LR2125L-AD-AF5-R [UTC]

Adjustable Positive LDO Regulator, 0.8V Min, 5.5V Max, CMOS, PDSO5, LEAD FREE, SOT-25, 5 PIN;


型号：	LR2125L-AD-AF5-R
厂家：	Unisonic Technologies
描述：	Adjustable Positive LDO Regulator, 0.8V Min, 5.5V Max, CMOS, PDSO5, LEAD FREE, SOT-25, 5 PIN 光电二极管输出元件调节器
文件：	总8页 (文件大小：346K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

UNISONIC TECHNOLOGIES CO., LTD

LR2125

LINEAR INTEGRATED CIRCUIT

300mA SELECTABLE

FIXED/ADJUSTABLE LOW

DROPOUT LINEAR REGULATOR



DESCRIPTION

As a low dropout linear regulator, the UTC LR2125 only needs

low input voltage (2.8~6V) and can deliver current to 300mA for

setting the output voltage.

The UTC LR2125 is an ideal for being used in such

battery-powered equipments notebook, personal computer and

cellular phone. Its typical dropout voltage is 230mV at loading current

300mA.

For setting the output voltage, the UTC LR2125 has two output

voltage operation modes: fixed mode senses the output voltage on

V_OUT, ADJ mode needs two resistors as a voltage divider.

To protect itself against current over-loads and over temperature,

the LR2125 has current limit and thermal shutdown functions.



FEATURES

* Operating Voltage: 2.8~6V

* Low Voltage Dropout

* Output Current Guaranteed 300mA

* For Setting Output Voltage Two Modes

– Fixed mode :Fixed Output Voltage 1~5V

– ADJ mode: Adjustable Output Voltage 0.8~5.5V

* Internal Current Limit Protection

* With Soft-Start

* Internal thermal Protection

* Work stably with Low ESR Ceramics Capacitor



ORDERING INFORMATION

Ordering Number

Package

SOT-25

Packing

Lead Free

Halogen Free

LR2125G-xx-AF5-R

LR2125L-xx-AF5-R

Tape Reel

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MARKING INFORMATION

PACKAGE VOLTAGE CODE

MARKING

12 :1.2V

18 :1.8V

25 :2.5V

AD :ADJ

SEXX□

SOT-25

G: Halogen Free

L: Lead Free

Voltage Code



PIN CONFIGURATION



PIN DESCRIPTION

PIN NO

PIN NAME

SHDN

DESCRIPTION

Control pin for shutdown

Logic High: enable

Logic Low: shutdown

Ground

GND

V_IN

Voltage supply

Output pin

V_OUT

When this pin is connected to ground, turns to fixed output voltage operation.

When this pin is connected to an external resistor divider, turns to adjustable output

voltage mode operation.

SET

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LINEAR INTEGRATED CIRCUIT

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BLOCK DIAGRAM

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LR2125

LINEAR INTEGRATED CIRCUIT



ABSOLUTE MAXIMUM RATING (T_A= 25°С, Unless otherwise specified)

PARAMETER

SYMBOL

V_IN

RATINGS

-0.3 ~ +6.5

UNIT

V_INSupply Voltage (V_INto GND)

SHDN Input Voltage ( SHDN to GND)

V_SHDN

-0.3 ~ +6.5

Power Dissipation

P_D

T_J

380

°С

Junction Temperature

Storage Temperature

-40~ +125

-65 ~ +150

T_STG

°С

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.



RECOMMENDED OPERATING CONDITIONS

PARAMETER

SYMBOL

RATINGS

2.8 ~ 6

UNIT

V_INSupply Voltage

Output Voltage

V_IN

V_OUT

I_OUT

C_IN

0.8 ~ 5.5

0 ~ 300

V_OUTOutput Current

Input Capacitor

μF

°С

0.22 ~ 100

1.5 ~ 33

-40 ~ +85

Output Capacitor

Junction Temperature

C_OUT

T_OPR



ELECTRICAL CHARACTERISTICS

(V_IN= V_OUT+1V (min V_IN=2.8V), I_OUT=0~300mA, C_IN= 1μF, C_OUT= 2.2μF, T_A= 25°С, unless otherwise specified)

