Surface-Mount Quarter-Brick Format Q24S35 Family Product Brief 18 Vdc - 36 Vdc In, 35A The Q24S35 family of surface-mountable DC/DC converters offers unprecedented performance in the industry-standard quarter-brick format. This is accomplished through the use of patent pending circuit and packaging techniques to achieve ultra-high efficiency, excellent thermal performance and very low profile. In thermal environments common to telecommunications applications, the Q Series 35A modules provide thermal performance that far exceeds all quarter-bricks and is comparable even to existing "half-bricks", and all this in a height of only 0.26". Low profile and the preclusion of heatsinks minimizes airflow "shadowing", thus enhancing cooling for down-stream devices. The use of 100% surface-mount technologies for assembly, coupled with di/dt's advanced electric and thermal circuitry and packaging, result in products with extremely high quality and reliability. The Q24S35 family is available in five standard output voltages ranging from 3.3V to 1.5V. TM OUTPUT VOLTAGE EFFICIENCY @ 20A OUTPUT CURRENT @70C, 200 LFM 3.3V 89.4% 21.0A 2.5V 88.0% 23.0A 2.0V 86.5% 25.0A 1.8V 85.2% 25.5A 1.5V 84.3% 26.5A Complete efficiency and thermal curves for each output voltage are available upon request. Applications * Telecommunications * Datacommunications * Wireless PB_Q24S35_02_12_01 Q24S35 MODULE Features * Delivers up to 35A * Delivers higher current at 70C than existing 20A and 25A modules deliver at 40C to 50C * Delivers performance comparable to Half-Bricks in telecom thermal environments * No Heatsink Required * Height Only 0.26" (6.6mm) * Power Density: 130 W/in3 * Weight: 27g (0.95oz) * High Efficiency: 89% @ 20A * Industry-Standard size: 1.45" x 2.30" * 2000V I/O Isolation * Fixed Frequency Operation * No Minimum Load Required * Fully Protected * Remote Sense * Adjustable Output Voltage: +10%/-20% * Industry-Standard external resistor values * High Reliability * Remote On/Off * UL 1950, EN 60950 (pending) USA Toll Free 866-WOW-didt Page 1 of 2 Surface-Mount Quarter-Brick Format Q24S35 Mechanical Drawing PIN CONNECTIONS PIN # FUNCTION 1 2 3 4 5 6 7 8 Vin (+) Remote On/Off Vin (-) Vout (-) Sense (-) Trim Sense (+) Vout (+) * All dimensions are in inches [mm] * Pin Finish: Gold over Nickel * Module Weight: 0.95 oz. [27 g] * Recommended Surface-Mount Pads Size: Min. .080" x .112" Max. .092" x .124" Converter Part Numbering Scheme PRODUCT SERIES INPUT VOLTAGE MOUNTING SCHEME RATED OUTPUT CURRENT Q 24 S Quarter-Brick Format 24 - (18V-36V) S - surface-mount OUTPUT VOLTAGE POS / NEG ENABLE LOGIC 35 033 P 35 - 35 Amps 033 - 3.3V 025 - 2.5V 020 - 2.0V 018 - 1.8V 015 - 1.5V P - Positive N - Negative SPECIAL FEATURES Blank - Std. The example above describes P/N Q24S35033P: 24V input voltage, surface-mount, 35A output current, 3.3V output voltage with positive enable logic. For more information please contact di/dt, Inc. 1822 Aston Avenue ** Carlsbad, CA ** 92008 ** USA USA Toll Free 866-WOW-didt (969-3438) www.didt.com ** support@didt.com The information and specifications contained in this data sheet are believed to be accurate and reliable at the time of publication. However, di/dt, Inc. assumes no responsibility for its use nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of di/dt, Inc. Specifications are subject to change without notice. Copyright (c) 2001 di/dt, Inc. PB_Q24S35_02_12_01 USA Toll Free 866-WOW-didt Page 2 of 2