GND 0.3VDC to GND + 2.5VDC. GND 0.3VDC to V IN + 0.3VDC

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1 56000 DC/DC Non-Isolated Point of Load Converter PRODUCT PREVIEW Product Status: This document contains information on a product under development. Micropac reserves the right to change or discontinue this product without notice. Features: Radiation Tolerant Non-Isolated DC-DC Point of Load Power Converter o TID 100k rad(si)/s o ELDRS TID 50K rad 10mrad(Si)/s o SET LET 86.4 MeV/mg/cm 2 Input Voltage Range 3.0 to 5.5 VDC High efficiency up to 93% 3.3V input; with output externally trimmed between 0.8 to 1.8V 5.0V input; with output externally trimmed between 0.8 to 3.3V Maximum 6 Amps with internal over-current protection Power good signal Programmable soft start Two or more converters synchronize for out-of-phase operation Wide case temperature range -55 C to +125C; extended temperature to 175 C Test points provided to measure gain and phase margins Description: Applications: The DC/DC converter is designed to provide up to Satellite/Space Systems 6A output current at voltages from 0.8 to 3.3 volts at Military/High Reliability Systems +125 C. The power controller is a TID and SEE hardened High Temperature Downhole Tools buck regulator utilizing common input, output, and case FPGA, DSP, microcontroller power grounds for non-isolated applications. The controller uses peak current-mode control with integrated compensation and switches the integrated synchronous MOSFETs at a fixed frequency of 1 MHz. The baseplate is used as the heat sink for optimum thermal performance. These converters are intended for use in programs requiring tight control of low voltage supplies in high radiation, wide temperature, and high reliability systems. Enable input for direct output control Power good signal indicates stable & acceptable regulation Free run at 1 MHz or synchronize to external 1 MHz ±20% Programmable soft start 2 to 200 ms Input undervoltage lockout for low supply voltage protection Output undervoltage protection from shorted loads Output overcurrent shutdown and automatic restart Automatic restart after fault detected Shock and vibration resistant package Screened to MIL-PRF Class H and K RHA Pending ABSOLUTE MAXIMUM RATINGS Input Voltage V IN, P GOOD pin GND 0.3VDC to GND + 5.7VDC M/S, SYNC, ENA, POR SEL pins GND 0.3VDC to V IN + 0.3VDC Soft Start pin GND 0.3VDC to GND + 2.5VDC Output Current 11 Amps Soldering Temperature 300 C for 10 seconds Storage Temperature Range -65 C to +200 C Operating Case Temperature Range -55 C to +175 C Power Dissipation, Tc = +125 C 6.6 W Thermal Resistance 4.0 C/W Junction-to-Case (θ J-C ) Weight (Estimated) 30.0 grams Stresses above the absolute maximum rating may cause permanent damage to the device. Extended operation at the maximum levels may degrade performance and affect reliability sales@micropac.com 11/10/2014 Rev H Pg. 1 of 9

2 ELECTRICAL SPECIFICATIONS PRE - RADIATION TC = -55 C to +125 C, unless otherwise specified. Parameter Symbol Test Conditions Min. Typ. Max Units Power Supply Section Input Voltage V IN VDC Input current, no load I IN I L =0.0A, V IN =3.3V, V OUT =0.8V 65 ma Input Ripple Current Output Voltage I IN RIPPLE I L =6.0A, V IN =3.3.0V, V OUT =0.8V, BW=20Hz to 20MHz 50 ma p-p Output Voltage V OUT Any line, any load VDC Output Current I OUT A Output Ripple Voltage V RIPPLE I L =6.0A, BW=20Hz to 20MHz 30 mv p-p Startup Time T START SS pin open 10 ms Step Load Response V STEP I L =0 to/from 6A 115 mv Recovery time t REC I L =0 to/from 6A 200 µs Efficiency Oscillator Section η I L =3.0A, V IN =3.3V, V OUT =0.8V 83 % I L =3.0A, V IN =5.0V, V OUT =3.3V 93 % Switching Frequency F SW M/S=V IN MHz External Frequency F EXT M/S=GND MHz Master/slave (M/S) input voltage Power ON Reset M/S V IH Input high threshold V IN 0.5 V M/S V IL Input low threshold 0.5 V POR input voltage, High POR HI Rising threshold, POR SEL =V IN 4.25 V POR input voltage, High POR LOW Rising threshold, POR SEL =GND 2.80 V Enable (EN) input voltage Power Good Signal Power Good rising threshold Power Good falling threshold Over Current Monitor EN THR Rising/Falling threshold 0.60 V PR RISE V OUT as a % of V NOM 111 % PR FALL V OUT as a % of V NOM 89 % Overcurrent trip level OC TRIP A Pg. 2 of 9

