IRU1120 [INFINEON]

2A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR; 2A低压差正可调稳压


型号：	IRU1120
厂家：	Infineon
描述：	2A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR 2A低压差正可调稳压
文件：	总9页 (文件大小：63K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Data Sheet No. PD94402

IRU1120

2A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR

PRELIMINARY DATA SHEET

FEATURES

DESCRIPTION

Stable with ceramic capacitor

Guaranteed < 1.3V Dropout at Full Load Current

Fast Transient Response

The IRU1120 is an adjustable linear voltage regulator. It

is packaged in a 5-pin ultra thin-pak surface mount pack-

age. The adjustable output voltage can be set from 1.25V

and up using a simple resistor divider. The input power

can be supplied by a single 5V supply. The regulator is

capable of supplying 2 Amps of continuous current with

an input voltage of 5V. The output is protected by both

current limit and thermal shutdown circuits.

2% Voltage Reference Initial Accuracy

Output Current Limiting

Built-In Thermal Shutdown

APPLICATIONS

High Efficiency Linear Regulator

Hard Disk Drivers, CD-ROMs, DVDs

ADSL and Cable Modems

TYPICAL APPLICATION

2.5V @ 2A

ADJ

4.7uF

X5R

VOUT

IRU1120

Gnd 3

VCTRL

3.3V

4.7uF

X5R

4.7uF

X5R

Figure 1 - Typical application of IRU1120.

PACKAGE ORDER INFORMATION

T_A(°C)

0 To 125

DEVICE

IRU1120CP

PACKAGE

5-Pin Ultra Thin-Pak^TM(P)

OUTPUT

Adjustable

Rev. 1.3

08/20/02

www.irf.com

IRU1120

ABSOLUTE MAXIMUM RATINGS

Input Voltage (VIN) .................................................... 10V

Input Voltage (VCTRL) ................................................. 10V

Operating Junction Temperature Range ..................... -40°C To 150°C

Operating Ambient Temperature Range ..................... -40°C To 125°C

Storage Temperature Range ...................................... -65°C To 150°C

PACKAGE INFORMATION

5-Pin Ultra Thin-Pak^TM(P)

FRONTVIEW

ADJ

VOUT

Tab is

Gnd

VIN

VCTRL

θJA=308C/W for 1" Square Pad

ELECTRICAL SPECIFICATIONS

Unless otherwise specified, these specifications apply over CIN=CCTRL=COUT=4.7µF. Typical values refer to TJ=258C

unless otherwise noted. IFL=2A. VADJ is connected to VOUT and VIN=VCTRL=5V unless otherwise noted.

PARAMETER

SYM

VOUT Io=10mA, TJ=258C

Io=10mA, 08C< TJ<1258C

TEST CONDITION

MIN

TYP

MAX UNITS

Output Voltage

1.225

1.213

1.25 1.275

1.25 1.287

Line Regulation

RegLINE Io=10mA, Vo+1.3V<VIN=VCTRL<10V

Io=10mA, VIN=VCTRL=2.6 to 10V for

0.5

0.7

%Vo

the following:

08C< TJ<1258C

1.13

1.4

1.25

-408C< TJ<1258C

Load Regulation

Dropout Voltage

RegLOAD Note 1, 10mA<Io<2A for the

following: 08C< TJ<1258C

-408C< TJ<1258C

VDO1 Note 2, Io=1A, VCTRL=5V,

VO+VDO1<VIN<3.3V for the following:

08C< TJ<1258C

0.2

0.3

0.4

0.63

0.9

%Vo

0.48

0.6

-408C< TJ<1258C

Dropout Voltage

VDO2 Note 2, Io=1.5A, VCTRL=5V,

VO+VDO2<VIN<3.3V for the following:

08C< TJ<1258C

0.75

0.94

-408C< TJ<1258C

VDO3 Note 2, Io=2A, VCTRL=5V,

VO+VDO3<VIN<3.3V for the following:

08C< TJ<1258C

1.1

1.25

1.2

-408C< TJ<1258C

VDO4 Note 2, Io=1A, VCTRL=VIN for the

1.27

following:

08C< TJ<1258C

1.05

1.2

-408C< TJ<1258C

Rev. 1.3

08/20/02

www.irf.com

IRU1120

PARAMETER

SYM

TEST CONDITION

MIN

TYP

MAX UNITS

Dropout Voltage

VDO5 Note 2, Io=1.5A, VCTRL=VIN for the

following:

08C< TJ<1258C

-408C< TJ<1258C

1.2

1.3

1.35

1.5

Dropout Voltage

VDO6 Note 2, Io=2A, VCTRL=VIN for the

following:

08C< TJ<1258C

-408C< TJ<1258C

1.35

1.44

Current Limit

IOL

∆VO1=10% Below Regulation

IO(min) Note 3, 5

2.3

Minimum Load Current

Thermal Regulation

RegTHERM Note 5, 30ms pulse, Io=IFL

0.1

%/W

Ripple Rejection (Vcc to Output) PSRR Note 5, 100Hz<f<100KHz, Io=20mA

Temperature Stability

Long Term Stability

RMS Output Noise

Vcc Quiescent Current

StabTEMP Note 4, 5, Io=10mA

StabLONG Note 5

0.5

0.3

0.003

%Vo

IQ1

Note 5, 10Hz<f<10KHz

Io=0mA

Note 1: Low duty cycle pulse testing with Kelvin con- Note 3: Minimum load current is defined as the mini-

nections is required in order to maintain accurate data. mum current required at the output in order for the out-

put voltage to maintain regulation.

