REFGND VREF SLOPE ADJ GND End of Life QPO-2 QUIETPOWER QPO-2 Low Voltage Output Ripple Attenuator Description Features of the QPO-2 The QPO-2 output ripple attenuator SiP uses active >30 dB PARD attenuation, 1 kHz to 500 kHz filtering to reduce supply output ripple and noise (PARD) >20 dB PARD attenuation, 50 Hz to 500 Hz (1) by over 30 dB from 1 kHz to 500 kHz. The QPO-2 is biased through the VAUX input and filters an input voltage 20 A rating over a 0.3-5.5 Vdc operating range range of 0.3 Vdc to 5.5 Vdc while supporting load currents Supports precise point-of load regulation as high as 20 A. The VAUX input range is 7 V to 12 V with 90-95% efficiency with load vs. headroom trim a minimum required difference between VAUX and QPO OUT of 7 V. Output regulation is maintained by using User selectable performance optimization of the either the remote sense or the trim adjustment of the attenuation, power dissipation & transient load power supply. The product can be used in an open loop response configuration when ripple and noise reduction are the Peak detector function optimizes headroom for main objective and load regulation is not as critical. The ripple amplitude variation automatically QPO-2 architecture improves transient response and ensures quiet point-of-load regulation when used with 25 x 25 x 4.5 mm SiP (System-in-a-Package) most switching power supplies. The performance Low profile LGA package waveform in figure 2 is an example of the ripple reduction and transient load improvement the QPO-2 can Closed loop control improves transient response provide using a 3.3V brick style converter. of most DC-DC converters and power supplies Reduces required number of output capacitors to support dynamic loads. Applications Distributed Point of Load Power Systems Patents Pending Sensors Requiring Low Noise Power Note 1: For off-line supplies 20 dB attenuation can be achieved Medical Instrumentation down to 50 Hz with additional capacitance added from the VREF pin to REFGND. VAUX QPO IN (AC) VAUX LOAD+ QPO IN QPO OUT VOUT+ PEAK IN CIN* SENSE+ RCP Rsc QPO-2L RCLAMP RSL SC SET ADJUST +TRIM QPO OUT (AC) CSC RSA LOAD CURRENT SENSE- RHR VOUT- *Optional LOAD- Figure 1 ADJUST/Trim supports applications that dont Figure 2 Typical performance with a 3.3 Volt converter, showing require remote sense. 1 to 10 A load step. Picor Corporation www.picorpower.com QPO-2 Data Sheet Rev. 1.6 Page 1 of 11GND SLOPE ADJ RCLAMP VREF REFGND VAUX End of Life Absolute Maximum Ratings Exceeding these parameters may result in permanent damage to the product. Pins Parameter Notes Min Max Units VAUX to Gnd Input voltage Continuous -0.5 13.2 Vdc All others to Gnd REFGND Input voltage Continuous -.05 6 Vdc VAUX to Gnd Input bias current 50 mAdc QPOin to QPOout Input to output current 10 seconds 25C 25 Adc Package Power dissipation Pd= ILoad x Vhr 4 W Package Operating temperature PCB to QPO Interface -40 100 C Package Thermal resistance Free Air 50 C/W Package Thermal resistance PCB Layout Fig. 12 12 C/W Package Storage temperature -40 125 C (4) Package Re-flow temperature 20 second exposure 212 C Electrical Characteristics Parameter limits apply over the operating temp. range unless otherwise noted. Symbol Parameter Notes Min Max Units (2) ILoad Operating load current range No Internal Current Limit 0.01 (3) 20 Adc VQPOOUT Output voltage range Continuous 0.3 5.5 Vdc VHR Headroom voltage range See Applications Detail For Setting 75 425 mVdc IAUX VAUX input current 10 20 mA Vtout Transient response-step load Vhr=375mV Cin=200uF change of 10A <1A/usec Iload=1A t=0 See Figure 2 example 50 mVdc Vnout Output noise Input PARD=100mVpp 50-500kHz Cvref=25uF 10 mVpp 5 mVrms Iscout SC output current accuracy See applications detail for setting -2 +2 % Iscout SC output source current Input current from QPOIN to Gnd 10 mA Note 2: User must protect the load path and limit the steady state load current to be less than the absolute maximum of 20 Amps. Note 3: User must provide a minimum load current of greater than 10mA at the output of the QPO-2. Note 4: RoHS compliant product maximum peak temperature is 245C for 20 seconds. Pad Descriptions LGA Pattern Pad Number Name Description 1, 19, 20 GND Input ground 2 SLOPE ADJ RSA resistor connection allows setting of 910 11 12 the slope of headroom voltage vs. load (mV/A) 8 13 3 VREF Input to the active filter, setting the QPO IN output voltage at the QPOOUT pins QPO OUT 17 18 7 14 4 REFGND Ground reference for the VREF pin (critical low noise connection) 6 15 PEAK IN 5 SC SET Rsc resistor connection allows setting of 20 19 the SC/trim current applied to the 5 16 SC SET ADJUST converter trim input. 1 4 3 2 6, 7, 8, 17 QPOOUT Output pins 9 VAUX Input bias voltage 10 RCLAMP External resistor to program VREF quick-charge level at start-up 11, 12, 13, QPOIN Input pins (critical thermal path to remove 14, 18 heat from the package, see PCB suggested layout Fig.13) 15 PEAK IN Ripple Peak Detector Input 16 ADJUST A current source that mirrors the current through RSC and drives a converters SC/TRIM pin. Picor Corporation www.picorpower.com QPO-2 Data Sheet Rev. 1.6 Page 2 of 11