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TDE1708DFT
Intelligent power switch
Features

Low side or high side switch configuration 6V to 48V 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 +5V regulated aux. voltage High burst immunity 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 25ms (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.
DFN (4x4)
Description
The TDE1708DFT is an Integrated Power Switch with up to 48V 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 +5V supply can be used to supply external circuits (See also AN495).
Order codes
Part number TDE1708DFT Temp range, C -25C to +85C Package DFN(4x4) Packing Tape and reel
January 2007
Rev 3
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Contents
TDE1708DFT
Contents
1 2 Block and pin connection diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 2.2 2.3 2.4 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Dynamic information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Adjustable input hysteresis circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 5
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1 5.2 Foot print recommended . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 DFN (4x4) Mechanical data & package dimensions . . . . . . . . . . . . . . . . . . . 12
6
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
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TDE1708DFT
Block and pin connection diagrams
1
Block and pin connection diagrams
Figure 1. Block diagram
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Block and pin connection diagrams
TDE1708DFT
Figure 2.
Pin connection diagram (top view)
Table 1.
Pin functions
Pin No 1 2 3 4 5 6 7 8 Led driver High side output Delay capacitance source Ground Input Reg. voltage source Supply voltage Low side output Function
Note:
Lead frame can be connected to ground.
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TDE1708DFT
Electrical specifications
2
2.1
Electrical specifications
Thermal data
Table 2.
Symbol RthJA RthJC
Thermal data
Description Thermal resistance junction-ambient Thermal resistance junction-case Max. Max. Value 32(1) 1.2 Unit C/W C/W
1. Soldered to a 4 layer board with 4 vias in the pad.
2.2
Absolute maximum ratings
Table 3.
Symbol VS VS Io Vreg Vdelay Vo Vi TJ Tstg Ptot Ei Supply voltage Supply reverse voltage Output current Regulated voltage pin Delay cap. source pin Output diff. voltage Input voltage Junction operating temperature Storage temperature range Power dissipation Energy inductive load
Absolute maximum ratings
Parameter Value 50 50 internally limited 0 to 7 0 to 5 55 -10 to 50 Internally limited -55 to 150 internally limited 100 Unit V V A V V V V C C mW mJ
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Electrical specifications
TDE1708DFT
2.3
Electrical characteristics
Table 4.
Symbol Vs Isr Iq Io Vsat ISCLS ISCHS Vcl Iolk Vith Vihis Ilk Vreg Iscr Ireg Iold Vold Oldlk Idch Vdth TTSD
Electrical characteristics (VS = 24V ; TJ = - 25 to +85C unless otherwise specified).
Parameter Supply voltage Supply reverse current Quiescent current Output current Output voltage drop Short circuit current in Low side configuration Short circuit current in High side configuration Internal voltage clamp Output leakage Input voltage threshold Input threshold hysteresis Input current Regulated output voltage Short circuit regulated Output regulator current Current source sink led driver Voltage drop led driver LED driver (off) Leak. Del. cap. charge current Delay voltage trigger Thermal shutdown temperature TJ = 25C Vs = 35V Vs = 48V Output ON () Ios = 2mA () Vi < 2V; RL < 1K 2 4 4 180 2 3 1.2 Vi = 5V Ireg < 5mA 4.5 6 ICL = 10mA (Pin 2) Vi < 2V; Vo = 0 to Vs (Pin 8) 2 300 2 5 30 5 5.5 50 6 4 4 1.6 10 6 VSR = -48V Ireg = Iled = 0; Vi < 2V; VS = 6 to 48V Vs = 6V to 48V Io = 200mA 0.3 0.25 55 100 1 0.4 0.3 Test conditions Min 6 Typ Max 48 1.5 1.5 250 1.5 0.6 0.40 70 300 100 3 Unit V mA mA mA V A A V A A V mV A V mA mA mA mA V A A V C
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TDE1708DFT
Electrical specifications
2.4
Dynamic information
Table 5.
Symbol ton toff tdon td min
Dynamic information (VS = 24V ; TJ = 25C ; RL = 48).
Parameter Propagation turn on time Propagation turn off time Delayed turn on time / nF delay capacitor Minimum delayed ton Delay capacitor = 0 0.65 Test conditions Vi = 0 to 5V Min Typ 15 15 1 25 2 Max Unit s s ms s
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Application information
TDE1708DFT
3
Application information
The LED driver tells the output status. It can source or sink current (Iold typ = 3mA), according to the output configuration chosen. The thresholds, represented by the output comparator in the Block Diagram, are set at about 1.5V - 2V. For instance, in the High Side Load case of the Application Circuit, when the voltage on pin 8 (the output) differs from VCC less than 1.5V, the output is sensed in "OFF" state and the LED driver is disabled. If instead pin 8 differs from VCC more than 3V (the output comparator threshold value plus the drop voltage on the LED), then the output is sensed "ON" and the driver will force the current on the LED.
Figure 3.
Low side driver topology
Figure 4.
High side driver topology
TDE1708DFT
TDE1708DFT TDE1708DF
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TDE1708DFT
Application information
3.1
Adjustable input hysteresis circuit
The TDE1708DFT is a device realized in bipolar technology and therefore it has the usual problems of temperature compensation that such technology involves; despite all it maintains an input dynamics within 1V over industrial temperatures range. In all input voltage range it will guarantee a high impedance of 1M determining an input current about 2uA. Exploiting this input high impedance is possible connects a sensor directly on it and bypass the obstacle of active signal conditioning circuit using a voltage firm point as ground of sensor, the delay capacitor, connected on the pin 3, as low pass filter and capacitor on Vreg pin to minimize the noise on it and protect for errors the low-voltage internal circuits, according AN495. In Figure 5. the input external network is optimized for accepting both a sensor with ground connected to the body and a sensor with independent ground. In order to ground the body of the sensor , J1 has to be shorted , while J2 opened and connect the sensor on M3; in case of independent ground J1 must be opened, J2 shorted and the sensor connected on M4. DL1 indicate commutation status of the device output and C3 realize a simple output filtering in case is used an inductive load. With C2 about 10nF we obtain a good filtering and immunity from input voltage noise. C4 is 4,7nF according AN495. R2 is an optional resistor plugged only when the sensor needs to adapt its impedance with the input impedance of device. .
Figure 5.
Application circuit for adjustable input hysteresis
TDE1708DFT
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Package mechanical data
TDE1708DFT
4
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a Lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com
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TDE1708DFT
Package information
5
5.1
Figure 6.
Package information
Foot print recommended
Foot print
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Package information
TDE1708DFT
5.2
Table 6.
DFN (4x4) Mechanical data & package dimensions
Package dimensions
Dimensions Ref. Typ A A1 A3 b D D2 E E2 e L 0.90 0.02 0.20 0.30 4 3 4 2.20 0.80 0.50 0.40 0.60 0.23 3.90 2.82 3.90 0.38 4.10 3.23 4.10 2.30 Millimeters Min 0.80 0 Max 1 0.05
Figure 7.
Package dimension
Top view Bottom view
Sitting plane
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TDE1708DFT
Revision history
6
Revision history
Table 7.
Date 26-Jun-2006 31-Oct-2006 09-Jan-2007
Revision history
Revision 1 2 3 Initial release. Updated package in cover page, inserted low/high side ISC in Table 4. Updated ISCHS in Table 4 on page 6. Changes
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TDE1708DFT
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