Linear Technology LT1585, LT1584, LT1587 Datasheet

LT1584/LT1585/LT1587



FEATURES

■

Fast Transient Response

■

Guaranteed Dropout Voltage at Multiple Currents

■

Load Regulation: 0.05% Typ

■

Trimmed Current Limit

■

On-Chip Thermal Limiting

■

Standard 3-Pin Power Package

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APPLICATIONS

■

PentiumTM Processor Supplies

■

PowerPCTM Supplies

■

Other 2.5V to 3.6V Microprocessor Supplies

■

Low Voltage Logic Supplies

■

Battery-Powered Circuitry

■

Post Regulator for Switching Supply

LT1585/7CM, LT1584/5/7CT Adjustable
LT1585/7CM-3.3, LT1584/5/7CT-3.3 3.3V Fixed
LT1585CM-3.38, LT1584/5CT-3.38 3.38V Fixed
LT1585/7CM-3.45, LT1584/5/7CT-3.45 3.45V Fixed
LT1585/7CM-3.6, LT1584/5/7CT-3.6 3.6V Fixed

7A, 4.6A, 3A Low Dropout

Fast Response

Positive Regulators

Adjustable and Fixed

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DESCRIPTION

The LT®1584/LT1585/LT1587 are low dropout three­terminal regulators with 7A, 4.6A and 3A output current
capability, respectively. Design has been optimized for low
voltage applications where transient response and mini­mum input voltage are critical. Similar to the LT1083/4/5
family, it has lower dropout voltage and faster transient
response. These improvements make it ideal for low volt­age microprocessor applications requiring a regulated

2.5V to 3.6V output with an input supply below 7V.
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 that would create excessive junction temperatures.

The LT1585/LT1587 are available in both the through-hole
and surface mount versions of the industry standard 3-pin
TO-220 power package. The LT1584 is available in the
through-hole 3-pin TO-220 power package.

, LTC and LT are registered trademarks of Linear Technology Corporation.

Pentium is a trademark of Intel Corporation. PowerPC is a trademark of IBM Corporation.

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TYPICAL APPLICATION

3.3V, 7A, 4.6A, 3A Regulator

LT1584-3.3

≥ 4.75V

V

IN

* REQUIRED FOR STABILITY
LT1584: C2 = 22µF,
LT1585/LT1587: C2 = 10µF

NOTE: MICROPROCESSOR APPLICATIONS WITH LOAD TRANSIENTS OF 3.8A REQUIRE
OUTPUT DECOUPLING CAPACITANCE > 1300µF ON FIXED VOLTAGE PARTS TO ACHIEVE
< 50mV OF DEVIATION FROM NOMINAL OUTPUT. CONSULT FACTORY FOR DETAILS

+

C1
10µF

LT1585-3.3
LT1587-3.3

+

3.3V
7A, 4.6A, 3A

C2*
SOLID
TANTALUM

1585 TA01

Dropout Voltage vs Output Current

1.5

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

INPUT/OUTPUT DIFFERENTIAL (V)

0.6

0.5
0

OUTPUT CURRENT (A)

I

FULL LOAD

1585 TA02

1

LT1584/LT1585/LT1587

WW

W

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ABSOLUTE MAXIMUM RATINGS

VIN............................................................................. 7V

Operating Junction Temperature Range

Control Section.................................... 0°C to 125°C

Power Transistor ................................. 0°C to 150°C

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W



PACKAGE/ORDER INFORMATION

FRONT VIEW

3



2



1

M PACKAGE

3-LEAD PLASTIC DD PAK

θJA = 30°C/W* θJA = 50°C/W

FRONT VIEW

3



2



1

VIN

V

OUT


ADJ

VIN

V

OUT


GND

ORDER PART

NUMBER



LT1585CM
LT1587CM

LT1585CM-3.3
LT1585CM-3.38



LT1585CM-3.45
LT1585CM-3.6
LT1587CM-3.3

M PACKAGE

3-LEAD PLASTIC DD PAK

θJA = 30°C/W* θJA = 50°C/W

LT1587CM-3.45
LT1587CM-3.6

FRONT VIEW

T PACKAGE

3-LEAD PLASTIC TO-220

FRONT VIEW

T PACKAGE

3-LEAD PLASTIC TO-220

Storage Temperature Range ................. –65°C to 150°C

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

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PRECONDITIONI G

100% Thermal Limit Functional Test

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ORDER PART

3

2

1

3

2

1

VIN

V

OUT

ADJ

VIN

V

OUT

GND



LT1584CT-3.3
LT1585CT-3.3



LT1587CT-3.3
LT1584CT-3.38
LT1585CT-3.38

NUMBER

LT1584CT
LT1585CT
LT1587CT

LT1584CT-3.45
LT1585CT-3.45
LT1587CT-3.45
LT1584CT-3.6
LT1585CT-3.6
LT1587CT-3.6

* With package soldered to 0.5 square inch copper area over backside

ground plane or internal power plane. θ
>40°C/W with other mounting techniques.

can vary from 20°C/W to

JA

Consult factory for Industrial and Military grade parts.

