Step Down Voltage-Regulator

www.DataSheet4U.com Step Down Voltage-Regulator with Reset Datasheet 1 Overview TLE 6365 1.1 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 P-DSO-8 SMD package Ordering Code Q67006-A9515 P-DSO-8-3 Type TLE 6365 G Functional description General Package P-DSO-8-3 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 P-DSO-8-3 SMD package meets the application requierements. It delivers a precise 5V 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. Data Sheet Rev. 1.7 1 2003-06-02 www.DataSheet4U.com TLE 6365 1.2 Pin No 1 Pin Definitions and Functions Symbol Function R 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 devider) 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 Pin Configuration R RO BUC GND 1 2 3 4 8 7 6 5 VS BUO BDS VCC P-DSO-8-3 Figure 1 Pin Configuration (top view) Data Sheet Rev. 1.7 2 2003-06-02 www.DataSheet4U.com TLE 6365 1.3 Block Diagram VS 8 Biasing and VREF BUC 6 BDS 3 Buck Converter 7 BUO TLE 6365 G R 1 Reference Current Generator and Oscillator Vinternal 5 VCC Undervoltage Reset Generator 2 RO 4 GND Figure 2 Block Diagram Data Sheet Rev. 1.7 3 2003-06-02 www.DataSheet4U.com TLE 6365 1.4 Parameter Absolute Maximum Ratings Symbol Limit Values min. max. Unit Remarks Voltages Supply voltage Buck output voltage Buck driver supply voltage Buck compensation input voltage Logic supply voltage Reset output voltage Current reference voltage VS VBUO VBDS VBUC VCC VRO VR – 0.3 –1 – 0.3 – 0.3 – 0.3 – 0.3 – 0.3 46 46 55 6.8 6.8 6.8 6.8 V V V V V V V ESD-Protection (Human Body Model; R=1,5kΩ; C=100pF) 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. 1.7 4 2003-06-02 www.DataSheet4U.com TLE 6365 1.5 Operating Range Parameter Supply voltage Supply voltage Supply voltage Supply voltage Buck output voltage Buck driver supply voltage Buck compensation input voltage Logic supply voltage Reset output voltage Current reference voltage Junction temperature Thermal Resistance Junction ambient Symbol VS VS VS VS VBUO VBDS VBUC VCC VRO VCREF Limit Values min. – 0.3 5 4.5 – 0.3 – 0.6 – 0.3 0 4.0 – 0.3 0 – 40 max. 40 35 36 4.5 40 50 3.0 6.2 VCC +0.3 1.23 150 Unit V V V V V V V V V V °C Remarks VS increasing VS decreasing Buck-Converter OFF Tj Rthj-a 180 K/W – Data Sheet Rev. 1.7 5 2003-06-02 www.DataSheet4U.com TLE 6365 1.6 Electrical Characteristics 8V< VS < 35V; 4.75V< VCC <5.25V; - 40°C< Tj <150°C; RR=47kΩ; all voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified No. Parameter Symbol Limit Values min. typ. Unit Test Condition max . 1.6.1 Current Consumption 1.6.1.1 Current consumption; see applicatiopn circuit 1.6.1.2 Current consumption; see applicatiopn circuit IS IS 1.5 5 4 10 mA mA ICC=0mA ICC=400mA 1.6.2 Under- and Over-Voltage Lockout at VS 1.6.2.1 UV ON voltage; buck conv. ON 1.6.2.2 UV OFF voltage; buck conv. OFF 1.6.2.3 UV Hysteresis voltage 1.6.2.4 OV OFF voltage; buck conv. OFF 1.6.2.5 OV ON voltage; buck conv. ON 1.6.2.6 OV Hysteresis voltage VSUVON VSUVOFF VSUVHY VSOVOFF VSOVON VSUVHY 4.0 3.5 0.2 34 30 