PARAMETER

Output Voltage

SYMBOL

V_OUT

TEST CONDITIONS

MIN TYP MAX UNIT

0.8

2.8

5.5

Input Voltage

V_IN

∆V

OUT

△V_OUT%/△V_IN, I_OUT=10mA

△V_OUT%/△I_OUT

Line Regulation

-0.07

+0.07 %/V

+0.4 %/A

∆V × V

IN OUT

∆V_OUT

Load Regulation

-0.4

-2

∆I_OUT×V_OUT

Output Voltage Accuracy

Fixed output voltage, I_OUT=10mA

Measured on SET, V_IN=2.8V,

Reference Voltage

Quiescent Current

Dropout Voltage

V_REF

I_Q

0.784 0.8 0.816

_OUT=10mA

I_OUT=10mA ~300mA

_OUT= 2.5V, I_OUT= 300mA

V_OUT= 3.3V, I_OUT= 300mA

135

230

170

160

360

300

μA

V_D

Power Supply Ripple Rejection Ratio

Output Voltage Noise

PSRR f = 10kHz, I_OUT= 300mA

I_LIMIT

V_IH

f = 80Hz ~ 100KHz, I_OUT= 300mA

160

500

μV_RMS

Current Limit

400

1.6

650

Shutdown Threshold

V_IL

0.4

Shutdown Supply Current

I_OFF

0.1

μA

SHDN = Low, V_IN= 6V

SHDN = Low

V_OUTDischarge MOSFET R_DS(ON)

Ω

Thermal Shutdown Temperature

Thermal Shutdown Hysteresis

SET Input Threshold for

Fixed/Adjustable Output Voltage Mode

SET Input Bias Current

T_SHDN

160

°С

DT_SHDN

100

-100

100

Soft-Start Interval

T_SS

μs

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LINEAR INTEGRATED CIRCUIT

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APPLICATION INFORMATION

Input Capacitor

Value：

Larger than 1µF, at least a 1µF ceramic capacitor

Place：

Be placed near the V_INvery closely

Purpose and Advantage Description：

To prevent the input rail from dropping, this capacitor can provide surge current as while as the circuit’s stepping

load transients.

Output Capacitor

Value：

Larger than 2.2µF

Place：

Be placed at the load and near the GND pin very closely.

Purpose and Advantage Description：

Mainly make sure the circuit’s operating stability. And the large value capacitor also can reduce noise and improve

transient response. Additionally, it can affect power on issue.

0.1155

= 87(0.55 -

)

OUT(max)

OUT

Maximum Output Capacitor’s Value (µF) and the Output Voltage (V)’s Value’s Relationship

Maximum Output Capacitor’s Changing Over V_OUT

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TYPICAL APPLICATION CIRCUITS

For Fixed Output Voltage Mode

For Adjustable Output Voltage Mode

V_OUT= 0.8×(1+

)

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TYPICAL CHARACTERISTICS

Quiescent Current vs. Output Current

Output Voltage vs. Input Voltage

3.0

2.5

2.0

1.5

1.0

0.5

180

160

140

120

100

I_OUT=0mA

I_OUT=300mA

V_IN=5.5V

V_IN=4.5V

100 150 200 250 300

Input Voltage,V_IN(V)

Output Current, I_OUT(mA)

Dropout Voltage vs. Output Current

Quiescent Current vs. Input Voltage

300

250

200

150

100

250

200

150

100

I_OUT=300mA

I_OUT=0mA

100 150 200 250 300

Output Current,I_OUT(mA)

Input Voltage,V_IN(V)

Line Transient

Load Transient

C_IN=1µF,C_OUT=2.2µF,

V_IN=3.0V,C_IN=1µF,C_OUT=2.2µF

V_OUT

V_IN

I_OUT

V_OUT

CH1:V_{I N},1V/div,DC

CH2:V_{O U T},20mV/div,AC

Time:100µs/div

CH2:V_{O U T},50mV/div,AC

CH3:I_{O U T},200mA/div,DC

Time:100µs/div

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LR2125

LINEAR INTEGRATED CIRCUIT

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TYPICAL CHARACTERISTICS(Cont.)

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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