PIN FUNCTIONS

N.

Name

Description

1

POWER OUTPUT

The device is provided with short circuit protection.

4

POWER SUPPLY

Supply voltage input.

5

ENABLE INPUT

TTL compatible input. High level on this pin means output current ON.

The low level voltage switches off the charge pump, the power stage and

the diagnostic output reducing to the minimum value the quiescent current.

7

GROUND

This pin must be connected to ground.

8

DIAGNOSTIC FEEDBACK

The diagnostic circuit is active in input high level condition. This output

detects with Tipically 50

– Overvoltage condition.

– Thermal shutdown.

– Short circuit. The power stage current is internally limited at 1.5A.

The diagnostic output is active low. The diagnostic delay time allows to

avoid spurious diagnosys(i.e.: turn ON overcurrent, overvoltage spikes etc.).

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Operating Supply Voltage

6

25

V

On Resistance

°C

Input > 2V, Full T range

0.6

0.8

1.2

Ω

Ω

Off State Supply Current

°C

°C

130

300

µA

µA

On State Supply Current

4

mA

Enable Low Level

0.8

V

Enable High Level

2

V

Enable Current

0V < Vi <5V

10

µA

Diagnostic Output Leakage Current

10

µA

Diagnostic Output Saturated

Voltage

Isink < 3.5mA

0.4

V

Diagnostic Delay Time

°C30

µs

Output ON Delay Time

°C30

µs

Output ON Rise Time

Tj = 25

°C

100

µs

Output OFF Delay Time

Tj = 25

°C80

µs

Output OFF Fall Time

Tj = 25

°C

100

µs

Overvoltage Detection ON

25

V

Overvoltage Hysteresis

2

5

V

Overcurrent Detection ON

0.5

1.5

A

Overtemperature Detection ON

150

°C

Overtemperature Hysteresis

25

50

°C

L9820

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