TLE6363

Multifunctional Voltage Regulator and Watchdog TLE 6363 Data Sheet Overview Features • • • • • • • • • • • • • Step up converter (Boost Voltage) Boost Over- and Under-Voltage-Lockout Step down converter (Logic Voltage) 2% output voltage tolerance Logic Over- and Under-Voltage-Lockout Overtemperature Shutdown Power ON/OFF reset generator Digital window watchdog System Enable Output Ambient operation temperature range – 40 ° C to 125 ° C Wide Supply voltage operation range Very low current consumption Very small P-DSO-14-2 SMD package Ordering Code Q67006-A9601 Package P-DSO-14-2 P-DSO-14-2 Type TLE 6363 G Functional Description General The TLE 6363 G is a multifunctional power supply circuit especially designed for automotive applications. It delivers a programmable step up voltage (Boost) and a precise 5 V fully short circuit protected output voltage (Buck). The TLE 6363 G contains a power on reset feature to start up the system, an integrated digital window watchdog to monitor the connected microcontroller and a system enable output to indicate the microcontroller window watchdog faults. 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 very small P-DSO-14-2 SMD packages meet the application requirements. Data Sheet Rev. 1.2 1 2003-06-02 TLE 6363 Furthermore, the build-in features like under- and overvoltage lockout for boost- and buck-voltage and the overtemperature shutdown feature increase the reliability of the TLE 6363 G supply system. Pin Definitions and Functions Pin No. SO-14 1 2 3 4 5 6 Symbol Function R RO WDI GND SEN BUC Reference Input; an external resistor from this pin to GND determines the reference current and the oscillator frequency Reset Output; open drain output from reset comparator with an internal pull up resistor Watchdog Input; input for the watchdog control signal from the controller Ground; analog signal ground System Enable Output; open drain output from Watchdog fail-circuit with an internal pull up resistor Buck-Converter Compensation Input; output of internal error amplifier; for loop-compensation connect an external R-C-series combination to GND Supply Voltage Output; buck converter output; external blocking capacitor necessary Buck Converter Output; source of the integrated power-DMOS Boost Converter Input; input supply voltage of the IC; coming from the boost converter output voltage; buck converter input voltage Buck Driver Supply Input; voltage to drive the buck converter powerstage Boost Status Output; open drain output from boost PWM comparator Boost Converter Feedback Input; connect boost voltage divider to this pin; internal reference is the boost feedback threshold 7 8 9 VCC BUO VBOOST 10 11 12 BDS OVL BOFB VBOFBTH 13 14 BOGND Boost-Ground; power signal ground; source of boost converter power-DMOS BOI Boost Converter Input; drain of the integrated buck converter power-DMOS Data Sheet Rev. 1.2 2 2003-06-02 TLE 6363 Pin Configuration R RO WDI GND SEN BUC VCC 1 2 3 4 5 6 7 14 13 12 11 10 9 8 AEP02960 BOI BOGND BOFB OVL BDS VBoost BUO Figure 1 Pin Configuration (top view) Data Sheet Rev. 1.2 3 2003-06-02 TLE 6363 Block Diagram TLE 6363 G BOFB 12 14 Boost Converter BOI BOGND BDS 13 10 Biasing VBoost VREF 9 BUC 6 Buck Converter VBOOST BUO 8 7 VInternal 5 Reference Current Generator and Oscillator Reset, Window Watchdog and System Enable VCC SEN 3 R 1 WDI 2 RO 11 4 GND OVL AEB03008 Figure 2 Block Diagram Data Sheet Rev. 1.2 4 2003-06-02 TLE 6363 Absolute Maximum Ratings Parameter Symbol Limit Values min. Voltages Boost input voltage