TLE4278G Infineon Technologies, TLE4278G Datasheet

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Low Drop Fixed Voltage Regulator Features • Output voltage tolerance • Very low current consumption • Separated reset and watchdog output • Low-drop voltage • Watchdog • Adjustable watchdog activating threshold • Adjustable reset threshold • Overtemperature protection • ...

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The watchdog function monitors the microcontroller, including time base failures. In case of a missing rising edge within a certain pulse repetition time the watchdog output is set to LOW. Programming of the max. repetition time can be done easily ...

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Figure 1 Pin Configuration (top view) Table 1 Pin Definitions and Functions Pin Symbol Function 1 WO Watchdog Output; the open collector output is connected to the 5 V output via an integrated resistor WADJ ...

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V Temperature Sensor Bandgap Reference 3-5, 10-12 GND Figure 2 Block Diagram Data Sheet Protection Circuit Reset Generator Control Amplifier Watchdog 2 WADJ 4 TLE 4278 RADJ ...

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Table 2 Absolute Maximum Ratings T = -40 to 150 C j Parameter Input Voltage I Voltage Current Output Voltage Q Voltage Current Reset Output RO Voltage Current Reset Delay D Voltage Current Reset Switching Threshold Adjust RADJ Voltage Current ...

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Table 2 Absolute Maximum Ratings (cont’ -40 to 150 C j Parameter Temperatures Junction temperature Storage temperature Note: ESD protection according to MIL Std. 883: 2 kV. Maximum ratings are absolute ratings; exceeding any one of these values ...

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Table 4 Electrical Characteristics 13 Parameter Symbol V Output voltage V Output voltage I Output current limiting I Current consumption Current consumption I ...

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Table 4 Electrical Characteristics (cont’ 13 Parameter Symbol V Upper timing threshold V Lower reset timing threshold t Delay time t Reset reaction time Watchdog V Activating threshold I Current ratio Slew ...

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C 1 1000 WADJ Outside the control range DR O Figure 3 Test Circuit Data Sheet 470 nF WO TLE 4278 G 1 WADJ WADJ ...

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Application Information Input, Output C The input capacitors and I1 a resistor of approx. 1 capacitance can be damped. To stabilize the regulation circuit the output capacitor necessary. Stability is guaranteed at values operating temperature range. V +12 V 470 ...

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Reset Timing The power-on reset delay time is defined by the charging time of an external capacitor C which can be calculated as follows D,c Definitions: C • = delay ...

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Reset Switching Threshold The present default value is 4.65 V. When using the TLE 4278 the reset threshold can V be set to 3.5 V < < 4 connecting an external voltage divider to pin RADJ. The Q,rt ...

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Watchdog Activating The calculation of the external resistor which adjusts the watchdog switch off threshold can be done by Equation WADJ WADJ,th Q WADJ Definitions: V • = switch off threshold, typical 1.35 ...

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Watchdog Timing The frequency of the watchdog pulses has to be higher than the minimum pulse sequence which is set by the external reset delay capacitor according to the formulas given in The watchdog output is internally connected to the ...

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Table 5 Hints for Unused Pins Symbol Function RO Reset output D Reset delay RADJ Reset switching threshold adjust WI Watchdog input WO Watchdog output WADJ Watchdog adjust Data Sheet Connect to open open or to output Q GND GND ...

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V Drop Voltage versus dr I Output Current 700 600 500 400 T = 125 C j 300 200 100 100 150 I Current Consumption V versus Input Voltage ...

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I Charge Current and Discharge D,wc I Current versus Temperature Output Voltage ...

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Package Outlines 1.27 +0.1 0.41 -0.06 Index Marking 1) Does not include plastic or metal protrusion of 0.15 max. per side Figure 9 PG-DSO-14-30 (Plastic Dual Small Outline) (RoHS compliant) Green Product To meet the world-wide customer requirements for environmentally ...

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TLE 4278 G Revision History: Previous Version: Page Subjects (major changes since last revision) general Updated Infineon logo #1 Added “AEC” and “Green” logo #1 Added “Green Product” and “AEC qualified” to the feature list #1 Updated Package Names to ...

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... Infineon Technologies Office. Infineon Technologies Components may only be used in life-support devices or systems with the express written approval of Infineon Technologies failure of such components can reasonably be expected to cause the failure of that life-support device or system affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body support and/or maintain and sustain and/or protect human life ...