LB1138BL-50-S08-R [UTC]

HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR;


型号：	LB1138BL-50-S08-R
厂家：	Unisonic Technologies
描述：	HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR 输出元件
文件：	总7页 (文件大小：271K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

UNISONIC TECHNOLOGIES CO., LTD

L1138B

CMOS IC

HIGH OUTPUT CURRENT CMOS

VOLTAGE REGULATOR WITH

HIGH RIPPLE-REJECTION AND

LOW DROPOUT

SOP-8



DESCRIPTION

SOT-89-5

The UTC L1138B is a positive LDO voltage regulator using CMOS

technology. It is featured as: low dropout voltage, high output voltage

accuracy, and low current consumption.

The internal circuits include a low on-resistance transistor to provide

a low dropout voltage and large output current; an overcurrent protector

to make sure the load current don’t exceed the current capacitance of

the output transistor, a thermal shutdown circuit to escape device

damage from over-heat, and an ON/OFF circuit to keep the battery life

longer.

SOT-25

In applications, the UTC L1138B can be used in power supply unit

for DVD, CD-ROM drives, battery-powered devices, personal

communication devices, and NBs.



FEATURES

* Output voltage‘s high accuracy: ±1.0%

* Low dropout voltage:

120mV typ.

@3.3V output , I_OUT=300mA

80μA(Typ.)160μA max in operation

0.1μA(Typ.)1.0μA max in shutdown mode

800mA output

* Low current consumption:

* High current capability:

@V_IN≥V_OUT(S)+1.0V

* With ON/OFF circuit:

* High ripple rejection

Ensures long battery life.

70dB typ@1.0kHz

* With over current protector

* With thermal shutdown circuit

 ORDERING INFORMATION

Ordering Number

Package

Packing

Lead Free

Halogen Free

L1138BG-xx-AB5-R

L1138BG-xx-AF5-R

L1138BG-xx-S08-R

L1138BG-xx-AB5-R

L1138BG-xx-AF5-R

L1138BG-xx-S08-R

SOT-89-5

SOT-25

SOP-8

Tape Reel

xx: Output Voltage, refer to Marking Information.

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L1138B

CMOS IC



MARKING INFORMATION

PACKAGE

VOLTAGE CODE

MARKING

SOT-89-5

12: 1.2V

25: 2.5V

28: 2.8V

33: 3.3V

35: 3.5V

36: 3.6V

45: 4.5V

50: 5.0V

SOT-25

SOP-8



PIN CONFIGURATION



PIN DESCRIPTION

FOR /SOT-89-5 Package

PIN NO.

PIN NAME

DESCRIPTION

SOT-25

SOT-89-5

V_IN

Input voltage Pin

Ground Pin

GND

ON/OFF

Shutdown Pin

No Connection, NC pin is electrically open and can be connected

_INand GND

Output voltage Pin

V_OUT

FOR SOP-8 Package

PIN NO.

1,2,3

PIN NAME

DESCRIPTION

V_OUT

GND

Output voltage Pin (Note 1)

Ground Pin

ON/OFF Shutdown Pin

V_INInput voltage Pin (Note 2)

6,7,8

Notes: 1. Short pins 1, 2, 3

2. Short pins 6, 7, 8

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L1138B

CMOS IC



BLOCK DIAGRAM

V_IN

Overcurrent Protector

Thermal Shutdown

Reference

Voltage Circuit

Parasitic

diode

ON/OFF

Circuit

V_OUT

ON/OFF

GND

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L1138B

CMOS IC



ABSOLUTE MAXIMUM RATING (T_A= 25°C, unless otherwise specified)

PARAMETER

SYMBOL

V_IN

RATINGS

UNIT

Input Voltage

V_ON/OFF

V_OUT

V_IN+0.3

Output Voltage

V_IN+0.3

Power Dissipation

P_D

Internally limited

-40~+85

-40~+125

°C

Operating Temperature

Storage Temperature

T_OPR

T_STG

Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute

maximum ratings are stress ratings only and functional device operation is not implied.



