TLE6365

Step Down Voltage Regulator with Reset TLE 6365 Features • • • • • • • • • • • • Step down converter Supply Over- and Under-Voltage-Lockout Low Output voltage tolerance Output Overvoltage Lockout Output Under-Voltage-Reset with delay Overtemperature Shutdown Wide Ambient operation range -40 °C to 125 °C Wide Supply voltage operation range Very low current consumption Very small PG-DSO-8 SMD package Green Product (RoHS compliant) AEC Qualified P/PG-DSO-8-3, -6, -7, -8, -9 Functional Description The TLE 6365 G is a power supply circuit especially designed for automotive applications. The device is based on Infineon’s power technology SPT® which allows bipolar and CMOS control circuitry to be integrated with DMOS power devices on the same monolithic circuitry. The TLE 6365 G contains a buck converter and a power on reset feature to start up the system The very small PG-DSO-8 SMD package meets the application requirements. It delivers a precise 5 V fully short circuit protected output voltage. Furthermore, the build-in features like under- and overvoltage lockout for supply- and output-voltage and the overtemperature shutdown feature increase the reliability of the TLE 6365 G supply system. Type TLE 6365 G Data Sheet Package PG-DSO-8 1 Marking 6365G Rev. 1.9, 2007-07-30 TLE 6365 Pin Configuration TLE 6365 G R RO BUC GND 1 2 3 4 8 7 6 5 AEP03319 .VSD VS BUO BDS VCC Figure 1 Table 1 Pin No. 1 R Pin Configuration (top view) Pin Definitions and Functions Symbol Function Reference Input; an external resistor from this pin to GND determines the reference current and so the oscillator / switching frequency. Reset Output; open drain output from reset comparator with an internal pull-up resistor Buck-Converter Compensation Input; output of internal error amplifier; for loop-compensation and therefore stability connect an external R-C-series combination to GND. Ground; analog signal ground Output Voltage Input; feedback input (with integrated resistor divider) and logic supply input; external blocking capacitor necessary Buck Converter Output; source of the integrated power-DMOS Buck Driver Supply Input; voltage to drive the buck converter powerstage Supply Voltage Input; buck converter input voltage; external blocking capacitor necessary. 2 3 RO BUC 4 5 GND VCC 7 6 8 BUO BDS VS Data Sheet 2 Rev. 1.9, 2007-07-30 TLE 6365 Block Diagram VS 8 Biasing and VREF 3 Buck Converter TLE 6365 G 5 6 BDS BUC 7 BUO VInternal 1 Reference Current Generator and Oscillator Undervoltage Reset Generator 4 GND 2 VCC R RO AEA03315.VSD Figure 2 Block Diagram Data Sheet 3 Rev. 1.9, 2007-07-30 TLE 6365 Table 2 Parameter Voltages Absolute Maximum Ratings Symbol Limit Values Min. Max. 46 46 48 47 6.8 6.8 6.8 6.8 2 150 150 V V V V V V V V kV °C °C – – 0°C≤Tj≤150°C -40°C≤Tj tRR) a logic LOW signal is generated at the pin RO to reset an external microcontroller. When the level of VCC reaches the reset threshold VRT, the signal at RO remains LOW for the Power-up reset delay time tRD before switching to HIGH. If VCC drops below the reset threshold VRT for a time extending the reset reaction time tRR, the reset circuit is activated and a power down sequence of period tRD is initiated. The reset reaction time tRR avoids wrong triggering caused by short “glitches” on the VCC-line. < tRR < tRD VCC VPG VRT Typ. 4.70 V Typ. 4.65 V 1V Start Up ON Delay ON Delay Started Invalid Invalid ON Delay Stopped Invalid t RO H L tRD Power Start-Up Normal tRR Failed N Failed tRD Normal t AET03325.VSD Figure 3 Reset Function Data Sheet 9 Rev. 1.9, 2007-07-30 TLE 6365 Buck Converter A stabilized logic supply voltage (typ. 5 V) for general