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 Package Marking TLE 6365 G PG-DSO-8 6365G Data Sheet 1 Rev. 1.9, 2007-07-30 TLE 6365 Pin Configuration TLE 6365 G R 1 8 VS RO 2 7 BUO BUC 3 6 BDS GND 4 5 VCC AEP03319 .VSD Figure 1 Pin Configuration (top view) Table 1 Pin Definitions and Functions Pin No. Symbol Function 1 R Reference Input; an external resistor from this pin to GND determines the reference current and so the oscillator / switching frequency. 2 RO Reset Output; open drain output from reset comparator with an internal pull-up resistor 3 BUC Buck-Converter Compensation Input; output of internal error amplifier; for loop-compensation and therefore stability connect an external R-C-series combination to GND. 4 GND Ground; analog signal ground 5 VCC Output Voltage Input; feedback input (with integrated resistor divider) and logic supply input; external blocking capacitor necessary 7 BUO Buck Converter Output; source of the integrated power-DMOS 6 BDS Buck Driver Supply Input; voltage to drive the buck converter powerstage 8 VS Supply Voltage Input; buck converter input voltage; external blocking capacitor necessary. Data Sheet 2 Rev. 1.9, 2007-07-30 TLE 6365 Block Diagram VS 8 Biasing and VREF BUC 3 6 Buck Converter 7 BDS BUO TLE 6365 G 5 VInternal R 1 Reference Current Generator and Oscillator Undervoltage Reset Generator 2 VCC RO 4 GND AEA03315.VSD Figure 2 Data Sheet Block Diagram 3 Rev. 1.9, 2007-07-30 TLE 6365 Table 2 Absolute Maximum Ratings Parameter Symbol Limit Values Unit Remarks Min. Max. -0.3 46 V – -1 46 V – -0.3 48 V 0°C≤Tj≤150°C -0.3 47 V -40°C≤Tj<0°C Voltages Supply voltage Buck output voltage Buck driver supply voltage VS VBUO VBDS Buck compensation input voltage VBUC -0.3 6.8 V – Logic supply voltage VCC VRO VR -0.3 6.8 V – -0.3 6.8 V – -0.3 6.8 V – Reset output voltage Current reference voltage ESD-Protection (Human Body Model; R = 1.5 kΩ; C = 100 pF) All pins to GND VHBM -2 2 kV – Tj Tstg -40 150 °C – -50 150 °C – Temperatures Junction temperature Storage temperature Note: Stresses above those listed here may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Data Sheet 4 Rev. 1.9, 2007-07-30 TLE 6365 Table 3 Operating Range Parameter Supply voltage Supply voltage Supply voltage Supply voltage Symbol VS VS VS VS VBUO Buck driver supply voltage VBDS Buck output voltage Buck compensation input voltage VBUC VCC VRO Reset output voltage Current reference voltage VCREF Junction temperature Tj Logic supply voltage Limit Values Unit Remarks Min. Max. -0.3 40 V – 5 35 V 4.5 36 V VS increasing VS decreasing -0.3 4.5 V Buck-Converter OFF -0.6 40 V – -0.3 48 V 0°C≤Tj≤150°C -0.3 47 V -40°C≤Tj<0°C 0 3.0 V – 4.0 6.2 V – -0.3 VCC + 0.3 V – 0 1.23 V – -40 150 °C – – 180 K/W – Thermal Resistance Junction ambient Data Sheet Rthj-a 5 Rev. 1.9, 2007-07-30 TLE 6365 Table 4 Electrical Characteristics 8 V < VS < 35 V; 4.75 V < VCC < 5.25 V; -40 °C < Tj < 150 °C; RR = 47 kΩ; all voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified Parameter Symbol Limit Values Min. Typ. Max. Unit Test Condition Current Consumption Current consumption; see Figure 6 IS – 1.5 4 mA ICC = 0 mA Current consumption; see Figure 6 IS – 5 10 mA ICC = 400 mA Under- and Over-Voltage Lockout at VS