RC1585D-1.5 [FAIRCHILD]

Fixed Positive LDO Regulator, 1.5V, 1.3V Dropout, BIPolar, PSSO2, PLASTIC, TO-252, 3 PIN;


型号：	RC1585D-1.5
厂家：	FAIRCHILD SEMICONDUCTOR
描述：	Fixed Positive LDO Regulator, 1.5V, 1.3V Dropout, BIPolar, PSSO2, PLASTIC, TO-252, 3 PIN 输出元件调节器
文件：	总13页 (文件大小：96K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

www.fairchildsemi.com

RC1585

5A Adjustable/Fixed Low Dropout Linear Regulator

Features

Description

• Fast transient response

The RC1585 and RC1585-1.5 are low dropout three-terminal

regulators with 5A output current capability. These devices

have been optimized for low voltage applications including

• Low dropout voltage at up to 5A

• Load regulation: 0.05% typical

• Trimmed current limit

bus termination, where transient response and mini-

• On-chip thermal limiting

• Standard TO-220, TO-263, TO-263 center cut and TO-252

packages

mum input voltage are critical. The RC1585 is ideal for low

voltage microprocessor applications requiring a regulated

output from 1.5V to 3.6V with an input supply of 5V or less.

The RC1585-1.5 offers ﬁxed 1.5V with 5A current capabili-

ties for GTL+ bus V termination.

Applications

• Pentium^®class GTL+ bus supply

• Low voltage logic supply

Current limit is trimmed to ensure speciﬁed output current

and controlled short-circuit current. On-chip thermal limit-

ing provides protection against any combination of overload

and ambient temperature that would create excessive junc-

tion temperatures.

• Post regulator for switching supply

The RC1585 series regulators are available in the industry-

standard TO-220, TO-263, TO-263 center cut and TO-252

power packages.

Typical Applications

RC1585

OUT

= 3.3V

1.5V at 5A

ADJ

10µF

22µF

124Ω

24.9Ω

RC1585-1.5

= 3.3V

OUT

1.5V at 5A

GND

22µF

10µF

65-1585-01a

Pentium is a registered trademark of Intel Corporation.

REV. 1.1.4 10/8/02

RC1585

PRODUCT SPECIFICATION

Pin Assignments

RC1585T

RC1585T-1.5

FRONT VIEW

RC1585M-1.5

FRONT VIEW

RC1585M

FRONT VIEW

GND OUT IN

ADJ OUT IN

GND OUT IN

3-Lead Plastic TO-263

= 3°C/W*

3-Lead Plastic TO-220

= 3°C/W

RC1585MC-1.5

FRONT VIEW

RC1585MC

FRONT VIEW

RC1585D-1.5

FRONT VIEW

RC1585D

FRONT VIEW

Tab is Out.

GND

ADJ

GND

ADJ

3-Lead Plastic TO-263 Center Cut

= 3°C/W*

3-Lead Plastic TO-252

= 3°C/W*

65-1585-02

* θ can vary from 20°C/W to >40°C/W with various mounting techniques.

Absolute Maximum Ratings

Parameter

Min.

Max.

Unit

Operating Junction Temperature Range

Storage Temperature Range

125

150

300

°C

-65

Lead Temperature (Soldering, 10 sec.)

REV. 1.1.4 10/8/02

PRODUCT SPECIFICATION

RC1585

Electrical Characteristics

Tj = 25°C unless otherwise speciﬁed.

The • denotes speciﬁcations which apply over the speciﬁed operating temperature range.

Parameter

Conditions

Min.

Typ.

Max

Units

Reference Voltage³

1.5V ≤ (V – V

) ≤ 5.75V,

•

1.225

(-2%)

1.250

1.275

(+2%)

OUT

≤ 5A

10mA ≤ I

OUT

Output Voltage⁴

3V ≤ V ≤ 7V

1.47

1.5

0.005

0.05

1.53

10mA ≤ I

≤ 5A

OUT

Line Regulation^{1, 2}

Load Regulation^{1, 2, 3}

OUT

+ 1.5V) ≤ V ≤ 7V,

0.2

= 10mA

OUT

(V – V

10mA ≤ I

OUT

) = 3V,

≤ 5A

0.5

IN OUT

Dropout Voltage

Current Limit

Adjust Pin Current³

∆V

= 1%, I

= 5A

•

1.150

5.5

1.300

REF

OUT

(V – V

IN OUT

) = 2V

5.1

120

µA

Adjust Pin Current Change³1.5V ≤ (V – V

) ≤ 5.75V,

) ≤ 5.75V

0.2

OUT

10mA ≤ I

OUT

≤ 5A

Minimum Load Current

Quiescent Current

Ripple Rejection

1.5V ≤ (V – V

•

OUT

= 5V

f = 120Hz, C

(V – V

= 22µF Tantalum,

) = 3V, I = 5A

OUT

OUT OUT

Thermal Regulation

Temperature Stability

Long-Term Stability

RMS Output Noise

T = 25°C, 30ms pulse

0.004

0.5

0.02

1.0

%/W

•

T = 125°C, 1000 hrs.