ELECTRICAL CHARACTERISTICS

PARAMETER CONDITIONS MIN TYP MAX UNITS

Reference Voltage LT1584 1.5V ≤ (VIN – V

LT1585 1.5V ≤ (VIN – V
LT1587 1.5V ≤ (V

Output Voltage LT1584-3.3 4.75V ≤ VIN ≤ 6.3V, 0mA ≤ I

LT1585-3.3 4.75V ≤ VIN ≤ 7V, 0mA ≤ I
LT1587-3.3 4.75V ≤ VIN ≤ 7V, 0mA ≤ I

LT1584-3.38 4.75V ≤ VIN ≤ 6.38V, 0mA ≤ I
LT1585-3.38 4.75V ≤ VIN ≤ 7V, 0mA ≤ I

LT1584-3.45 4.75V ≤ VIN ≤ 6.45V, 0mA ≤ I
LT1585-3.45 4.75V ≤ VIN ≤ 7V, 0mA ≤ I
LT1587-3.45 4.75V ≤ VIN ≤ 7V, 0mA ≤ I

LT1584-3.6 4.75V ≤ VIN ≤ 7V, 0mA ≤ I
LT1584-3.6 4.80V ≤ VIN ≤ 7V, 0mA ≤ I
LT1584-3.6 4.80V ≤ VIN ≤ 6.6V, 0mA ≤ I
LT1584-3.6 4.85V ≤ V

1.5V ≤ (VIN – V

IN

4.75V ≤ V

) ≤ 3V, 10mA ≤ I

OUT

) ≤ 5.75V, 10mA ≤ I

OUT

) ≤ 5.75V, 10mA ≤ I

OUT

– V

) ≤ 5.75V, 10mA ≤ I

OUT

≤ 7V, 0mA ≤ I

IN

≤ 6.6V, 0mA ≤ I

IN

≤ 7A

OUT

≤ 4.6A, TJ ≥ 25°C

OUT

≤ 4A, TJ < 25°C

OUT

≤ 3A ● 1.225 (– 2%) 1.250 1.275 (+2%) V

OUT

≤ 7A

OUT

≤ 4.6A, TJ ≥ 25°C

OUT

≤ 4A, TJ < 25°C

OUT

≤ 3A ● 3.235 (– 2%) 3.300 3.365 (+2%) V

OUT

≤ 7A

OUT

≤ 4A ● 3.313 (– 2%) 3.380 3.465 (+2.5%) V

OUT

≤ 7A

OUT

≤ 4A

OUT

≤ 3A ● 3.381 (– 2%) 3.450 3.519 (+2%) V

OUT

≤ 6A ● 3.400 (– 5.5%) 3.600 3.672 (+2%) V

OUT

≤ 6A ● 3.450 (– 4%) 3.600 3.672 (+2%) V

OUT

≤ 7A ● 3.431 (– 4.7%) 3.600 3.672 (+ 2%) V

OUT

≤ 7A ● 3.481 (– 3.3%) 3.600 3.672 (+ 2%) V

OUT

2

LT1584/LT1585/LT1587

ELECTRICAL CHARACTERISTICS

PARAMETER CONDITIONS MIN TYP MAX UNITS

Output Voltage LT1585/7-3.6 4.75V ≤ VIN ≤ 7V, 0mA ≤ I

LT1585/7-3.6 4.80V ≤ VIN ≤ 7V, 0mA ≤ I
LT1585-3.6 4.80V ≤ VIN ≤ 7V, 0mA ≤ I
LT1585-3.6 4.85V ≤ V

Line Regulation LT1584/5/7 2.75V ≤ VIN ≤ 7V, I
(Notes 1, 2) LT1584/5/7-3.3 4.75V ≤ VIN ≤ 7V, I

LT1584/5-3.38 4.75V ≤ VIN ≤ 7V, I
LT1584/5/7-3.45 4.75V ≤ V
LT1584/5/7-3.6 4.75V ≤ VIN ≤ 7V, I

Load Regulation LT1584/5/7 (VN – V

≤ 7V, 0mA ≤ I

IN

OUT
OUT
OUT

≤ 7V, I

IN

OUT

OUT
OUT

) = 3V, TJ = 25°C, 10mA ≤ I

(Notes 1, 2, 3) LT1584/5/7-3.3 VIN = 5V, TJ = 25°C, 0mA ≤ I

LT1584/5-3.38 VIN = 5V, TJ = 25°C, 0mA ≤ I
LT1584/5/7-3.45 VIN = 5V, TJ = 25°C, 0mA ≤ I
LT1584/5/7-3.6 VIN = 5.25V, TJ = 25°C, 0mA ≤ I

