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High Power Density DC/DC Conversion Solution - SP7656 PowerBlox

The SP7656 PowerBlox is a single-stage, high power density DC/DC conversion solution in a space-saving SOIC-8 package. It offers improved efficiency, lower cost, and reduced radiated noise for AC/DC applications. With a higher input voltage advantage, it provides superior performance for bussing higher VDC.

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High Power Density DC/DC Conversion Solution - SP7656 PowerBlox

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  1. SP7656 30V Input 3A PowerBlox DC/DC In Space Saving SOIC-8 Power Package Single Stage High Power Density DC/DC Conversion

  2. Exar Higher Input Voltage Advantage Bussing Higher VDC is Superior for: AC/DC Improved Efficiency AC/DC Lower Cost Lower Radiated Noise Reduced Mass for Cable & Connector 7V 22V 7V Output 50W AC/DC 80% Efficiency (10W Loss) $3.00 22V Output 50W AC/DC 88% Efficiency (6W Loss) $2.00

  3. Exar DCDC Single Stage Conversion Exar dc/dc controllers have ability to perform high conversion ratios at very high efficiency (N = Po/Pi) Single stage conversion can improves overall system efficiency and reduces solution cost DC/DC DC/DC AC/DC N=92% N=94% N=80% 2.5V 12V 5V Load AC Typical System Efficiency (N) = 0.80x 0.92 x 0.94 = 69% Typical BOM = 2 Inductors + 4 Caps + 2 ICs + 22 Discretes DC/DC AC/DC DC/DC 22V 2.5V N=90% N=88% AC Exar Load System Efficiency (N) = 0.88 x 0.90 = 79% Typical BOM = 1 Inductor, 2 Caps, 1IC + 11 Discretes

  4. System Power Conversion Example 2.5V/7.5W (3A Core) 22V 22V 40W 12V 5V AC 88% 82% 90% DSP (83%) 92% 92% 40W 35W 3.3V/3.3W (1A IO) 92% DDR2 (83%) 92% BOM = 6 Switching Regs (12 Caps, 6 Inductors, 6 ICs) 2.5V/5W (2A) BOM = 5 Switching Regs (10 Caps, 5 Inductors, 5 ICs) 92% COM (83%) 92% 2.5V/2.5W (1A) DC/DC Power Lost = 4.8W DC/DC Power Lost = 2.3W 1.8V/7W (4A Core) 92% FPGA (83%) 92% 3.3V/3.3W (1A IO) Overall System Efficiency Improved 10% Overall Cost Reduced $0.80  $1.20 Using SP6133

  5. Controller & PowerBlox Products Existing Controllers SP6132/34/37: 28Vin capable, but requires ext 5V Bias SP6133/36/38: 24Vin, full feature with OCP, Sense FB SP6125/26/27: 30Vi, small package, flexible (2-3A Apps) Low Duty Cycle Capability (Fast FET drive) Existing PowerBlox Regulators SP765x: (6132/34/27) SP766x: (SP6133/36/38) Higher Efficiency With Superior Thermal Capability NEW 5

  6. SP7656 Non-Synch PowerBlox

  7. SP7656 PowerBlox Superior Solution Single Chip Monolithic DC/DC PowerBloxTM DC/DC All External Compensation Parts Typ Switch Resistance = 100mΩ Typ Output Current = 1A3A Eff at 12Vin = 84% @3A At 5Vo part heats 2.4W Chip Heats 120ºC Above Room TJ=145ºC (Beyond 125ºC Limit) Integrates Type-II Compensation Typ Switch Resistance = 60 mΩ Typ Output Current = 1A4A Eff at 12Vin = 88%@3A At 5Vo part heats 1.8W At 50ºC/W, Chip = TA+90ºC TJ=115ºC (Under 125ºC Limit) 7

  8. SP7656 Special Features Smallest PowerBlox Package Ever Released Reduces BOM/PCB Area Over Competition Internal Compensation Reduces Part Count Reduces BOM/PCB Area Over Competition Faster Speed of 600kHz Means Smaller Inductor and Reduced Capacitor Requirement Most competing higher Vin devices are 200-300kHz Highly Accurate 1% Output Set-Point This is demanded by DSP, FPGA, ASIC Cores Internal Soft Start & Adjustable Current Limit Features Usually Found in 16-Pin Parts

  9. SP7656 Behavior Note Architecture optimized for wide ratio conversions for low output voltages (5V1.2V, 5V0.9V) and either low or high ratio for high output voltages (28V 15V, 24V12V, 12V5V) When converting low ratio with Vout <9V (5V3.3V) the clock will go into ½ frequency skipping mode Adds a small amount of extra output noise (20mV out of a 3,300mV Vout voltage) while actually improving power conversion efficiency

  10. SP7656 Target Functions High Output Current Low Voltage POL Power Capable of Output Voltages Down to 600mV Wide Conversion Ratio, can exceed 15:1 Guaranteed 1% Output accuracy for High End FPGA/DSP Vcore Also can handle loosly regulated intermediate bus voltages off isolated secondaries 18V may be 9V27V 12V may be 6V to 18V

  11. SP7656 3.3V Output Demo Platform SP6153EB

  12. SP7656 Target Markets • Enterprise Servers • High End POS Systems • Office Automation Products • Set Top Box (PVR/DVR) • Industrial Automation & Control • Datacommunications Routers • High End Consumer 12

  13. Switching DC/DC Products Roadmap SP817x 40V Non-Synchronous 2A/3A Buck Regulators SOIC8 PowerPak SP6651/53/55 6Vin PFM Regs High Efficiency to 1A Dual Output Buck Embedded WiMax PA Driver Monolithic SP6669 6Vin PWM Buck Reg High Speed to 600mA Low Output Ripple SP6652/59/69 6Vin PWM Regs High Speed to 1A Dual Output HV Boost HV WiMax PA Driver 300mA Charge Current SP6132H/34H/ 28Vin PWM Synch Buck Controllers SP6153 32V Synch Ctlr Wide Range OCP, FreqSynch Pins SP6133/36/38 22Vin PWM Synch 300/600/2500KHz SP617x 100V Synchronous Buck Controllers SP616X/ Family 40V Synchronous Buck Controllers Controllers SP614x Family 5V Input Low Cost Synch Controller With Vtt Track SP6125/26/27 30Vin NonSynch 300/600/900kHz SP765X/SP766X NEW MOSFET DFN-28 PowerBlox 40V Input PowerBlox 2A-4A SP7650/51/2/53/55 To 28Vin, 3A/6A/8A Output 300/600/900/1300kHz 7x7mm DFN-28 SP7667/8/9 1MHz/2MHz Synch 1 DAP HTSSOP 4A/6A Versions 100V Input 2A Poweblox PowerBlox (3A-12A) SP7661/62/63 22Vin, 3A/6A/12A Output 300/600kHz 7x7mm DFN-28 Programmable OCP SP7664/5/6 7x7mm HTSSOP LeadedPackage 6A/8A/10A Add Freq Synch SP776x 40V Based Synch 300kHz HTSSOP 4A/8A 2007CY 2008CY 2009CY 2010CY Production Sampling Planned Proposing/Evaluating 13

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