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L9348

March 2002

SUPPLY VOLTAGE RANGE: 4.8 TO 18V

OUTPUT VOLTAGE UP TO 40V

OUTPUT VOLTAGE CLAMP DURING
RECIRCULATION OF INDUCTIVE LOADS

OUTPUT CURRENT CAPABILITY 2 X 5A AND
2 X 3A

LOW POWER DISSIPATION DURING
RECIRCULATION OF INDUCTIVE LOADS BY
INTEGRATED FREE WHEELING DIODES
(3A-DRIVERS ONLY)

LOW ON-RESISTANCE 2 X 0.2

, 2 X 0.35

(TYP.)

OUTPUT SHORT CIRCUIT CURRENT
PROTECTION

REAL TIME DIAGNOSTIC FUNCTIONS

OVERTEMPERATURE SHUTDOWN

SIGNAL- AND POWER-GROUND-LOSS
SHUTDOWN

3.3V CMOS COMPATIBLE INPUTS AND
STATUS

DESCRIPTION

The L9348 is a monolithic integrated quad low side
driver realized in advanced Multipower-BCD technol-
ogy. It is intended to drive inductive loads (relays,
electromagnetic valves) in automotive and industrial
applications.

PowerSO-36

BARE DIE

ORDERING NUMBERS:

L9348

L9348-DIE1

QUAD LOW SIDE DRIVER

Figure 1. Block Diagram

VREG

Voltage Regulator

REG

TSD

SCP

FAIL

C 166kHz

PWRES

CHANNEL1

PWRES

C 166kHz

IN1

ST1

IN2

ST2

ENA

GND

99AT0073

PGND2

PGND1

Diagnostic

CHANNEL2

PWRES

C 166kHz

REG

TSD

SCP

FAIL

C 166kHz

PWRES

CHANNEL3

IN3

ST3

PGND3

Diagnostic

IN4

ST4

CHANNEL4

PWRES

C 166kHz

PGND4

5A - DRIVER

3A - DRIVER

L9348

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Figure 2. Pin Connection

Table 1. Pin Description

N°

Pin

Function

1, 18,

19, 36

N.C.

(GND)

2, 3

PGND3

Power Ground Channel 3

4, 5

Power Output Channel 3 (3A switch)

6, 7

Recirculation Diode Channel 3

8, 9

Power Output Channel 1 (5A switch)

10, 11

Power Output Channel 2 (5A switch)

12, 13

Recirculation Diode Channel 4

14, 15

Power Output Channel 4 (3A switch)

16, 17

PGND4

Power Ground Channel 4

ST4

Status Output Channel 4

IN2

Control Input Channel 2

IN4

Control Input Channel 4

ST2

Status Output Channel 2

ENA

Enable

25, 26

PGND2

Power Ground Channel 2

GND

Signal Ground

Supply Voltage

N.C.

Not Connected

30, 31

PGND1

Power Output Channel 3

ST1

Status Output Channel 1

IN3

Control Input Channel 3

IN1

Control Input Channel 1

N.C.

ST3
IN1

IN3

33
32

ST1

31
30
29

N.C.
VS

GND

27
26
25

ENA

24
23

ST2
IN4

IN2

21
20

ST4
N.C.

N.C.

PGND3

2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18

N.C.

99AT0074

PGND4

PGND1

PGND2

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L9348

Table 2. Thermal Data

Table 3. Absolute Maximum Ratings
The absolute maximum ratings are the limiting values for this device. Damage may occur if this device is
subjected to conditions which are beyond these values.

Note: Human Body Model according to MIL883C. The device withstands ST1 class level.

Table 4. Operating Range

Symbol

Parameter

Test Conditions

Values

Unit

Min.

Typ.

Max.

Junction temperature

-40

150

°C

Junction temperature during
clamping (life time)

t = 30min

t = 15min

175
190

°C
°C

stg

Storage temperature

-55

150

°C

th j-case

Thermal resistance junction to
case

°C/W

Symbol

Parameter

Test Conditions

Value

Unit

Voltages

Supply voltage range

-0.3 to 40

, V

max. static Output voltage

, V

Input voltage range
(IN1 to IN4, EN)

| < 10mA

-1.5 to 6

Status output voltage range

| < 1mA

-0.3 to 6

DRmax

max. Reverse breakdown
voltage free wheeling diodes
D3, D4

= 100

Currents

Q 1/2

Output current at reversal
supply for Q1, Q2

-4

Q 3/4

Output current at reversal
supply for Q3, Q4

-2

Status output current range

-1 to 1

Q1/2

max. Discharging energy for
inductive loads per channel
Q1, Q2

= 25°C

= 150°C

FDmax

max. load current free
wheeling diodes

t < 5ms

ESD Protection

Supply and Signal pins

versus GND

Output pins (Q

, D

)

versus common ground (=short of

SGND with all PGND)

Symbol

Parameter

Test Conditions

Values

Unit

Min.

