TCL1585-3.3CAB_技术文档

7A / 5A / 4.6A / 3A, FAST RESPONSE,

LOW DROPOUT POSITIVE LINEAR

VOLTAGE REGULATORS

PRELIMINARY INFORMATION

TCL1584

TCL1585

TCL1587

7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT

POSITIVE LINEAR VOLTAGE REGULATORS

FEATURES

The TCL1584/1585/1587 are low dropout, positive lin-

ear voltage regulators. They have a maximum current

output specification of 7A, 5A, 4.6A and 3A respectively.

All three devices are supplied in fixed and adjustable output

voltage versions.

Good transient load response combined with low drop-

out voltage makes these devices ideal for the latest low

voltage microprocessor power supplies. Additionally, short-

circuit, thermal and safe operating area (SOA) protection is

provided internally to ensure reliable operation.

The TCL1587, TCL1585 and TCL1584 are available in

a3-pinTO-220tabbedpowerpackageandina3-pinsurface

mount DDPAK-3 package.

■ Fixed and Adjustable Voltages ........1.5V and 3.3V

■ Optimized for Low Voltage Applications

■ Output Current Capability..........7A / 5A / 4.6A / 3A

■ Guaranteed Dropout Voltage up to Full Rated

Output

■ Integrated Thermal and Short-Circuit Protection

■ Compact 3-Pin Surface-Mount and Thru-Hole

Standard Power Packages

■

V_REFAccuracy................................................. 2.0%

■ Load Regulation ............................................. 0.05%

APPLICATIONS

■ Pentium^TM*, PentiumPro^TM*CPU Power Supplies

■ PowerPC^TM*CPU Power Supplies

ORDERING INFORMATION

■ PentiumPro^TM*System GTL+ Bus Terminators

■ Low-Voltage, High Speed Microprocessors

■ Post-Regulator for Switch-Mode Power Supplies

Part Number

Package

Temp. Range

TCL1584-3.3CAB

TCL1584-3.3CEB

TCL1584-ADJCAB

TCL1584-ADJCEB

TO-220-3

DDPAK-3

TO-220-3

DDPAK-3

0°C to + 70°C

GENERAL DESCRIPTION

PIN CONFIGURATIONS

TCL1585-1.5CAB

TCL1585-1.5CEB

TCL1585-3.3CAB

TCL1585-3.3CEB

TCL1585-ADJCAB

TCL1585-ADJCEB

TO-220-3

DDPAK-3

TO-220-3

DDPAK-3

TO-220-3

DDPAK-3

0°C to + 70°C

TO-220-3

DDPAK-3

3

1

2

3

1

2

TCL1587-1.5CAB

TCL1587-1.5CEB

TCL1587-3.3CAB

TCL1587-3.3CEB

TCL1587-ADJCAB

TCL1587-ADJCEB

TO-220-3

DDPAK-3

TO-220-3

DDPAK-3

TO-220-3

DDPAK-3

0°C to + 70°C

TCL1584CAB

TCL1585CAB

TCL1587CAB

TCL1584CEB

TCL1585CEB

TCL1587CEB

NOTE: For TO-220 Θ_JA= 53°C/W. For DDPAK-3 Θ_JA= 76°C/W. Θ_JAfor both packages

are specified without external heat sinks. See Applications Section for details.

TYPICAL OPERATING CIRCUIT

Adjustable Output Voltage Version

V

Fixed Output Voltage Version

V

=

OUT

(1+ R1/R2)V

REF

V

= 5V

V

= 3.3V

OUT

V

IN

OUT

IN

V

= 5V

OUT

IN

C2*

(Tantalum)

TCL158x

ADJ

TCL158x-3.3

GND

C1 = 10µF

C2*

(Tantalum)

R1

R2

*NOTE: C2 is required to ensure output stability. Minimum 22µF (TCL1584) or 10µF (TCL1585/7),

low ESR tantalum type. Larger values may be required for high output current transient

regulation. See Applications section.

*All Trademarks and Trade Names are the property of their respective owners.

1

TCL1584/1585/1587-04 6/6/97

TCL1584/1585/1587-04 6/6/97 TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices.

PRELIMINARY INFORMATION

7A / 5A / 4.6A / 3A, FAST RESPONSE,

LOW DROPOUT POSITIVE LINEAR

VOLTAGE REGULATORS

TCL1584

TCL1585

TCL1587

*This is a stress rating only, and functional operation of the device at these

or any other conditions beyond those indicated in the operation section of

the specifications is not implied. Exposure to absolute maximum ratings

conditions for extended periods of time may affect device reliability.

ABSOLUTE MAXIMUM RATINGS*

Input Voltage (V_INto GND) ...........................................7V

Operating Junction Temperature Range

Control Circuitry ................................... 0°C to +125°C

Output Transistor .................................0°C to +150°C

Power Dissipation ..................... See Applications Section

Storage Temperature (unbiased) .......... – 65°C to +150°C

Lead Temperature (Soldering, 10 sec) ................. +300°C

ELECTRICAL CHARACTERISTICS: T_A= Operating Temperature Range, 4.75V ≤ V_IN≤ 5.25V, unless

otherwise specified.