0.03

0.003

T = 25°C, 10Hz ≤ f ≤ 10kHz

(% of V

)

OUT

Thermal Resistance,

Junction to Case

TO-220

°C/W

°C

TO-263, TO-252

Thermal Shutdown

150

Notes:

1. See thermal regulation specifications for changes in output voltage due to heating effects. Load and line regulation are

measured at a constant junction temperature by low duty cycle pulse testing.

2. Line and load regulation are guaranteed up to the maximum power dissipation (18W). Power dissipation is determined by

input/output differential and the output currrent. Guaranteed maximum output power will not be available over the full input/

output voltage range.

3. RC1585 only.

4. RC1585-1.5 only.

REV. 1.1.4 10/8/02

RC1585

PRODUCT SPECIFICATION

Typical Performance Characteristics

0.10

0.05

1.5

1.4

1.3

1.2

1.1

∆I = 5A

-0.05

-0.10

-0.15

-0.20

1.0

0.9

0.8

0.7

0.6

0.5

T=0°C

T=125°C

T=25°C

-75 -50 -25

25 50 75 100 125 150 175

JUNCTION TEMPERATURE (°C)

OUTPUT CURRENT (A)

Figure 1. Dropout Voltage vs. Output Current

Figure 2. Load Regulation vs. Temperature

1.275

1.270

1.265

1.260

1.255

1.250

1.245

1.240

1.235

1.230

1.225

3.70

OUT

SET WITH 1% RESISTORS

OUT

= 3.6V¹

3.65

3.60

3.55

3.50

3.45

3.40

3.35

3.30

3.25

3.20

= 3.3V¹

OUT

Note:

1. RC1585 Only

-75 -50 -25

25 50 75 100 125 150 175

-75 -50 -25

25 50 75 100 125 150 175

JUNCTION TEMPERATURE (°C)

Figure 3. Reference Voltage vs. Temperature

Figure 4. Output Voltage vs. Temperature

100

Note:

1. RC1585 Only

-75 -50 -25

25 50 75 100 125 150 175

-75 -50 -25

25 50 75 100 125 150 175

JUNCTION TEMPERATURE (°C)

Figure 5. Minimum Load Current vs. Temperature

Figure 6. Adjust Pin Current vs. Temperature

REV. 1.1.4 10/8/02

PRODUCT SPECIFICATION

RC1585

Typical Performance Characteristics (continued)

8.0

7.0

6.0

5.0

4.0

(V – V

) ≤ 3V

RIPPLE

OUT

0.5V ≤ V

≤ 2V

= 5A

OUT

100

FREQUENCY (Hz)

Figure 8. Ripple Rejection vs. Frequency

10K

100K

-75 -50 -25

25 50 75 100 125 150 175

JUNCTION TEMPERATURE (°C)

Figure 7. Short-Circuit Current vs. Temperature

50 60 70 80 90 100 110 120 130 140 150

CASE TEMPERATURE (°C)

Figure 9. Maximum Power Dissipation

REV. 1.1.4 10/8/02

RC1585

PRODUCT SPECIFICATION

Applications Information

General

1N4002

(OPTIONAL)

The RC1585 and RC1585-1.5 are three-terminal regulators

optimized for GTL+ V termination and logic applica-

tions. These devices are short-circuit protected and offer

thermal shutdown to turn off the regulator when the junction

temperature exceeds about 150°C. The RC1585 series pro-

vides low dropout voltage and fast transient response. Fre-

quency compensation uses capacitors with low ESR while

still maintaining stability. This is critical in addressing the

needs of low voltage high speed microprocessor buses like

GTL+.

RC1585

OUT

10µF

ADJ

22µF

ADJ

Stability

The RC1585 series requires an output capacitor as a part of

the frequency compensation. It is recommended to use a

22µF solid tantalum or a 100 µF aluminum electrolytic on

the output to ensure stability. The frequency compensation of

these devices optimizes the frequency response with low

ESR capacitors. In general, it is suggested to use capacitors

with an ESR of <300mΩ. It is also recommended to use

bypass capacitors such as a 22µF tantalum or a 100µF alumi-

num on the adjust pin of the RC1585 for low ripple and fast

transient response. When these bypassing capacitors are not

used at the adjust pin, larger values of output capacitors pro-

vide equally good results.