Typ.

Max.

Supply voltage

4.8

Junction temperature

-40

150

°C

L9348

4/13

Table 5. Electrical Characteristcs
The electrical characteristics are valid within the operating range (Table 4), unless otherwise specified

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Power Supply

Supply current

IN1...IN4, ENA

= H

Quiescent current (outputs OFF)

ENA

= L

D3/4

Quiescent current at pins D3/4

D3/4

18V;

IN3/4

= L

400

Diagnostic Functions

QU1 to 4

Output open load voltage
threshold

6.5V

= X; V

= L

0.3

0.33

0.36

x V

QU1 to 4

Output open load current
threshold

6.5V

= H; V

= H

140

QO1/2

Overload current threshold Q 1, 2 V

6.5V

7.5

QO3/4

Overload current threshold Q 3, 4 V

6.5V

Overtemperature shutdown
threshold

175

210

°C

Overtemperature hysteresis

°C

thPGL

Power-GND-loss threshold

1.5

2.5

3.5

thSGL

Signal-GND-loss threshold

150

330

510

Power Outputs (Q1 to Q4)

DSON1/2

Static drain-source ON-resistance
Q1, Q2

= 1A; V

9.5V

= 25°C

0.2

= 125°C

0.5

= 150°C

0.5

DSON3,4

Static drain-source ON-resistance
Q3, Q4

= 1A; V

9.5V

= 25°C

0.35

= 125°C

0.75

= 150°C

0.75

Z-diode clamping voltage
= threshold of flyback detection
Q3/4

100mA,

pos. supply V

D3/4

Clamping voltage

100mA,

neg. supply V

D3/4

Output pull down current

ENA

= H, V

= L

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L9348

(1).See chapter 2.0 Timing Diagrams; resistive load condition; V

(2).This parameter will not be tested but assured by design

(3).Wafer-measurement

(4).Measured on P-SO36 devices

(5).Short circuit between two digital outputs (one in high the other in low state) will lead to the defined result "LOW"

Qlk

Output leakage current

ENA

= L,T

= 25°C

= 125°C

FD3/4

Forward voltage of
free wheeling diodes D3, D4

D3/4

= -1.5A

0.5

1.75

PD0

Gate pull down resistor for
nonsupplied V

0V,

D3/4

6.5V

0.3

Timings

Output ON delay time

= 1A

Output ON fall time

= 1A

0.5

1.5

OFF

Output OFF delay time

= 1A

Output OFF rise time

= 1A

0.5

1.5

DSO

Overload switch-OFF delay time

Output OFF status delay time

0.75

1.5

2.25

filter

error detection filter time

5.8

OLOFF

OLOFF error detection filter time

Digital Inputs (IN1 to IN4, ENA)

Input low voltage

-1.5

Input high voltage

IHy

Input voltage hysteresis

100

Input pull down current

= 5V, V

6.5V

Digital Outputs (ST1 to ST4)

STL

Status output voltage in low state

0.4

STH

Status output voltage in high state

-40

2.5

3.45

-120

3.45

DIAGL

OUT

+ R

DSON

in low state

0.3

0.64

1.5

DIAGH

OUT

+ R

DSON

in high state

1.5

3.2

Table 5. Electrical Characteristcs
The electrical characteristics are valid within the operating range (Table 4), unless otherwise specified

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

L9348

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1.0 FUNCTIONAL DESCRIPTION

1.1

Overview

The four low-side switches are designed to drive inductive loads (relays, electromagnetic valves). For the 3A
switches (Q3/4) integrated free-wheeling diodes (D3/4) are available and can be used as recirculation path for
inductive loads. If either integrated nor external free-wheeling diodes are used the output voltage is clamped
internally during discharge of inductive loads. The switches are controlled by CMOS compatible inputs (IN1-4)
if the enable input is set to "high". The status of each switch is monitored by the related status output (ST1-4).

1.2

Input Circuits

The control and enable inputs are active high, featuring switching thresholds with hysteresis and pull-down cur-
rent sources. Not connected inputs are interpreted as "LOW". If the enable input is set to "LOW" the outputs are
switched off independent of the control input state (IN1-4).

1.3

Switching Stages

The four power outputs consist of DMOS-power transistors. The output stages are protected against short circuit
to supply. Integrated output voltage clamp limits the output voltage in case of inductive load current flyback. In-
ternal pull down current sources are provided at the outputs to assure a defined conditon in OFF mode. They
will be disconnected in the disable mode (ENA=L). If the supply of the device gets lost but the loads and D3/4
are still supplied, an internal pull down resistor discharges the gate of the DMOS-power transistor to avoid
switch on due to capacitive coupling.