Parameter Device

Test Conditions

Min

Typ

Max

Unit

Reference TCL1584

1.5V ≤ (V_IN– V_OUT) ≤ 3V, 10mA ≤ I_OUT≤ 7A

1.225

1.25

1.275

V

Voltage

TCL1585

1.5V ≤ (V_IN– V_OUT) ≤ 5.75V, 10mA ≤ I_OUT≤ 4.6A, T_J≥ 25°C

1.5V ≤ (V_IN– V_OUT) ≤ 5.75V, 10mA ≤ I_OUT≤ 4A, T_J< 25°C

1.5V ≤ (V_IN– V_OUT) ≤ 5.75V, 10mA ≤ I_OUT≤ 3A

TCL1587

Output

TCL1587-1.5

4.75V ≤ V_IN≤ 7V, 0mA ≤ I_OUT≤ 3A

Voltage

TCL1584-3.3

TCL1585-3.3

4.75V ≤ V_IN≤ 6.3V, 0mA ≤ I_OUT≤ 7A

3.235

3.30

3.365

V

4.75V ≤ V_IN≤ 7V, 0mA ≤ I_OUT≤ 4.6A, T_J≥ 25°C

4.75V ≤ V_IN≤ 7V, 0mA ≤ I_OUT≤ 4A, T_J< 25°C

4.75V ≤ V_IN≤ 7V, 0mA ≤ I_OUT≤ 3A

TCL1587-3.3

TCL1584/5/7

Line

2.75V ≤ V_IN≤ 7V, I_OUT= 10mA

4.75V ≤ V_IN≤ 7V, I_OUT= 0mA

—

0.005

0.05

0.2

0.3

%

Regulation TCL1587-1.5

(Notes 1, 2) TCL1584/5/7-3.3 4.75V ≤ V_IN≤ 7V, I_OUT= 0mA

Load TCL1584/5/7 (V_IN– V_OUT) = 3V, T_J= 25°C, 10mA ≤ I_OUT≤ I_{FULL LOAD}

Regulation TCL1587-1.5

(Notes 1, TCL1584/5/7-3.3 V_IN= 5V, T_J= 25

V_IN= 5V, T_J= 25

°

C, 0mA ≤ I_OUT≤ I_{FULL LOAD}

°

2, 3)

Over Operating Temperature Range

—

0.05

1.15

0.5

Dropout

Voltage

TCL1585/7

TCL1587-1.5

TCL1585/7-3.3

∆V_REF= 1%, I_OUT= 3A

∆V_OUT= 1%, I_OUT= 3A

1.30

V

TCL1585

∆V_REF= 1%, I_OUT= 4.6A, T_J≥ 25°C

∆V_REF= 1%, I_OUT= 4A, T_J< 25°C

∆V_OUT= 1%, I_OUT= 4.6A, T_J≥ 25°C

∆V_OUT= 1%, I_OUT= 4A, T_J< 25°C

—

1.20

1.40

TCL1585-3.3

TCL1584

TCL1584-3.3

∆V_REF= 1%, I_OUT= 6A

∆V_OUT= 1%, I_OUT= 6A:T_J≥ 25°C

T_J< 25°C

—

1.20

1.30

1.35

V

|

TCL1584

TCL1584-3.3

∆V_REF= 1%, I_OUT= 7A

∆V_OUT= 1%, I_OUT= 7A

—

1.25

1.40

Current

Limit

TCL1584

TCL1584-3.3

(V_IN– V_OUT) = 3V

7.10

8.25

—

A

(Note 3)

TCL1585

TCL1585-3.3

(V_IN– V_OUT) = 5.5V: T_J< 25°C

(V_IN– V_OUT) = 5.5V: T_J≥ 25°C

4.10

4.60

5.25

—

A

TCL1587

TCL1587-1.5

TCL1587-3.3

(V_IN– V_OUT) = 5.5V

3.10

3.75

—

Temperature TBD

Coefficient

TBD

ADJ Pin

Current

TCL1584/5/7

—

55

120

µA

2

TCL1584/1585/1587-04 6/6/97

7A / 5A / 4.6A / 3A, FAST RESPONSE,

LOW DROPOUT POSITIVE LINEAR

VOLTAGE REGULATORS

PRELIMINARY INFORMATION

TCL1584

TCL1585

TCL1587

ELECTRICAL CHARACTERISTICS: (Cont.) T_A= Operating Temperature Range, 4.75V ≤ V_IN≤ 5.25V,

unless otherwise specified.