Note 2: Dropout voltage is defined as the minimum dif-

ferential voltage between VIN and VOUT required to main- Note 4: Temperature stability is the change in output

tain regulation at VOUT. It is measured when the output from nominal over the operating temperature range.

voltage drops 1% below its nominal value.

Note 5: Guaranteed by design, but not tested in produc-

tion.

PIN DESCRIPTIONS

PIN # PIN SYMBOL

PIN DESCRIPTION

VCTRL

The control input pin of the regulator. This pin is connected to the 5V supply to provide

base current for the pass transistor of the regulator. This allows the regulator to have very

low dropout voltage, enabling use with low values of VIN. A 1µF high frequency capacitor

is connected from this pin to VIN to ensure stability.

VIN

The power input pin of the regulator. A minimum of input capacitance must be connected

from this pin to ground to insure that the input voltage does not sag below the minimum

dropout voltage during the load transient response. This pin must always be higher than

the VOUT pin by the amount of dropout voltage (see data sheet) in order for the device to

regulate properly.

Gnd

VOUT

This pin is connected with ground. It is also the tab of the package.

The output of the regulator. A minimum of output capacitance must be connected from

this pin to ground to insure stability.

VADJ

A resistor divider from this pin to the VOUT pin and to ground sets the output voltage. See

application section for divider setting recommendations and a circuit example.

Rev. 1.3

08/20/02

www.irf.com

IRU1120

BLOCK DIAGRAM

VIN 2

4 VOUT

5 VADJ

3 Gnd

VCTRL

CURRENT

LIMIT

1.25V

THERMAL

SHUTDOWN

Figure 2 - Simplified block diagram of the IRU1120.

APPLICATION INFORMATION

Introduction

VOUT = VREF× 1+

+IADJ×R1

( )

The IRU1120 adjustable regulator is a five-terminal de-

vice designed specifically to provide extremely low drop-

out voltages comparable to the PNP type without the

disadvantage of the extra power dissipation due to the

base current associated with PNP regulators. This is

done by bringing out the control pin of the regulator that

provides the base current to the power NPN and con-

necting it to a voltage that is grater than the voltage present

at the VIN pin. This flexibility makes the IRU1120 ideal

for applications where dual inputs are available such as

a computer mother board with an ATX style power sup-

ply that provides 5V and 3.3V to the board.

Where:

VREF = 1.25V Typically

IADJ < 1µA Typically

R1 and R2 as shown in Figure 3:

VOUT

VIN

VOUT

IRU1120

VCTRL

CTRL

Gnd

Adj

IADJ = 1uA

The IRU1120 is specifically designed to meet the fast

current transient needs as well as providing an accurate

initial voltage, reducing the overall system cost with the

need for fewer number of output capacitors.

Figure 3 - Typical application of the IRU1120

for programming the output voltage.

Output Voltage Setting

The IRU1120 keeps a constant 1.25V between the ad-

The IRU1120 can be programmed to any voltage in the just pin and the ground pin. By replacing a resistor (R2),

range of 1.25V to 5.5V by using two external resistors. between these two pins, a constant current flows through

The output voltage is defined as:

R1, subtracting the IADJ current out of the R1 to set the

overall output voltage. Notice that since the IADJ is typi-

cally in the range of 1µA, it only adds a small error to

the output voltage which is negligible.

Rev. 1.3

08/20/02

www.irf.com

IRU1120

Thermal Protection

Assuming, the following conditions:

When the junction temperature exceeds 1508C, the in-

ternal thermal protection shuts the IRU1120 down.

VOUT = 2.7V

VIN = 3.3V

VCTRL = 5V

IOUT = 1A (DC Avg)

Current Limit Protection

The IRU1120 provides Over Current Protection when the

output current exceeds typically 3A. The output de- Calculate the maximum power dissipation using the fol-

creases to limit the power dissipation.

lowing equation:

IOUT

PD = IOUT×(VIN - VOUT)+

×(VCTRL - VOUT)

Stability

( ₆₀)

The IRU1120 requires the use of an output capacitor as

part of the frequency compensation in order to make the

regulator stable. A minimum input capacitance of 4.7µF

and a minimum output capacitance 4.7µF Ceramic ca-

PD = 1×(3.3 - 2.7)+

×(5 - 2.7) = 0.63W

(₆₀)

pacitor is needed for regulator stage as well as the speci- For Ultra Thin-Pak^TMwe have:

fied minimum loads to guarantee stability.