UV ON voltage; buck conv. ON VSUVON 4.0 4.5 5.0 V VS increasing UV OFF voltage; buck conv. OFF VSUVOFF 3.5 4.0 4.5 V VS decreasing 0.2 0.5 1.0 V HY = ON - OFF UV Hysteresis voltage VSUVHY OV OFF voltage; buck conv. OFF VSOVOFF 34 37 40 V VS increasing OV ON voltage; buck conv. ON VSOVON 30 33 36 V VS decreasing OV Hysteresis voltage VSUVHY 1.5 4 10 V HY = OFF - ON Over-Voltage Lockout at VCC OV OFF voltage; buck conv. OFF VCCOVOFF 5.5 6.0 6.5 V VCC increasing OV ON voltage; buck conv. ON VCCOVON 5.25 5.75 6.25 V VCC decreasing OV Hysteresis voltage VCCOVHY 0.10 0.25 0.50 V HY = OFF - ON Data Sheet 6 Rev. 1.9, 2007-07-30 TLE 6365 Table 4 Electrical Characteristics (cont’d) 8 V < VS < 35 V; 4.75 V < VCC < 5.25 V; -40 °C < Tj < 150 °C; RR = 47 kΩ; all voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified Parameter Symbol Limit Values Min. Typ. Unit Test Condition Max. Buck-Converter; BUO, BDS, BUC and VCC Logic supply voltage VCC 4.9 – 5.1 V 1 mA < ICC < 400 mA; see Figure 6 Efficiency; see Figure 6 η – 85 – % Power-Stage ON resistance RBUON – 0.38 0.5 Ω Power-Stage ON resistance RBUON – – 1.0 Ω ICC = 400 mA; VS = 14 V Tj = 25 °C; IBUO = 0.6 A IBUO = 0.6 A Buck overcurrent threshold IBUOC 0.7 0.9 1.2 A – Input current on pin ICC – – 500 µA VCC = 5 V VBGS 5 7.2 10 V – VCC Buck Gate supply voltage; VBGS = VS - VBDS Reference Input; R (Oscillator; Timebase for Buck-Converter and Reset) Voltage on pin R Oscillator frequency Oscillator frequency Cycle time for reset timing Data Sheet VR fOSC fOSC tCYL – 1.4 – 85 95 105 RR = 100 kΩ kHz Tj = 25 °C 75 – 115 kHz – – 1 – ms 7 V tCYL = 100 / fOSC Rev. 1.9, 2007-07-30 TLE 6365 Table 4 Electrical Characteristics (cont’d) 8 V < VS < 35 V; 4.75 V < VCC < 5.25 V; -40 °C < Tj < 150 °C; RR = 47 kΩ; all voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified Parameter Symbol Limit Values Min. Typ. Max. Unit Test Condition Reset Generator; RO Reset threshold; VCC decreasing VRT 4.50 4.65 4.75 V VRO H to L or L to H transition; VRO remains low down to VCC > 1 V Reset low voltage VROL – 0.2 0.4 V Reset low voltage VROL – 0.2 0.4 V Reset high voltage VROH VCC - – VCC + V IROL = 1 mA; 2.5 V < VCC < VRT IROL = 0.2 mA; 1V < VCC < VRT IROH = 0 mA 0.1 0.1 Reset pull-up current Reset Reaction time Power-up reset delay time IRO tRR tRD – 240 – µA 10 40 90 µs – 128 – tCYL VCC < VRT VCC ≥ 4.8 V 0 V < VRO < 4 V Thermal Shutdown (Boost and Buck-Converter OFF) Thermal shutdown junction temperature TjSD 150 175 200 °C – Thermal switch-on junction temperature TjSO 120 – 170 °C – Temperature hysteresis ∆T – 30 – K – Data Sheet 8 Rev. 1.9, 2007-07-30 TLE 6365 Circuit Description Below some important sections of the TLE 6365 are described in more detail. Power On Reset In order to avoid any system failure, a sequence of several conditions has to be passed. In case of VCC power down (VCC < VRT for t > 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 t ON Delay Started RO H Invalid Invalid L Start-Up Invalid tRR tRD Power Stopped Normal t tRD Failed N Failed Normal AET03325.VSD Figure 3 Data Sheet Reset Function 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 11 Pin 1 R Vmin Vmax GND Error Amp. tr tf tr Oscillator 2.8 V VRef VCC 200 Ω RProt1 GND RVCC2 28 Ω