Step-Down DC/DC Controller 1 Overview 1.1 Features • • • • • • • • • • • • • • • 1) TLE 6389 Input voltage range from < 5V up to 60V Output voltage: 5V fixed or adjustable (7V to 15V) Output voltage accuracy: 3% Output current up to 2.3A 100% maximum duty cycle Less than 120µA quiescent current at low loads1) 2µA max.
TLE 6389 1.2 Short functional description The TLE 6389 step-down DC-DC switching controllers provide high efficiency over loads ranging from 1mA up to 2.5A. A unique PWM/PFM control scheme operates with up to a 100% duty cycle, resulting in very low dropout voltage. This control scheme eliminates minimum load requirements and reduces the supply current under light loads to 120µA, depending on dimensioning of external components.
TLE 6389 1.4 Basic block diagram VS VOUT BDS ENA BLE Battery Sense and Undervoltage Reset Internal Power Supply and Biasing FB SIGND SI RO SO PWM / PFM Regulator Driver G DRV CS COMP Clock generator Voltage Reference Block SYNC TLE 6389GV GND Datasheet Rev. 2.
TLE 6389 1.5 Pin Definitions and Functions Pin No Symbol Function 1 ENABLE Active-High enable input (only at adjustable version, TLE6389-2 GV) for the device. The device is shut down when ENABLE is driven low. In this shut downmode the reference, the output and the external MOSFET are turned off. Connect to logic high for normal operation. 1 SI_ENA BLE Active-High enable input (only at 5V version, TLE6389-2 GV50 and TLE6389-3 GV50) for SI_GND input.
TLE 6389 Pin No Symbol Function 10 RO Reset output. Open drain output from undervoltage reset comparator at the adjustable version (TLE6389-2 GV), Pull down structure with an internal 20kΩ pull up resistor to VOUT at the 5V version (TLE6389-2 GV50 and TLE6389-3 GV50). 11 BDS Buck driver supply input. Connect a ceramic capacitor between BDS and VS to generate clamped gate-source voltage to supply the driver of the PMOS power stage. 12 GDRV Gate drive output.
TLE 6389 2 Item Absolute Maximum Ratings Parameter Symbol Limit Values Unit min. max. Remarks Device supply input VS 2.1 Voltage VVS -0.3 61 V 2.2 Current IVS – – – – Current sense input CS 2.3 Voltage VCS -0.3 61 V 2.4 Current ICS – – – |VVS - VCS| < 0.3V Gate drive output GDRV 2.5 Voltage VGDRV – 0.3 61 V -0.3V < |VVS VGDRV| < 6.8V; -0.3V < |VBDS VGDRV| < 6.8V 2.6 Current IGDRV – – – limited internally -0.3V < |VVS VBDS| < 6.8V Buck driver supply input BDS 2.
TLE 6389 2 Item Absolute Maximum Ratings (cont’d) Parameter Symbol Limit Values Unit min. max. Remarks Sense comparator input SI 2.17 Voltage VSI – 0.3 61 V 2.18 Current ISI – – – Sense comparator output SO 2.19 Voltage VSO – 0.3 6.8 V 2.20 Current ISO – – – limited internally Buck output voltage input VOUT 2.21 Voltage VVOUT – 0.3 15 V TLE6389-2 GV 2.22 Voltage VVOUT – 0.3 6.8 V TLE6389-2 GV50, TLE6389-3 GV50 2.
TLE 6389 2 Absolute Maximum Ratings (cont’d) Item Parameter Symbol Limit Values Unit min. max. Remarks Temperatures 2.33 Junction temperature Tj -40 150 °C – 2.34 Storage temperature Tstg -50 150 °C – 1) ESD susceptibility HBM according to EIA/JESD 22-A 114B. 2) ESD susceptibility CDM according to JESD 22-C101. Note: Stresses above the ones listed here may cause permanent damage to the device.
TLE 6389 3 Operating Range Item Parameter Symbol Limit Values min. max. Unit Remarks 3.1 Supply voltage range VVS 5 60 V 3.2 Output voltage adjust range TLE 6389-2 GV VOUT 7 15 V TLE 6389-2 GV 3.3 Sense Resistor RSENSE 10 47 mΩ Calculation see section 7 3.4 PMOS, on+off delay ton+off - tmin300 1) ns tmin= VVOUT/ (VVS*fSW) delay 3.5 Buck driver supply capacitor CBDS 220 - nF 3.6 Buck inductance L1 47 - µH 3.7 Buck inductance L1 22 100 µH 3.
