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  Richtek Technology Electronic Components Datasheet  

RT9545 Datasheet

Li-Ion Battery Protector

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RT9545 pdf
Preliminary
RT9545
Li-Ion Battery Protector
General Description
Features
The RT9545 Series are protection ICs for over-charge/
discharge of rechargeable one-cell Lithium-ion (Li+)
batteries by CMOS process.
The RT9545 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-23-6 is available.
Ordering Information
RT9545
Low Supply Current
Supply Current: Typical 2.0µA
Standby Current (after Detecting Over-discharge)
: Less than 0.2µA
High Accuracy Detector Threshold
Over-Charge Detector : 90mV to +40mV
Over-Discharge Detector : ± 2.5%
Built-in Protection Circuit :
Excess Current Trip/Short Circuit Protector in both
Charging and Discharging Direction
Output Delay of Over-charge Adjustable with an
External Capacitor: 75ms at 0.01µF
Ultra Small Package: SOT-23-6
RoHS Compliant and 100% Lead (Pb)-Free
Package Type
E : SOT-23-6
ER : SOT-23-6 (R-Type)
Operating Temperature Range
C : Commercial Standard
P : Pb Free with Commercial Standard
Over-charge / Over-discharge
O : 4.35V / 2.5V
T : 4.25V / 2.9V
S : 4.35V / 2.9V
Note :
RichTek Pb-free products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
100%matte tin (Sn) plating.
Marking Information
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
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
(TOP VIEW)
V- VDD DOUT
VSS VDD CT
654
654
123
123
COUT CT VSS
SOT-23-6
DOUT V- COUT
SOT-23-6 (R-Type)
Note : There is no pin1 indicator on top mark for SOT-23-6
type, and pin1 will be lower left pin when reading top mark
from left to right.
DS9545-06 March 2005
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9545 Datasheet

Li-Ion Battery Protector

No Preview Available !

RT9545 pdf
RT9545
Preliminary
Typical Application Circuit
R1
1K
C1
0.1uF
CT
C3
0.01uF VSS
VDD
RT9545
V-
DOUT COUT
+
C2
0.1uF
Q1 Q2
R2
100 _
Functional Pin Description
RT9545-
1
2
3
4
5
6
Pin No.
E RT9545-
3
4
6
1
5
2
Pin Name
ER
Pin Function
COUT
Output of Over-charge Detection, CMOS output
CT Pin for external capacitor setting output delay of VD1
VSS
Ground
DOUT
Output of Over-discharge Detection, CMOS output
VDD
Power Supply, through a resistor (R1)
VPin for Charge Negative Input, through a resistor (R2)
Function Block Diagram
VDD
CT
-
+
VD1
-
+
VD2
+
-
VD4
+
-
VD3
Dalay
Level Shift
Short
Circuit
Detector
VSS
www.richtek.com
2
DOUT
COUT V-
DS9545-06 March 2005


Part Number RT9545
Description Li-Ion Battery Protector
Maker Richtek Technology
Total Page 7 Pages
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