RC1585M15 [FAIRCHILD]

Fixed Positive LDO Regulator, 1.5V, 1.3V Dropout, BIPolar, PSSO3, PLASTIC, TO-263, 3 PIN;


型号：	RC1585M15
厂家：	FAIRCHILD SEMICONDUCTOR
描述：	Fixed Positive LDO Regulator, 1.5V, 1.3V Dropout, BIPolar, PSSO3, PLASTIC, TO-263, 3 PIN 输出元件调节器
文件：	总12页 (文件大小：82K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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RC1585

5A Adjustable/Fixed Low Dropout Linear Regulator

Description

Features

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 V_TTbus termination,

where transient response and minimum 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 capabilities

for GTL+ bus V_TTtermination.

• Fast transient response

• Low dropout voltage at up to 5A

• Load regulation: 0.05% typical

• Trimmed current limit

• On-chip thermal limiting

• Standard TO-220 and TO-263 packages

Current limit is trimmed to ensure specified output current and

controlled short-circuit current. On-chip thermal limiting provides

protection against any combination of overload and ambient

temperature that would create excessive junction temperatures.

Applications

• Pentium^®Pro and Pentium II GTL+ bus supply

• Low voltage logic supply

• Battery-powered circuitry

• Post regulator for switching supply

The RC1585 series regulators are available in the industry-standard

TO-220 and TO-263 power packages.

Typical Applications

RC1585

V_INV_OUT

V_IN= 3.3V

1.5V at 5A

10µF

22µF

124Ω

ADJ

24.9Ω

RC1585-1.5

V_IN= 3.3V

10µF

1.5V at 5A

V_IN

V_OUT

GND

22µF

Pentium is a registered trademark of Intel Corporation

Rev.

1.0.2

RC1585

SPECIFICATION

PRODUCT

Pin Assignments

RC1585T-1.5

FRONT VIEW

RC1585T

FRONT VIEW

RC1585M-1.5

FRONT VIEW

RC1585M

FRONT

GND OUT IN

ADJ OUT IN

GND OUT IN

3-Lead Plastic TO-263

Θ_JA=30°C/W*

3-Lead Plastic TO-220

Θ_JA=50°C/W

*With package soldered to 0.5 square inch copper area over backside ground plane or internal power

plane. Θ_JAcan vary from 20°C/W to >40°C/W with other mounting techniques.

Absolute Maximum Ratings

Parameter

Min.

Max.

Unit

V_IN

Operating Junction Temperature Range

Control Section

Power Transistor

Storage Temperature Range

Lead Temperature (Soldering, 10 sec.)

-65

125

150

300

°C

PRODUCT SPECIFICATION

RC1585

Electrical Characteristics

Preconditioning: 100% Thermal Limit Functional Test. T_J=25°C unless otherwise specified.

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

Parameter

Conditions

Min.

Typ.

Max.

Units

Reference Voltage³

1.225 1.250 1.275

(-2%)

1.47

1.5V≤ (V_IN-V_OUT) ≤ 5.75V,

10mA ≤ I_OUT≤ 5A

3V≤V_IN≤7V

10mA ≤ I_OUT≤ 5A

(V_OUT+ 1.5V) ≤ V_IN≤ 7V,

•

(+2%)

1.53

Output Voltage⁴

1.5

0.005

0.05

Line Regulation^1,2

Load Regulation^1,2,3

0.2

0.5

_OUT= 10mA

(V_IN- V_OUT) = 3V,

10mA ≤ I_OUT≤ 5A

∆V_REF= 1%, I_OUT= 5A

(V_IN- V_OUT) = 2V

Dropout Voltage

1.150 1.300

5.5

µA

•

Current Limit

5.1

Adjust Pin Current³

Adjust Pin Current Change³

120

0.2

1.5V ≤ (V_IN- V_OUT) ≤ 5.75V,

10mA ≤ I_OUT≤ 5A

Minimum Load Current

Quiescent Current

Ripple Rejection

1.5V ≤ (V_IN- V_OUT) ≤ 5.75V

V_IN= 5V

f = 120Hz, C_OUT= 22µF Tantalum,

(V_IN- V_OUT) = 3V, I_OUT= 5A

T_A= 25°C, 30ms pulse

•

Thermal Regulation

Temperature Stability

Long-Term Stability

RMS Output Noise

0.004

0.5

0.03

0.003

0.02

1.0

%/W

•

T_A= 125°C, 1000 hrs.

T_A= 25°C, 10Hz ≤ f ≤ 10kHz

(% of V_OUT

)

Thermal Resistance,

Junction to Case

Thermal Shutdown

Control Section

Power Transistor

0.7

3.0

°C/W

°C

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 current. Guaranteed maximum output power will not be available over the full input/output voltage range.