3 ELECTRICAL SPECIFICATIONS TC = -55 C to +175 C, unless otherwise specified. Parameter Symbol Test Conditions Min. Typ. Max Units Power Supply Section Input Voltage V IN TBD TBD VDC Output Voltage Section Output Voltage V OUT I L =TBD A TBD 0.80 TBD VDC Output Current I OUT 0 TBD A Startup Time T START SS pin open TBD ms Recovery time t REC 50% to/from 100% load TBD µs Efficiency Oscillator Section η I L =3.0A, V IN =3.3V, V OUT =0.8V TBD % I L =3.0A, V IN =5.0V, V OUT =3.3V TBD % Switching Frequency F SW M/S=V IN 1.0 MHz Power ON Reset Section POR input voltage, High POR HI Rising threshold, POR SEL =V IN TBD V POR input voltage, High POR LOW Rising threshold, POR SEL =GND TBD V Enable (EN) input voltage EN THR Rising/Falling threshold TBD V Power Good Signal Section Power Good rising threshold PR RISE V OUT as a % of V NOM TBD % Power Good falling threshold PR FALL V OUT as a % of V NOM TBD % Over Current Monitor Overcurrent trip level OC TRIP TBD TBD TBD A 1. Output voltage may be adjusted upward from the factory preset value of 0.80 Volt to an output voltage specified in Table 1 for fixed R Trim values. Alternately, output values may also be set utilizing the formula in Table 1. Table 1 Input Voltage (V) Output Voltage (V out ) R TRIM (Ohms) R TRIM = 1800 (3V OUT - 2.4) Ohms Pg. 3 of 9

4 Block Diagram Application Circuit The diagram below shows the circuit connections needed to use the converter in the application. It is configured as a standalone device for 5.0V input to begin running when power is applied. The Power Good output can be monitored to determine when the output voltage is within the acceptable output range or left disconnected if not used. In the simplest application the converter is wired the same as a three-terminal regulator. Pg. 4 of 9

5 Design Note A well damped low pass input filter can be used to precede the DC-DC converter. Its main function is to prevent converter generated signals from being conducted either back into the source or out into the load. To reduce its adverse impact on the converter loop stability and reliability, good filter design practice should be adhered to and should take into account the input source impedance, the corner frequency of the filter, and the overall loop cross-over frequency of the converter. Typically, the corner frequency of the filter should be less than the converter clock frequency and equal to or higher than the loop cross-over frequency. This device requires adequate heatsinking based upon the expected power dissipation. The user is cautioned to provide the heatsink prior to application of power. Typical Performance Plots Frequency Response V IN =3.3V, V OUT Phase Margin (Φ M ) = 45 Pg. 5 of 9

6 V IN =5.0V, V OUT = 6A Phase Margin (Φ M ) = 89 Load Transient Response Pg. 6 of 9

7 Pinout Information PINOUT DESCRIPTION 1. V IN Supply input 2. V IN Supply input 3. GND Input/Output ground, Output ground, case ground, and heatsink 4. GND Input/Output ground, Output ground, case ground, and heatsink 5. P GOOD Power good indication when HIGH through pull-up resistor 6. Soft Start Soft Start 7. Master-Slave Select Master (HIGH)/Slave (LOW) synchronization 8. SYNC Sync output / input 9. MSTR_EN Master Enable 10. POR SEL Select 3.3 or 5.0 V input for power on threshold 11. EN Enable input 12. V TRIM Output Voltage Pin Adjust 13. FB Feedback Voltage 14. Output Regulated Output Voltage 15. GND Output/Input ground, Output ground, case ground, and heatsink 16. GND Output/Input ground, Output ground, case ground, and heatsink 17. GND Output/Input ground, Output ground, case ground, and heatsink 18. V OUT Regulated Output Voltage 19. V OUT Regulated Output Voltage 20. V OUT Regulated Output Voltage Pg. 7 of 9

8 Packaging Information Pg. 8 of 9

9 Ordering Information Part Number Output Voltage (Untrimmed) Operating Temperature Range Quality Level ST-H 0.8VDC -55 C to +125 C MIL-PRF-38534, Class H ST-K 0.8VDC -55 C to +125 C MIL-PRF-38534, Class K 2. Screened to Table C-IX of MIL-PRF Class H or Class K. Pg. 9 of 9