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 ÿ E 910.27 Step down converter, fully integr. E 981.03 Energy storage controller E 910.28 Step down converter, for ext. FET ÿ Step down converter, fully integrated FEATURES E910.27 APPLICATION ÿ Wide input range of 5V to 40V ÿ Automotive electronics ÿ Wide, adjustable output voltage of 1.25V ÿ Controller and sensor supply to (VIN-0.5V) ÿ LED supply ÿ Output current range of 0mA to 2.8 A peak ÿ General supply applications ÿ Fully integrated, ÿ ÿ ÿ minimum external components required DESCRIPTION Very high efficiency over the whole load The IC is developed and optimized for automotive applications current range (up to 90%) where it can be used to supply controllers, sensors, power- Very low shutdown current with internal supply off LEDs and many other devices. The reference input allows it to (12 µA typical) control the output voltage (or current) with e.g. an external DAC. Low standby current with internal supply on for fast That makes it easy to build LED-dimmer or any application that start up (<200µA typical) needs variable supply. ÿ 100% duty cycle possible ÿ Easy to use chaotic regulation behaviour For fast load and line regulation a multi-loop regulation is imple- ÿ Fast multi-loop-regulation mented using a chaotic current mode regulator which re-quires ÿ Adaptive frequency selection up to 300kHz no compensation components. ÿ No compensation necessary ÿ Reference voltage input available, for e.g. The possibility to generate a duty cycle of 100% enables the mini- DAC control of Vout mum possible voltage drop and therefore the best utilization of ON and sleep control-input with TTL threshold but components and input voltage range. With the ENPS and SMON accepting up to 40V pins the converter can be started and stopped. Due to their wide ÿ Open load stable input voltage range the pins can be driven by TTL- and CMOS- ÿ Temperature range – 40°C to + 125°C. level as well as CAN-controller output or a (filtered) Kl15 signal. ÿ TSSOP24 package ÿ PINNING PACKAGE Pin Name Description 1 RSIN1 PFM current sense comparator input 2 RSIN2 PFM current sense comparator input 3 CDRV High side linear regulator output 4 VSP Positive power stage supply input 5 VSA Positive analog power supply input 6 ENPS Shutdown input 7 SMON SMON control input, Active-high 8 VSM Internal linear regulator output 9 SGND Signal ground 10 AGND Analog ground 11 VFB Feedback input 12 RFEX External reference input 13 ERR Error output 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 WDI Watchdog trigger input 18 WEN Watchdog enable input 19 PWGD Power good, Open drain output 20 CDLY Delay timing capacitor input 21 GND Ground 22 PGND Power ground 23 SWD1 Drain output of the internal power P-MOSFET 24 SWD2 Drain output of the internal power P-MOSFET TSSOP 24 BLOCK DIAGRAM 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. 32 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 33