RTHJA = 258C/W

TA = 458C

Transient Response and PSRR

∆T = PD×RTHJA = 0.63×25 = 15.758C

TJ = TA + ∆T = 60.758C

The input and output capacitors are critical in order to

ensure good transient response and PSRR. The most

important aspects of this are capacitor selection, place-

ment and trace routing. Place each capacitor as close Layout Consideration

as physically possible to its corresponding regulator pin. The IRU1120, like many other high-speed regulators,

Use wide traces for a low inductance path. Couple di- requires that the output capacitors be close to the de-

rectly to the ground and power planes as possible. The vice for stability. For power consideration, a ground plane

use of low ESR capacitors is crucial to achieving good pad of approximately one-inch square on the compo-

results. Larger capacitance and lower ESR will improve nent side must be dedicated to the device where all Gnd

both PSRR and transient response.

pins are connected to dissipate the power. If a multilayer

board is used, it is recommended that the inner layers of

the board are also dedicated to the size of the pad for

Thermal Design

The IRU1120 incorporates an internal thermal shutdown better thermal characteristics.

that protects the device when the junction temperature

exceeds the allowable maximum junction temperature.

Although this device can operate with junction tempera-

tures in the range of 1508C, it is recommended that the

selected heat sink be chosen such that during maxi-

mum continuous load operation the junction tempera-

ture is kept below this number. The example below shows

the steps in selecting the proper surface mount pack-

age.

Rev. 1.3

08/20/02

www.irf.com

IRU1120

TYPICAL CHARACTERISTICS

IRU1120 Voltage Dropout Over Temperature

1.400

1.200

1.000

0.800

0.600

0.400

0.200

0.000

-40°C

-25°C

0°C

25°C

50°C

75°C

100°C

125°C

Vctrl=5V, VinDO @ 2A

Vctrl=5V, VinDO @ 1.5A

Vctrl=5V, VinDO @ 1A

Figure 4 - Voltage dropout over temperature @ VCTRL=5V.

IRU1120 Voltage Dropout over Temperature

1.500

1.400

1.300

1.200

1.100

1.000

0.900

-40°C -25°C 0°C

Vin=Vctrl, 2A

25°C 50°C 75°C 100°C 125°C 150°C

Vin=Vctrl, 1.5A Vin=Vctrl, 1A Vin=Vctrl, 0.5A

Figure 5 - Voltage dropout over temperature @ VIN=VCTRL.

IRU1120 Current Limit over Temperature

3.40

3.20

3.00

2.80

2.60

I Limit @ 5V/5V

I Limit @ 3.3V/5V

Figure 6 - Current limit over temperature @ VCTRL=VIN=5V and VCTRL=5V and VIN=3.3V

Rev. 1.3

08/20/02

www.irf.com

IRU1120

TEST DATA FOR IRU1120

Figure 7- Load transient response @ IOUT 0 to 1A,

VIN=VCTRL=5V, VOUT=2.5V,

Figure 8- Load Transient response @ IOUT 0 to 2A,

VIN=VCTRL=5V, VOUT=2.5V,

CIN=CCTRL=COUT=4.7µF, Ceramic.

Ch1: VOUT (100mV/Div).

CIN=CCTRL=COUT=4.7µF, Ceramic.

Ch1: VOUT (100mV/Div).

Ch2: IOUT (0.5A/Div).

Ch2: IOUT (1A/Div).

Figure 9- Current Limit Characteristic, VIN=VCTRL=5V,

VOUT=2.5V, CIN=CCTRL=COUT=4.7uF, Ceramic.

Ch1: VOUT (2V/Div).

Ch2: Shorted Current (IOUT) (1A/Div).

IR WORLD HEADQUARTERS:233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105

TAC Fax: (310) 252-7903

Visit us at www.irf.com for sales contact information

Data and specifications subject to change without notice. 02/01

Rev. 1.3

08/20/02

www.irf.com

IRU1120

(P) Ultra Thin-Pak^TM

5-Pin

SYMBOL

MIN

9.27

8.89

7.87

1.78

0.63

MAX

9.52

9.14

8.13

2.03

0.79

0.25 NOM

1.72

10.41 10.67

0.76

0.03

0.89

1.27

0.13

1.14

0.25

0.79

1.04

5.59 NOM

7.49 NOM

NOTE: ALL MEASUREMENTS

ARE IN MILLIMETERS.

Rev. 1.3

08/20/02

www.irf.com

IRU1120

PACKAGE SHIPMENT METHOD

PKG

PACKAGE

PARTS

T & R

DESIG

DESCRIPTION

COUNT

PER TUBE

PER REEL

Orientation

Ultra Thin-Pak^TM

2500

Fig A

Feed Direction

Figure A

IR WORLD HEADQUARTERS:233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105

TAC Fax: (310) 252-7903

Visit us at www.irf.com for sales contact information

Data and specifications subject to change without notice. 02/01

Rev. 1.3

08/20/02

www.irf.com

IRU1120 [INFINEON]

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