Dropout Voltage LT1585/7 ∆V

LT1585/7-3.3 ∆V
LT1585-3.38 ∆V
LT1585/7-3.45 ∆V
LT1585/7-3.6 ∆V

LT1585 ∆V
LT1585-3.3 ∆V
LT1585-3.38 ∆V

LT1585-3.45 ∆V
LT1585-3.6 ∆V

LT1584 ∆V
LT1584-3.3 ∆V
LT1584-3.38 ∆V
LT1584-3.45 ∆V
LT1584-3.6 ∆V

= 1%, I

REF

= 1%, I

OUT

= 1%, I

OUT

= 1%, I

OUT

= 1%, I

OUT

= 1%, I

REF

∆V

= 1%, I

REF

= 1%, I

OUT

∆V

= 1%, I

OUT

= 1%, I

OUT

= 1%, I

OUT

= 1%, I

OUT

= 1%, I

REF

= 1%, I

OUT

= 1%, I

OUT

= 1%, I

OUT

= 1%, I

OUT

T

≥ 25°C ● 1.200 1.300 V

J

= 3A

OUT

= 3A

OUT

= 3A

OUT

= 3A

OUT

= 3A ● 1.150 1.300 V

OUT

= 4.6A, TJ ≥ 25°C

OUT

= 4A, TJ < 25°C

OUT

= 4.6A, TJ ≥ 25°C

OUT

= 4A, TJ < 25°C

OUT

= 4A

OUT

= 4A

OUT

= 4A ● 1.200 1.400 V

OUT

= 6A

OUT

= 6A

OUT

= 6A

OUT

= 6A

OUT

= 6A

OUT

TJ < 25°C ● 1.200 1.350 V

LT1584 ∆V
LT1584-3.3 ∆V
LT1584-3.38 ∆V
LT1584-3.45 ∆V
LT1584-3.6 ∆V

Current Limit LT1584 (VIN – V
(Note 3) LT1584-3.3 (VIN – V

LT1584-3.38 (VIN – V
LT1584-3.45 (V
LT1584-3.6 (VIN – V

LT1585 (VIN – V
LT1585-3.3 (V

IN

IN

REF
OUT
OUT
OUT
OUT

– V

– V

= 1%, I

= 1%, I
= 1%, I
= 1%, I
= 1%, I

OUT
OUT
OUT
OUT
OUT

OUT)
OUT)

= 7A

OUT

= 7A

OUT

= 7A

OUT

= 7A

OUT

= 7A ● 1.250 1.400 V

OUT

) = 3V
) = 3V
) = 3V
) = 3V
) = 3V ● 7.100 8.250 A

= 5.5V

= 5.5V
TJ ≥ 25°C ● 4.600 5.25 A
TJ < 25°C ● 4.100 5.25 A

LT1585-3.38 (VIN – V
LT1585-3.45 (V

IN

LT1585-3.6 (VIN – V
LT1587 (V

LT1587-3.3 (V
LT1587-3.45 (V
LT1587-3.6 (V

IN
IN
IN
IN

= 5.5V

OUT)

– V

= 5.5V

OUT)

= 5.5V ● 4.100 4.750 A

OUT)

– V

) = 5.5V

OUT

– V

) = 5.5V

OUT

– V

) = 5.5V

OUT

– V

) = 5.5V ● 3.100 3.750 A

OUT

≤ 3A ● 3.474 (– 3.5%) 3.600 3.672 (+ 2%) V

OUT

≤ 3A ● 3.528 (– 2%) 3.600 3.672 (+2%) V

OUT

≤ 4A ● 3.450 (– 4%) 3.600 3.672 (+ 2%) V

OUT

≤ 4A ● 3.492 (– 3%) 3.600 3.672 (+2%) V

OUT

= 10mA
= 0mA
= 0mA
= 0mA
= 0mA ● 0.005 0.2 %

≤ I

OUT

FULL LOAD

FULL LOAD

0.05 0.3 %

● 0.05 0.5 %

OUT
OUT
OUT

≤ I
≤ I
≤ I

OUT

FULL LOAD
FULL LOAD
FULL LOAD

≤ I

3

LT1584/LT1585/LT1587

ELECTRICAL CHARACTERISTICS

PARAMETER CONDITIONS MIN TYP MAX UNITS

Adjust Pin Current LT1584/5/7 ● 55 120 µA
Adjust Pin Current LT1584 1.5V ≤ (V

Change (Note 3) LT1585/7 1.5V ≤ (V
Minimum LT1584/5/7 1.5V ≤ (V

Load Current
Quiescent Current LT1584/5/7-3.3 V

LT1584/5-3.38 V
LT1584/5/7-3.45 V
LT1584/5/7-3.6 V

IN
IN
IN
IN

Ripple Rejection LT1584 f = 120Hz, C

LT1584-3.3 f = 120Hz, C
LT1584-3.38 f = 120Hz, C
LT1584-3.45 f = 120Hz, C
LT1584-3.6 f = 120Hz, C
LT1585 f = 120Hz, C

