The new high performance 35A QME48T35120 DC-DC converter provides a high efficiency single output, in a 1/4 brick package. Specifically designed for operation in systems that have limited airflow and increased ambient temperatures, the QME48T35120 converter utilizes the same pin-out and Input/Output functionality of the industry-standard quarter-bricks. In addition, a baseplate feature is available (-xxxBx suffix) that provides an effective thermal interface for coldplate and heat sinking options. The QME48T35120 converter thermal performance is accomplished through the use of patent-pending circuits, packaging, and processing techniques to achieve ultra-high efficiency, excellent thermal management, and a low-body profile. Low-body profile and the preclusion of heat sinks minimize impedance to system airflow, thus enhancing cooling for both upstream and downstream devices. The use of 100% automation for assembly, coupled with advanced electronic circuits and thermal design, results in a product with extremely high reliability. Operating from a wide-range 36-75V input, the QME48T35120 converter provides a fully regulated 12.0V output voltage. Employing a standard power pin-out, the QME48T35120 converter is an ideal drop-in replacement for existing high current quarter-brick designs. Inclusion of this converter in a new design can result in significant board space and cost savings. The designer can expect reliability improvement over other available converters because of the QME48T35120 optimized thermal efficiency. RoHS lead-free solder and lead-solder-exempted products are available Delivers up to 35 A (420 Watts) Industry-standard quarter-brick pinout On-board input differential LC-filter Startup into pre-biased load No minimum load required Meets Basic Insulation requirements of EN60950-1 Withstands 100 V input transient for 100 ms Fixed frequency operation Fully protected (OTP, OCP, OVP, UVLO) with automatic recovery Positive or negative logic ON/OFF option Low height of 0.430 (10.4mm) Weight: 1.75 oz (49.6g), 2.15 oz (61.0g) w/baseplate High reliability: MTBF approx. 18.8 million hours, calculated per Telcordia TR-332, Method I Case 1 Approved to the latest edition and amendment of ITE Safety standards, UL/CSA 60950-1 and IEC60950-1 Designed to meet Class B conducted emissions per FCC and EN55022 when used with external filter All materials meet UL94, V-0 flammability rating 2 QME48T35120 Conditions: T = 25C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified. A PARAMETER CONDITIONS / DESCRIPTION MIN TYP MAX UNITS Absolute Maximum Ratings Input Voltage Continuous 0 80 VDC Input Transient Voltage 100 ms 100 VDC Operating Ambient Temperature (T ) -40 85 C A Operating Component Temperature (T ) -40 125 C C Operating Baseplate Temperature (T ) -40 105 C B Storage Temperature -55 125 C Input Characteristics Operating Input Voltage Range 36 48 75 VDC Turn-on Threshold 31.5 34 35.5 VDC Input Under Voltage Lockout (Non-latching) Turn-off Threshold 30 33 34.5 VDC Lockout Hysteresis Voltage 0.5 2 VDC Input Voltage Transient Rate 7 V/ms Maximum Input Current 35 ADC, 12 VDC Out 36 VDC In 12.3 ADC Input Stand-by Current Converter disabled 10 mADC Input Current No Load Converter enabled 95 mADC Minimum Input Capacitance (external) ESR < 0.7 150 F 2 Inrush Transient 0.1 A S Input Reflected-Ripple Current, ic 1250 mA PK-PK 25 MHz bandwidth, Io = 35 Amperes Input Reflected-Ripple Current, iS 100 mAPK-PK (Figure 39) Input Voltage Ripple Rejection 120 Hz 45 dB Output Characteristics 1 Output Voltage Set Point (no load) 11.76 12.00 12.24 VDC 1 Output Regulation Over Line Vin = 39 to 75VDC I = 35Amps 60 120 mV OUT Over Load 60 120 mV 2 Over line (39 to 75VDC), load and temp. 11.64 12.36 VDC 1 Output Voltage Range 2 Over line (36 to 75VDC), load and temp. 11.00 12.36 VDC IOUT = 35Amps 100 150 mVPK-PK Output Ripple and Noise 20 MHz bandwidth CEXT =10 F tantalum + 1 F ceramic 60 mVrms suffix xxxBx CEXT 0 20,000 F suffix xxxBx ESR 1.000 m External Load Capacitance (Resistive load) suffix xxxBxS377 CEXT 270 7000 F suffix xxxBxS377 ESR 1.7 m Output Current Range 35 ADC Current Limit Inception Non-latching 110 143 %Iomax 3 Peak Short-Circuit Current Non-latching, Short = 10 m 55 70 A RMS Short-Circuit Current Non-latching 5 Arms tech.support psbel.com