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Technical content

Datasheet sections

Features

 High Efficiency ZVS-Buck Topology  Wide input voltage range of 8V to 36V  Very-Fast transient response  High accuracy pre-trimmed output voltage  User adjustable soft-start & tracking  Power-up into pre-biased load (select versions)  Parallel capable with single wire current sharing  Input Over/Under Voltage Lockout (OVLO/UVLO)  Output Overvoltage Protection (OVP)  Over Temperature Protection (OTP)  Fast and slow current limits  -40°C to 125°C operating range (TJ)  Optional I2C functionality & programmability:  Vout margining  Fault reporting  Enable and SYNCI pin polarity  Phase delay (interleaving multiple regulators)

Applications

 High efficiency systems  Computing, Communications, Industrial, Automotive Equipment  High voltage battery operation

Package Information

 10mm x 14mm x 2.6mm LGA SiP I2C is a trademark of NXP Semiconductors

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 3 of 26 PI33XX-X1 Order Information Cool-Power Output Range Iout Max Package Transport Media Set Range PI3311-01-LGIZ 1.0V 1.0 to 1.4V 15A 10mm x 14mm 123-pin LGA TRAY PI3318-01-LGIZ 1.8V 1.4 to 2.0V 15A 10mm x 14mm 123-pin LGA TRAY PI3312-01-LGIZ 2.5V 2.0 to 3.1V 15A 10mm x 14mm 123-pin LGA TRAY PI3301-01-LGIZ 3.3V 2.3 to 4.1V 15A 10mm x 14mm 123-pin LGA TRAY I2C Functionality & Programmability PI3311-21-LGIZ 1.0V 1.0 to 1.4V 15A 10mm x 14mm 123-pin LGA TRAY PI3318-21-LGIZ 1.8V 1.4 to 2.0V 15A 10mm x 14mm 123-pin LGA TRAY PI3312-21-LGIZ 2.5V 2.0 to 3.1V 15A 10mm x 14mm 123-pin LGA TRAY PI3301-21-LGIZ 3.3V 2.3 to 4.1V 15A 10mm x 14mm 123-pin LGA TRAY

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 4 of 26 PI33XX-X1 Absolute Maximum Ratings VIN -0.7V to 36V VS1 -0.7 to 36V, -4V for 5ns SGND 100mA PGD, SYNCO, SYNCI, EN, EAO, ADJ, TRK, ADR1, ADR2, SCL, SDA -0.3V to 5.5V / 5mA VOUT, REM PI3311-X0-LGIZ -0.3V to 5.5V PI3318-X0-LGIZ -0.5V to 9V PI3312-X0-LGIZ -0.8V to 13V PI3301-X0-LGIZ -1.0V to 18V Storage Temperature -65°C to 150°C Operating Junction Temperature -40°C to 125°C Soldering Temperature for 20 seconds 245°C ESD Rating 2kV HBM Notes: At 25°C ambient temperature. Stresses beyond these limits may cause permanent damage to the device. Operation at these conditions or conditions beyond those listed in the Electrical Specifications table is not guaranteed. All voltage nodes are referenced to PGND unless otherwise noted. Test conditions are per the specifications within the individual product electrical characteristics. Block Diagram Figure 1: Simplified Block Diagram (I2C pins SCL, SDA, ADR0, and ADR1 only active for PI33XX-21 device versions)

