ST TDE1708DFT User Manual

TDE1708DFT

Intelligent power switch

Features

Low side or high side switch configuration

6 V to 48 V supply voltage range

Overload and short circuit protections

Internal voltage clamping

Supply and output reversal protection

Thermal shutdown

GND and VS open wire protection

Adjustable delay at switch on

Indicator status led driver

+5 V regulated aux. voltage

High burst immunity

Description

The TDE1708DFT is an integrated power switch with up to 48 V power supply capability. Two output configurations are possible:

Load to GND (high side mode)

Load to VS (low side mode)

Especially dedicated to proximity detectors, its internal +5 V supply can be used to supply external circuits (See also AN495).

Table 1. Device summary

DFN (4x4)

A signal is internally generated to block the In signal, and prevent activation of the output switch, as long as an abnormal condition is detected. The power-on transition, as well as the chip over temperature and the output overcurrent, concur to the generation of such signal. A minimum delay of 25 ms (Typ. value) is added to the trailing edge of such signal to ensure that a stable normal situation is present when the signal disappears. The delay (of the disappearance of the block signal; no delay at its on set) can be further increased connecting a capacitor between pin3 and ground. It can drive resistive or inductive loads.

Order code

Temp. range, °C

Package

Packing

 

 

 

 

TDE1708DFT

-25 °C to +85 °C

DFN (4x4)

Tape and reel

 

 

 

 

February 2009

Rev 4

1/14

www.st.com

Contents

TDE1708DFT

 

 

Contents

1

Block and pin connection diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 3

2

Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5

 

2.1

Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5

 

2.2

Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5

 

2.3

Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6

 

2.4

Dynamic information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7

3

Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8

 

3.1

Adjustable input hysteresis circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9

4

Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10

 

4.1

Foot print recommended . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10

 

4.2

DFN (4x4) mechanical data and package dimensions . . . . . . . . . . . . . . .

11

5

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13

2/14

ST TDE1708DFT User Manual

TDE1708DFT

Block and pin connection diagrams

 

 

1 Block and pin connection diagrams

Figure 1. Block diagram

3/14

Block and pin connection diagrams

TDE1708DFT

 

 

 

 

Figure 2. Pin connection diagram (top view)

 

 

 

 

 

 

 

 

Table 2.

Pin functions

 

 

Pin No

Function

 

 

 

 

 

 

1

Led driver

 

 

 

 

 

 

2

High side output

 

 

 

 

 

 

3

Delay capacitance source

 

 

 

 

 

 

4

Ground

 

 

 

 

 

 

5

Input

 

 

 

 

 

 

6

Reg. voltage source

 

 

 

 

 

 

7

Supply voltage

 

 

 

 

 

 

8

Low side output

 

 

 

Note:

Lead frame can be connected to ground.

4/14

TDE1708DFT

Electrical specifications

 

 

2 Electrical specifications

2.1Thermal data

Table 3.

Thermal data

 

 

Symbol

Description

Value

Unit

 

 

 

 

RthJA

Thermal resistance junction-ambient. (max)

32(1)

°C/W

RthJC

Thermal resistance junction-case. (max)

1.2

°C/W

1. Soldered to a 4 layer board with 4 vias in the pad.

2.2Absolute maximum ratings

Table 4.

Absolute maximum ratings

 

 

Symbol

Parameter

Value

Unit

 

 

 

 

VS

Supply voltage

50

V

VS

Supply reverse voltage

50

V

Io

Output current

internally limited

A

Vreg

Regulated voltage pin

0 to 7

V

Vdelay

Delay cap. source pin

0 to 5

V

Vo

Output dif. voltage

55

V

Vi

Input voltage

-10 to 50

V

TJ

Junction operating temperature

Internally limited

°C

Tstg

Storage temperature range

-55 to 150

°C

Ptot

Power dissipation

internally limited

mW

Ei

Energy inductive load

100

mJ

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