TLE 6389 4 Electrical Characteristics 5V < VVS < 48V; -40°C < Tj < 150 °C; All voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified Item Parameter Symbol Limit Values min. typ. Unit Test Condition max. Current Consumption1) TLE6389-2 GV50 and TLE6389-3 GV50 4.1 Current IVS consumption of VS 4.2 4.3 4.4 Current consumption of SI_ENABLE Current consumption of VOUT ISI_ENABL Current consumption of SI Datasheet Rev. 2.
TLE 6389 4 Electrical Characteristics (cont’d) 5V < VVS < 48V; -40°C < Tj < 150 °C; All voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified Item Parameter Symbol Limit Values min. typ. Unit Test Condition max. Current Consumption1) TLE6389-2 GV (variable) 4.7 Current IVS consumption of VS 80 150 µA VVS = 48V; VENABLE = H; PFM mode; VOUT > 7V 4.8 Current consumption of VS 70 85 µA VVS = 13.
TLE 6389 4 Electrical Characteristics (cont’d) 5V < VVS < 48V; -40°C < Tj < 150 °C; All voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified Item Parameter Symbol Limit Values min. typ. Unit Test Condition max. Buck Controller 4.14 Output voltage VVOUT 4.85 5.00 5.15 V TLE6389-2 GV50, TLE6389-3 GV50; VVS=13.5V& 48V; PWM mode IOUT = 0.5 to 2A; RSENSE = 22mΩ; RM1 = 0.25Ω; RL1 = 0.1Ω; 4.15 4.75 5.00 5.
TLE 6389 4 Electrical Characteristics (cont’d) 5V < VVS < 48V; -40°C < Tj < 150 °C; All voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified Item Parameter Symbol Limit Values min. typ. Unit Test Condition V TLE6389-2 GV; Calibrated divider, see section 7.3; VVS = 24V; IOUT = 15mA; PFM Mode; RSENSE = 22mΩ; RM1 = 0.25Ω; RL1 = 0.
TLE 6389 4 Electrical Characteristics (cont’d) 5V < VVS < 48V; -40°C < Tj < 150 °C; All voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified Item Parameter Symbol Limit Values min. typ. Unit Test Condition max. 4.24 Line regulation | ∆VVOUT | 35 mV TLE6389-2 GV50, TLE6389-3 GV50, VVS = 9V to 16V; IOUT = 1A; RSENSE = 22mΩ; PWM mode 4.
TLE 6389 4 Electrical Characteristics (cont’d) 5V < VVS < 48V; -40°C < Tj < 150 °C; All voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified Item Parameter Symbol Limit Values Unit Test Condition 40 mV/ A TLE6389-2 GV50, TLE6389-3 GV50, IOUT = 0.5A to 2A; VVS = 5.8V & 48V; RSENSE = 22mΩ 8* VOUT _nom/ V mV/ A TLE6389-2 GV, IOUT = 0.5 to 2A; VVS= 13.5V & 48V; RSENSE = 22mΩ min. typ. 4.27 Load regulation ∆VVOUT / ∆ILOAD 4.28 max. 4.
TLE 6389 4 Electrical Characteristics (cont’d) 5V < VVS < 48V; -40°C < Tj < 150 °C; All voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified Item Parameter Symbol Limit Values min. typ. 4.35 Gate driver, gate voltage, fall time tf 4.36 Peak current limit threshold voltage VLIM = VVS – VCS 4.37 Oscillator frequency 4.38 Unit Test Condition VENABLE/SI_ENABLE =5V CBDS = 220 nF CGDRV = 4.7nF max.
TLE 6389 4 Electrical Characteristics (cont’d) 5V < VVS < 48V; -40°C < Tj < 150 °C; All voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified Item Parameter Symbol Limit Values Unit Test Condition 1.12 V TLE6389-2 GV; VVOUT decreasing 1.17 V TLE6389-2 GV; VVOUT increasing kΩ TLE6389-2 GV50, TLE6389-3 GV50; Internally connected to VOUT V TLE6389-2 GV50, TLE6389-3 GV50; IRO=0mA min. typ. 4.48 Reset threshold VFB, RT 4.49 max. 4.
TLE 6389 4 Electrical Characteristics (cont’d) 5V < VVS < 48V; -40°C < Tj < 150 °C; All voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified Item Parameter Symbol Limit Values min. typ. Unit Test Condition max. ENABLE Input 4.59 4.60 Enable ONthreshold Enable OFFthreshold VENABLE, 4.5 V ON 0.8 VENABLE, V OFF SI_ENABLE Input 4.61 4.62 Enable ONthreshold Enable OFFthreshold VENABLE, 4.5 V ON VENABLE, 0.8 V OFF SI_GND Input 4.