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 5 of 26 PI33XX-X1 PGD EAO EN REM VS1 Block 4 VIN Block 3 PGND Block 2 SYNCI SYNCO NC SGND ADJ TRK SDA SCL ADR0 ADR1 K J H G F E D C B A 13 125 4 31 142 10 9 8 7 611 SGND Block 1 VOUT Block 5 NC Pin Description Name Number Description SGND Block 1 Signal ground: Internal logic ground for EA, TRK, SYNCI, SYNCO, ADJ and I2C (options) communication returns. SGND and PGND are star connected within the regulator package. PGND Block 2 Power ground: VIN and VOUT power returns VIN Block 3 Input voltage: and sense for UVLO, OVLO and feed forward ramp VOUT Block 5 Output voltage: and sense for power switches and feed-forward ramp VS1 Block 4 Switching node: and ZVS sense for power switches PGD A1 Parallel Good: Used for parallel timing management intended for lead regulator. EAO A2 Error amp output: External connection for additional compensation and current sharing. EN A3 Enable Input: Regulator enable control. Asserted high or left floating – regulator enabled; Asserted low, regulator output disabled. Polarity is programmable via I2C interface. REM A5 Remote Sense: High side connection. Connect to output regulation point. ADJ B1 Adjust input: An external resistor may be connected between ADJ pin and SGND or VOUT to trim the output voltage up or down. TRK C1 Soft-start and track input: An external capacitor may be connected between TRK pin and SGND to decrease the rate of rise during soft-start. NC K3, A4 No Connect: Leave pins floating. SYNCO K4 Synchronization output: Outputs a low signal for ½ of the minimum period for synchronization of other converters. SYNCI K5 Synchronization input: Synchronize to the falling edge of external clock frequency. SYNCI is a high impedance digital input node and should always be connected to SGND when not in use. SDA D1 Data Line: Connect to SGND for PI33XX-10 and -11. For use with PI33XX-20 and -21 only. SCL E1 Clock Line: Connect to SGND for PI33XX-01. For use with PI33XX-21 only. ADR1 H1 Tri-state Address : No connect for PI33XX-01. For use with PI33XX-21 only. ADR0 G1 Tri-state Address : No connect for PI33XX-01. For use with PI33XX-21 only. Package Pin-Out Block 1: B2-4, C2-4, D2-3, E2-3, F1-3, G2-3, H2-3, J1-3, K1-2 Block 3: G12-14, H12-14, J12-14, K12-14 Block 4: A12-14, B12-14, C12-14, D12-14, E12-14, Block 5: A6-7, B6-7, C6-7, D6-7 123-Lead LGA (10mm x 14mm) Top view

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 6 of 26 PI33XX-X1 PI3311-X1 (1.0 Vout) Electrical Characteristics Specifications apply for -40C < TJ < 125C, Vin =24V, L1=85nH (Note 1) unless other conditions are noted. Parameter Symbol Min Typ Max Units Conditions Input Specifications Input Voltage VIN_DC 8 24 36 V Minimum 1mA load required Input Current IIN_DC 740 mA Vin = 24V, TC = 25°C, Iout=15A Input Current At Output Short (fault condition duty cycle) IIN_Short 25 mA Note 2. Input Quiescent Current IQ_VIN 2.5 mA Disabled Enabled (no load) Input Voltage Slew Rate VIN_SR 1 V/μs Note 2. Output Specifications Output Voltage Total Regulation VOUT_DC 0.987 1.0 1.013 V Note 2. Output Voltage Trim Range VOUT_DC 1.0 1.4 V Note 3. Line Regulation ∆VOUT(∆VIN) 0.10 % @25°C, 8V<Vin<36V Load Regulation ∆VOUT(∆IOUT) 0.10 % @25°C, 0.5A<Iout<15A Output Voltage Ripple VOUT_AC 45 mVp-p Iout=5A, Cout=8x100μF, 20MHz BW Note 4. Continuous Output Current Range IOUT_DC 0.001 15 A Note 2. Current Limit IOUT_CL 18.0 A Protection VIN UVLO Start Threshold VUVLO_START 7.10 7.60 8.00 V VIN UVLO Stop Threshold VUVLO_STOP 6.80 7.25 7.60 V VIN UVLO Hysteresis VUVLO_HYS 0.35 V VIN OVLO Start Threshold VOVLO_START 36.1 37.6 V VIN OVLO Stop Threshold VOVLO_STOP 37.0 38.4 V VIN OVLO Hysteresis VOVLO_HYS 0.8 V VIN UVLO/OVLO Fault Delay Time tf_DLY 128 Cycles Number of the switching freq cycles VIN UVLO/OVLO Response Time tf 500 ns Output Over Voltage Protection VOVP 20 % Above VOUT Over-Temperature Fault Threshold TOTP 130 135 140 °C Note 2. Over-Temperature Restart Hysteresis TOTP_HYS 30 °C Note 1: All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33XX evaluation board with 3x4” dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. Note 2: Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. Note 3: Output current capability may be limited and other performance may vary from noted electrical characteristics when switching frequency or Vout is modified. Note 4: Refer to Output Ripple plots. Note 5: Refer to Load Current vs. Ambient Temperature curves. Note 6: Refer to Switching Frequency vs. Load current curves.

