RICHTEK RT9541BCER, RT9541CCE, RT9541CCER, RT9541DCE, RT9541DCER Datasheet

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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.

Ordering Information

RT9541   

Package type

E : SOT-26 Type I

ER : SOT-26 T

pe II

Operating temperature range

C: Commercial standard

See Table 1

Typical Application Circuit

R2 1K

Ω

R1 100

Ω

0.1µF

0.01µF

VSS DOUT

0.1µF

RT9541

VDD

V-

COUT

Features

Low supply current

−

Supply current: TYP. 2.0µµµµA

−

Standby current (after detecting over-

discharge): Less than 0.2µµµµA

High accuracy detector threshold

−

Over-charge detector: ±±±±25mV

−

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 0.01µµµµF

Ultra small package: SOT26

Applications

Over-charge / Over-discharge Protection for Li+

One-cell Pack

z High Precision Protectors for Cellular Phones or

Instruments Using Li+ One-cell Battery

Pin Configurations

Part Number Pin Configurations

RT9541CE

(Plastic SOT-26)

RT9541CER

(Plastic SOT-26)

321

TOP VIEW

1. COUT

2. CT

3. VSS

4. DOUT

5. VDD

6. V-

TOP VIEW

1. DOUT

2. V-

3. COUT

4. CT

5. VDD

6. VSS

DS9541-05 August 2001 www.richtek-ic.com.tw

RT9541

Preliminary

Absolute Maximum Ratings

z Allowable Battery Voltage -0.3V ~ 7V

z Input Voltage (V) VDD-14V to VDD +0.3V

z Input Voltage (CT) VSS-0.3V to VDD +0.3V

z Output Voltage (COUT) VDD-14V to VDD +0.3V

z Output Voltage (DOUT) VSS-0.3V to VDD +0.3V

z Power Dissipation, P

@ TA = 25°C

SOT-26 0.25W

z Package Thermal Resistance

SOT-26, θ

z Operating Temperature Range -20°C ~ +85°C

z Storage Temperature Range -65°C ~ +150°C

250°C/W

Electrical Characteristics

Parameter Symbol Test Conditions Min Typ Max Units

Operating Input Voltage

Charger Voltage

Minimum Operating Voltage for 0V Charging

Accuracy of Over-charge Threshold Voltage

∆V

CHG

OCHG

Voltage defined as VDD-VSS 1 -- 6 V

Voltage defined as VDD-V- -- -- 14 V

Voltage defined as VDD-VVDD-VSS = 0V

Detect rising edge of supply voltage

-- -- 1 V

-25 -- 25 mV

Over-charge Threshold Hysteresis 0.1 0.15 0.2 V

Output Delay Time of Over-charge

Accuracy of Over-discharge Threshold Voltage

Output Delay Time of Overdischarge

Excess Current Threshold Voltage During Discharge

Output Delay of Discharge Excess Current

Excess Current Threshold Voltage During Charge

OCHG

∆V

ODISCHG

C3 = 0.01µF, VDD = 3.6V ~

4.3V

Detect falling edge of supply voltage

30 60 80 mS

-2.5 -- 2.5

VDD = 3.6V ~ 2.4V 10 15 20

Detect rising edge of “V-“ pin voltage

0.15 0.17 0.19

VDD = 3.0V 15 20 25

Detect falling edge of “V-“ pin voltage

-0.19 -0.17 -0.15

Output Delay of Charge Excess Current

Short Detection Voltage During Discharge

Output Delay of Discharge Short Circuit

Reset Resistance for Excess Current Protection

Supply Current

Standby Current

www.richtek-ic.com.tw DS9541-05 August 2001

SHORT

STANDBY

VDD = 3.0V VDD-1.1 VDD-0.8 VDD-0.5

VDD = 3.0V -- 5 50

VDD = 3.6V, V- = 1.0V 25 50 75

VDD = 3.9V, V- = 0V -- 2.0 5.0

VDD = 2.0V -- 0.1 0.5

15 20 25

µS

kΩ

µA

Table 1

Preliminary

RT9541

Part Number

RT9541ACE (R) 4.25V 2.3V 170mV

RT9541BCE (R) 4.25V 2.4V 170mV

RT9541CCE (R) 4.25V 2.5V 170mV

RT9541DCE (R) 4.25V 2.6V 170mV

RT9541ECE (R) 4.25V 2.7V 170mV

RT9541FCE (R) 4.25V 2.8V 170mV

RT9541GCE (R) 4.30V 2.3V 170mV

RT9541HCE (R) 4.30V 2.4V 170mV

RT9541ICE (R) 4.30V 2.5V 170mV

RT9541JCE (R) 4.30V 2.6V 170mV

Over

Charge

Over

Discharge

Excess

Current

Function Block Diagram

VDD CT

Part Number

RT9541KCE (R) 4.30V 2.7V 170mV

RT9541LCE (R) 4.30V 2.8V 170mV

RT9541MCE (R) 4.35V 2.3V 170mV

RT9541NCE (R) 4.35V 2.4V 170mV

RT9541OCE (R) 4.35V 2.5V 170mV

RT9541PCE (R) 4.35V 2.6V 170mV

RT9541QCE (R) 4.35V 2.7V 170mV

RT9541RCE (R) 4.35V 2.8V 170mV

RT9541SCE (R) 4.35V 2.9V 170mV

RT9541TCE (R) 4.25V 2.9V 170mV

Over

Charge

Over

Discharge

Excess

Current

Pin Description

Pin Number

RT9541-CE RT9541-CER

1 3 COUT Output of Over-charge Detection, CMOS Output

2 4 CT Pin for External Capacitor Setting Output Delay of VD1

3 6 VSS Ground

4 1 DOUT Output of Over-discharge Detection, CMOS Output

VD1

VD2

VSS

Pin Name Pin Function

VD4

VD3

Delay

Level Shift

Short

Cir cuit

Detector

DOUT COU T V-

5 5 VDD Power Supply, through a Resistor (R1)

6 2 V- Pin for Charger Negative Input, through a Resistor (R2)

DS9541-05 August 2001 www.richtek-ic.com.tw

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