Boost output voltage Boost feedback voltage Buck output voltage Buck driver supply voltage Buck compensation input voltage Logic supply voltage Reset output voltage System Enable output voltage Current reference voltage Watchdog input voltage OVL output voltage max. Unit Remarks VBOI VBOOST VBOFB VBUO VBDS VBUC VCC VRO VSEN VR VWDI VOVL – 0.3 – 0.3 – 0.3 –1 – 0.3 – 0.3 – 0.3 – 0.3 – 0.3 – 0.3 – 0.3 – 0.3 46 46 46 46 48 6.8 6.8 6.8 6.8 6.8 6.8 6.8 V V V V V V V V V V V V – – – – – – – – – – – – ESD-Protection (Human Body Model; R = 1.5 kΩ; C = 100 pF) All pins to GND Temperatures Junction temperature Storage temperature VHBM –2 2 kV – Tj Tstg – 40 – 50 150 150 °C °C – – 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 Rev. 1.2 5 2003-06-02 TLE 6363 Operating Range Parameter Boost input voltage Boost input voltage; (normal operation) Boost input voltage; (normal operation) Boost input voltage Symbol Limit Values min. max. 40 35 36 4.5 V V V V – – 0.3 5 4.5 – 0.3 Unit Remarks VBOI VBOOST VBOOST VBOOST VBOOST increasing VBOOST decreasing Boost- and Buck-Converter OFF – – – – – – – – – – VBOFB VBUO Buck output voltage Buck driver supply voltage VBDS Buck compensation input VBUC Boost feedback voltage voltage Logic supply voltage Reset output voltage System Enable output voltage Watchdog input voltage Current reference voltage Junction temperature Thermal Resistance Junction ambient 0 – 0.6 – 0.3 0 4.00 – 0.3 – 0.3 0 0 – 40 3.0 40 48 3.0 6.25 V V V V V VCC VRO VSEN VWDI VR Tj VCC + 0.3 V VCC + 0.3 V VCC + 0.3 V 3.0 150 V °C Rthj-a – 120 K/W – Note: In the operating range, the functions given in the circuit description are fulfilled. Data Sheet Rev. 1.2 6 2003-06-02 TLE 6363 Electrical Characteristics 8 V < VBoost < 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 pin; unless otherwise specified. Parameter Symbol Limit Values min. Current Consumption Current consumption; see application circuit Current consumption; see application circuit typ. max. Unit Test Conditions IBoost IBoost – – 1.5 5 4 10 ICC = 0 mA; IBoLoad = 0 mA mA ICC = 200 mA; IBoLoad = 50 mA mA Under- and Over-Voltage Lockout at VBoost UV ON voltage; boost and buck conv. ON UV OFF voltage; boost and buck conv. OFF UV Hysteresis voltage OV OFF voltage; boost conv. OFF OV ON voltage; boost conv. ON OV Hysteresis voltage VBOUVON 4.0 VBOUVOFF 3.5 VBOUVHY 0.2 VBOOVOFF 34 VBOOVON 30 VBOUVHY 1.5 4.5 4.0 0.5 37 33 4 5.0 4.5 1.0 40 36 10 V V V V V V VBOOST increasing; VBOOST decreasing HY = ON - OFF VBOOST increasing VBOOST decreasing HY = OFF - ON Over-Voltage Lockout at VCC OV OFF voltage; buck conv. OFF OV ON voltage; buck conv. ON OV Hysteresis voltage VBUOVOFF 5.5 VBUOVON 5.25 VBUOVHY 0.10 6.0 5.75 0.25 6.5 6.25 0.50 V V V VCC increasing VCC decreasing HY = OFF - ON Data Sheet Rev. 1.2 7 2003-06-02 TLE 6363 Electrical Characteristics (cont’d) 8 V < VBoost < 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 pin; unless otherwise specified. Parameter Symbol Limit Values min. Boost-Converter; BOI, BOFB and VBOOST Boost voltage; see application circuit Boost Voltage; see application circuit typ. max. Unit Test Conditions VBOOST 24.0 27.5 31.0 V 5 mA < IBoost < 100 mA; Tj = 25 ° C 8 V < VBatt < 16 V 5 mA < IBoost < 100 mA; 8 V < VBatt < 16 V VBOOST 23 – 32 V Efficiency; see. appl. circuit η Power-Stage ON resistance Power-Stage ON resistance – – – 1.0 2.55 –2 80 0.6 – 1.3 2.7 – 0.75 1.4 1.8 2.85 % Ω Ω A V µA RBOON RBOON IBoost = 100 mA Tj = 25 ° C; IBOI = 1 A IBOI = 1 A – Boost overcurrent threshold IBOOC Feedback