Step-Down DC/DC Controller TLE 6389 1Overview 1.1 Features 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 PDSO14389111 100% maximum duty cycle 1) Less than 120A quiescent current at low loads 2A max. shutdown current at device off (TLE 6389-2 GV) Fixed 360kHz switching frequency Frequency synchronization input for external clocks Current Mode control scheme Integrated output under voltage Reset circuit On chip low battery detector (on chip comparator) Automotive temperature range -40C to 150 C Green Product (RoHS compliant) AEC qualified 1) dependend on external components R = SENSE M1 V L = 47 H VV 47m 1 IN OUOUTT I OUT C = IN1 C = OUT C = 100 F D1 BDS 100 F 220 nF M1: Infineon BSO613SPV 11 14 12 2 Infineon BSP613P BDS CS GDRV 3 FB 13 D1: Motorola MBRD360 VOUT VS R = C = 9 L1: EPCOS B82479-A1473-M SI1 IN2 SO 400k 220nF Coilcraft DO3340P-473 TLE6389-3 GV50 7 8 SI C : Electrolythic IN1 COMP C : Ceramic IN2 R = SI GND SI ENABLE SYNC GND RO SI2 2.2nF 680 C : Low ESR Tantalum OUT 100k 6 1 5 4 10 ON OFF Type Package Description TLE 6389-2 GV PG-DSO-14-1 adjustable TLE 6389-2 GV50 PG-DSO-14-1 5V, RO-Hysteresis << TLE 6389-3 GV50 PG-DSO-14-1 5V, RO-Hysteresis 1V Datasheet Rev. 2.1 1 2007-08-13TLE 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 120A, depending on dimensioning of external components. In addition the adjustable version TLE6389-2 GV can be shut down via the Enable input reducing the input current to <2A. The TLE 6389 step-down controllers drive an external P-channel MOSFET, allowing design flexibility for applications up to 12.5W of output power. A high switching frequency and operation in continuous-conduction mode allow the use of tiny surface- mount inductors. Output capacitor requirements are also reduced, minimizing PC board area and system costs. The output voltage is preset at 5V (TLE6389-2 GV50 and TLE6389-3 GV50) and adjustable for the TLE6389-2 GV. The version TLE6389-2 GV50 features a reset function with a threshold between 4.5V and 4.8V, including a small hysteresis of typ. 50mV. In the version TLE6389-3 GV50 the device incorporates a reset with a typ. 1V hysteresis. Input voltages of all TLE 6389 can be up to 60V. 1.3 Pin Configuration (top view) ENABLE / 1 14 CS SI ENABLE FB 2 13 VS VOUT 3 12 GDRV GND 4 11 BDS P-D-SO-14 SYNC 5 10 RO SI GND 6 9 SO SI 7 8 COMP Datasheet Rev. 2.1 2 2007-08-13