Parameter Device

Test Conditions

Min

Typ

Max

Unit

ADJ Pin

Current

Change

(Note 3)

TCL1584

TCL1585/7

1.5V ≤ (V_IN– V_OUT) ≤ 3V, 10mA ≤ I_OUT≤ I_{FULL LOAD}

1.5V ≤ (V_IN– V_OUT) ≤ 5.75V, 10mA ≤ I_OUT≤ I_{FULL LOAD}

—

0.2

5

µA

Minimum TCL1584/5/7

1.5V ≤ (V_IN–V_OUT) ≤ 5.75V

—

2

10

mA

Load

Current

Quiescent TCL1587-1.5

V_IN= 5V

—

8

13

—

mA

dB

Current

TCL1584/5/7-3.3 V_IN= 5V

Ripple

TCL1584

f = 120Hz, C_OUT= 25µF Tant. (V_IN– V_OUT) = 2.5V, I_OUT= 7A

f = 120Hz, C_OUT= 25µF Tant., V_IN= 5.8V, I_OUT= 7A

f = 120Hz, C_OUT= 25µF Tant., (V_IN– V_OUT) = 3V, I_OUT= 4.6A, T_J≥ 25°C

60

72

Rejection TCL1584-3.3

TCL1585

f = 120Hz, C_OUT= 25µF Tant., (V_IN– V_OUT) = 3V, I_OUT= 4A, T_J

≤ 25°C

TCL1585-3.3

f = 120Hz, C_OUT= 25µF Tant.,V_IN= 6.3V, I_OUT= 4.6A, T_J≥ 25°C

f = 120Hz, C_OUT= 25µF Tant.,V_IN= 6.3V, I_OUT= 4.6A, T_J≤ 25°C

f = 120Hz, C_OUT= 25µF Tant., (V_IN– V_OUT) = 3V, I_OUT= 3A

f = 120Hz, C_OUT= 25µF Tant., V_IN= 5.0V, I_OUT= 3A

TCL1587

TCL1587-1.5

TCL1587-3.3

f = 120Hz, C_OUT= 25µF Tant., V_IN= 6.3V, I_OUT= 3A

Thermal

Regulation TCL1587-1.5

TCL1584/5/7

T_A= 25°C, 30msec Pulse

—

0.004

0.02

%/W

TCL1584/5/7-3.3 T_A= 25°C, 30msec Pulse

Temperature

Stability

V_IN= 5V, I_OUT= 0.5A

—

0.5

—

1.0

—

%

Long Term

Stability

T_A= 125°C, 1000Hrs.

T_A= 25°C, 10Hz ≤ f ≤ 10kHz

0.03

0.003

RMS

Output

Noise (%

of V_OUT

)

Thermal

Resistance TCL1585

(Junction to TCL1585

TCL1584

“A” pkg. (TO-220): Control Circuitry/Power Transistor

“E” pkg. (TO-263): Control Circuitry/Power Transistor

“A” pkg. (TO-220): Control Circuitry/Power Transistor

“E” pkg. (TO-263): Control Circuitry/Power Transistor

—

0.65/2.7 °C/W

0.7/3.0 °C/W

Case, Θ_JA

)

TCL1587

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. Load and line regulation are guaranteed up to the maximum power dissipation (25W for the TCL1584 in “A” pkg., 26.5W for the TCL1585 in

“A” pkg., 18W for the TCL1587 in “A” pkg.). Power dissipation is determined by input/output voltage differential and output current. Guaranteed

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

3. I_{FULL LOAD}is defined as the maximum value of output load current as a function of input-to-output voltage. I_{FULL LOAD}is a nominal 7A for

TCL1584, decreasing to approximately 3A as V_IN– V_OUTincreases from 3V to 7V. For all other fixed voltage TCL1585’s, I_{FULL LOAD}is 4A. For

the TCL1587, I_{FULL LOAD}is 3A. The TCL1585 and 1587 have constant current limit with respect to V_INand V_OUT

.

3

TCL1584/1585/1587-04 6/6/97

PRELIMINARY INFORMATION

7A / 5A / 4.6A / 3A, FAST RESPONSE,

LOW DROPOUT POSITIVE LINEAR

VOLTAGE REGULATORS

TCL1584

TCL1585

TCL1587

Typical Dropout Voltage vs. Output Current

1.5

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

0.5

0

I

FULL LOAD

OUTPUT CURRENT (A)

SIMPLIFIED SCHEMATIC

V

IN

+

–

TCL1584/5/7

V

OUT

THERMAL

LIMIT

ADJ

GND

FOR FIXED VOLTAGE DEVICE

4

TCL1584/1585/1587-04 6/6/97

7A / 5A / 4.6A / 3A, FAST RESPONSE,

LOW DROPOUT POSITIVE LINEAR

VOLTAGE REGULATORS

PRELIMINARY INFORMATION

TCL1584

TCL1585

TCL1587

APPLICATIONS

General

age response to step load current change is illustrated in

Figure 1. The capacitor’s ESR and ESL cause immediate

step changes in the output voltage. These are calculated as

follows:

The TCL158x family of devices combine high current

output (up to 7A) with low dropout voltage and built-in fault

protection in a traditional three-terminal LDO format. All

three device types are available in fixed output voltage and

adjustable output versions. Fault protection includes short-

circuit current limit, over-temperature limit, and safe-operat-

ing-area (SOA) governing.