I

OUT

f = 120Hz, C
I

OUT

LT1585-3.3 f = 120Hz, C

I

OUT

f = 120Hz, C
I

OUT

LT1585-3.38 f = 120Hz, C
LT1585-3.45 f = 120Hz, C
LT1585-3.6 f = 120Hz, C
LT1587 f = 120Hz, C
LT1587-3.3 f = 120Hz, C
LT1587-3.45 f = 120Hz, C
LT1587-3.6 f = 120Hz, C

Thermal Regulation LT1584/5/7 TA = 25°C, 30ms pulse

LT1584/5/7-3.3 TA = 25°C, 30ms pulse
LT1584/5-3.38 TA = 25°C, 30ms pulse
LT1584/5/7-3.45 T

= 25°C, 30ms pulse

A

LT1584/5/7-3.6 TA = 25°C, 30ms pulse 0.004 0.02 %/W

Temperature Stability ● 0.5 %
Long-Term Stability TA = 125°C, 1000 Hrs. 0.03 1.0 %
RMS Output Noise TA = 25°C, 10Hz ≤ f ≤ 10kHz 0.003 %

(% of V

OUT

)

Thermal Resistance LT1584 T Package: Control Circuitry/Power Transistor 0.65/2.7 °C/W
Junction to Case LT1585 T Package: Control Circuitry/Power Transistor 0.7/3.0 °C/W

LT1585 M Package: Control Circuitry/Power Transistor 0.7/3.0 °C/W
LT1587 T Package: Control Circuitry/Power Transistor 0.7/3.0 °C/W
LT1587 M Package: Control Circuitry/Power Transistor 0.7/3.0 °C/W

– V

IN
IN

IN

) ≤ 3V, 10mA ≤ I

OUT

– V

) ≤ 5.75V, 10mA ≤ I

OUT

– V

) ≤ 5.75V ● 210 mA

OUT

OUT

≤ I

FULL LOAD

OUT

≤ I

FULL LOAD

● 0.2 5 µA

= 5V
= 5V
= 5V
= 5V ● 813 mA

= 25µF Tant., (V

OUT

= 25µF Tant., VIN = 5.8V, I

OUT

= 25µF Tant., VIN = 5.88V, I

OUT

= 25µF Tant., VIN = 5.95V, I

OUT

= 25µF Tant., VIN = 6.1V, I

OUT

= 25µF Tant., (V

OUT

IN

IN

– V

– V

) = 2.5V, I

OUT

OUT

OUT

) = 3V,

OUT

OUT
OUT

= 7A

= 7A
= 7A

= 7A

OUT

= 7A

= 4.6A, TJ ≥ 25°C

= 25µF Tant., (V

OUT

IN

– V

OUT

) = 3V,

= 4A, TJ < 25°C

= 25µF Tant., VIN = 6.3V,

OUT

= 4.6A, TJ ≥ 25°C

= 25µF Tant., VIN = 6.3V,

OUT

= 4A, TJ < 25°C

= 25µF Tant., VIN = 6.38V, I

OUT

= 25µF Tant., VIN = 6.45V, I

OUT

= 25µF Tant., VIN = 6.6V, I

OUT

= 25µF Tant., (V

OUT

= 25µF Tant., VIN = 6.3V, I

OUT

= 25µF Tant., VIN = 6.45V, I

OUT

= 25µF Tant., VIN = 6.6V, I

OUT

IN

– V

OUT

= 4A

OUT

= 4A

OUT

= 4A

OUT

) = 3V, I

OUT

OUT

OUT

= 3A

OUT

= 3A

= 3A

= 3A ● 60 72 dB

The

● denotes specifications which apply over the specified operating

temperature range.
Note 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.

Note 2: Line and load regulation are guaranteed up to the maximum power
dissipation (25W for the LT1584 in T package, 26.5W for the LT1585 in T
package, 18W for the LT1587 in T package). 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.

4

Note 3: I

FULL LOAD

as a function of input-to-output voltage. I
LT1584, 4.6A at T

is defined as the maximum value of output load current

≥ 25°C and 4A at TJ < 25°C for the LT1585/LT1585-3.3

J

FULL LOAD

is equal to 7A for the

and 3A for the LT1587. The remaining LT1585 fixed voltage versions are
4A.

The LT1585 and LT1587 have constant current limit with changes in
input-to-output voltage. The LT1584 has variable current limit which
decreases about 4A as input-to-output voltage increases from 3V to 7V.