3. RC1585 only.

4. RC1585-1.5 only.

RC1585

SPECIFICATION

PRODUCT

Typical Performance Characteristics

0.10

0.05

1.5

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

0.5

∆I=5A

T=0°C

-0.05

-0.10

-0.15

-0.20

T=125°C

T=25°C

OUTPUT CURRENT (A)

-75 –50 –25 0 25 50 75 100 125 150 175

TEMPERATURE (°C)

Figure 2. Load Regulation vs. Temperature

Figure 1. Dropout Voltage vs. Output current

1.250

3.70

V_OUTSET WITH 1% RESISTORS

V_OUT= 3.6V¹

1.245

1.240

1.235

1.230

1.225

1.220

1.215

1.210

1.205

1.200

3.65

3.60

3.55

3.50

3.45

3.40

3.35

3.30

3.25

3.20

V_OUT= 3.45V¹

V_OUT= 3.38V¹

V_OUT= 3.3V¹

Note:

1. RC1585 Only

-75 -50 -25 0 25 50 75 100 125 150 175

TEMPERATURE (°C)

Figure 3. Reference Voltage vs. Temperature

Figure 4. Output Voltage vs. Temperature

100

Note:

1. RC1585 only

-75 -50 -25 0 25 50 75 100 125 150 175

TEMPERATURE (°C)

Figure 5. Minimum Load Current vs. Temperature

Figure 6. Adjust Pin Current vs. Temperature

Typical Performance Characteristics ^(continued)

PRODUCT SPECIFICATION

RC1585

(V_IN– V_OUT) ≤ 3V

0.5V ≤ V_RIPPLE≤ 2V

I_OUT= 5A

100

10K

100K

-75 -50 -25 0 25 50 75 100 125 150 175

TEMPERATURE (°C)

FREQUENCY (Hz)

Figure 8. Ripple Rejection vs. Frequency

Figure 7. Short-Circuit Current vs. Temperature

50 60 70 80 90 100 110 120 130 140 150

CASE TEMPERATURE

Figure 9. Maximum Power Dissipation

RC1585

SPECIFICATION

PRODUCT

Applications Information

The adjust pin can be driven on a transient basis ±7V

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.

General

The RC1585 and RC1585-1.5 are three-terminal regulators

optimized for GTL+ V_TTtermination and logic

applications. These devices are short-circuit protected, safe

area protected, and offer thermal shutdown to turn off the

regulator when the junction temperature exceeds about

150°C. The RC1585 series provides low dropout voltage

and fast transient response. Frequency 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+.

1N4002

(OPTIONAL)

RC1585

OUT

V_IN

V_OUT

ADJ

10µF

22µF

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 <1Ω. It is also recommended to

use bypass capacitors such as a 22µF tantalum or a 100µF

aluminum 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, smaller values of

output capacitors provide equally good results.

C_ADJ

1N4002

(OPTIONAL)

RC1585-1.5

V_IN

OUT

V_OUT

GND

10µF

22µF

Protection Diodes

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 conditions.

Figure 10. Optional Protection

Ripple Rejection

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

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

microsecond 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 recommended, as shown in Figure 10.

Usually, normal power supply cycling or system “hot

plugging and unplugging” will not generate current large

enough to do any damage.

_OUT/1.25V. The impedance of the adjust pin capacitor at

the ripple frequency 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.

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.

PRODUCT SPECIFICATION

RC1585

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 output voltage setting is

required.

The connection shown in Figure 13 does not

multiply R_Pby the divider ratio. As an example, R_P

is about four milliohms per foot with 16-gauge wire.

This translates to 4mV per foot at 1A load current.

At higher load currents, this drop represents 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.

RC1585

OUT

V_IN

V_OUT

ADJ

10µF

22µF

V_REF

I_ADJ

35µA

R_P

Parasitic

Line Resistance

V_OUT= V_REF(1 + R2/R1) + I_ADJ(R2)

Figure 11. Basic Regulator Circuit

RC1585

OUT

ADJ

V_IN

∫∫

R1*

R2*

Load Regulation

R_L

It is not possible to provide true remote load sensing

because the RC1585 series are three-terminal devices.

Load regulation 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.

*Connect R1 to case

Connect R2 to load

∫∫

Figure 13. Connection for Best Load Regulation

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.

Thermal Considerations

The RC1585 series protect themselves under overload

conditions with internal power and thermal limiting

circuitry. However, for normal continuous load

conditions, do not exceed maximum junction

temperature ratings. It is important to consider all

sources of thermal resistance from junction-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 temperature and ensure safe operating

temperatures. The electrical characteristics section

provides a separate thermal resistance and maximum

junction temperature for both the control circuitry and

the power transistor. Calculate the maximum junction

temperature for both sections to ensure that both

thermal limits are met.

R_P

Parasitic

Line Resistance

RC1585 -1.5

V_IN

OUT

GND

∫∫

R_L

∫∫

Figure 12. Connection for Best Load Regulation

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 regulation is obtained when the top of the

resistor divider R1 connects directly to the regulator

output and not to the load. Figure 13 illustrates this

point.