These devices are pin-compatible upgrades for the

1083/1084/1085 family of LDO’s. However, the TCL158x

family delivers lower dropout voltage, faster load transient

response and improved internal frequency compensation.

Maximum supply voltage rating is 7.0V.

Modern processors cycle load current from near zero to

several amps in a time period measured in tens of nanosec-

onds. Load step response requirements are worsened by

tighter output voltage tolerances. The TCL1584/85/87 fam-

ily of regulators meets these stringent requirements without

an obnoxious amount of output capacitance, saving both

board space and cost.

∆V_ESR= ∆I x ESR

DV_ESL= DI/Dt x ESL

To reduce the initial voltage droop, one should select

lowESRandESLcapacitors. Itshouldalsobenotedthatthe

ESR effect is multiplied by absolute change in load current

whiletheESLeffectismultipliedbytherateofchangeinload

current. After the initial voltage drop, the capacitor value

dominates the rate of change in voltage. This rate is calcu-

lated as follows:

∆V = ∆t x ∆I/C

ESR

EFFECTS

Stability and Transient Response

ESL

EFFECTS

CAPACITANCE

EFFECTS

Like most low dropout voltage regulators, the TCL158x

devices require the use of output capacitors to maintain

stability. Normally a 22µF solid tantalum or a 100µF alumi-

num electrolytic unit will ensure stability over all operating

conditions. Keep in mind that commercially available ca-

pacitors can have significant non-ideal effects such as

capacitance value tolerance, temperature coefficient, ESR,

ESL. The TCL158x devices are optimized for use with low

ESR (<1Ω) capacitors.

On the adjustable voltage versions, bypassing the ADJ

pin will improve ripple rejection and transient response. This

is discussed in the Ripple Rejection section. This bypassing

increases the required output capacitance value. The previ-

ously suggested minimum values (22µF and 100µF) take

this into account. If no bypassing is used, lower values of

output capacitance may be used.

V = ∆I

SLOPE,

t

C

POINT AT WHICH REGULATOR

TAKES CONTROL

Figure 1. Transient Load Voltage Response

Typically high quality ceramic and tantalum capacitors

mustbeusedincombinationtominimizeESRandmaximize

C. This decoupling network must also be placed close to the

microprocessor to reduce ESL (parasitic board trace induc-

tance). If possible, the capacitors should be placed inside

the microprocessor socket cavity. Of course, robust power

and ground planes will also improve performance by reduc-

ing parasitic voltage drops.

The TCL1584 has an adaptive current limiting scheme

where to ensure SOA for the output transistor, the current

limitisreducedforincreasinginputtooutputdifferential.This

means that the TCL1584 exhibits a negative resistance

characteristic under certain conditions. This is a common

technique in LDO design to ensure SOA - especially LDO’s

with high maximum input voltage ratings. This negative

resistance can interact with the external capacitance and

inductance and cause oscillations during current limit. This

effect is highly dependent on system parameters and is

difficult to predict. However this oscillation, if it occurs, will

not damage the regulator and can be ignored if the system

Transient regulation is directly related to output capaci-

tance value. For applications which require large load cur-

rent step changes, it is recommended that large output

capacitors (>100µF) be used. The value of the output

capacitor can be increased without limit and will only im-

prove transient regulation.

In a typical high-performance microprocessor applica-

tion, the sudden transients can be so fast that the output

decoupling network must handle the sudden current de-

mand until the internal voltage regulator is able to respond.

In this case the non-ideal effects of the output capacitor are

critical in determining the regulator’s response. Output volt-

TCL1584/1585/1587-04 6/6/97

5

PRELIMINARY INFORMATION

7A / 5A / 4.6A / 3A, FAST RESPONSE,

LOW DROPOUT POSITIVE LINEAR

VOLTAGE REGULATORS

TCL1584

TCL1585

TCL1587

Overload Recovery

parameters will allow it. Typically, increasing the output

capacitance helps reduce the oscillation. NOTE: The

TCL1585 and TCL1584 have fixed current limit over the

entire voltage range and are not susceptible to this phenom-

enon.

Thebuilt-inShortCircuitandSafe-Operating-Area(SOA)

protection function of the TCL158x family can cause sec-

ondary effects which must be considered for robust system

design. The behavior of the regulator under heavy loads

(short circuit) at start-up is such that the output voltage will

remain low while sourcing maximum current until the load is

removedorreduced.Normally,theoutputvoltagewillriseas

the load is reduced and trace a line I-V relationship accord-

ing to the SOA limit. If the load line intersects this output

curve at two points the output voltage may not recover from

the heavy load/short-circuit condition. This condition is illus-

trated in Figure 3. The current limit constraint does not allow

anyloadpointaboveitandtheloadlineisdefinedabsolutely

by the I-V characteristics of the load (a resistor, in this case).