ELECTRICAL CHARACTERISTICS (T_A= 25°C, V_IN=V_OUT+1V, unless otherwise specified)

Parameter

SYMBOL

V_IN

TEST CONDITIONS

MIN TYP MAX UNIT

Input Voltage

6.5

Output Voltage (Note 1)

V_OUT(E)

∆V_OUT1

V_IN=V_OUT(S)+1.0V, I_OUT=100mA

-1%

800

+1%

_OUT(S)+ 0.5V ≤V_IN≤6.5V,

_OUT= 100mA

_IN= V_OUT(S)+ 1.0 V,

1.0mA ≤I_OUT≤300mA

V_IN≤V_OUT(S)+1.0 V

Line Regulation

0.05

0.3

%/V

∆V × V_OUT

Load Regulation

∆V_OUT2

I_OUT

100

µA

Output Current (Note 2)

_IN= V_OUT(S)+1.0 V,

ON/OFF pin = ON, no load

_IN= V_OUT(S)+ 1.0 V,

ON/OFF pin = OFF, no load

_IN= V_OUT(S)+ 1.0 V,

ON/OFF pin = ON, V_OUT= 0 V

V_OUT(S)=1.2V

Current

Operation

Shutdown

I_SS1

160

1.0

Consumption

During

I_SS2

0.1

µA

Short-Circuit Current

I_SHORT

350

0.8

1.0

V_OUT(S)=2.5V

0.15 0.22

0.12 0.18

Dropout Voltage (Note 3)

V_D

I_OUT= 300mA

V_OUT(S)=2.8V

3.3V ≤ V_OUT(S)≤ 5.5V

Temperature Coefficient of

Output Voltage

_IN= V_OUT(S)+1.0V,

T_CV_O

±150

ppm/°C

_OUT= 10mA, -40°C≤ T_A≤85°C

V_IN= V_OUT(S)+1.0 V

f = 1.0kHz,

1.2V ≤V_OUT(S)≤ 3.0V

3.1V ≤V_OUT(S)≤ 5.5V

Power Supply Rejection

PSRR

_OUT= 100 mA

∆V_rip= 0.5V_rms

Shutdown Pin

Input Voltage

High

V_SH

V_SL

I_SH

V_IN= V_OUT(S)+1.0V

V_IN= V_OUT(S)+ 1.0V

1.5

Low

0.3

0.1

Shutdown Pin

Input Current

High

V_IN= 6.5V, V_ON/OFF= 6.5V

V_IN= 6.5V, V_ON/OFF= 0V

Junction temperature

-0.1

µA

°C

Low

I_SL

0.1

Thermal

Detection

T_SD

150

Shutdown

Temperature

Release

T_SR

Junction temperature

120

°C

Notes: 1. V_OUT(S): Specified output voltage.

_OUT(E): Actual output voltage at the fixed load

2. When fixing( I_OUT= 100mA) and inputting V_OUT(S)+ 1.0 V

3. This output current means the one at which the output voltage becomes 98% of V_OUT(E)after gradually

increasing the output current.

4. The dropant voltage is detmed as V_IN- V_OUT, which is measured when V_OUTis V_OUT(normal)× 98%

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L1138B

CMOS IC



OPERATION

1. Basic operation

The reference voltage (V_REF) and V_FB(the output voltage resistance-divided by feedback resistors R_Sand R_F)

are the input for the error amplifier.

2. Output transistor

A low on-resistance P-channel MOSFET is used as the output transistor. Inverse current flowing from V_OUTpin

through a parasitic diode to V_INpin can damage the regulator, so be sure that V_OUTdoes not exceed V_IN+ 0.3V.

3. Shutdown pin (ON/OFF pin)

The shutdown pin can start and stop the regulator.The shutdown mode set by this pin can stop the operation

of all internal circuits. The structure of the ON/OFF pin is shown in Fig. When the ON/OFF pin is not used,

connect it to the V_INpin.

ON/OFF Pin

“L”: Power off

“H”: Power on

Internal Circuits

Stopped

V_OUTPin Voltage

GND level

Current Consumption

I_SS2

I_SS1

Operating

Set value

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L1138B

CMOS IC



TEST CIRCUITS

1. Output Voltage Test

2. Current Consumption Test

3. Output Current Test

4. Shutdown Pin Input Voltage / Current Test

5. Power Supply Rejection Test

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L1138B

CMOS IC



TYPICAL APPLICATION CIRCUIT

UTC assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or

other parameters) listed in products specifications of any and all UTC products described or contained

herein. UTC products are not designed for use in life support appliances, devices or systems where

malfunction of these products can be reasonably expected to result in personal injury. Reproduction in

whole or in part is prohibited without the prior written consent of the copyright owner. The information

presented in this document does not form part of any quotation or contract, is believed to be accurate

and reliable and may be changed without notice.

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