For example, look at using an RC1585T to generate

5A @ 1.5V ± 2% from a 3.3V source (3.2V to 3.6V).

If R1 connects to the load, then the effective resistance

between the regulator and the load would be:

R_P× (1 + R2/R1), R_P= Parasitic Line Resistance

RC1585

SPECIFICATION

Assumptions:

PRODUCT

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 electrically

isolated and include its contribution to the total

thermal resistance. The cases of the RC1585 series

are directly connected to the output of the device.

•

V_in= 3.6V worst case

V_OUT= 1.46V worst case

I_OUT= 5A continuous

T_A= 60°C

Θ_{Case-to-Ambient}= 5°C/W (assuming both a heatsink

and a thermally conductive material)

The power dissipation in this application is:

P_D= (V_IN- V_OUT) * (I_OUT) = (3.6-1.46) * (5) = 10.7W

From the specification table, for the power section:

T_J= T_A+ (P_D) * (Θ_{Case-to-Ambient}+ Θ_JC)

= 60 + (10.7) * (5 + 3) = 146°C

For the control section:

T_J= T_A+ (P_D) * (Θ_{Case-to-Ambient}+ Θ_JC) =

60 + (10.7) * (5 + 0.7) = 121°C

In each case, the junction temperature is below the

maximum rating.

RC1585

V_INV_OUT

V_OUT

1.5V

V_IN= 3.3V

124Ω

ADJ

10µF

100µF

24.9Ω

Figure 14. Application Circuit (RC1585)

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

Item

C2, C3

Quantity Manufacturer

Part Number

L10V10

L10V100

Description

10µF, 10V Aluminum

100µF, 10V Aluminum

124Ω, 1%

Xicon

Generic

Fairchild

24.9Ω, 1%

5A Regulator

RC1585T

PRODUCT SPECIFICATION

RC1585

RC1585-1.5

V_IN= 3.3V

V_OUT

1.5V

V_IN

V_OUT

GND

10µF

100µF

Figure 15. Application Circuit (RC1585-1.5)

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

Item Quantity Manufacturer

Part Number

L10V10

L10V100

Description

10µF, 10V Aluminum

100µF, 10V Aluminum

5A Regulator

Xicon

Fairchild

RC1585T-1.5

RC1585

SPECIFICATION

PRODUCT

Mechanical Dimensions

3-Lead TO-263 Package

Notes:

Symbol

Inches

Millimeters

Min. Max.

Min.

4.06

0.51

1.25

1.14

8.64

9.65

Max.

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. Dimension exclusive of dambar protrusion or

intrusion.

.160

.020

.049

.045

.340

.380

.190

.039

.051

.055

.380

.405

4.83

0.99

1.30

1.40

9.65

10.29

.100 BSC

2.54 BSC

5. Formed leads to be planar with respect to one

another at seating place –C-.

.575

.090

.017

0°

.625

.100

.055

.019

8°

14.61

2.29

0.43

0°

10.88

2.79

1.40

0.48

8°

@PKG/

@HEATSINK

E-PIN

R (2PLCS)

-B-

-A-

-C-

PRODUCT SPECIFICATION

RC1585

Mechanical Dimensions (continued)

3-Lead TO-220 Package

Symbol

Inches

Millimeters

Min. Max.

Min.

3.56

.38

1.14

.36

3.53

14.22

9.65

2.29

4.83

1.14

.51

5.94

2.04

12.70

Max.

.140

.015

.045

.014

.139

.560

.380

.090

.190

.045

.020

.230

.060

.500

.190

.040

.070

.022

.161

.650

.420

.110

.210

4.83

1.02

1.78

.56

4.09

16.51

10.67

2.79

5.33

.055

.270

.115

.580

1.40

6.87

2.92

14.73

Notes:

.250 BSC

6.35 BSC

1.00

1.35

2.54

3.43

1. Dimension c1 apply for lead finish.

3°

7°

3°

7°

E-PIN

α (5X)

RC1585

SPECIFICATION

PRODUCT

Ordering Information

Product Number

RC1585M

RC1585T

RC1585M-1.5

RC1585T-1.5

Package

TO-263

TO-220

TO-263

TO-220

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:

2. A critical component in 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.

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, and (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 a significant injury of the user.

Fairchild Semiconductor

Corporation

Americas

Customer Response Center

Tel:1-888-522-5372

Fairchild Semiconductor

Europe

Fax: +49 (0) 1 80-530 85 86

Email: europe.support@nec.com

Deutsch Tel: +49 (0) 8 141-35-0

Fairchild Semiconductor

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Tel:81-3-5620-6175

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Tel: +39 (0) 2 57 5631

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RC1585M15 [FAIRCHILD]

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