Under these conditions it may be necessary to cycle the

power supply off and then on again. This phenomenon is

common for LDO’s with fold-back current limiting schemes.

NOTE: Overload recovery is always guaranteed on the

TCL1585 and TCL1587 because of the constant current

limit characteristic.

Protection Diodes

The TCL158x family of devices do not normally require

any external current limiting circuitry such as protection

diodes, frequently used with older LDO regulators. A diode

is internally present between the output and input which is

capable of handling short-duration surge currents of up to

100A. This capability typically ensures safe operation ex-

cept for the case where output capacitance is exceedingly

large(>1000µF)andtheinputissuddenlyshortedtoground.

This situation can produce excessive reverse current in the

device - enough to cause damage. An external high current

diode should be used as shown in Figure 2.

The ADJ pin does not normally need protection diodes

either. It can handle ±7V without any performance degrada-

tion or device damage. Current at this pin is internally limited

by a series resistor so the bypass capacitors do not present

any danger. Of course, exceeding 7V differential between

any two pins will cause catastrophic junction breakdowns

and possible damage to the device.

Ripple Rejection

A typical ripple rejection curve for the fixed output

voltage devices is shown in Figure 3. It is possible to obtain

improved performance in ripple rejection by using the ad-

justable output TCL158x with a bypass capacitor (C_ADJ

)

D1

1N4002

(OPTIONAL)

shown in Figure 2. This capacitor should be chosen to have

a value such that its impedance at the ripple frequency is

less than R1 (see Figure 2.). Usually this is on the order of

100Ω. Example: If R1 = 100Ω and f_RIPPLE= 120Hz, the

bypass capacitor should be chosen to be 22µF or greater. If

theseconditionsaremettheripplerejectionwillbeimproved

by a factor of V_OUT/1.25 when compared to the performance

of the fixed output devices.

V

IN

V

OUT

TCL1584-3.3

GND

OUT

+

C2

22µF

C1

10µF

D1

1N4002

(OPTIONAL)

Current Limit Curve

V

IN

V

OUT

TCL1584

ADJ

OUT

Unrecoverable

I

OUT

I-V Point

+

C2

R1

+

C1

10µF

22µF

Start Up

Point

Load Line

+

R2

C

ADJ

V

– V

(Constant V )

OUT IN

IN

Figure 2. Protection Diodes and C_ADJ

Figure 3. Overload Recovery

6

TCL1584/1585/1587-04 6/6/97

7A / 5A / 4.6A / 3A, FAST RESPONSE,

LOW DROPOUT POSITIVE LINEAR

VOLTAGE REGULATORS

PRELIMINARY INFORMATION

TCL1584

TCL1585

TCL1587

Output Voltage

R

P

PARASITIC

LINE RESISTANCE

The output voltage for the fixed output versions of the

TCL158x is set internally and cannot be adjusted. For the

adjustable output versions, the output voltage is set by two

external resistors: R1 and R2 (see Figure 3). A 1.25V

reference voltage is maintained between the OUTPUT pin

and the ADJ pin. NOTE: the ADJ pin typically will source

55µA. R1 should be chosen to conduct at least the specified

minimum load current of 10mA (i.e. at most 125Ω). Now R2

will determine the total output voltage according to the

equation below:

V

IN

OUT

TCL1584-3.3

GND

R

L

Figure 5. Connection for Best Load Regulation

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

)

In both cases, because the effect of parasitic trace

The contribution due to the I_ADJterm is relatively small

as I_ADJis only 55µA compared to 10mA for the total current

in the adjust circuit.

resistance (R_P) cannot be completely eliminated, it is impor-

tant to keep the positive output lead as short as possible.

Otherwise, at high output currents, the load regulation will

degrade appreciably. Example:

R_P= 5mΩ

I_OUT= 3A

V_DROP= (0.005) x (3) = 15mV

V

IN

OUT

IN

OUT

TCL1584

ADJ

+

C1

10µF

C2

22µF

V

REF

R1

R2

I

ADJ

55µA

R

P

PARASITIC

R2

R1

V

= V

REF

1+

+ I

(R2)

ADJ

OUT

(

)

LINE RESISTANCE

V

IN

OUT

TCL1584

ADJ

Figure 4. Adjustable Voltage Regulator

R1*

R2*

Load Regulation

R

L

Because the TCL158x family are three terminal de-

vices, it is not possible to perform true Kelvin load voltage

sensing. Therefore load regulation is limited somewhat by

parasitictraceresistance.Theloadregulationspecifications

aremeasureddirectlyattheTCL158xpackage.Tominimize

degradation in load regulation performance the following

guidelines should be used.

*CONNECT R1 TO CASE

CONNECT R2 TO LOAD

For fixed voltage devices, the GND pin should be

connected directly to the negative side of the load instead of

to a common ground bus. This provides Kelvin sensing at

the negative side while the positive side is still limited by R_P

(See Figure 5).

