ST L6375S User Manual

0.5 A high-side driver intelligent power switch

Features

■ 0.5 A output current

■ 8 V to 35 V supply voltage range

■ Internal current limiting

■ Thermal shutdown

■ Open ground protection

■ Internal negative voltage clamping for fast

demagnetization

■ Differential inputs with large common mode

range and threshold hysteresis

■ Undervoltage lockout with hysteresis

■ Open load detection

■ Two diagnostic outputs

■ Output status LED driver

■ Non-dissipative short-circuit protection

■ Immunity against burst transient

(IEC 61000-4-4)

■ ESD protection (human body model ±2 kV)

L6375S

SO-8

Description

The L6375S is a monolithic intelligent power
switch in BCDmultipower technology, for driving
inductive or resistive loads with controlled output
voltage slew rate and short-circuit protection.

An internal clamping diode enables the fast
demagnetization of inductive loads. Diagnostics
for CPU feedback and extensive use of electrical
protection make this device extremely rugged and
specially suitable for industrial automation
applications.

Table 1. Device summary

December 2011 Doc ID 12603 Rev 8 1/17

Order codes Op. temp. range Package Packaging

L6375S

Tu b e

-25 to +125 °C SO-8

L6375STR Tape and reel

www.st.com

17

Contents L6375S

Contents

1 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.4 Switching waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.5 Input section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.6 Overtemperature protection (OVT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.7 Undervoltage protection (UV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.8 Overcurrent operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.9 Diagnostic logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.10 Demagnetization of inductive loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.11 Diagnostic truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3 Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2/17 Doc ID 12603 Rev 8

L6375S Block diagram and pin description

1 Block diagram and pin description

Figure 1. Block diagram

Doc ID 12603 Rev 8 3/17

Block diagram and pin description L6375S

Figure 2. Pin connection (top view)

SO-8

1.1 Pin description

Table 2. Pin description

Pin n° Pin name Function

1 GND Ground

2 OUT High side output with built-in current limitation

3V

S

4 Output status

5 DIAG1

Supply voltage input; the value of the supply voltage is monitored to
detect undervoltage condition

This current source output is capable of driving an LED to signal the
status of the output pin. The pin is active (source current) when the
output pin is considered high (see Figure 4)

DIAGNOSTIC 1 output. This open drain reports the IC working
conditions (see Table 6: Diagnostic truth table)

6 DIAG2

DIAGNOSTIC 2 output. This open drain reports the IC working
conditions (see Table 6: Diagnostic truth table)

7 IN+ Comparator inverting input

8 ON-DELAY Programmable ON time interval duration during short-circuit operation

4/17 Doc ID 12603 Rev 8

L6375S Electrical specifications

2 Electrical specifications

2.1 Absolute maximum ratings

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit

V

Supply voltage (tw < 10 ms) 50 V

S

V

Supply voltage (DC) 40 V

S

V

-V

Supply to output differential voltage Internally limited V

out

S

od Externally forced voltage -0.3 to 7 V

V

od Externally forced current ±1 mA

I

I

out Output current (see also Isc) Internally limited A

Output voltage Internally limited V

V

out

P

TOT

V

diag

I

diag

I

Vi Input voltage -10 to V

Top Ambient temperature, operating range -25 to 85 °C

Power dissipation Internally limited W

External voltage -0.3 to 40 V

Externally forced current -10 to 10 mA

i Input current 20 mA

+0.3 V

S

T

J

STG Storage temperature -55 to 150 °C

T

E

I

2.2 Thermal data

Table 4. Thermal data

Symbol Parameter Value Unit

R

thJA

R

thJP

1. When mounted on a standard single-sided FR-4 board with 0.5 cm2 of Cu (at least 35 μm thick) connected
to all V

Junction temperature, operating range
(see Section 2.6)

-25 to 125 °C

Energy inductive load TJ = 85 °C 200 mJ

Thermal resistance junction-ambient max.

100

(1)

Thermal resistance junction-pins max. 15 °C/W

pins. Horizontal mounting and no artificial air flow.

CC

°C/W

Doc ID 12603 Rev 8 5/17

Electrical specifications L6375S

2.3 Electrical characteristics

VS = 24 V; TJ = –25 to +125 °C, unless otherwise specified.

Table 5. Electrical characteristics

Symbol Parameter Test condition Min. Typ. Max. Unit

V

V

V

V

V

V

I

V

V

I

V

V

V

dch

Supply voltage for valid

smin

diagnostic

Operative supply voltage 8 24 35 V

S

Undervoltage threshold 1 7 7.5 8 V

sth1

Undervoltage threshold 2 6.5 7 7.5 V

sth2

Undervoltage hysteresis 300 500 700 mV

shys

I

Quiescent current Output open 800 μA

q

Quiescent current Output ON 1.6 mA

qo

Input threshold voltage 0.8 1.3 2 V

ith

Input threshold hysteresis 50 400 mV

iths

Input low level voltage -7 0.8 V

il

Input high level voltage V

ih

Input high level voltage V

ih

Input bias current Vi = -7 to 15 V -250 250 μA

I

ib

Delay capacitor charging
current

Output voltage drop

don

I

= > 0.5 mA;

diag

V

= 1.5 V;

diag

< 18 V 2 V

S

> 18 V 2 15 V

S

ON DELAY pin shorted to
ground

Iout = 500 mA T

= 125 °C

T

J

= 25 °C

J

Iout =625 mA TJ = 25 °C
TJ= 125 °C

4 35 V

- 3 V

S

2.5 μA

200
320
250
400

280
440
350
550

mV
mV
mV
mV

I

V

V

I

I

V

V

V

ohys

I

osd

Output leakage current Vi = LOW; V

olk

Output low state voltage Vi = HIGH; pin floating 0.8 1.5 V

ol

Internal voltage clamp

cl

V

-V

(

Short-circuit output current VS = 8 to 35 V; Rl = 2 Ω; 0.75 1.1 1.5 A

sc

Open load detection current Vi = Vih; TA= 0 to +85 °C 1 3 6 mA

old

Output status threshold 1

oth1

voltage

Output status threshold 2

oth2

voltage

Output status threshold
hysteresis

)

out

S

Output status source current V

6/17 Doc ID 12603 Rev 8

=0 100 μA

out

I

= 200 mA

o

single pulsed = 300 ms

48 53 58 V

4.5 5 5.5 V

4 4.5 5 V

300 500 700 mV

> V

out

; VOS = 2.5 V 2 4 mA

oth1