1.4

Status Outputs

The CMOS compatible status outputs indicate the state of the drivers (LOW-level indicates driver in OFF state,
HIGH-level indicates driver in ON state). If an error occurs the status output voltage changes like described in
chapter 1.6 Error Detection.

1.5

Protective Circuits

The outputs are protected against current overload, overtemperature, and Power-GND-loss.

1.6

Error Detection

Two main error types are distinguished in the diagnostic logic. If current overload, overtemperature, signal-
GND-loss or a power-GND-loss occurs, the status output signal is inverted, an internal register is set and the
driver is shutdown. The reset is done by switching off the corresponding control input or the enable input for at
least the time t

(defined to 1.5ms typ.). See also Figure 6 in chapter 2.0 Timing Diagrams.

All other errors (openload, active output voltage clamp) only cause an inverted status output signal but no shut-
down of the driver. An internal register is set too, but the reset is triggered automatically after the time t

, if the

error condition is no longer valid (see Figure 7 and Figure 8).

Excepting the detection of the active output voltage clamp all errors are digitally filtered before they are inter-
preted by the diagnostic logic.

The table 6 below shows the different failure conditions monitored in ON and OFF state:

Table 6.

ON State

ENA = HIGH,

IN = HIGH

OFF State

ENA = HIGH,

IN = LOW

typ. Filter

time

Reset done by

Overloading of output
(also shorted load to supply)

ENA or INx = "LOW"
for t

1.5ms (typ.)

Open load
(under voltage detection)

internal timer (1.5ms typ.)

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L9348

1.7

Diagnostic Output at Pulse Width Operation (PWM)

If an input is operated with a pulsed signal (f

= 667 Hz typ.), the status does not follow each single pulse.

An internal delay t

of typ. 1.5ms leads to a continuous status output signal (see Figure 4 in chapter 2.0 Timing

Diagrams).

1.8

Diagnostic Table

In general the diagnostic follows the input signal in normal operating conditions. If any error is detected the di-
agnostic is inverted.

Open load
(under current detection)

internal timer (1.5ms typ.)

Overtemperature

ENA or INx = "LOW"
for t

1.5ms (typ.)

Power-GND-loss

ENA or INx = "LOW"
for t

1.5ms (typ.)

Signal-GND-loss

ENA or INx = "LOW"
for t

1.5ms (typ.)

Output voltage clamp active
(Q3/4 only)

internal timer (1.5ms typ.)

Table 7.

Operating Condition

Enable

Input

ENA

Control

Input

Power

Output

Status

Output

Normal function

L
L

H
H

H/PWM

OFF
OFF
OFF

L
L
L

Open load or short to ground

L
L

H
H

H/PWM

OFF
OFF
OFF

X
X
H

Overload or short to supply

Latched overload

Reset latch

H
H

H > L

H/PWM
H/PWM

H/PWM > L

OFF
OFF
OFF
OFF

L
L
L
L

Overtemperature

Latched overtemperature

Reset latch

H
H

H > L

H/PWM
H/PWM

H/PWM > L

OFF
OFF
OFF
OFF

L
L
L
L

Table 6.

ON State

ENA = HIGH,

IN = HIGH

OFF State

ENA = HIGH,

IN = LOW

typ. Filter

time

Reset done by

L9348

12/13

DIM.

inch

MIN.

TYP.

MAX.

MIN.

TYP.

MAX.

3.60

0.141

0.10

0.30

0.004

0.012

3.30

0.130

0.10

0.004

0.22

0.38

0.008

0.015

0.23

0.32

0.009

0.012

D (1)

15.80

16.00

0.622

0.630

9.40

9.80

0.370

0.385

13.90

14.50

0.547

0.570

0.65

0.0256

11.05

0.435

E1 (1)

10.90

11.10

0.429

0.437

2.90

0.114

5.80

6.20

0.228

0.244

2.90

3.20

0.114

0.126

0.10

0.004

15.50

15.90

0.610

0.626

1.10

0.043

0.80

1.10

0.031

0.043

(max.)

(1): "D" and "E1" do not include mold flash or protrusions
- Mold flash or protrusions shall not exceed 0.15mm (0.006 inch)
- Critical dimensions are "a3", "E" and "G".

PowerSO36

PSO36MEC

DETAIL A

h x 45°

DETAIL A

lead

slug

Gage Plane

0.35

DETAIL B

(COPLANARITY)

- C -

SEATING PLANE

0.12

A B

BOTTOM VIEW

OUTLINE AND

MECHANICAL DATA

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by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
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L9348

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ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: L9348-DIE1