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 7 of 26 PI33XX-X1 PI3311-X1 (1.0 Vout) Electrical Characteristics Specifications apply for -40□C < TJ < 125□C, Vin =24V, L1=85nH (Note 1) unless other conditions are noted. Parameter Symbol Min Typ Max Units Conditions Timing Switching Frequency fS 500 kHz Note 6. Fault Restart Delay tFR_DLY 30 ms Sync In (SYNCI) Synchronization Frequency Range ∆fSYNCI 50 110 % Relative to set switching frequency. Note 3. SYNCI Threshold VSYNCI 2.5 V Sync Out (SYNCO) SYNCO High VSYNCO_HI 4.5 V Source 1mA SYNCO Low VSYNCO_LO 0.5 V Sink 1mA SYNCO Rise Time tSYNCO_RT 10 ns 20pF load SYNCO Fall Time tSYNCO_FT 10 ns 20pF load Soft Start And Tracking TRK Active Input Range VTRK 0 1.04 V Internal reference tracking range. TRK Max Output Voltage VTRK_MAX 1.2 V TRK Disable Threshold VTRK_OV 20 40 60 mV Charge Current (Soft – Start) ITRK -70 -50 -30 µA Discharge Current (Fault) ITRK_DIS 6.8 mA Soft-Start Time tSS 2.2 ms CTRK = 0uF Enable High Threshold VEN_HI 0.9 1 1.1 V Low Threshold VEN_LO 0.7 0.8 0.9 V Threshold Hysteresis VEN_HYS 100 200 300 mV Enable Pull-Up Voltage (floating, unfaulted) VEN_PU 2 V Enable Pull-Down Voltage (floating, faulted) VEN_PD 0 V Source Current IEN_SO -50 µA Sink Current IEN_SK 50 µA Note 1: All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33XX evaluation board with 3x4” dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. Note 2: Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. Note 3: Output current capability may be limited and other performance may vary from noted electrical characteristics when switching frequency or Vout is modified. Note 4: Refer to Output Ripple plots. Note 5: Refer to Load Current vs. Ambient Temperature curves. Note 6: Refer to Switching Frequency vs. Load current curves. With positive logic EN polarity With negative logic EN polarity With positive logic EN polarity With negative logic EN polarity

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 8 of 26 PI33XX-X1 PI3311-X1 (1.0 Vout) Electrical Characteristics Efficiency at 25°C Regulator and inductor performance 331101 Short Circuit Test Vout (Ch2) = 500mV/Div, Iin (Ch4) = 500mA/Div, 2ms/Div 331103 Switching Frequency vs. Load Current 331105 Transient Response: 7.5A to 15A, at 5A/µs 24Vin to 1.0Vout, Cout = 8X 100μF Ceramic 331102 Vout (Ch2) = 100mV/Div, Iout (Ch3) = 5A/Div, 200uS/Div Output Ripple: 24Vin, 1.0Vout at 15A Cout = 8X 100µF Ceramic, Vout = 50mV/Div, 2.0us/Div 331104 Output ripple: 24Vin, 1.0Vout at 7A Cout = 8X 100µF Ceramic, Vout = 50mV/Div, 2.0us/Div 331106 100 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Efficiency (%) Load Current (A) 8Vin 12Vin 24Vin 36Vin 100 200 300 400 500 600 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Frequency (KHz) Load Current (A) 8Vin 12Vin 24Vin 36Vin

