LX8580 datasheet(3/4 Pages) MICROSEMI

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7A VERY LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR

LX8580

PRODUCT DA T ABOOK 1996/1997

Rev. 1.0 11/99

P RODUCTION D ATA S HEET

Reference Voltage

REF

CTRL = 2.75V, VPWR = 2V, ILOAD = 10mA, TJ = 25°C

CTRL = 2.7V to 6V, VPWR = 1.75V to 5.5V, IOUT = 10mA to 4A

CTRL = 2.7V to 6V, VPWR = 2.05V to 5.5V, IOUT = 10mA to 7A

Line Regulation

∆V

REF (VIN)

CTRL = 2.5V to 12V, VPWR = 1.75V to 5.5V, ILOAD = 10mA, TJ = 25°C

CTRL = 2.5V to 12V, VPWR = 1.75V to 5.5V, ILOAD = 10mA

Load Regulation

∆V

REF

OUT)

CTRL

= 2.75V, V

PWR = 2.1V, ILOAD = 10mA to 7A (VADJ = 0)

Thermal Regulation

∆V

OUT (Pwr)

30ms Pulse

Thermal Resistance

RθJT

Control Circuitry/Power Transistor

Ripple Rejection

CTRL = VPWR = 3.75V Avg, VRIPPLE = 1VP-P, VADJ = 0V, IOUT = 4A

Control Pin Current (Note 3)

CTRL

= 2.75V, V

PWR = 2.05V, ILOAD = 100mA

CTRL

= 2.75V, V

PWR = 2.05V, ILOAD = 4A

CTRL

= 2.75V, V

PWR = 1.75V, ILOAD = 4A

CTRL

= 2.75V, V

PWR = 2.05V, ILOAD = 7A

Adjust Pin Current

ADJ

CTRL

= 2.75V, V

PWR = 2.05V, ILOAD = 0mA (VADJ = 0)

Current Limit

Iθ(MAX)

CTRL

= 2.75V, V

PWR = 2.05V, ∆VOUT = 100mV (VADJ = 0)

Dropout Voltage (Control Section)

CTRL - VOUT

PWR = 2.05V, ILOAD = 100mA

Minimum V

CTRL (Note 2)

PWR = 2.05V, ILOAD = 1A

PWR - VOUT)VPWR = 2.05V, ILOAD = 2.75A

PWR = 2.05V, ILOAD = 4A

PWR = 2.05V, ILOAD = 7A

Dropout Voltage (Power Section)

PWR - VOUT

CTRL

= 2.75V, I

LOAD = 100mA

Minimum V

PWR (Note 2)

CTRL

= 2.75V, I

LOAD = 1A

PWR - VOUT)VCTRL

= 2.75V, I

LOAD = 2.75A

ADJ = 0)

CTRL

= 2.75V, I

LOAD = 4A, TJ = 25°C

CTRL

= 2.75V, I

LOAD = 4A

CTRL

= 2.75V, I

LOAD = 7A, TJ = 25°C

CTRL

= 2.75V, I

LOAD = 7A

Minimum Load Current

CTRL

= 5V, V

PWR = 3.3V, VADJ = 0V

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, these specifications apply over the operating ambient temperatures 0°C

≤ T

A ≤ 125°C.

Low duty cycle pulse testing

techniques are used which maintains junction and case temperatures equal to the ambient temperature.)

Parameter

Symbol

Test Conditions

Units

LX8580

Min.

Typ.

Max.

1.243

1.250

1.257

1.237

1.250

1.263

1.237

1.250

1.263

m V

0.002

0.020

%/W

0.65

2.70

°C/W

d B

310

120

µA

7.1

0.90

1.15

1.00

1.15

1.05

1.18

1.06

1.20

1.10

1.30

0.05

0.17

0.10

0.22

0.20

0.38

0.30

0.40

0.30

0.50

0.52

0.62

0.56

0.80

510

Note 2.

Dropout is caused by either minimum control voltage (V

CTRL) or minimum power voltage (VPWR). Both parameters are specified with respect to

the output voltage. The specifications represent the minimum input/output voltage required to maintain 1% regulation.

Note 3.

The control pin current is the drive current required for the output transistor. This current will track output current with roughly a 1:100 ratio.

The minimum value is equal to the quiescent current of the device.

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