DATASHEET EL7554 FN7360 Rev 5.00 Monolithic 4A DC/DC Step-Down Regulator November 5, 2007 The EL7554 is a full-feature synchronous 4A step-down Features regulator capable of up to 96% efficiency. This device Integrated MOSFETs operates from 3V to 6V V input supply. With internal CMOS IN power FETs, the device can operate at up to 100% duty ratio, 4A continuous output current allowing for output voltage range from 0.8V up to nearly Up to 96% efficiency V .The adjustable high switching frequency of up to 1MHz IN All ceramic capacitors enables the use of small components, making the whole converter occupy less than 0.58 square inch with components Multiple supply start-up tracking on one side of the PCB. The EL7554 operates at constant Built-in 5% voltage margining frequency PWM mode, making external synchronization possible. The EL7554 features soft-start and full start-up 3V to 6V input voltage control, which eliminates the in-rush current and enables 2 0.58 in footprint with components on one side of PCB users to control the start-up of multiple converters to any configuration with ease. The EL7554 also offers a 5% Adjustable switching frequency to 1MHz voltage margining capability that allows raising and lowering Oscillator synchronization possible of the supplies derived from the EL7554 to validate the 100% duty ratio performance and reliability of system cards quickly and easily during manufacturing testing. A junction temperature indicator Junction temperature indicator conveniently monitors the silicon die temperature, saving Over-temperature protection designers time in the tedious thermal characterization. Internal soft-start An easy-to-use simulation tool is available for download and can be used to modify design parameters such as switching Variable output voltage down to 0.8V frequency, voltage ripple, ambient temperature, as well as Power-good indicator view schematics waveforms, efficiency graphs, and 28 Ld HTSSOP package complete BOM with Gerber layout. Pb-free available (RoHS compliant) The EL7554 is available in a 28 Ld HTSSOP package and is specified for operation over the -40C to +85C temperature Applications range. Point-of-regulation power supplies Ordering Information FPGA Core and I/O supplies TEMP. DSP, CPU Core, and IO supplies PART PART RANGE PKG. NUMBER MARKING (C) PACKAGE DWG. Logic/Bus supplies EL7554IRE* 7554IRE -40 to +85 28 Ld HTSSOP MDP0048 Portable equipment EL7554IREZ* 7554IREZ -40 to +85 28 Ld HTSSOP MDP0048 (See Note) (Pb-free) Related Documentation *Add -T7 or -T13 suffix for tape and reel. Please refer to TB347 for Technical Brief 418 - Using the EL7554 Demo Board details on reel specifications. Easy to use applications software simulation tool available NOTE: These Intersil Pb-free plastic packaged products employ at www.intersil.com/dc-dc special Pb-free material sets molding compounds/die attach materials and 100% matte tin plate PLUS ANNEAL - e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. FN7360 Rev 5.00 Page 1 of 14 November 5, 2007EL7554 Typical Application Diagram C C R C 1 COMP SGND 28 220pF 0.018F 2.32K R 2 2 VREF COSC 27 10.2K 0.018F C OSC 3 FB STN 26 R 1 12.7K 4 VO STP 25 0.22F 5 VTJ EN 24 6 TM PG 23 7 SEL VDD 22 V 8 LX VIN 21 IN (3V TO 6V) 2.2H 9 LX VIN 20 V OUT (1.8V, 4A) 2x10F 10 LX VIN 19 C OUT C IN 47F 11 LX PGND 18 12 LX PGND 17 13 LX PGND 16 14 NC NC 15 FN7360 Rev 5.00 Page 2 of 14 November 5, 2007