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L4955

5A ULDO LINEAR REGULATORS FAMILY

STMicroelectronics 

L4955

PIN FUNCTIONS

HW VW Name

Fun ction

1

1

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

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 22µF is required to insure stability.

THERMAL DATA (HEPTAWATT & VERSAWATT packages)

Symbol

Rth j-case

Rth j-amb

Parameter

Thermal Resistance Junction-case

Thermal Resistance Junction-ambient

Thermal Shutdown

Thermal Hysteresis

Max.

Max.

Typ.

Typ.

Value

2.5

50

150

20

Unit

°C/W

°C/W

°C

°C

L•4=9S55pe-cEifLicEaCtioTnRsICreAfeLrrCeHd AtoRTAJCfrToEmR0IS°CTItCoS+1(T2j5=°C2.5°C, Vin = 12V, unless otherwise specified).

Symbol

VIN

VO

Parameter

Operating Supply Voltage

Output Voltage (1)

∆VO

Line regulation (1)

∆VO

Load regulation (1)

VO

Dropout Voltage

IO

Current Limiting

Short Circuit Current

Programmable Current

Limiting

IQ

Quiescent Current

Stand By Current

Inhibit Threshold

Inhibit Hysteresis

Inhibit Bias Sink Current

Power Good Threshold

Power Good Hysteresis

Power Good Saturation

Ripple Rejection

(1) Output voltage connected to ADJ.

Test Condition

0.1A < IO < 5A; 4.5V < VIN <12V

4.5V < VIN < 12V; 0.1A < IO < 5A

4.5V < VIN <22V; IO = 10mA

0.1A < IO < 5A

IO = 5A

VIN ≥ 4.5V

IO = 2A

VO = 0V

Rlim = 13kΩ

Rlim = 47kΩ

0.1A < IO < 5A

INH = 5V

Rising Edge

CL = 0

CL = 13k

INH = 5V or 0.8V

Rising Edge

IPG = 4mA

f = 120Hz, IO = 5A

VIN = 6V ∆VIN = 2VPP

Min. Typ. Max.

4.5

22

1.235 1.26 1.285

• 1.222 1.26 1.298

2

10

2

10

0.75 1.1

•

1.1

1.5

•

0.55 0.75

• 5.1

6.3

7.5

•

1.8

• 2.55

3

3.45

• 0.70 0.85 1.00

2

3

2.7

4

120 200

• 1.1 1.26 1.42

0.2

20

60

0.9 x VO

•

0.2

•

0.1

0.4

60

75

Unit

V

V

V

mV

mV

V

V

V

A

A

A

A

mA

mA

µA

V

V

µA

V

V

V

dB

3/14

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