LR18120HG-18-SH2-R - Unisonic Technologies Co., Ltd.

UNISONIC TECHNOLOGIES CO., LTD

LR18120 CMOS IC

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2A LOW DROPOUT REGULATOR

WITH ENABLE

 DESCRIPTION

The UTC LR18120 is a positive voltage regulator with high

performance. It has low dropout voltage and low input voltage,

besides its output voltage can be fixed at 1.2V, 1.5V, 1.8V, or 2.5V

depending on internal feedback resistors or ADJ (not connected to the

ground) with external feedback resistors. The input voltage of UTC

LR18120 can be low to 1.4V. There are two additional pin in the

LR18120. One is EN pin and the other is POK pin.

The UTC LR18120 is specially made for applications with low

input voltage, low dropout voltage, and low output voltage which is

almost the same as the input voltage. Typical applications include

motherboards, notebooks, set top boxes, network cards and

peripheral cards.

 FEATURES

* VIN as Low as 1.4V and VPP Voltage 5V

* VD=320mV @ IOUT=2A, VOUT=1.2V

* Internal Over Current and Over Temperature Protection

* With Enable Pin

* Output Voltage: ±2%

* 1.2V, 1.5V, 1.8V and 2.5V Output Voltage

Adjustable Externally Using Resistors

* When Disable VOUT Pull Low Resistance

 ORDERING INFORMATION

Ordering Number Package Packing

Lead Free Halogen Free

LR18120xL-xx-S08-R LR18120xG-xx-S08-R SOP-8 Tape Reel

LR18120xL-xx-SH2-R LR18120xG-xx-SH2-R HSOP-8 Tape Reel

LR18120 CMOS IC

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 MARKING INFORMATION

PACKAGE VOLTAGE CODE MARKING

SOP-8

HSOP-8

12:1.2V

15:1.5V

18:1.8V

25:2.5V

 PIN CONFIGURATION

 PIN DESCRIPT ION

PIN NO. PIN NAME DESCRIPTION

1 POK

This pin will Indicate high under this situation: VO reaches 92% of its rating voltage.

Open-drain output.

2 VEN

The enable control Input pin. As while as this pin’s voltage falls below 0.4V ,the

LR18120 will stop working. When there’s nothing connected with this pin, for active

High version, the device will be enabled；, for active Low version，the device will be

shutdowned

3 VIN

The pin of input voltage.

Placing large capacitance closely to this pin is necessary. There should be

connected a 10µF ceramic capacitor.

4 VPP This pin is for input voltage to control circuit.

5 NC Connected nothing.

6 VOUT The voltage output pin.

7 ADJ

When this pin connected to the ground,VOUT will be set by the internal feedback

resistors. Otherwise, if using external feedback resistors to decide the VOUT, VOUT =

0.8(R1+R2)/R2 Volts.

8 GND Ground.

LR18120 CMOS IC

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 BLOCK DIAGRAM

Enable Threshold Level High:

+

-

+

-

Enable Threshold Level Low:

+

-

+

-

LR18120 CMOS IC

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 ABSOLUTE MAXIMUM RATING

PARAMETER SYMBOL RATINGS UNIT

Input Voltage VPP, VIN 7 V

Power Dissipation PD Internally limited

Junction Temperature TJ 150 °C

Ambient Operation Temperature TOPR -40~ +85 °C

Storage Temperature TSTG -65~ +150 °C

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 UNIT

VIN Voltage VIN 1.4 ~5.5 V

VPP Voltage VPP 4.5~5.5 V

Ambient Operation Temperature TOPR -40°C ≤TOPR ≤ +85°C °C

 THERMAL DATA

PARAMETER SYMBOL RATINGS UNIT

Junction to Ambient SOP-8 θJA 150 °C/W

HSOP-8 143 °C/W

Junction to Case SOP-8 θJC 20 °C/W

HSOP-8 14 °C/W

 ELECTRICAL CHARACTERISTICS

VPP=5V, VIN =3.3V, VEN=VPP, IOUT =10mA, CIN=10µF, COUT =10µF, TA=TJ=25°C, unless otherwise specified.

