Introduction bus ic dc/dc converter motor driver ic ripple counter driver ic I/O ic Sensor interface ic sensor ic ip’s E 910.22 Wide range flyb. SMPS with WD E 910.24 | 25 | 26 PFM controller family E 910.27 Step down converter, fully integr. E 981.03 Energy storage controller ÿ E 910.28 Step down converter, for ext. FET features application ÿ Wide input range of 5V to 60V ÿ Automotive electronics ÿ Wide, adjustable output voltage of 1.25V to (Vin-0.5V) ÿ Controller and sensor supply ÿ Output current range of 0mA to > 10A depending ÿ LED supply ÿ General supply applications only on external PFET pinning Pin ÿ Supports optional external NFET as free wheeling diode ÿ Very high efficiency over load current range description ÿ Very low shutdown current with internal supply off The IC is developed and optimized for automotive applications (20µA typical) where it can be used to supply controllers, sensors, Power-LEDs ÿ Low standby current with internal supply on for fast and many other devices. The reference input allows it to control start up (<200µA typical) the output voltage (or current) with e.g. an external DAC. That ÿ 100% duty cycle possible makes it easy to build LED-dimmer or any application that needs ÿ Easy to use chaotic regulation behaviour variable supply. ÿ Fast multi-loop-regulation ÿ Adaptive frequency selection up to 300kHz For fast load and line regulation a multi-loop regulation is imple- ÿ No compensation necessary mented using a chaotic current mode regulator that even requires ÿ External reference voltage input, for e.g. no compensation components. A duty cycle of 100% enables the DAC control of Vout minimum possible voltage drop and therefore the best utilization ÿ ON and Sleep control-input with TTL/CMOS of components and input voltage range. Due to the external FETs threshold but accepting up to 60V any required power can be realised. The option to have an NFET as ÿ Open load stable a free wheeling diode help increases the system efficiency. With ÿ Temperature range – 40°C to + 125 ºC the ON and SLP pins the converter can be started and stopped. ÿ TSSOP24 package Due to their wide input voltage range the pins can be driven with TTL- and CMOS-level as well as CAN-controller output or a (filtered) Kl15-signals. package Name Description 1 RSEN PFM current sense comparator input RSEN 1 24 LGT 2 CLDR Supply rail input CLDR 2 23 UPG 3 CHDR High side linear regulator output CHDR 3 22 PGND 4 VS Positive analog and power stage supply input VS 4 21 GND LXT 5 20 CDLY 5 LXT Zero crossing detection ENPS 6 19 PWGD 6 ENPS Shutdown input SMON 7 18 WDI VSM 8 17 WEN 7 SMON Active-high SMON control input SGND 9 16 RSEL 8 VSM Internal linear regulator output AGND 10 15 RLEV VFB 11 14 SDLY 9 SGND Signal ground RFEX 12 13 LSDIS 10 AGND Analog ground 11 VFB Feedback input 12 RFEX External reference input 13 LSDIS Low side N-channel FET driver is active 14 SDLY Delayed restart PFM after fault, high-active 15 RLEV Internal high-reference low active 16 RSEL Reference select, low=internal, high=external 17 WEN Watchdog enable input 18 WDI Watchdog trigger input 19 PWGD Open drain output 20 CDLY Delay timing capacitor 21 GND Ground 22 PGND Power ground 23 UPG Gate driver for external high-side P-channel FET 24 LGT Gate driver for external low-side N-channel FET TSSOP24 ÿ ÿ E910.28 ÿ THIS PRODUCT IS UNDER DEVELOPMENT THIS PRODUCT IS UNDER DEVELOPMENT ÿ Step down converter, for external FET THIS PRODUCT IS UNDER DEVELOPMENT Block diagram VBAT VS LXT CHDR VLIM SMON int. ENPS Supply VSM RSEN VS UPG CLDR RFEX CHDR 0,2 V 1,22 V PWM VCMP MUX GEN Vout ANTSHT RSEL CLDR LGT RLEV PWGD WDI WEN PowerGood & WD E910.28 CDLY 36 VFB GND SDLY LSDIS PGND Note ELMOS Semiconductor AG (below ELMOS) reserves the right to make changes to the product contained in this publication without notice. ELMOS assumes no responsibility for the use of any circuits described herein, conveys no licence under any patent or other right, and makes no representation that the circuits are free of patent infringement. While the information in this publication has been checked, no responsibility, however, is assumed for inaccuracies. ELMOS does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of a life-support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications. Copyright © 2007 ELMOS Reproduction, in part or whole, without the prior written consent of ELMOS, is prohibited. www.elmos.de | [email protected] elmos product catalog 2007/2008 37