TLE 6389 4 Electrical Characteristics (cont’d) 5V < VVS < 48V; -40°C < Tj < 150 °C; All voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified Item Parameter Symbol Limit Values min. typ. max. 150 200 Unit Test Condition °C 2) K 2) Thermal Shutdown 4.71 Thermal shutdown TjSD junction temperature 4.72 Temperature hysteresis ∆T 175 30 1) The device current measurements for IVS and IFB exclude MOSFET driver currents.
TLE 6389 5 Typical Performance Characteristics Current consumption IVS vs. temperature Tj at enabled device and VVS=13.5V IVS µA Current consumption IVOUT vs. temperature Tj at enabled device and VVOUT=5.5V 90 IVOUT µA 80 180 170 70 160 60 150 50 140 40 130 30 120 20 -50 -20 10 40 70 100 130 Tj 110 -50 160 -20 10 40 70 100 130 °C µA Current consumption IVOUT vs.
TLE 6389 Internal oscillator frequency fOSC vs. temperature Tj fOSC kHz Peak current limit threshold voltage VLIM vs. temperature Tj 380 VLIM mV 370 110 100 360 90 350 80 340 70 330 60 320 50 310 -50 -20 10 40 70 100 130 Tj 40 -50 160 -20 10 40 70 100 130 °C ns Gate driver supply VVS - VBDS vs. temperature Tj 350 8.6 VVS-VBDS V 325 8.4 300 8.2 275 8.0 250 7.8 225 7.6 200 7.4 175 -50 160 °C Minimum on time tMIN (blanking) vs.
TLE 6389 Output voltage VVOUT vs. temperature Tj in PFM mode (VVS=24V,ILoad=15mA,-3GV50) Lower Reset threshold VFB,RT vs. temperature Tj (-2GV) 5.15 VVOUT V VFB,RT V 5.10 1.14 1.13 5.05 1.12 5.00 1.11 4.95 1.10 4.90 1.09 4.85 1.08 4.80 -50 -20 10 40 70 100 130 Tj 1.07 -50 160 -20 10 40 70 100 130 °C 160 °C Lower Reset threshold VVOUT, RT vs. temperature Tj (-3GV50) Internal pull up resistors RRO and RSO vs. temperature Tj (-3GV50) 3.72 VVOUT,RT V Tj RRO kΩ 3.
TLE 6389 Lower Sense threshold VSI, low vs. temperature Tj VSI,low V Output Voltage vs. Load Current, TLE6389-2 GV50 1.28 VOUT V 7 1.27 6 1.26 5 1.25 4 1.24 3 1.23 2 1.22 1 1.21 -50 0 -20 10 40 70 100 130 Tj 160 TLE 6389-2 GV50 RSENSE = 50mΩ VVS = 13.5V App. Circuit Fig. 3 0 0.25 0.5 0.75 1.0 1.25 1.5 1.75 ILOAD A °C Output Current vs. Load Current, TLE6389-3 GV50 On resistance of SI_GND switch RSW vs.
TLE 6389 Output Voltage vs Load Current VOUT 1.4 TLE 6389-2 GV RSENSE = 50mΩ VVS = 13.5V App. Circuit Fig. 3 VOUT,nom 1.2 1.0 0.8 0.6 0.4 0.2 0 0 0.25 0.5 0.75 1.0 1.25 1.5 1.75 ILOAD A Datasheet Rev. 2.
TLE 6389 6 Detailed circuit description In the following, some internal blocks of the TLE6389 are described in more detail. For the right choice of the external components please refer to the section application information. 6.
TLE 6389 The ON-trigger is set periodically by the internal oscillator when acting in PWM mode and is given by the output of the WAKE-comparator when operating in PFM mode. The Multiplexer (MUX) is switched by the output of the MODE-detector which distinguishes between PFM and PWM by tracking the output voltage (goto PFM) and by tracking the gate trigger frequency (goto PWM). In PFM mode the peak current limit is reduced to prevent overshoots at the output of the buck regulator.
TLE 6389 7 Application information Note: The following information is given as a hint for the implementation of the device only and shall not be regarded as a description or warranty of a certain functionality, condition or quality of the device. 7.1 General The TLE 6389 step-down DC-DC controllers are designed primarily for use in Automotive applications where high input voltage range requirements have to be met.
