L9347
Intelligent quad (2x5A/2x2.5A) low-side switch
Features
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Quad low-side switch
2 x 5A designed as conventional switch
2 x 2.5A designed as switched current-
regulator
Low ON resistance 2 x 0.2
, 2 x 0.35
(typ.)
Power SO-36 package with integrated
cooling area
Integrated free wheeling and clamping Z
diodes
Output slope control
Short circuit protection
Selective overtemperature shutdown
Open load detection
Ground and supply loss detection
External clock control
Recirculation control
Regulator drift detection
Regulator error control
Regulator resolution 5mA
Status monitoring
Status push-pull stages
Electrostatic discharge (ESD) protection
Device summary
Part number
L9347LF
L9347LF-TR
L9347DIE1
Package
PowerSO-36
PowerSO-36
Bare die
Packing
Tray
Tape and reel
Bare die
PowerSO-36
Bare Die
Description
The L9347 is an integrated quad low-side power
switch to drive inductive loads like valves used in
ABS systems. Two of the four channels are
current regulators with current range from 250mA
to 2.25A and an accuracy of 10%.
All channels are protected against fail functions.
They are monitored by a status output.
Table 1.
September 2013
Rev 3
1/29
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1
Contents
L9347
Contents
1
2
3
Block diagram and pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Input circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Output stages (not regulated) Channel 1 and 2 . . . . . . . . . . . . . . . . . . . . 13
Current regulator stages Channel 3 and 4 . . . . . . . . . . . . . . . . . . . . . . . . 13
Protective circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Error detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Drift detection (regulated channels only) . . . . . . . . . . . . . . . . . . . . . . . . . 17
Other test modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Diagnostic table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4
Timing diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.1
4.2
Non regulated channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Regulated channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5
6
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2/29
L9347
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical characteristcs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Operating range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Detected errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Special test mode functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Diagnostic table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3/29
List of figures
L9347
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Input PWM to output current range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Current accuracy according to the input and clock frequency ratio . . . . . . . . . . . . . . . . . . 14
Output slope, resistive load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Overload switch OFF delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Normal condition, resistive load, pulsed input signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Current overload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Under current condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Open load condition in the case of pulsed input signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Pulsed open load conditions (regulated and non-regulated channels) . . . . . . . . . . . . . . . . 23
Normal condition, inductive load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Current overload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Recirculation error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Current regulation error (e.g. as a result of voltage reduction) . . . . . . . . . . . . . . . . . . . . . . 25
Over temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Test mode 4 (VEN low). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
PowerSO-36 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . 27
4/29
L9347
Block diagram and pin connections
1
Block diagram and pin connections
Figure 1.
Block diagram
VS
VCC
VDD
Internal Supply
EN
Overtemperature
Channel 4
CLK
Open Load
IN1
LOGIC
Overload
Q1
Overtemperature
Channel 1
ST1
GND-det.
Open Load
IPD
D4
IN4
LOGIC
&
DA
Overload
Q4
ST4
GND-det.
Overtemperature
Channel 3
Overtemperature
Channel 2
Open Load
IN2
LOGIC
Overload
IPD
Q2
ST2
GND-det.
Open Load
IPD
D3
IN3
LOGIC
&
DA
Overload
Q3
ST3
GND-det.
drift-det.
TEST
IPD
99AT0059
GND
5/29
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