RT9541HCE_技术文档

Preliminary

RT9541

Li-Ion Battery Protector

Features

General Description

^zLow 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.

^zHigh accuracy detector threshold

− Over-charge detector: 25mV

− Over-discharge detector: 2.5%

^zBuilt-in protection circuit

− Excess current trip/Short circuit protector in

both charging and discharging direction

^zOutput delay of over-charge adjustable with

an external capacitor: 75mS at 0.01µF

^zUltra 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 ꢀ ꢀ ꢀ

^zOver-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

www.richtek-ic.com.tw

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

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

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

µA

DD

STANDBY

www.richtek-ic.com.tw

DS9541-05 August 2001

2

Preliminary

RT9541

Table 1

Over

Excess

Over

Excess

Part Number

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

4.30V

2.3V

2.4V

2.5V

2.6V

2.7V

2.8V

2.3V

2.4V

2.5V

2.6V

170mV

RT9541KCE (R)

RT9541LCE (R)

RT9541MCE (R)

RT9541NCE (R)

RT9541OCE (R)

RT9541PCE (R)

RT9541QCE (R)

RT9541RCE (R)

RT9541SCE (R)

RT9541TCE (R)

4.30V

4.35V

4.25V

2.7V

2.8V

2.3V

2.4V

2.5V

2.6V

2.7V

2.8V

2.9V

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

www.richtek-ic.com.tw

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.

www.richtek-ic.com.tw

DS9541-05 August 2001

4

Preliminary

RT9541

Timing Diagram

RT9541-ꢀCE/CER

DS9541-05 August 2001

www.richtek-ic.com.tw

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

www.richtek-ic.com.tw

DS9541-05 August 2001

6

Preliminary

RT9541

DS9541-05 August 2001

www.richtek-ic.com.tw

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

www.richtek-ic.com.tw

DS9541-05 August 2001

8


型号：	RT9541HCE
厂家：	ETC
描述：	LI LON BATTERY PROTECTOR 李LON电池保护电池
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

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