Li-Ion Battery Protector
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.
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
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
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.
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
Over-charge/Over-discharge Protection for Li+ One-cell
High Precision Protectors for Cellular Phones or
Instruments Using Li+ One-cell Battery
V- VDD DOUT
VSS VDD CT
COUT CT VSS
DOUT V- COUT
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