Figure 6. Connection for Best Load Regulation

Thermal Considerations

For adjustable output devices, the bottom of R2 con-

nects to the negative side of the load. For the positive side,

best regulation is obtained when the top of R1 is connected

directly to the TCL158x and not to the load (See Figure 6).

If R1 connects to the load the effective resistance between

the output and the load is:

The TCL158x family includes built-in thermal overload

protection. However, maximumoperatingjunctiontempera-

ture must not be exceeded for any condition. Since these

devices are capable of dissipating up to 25W or more under

some conditions, careful thermal design is required for

reliable, continuous operation. In most cases, external heat

sinking will be required.

R_Px (1 + R2/R1)

TCL1584/1585/1587-04 6/6/97

7

PRELIMINARY INFORMATION

7A / 5A / 4.6A / 3A, FAST RESPONSE,

LOW DROPOUT POSITIVE LINEAR

VOLTAGE REGULATORS

TCL1584

TCL1585

TCL1587

When generating the overall thermal design, it is impor-

tant to consider all sources of thermal resistance between

thesilicondieandambient-junction-to-case(Θ_JC), case-to-

heat sink (Θ_CH), heat sink-to-ambient (Θ_HA). NOTE: there

are two separate Θ_JCspecifications for the power transistor

andthecontrolcircuitry.Bothjunctiontemperaturesmustbe

calculated and kept under each respective maximum limit to

ensure proper operation. This Θ_JCis for the physical path

between the die and the bottom metal portion of the case

(both TO-220 and DDPAK-3. Heat flow will be greatest

through this path. It is important that good thermal coupling

is made between the case and heat sink. If electrical

isolation from the heat sink is not required, it is recom-

mended that thermally conductive compound be used.

Otherwise, use a thermally conductive dielectric spacer.

The following is a thermal design example:

NOTE: Without heat sinking, the thermal resistance for the

TO-220 and DDPAK-3 packages are 53°C/W and

76°C/W respectively.

Using a TCL1585-3.3 in a TO-220 package:

Assumptions:

T_A= +70°C

V_IN= 5.25V (5V + 5%)

V_OUT= 3.30V

I_OUT= 4.6A

Θ_HA= 3.5°C/W (heat sink-to-ambient)

Θ_CH= 1.5°C/W (case-to-heat sink)

Θ_JC= 3°C/W (power transistor)

Θ_JC= 0.7°C/W (control circuitry)

Power dissipation:

P_D= (V_IN– V_OUT)(I_OUT) = (5.25 – 3.3)(4.6) = 8.97W

Junction Temperatures:

T_J= T_A+ P_D(Θ_HA+ Θ_CH+ Θ_JC)

Control Circuitry:

T_J= 70 + 8.97(3.5 + 1.5 + 0.7) = 121.1°C

Power Transistor:

T_J= 70 + 8.97(3.5 + 1.5 + 3) = 141.8°C

These values for T_Jfall within the maximum allowed

junction temperature for each die section indicating ad-

equate heat sinking with some margin.

8

TCL1584/1585/1587-04 6/6/97

7A / 5A / 4.6A / 3A, FAST RESPONSE,

LOW DROPOUT POSITIVE LINEAR

VOLTAGE REGULATORS

PRELIMINARY INFORMATION

TCL1584

TCL1585

TCL1587

TYPICAL APPLICATIONS

Typical Intel™* 486Dx4 Microprocessor Application

PLACE AT MICROPROCESSOR SOCKET V

CC

PINS

3.30V

3A

V_IN

V_OUT

TCL1587-3.3

V

_IN≥ 4.75V

C2

22µF

10V

C3 TO C6

47µF

C7 TO C15

0.1µF

C16 TO C24

C1

10µF

10V

GND

0.01µF

10V

ESR OF THE 47µF IS < 0.1Ω

Intel™* 90MHz Pentium™* Power Supply

THERMALLOY

PLACE IN MICROPROCESSOR

7020B-MT

SOCKET CAVITY

3.38V

4.6A

V_OUT

V_IN

4.75V TO 5.25V

C1 TO C3

TCL1585

ADJ

R1

110Ω

0.1%

C5 TO C10

100µF

10V

C11 TO C20

1µF

16V

220µF

10V

AVX TPS

3 EACH

AVX TPS

6 EACH

AVX Y5V 0805

10 EACH

R2

187Ω

0.1%

C4

330µF

16V

AVX X7R 0805

AVX Corp. (803) 448-9411

Sanyo Video Components (USA) Corp. (619) 661-6322

Thermalloy Inc. (214) 243-4321

DO NOT SUBSTITUTE COMPONENTS

Transient Response for 3.8A Load Current Step*

V

OUT

50mV/DIV

I

OUT

2A/DIV

100µsec/DIV

*TRANSIENT RESPONSE MEASURED WITH AN

INTEL POWER VALIDATOR™. V

AT THE POWER VALIDATOR.

IS MEASURED

OUT

All Trademarks and Trade Names are the property of their respective owners.