purpose is realized in the system by a buck converter. An external buck-inductance LBU is PWM switched by a high side DMOS power transistor with the programmed frequency (pin R). The buck converter uses the temperature compensated bandgap reference voltage (typ. 2.8 V) for its regulation loop. This reference voltage is connected to the non-inverting input of the error amplifier and an internal voltage divider supplies the inverting input. Therefore the output voltage VCC is fixed due to the internal resistor ratio to typ. 5.0 V. The output of the error amplifier goes to the inverting input of the PWM comparator as well as to the buck compensation output BUC. When the error amplifier output voltage exceeds the sawtooth voltage the output power MOS-transistor is switched on. So the duration of the output transistor conduction phase depends on the VCC level. A logic signal PWM with variable pulse width is generated. External loop compensation is required for converter stability, and is formed by connecting a compensation resistor-capacitor series-network (RBUC, CBUC) between pin BUC and GND. In the case of overload or short-circuit at VCC (the output current exceeds the buck overcurrent threshold IBUOC) the DMOS output transistor is switched off by the overcurrent comparator immediately. In order to protect the VCC input as well as the external load against catastrophic failures, an overvoltage protection is provided which switches off the output transistor as soon as the voltage at pin VCC exceeds the internal fixed overvoltage threshold VCCOVOFF = typ. 6.0 V. Also a battery undervoltage protection is implemented in the TLE 6365 to avoid wrong operation of the following supplied devices, the typical threshold when decreasing the battery voltage is at VSUVOFF = typ. 4.0 V. Data Sheet 10 Rev. 1.9, 2007-07-30 Figure 4 Data Sheet VCC OV Comp. H when OV at VCC H when UV at VBOOST = 4V GND L when Overcurrent NOR1 _ >1 39.7 Ω RVCC3 UV Comp. 10.3 Ω 1.2 V GND = GND RVCC4 VthOV VthUV OC Comp. 18 mV = 18 mΩ VthOC VS RSense Pin 8 BUC Pin 3 RProt1 VCC R & PWM H when Comp. Error-Signal < Error-Ramp Output Stage OFF when H R & Q OFF when H & Q S & Q NAND 2 & Error-FF L when PWM-FF 200 Ω BDS Pin 6 Gate Driver Supply Pin 5 Buck Converter Block Diagram 11 Tj > 175°C Schmitt-Trigger 1 S Clock VCC RVCC1 22 Ω Error Amp. Error-Signal H = INV Q OFF 1 H= ON Gate Driver Error-Ramp Power D-MOS BUO Pin 7 RVCC2 28 Ω 2.8 V VRef GND GND R Vlow Oscillator Pin 1 Vmax Vmin Ramp Vhigh tr tf tr t t tr tf tr AEA03316.VSD TLE 6365 Rev. 1.9, 2007-07-30 TLE 6365 VO and Error Voltage VError Vmax Vmin OCLK H L PWM H L t t t I BUO I BUOC I DBU t VBUO VS t VCC t Overcurrent Threshold Exceeded Load-Current Increasing with Time; Controlled by the Error Amp Controlled by the Overcurrent Comp AED02673_6365 Figure 5 Most Important Waveforms of the Buck Converter Circuit Data Sheet 12 Rev. 1.9, 2007-07-30 TLE 6365 Application Circuit t D1 VBatt 10 µF CL + ZD1 36 V 8 CS 220 nF VS Biasing and VREF 3 BUC Buck Converter TLE 6365 G BDS 6 CBOT 10 nF BUO 7 LBU 220 µH DBU CBU1 + 100 µF 220 nF CBU2 RCO 47 kΩ 470 nF VCC CCO VInternal 1R Reference Current Generator and Oscillator Undervoltage Reset Generator GND 4 VCC 5 RO 2 Reset Output 100 kΩ RR Device D1 DBU Type BAW78C SS14 B82476-A1224-M DO3316P-224 Supplier Infineon Epcos Coilcraft Remarks 200 V; 1 A; SOT89 Schottky; 100 V; 1 A 220 µH; 0.8 A; 0.53 Ω 220 µH; 0.8 A; 0.61 Ω AEA03310.VSD LBU LBU Figure 6 Application Circuit Data Sheet 13 Rev. 1.9, 2007-07-30 TLE 6365 Diagrams: Oscillator and Boost/Buck-Converter Performance In the following the behaviour of the Boost/Buck-converter and