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 VS increasing; VS decreasing HY = ON OFF VS increasing VS decreasing HY = OFF ON 1.6.3 Over-Voltage Lockout at VCC 1.6.3.1 OV OFF voltage; buck conv. OFF 1.6.3.2 OV ON voltage; buck conv. ON 1.6.3.3 OV Hysteresis voltage VCCOVOFF 5.5 6.0 6.5 V VCC increasing VCC decreasing HY = OFF ON VCCOVON 5.25 5.75 VCCOVHY 0.10 0.25 6.25 V 0.50 V Data Sheet Rev. 1.7 6 2003-06-02 www.DataSheet4U.com TLE 6365 1.6 Electrical Characteristics (cont’d) 8V< VS < 35V; 4.75V< VCC <5.25V; - 40°C< Tj <150°C; RR=47kΩ; all voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified No. Parameter Symbol Limit Values min. typ. Unit Test Condition max . 1.6.4 Buck-Converter; BUO, BDS, BUC and VCC 1.6.4.1 Logic supply voltage VCC 4.9 5.1 V 1mA < ICC< 400mA; see. appl. circuit 1.6.4.2 Efficiency; see. appl. circuit η 85 % ICC = 400mA; VS = 14V Tj=25°C; IBUO= 0.6A IBUO= 0.6A 1.6.4.3 Power-Stage ON resistance 1.6.4.4 Power-Stage ON resistance 1.6.4.6 Input current on pin VCC 1.6.4.7 Buck Gate supply voltage; VBGS=VS - VBDS 1.6.5 RBUON RBUON 0.7 5 0.38 0.5 1.0 Ω Ω A µA V 1.6.4.5 Buck overcurrent threshold IBUOC ICC VBGS 0.9 7.2 1.2 500 10 VCC=5V Reference Input ; R (Oscillator; Timebase for Buck-Converter and Reset) 1.6.5.1 Voltage on pin R 1.6.5.2 Oscillator frequency 1.6.5.3 Oscillator frequency 1.6.5.4 Cycle time for reset timing VR fOSC fOSC tCYL 1.4 85 75 1 95 105 115 RR = 100kΩ kHz Tj = 25°C V kHz ms tCYL = 100 / fOSC Data Sheet Rev. 1.7 7 2003-06-02 www.DataSheet4U.com TLE 6365 1.6 Electrical Characteristics (cont’d) 8V< VS < 35V; 4.75V< VCC <5.25V; - 40°C< Tj <150°C; RR=47kΩ; all voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified No. Parameter Symbol Limit Values min. typ. Unit Test Condition max . 1.6.6 Reset Generator; RO 1.6.6.1 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>1V IROL=1mA; 2.5V < VCC < VRT IROL=0.2mA ; 1V < VCC < VRT IROH = 0mA 0V < VRO< 4V VCC < VRT 1.6.6.2 Reset low voltage VROL - 0.2 0.4 V 1.6.6.3 Reset low voltage VROL - 0.2 0.4 V 1.6.6.4 Reset high voltage 1.6.6.5 Reset pull up curent 1.6.6.6 Reset Reaction time VROH IRO VCC -0.1 240 10 40 128 VCC V +0.1 µΑ 90 µs tRR 1.6.6.7 Power-up reset delay time tRD tCYL VCC ≥ 4.8 V 1.6.7 Thermal Shutdown (Boost and Buck-Converter OFF) 1.6.7.1 Thermal shutdown junction TjSD temperature 1.6.7.2 Thermal switch-on junction TjSO temperature 1.6.7.3 Temperature hysteresis ∆T 150 120 30 175 200 170 °C °C K Data Sheet Rev. 1.7 8 2003-06-02 www.DataSheet4U.com TLE 6365 2 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. VCC VPG VRT typ.4,70V typ.4,65V < tRR < tRD 1V Start Up ON Delay ON Delay started stopped ON Delay t RO Power H L invalid tRD tRR invalid Normal Failed N invalid tRD t Sart-Up Failed Normal Figure 3 Reset Function Data Sheet Rev. 1.7 9 2003-06-02 www.DataSheet4U.com 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. VCC RVCC3 39R7 RVCC4 10R3 BUC Pin 3 RProt1 200Ω GND + - VthOV 1,2V GND H when UV at VBOOST + L when Overcurrent VthUV 4V GND OC COMP L when Overcurrent NOR1 Gate Driver Su