Datasheet EZ1583CT-2.5, EZ1583CT-1.5, EZ1583CT, EZ1583CM.TR, EZ1583CM-2.5.TR Datasheet (Semtech Corporation)

© 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

DUAL INPUT
LOW DROPOUT REGULATOR

EZ1580/EZ1581
EZ1582/EZ1583

February 26, 1999

1

Pentium is a registered trademark of Intel Corporation.
PowerPC is a trademark of IBM.
AMD5

K

86 and K6 are trademarks of Advanced Micro Devices.

DEVICE PACKAGE I

OUT

(A) V

OUT

(V)

EZ1580CT-X.X TO-220, 7 See Note (1)
EZ1581CT-X.X 5-pin 5
EZ1582CT-X.X 3

EZ1583CT-X.X 1.5
EZ1580CM-X.X TO-263, 7 See Note (1)
EZ1581CM-X.X 5-pin

(2)

5
EZ1582CM-X.X 3
EZ1583CM-X.X 1.5

ORDERING INFORMATION

FEATURES

•= 540mV dropout @ 7A in dual supply mode

(EZ1580)

•= Remote sense operation

•= Fast transient response

•= 0.5% initial accuracy

•= 5 Pin TO-220 and TO-263 packages

DESCRIPTION

The EZ158X family of high performance positive
voltage regulators are designed for use in applications
requiring very low dropout voltage at 7, 5, 3 and 1.5
amps. When supplying 2.5V on motherboards where
both 5V and 3.3V supplies are available, the superior
dropout characteristics of the EZ158X result in reduced
heat dissipation compared to regular LDOs, thus
allowing heat sink size reduction. Additionally, the
EZ158X provides excellent regulation over variations in
line, load and temperature. Remote sense operation
allows compensating for trace, connector and other
resistive losses.

Outstanding features include very low dropout
performance at rated current, fast transient response,
remote sense, internal current limiting, thermal
shutdown and safe operating area protection of the
output device. The EZ158X is a five terminal
adjustable voltage regulator available in the popular 5
pin TO-220 and TO-263 plastic packages.

APPLICATIONS

•=

Microprocessor supplies

•= Split plane microprocessor supplies

•= Pentium® Processor P54C and P55C

•= PowerPC™ 603/604EV

•= AMD5

K

86™, AMD K6

ABSOLUTE MAXIMUM RATINGS

Parameter Symbol Maximum Units

Input Voltage
V

POWER

V

CONTROL

V

P

V

C

7

13.2

V

Power
Dissipation

P

D

Internally

Limited

W

Thermal Resistance
Junction to Case
EZ1580/1 TO-220
EZ1580/1 TO-263
EZ1582/3 TO-220
EZ1582/3 TO-263

θ

JC

2
2
3
3

°C/W

Thermal Resistance
Junction to Ambient
EZ158X TO-220
EZ158X TO-263

θ

JA

50
60

°C/W

Operating Junction
Temperature Range

T

J

0 to 125 °C

Storage Temperature
Range T

STG

-65 to 125 °C

Lead Temperature
(Soldering) 10 Sec.

T

LEAD

260 °C

Notes:
(1) Where -X.X denotes voltage options. Available
voltages are: 1.5V and 2.5V. Leave blank for ad­justable version (1.3 to 5.7V).
(2) Add suffix ‘TR’ for tape and reel (TO-263).

BLOCK DIAGRAM

TEL:[phone] FAX:[phone] WEB:http://www.semtech.com

© 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

DUAL INPUT
LOW DROPOUT REGULATOR

EZ1580/EZ1581
EZ1582/EZ1583

February 26, 1999

2

PIN CONFIGURATION

PIN DESCRIPTION

Pin Pin Name Pin Function

1 SENSE This pin is the positive side of the reference voltage for this device. With this pin it is possible to

Kelvin sense the output voltage at the load.

2 ADJUST /

GROUND

This pin is the negative side of the reference voltage for the device. Transient response can be
improved by adding a small bypass capacitor from the adjust pin to ground.

This pin is the bottom end of the internal resistor feedback chain for fixed output voltage parts,

and should be connected to ground.
3 OUTPUT This is the power output of the device, and is electrically connected to the TAB.
4 CONTROL This pin is the supply pin for the control circuitry for the device. The current flow into this pin will

be approximately 1% of the output current. For the device to regulate, the voltage at this pin must

be between 1.0V and 1.3V greater than the output voltage (see dropout specifications).
5 POWER This is the collector input to the power device of the EZ158X. The output load current is supplied

through this pin. For the device to regulate, the voltage on this pin must be between 0.1V and

0.7V greater than the output voltage, depending upon load current (see dropout specifications).

© 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

DUAL INPUT
LOW DROPOUT REGULATOR

EZ1580/EZ1581
EZ1582/EZ1583

February 26, 1999

3

(1) Unless otherwise specified, V

OUT

= V

SENSE

, V

ADJ

= 0V.
(2) Required to maintain regulation. Voltage set resistors R1, R2 are usually utilized for minimum load current.
(3) Current used to drive the output section; minimum value equals the standby current of the device.
(4) V

C

= VP = 3.75V Avg; V

RIPPLE

= 1V

PK-PK

.
(5) 30ms.
(6) Over Temp (O.T.) = over specified operating junction temperature range.
(7) Minimum input/output voltage required to maintain 1% regulation.