9

TCL1584/1585/1587-04 6/6/97

PRELIMINARY INFORMATION

7A / 5A / 4.6A / 3A, FAST RESPONSE,

LOW DROPOUT POSITIVE LINEAR

VOLTAGE REGULATORS

TCL1584

TCL1585

TCL1587

TYPICAL APPLICATIONS (Cont.)

+

Typical Intel™* Pentium™* Pro GTL Bus Terminator Application Using TCL1587-1.5

V_OUT= 1.5V @ 3A

V_OUT

TCL1587-1.5

GND

V_IN

V

_IN= 5V or 3.3V

R_TERM

C3 =1µF x 5

(Ceramic)

C2 = 10µF

(Tantalum)

R_REF

C1 = 10µF

= 100Ω x 71

Lines

+

GTL Bus (Z_O)

V

_REF= 1.0V

R_TERM

2R_REF

= 100Ω x 71

V

_OUT= 1.5V @ 3A

Lines

V_OUT

TCL1587-1.5

V_IN

V

_IN= 5V or 3.3V

C1 = 10µF

C2 = 10µF

(Tantalum)

C3 = 1µF x 5

(Ceramic)

GND

+

NOTES: 1. It is recommended that the GTL bus be terminated at each end by a separate regulator to avoid power distribution losses.

+

2. The GTL bus transmission line symbol will consist of all the components (chip set IC's) on the GTL bus.

3. R_REFand 2R_REFshould be chosen such that V_REFloading does not appreciably degrade V_REFregulation.

Values <100 ohms should suffice for most applications.

4. R_TERMwill be determined by individual bus physical/electrical parameters. See CPU manufacturer documentation for

application information.

*All Trademarks and Trade Names are the property of their respective owners.

10

TCL1584/1585/1587-04 6/6/97

7A / 5A / 4.6A / 3A, FAST RESPONSE,

LOW DROPOUT POSITIVE LINEAR

VOLTAGE REGULATORS

PRELIMINARY INFORMATION

TCL1584

TCL1585

TCL1587

TYPICAL CHARACTERISTICS

TCL1584 Short Circuit Current

vs. Input/Output Differential

TCL1584 Load Regulation

vs. Temperature

TCL1584 Dropout Voltage vs.

Output Current

10

0.10

1.5

1.4

1.3

∆I = 7A

0.05

0

8

T = – 5°C

1.2

1.1

1.0

0.9

0.8

6

4

T = 125°C

T = 25°C

–0.05

T = 125°C

T = 25°C

T = – 5°C

–0.10

–0.15

–0.20

MINIMUM

2

0

0.7

0.6

0.5

INDICATES GUARANTEED TEST POINT

0

1

2

3

4

5

6

7

0

1

2

3

4

5

6

7

125

25 50 75100 150 175

–75 –50 –25

0

TEMPERATURE (°C)

OUTPUT CURRENT (A)

INPUT/OUTPUT DIFFERENTIAL (V)

TCL1585 Load Regulation

vs. Temperature

TCL1585 Dropout Voltage vs.

Output Current

TCL1585 Short-Circuit Current

vs. Temperature

6.0

1.5

0.10

∆I = 4.6A

1.4

1.3

1.2

1.1

1.0

0.05

0

T = – 5°C

5.5

5.0

–0.05

–0.10

T = 125°C

0.9

0.8

T = 25°C

4.5

4.0

0.7

0.6

0.5

–0.15

–0.20

INDICATES GUARANTEED TEST POINT

0

1

2

3

4

5

–75 –50 –25 0 25 50 75 100 125150 175

OUTPUT CURRENT (A)

TEMPERATURE (°C)

TCL1587 Dropout Voltage vs.

Output Current

TCL1587 Short-Circuit Current

vs. Temperature

TCL1587 Load Regulation

vs. Temperature

1.5

1.4

1.3

5.0

0.10

∆I = 3A

0.05

0

4.5

4.0

T = – 5°C

1.2

1.1

1.0

–0.05

–0.10

T = 25°C

0.9

0.8

T = 125°C

3.5

3.0

0.7

0.6

0.5

–0.15

–0.20

INDICATES GUARANTEED TEST POINT

0

–75 –50 –25 0 25 50 75100 125150 175

1.0

1.5

3.0

0.5

2.0 2.5

–75 –50 –25

0 25 50 75100 125 150 175

OUTPUT CURRENT (A)

TEMPERATURE (°C)

11

TCL1584/1585/1587-04 6/6/97

PRELIMINARY INFORMATION

7A / 5A / 4.6A / 3A, FAST RESPONSE,

LOW DROPOUT POSITIVE LINEAR

VOLTAGE REGULATORS

TCL1584

TCL1585

TCL1587

TYPICAL CHARACTERISTICS (Cont.)

