ST L6370 User Manual

2.5 A high-side driver industrial intelligent power switch

Features

■ 2.5 A output current

■ 9.5 V to 35 V supply voltage range

■ Internal current limiting

■ Thermal shutdown

■ Open ground protection

■ Internal negative voltage clamping to V

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

■ Protection against and surge transient (IEC

61000-4-5)

■ Immunity against burst transient (IEC 61000-4-

4)

■ ESD protection (human body model ±2kV)

- 50 V

S

L6370

PowerSO-20

Description

The L6370 is a monolithic intelligent power switch
in Multipower-BCD Technology, for driving
inductive or resistive loads. An internal clamping
diode enables the fast demagnetization of
inductive loads. Diagnostic for CPU feedback and
extensive use of electrical protections make this
device extremely rugged and specially suitable for
industrial automation applications.

Table 1. Device summary

Part number Op. temp. range, °CPackage Packaging

L6370D -25 to +85 PowerSO-20 Tube

L6370D013TR -25 to +85 PowerSO-20 Tape and reel

July 2010 Doc ID 4282 Rev 8 1/18

www.st.com

18

Contents L6370

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 AC operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3 Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.1 Diagnostic truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.2 Input section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.3 Diagnostic logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.4 Short circuit operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.5 Overtemperature protection (OVT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.6 Undervoltage protection (UV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.7 Demagnetization of inductive loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.1 PowerSO-20 mechanical data and package dimensions . . . . . . . . . . . . . 13

4.2 PowerSO-20 packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2/18 Doc ID 4282 Rev 8

L6370 Block diagram and pin description

1 Block diagram and pin description

Figure 1. Block diagram

V

S

IN+

IN-

INPUT

UNDER

VOLTAGE

+

-

CHARGE

PUMP

DRIVER

1.4V

ON-DELAY

OSC

NON DISSIPATIVE

SHORT CIRCUIT

CURRENT

LIMITATION

OPEN LOAD
DETECTION

OUTSTATUS

THERMAL

PROTECTION

DIAGNOSTIC

3mA

OUTPUT STATUS

D95IN208D

Figure 2. Pin connection (top view)

GND

OUTPUT

OUTPUT

ON-DELAY

SUPPLY VOLTAGE

N.C.

OUTPUT

OUTPUT N.C.

GND GND

Note: Output pins must be connected externally to the package to use all leads for the output

current (Pin 2, 3, 8 and 9 for PowerSO20 package).

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

GND1

OUTPUT STATUS

INPUT -

INPUT +

N.C.SUPPLY VOLTAGE

DIAGNOSTIC 2

DIAGNOSTIC 1

RSC

D95IN210B

OUT

RSC

DIAG1

DIAG2

PowerSO-20

Doc ID 4282 Rev 8 3/18

Block diagram and pin description L6370

1.1 Pin description

Table 2. Pin description

Pin N° Pin name Function

14 DIAG1

15 DIAG2

18 IN- Comparator non inverting input

17 IN+ Comparator inverting input

19 OUTSTATUS

1, 10,

11, 20

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

13 RSC Current limitation setting.

8, 9 OUTPUT High side output with built-in current limitation

5, 6 V

GND Ground

S

DIAGNOSTIC 1 output. This open drain reports the IC working
conditions. (See diagnostic truth Ta bl e 7 )

DIAGNOSTIC 2 output. This open drain reports the IC working
conditions. (See diagnostic truth Ta bl e 7 )

This current source output is capable of driving a LED to signal the
status of the output pin. The pin is active (source current) when the
output pin is considered high (See Figure 3)

Supply Voltage Input, the value of the supply voltage is monitored to
detect under voltage condition

4/18 Doc ID 4282 Rev 8

L6370 Electrical specifications

2 Electrical specifications

2.1 Absolute maximum ratings

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit

V

Supply voltage (TW< 10ms) 50 V

S

VS– VO

V

I

od

V

V

I

I

P

TOT

T

OP

T

STG

E

Supply to output differential voltage.
See also V

Externally forced voltage -0.3 to 7 V

od

Cl

internally limited V

Externally forced current ±1 mA

Input voltage -10 to VS+10 V

i

Differential input voltage 43 V

i

Input current 20 mA

i

Output current. see also ISC internally limited A

O

Power dissipation.
see also thermal characteristics.

Operating temperature range (T

) -25 to +85 °C

amb

internally limited W

Storage temperature -55 to 150 °C

Energy induct. load TJ= 85°C 1 J

I

2.2 Thermal data

Table 4. Thermal data

Symbol Description Value Unit

R

R

thJC

thJA

Thermal resistance junction to case Max. 1.5

Thermal resistance junction to ambient Max. -

°C/W

Doc ID 4282 Rev 8 5/18

Electrical specifications L6370

2.3 Electrical characteristics

(VS = 24V; 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

I

smin

V

I

q

sth1

sth2

sth3

I

sc

don

oslk

V

ol

V

cl

Supply voltage for valid
diagnostics

Supply voltage (operative) 9.5 24 35 V

s

Quiescent current
I

= Ios = 0

out

Undervoltage threshold 1

> 0.5mA; V

I

diag

V

il

V

ih

(See Figure 4), T
+85°C

= 1.5V 4 35 V

dg1

0.8
3

= 0 to

amb

8.599.5V

Undervoltage threshold 2 8 8.5 9 V

Supply voltage hysteresis 300 500 700 mV

Short circuit current

VS = 9.5 to 35V; RL= 2Ω 5kΩ<
RSC< 30kΩ

0< R

< 5kΩ 2.6 3.2 4 A

SC

= 2.0A, Tj = 25°C

I

out

Tj = 125°C

15/R

(kΩ)A

SC

200
320

Output voltage drop

= 2.5A, Tj = 25°C

I

out

T

j

= 125°C

250
400

Output leakage current Vi = Vil; Vo = 0V 500 μA

Low state out voltage Vi = Vil; RL = ∞ 0.8 1.5 V

Internal voltage clamp
(VS- VO)

IO = 1A
Single pulsed: Tp = 300 μs

48 53 58 V

1.4
4

280
440

350
550

mA

mV

mV

I

V

I

V

V

R

Open load detection current Vi = Vih; T

old

Common mode input voltage

id

range (operative)

Input bias current Vi = -7 to 15V; -In = 0V -250 250 μA

ib

Input threshold voltage V +In > V -In 0.8 1.4 2 V

ith

Input threshold hysteresis

iths

voltage

Diff. input resistance

id

= 18 to 35V -7 15 V

V

S

V +In > V -In 50 400 mV

0 < +In < +16V; -In = 0V

-7 < +In < 0V; -In = 0V

= 0 to +85 °C 1 3 6 mA

amb

V +In = V -In +Ii
0V < Vi < 5.5V -Ii

I

Input offset current

ilk

-In = GND +Ii
0V < V+In <5.5V -Ii -250

+In = GND +Ii
0V < V-In <5.5V -Ii

6/18 Doc ID 4282 Rev 8

400
150

-20

-75 -25

+10

-125

-100

-50

-30

-15

+20

+50

KΩ

μA