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 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). 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 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. Order codes Part number Temp range, °C Package Packing TDE1708DFT -25°C to +85°C DFN(4x4) Tape and reel January 2007 Rev 3 1/14 www.st.com 14 TDE1708DFT Contents Contents 1 Block and pin connection diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 2.1 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.4 Dynamic information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.1 Adjustable input hysteresis circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6 2/14 5.1 Foot print recommended . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5.2 DFN (4x4) Mechanical data & package dimensions . . . . . . . . . . . . . . . . . . . 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 TDE1708DFT 1 Block and pin connection diagrams Block and pin connection diagrams Figure 1. Block diagram 3/14 TDE1708DFT Block and pin connection diagrams Figure 2. Pin connection diagram (top view) Table 1. Pin functions Pin No Note: 4/14 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 Lead frame can be connected to ground. TDE1708DFT Electrical specifications 2 Electrical specifications 2.1 Thermal data Table 2. 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. 2.2 Absolute maximum ratings Table 3. 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 55 V -10 to 50 V Internally limited °C -55 to 150 °C internally limited mW 100 mJ Vo Output diff. voltage Vi Input voltage TJ Junction operating temperature Tstg Storage temperature range Ptot Power dissipation Ei Energy inductive load 5/14 TDE1708DFT Electrical specifications 2.3 Electrical characteristics Table 4. Symbol Parameter Test conditions Vs Supply voltage Isr Supply reverse current Iq Quiescent current Io Output current Vs = 6V to 48V Output voltage drop Io = 200mA Vsat Min Typ Max Unit 48 V 1.5 mA 1.5 mA 250 mA 1 1.5 V 6 VSR = –48V Ireg = Iled = 0; Vi < 2V; VS = 6 to 48V ISCLS Short circuit current in Low side configuration 0.3 0.4 0.6 A ISCHS Short circuit current in High side configuration 0.25 0.3 0.40 A 70 V 300 100 µA µA 3 V Vcl Internal voltage clamp ICL = 10mA Iolk Output leakage (Pin 2) Vi < 2V; Vo = 0 to Vs (Pin 8) Vith Input voltage threshold Vihis Input threshold hysteresis Ilk 6/14 Electrical characteristics (VS = 24V ; TJ = - 25 to +85°C unless otherwise specified). 300 Vi = 5V Vreg Regulated output voltage Ireg < 5mA Iscr Short circuit regulated Ireg Output regulator current Iold Current source sink led driver Output ON (±) Vold Voltage drop led driver Ios = 2mA (±) Oldlk LED driver (off) Leak. Vi < 2V; RL < 1KΩ Del. cap. charge current Vdth Delay voltage trigger TTSD Thermal shutdown temperature 100 2 Input current Idch 55 2 5 µA 4.5 5 5.5 V 6 30 50 mA 6 4 mA mA 3 4 mA 1.2 1.6 V 10 µA 6 µA Vs = 35V Vs = 48V 2 2 TJ = 25°C mV 4 4 V 180 °C TDE1708DFT 2.4 Electrical specifications Dynamic information Table 5. Symbol Dynamic information (VS = 24V ; TJ = 25°C ; RL = 48Ω). Parameter ton Propagation turn on time toff Propagation turn off time tdon Delayed turn on time / nF delay capacitor td min Minimum delayed ton Delay capacitor = 0 Test conditions Min Vi = 0 to 5V 0.65 Typ Max Unit 15 µs 15 µs 1 25 2 ms µs 7/14 TDE1708DFT Application information 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 TDE1708DFT 8/14 Figure 4. High side driver topology TDE1708DFT TDE1708DF TDE1708DFT 3.1 Application information 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 1MΩ 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 9/14 Package mechanical data 4 TDE1708DFT Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® 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 10/14 TDE1708DFT 5 Package information 5.1 Foot print recommended Figure 6. Package information Foot print 11/14 TDE1708DFT Package information 5.2 Table 6. DFN (4x4) Mechanical data & package dimensions Package dimensions Dimensions Ref. Figure 7. Millimeters Typ Min Max A 0.90 0.80 1 A1 0.02 0 0.05 A3 0.20 b 0.30 0.23 0.38 D 4 3.90 4.10 D2 3 2.82 3.23 E 4 3.90 4.10 E2 2.20 e 0.80 L 0.50 2.30 0.40 Package dimension Top view Bottom view Sitting plane 12/14 0.60 TDE1708DFT 6 Revision history Revision history Table 7. Revision history Date Revision Changes 26-Jun-2006 1 Initial release. 31-Oct-2006 2 Updated package in cover page, inserted low/high side ISC in Table 4. 09-Jan-2007 3 Updated ISCHS in Table 4 on page 6. 13/14 TDE1708DFT Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. 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