threshold voltage VBOFBTH Feedback input current IFB – 0.4 0 VBOI = 12 V IBoost = 25 mA 2 V < VBOFB< 4 V Buck-Converter; BUO, BDS, BUC and VCC Logic supply voltage VCC 4.9 – 5.1 V 1 mA < ICC < 250 mA; see. appl. circuit Efficiency; see. appl. circuit η Power-Stage ON resistance Power-Stage ON resistance Input current on pin VCC Data Sheet Rev. 1.2 – – – 0.7 – 8 85 0.38 – 0.95 0.2 – 0.5 1.0 1.2 0.5 % Ω Ω A mA RBUON RBUON ICC = 250 mA; VBoost = 25 V Tj = 25 ° C; IBUO = 1 A IBUO = 1 A – Buck overcurrent threshold IBUOC ICC VCC = 5 V 2003-06-02 TLE 6363 Electrical Characteristics (cont’d) 8 V < VBoost < 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 pin; unless otherwise specified. Parameter Buck Gate supply voltage; VBGS = VBDS – VBUO Symbol Limit Values min. typ. – max. 10 V – 5 Unit Test Conditions VBGS Reference Input; R (Oscillator; Timebase for Boost- and Buck-Converter, Reset and Watchdog) Voltage on pin R Oscillator frequency Oscillator frequency Cycle time for watchdog and reset timing Reset Generator; RO Reset threshold; VCC decreasing/increasing VR fOSC fOSC tCYL 1.3 85 75 – 1.4 95 – 1.05 1.5 105 115 – V – kHz Tj = 25 ° C kHz – ms tCYL = 100/fOSC 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 Reset low voltage Reset high voltage Reset pull up current Reset Reaction time Power-up reset delay time VROL VROL VROH IRO tRR tRD – – 0.2 0.2 0.4 0.4 V V VCC – – 0.1 – 50 – 240 100 64 VCC + V 0.1 – 150 – µA µs IROL = 2 mA; 2.5 V < VCC < VRT IROL = 0.2 mA; 1 V < VCC < VRT IROH = 0 mA 0 V < VRO < 4 V tCYL VCC < VRT VCC ≥ 4.8 V Data Sheet Rev. 1.2 9 2003-06-02 TLE 6363 Electrical Characteristics (cont’d) 8 V < VBoost < 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 pin; unless otherwise specified. Parameter Symbol Limit Values min. Watchdog Generator; WDI H-input voltage threshold L-input voltage threshold Watchdog period Start of reset; after watchdog time-out Reset duration; after watchdog time-out Open window time Closed window time Window watchdog trigger time typ. max. Unit Test Conditions VWDIH VWDIL TWD tSR tWDR tOW tCW tWD – – 0.7 × V – – VCC 0.3 × – – – – – – – – V VCC – – – – – – 128 64 64 32 32 46.4 tCYL VCC ≥ 4.8 V tCYL VCC ≥ 4.8 V tCYL VCC ≥ 4.8 V tCYL VCC ≥ 4.8 V tCYL VCC ≥ 4.8 V tCYL VCC ≥ 4.8 V System Enable Output; SEN Enable low voltage Enable low voltage Enable high voltage Enable pull up current VSENL VSENL VSENH ISEN – – 0.2 0.2 0.4 0.4 V V VCC – – 0.1 – 240 VCC + V 0.1 – µA ISENL = 2 mA; 2.5 V < VCC < VRT ISENL = 0.2 mA; 1 V < VCC < VRT ISENH = 0 mA 0 V < VSEN < 4 V Data Sheet Rev. 1.2 10 2003-06-02 TLE 6363 Electrical Characteristics (cont’d) 8 V < VBoost < 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 pin; unless otherwise specified. Parameter Symbol Limit Values min. Boost Status Output; OVL Enable low voltage Boost feedback threshold voltage; typ. max. Unit Test Conditions VOVLL VOVLTH – 2.3 0.2 2.45 0.4 2.6 V V IOVLL = 1 mA; 2.5 V < VCC < VRT See application circuit Thermal Shutdown (Boost and Buck-Converter OFF) Thermal shutdown junction TjSD temperature Thermal switch-on junction TjSO temperature Temperature hysteresis ∆T 150 120 – 175 – 30 200 170 – °C °C K – – – Note: The listed characteristics are ensured over the operating range of the integrated circuit. Typical characteristics specify mean values expected over the production spread. If not otherwise specified, typical characteristics apply at TA = 25 ° C and the given supply voltage. Data Sheet Rev. 1.2 11 2003-06-02 TLE 6363 Circuit Description Below some important