The new high performance 20 A SQL48T20033 DC-DC converter provides a high efficiency single output, in a 1/8th brick package that is only 62% the size of the industry-standard quarter-brick. Specifically designed for operation in systems that have limited airflow and increased ambient temperatures, the SQL48T20033 converter utilizes the same pin-out and Input / Output functionality of the industry-standard quarter-bricks. In addition, a heat spreader feature is available (-xxxBx suffix) that provides an effective thermal interface for coldplate and heat sinking options. The SQL48T20033 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 36-75 V input, the SQL48T20033 converter provides a fully regulated 3.3 V output voltage. The outputs can be trimmed from 20% to +10% of the nominal output voltage, thus providing outstanding design flexibility. Employing a standard power pin-out, the SQL48T20033 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 SQL48T20033s optimized thermal efficiency. 36-75 VDC Input 3.3 VDC 20 A Output with no derating up to 70C ( 48 Vin, 100 LFM) Withstands 100 V input transient for 100ms Fixed-frequency operation On-board input differential LC-filter Start-up into pre-biased load No minimum load required Fully protected (OTP, OCP, OVP, UVLO) Remote output sense Positive or negative logic ON/OFF option Output voltage trim range: +10%/20% with Industry Standard trim equations Low height of 0.375 (9.5 mm) Approved to the latest edition of the following standards: UL/CSA60950-1, IEC60950-1 and EN60950-1. All materials meet UL94, V-0 flammability rating RoHS lead-free solder and lead-solder-exempted products are available Telecommunications, Data communications / processing, LAN/WAN, Servers, Workstations END OF LIFE2 SQL48T20033 Conditions: TA = 25 C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified. PARAMETER CONDITIONS / DESCRIPTION MIN TYP MAX UNITS Absolute Maximum Ratings Continuous -0.3 80 VDC Input Voltage Transient (100ms) 100 VDC 1 Ambient (TA) -40 85 C Operating Temperature Component (T ) -40 120 C C (See Derating Curves) Baseplate (TB) -40 105 C Storage Temperature -55 125 C Isolation Characteristics I/O Isolation 2,250 VDC Isolation Capacitance 270 pF Isolation Resistance 10 M Input to Baseplate 1,500 VDC Output to Baseplate 1,500 VDC Feature Characteristics Switching Frequency 445 kHz 2 3 Output Voltage Trim Range Industry-std. equations -20 +10 % 2, 4 Remote Sense Compensation Percent of V (NOM) +10 % OUT Output Overvoltage Protection Non-latching 120 140 % Over Temperature Shutdown Non-latching 125 C Auto-Restart Period Applies to all protection features 200 ms Time from UVLO to Vo = 90%VOUT(NOM) Turn-On Time from Vin 5 20 ms Resistive Load Time from ON to Vo = 90% V (NOM) OUT Turn-On Time from ON/OFF Control 5 20 ms Resistive Load Converter Off (logic low) -20 0.8 VDC ON/OFF Control (Positive Logic option) Converter On (logic high) 2.4 20 VDC Converter Off (logic high) 2.4 20 VDC ON/OFF Control (Negative Logic option) Converter On (logic low) -20 0.8 VDC Input Characteristics Operating Input Voltage Range 36 48 75 VDC Turn-on Threshold 31.5 33.5 35.5 VDC Input Undervoltage Lockout Turn-off Threshold 30 32 34 VDC Lockout Hysteresis Voltage 1.0 2.0 VDC 1 Reference Figure H for component (T and T ) locations. C B 2 Vout can be increased up to 10% via the sense leads or up to 10% via the trim function. However, the total output voltage trim-up should not exceed 10% of V (NOM). OUT 3 Trim equations are defined within this documents Operations section. 4 When using remote sense a minimum of 100uF ceramic capacitance should be mounted between Vout(+) and Vout(-) close to pin 8 and pin 4. tech.support psbel.com END OF LIFE