TCL1584/5/7 Reference Voltage

vs. Temperature

Output Voltage vs Temperature

Using Adjustable TCL1584/5/7

TCL1584/5/7-3.3 Output Voltage

vs.Temperature

1.275

3.70

3.65

3.60

3.55

V

SET WITH 1% RESISTORS

OUT

3.65

1.270

1.265

1.260

1.255

1.250

1.245

1.240

V

= 3.6V

OUT

3.60

3.55

3.50

3.45

3.40

3.35

3.30

3.50

3.45

3.40

3.35

V

= 3.45V

= 3.38V

OUT

V

OUT

V

= 3.3V

V

= 3.3V

OUT

3.30

3.25

1.235

3.25

3.20

1.230

1.255

3.20

–75 –50 –25

0

25 50 75 100 125 150 175

–75 –50 –25

0

25 50 75 100 125 150 175

–75 –50 –25

0 25 50 75100 125 150 175

TEMPERATURE (°C)

TCL1584/5/7 Minimum Load Current

vs. Temperature

TCL1584/5/7 Adjust Pin Current

vs. Temperature

TCL1584/5/7-3.xx Quiescent

Current vs. Temperature

5

13

12

11

10

100

90

80

70

60

50

40

4

3

2

9

8

7

6

30

20

10

0

1

0

5

4

3

–75 –50 –25

0 25 50 75100 125 150 175

–75 –50 –25

0

25 50 75 100 125 150 175

–75 –50 –25

0 25 50 75 100 125 150 175

TEMPERATURE (°C)

TCL1584/5/7 Ripple Rejection

vs. Frequency

TCL1585/7 Maximum Power

Dissipation*

TCL1584 Maximum Power

Dissipation*

90

30

25

20

15

10

TCL1585

TCL1584

80

70

25

20

15

10

TCL1587

60

50

40

30

20

TCL1584: (V – V

IN OUT

) ≤ 2.5V

) ≤ 3V

TCL1584/87 (V – V

IN

OUT

5

0

5

0

0.5V ≤ V

≤ 2V

= I

FULL LOAD

RIPPLE

10

0

I

OUT

60

10

100

1k

100k

10k

50 60 70 80 90 100 110 120 130 140 150

50

70 80 90 100

120 130 140 150

110

CASE TEMPERATURE (°C)

FREQUENCY (Hz)

*AS LIMITED BY MAXIMUM JUNCTION

TEMPERATURE

*AS LIMITED BY MAXIMUM JUNCTION

TEMPERATURE

12

TCL1584/1585/1587-04 6/6/97

7A / 5A / 4.6A / 3A, FAST RESPONSE,

LOW DROPOUT POSITIVE LINEAR

VOLTAGE REGULATORS

PRELIMINARY INFORMATION

TCL1584

TCL1585

TCL1587

PACKAGE DIMENSIONS

DDPAK-3

.183 (4.65)

.170 (4.32)

.410 (10.41)

.385 (9.78)

.067 (1.70)

.045 (1.14)

.055 (1.40)

.045 (1.14)

3° - 7°

(5x)

.370 (9.40)

.329 (8.38)

.010 (0.25)

.000 (0.00)

.605 (15.37)

.549 (13.95)

0.26 (0.66)

0.14 (0.36)

.051 (1.30)

.049 (1.24)

.110 (2.79)

.068 (1.72)

.037 (0.94)

.026 (0.66)

0° - 8°

.100 (2.54) TYP.

TO-220-3

.185 (4.70)

.165 (4.19)

.410 (10.41)

.390 (9.91)

.113 (2.87)

.103 (2.62)

.055 (1.40)

.045 (1.14)

.156 (3.96)

.146 (3.71)

DIA.

.258 (6.55)

.230 (5.84)

3° - 7.5°

5 PLCS.

.594 (15.09)

.569 (14.45)

.244 (6.20)

.234 (5.94)

.560 (14.22)

.518 (13.16)

.055 (1.40)

.045 (1.14)

.0.20 (0.51)

.012 (0.30)

.037 (0.94)

.027 (0.69)

.105 (2.67)

.095 (2.41)

.115 (2.92)

.095 (2.41)

.205 (5.21)

.195 (4.95)

Dimensions: inches (mm)

Sales Offices

TelCom Semiconductor

1300 Terra Bella Avenue

P.O. Box 7267

Mountain View, CA 94039-7267

TEL: 415-968-9241

TelCom Semiconductor

Austin Product Center

9101 Burnet Rd. Suite 214

Austin, TX 78758

TelCom Semiconductor H.K. Ltd.

10 Sam Chuk Street, Ground Floor

San Po Kong, Kowloon

Hong Kong

TEL: 512-873-7100

TEL: 852-2324-0122

FAX: 415-967-1590

FAX: 512-873-8236

FAX: 852-2354-9957

E-Mail: liter@c2smtp.telcom-semi.com

13

TCL1584/1585/1587-04 6/6/97

Printed in the U.S.A.


型号：	TCL1585-3.3CAB
厂家：	TELCOM SEMICONDUCTOR, INC
描述：	7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS 7A / 5A / 4.6A / 3A ，响应速度快，低压差正线性稳压器稳压器
文件：	总13页 (文件大小：145K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

TCL1585-3.3CAB [TELCOM]

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