1N4002

(OPTIONAL)

RC1585-1.5

OUT

10µF

22µF

GND

65-1585-12

Figure 10. Optional Protection

Protection Diodes

Ripple Rejection

In normal operation, the RC1585 series does not require any

protection diodes. For the RC1585, internal resistors limit

internal current paths on the adjust pin. Therefore, even with

bypass capacitors on the adjust pin, no protection diode is

needed to ensure device safety under short-circuit condi-

tions.

In applications that require improved ripple rejection, a

bypass capacitor from the adjust pin of the RC1585 to

ground reduces the output ripple by the ratio of V

/1.25V.

OUT

The impedance of the adjust pin capacitor at the ripple fre-

quency should be less than the value of R1 (typically in the

range of 100Ω to 120Ω) in the feedback divider network in

Figure 10. Therefore, the value of the required adjust pin

capacitor is a function of the input ripple frequency. For

example, if R1 equals 100Ω and the ripple frequency equals

120Hz, the adjust pin capacitor should be 22µF. At 10kHz,

only 0.22µF is needed.

A protection diode between the input and output pins is

usually not needed. An internal diode between the input and

the output pins on the RC1585 series can handle micro-

second surge currents of 50A to 100A. Even with large value

output capacitors it is difﬁcult to obtain those values of surge

currents in normal operation. Only with large values of

output capacitance, such as 1000µF to 5000µF, and with the

input pin instantaneously shorted to ground can damage

occur. A crowbar circuit at the input can generate those

levels of current; a diode from output to input is then recom-

mended, as shown in Figure 10. Usually, normal power sup-

ply cycling or system “hot plugging and unplugging” will

not generate current large enough to do any damage.

Output Voltage

The RC1585 regulator develops a 1.25V reference voltage

between the output pin and the adjust pin (see Figure 11).

Placing a resistor R1 between these two terminals causes a

constant current to ﬂow through R1 and down through R2 to

set the overall output voltage. Normally, this current is the

speciﬁed minimum load current of 10mA.

The current out of the adjust pin adds to the current from R1

and is typically 35µA. Its output voltage contribution is

small and only needs consideration when a very precise out-

put voltage setting is required.

The adjust pin can be driven on a transient basis ±±V with

respect to the output, without any device degradation. As

with any IC regulator, exceeding the maximum input-to-

output voltage differential causes the internal transistors to

break down and none of the protection circuitry is then

functional.

REV. 1.1.4 10/8/02

PRODUCT SPECIFICATION

RC1585

OUT

PARASITIC

LINE RESISTANCE

RC1585

OUT

10µF

22µF

ADJ

REF

ADJ

35µA

R1*

R2*

65-1585-13

= V

(1 + R2/R1) + I

REF ADJ

(R2)

OUT

*CONNECT R1 TO CASE

CONNECT R2 TO LOAD

Figure 11. Basic Regulator Circuit

Load Regulation

65-1585-15

It is not possible to provide true remote load sensing because

the RC1585 series are three-terminal devices. Load regula-

tion is limited by the resistance of the wire connecting the

regulators to the load. Load regulation per the data sheet

speciﬁcation is measured at the bottom of the package.

Figure 13. Connection for Best Load Regulation

Thermal Considerations

The RC1585 series protect themselves under overload condi-

tions with internal power and thermal limiting circuitry.

However, for normal continuous load conditions, do not

exceed maximum junction temperature ratings. It is impor-

tant to consider all sources of thermal resistance from junc-

tion-to-ambient. These sources include the junction-to-case

resistance, the case-to-heat sink interface resistance, and the

heat sink resistance. Thermal resistance speciﬁcations have

been developed to more accurately reﬂect device tempera-

ture and ensure safe operating temperatures.

For ﬁxed voltage devices, negative side sensing is a true

Kelvin connection with the ground pin of the device returned

to the negative side of the load. This is illustrated in

Figure 12.

PARASITIC

LINE RESISTANCE

RC1585-1.5

IN OUT

GND

For example, look at using an RC1585T to generate 5A @

1.5V ± 2% from a 3.3V source (3.2V to 3.6V).

65-1585-14

Assumptions:

Figure 12. Connection for Best Load Regulation

• V = 3.6V worst case

For adjustable voltage devices, negative side sensing is a true

Kelvin connection with the bottom of the output divider

returned to the negative side of the load. The best load regu-

lation is obtained when the top of the resistor divider R1 con-

nects directly to the regulator output and not to the load.