the oscillator is shown. Efficiency Buck vs. Boost Voltage 95 AED03017 Oscillator Frequency Deviation vs. Junction Temperature ∆f OSC VCC = 5 V 10 kHz 5 Referred to f OSC at Tj = 25 ˚C AED03016 η% 90 85 0 80 I Load = 120 mA 80 mA -5 75 70 -10 40 mA -15 -50 -25 0 65 5 15 25 V 30 25 50 75 100 ˚C 150 VS Tj Feedback Voltage vs. Junction Temperature VCC 5.15 V 5.10 5.05 AED03356.VSD Buck Overcurrent Threshold vs. Junction Temperature 1.4 A 1.3 AED03018 I OC IBUO = 400 mA 5.00 1.2 1.1 4.95 1 4.90 4.85 4.80 -50 -25 0 I BUOC (Buck-Converter) 0.9 0.8 -50 -25 0 25 50 75 100 °C 150 25 50 75 100 ˚C 150 Tj Tj Data Sheet 14 Rev. 1.9, 2007-07-30 TLE 6365 Current Consumption vs. Junction Temperature 3 mA 2.5 Boost ON Buck ON I BO boost = 0 mA I CC = 0 mA AED02940 Oscillator Frequency vs. Resistor between R and GND 1000 kHz 500 AED02982 I Boost fOSC 200 @ Tj = 25 ˚C 100 2 1.5 50 1 20 0.5 -50 -25 0 25 50 75 100 ˚C 150 10 5 10 20 50 100 200 kΩ 1000 Tj RR Efficiency Buck vs. Load 90 % 85 RT, HT AED02942 Buck ON Resistance vs. Junction Temperature 1000 AED03355.VSD η RON mΩ 800 700 RBUON @ IBUO = 600 mA 80 CT 600 500 75 400 300 70 200 100 65 50 150 mA 250 0 -50 -25 0 25 50 75 100 °C 150 I LOAD Tj Data Sheet 15 Rev. 1.9, 2007-07-30 TLE 6365 Package Outlines 0.35 x 45° 1.75 MAX. 0.175 ±0.07 (1.45) 4 -0.21) 0.19 +0.0 6 1.27 0.41 +0.1 -0.06 8 5 0.1 B 6 ±0.2 0.64 ±0.25 0.2 M A B 8x Index Marking 1 4 5 -0.21) A 1) Does not include plastic or metal protrusion of 0.15 max. per side 2) Lead width can be 0.61 max. in dambar area GPS01229 Figure 7 PG-DSO-8-16 (Plastic Dual Small Outline) Green Product (RoHS compliant) To meet the world-wide customer requirements for environmentally friendly products and to be compliant with government regulations the device is available as a green product. Green products are RoHS-Compliant (i.e Pb-free finish on leads and suitable for Pb-free soldering according to IPC/JEDEC J-STD-020). You can find all of our packages, sorts of packing and others in our Infineon Internet Page “Products”: http://www.infineon.com/products. SMD = Surface Mounted Device Data Sheet 16 Dimensions in mm Rev. 1.9, 2007-07-30 8° MAX. TLE 6365 Revision History Version Rev. 1.9 Date Changes 2007-07-30 Initial version of RoHS-compliant derivate of TLE 6365 Page 1: AEC certified statement added Page 1 and Page 16:RoHS compliance statement and Green product feature added Page 1 and Page 16: Package changed to RoHS compliant version Legal Disclaimer and Infineon Logo updated Data Sheet 17 Rev. 1.9, 2007-07-30 Edition 2007-07-30 Published by Infineon Technologies AG 81726 Munich, Germany © 2007 Infineon Technologies AG All Rights Reserved. Legal Disclaimer The information given in this document shall in no event be regarded as a guarantee of conditions or characteristics. With respect to any examples or hints given herein, any typical values stated herein and/or any information regarding the application of the device, Infineon Technologies hereby disclaims any and all warranties and liabilities of any kind, including without limitation, warranties of non-infringement of intellectual property rights of any third party. Information For further information on technology, delivery terms and conditions and prices, please contact the nearest Infineon Technologies Office (www.infineon.com). Warnings Due to technical requirements, components may contain dangerous substances. For information on the types in question, please contact the nearest Infineon Technologies Office. Infineon Technologies components may be used in life-support devices or systems only with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered.