Preliminary
RT9541
Li-Ion Battery Protector
General Description
The RT9541 Series are protection ICs for over-
charge/discharge of rechargeable one-cell Lithium-ion
(Li+) batteries by CMOS process.
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.
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.
Features
Low supply current
鈭?/div>
Supply current: TYP. 2.0碌A(chǔ)
碌
鈭?/div>
Standby
current
(after
detecting
over-
discharge): Less than 0.2碌A(chǔ)
碌
High accuracy detector threshold
鈭?/div>
Over-charge detector:
鹵
25mV
鈭?/div>
Over-discharge detector:
鹵
2.5%
Built-in protection circuit
鈭?/div>
Excess current trip/Short circuit protector in
both charging and discharging direction
Output delay of over-charge adjustable with
an external capacitor: 75mS at 0.01碌F
碌
Ultra small package: SOT26
Ordering Information
RT9541
Package type
E : SOT-26 Type I
ER : SOT-26 Type II
Operating temperature range
C: Commercial standard
See Table 1
Applications
Over-charge / Over-discharge Protection for Li+
One-cell Pack
High Precision Protectors for Cellular Phones or
Instruments Using Li+ One-cell Battery
Pin Configurations
Part Number
RT9541 CE
Pin Configurations
TOP VIEW
6
5
4
Typical Application Circuit
R1
100鈩?/div>
C1
0.1碌F
CT
C3
0.01碌F
+
(Plastic SOT-26)
1
2
3
VDD
1.
2.
3.
4.
5.
6.
COUT
CT
VSS
DOUT
VDD
V-
RT9541
V-
COUT
RT9541 CER
(Plastic SOT-26)
6
5
4
TOP VIEW
1.
2.
3.
4.
5.
6.
DOUT
V-
COUT
CT
VDD
VSS
VSS
DOUT
1
2
3
C2
0.1碌F
R2
1K鈩?/div>
DS9541-05 August 2001
www.richtek-ic.com.tw
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