°C to +125°C.

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Operating Supply Voltage

4.5

22

V

Output Voltage (1)

1.235

1.26

1.285

V

1.26

1.298

V

Line regulation

(1)

2

10

mV

Load regulation (1)

0.1A < IO < 5A

2

10

mV

Dropout Voltage

≥ 4.5V

0.75

1.1

V

•

1.1

1.5

V

•

0.55

0.75

V

Current Limiting

•

5.1

6.3

7.5

A

Short Circuit Current

•

1.8

A

Programmable Current

Limiting

Ω

Ω

•

•

2.55

0.70

3

0.85

3.45

1.00

A

A

Quiescent Current

2

2.7

3

4

mA

mA

Stand By Current

INH = 5V

120

200

µA

Inhibit Threshold

Rising Edge

•

1.1

1.26

1.42

V

Inhibit Hysteresis

0.2

V

Inhibit Bias Sink Current

INH = 5V or 0.8V

20

60

µA

Power Good Threshold

Rising Edge

V

Power Good Hysteresis

•

0.2

V

Power Good Saturation

•

0.1

0.4

V

Ripple Rejection

60

75

dB

(1) Output voltage connected to ADJ.

THERMAL DATA (HEPTAWATT & VERSAWATT packages)

Symbol

Parameter

Value

Unit

Thermal Resistance Junction-case

Max.

2.5

°C/W

Thermal Resistance Junction-ambient

Max.

50

°C/W

Thermal Shutdown

Typ.

150

°C

Thermal Hysteresis

Typ.

20

°C

PIN FUNCTIONS

HW

VW

Name

Fun ction

1

1

IN

Unregulated input voltage; this pin must be bypassed with a capacitor larger than 10

µF.

2

–

CL

A resistor connected between this pin and ground sets the programmable current limiting

value. When the programmable current limiting is not used the pin must be connected to GND.

3

–

INH

TTL-CMOS input. A logic high level on this input disables the device. An internal pull-down

insures full functionally even if the pin is open.

4

2

GND

Ground.

5

–

ADJ

The output is connected directly to this terminal for 1.26V operation; it is connected to the

output through a resistive divider for higher voltages.

6

–

PG

Open drain output, this signal is low when the output voltage is lower than 90%, otherwise is high.

7

3

OUT

Regulated output voltage. A minimum bypass capacitor of 22

µF is required to insure stability.

L4955

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