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT

VIN

Input Voltage Range VIN 1.4 5.5 V

Quiescent Current (Ground Current) IQ V

OUT=2.5V 1 2 mA

VPP

VPP Voltage Range VPP 4.5 5.5 V

VPP Current IPPH V

OUT =2.5V 0.23 0.5 mA

IPPL V

EN=0V 36 60 μA

VOUT

Output Voltage (Internal Fixed Voltage) VOUT V

IN= VOUT +0.5V, VOUT =2.5V 2.45 2.5 2.55 V

Line Regulation OUTIN

OUT

V×ΔV

ΔVVIN=( VOUT +0.5V) ~ 5V 0.2 1 %

Load Regulation ΔVOUT 10mA≤IOUT≤2A 0.2 1 %

Dropout Voltage VD I

OUT=2A 300 420 mV

Short Circuit Current 1.4 A

VOUT Pull Low Resistance VEN=0V 90 Ω

ADJ

Reference Voltage VREF V

ADJ= VOUT 0.788 0.8 0.812 V

Adjust Pin Current IADJ 20 100 nA

Adjust Pin Threshold 0.15 0.2 0.25 V

VEN

VEN Pin Voltage High VH

(

EN

)

1.6 V

VEN Pin Voltage Low VL

(

EN

)

0.4 V

VEN Pin Bias Current IBIAS

(

EN

)

V

EN=0V 12 40 μA

POK

VOUT Power OK Voltage VTHPOK 92 %

Hysteresis VHYPOK 7 %

OVER TEMPERATURE PROTECTION

Over Temperature TOT 150 °C

Over Temperature Hysteresis TOTHY 30 °C

Note: Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible.

LR18120 CMOS IC

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 TYPICAL APPLICATION CIRCUIT

R2

R2)+0.8(R1

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 TYPICAL CHARACTERISTICS (VCC= 3.3V, TA=25°C, unless otherwise specified.)

3 3.5 4 4.5 5 5.5

Input Voltage, VIN (v)

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

Quiescent Current, IQ(mA)

Quiescent Current vs. Input Voltage

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

Quiescent Current, IQ(mA)

-45-35-25-15 -5 5 15 25 35 45 55 65 75 85

Temperature (°C)

Quiescent Current vs. Temperature

3 3.5 4 4.5 5 5.5

Input Voltage, VIN (v)

0

0.1

0.05

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

IPPH Current, IIPPH (mA)

IPPH Current vs. Input Voltage

-45-35-25-15 -5 5 15 25 35 45 55 65 75 85

Temperature (°C)

0

0.1

0.05

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

IPPH Current, IIPPH (mA)

IPPH Current vs. Temperature

3 3.5 4 4.5 5 5.5

Input Voltage, VIN (v)

0

5

10

15

20

25

30

35

40

IPPL Current, IIPPL (µA)

IPPL Current vs. Input Voltage

-45-35-25-15 -5 5 15 25 35 45 55 65 75 85

Temperature (°C)

0

5

10

15

20

25

30

35

40

IPPL Current, IIPPL (µA)

IPPL Current vs. Temperature

LR18120 CMOS IC

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 TYPICAL CHARACTERISTICS(Cont.)

3 3.5 4 4.5 5 5.5

Input Voltage, VIN (v)

2.45

2.46

2.47

2.48

2.49

2.5

2.51

2.52

2.53

2.54

2.55

Output Voltage, VO(V)

Output Voltage vs. Input Voltage

IO=0A

3 3.5 4 4.5 5 5.5

Input Voltage, VIN (v)

0.788

0.792

0.796

0.8

0.804

0.808

0.812

Reference Voltage, VREF (V)

Reference Voltage vs. Input Voltage

0

0.5

1.5

2.5

3.5

1

3

Max. Dissipation Power, PD(W)

2

0123450.5 1.5 2.5 3.5 4.5

PCB Top Copper Area (in2)

Max. Power Dissipation vs.

PCB Top Copper Area

25 35 45 55 35 75 85

TAMB (°C)

0

0.5

1.5

2.5

3.5

1

3

Max. Dissipation Power, PD(W)

2

Max. Power Dissipation vs.TAMB (still air)

A=5.0 in2

A=4.5 in2

A=4.0 in2

A=3.5 in2

A=3.0 in2

A=2.5 in2A=2.0 in2

A=1.5 in2

A=1.0 in2

A=0.5 in2

Load Transient

VOUT

IOUT

VIN=3.3V,VOUT=2.5V,IOUT=0 to 2A

Stop

Short Circuit Current

Stop

LR18120 CMOS IC

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 TYPICAL CHARACTERISTICS(Cont.)

VIN Start up Waveform

VOUT

VIN

Tek Stop

Stop

VPP

VPP Start up Waveform

VOUT

VIN

VPP

Tek Stop

VEN Start up Waveform

VOUT

VIN

VEN

VPP

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.