RVCC1 22 Ω Pin 5 VCC BUC Pin 3 t GND = Vlow Ramp Vhigh tr tf tr t Clock Tj > 175°C L when PWM H when Comp. Error-Signal < Error-Ramp 1.2 V VthOV S R & & Q Q Error-FF NOR1 _ >1 = GND UV Comp. & NAND 2 S R 4V VthUV & & OC Comp. H = INV Q OFF 1 Q PWM-FF L when Overcurrent H when UV at VBOOST OFF when H Output Stage OFF when H OV Comp. H when OV at VCC Schmitt-Trigger 1 Error-Ramp Error-Signal GND 10.3 Ω RVCC4 39.7 Ω RVCC3 VCC RSense 18 mΩ H= ON Gate Driver Gate Driver Supply = VthOC 18 mV AEA03316.VSD BUO Pin 7 Power D-MOS BDS Pin 6 Pin 8 VS TLE 6365 Buck Converter Block Diagram Rev. 1.9, 2007-07-30 TLE 6365 VO Error Voltage and VError Vmax Vmin t OCLK H L PWM H L t I BUO I BUOC t I DBU t VBUO t VS VCC t Overcurrent Threshold Exceeded Load-Current Increasing with Time; Controlled by the Error Amp Controlled by the Overcurrent Comp AED02673_6365 Figure 5 Data Sheet Most Important Waveforms of the Buck Converter Circuit 12 Rev. 1.9, 2007-07-30 TLE 6365 Application Circuit t D1 VBatt CL + CS ZD1 36 V 10 µF 220 nF 8 VS Biasing and VREF BDS 6 CBOT 10 nF 3 BUC RCO 47 kΩ Buck Converter BUO 7 220 µH DBU TLE 6365 G CCO 470 nF Reference Current Generator and Oscillator RR 100 kΩ CBU1 CBU2 100 µF 220 nF + VCC VCC 5 VInternal 1 R LBU Undervoltage Reset Generator RO 2 Reset Output GND 4 Device Type Supplier Remarks D1 BAW78C Infineon 200 V; 1 A; SOT89 DBU SS14 - Schottky; 100 V; 1 A LBU B82476-A1224-M Epcos 220 µH; 0.8 A; 0.53 Ω LBU DO3316P-224 Coilcraft 220 µH; 0.8 A; 0.61 Ω AEA03310.VSD Figure 6 Data Sheet Application Circuit 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 Oscillator Frequency Deviation vs. Junction Temperature AED03017 95 AED03016 10 kHz η % ∆f OSC 90 Referred to f OSC at Tj = 25 ˚C 5 VCC = 5 V 85 0 I Load = 120 mA 80 -10 70 65 -5 80 mA 75 40 mA 5 15 25 -15 -50 -25 0 V 30 25 50 75 100 ˚C 150 VS Tj Feedback Voltage vs. Junction Temperature VCC 5.15 V Buck Overcurrent Threshold vs. Junction Temperature AED03356.VSD I OC 5.10 AED03018 1.4 A 1.3 5.05 IBUO = 400 mA 1.2 5.00 1.1 4.95 1 I BUOC (Buck-Converter) 4.90 0.9 4.85 4.80 -50 -25 0 0.8 -50 -25 0 25 50 75 100 °C 150 ˚C 150 Tj Tj Data Sheet 25 50 75 100 14 Rev. 1.9, 2007-07-30 TLE 6365 Current Consumption vs. Junction Temperature Oscillator Frequency vs. Resistor between R and GND AED02940 3 mA AED02982 1000 kHz fOSC I Boost 500 2.5 Boost ON Buck ON I BO boost = 0 mA I CC = 0 mA 2 200 @ Tj = 25 ˚C 100 1.5 50 1 20 0.5 -50 -25 0 10 25 50 75 100 ˚C 150 5 10 20 Tj RR Buck ON Resistance vs. Junction Temperature Efficiency Buck vs. Load η kΩ 1000 50 100 200 AED02942 90 % AED03355.VSD 1000 RON mΩ 800 85 RBUON @ IBUO = 600 mA RT, HT 700 CT 80 600 500 400 75 300 200 70 100 65 50 150 mA 0 -50 -25 0 250 Tj I LOAD Data Sheet 25 50 75 100 °C 150 15 Rev. 1.9, 2007-07-30 TLE 6365 Package Outlines 1.27 0.1 0.41 +0.1 -0.06 0.19 +0.0 6 B 0.64 ±0.25 0.2 M A B 8x 8 5 Index Marking 1 4 5 -0.21) 8° MAX. 4 -0.21) 1.75 MAX. 0.175 ±0.07 (1.45) 0.35 x 45° 6 ±0.2 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. Dimensions in mm SMD = Surface Mounted Device Data Sheet 16 Rev. 1.9, 2007-07-30 TLE 6365 Revision History Version Date Rev. 1.9 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 Changes 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.