TLE 6389 RSENSE= VIN M1 47mΩ to e.g. 5V rail C IN1 = 100 µF C BDS= RSO= RRO= 20kΩ D1 220 nF 11 13 RSI1= 400kΩ RSI2= 100kΩ V OUT L1 = 47 µH BDS 14 CS 12 3 GDRV VOUT SO VS CIN2 = 220nF TLE6389-2 GV 7 FB COMP SI SI_GND ENABLE 6 1 SYNC GND RO 5 4 10 9 COUT = 100 µF RFB1= 330kΩ to µC 2 2.
TLE 6389 7.4 SI_Enable Connecting SI_ENABLE to 5V causes SI_GND to have low impedance. Thus the SI comparator is in operation and can be used to monitor the battery voltage. SO output signal is valid. Connecting SI_ENABLE to GND causes SI_GND to have high impedance. Thus the SI comparator is not able to monitor the battery voltage. SO output signal is invalid. 7.
TLE 6389 VIN t < trr VVOUT VFB VVOUT, RT VFB,RT t trr VRO trd trd trd trd t thermal shutdown under voltage Figure 4 Reset timing 7.7 100% duty-cycle operation and dropout over load The TLE 6389 operates with a duty cycle up to 100%. This feature allows to operate with the lowest possible drop voltage at low battery voltage as it occurs at cold cranking.
TLE 6389 7.8 SYNC Input and Frequency Control The TLE 6389’s internal oscillator is set for a fixed PWM switching frequency of 360kHz or can be synchronized to an external clock at the SYNC pin. When the internal clock is used SYNC has to be connected to GND. SYNC is a negative-edge triggered input that allows synchronization to an external frequency ranging between 270kHz and 530kHz.
TLE 6389 To achieve the same effect of slope compensation in the adjustable voltage version also the inductance in µH is given by –4 H H 2,0 × 10 – 4 ⋅ -------- ⋅ V OUT ⋅ R SENSE < L1 < 4,0 × 10 ⋅ --------- ⋅ V ⋅ R SENSE VΩ VΩ OUT The inductance value determines together with the input voltage, the output voltage and the switching frequency the current ripple which occurs during normal operation of the step down converter.
TLE 6389 7.10.3 PFM and PWM thresholds The crossover thresholds PFM to PWM and vice versa strongly depend on the input voltage VIN, the Buck converter inductance L1, the sense resistor value RSENSE and the turn on and turn off delays of the external PMOS. For more details on the PFM to PWM and PWM to PFM thresholds please refer to the application note “TLE6389 - Determining PFM/PWM current thresholds”. 7.10.
TLE 6389 7.10.6 Freewheeling diode / catch diode (D1) For lowest power loss in the freewheeling path Schottky diodes are recommended. With those types the reverse recovery charge is negligible and a fast hand over from freewheeling to forward conduction mode is possible. Depending on the application (12V battery systems) 40V types could be also used instead of the 60V diodes. Also for high temperature operation select a Schottky-diode with low reverse leakage.
TLE 6389 7.11 Components recommendation - overview Device Type Supplier Remark CIN1 Electrolytic /Foil type various 100µF, 60V CIN2 Ceramic various 220nF, 60V L1 B82464-A4473 EPCOS 47µH, 1.6A, 145mΩ B82479-A1473-M EPCOS 47µH, 3.5A, 47mΩ DO3340P-473 Coilcraft 47µH, 3.8A, 110mΩ DO5022P-683 Coilcraft 68µH, 3.5A, 130mΩ DS5022P-473 Coilcraft 47µH, 4.0A, 97mΩ BSO 613SPV Infineon 60V, 3.44A, 130mΩ, NL BSP 613P Infineon 60V, 2.
TLE 6389 8 Package Outlines 1.75 MAX. C 1) 4 -0.2 B 1.27 0.64 ±0.25 0.1 2) 0.41+0.10 -0.06 6±0.2 0.2 M A B 14x 14 0.2 M C 8 1 7 1) 8.75 -0.2 8˚MAX. 0.19 +0.06 0.175 ±0.07 (1.47) 0.35 x 45˚ A Index Marking 1) Does not include plastic or metal protrusion of 0.15 max. per side 2) Lead width can be 0.61 max.
TLE 6389 9 Revision History Version Date Rev. 2.0 2006-08-24 Final Datasheet TLE 6389-2/-3 Rev. 2.1 2007-08-13 Initial version of RoHS-compliant derivate of TLE 6389-2/-3 – page 1: AEC certified statement added – page 1 and page 36: RoHS compliance statement and green product feature added – page 1 and page 36: Package changed to RoHS compliant version – Legal Disclaimer updated Datasheet Rev. 2.
Edition 2007-08-13 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.