ELECTRICAL CHARACTERISTICS

Test Conditions

(1)

Test Limits

Parameter Symbol V

CNTL

Volts

V

PWR

Volts

Amps T

J

(6)

Min Typ Max Units

Reference Voltage V

REF

2.75 2.00 0.01 25°C 1.243 1.250 1.257

EZ1583
EZ1582
EZ1581
EZ1580

2.7 - 12 2.05 - 5.5

0.01 - 1.5

0.01 - 3.0

0.01 - 5.0

0.01 - 7.0

O.T. 1.237 1.250 1.263 V

Line Regulation REG

(LINE)

2.5 - 12 1.75 - 5.5 0.01 O.T. 1.0 3.0 mV

Load Regulation
EZ1583
EZ1582
EZ1581
EZ1580

REG

(LOAD)

2.75 2.1

0.01 - 1.5

0.01 - 3.0

0.01 - 5.0

0.01 - 7.0

O.T. 1.0 5.0 mV

Minimum Load Current

(2)

I

O

53.3 O.T. 5.010mA

Control Pin Current

(3)

EZ1583
EZ1582
EZ1581
EZ1580

I

C

2.75 2.05

1.5

3.0

5.0

7.0

O.T.

6.0
30
33
60

120 mA

Adjust Pin Current I

ADJ

2.75 2.05 0.01 O.T. 50 120 µA

Current Limit
EZ1583
EZ1582
EZ1581
EZ1580

I

CL

2.75 2.05 O.T.

1.6

3.1

5.1

7.1

A

Ripple Rejection

(4)

EZ1583
EZ1582
EZ1581
EZ1580

R

A

3.75 3.75

0.75

1.5

2.5

3.5

25°C 60 80 dB

Thermal Regulation

(5)

REG

(THERMAL)

0.002 0.02 %/W

Dropout Voltage

(7)

Minimum V

CNTL

EZ1583
EZ1582
EZ1581
EZ1580

V

C-VO

2.05

1.5

3.0

5.0

7.0

O.T.

1.00

1.05

1.10

1.15

1.15

1.18

1.25

1.30

V

Dropout Voltage

(7)

Minimum V

POWER

EZ1583 1.5 25°C

O.T.

0.40

0.50

0.50

0.60

EZ1582 V

P-VO

2.75 3.0 25°C
O.T.

0.40

0.50

0.50

0.60

V

EZ1581 5.0 25°C

O.T.

0.40

0.50

0.50

0.60

EZ1580 7.0 25°C

O.T.

0.54

0.70

0.62

0.80

NOTES

© 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

DUAL INPUT
LOW DROPOUT REGULATOR

EZ1580/EZ1581
EZ1582/EZ1583

February 26, 1999

4

TYPICAL APPLICATIONS

(1)(2)

GROUND GROUND

3.3V POWER IN

2.5V OUT

5V CONTROL IN

C2
10uF

U1 EZ158XCX-2.5

4

3

2

1

5

CONTROL

OUTPUT

GND

SENSE

POWER

C3
68uF

C1
33uF

GROUND

1.5V OUT

3.3V CONTROL IN

2.5V POWER IN

GROUND

C2
10uF

C3
100uF

C1
47uF

U1 EZ158XCX-1.5

4

3

2

1

5

CONTROL

OUTPUT

GND

SENSE

POWER

2.5V OUT

3.3V POWER IN

5V CONTROL IN

GROUND

GROUND

C2
10uF

C1
33uF

C3
68uF

R1
124

R2
124

U1 EZ158XCX

4

3

2

1

5

CONTROL

OUTPUT

ADJ

SENSE

POWER

VREF

2RI

1R

2R

1VV

ADJREFOUT

•+

ö

ç
è

æ

+=

Adjustable Output Parts

(3)

Fixed Output Parts

NOTES:

(1) Capacitor values are for reference only. Good quality, low ESR tantalum or aluminum electrolytic capacitors
should be used. Increasing the value of the output capacitor will improve the overall transient response.
(2) If the same voltage is input to both POWER and CONTROL, then the dropout voltage will become 1.3V maxi­mum.
(3) A small (~0.033µF) capacitor can be used to bypass the ADJUST pin to improve transient response, if needed.

© 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

DUAL INPUT
LOW DROPOUT REGULATOR

EZ1580/EZ1581
EZ1582/EZ1583

February 26, 1999

5

DEVICE OUTLINE - TO-220, 5 PINAPPLICATION INFORMATION

The EZ158X is a low dropout regulator designed to
power the next generation of low voltage, split voltage
plane processors, such as the Pentium® Processor
P55C, the IBM PowerPC™ 603EV and 604EV and the
AMD5

K

86™ and K6 Processors.
The dropout voltage is minimized by utilizing a
separate input voltage, V

CONTROL

, which should exceed

V

OUT

by at least 1.3V. The 2.5V power for the load

(microprocessor core) can be derived from a 3.3V
system supply. Since the efficiency of a linear regulator
is the ratio of the output to the input voltage, heat
dissipation is reduced by using a 3.3 input, thereby
lowering heatsink and cooling fan costs. For a load of
7A at 2.5V, the regulator would dissipate 17.5W when
converting from 5V, but only 5.6W from a 3.3V input.
Remote Kelvin sensing of the output voltage can be
achieved by connecting the sense pin to the output at
the load. Remote sensing will reduce errors
associated with resistive trace losses between
regulator and processor.

DEVICE OUTLINE - TO-263, 5 PIN MINIMUM LAND PATTERN - TO-263, 5 PIN