sections of the TLE 6363 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. VCC typ. 4.65 V 1V Start-Up RO H L Power ON Delay < t RR < t RD VRT ON Delay Started Invalid ON Delay Stopped Invalid t Invalid t RD Start-Up Normal t RR Failed N Failed t RD Normal t AET02950 Figure 3 Reset Function Data Sheet Rev. 1.2 12 2003-06-02 TLE 6363 Watchdog Operation The watchdog uses one hundred of the oscillator’s clock signal period as a timebase, defined as the watchdog cycle time tCYL. After power-on, the reset output signal at the RO pin (microcontroller reset) is kept LOW for the reset delay time tRD, i.e. 64 cycles. With the LOW to HIGH transition of the signal at RO the device starts the closed window time tCW = 32 cycles. A trigger signal within this window is interpreted as a pretrigger failure according to the figures shown below. After the closed window the open window with the duration tOW is started. The open window lasts at minimum until the trigger process has occurred, at maximum tOW is 32 cycles. A HIGH to LOW transition of the watchdog trigger signal on pin WDI is taken by a trigger. To avoid wrong triggering due to parasitic glitches two HIGH samples followed by two LOW samples (sample period tCYL) are decoded as a valid trigger. If a trigger signal appears at the watchdog input pin WDI during the open window or a power up/down occurs, the watchdog window signal is reset and a new closed window follows. A reset is generated (RO goes LOW) if there is no trigger pulse during the open window or if a pretrigger occurs during the closed window. This reset happens after 64 cycles after the latest valid closed window start time and lasts for further 64 cycles. The triggering is correct also, if the first three samples (two HIGH one LOW) of the trigger pulse at pin WDI are inside the closed window and only the fourth sample (the second LOW sample) is taken in the open window. In addition to the microcontroller reset signal RO the device generates a system enable signal at pin SEN. If RO is HIGH the system enable goes active HIGH with the first valid watchdog trigger pulse at pin WDI. The SEN output goes LOW immediately if a pretrigger, a missing trigger or a power down reset occurs. Data Sheet Rev. 1.2 13 2003-06-02 TLE 6363 TWD = 128 x t CYL t SR = 64 x t CYL t CW = 32 x t CYL t OW = 32 x t CYL Definition Closed Window Open Window Reset duration time after window watchdog time-out t WDR = 64 x t CYL Definition Worst Case Reset start delay time after window watchdog time-out t ECW t CW+OWmin = ( t CW + t OW ) (1 - ∆ ) t CWmax = t CW (1 + ∆ ) t OWmin t WD * t EOW = end of open window Example with: t CYL = 1 ms ∆ = 10% (oscillator deviation) f OSC = f OSCmax f OSC = f OSCmin t OWmin results to: t OWmin = 32 ms - 0.1 x (32 ms + 64 ms) t OWmin = 22.4 ms * recommended watchdog trigger time AET02951 Closed window Open window Watchdog trigger signal Open window Closed window WDI Valid Indifferent Not valid t ECW t EOW AET02952 WDI WDI = Watchdog decoder sample point Figure 4 Window Watchdog Definitions Data Sheet Rev. 1.2 14 2003-06-02 TLE 6363 a) Perfect Triggering after Power on Reset VCC VRT tRD = 64 Cycles RO t 32 Cycles WDWI CW OW CW OW CW 32 Cycles WDI xx xx SEN System Failed b) Incorrect Triggering tWDR = 64 Cycles xx xx xx xx CW t t t1 t2 t3 t System Failed System Enable t tSR = 64 Cycles RO tSR = 64 Cycles TWD = 128 Cycles WDWI CW OW CW OW CW OW CW OW t t WDI 32 Cycles xx 1) x 2) xx x x 3) xx xx 4) xx x xx SEN t 1) Pretrigger 2) t Legend: WDWI = Internal Watchdog Window OW = Open Window (trigger signal at WDI) CW = Closed Window (trigger signal at WDI) x = Sample Point AED02945 Incorrect trigger duration within watchdog open window OW: tHIGH < 2 Cycles 3) Incorrect trigger duration within watchdog open window OW: tLOW < 2 Cycles 4) Missing trigger Figure 5 Window Watchdog Function 15 2003-06-02 Data Sheet Rev. 1.2 TLE 6363 Boost Converter The TLE 6363 contains a fully integrated boost converter (except the boost-diode), which provides a supply voltage for an energy reserve e.g. an airbag firing system. The regulated boost output voltage VBOOST is programmable by a divider network (external resistors) providing the feedback voltage for the boost feedback pin BOFB. The energy which is stored in the external electrolytic capacitor at VBOOST guarantees accurate airbag firing, even if the battery is disconnected by a car crash. The boost inductance LBO (typ. 100 µH) is PWM-switched by an integrated current limited power DMOS transistor with a programmable (external resistor RR) frequency. An internal bandgap reference provides a temperature independent, on chip trimmed reference voltage for the regulation loop. An error amplifier compares the reference voltage with the boost feedback signal VBOFB from the external divider network (determination of the output boost voltage VBOOST). Application note for programming the output voltage at pin VBOOST: ( R BO1 + R BO2 ) V BOOST = V BOFBTH × -----------------------------------R BO2 With a PWM (Pulse Width Modulation) comparator the output of the error amplifier is compared to a periodic linear ramp, provided by a sawtooth signal of the oscillator connected to pin R. A logic signal with variable pulse width is generated. It passes through the logic circuits (sets the output latch PWM-FF) and driver circuits to the power switching DMOS. The Schmitt-trigger output resets the output flip-flop PWM-FF by NOR 2. The PWM signal is gated by the NAND 2 to guarantee a dominant reset. Data Sheet Rev. 1.2 16 2003-06-02 TLE 6363 OV COMP L when NAND 3 OV at VBoost & = VthOV 38 V GND UV COMP + + - L when Tj > 175 ˚C H when Tj > 175 ˚C or OV at VBoost Error Gate Error-FF L when H when NOR 2 R&Q Error Error 1 PWM-FF INV H= & Q OFF 1 H= ON Gate Driver & S Q OC COMP + - VBoost VthUV 4V H when VBoost < 4 V H when Overcurrent NOR 1 1 BOI Pin 14 R = Power D-MOS NAND1 & S Error AMP + - GND & Q NAND 2 & I Pullup 10 µA BOFB Pin 12 PWM COMP + - VthOC 18 mV = Error-Signal Error-Ramp VREF 2.8 V = H when Error-Signal < Error-Ramp 14.5 m Ω BOGND Pin 13 R Sense GND Oscillator R Pin 1 Schmitt-trigger 1 Ramp Vhigh Unlock Detector Vmax Vmin OVL Boost Status Pin 11 Low if Battery Disconnected tr tf tr Vlow t tr tf tr t Clock GND H when Outputcurrent > 1.2 A AEB02946 Figure 6 Boost Converter Block Diagram Figure 7 shows the most important waveforms during operation; for low, medium and high loads up to overload condition. The output transistor is switched off immediately if the overcurrent comparator detects an overcurrent level at the power DMOS or if the sense output switches to low induced by a VBOOST undervoltage command. The TLE 6363 is also protected against several boost loop errors: In case of a feedback interruption a pull up current source (IFB typ. 0.4 µA), integrated at pin BOFB pulls the voltage at the feedback pin BOFB above the reference voltage. The boost output is switched off by the high error voltage which controls the PWM-Comparator at a zero duty cycle. In the case of a resistive loop error caused by leakage currents to