Figure 13 illustrates this point.

• V

• I

OUT

= 1.46V worst case

= 5A continuous

OUT

• T = 60°C

• θ

= 3°C/W (assuming both a heatsink and

Case-to-Ambient

a thermally conductive material)

The power dissipation in this application is:

If R1 connects to the load, then the effective resistance

between the regulator and the load would be:

= (V – V

) * (I ) = (3.6 – 1.46) * (5) = 10.±W

OUT

IN OUT

R x (1 + R2/R1), R = Parasitic Line Resistance

From the speciﬁcation table:

The connection shown in Figure 13 does not multiply R by

the divider ratio. As an example, R is about four milliohms

T = T + (P ) * (θ

Case-to-Ambient

+ θ )

= 60 + (10.±) * (3 + 3) = 120°C

per foot with 16-gauge wire. This translates to 4mV per foot

at 1A load current. At higher load currents, this drop repre-

sents a signiﬁcant percentage of the overall regulation. It is

important to keep the positive lead between the regulator and

the load as short as possible and to use large wire or PC

board traces.

The junction temperature is below the maximum rating.

REV. 1.1.4 10/8/02

RC1585

PRODUCT SPECIFICATION

Junction-to-case thermal resistance is speciﬁed from the IC

junction to the bottom of the case directly below the die. This

is the lowest resistance path for heat ﬂow. Proper mounting

ensures the best thermal ﬂow from this area of the package to

the heat sink. Use of a thermally conductive material at the

case-to-heat sink interface is recommended. Use a thermally

conductive spacer if the case of the device must be electri-

cally isolated and include its contribution to the total thermal

resistance. The cases of the RC1585 series are directly con-

nected to the output of the device.

RC1585

3.3V

1.5V

OUT

124Ω

ADJ

10µF

100µF

24.9Ω

100µF

65-1586-16

Figure 14. Application Circuit (RC1585)

Table 1. Bill of Materials for Application Circuit for the RC1585

Item

Quantity

Manufacturer

Xicon

Part Number

L10V10

Description

10µF, 10V Aluminum

100µF, 10V Aluminum

124Ω, 1%

C2, C3

Xicon

L10V100

Generic

Fairchild

24.9Ω, 1%

RC1585T

5A Regulator

RC1585-1.5

OUT

1.5V

OUT

3.3V

GND

10µF

100µF

65-1585-17

Figure 15. Application Circuit (RC1585-1.5)

Table 2. Bill of Materials for Application Circuit for the RC1585-1.5

Item

Quantity

Manufacturer

Xicon

Part Number

L10V10

Description

10µF, 10V Aluminum

100µF, 10V Aluminum

5A Regulator

Xicon

L10V100

Fairchild

RC1585T-1.5

REV. 1.1.4 10/8/02

PRODUCT SPECIFICATION

RC1585

Mechanical Dimensions

3-Lead TO-263 Package

Notes:

Inches

Millimeters

1. Dimensions are exclusive of mold flash and metal burrs.

Symbol

Notes

2. Standoff-height is measured from lead tip with ref. to Datum -B-.

3. Foot length is measured with ref. to Datum -A- with lead surface

(at inner R).

4. Dimensiuon exclusive of dambar protrusion or intrusion.

5. Formed leads to be planar with respect to one another at seating

place -C-.

Min.

Max.

Min.

Max.

.160

.020

.049

.045

.340

.380

.190

.036

.051

.055

.380

.405

4.06

0.51

1.25

1.14

8.64

9.65

4.83

0.91

1.30

1.40

9.65

10.29

.100 BSC

2.54 BSC

.575

.090

—

.017

0°

.625

14.61

2.29

—

0.43

0°

15.88

2.79

1.40

0.78

8°

.110

.055

.019

8°

@PKG/

@HEATSINK

E-PIN

R (2 PLCS)

-B- -A-

-C-

REV. 1.1.4 10/8/02

RC1585

PRODUCT SPECIFICATION

Mechanical Dimensions (continued)

3-Lead TO-263 Center Cut Package

Notes:

Inches

Millimeters

1. Dimensions are exclusive of mold flash and metal burrs.

2. Standoff-height is measured from lead tip with ref. to Datum -B-.

3. Foot length is measured with ref. to Datum -A- with lead surface

(at inner R).

4. Dimensiuon exclusive of dambar protrusion or intrusion.

5. Formed leads to be planar with respect to one another at seating

place -C-.

