1 and R2 can operate as a current limiter against
setting cell reverse direction or for applying excess
charging voltage to the RT9541. While smaller R1
and R2 may cause an over power dissipation rating
of the RT9541 and a total of “R1+R2” should be
more than 1kΩ.
The excess charging current is also monitored, and
the charging path will be cut off (by turn low COUT)
after excess charging current was detected lasting a
internally fixed delay time. The charging path will be
re-started (by turn high COUT) after another
internally fixed delay. If the excess charging current is
still there, the same process will be repeated and
cause the charging path toggling on and off with a
12.5% on duty. Such a protection function reduces
the average charging current to 12.5% of original
value when excess charging current detected.
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DS9541-05 August 2001
4
Preliminary
RT9541
Timing Diagram
RT9541-ꢀCE/CER
DS9541-05 August 2001
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5
RT9541
Package Information
Preliminary
D
C
B
b
H
A
A1
L
e
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
0.889
--
Max
Min
0.035
--
Max
A
A1
B
1.295
0.152
1.803
0.559
2.997
3.099
1.041
0.254
0.610
0.051
0.006
0.071
0.022
0.118
0.122
0.041
0.010
0.024
1.397
0.356
2.591
2.692
0.838
0.102
0.356
0.055
0.014
0.102
0.106
0.033
0.004
0.014
b
C
D
e
H
L
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DS9541-05 August 2001
6
Preliminary
RT9541
DS9541-05 August 2001
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7
RT9541
Preliminary
RICHTEK TECHNOLOGY CORP.
Headquarter
RICHTEK TECHNOLOGY CORP.
Taipei Office (Marketing)
6F, No. 35, Hsintai Road, Chupei City
8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City
Hsinchu, Taiwan, R.O.C.
Taipei County, Taiwan, R.O.C.
Tel: (8863)5510047 Fax: (8863)5537749
Tel: (8862)89191466 Fax: (8862)89191465
Email: marketing@richtek-ic.com.tw
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DS9541-05 August 2001
8
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