ground, the boost output voltage would increase to very high values. In order to protect the VBOOST input as well as the external load against catastrophic failures, an overvoltage protection is provided which switches the output transistor off as soon as the voltage at pin VBOOST exceeds the internal fixed overvoltage threshold VBOOVOFF = typ. 37 V. Data Sheet Rev. 1.2 17 2003-06-02 TLE 6363 Application Note: A short circuit from VBOOST to ground will not destroy the IC, however, it may damage the external boost diode or the boost inductance if there is no overcurrent limitation in that path. and VC Error Voltage VError VCP VCV OCLK H L PWM H L t t t I BOI I BOLI I DBO t VBOI VBOOST VS t t Overcurrent Threshold Exceeded Load-Current Increasing with Time; Controlled by the Error Amp Controlled by the Overcurrent Comp AED02672 Figure 7 Most Important Waveforms of the Boost Converter Circuit Data Sheet Rev. 1.2 18 2003-06-02 TLE 6363 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 regulator supply is given by the boost converter output VBOOST, in case of a battery power-down the stored energy of the boost converter capacitor is used. Like the boost converter, 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. Data Sheet Rev. 1.2 19 2003-06-02 TLE 6363 VCC 39.7 Ω R VCC3 - R VCC4 10.3 Ω BUC Pin 6 = = VthOV 1.2 V R Prot1 200 Ω VCC Pin 7 L when Overcurrent Error AMP + - VCC R VCC1 22 Ω R VCC2 28 Ω PWM H when Error- COMP Error-Signal < Signal Error-Ramp ErrorRamp + - NOR 1 Output Stage OFF when H 1 R PWM-FF & H= Q OFF INV 1 H= ON Gate Driver & S Q BUO Pin 8 Power D-MOS = VREF 2.8 V GND GND L when Tj > 175 ˚C Error-FF R & Q OFF when H NAND 2 & Oscillator R Pin 1 Schmitt-trigger 1 & S Q Vmax Vmin tr tf tr t Ramp Vhigh Vlow tr tf tr t Clock AEB02947 Figure 8 Buck Converter Block Diagram 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. The pulse width is then controlled by the overcurrent comparator as seen before in the boost description. In order to protect the VCC input as well as the external load against catastrophic failures, an overvoltage protection is provided which switches the output transistor off as soon as the voltage at pin VCC exceeds the internal fixed overvoltage threshold VBUOVOFF = typ. 6.0 V. Data Sheet Rev. 1.2 20 + - GND GND + - OV COMP H when OV at VCC + UV COMP H when UV at VBoost = VthUV 4V L when Overcurrent VBoost Pin 9 OC COMP VthOC 18 mV GND R Sense 18 mΩ Boost Driver Supply BDS Pin 10 2003-06-02 TLE 6363 and VC Error Voltage VError VCP VCV OCLK H L PWM H L t t t I BUO I BULI I DBU t VBUO VBOOST t VCC5 t Overcurrent Threshold Exceeded Load-Current Increasing with Time; Controlled by the Error Amp Controlled by the Overcurrent Comp AED02673 Figure 9 Most Important Waveforms of the Buck Converter Circuit Data Sheet Rev. 1.2 21 2003-06-02 TLE 6363 Application Circuit Figure 10 shows the application circuit of the TLE 6363 with the suggested external parts. D1 D2 L BO 100 µH DBO I BOLoad VBatt CL 10 µF ZD1 36 V CS 220 nF CBO1 10 nF TLE 6363 G BOFB 12 Boost Converter 100 k Ω CBO1 CBO2 4700 µF 220 nF 10 k Ω R BO1 R BO2 VBOOST 14 BOI 13 BOGND Biasing VBoost CBOT 10 BDS 10 nF 9 VBOOST VREF BUC 6 Buck Converter L BU 8 BUO 7 VCC 220 µH DBU 47 k Ω R BUC CBUC 470 nF CBU1 100 µF CBU2 220 nF VCC System Enable Output Watchdog Trigger Output VInternal 5 SEN Reference Current Generator and Oscillator Reset Window Watchdog and System Enable 3 WDI 10 k Ω R1 2 RO 47 k Ω RR Reset Output Boost Status Output 11 OVL 4 GND Device Type D1 D2 D BO D BO D BU L BO L BO L