Symbol

Notes

Min.

Max.

Min.

Max.

.160

.020

.049

.045

.340

.380

.190

.036

.051

.055

.380

.405

4.06

0.51

1.25

1.14

8.64

9.65

4.83

0.91

1.30

1.40

9.65

10.29

.100 BSC

2.54 BSC

.575

.625

.110

.055

14.61

15.88

.090

—

2.29

—

2.79

1.40

1.78

0.78

8°

.050

.017

0°

1.27

0.43

0°

.070

.019

8°

@PKG/

@HEATSINK

E-PIN

R (2 PLCS)

-B- -A-

-C-

REV. 1.1.4 10/8/02

PRODUCT SPECIFICATION

RC1585

Mechanical Dimensions (continued)

3-Lead TO-220 Package

Inches

Millimeters

Symbol

Notes

Min.

Max.

Min.

Max.

.140

.015

.045

.014

.139

.560

.380

.090

.190

.045

.190

.040

3.56

.38

4.83

1.02

øP

1.14

.36

.070

.022

.161

1.78

.56

3.53

14.22

9.65

2.29

4.83

1.14

4.09

.650

.420

.110

.210

—

16.51

10.67

2.79

5.33

—

.020

.230

.060

.055

.270

.115

.51

1.40

6.87

2.92

5.94

2.04

.500

.580

12.70

14.73

.250 BSC

6.35 BSC

.100

.135

2.54

3.43

Notes:

3°

7°

3°

7°

1. Dimension c1 apply for lead finish.

E-PIN

øP

α (5X)

REV. 1.1.4 10/8/02

RC1585

PRODUCT SPECIFICATION

Mechanical Dimensions (continued)

3-Lead TO-252 Package

6.73

6.35

6.00 MIN

5.46

5.21

6.50 MIN

6.25

1.02

0.84

3.00 MIN

2.30

1.14

0.78

1.40 MIN

(0.59)

0.89

4.80

2.29

0.54

4.57

0.25

LAND PATTERN RECOMMENDATION

2.38

2.18

SEE

NOTE D

0.58

0.48

10.41

9.40

SEE

DETAIL A

0.10

NOTES: UNLESS OTHERWISE SPECIFIED

0.51

GAGE PLANE

ALL DIMENSIONS ARE IN MILLIMETERS.

THIS PACKAGE CONFORMS TO JEDEC, TO-252,

ISSUE C. VARIATION AA & AB, DATED NOV. 1999.

0.61

0.48

(1.54)

C) DIMENSIONING AND TOLERANCING PER

10°

0°

ASME Y14.5–1994.

D) HEAT SINK TOP EDGE COULD BE IN CHAMFERED

CORNERS OR EDGE PROTRUSION.

1.78

1.40

DIMENSIONS L3, D, E1 & D1 TABLE:

0.127 MAX

SEATING PLANE

OPTION AA OPTION AB

L3 0.89 – 1.27 1.52 – 2.03

2.90

5.97 – 6.22 5.33 – 5.59

DETAIL A

E1 4.32 MIN

D1 5.21 MIN

3.81 MIN

4.57 MIN

(ROTATED –90°

SCALE 12X

REV. 1.1.4 10/8/02

RC1585

PRODUCT SPECIFICATION

Ordering Information

Product Number

RC1585M

Package

TO-263

RC1585MC

RC1585T

TO-263 Center Cut

TO-220

RC1585D

TO-252

RC1585M-1.5

RC1585MC-1.5

RC1585T-1.5

RC1585D-1.5

TO-263

TO-263 Center Cut

TO-220

TO-252

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY

PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY

LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER

DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES

OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR

CORPORATION. As used herein:

1. Life support devices or systems are devices or systems

which, (a) are intended for surgical implant into the body,

or (b) support or sustain life, or (c) whose failure to perform

when properly used in accordance with instructions for use

provided in the labeling, can be reasonably expected to

result in significant injury to the user.

2. A critical component is any component of a life support

device or system whose failure to perform can be

reasonably expected to cause the failure of the life support

device or system, or to affect its safety or effectiveness.

www.fairchildsemi.com

10/8/02 0.0m 002Stock#DS30001585

 2000 Fairchild Semiconductor Corporation

RC1585D-1.5 [FAIRCHILD]

相关型号：

SI9130DB

SI9135LG-T1

SI9135LG-T1-E3

SI9135_11

SI9136_11

SI9130CG-T1-E3

SI9130LG-T1-E3

SI9130_11

SI9137

SI9137DB

SI9137LG

SI9122E