The SemiQ Family of DC-DC converters provides a high efficiency single output
in a size that is only 60% of industry-standard quarter-bricks, while preserving the
same pinout and functionality.
In high temperature environments, for output voltages ranging from 3.3 V to 1.0 V,
the thermal performance of SemiQ converters exceeds that of most competitors'
20 -30 A quarter-bricks. This is accomplished through the use of patent pending
circuit, packaging and processing techniques to achieve ultra-high efficiency,
excellent thermal management and a very low body profile.
Low body profile and the preclusion of heat sinks minimize airflow shadowing, thus
enhancing cooling for downstream devices. The use of 100% automation for
assembly, coupled with advanced electric and thermal design, results in a product
with extremely high reliability.
Operating from an 18-36 V input, the SQ24 Series converters of the SemiQ Family
provide any standard output voltage from 12 V down to 1.0 V. Outputs can be
trimmed from 20% to +10% of the nominal output voltage (10% for output
voltages 1.2 V and 1.0 V), thus providing outstanding design flexibility.
With a standard pinout and trim equations, the SQ24 Series converters are perfect
drop-in replacements for existing quarter brick designs. Inclusion of this converter
in new designs can result in significant board space and cost savings. The device
is also available in a surface mount package.
In both cases the designer can expect reliability improvement over other available
converters because of the SQ24 Series optimized thermal efficiency.
18-36 VDC Input; Outputs from 1-12 VDC
Available in through-hole and SM packages
Outputs available in 12.0, 8.0, 6.0, 5.0, 3.3, 2.5, 2.0, 1.8, 1.5, 1.2 & 1.0 V
High efficiency no heat sink required
On-board input differential LC-filter
Extremely low output and input ripple
Start-up into pre-biased output
No minimum load required
Fixed-frequency operation
Fully protected
Remote output sense
Output voltage trim range: +10%/20% (except 1.2 V and 1.0 V outputs
with trim range 10%) with industry standard trim equations
High reliability: MTBF of 3.4 million hours, calculated per Telcordia TR-
332, Method I Case 1
Positive or negative logic ON/OFF option
All materials meet UL94, V-0 flammability rating
Approved to the latest edition and amendment of ITE Safety standards,
UL/CSA 60950-1 and IEC60950-1
RoHS lead-free solder and lead-solder-exempted products are available
2
SQ24 Series
1 ELECTRICAL SPECIFICATIONS
Conditions: T = 25 C, Airflow = 300 LFM (1.5 m/s), Vin = 24 VDC, All output voltages, unless otherwise specified.
A
PARAMETER NOTES MIN TYP MAX UNITS
Absolute Maximum Ratings
Input Voltage Continuous 0 40 VDC
Operating Ambient Temperature -40 85 C
Storage Temperature -55 125 C
Input Characteristics
Operating Input Voltage Range 18 24 36 VDC
Turn-on Threshold 16 17 17.5 VDC
Input Under Voltage Lockout (Non-latching)
Turn-off Threshold 15 16 16.5 VDC
Isolation Characteristics
I/O Isolation 2000 VDC
1.0 - 3.3 V 160 pF
Isolation Capacitance 5.0 - 6.0 V 260 pF
8.0 V, 12 V 230 pF
Isolation Resistance 10 M
Feature Characteristics
Switching Frequency 415 kHz
Industry-std. equations (1.5 - 12 V) -20 +10 %
1
Output Voltage Trim Range
Industry-std. equations (1.0 - 1.2 V) -10 +10 %
1
Remote Sense Compensation Percent of V (NOM) +10 %
OUT
Non-latching (1.5 - 12 V) 117 125 140 %
Output Over-Voltage Protection
Non-latching (1.0 - 1.2 V) 124 132 140 %
Auto-Restart Period Applies to all protection features 100 ms
Turn-On Time 4 ms
Converter Off -20 0.8 VDC
ON/OFF Control (Positive Logic)
Converter On 2.4 20 VDC
Converter Off 2.4 20 VDC
ON/OFF Control (Negative Logic)
Converter On -20 0.8 VDC
1
Vout can be increased up to 10% via the sense leads or up to 10% via the trim function, however total output voltage trim from all sources should not
exceed 10% of V (NOM), in order to insure specified operation of over-voltage protection circuitry. See Output Voltage Adjust/Trim for detailed
OUT
information.
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