BU L BU BAW78C BAW78C BAW78B SS14 - Supplier Remarks Infineon 200 V; 1 A; SOT-89 Infineon 200 V; 1 A; SOT-89 Infineon 100 V; 1 A; SOT-89 multiple Schottky; 40 V; 1 A Schottky; 100 V; 1 A B82442-A1104 EPCOS 100 µH; 0.25 A; 1.28 Ω Do3316P-104 Coilcraft 100 µH; 1.2 A; 0.28 Ω B82442-H2204 EPCOS 220 µH; 0.24 A; 2.72 Ω Do3316P-224 Coilcraft 220 µH; 0.8 A; 0.61 Ω AEB03007 Figure 10 Application Circuit Data Sheet Rev. 1.2 22 2003-06-02 TLE 6363 Diagrams: Oscillator and Boost/Buck-Converter Performance In the following the behaviour of the Boost/Buck-converter and the oscillator is shown. Oscillator Frequency Deviation vs. Junction Temperature ∆f OSC 10 kHz 5 Referred to f OSC at Tj = 25 ˚C AED02938 Boost Feedback Current vs. Junction Temperature I FB -200 nA -300 AED02939 0 -400 -5 -500 -10 -600 -15 -50 -25 0 25 50 75 100 ˚C 150 -700 -50 -25 0 25 50 75 100 ˚C 150 Tj Tj Data Sheet Rev. 1.2 23 2003-06-02 TLE 6363 Current Consumption vs. Junction Temperature I Boost 3 mA 2.5 Boost ON Buck ON I BO boost = 0 mA I CC = 0 mA AED02940 Efficiency Buck vs. Boost Voltage 95 AED02941 η% 90 VCC = 5 V 85 2 80 I Load = 120 mA 80 mA 1.5 75 1 70 40 mA 0.5 -50 -25 0 25 50 75 100 ˚C 150 65 5 15 25 V 30 Tj VBoost Efficiency Buck vs. Load η 90 % 85 RT, HT CT AED02942 80 75 70 65 50 150 mA 250 I LOAD Data Sheet Rev. 1.2 24 2003-06-02 TLE 6363 Efficiency Boost vs. Input Voltage η 95 % 90 HT AED02943 Boost Output Voltage vs. Load VBoost 31 V AED02944 I Boost = 60 mA 30 85 RT 80 CT 29 RT HT CT 28 75 27 70 8 10 12 14 V 16 26 20 40 60 80 mA 100 VBatt I LOAD Oscillator Frequency vs. Resistor from R to GND Boost and Logic Output Voltage vs. Junction Temperature VBoost 30 V 29 28 27 AED02983 fOSC 1000 kHz 500 AED02982 I Boost = 50 mA 200 @ Tj = 25 ˚C 100 26 VCC 50 V 5.025 5.000 4.975 I CC = 250 mA 20 10 5 10 20 50 100 200 kΩ 1000 4.950 -50 -25 0 25 50 75 100 ˚C 150 RR Tj Data Sheet Rev. 1.2 25 2003-06-02 TLE 6363 Boost and Buck ON Resistance vs. Junction Temperature R ON 1000 mΩ 800 AED02984 Boost and Buck Overcurrent Threshold vs. Junction Temperature I OC 1.4 A 1.3 AED02985 R BOON @ I BOI = 1 A 700 600 500 400 1.1 1.2 I BOOC (Boost-Converter) R BUON @ I BUO = 1 A 300 200 100 0 -50 -25 0 25 50 75 100 ˚C 150 1 I BUOC (Buck-Converter) 0.9 0.8 -50 -25 0 25 50 75 100 ˚C 150 Tj Tj Data Sheet Rev. 1.2 26 2003-06-02 TLE 6363 Package Outlines P-DSO-14-2 (Plastic Dual Small Outline Package) Sorts of Packing Package outlines for tubes, trays etc. are contained in our Data Book “Package Information” SMD = Surface Mounted Device Data Sheet Rev. 1.2 27 Dimensions in mm 2003-06-02 GPS05474 TLE 6363 Edition 2003-06-02 Published by Infineon Technologies AG, St.-Martin-Strasse 53, D-81541 München, Germany © Infineon Technologies AG 2003. All Rights Reserved. Attention please! The information herein is given to describe certain components and shall not be considered as warranted characteristics. Terms of delivery and rights to technical change reserved. We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descriptions and charts stated herein. Infineon Technologies is an approved CECC manufacturer. Information For further information on technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies Office in Germany or our Infineon Technologies Representatives worldwide (see address list). Warnings Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies Office. Infineon Technologies Components may only be used in life-support devices or systems 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. Data Sheet Rev. 1.2 28 2003-06-02