SGS Thomson Microelectronics L9821 Datasheet

.25APEAKOUTPUTCURRENT

.R

= 100mΩ

ON

.DIAGNOSTICAND PROTECTION

FUNCTIONS

.µP COMPATIBLE

.

GROUNDEDCASE

.INRUSHCURRENTLIMITINGCIRCUIT

DES CRIPTION

The L9821 High Side Driver realized with Multipo­wer - BCD mixed technology,drivesresistiveor in­ductiveloadswith one side connectedtoground.

The inputcontrolis TTLcompatibleanda diagnos­tic outputprovidesan indicationof load (open and
short) and device status (thermal and overvoltage
shutdown).Onchipthermalprotectionandshortcir­cuitprotectionare provided.

L9821

HIGH SIDE DRIVER

MULTIPOWER BCD TECHNOLOGY

Pentawatt

ORDERING NUMBER : L9821

Thedeviceis assembledinthePentawattpackage
withthe tab connectedtothe groundterminal.

BLOCK DIAGRAM

February 1997

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L9821

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value

Max Forward Voltage

V

S

Positive Transient Peak Voltage (dump :
5ms ≤ t

≤ 10ms, R

rise

source

≥ 0.5Ω)
– Resistive Load
– Inductive Load

Reverse Input Voltage – 0.3Vdc
Input Voltage Pin 2 (to GND)

V

I

V

Pin 4 Voltage

4

V

Pin 5 Voltage

5

(to GND)
(to GND)

Pin 1 Current

I

1

I

Pin 2 Current (forced)

2

I

Pin 4 Current (sink)

4

I

Pin 5 Current

5

Power Dissipation Internally Limited

TOT

Junction and Storage Temperature Range – 55°C to + 150°C

STG

T

P
,T

J

*due to the negativevoltage at the output during the switchingoff.

fall time constant = 100ms,

τ

f

– 0.3V / + Vs(Vs< 20V)
– 0.3V / + V

–3V/+V

50Vdc

50V (*)

Internally Limited

0.5mA
10mA

Internally Limited

60V

s(Vs

s(Vs

< 20V)

< 20V)

THERMAL DATA

Symbol Parameter Value Unit

R

th j-case

Thermal Resistance Junction-case Max 1.5 °C/W

PIN CONNECTI ON (top view)

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PI N FU NCTIO NS

L9821

1. POWERSUPPLY
Supplyvoltageinput.Whenthe supply reachesthe

maximumoperatingvoltage(32V)the deviceis tur­ned off, protectingitself and the load.
Turningoff guaranteedfor V

> 41V.

S

2. INPUT
TTL compatibleinput. High level on thispin means

outputcurrentON.Thelowlevelvoltageswitchesoff
the chargepump, thepower stage and the diagno­sticoutputreducingto the minimumvaluethe quie­scent current.

condition.Thisoutputdetects with Tipically45ms
delayat T

Overvoltagecondition.

-

Thermalshutdown.

-

Shortcircuit.Thepowerstagecurrentisinternally

-

limitedat 25A.
Open load. The open load conditionis detected

-

withload current< 0.6A.

=25°C thefollowing faults:

amb

The diagnosticoutput is active low. Thediagnostic
delay timeallowsto avoidspuriousdiagnosys(i.e :
turnON overcurrent,overvoltage spikesetc.).

3. GROUND
This pin must be connectedtoground.

4. DIAGNOSTICFEEDBACK

5. POWEROUTPUT
The device is provided with short circuit protection

at Vs ≤ 14.4V

The diagnosticcircuitis active in input high level

ELECTRICAL CHARACTERISTICS (V

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

OP

R

ON

I

SC

I

DL

I

OPD

V

clamp

I

Off

I

ON

V

IL

V

IH

I

I

I

LEAKD

V

SATD

T

Dd

t

dON

t

r

t

dOFF

t

f

Operat. Voltage 6 32 V
On Resistance Input >2V:Tj=25°C

Short circuit current 25 A
Over Current Detection Level 20 A
Open Load Detection Level Device ON 1.2 A
Output Under Voltage Clamping I
Off State Supply Current Tj= -40 to 35°C

ON State Supply Current Tj=25°C10mA
Input Low Level 0.8 V
Input High Level 2.0 V
Input Current Vi=V
Diagnostic Output Leakage

Voltage
Diagnostic Output Saturation

Voltage
Diagnostic Delay Time Tj=25°C; 45 ms
Output ON Delay Time Tj=25°C15µs
Output ON Rise Time Tj=25°C65µs
Output OFF Delay Time Tj=25°C50
Output OFF Fall Time Tj=25°C 100

= 14.4V; -40°C ≤ Tj≤ 125°C,unless otherwise specified)

S

0.1

Input >2V:Full T range

<6A Inductive -12 -4 V

load

=35to85°C

T

j

threshold

VCC = 5V
Diagnostic Output

I

<1.6mA 0.4 V

sink

0.2

100
300

15
10 µA

Ω

µA

A

µ

A

µ

s

µ

s

µ

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