PT4498—48V 20 Amp “Current Booster” for PT4484 DC/DC Converter SLTS110 (Revised 10/31/2000) • 20A Current Boost (Boosts PT4484 to 40A) • Tracks Vout of PT4484 • Synchronized Operation • High Efficiency • Input Voltage: 36V to 75V • 26-pin Copper Case Package The PT4498 is a new high-performance 20A “Current Booster” for use with the PT4484 Excalibur™ DC/DC converter. The PT4498 adds a parallel output stage to the PT4484, allowing both to operate in perfect sychronization. The PT4498 only operates with a PT4484 and is not a stand-alone product. Refer the PT4484 data sheet for the performance specifications. The booster uses the same 26-pin case and has the package options as the companion regulator. Patent pending on package assembly PT Series Suffix (PT1234X) Pin-Out Information Function Pin Function 1 +Vin Pin 10 +V out 19 -Vout 2 -Vin 11 +V out 20 -V sense 3 N/C 12 +V out 21 N/C 4 Vr 13 +V out 22 N/C 5 Va 14 -V out 23 N/C -V out 24 N/C Pin Function Case/Pin Configuration Vertical Through-Hole N Horizontal Through-Hole A Horizontal Surface Mount C Ordering Information PT4498 o 6 N/C 15 7 N/C 16 -V out 25 N/C 8 +Vout 17 -V out 26 DRV (For dimensions and PC Board layout, see Package Styles 1200, 1210 and 1215.) 9 +Vout 18 -V out Standard Application PROGRAMMING PINS VID1 VID2 VID3 VID4 REMOTE SENSE (+) 25 +VIN 1 CIN 24 22 7 PT4484 2 + 23 3 4 5 26 20 +VOUT 8 - 13 14-19 LOAD Inhibit -VIN -VOUT REMOTE SENSE (-) 4 5 26 1 CIN Input Capacitors: + 20 PT4498 2 8 - 13 14 - 19 COUT + Although not necessary for stable operation, Cin will reduce input ripple. Cin = 33µF is suggested. Output Capacitors: A minimum of 330µF per PT4498 booster module is required for proper operation. Increasing Cout will reduce transients due to large and/or fast load steps. For technical support and more information, see inside back cover or visit www.ti.com/powertrends IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer’s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI’s publication of information regarding any third party’s products or services does not constitute TI’s approval, warranty or endorsement thereof. Copyright 2000, Texas Instruments Incorporated