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 9 of 26 PI33XX-X1 PI3318-X1 (1.8 Vout) Electrical Characteristics Specifications apply for -40C < TJ < 125C, Vin =24V, L1=125nH (Note 1) unless other conditions are noted. Parameter Symbol Min Typ Max Units Conditions Input Specifications Input Voltage VIN_DC 8 24 36 V Input Current IIN_DC 1.25 A Iout=15A Input Current At Output Short (fault condition duty cycle) IIN_Short 45 mA Note 2. Input Quiescent Current IQ_VIN 2.5 mA Disabled Enabled (no load) Input Voltage Slew Rate VIN_SR 1 V/μs Note2. Output Specifications Output Voltage Total Regulation VOUT_DC 1.773 1.8 1.827 V Note 2. Output Voltage Trim Range VOUT_DC 1.4 2.0 V Note 3. Line Regulation ∆VOUT(∆VIN) 0.10 % @25°C, 8V<Vin<36V Load Regulation ∆VOUT(∆IOUT) 0.10 % @25°C, 0.5A<Iout<15A Output Voltage Ripple VOUT_AC 30 mVp-p Iout=5A, Cout=8x100μF, 20MHz BW Note 4. Continuous Output Current Range IOUT_DC 0 15 A Note 2. Current Limit IOUT_CL 18.0 A Protection VIN UVLO Start Threshold VUVLO_START 7.10 7.60 8.00 V VIN UVLO Stop Threshold VUVLO_STOP 6.80 7.25 7.60 V VIN UVLO Hysteresis VUVLO_HYS 0.35 V VIN OVLO Start Threshold VOVLO_START 36.1 37.6 V VIN OVLO Stop Threshold VOVLO_STOP 37.0 38.4 V VIN OVLO Hysteresis VOVLO_HYS 0.8 V VIN UVLO/OVLO Fault Delay Time tf_DLY 128 Cycles Number of the switching freq cycles VIN UVLO/OVLO Response Time tf 500 ns Output Over Voltage Protection VOVP 20 % Above VOUT Over-Temperature Fault Threshold TOTP 130 135 140 °C Note 2. Over-Temperature Restart Hysteresis TOTP_HYS 30 °C Note 1: All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33XX evaluation board with 3x4” dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. Note 2: Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. Note 3: Output current capability may be limited and other performance may vary from noted electrical characteristics when switching frequency or Vout is modified. Note 4: Refer to Output Ripple plots. Note 5: Refer to Load Current vs. Ambient Temperature curves. Note 6: Refer to Switching Frequency vs. Load current curves.

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 10 of 26 PI33XX-X1 PI3318-X1 (1.8 Vout) Electrical Characteristics Specifications apply for -40C < TJ < 125C, Vin =24V, L1=125nH (Note 1) unless other conditions are noted. Parameter Symbol Min Typ Max Units Conditions Timing Switching Frequency fS 550 kHz Note 6. Fault Restart Delay tFR_DLY 30 ms Sync In (SYNCI) Synchronization Frequency Range ∆fSYNCI 50 110 % Relative to set switching frequency. Note 3. SYNCI Threshold VSYNCI 2.5 V Sync Out (SYNCO) SYNCO High VSYNCO_HI 4.5 V Source 1mA SYNCO Low VSYNCO_LO 0.5 V Sink 1mA SYNCO Rise Time tSYNCO_RT 10 ns 20pF load SYNCO Fall Time tSYNCO_FT 10 ns 20pF load Soft Start And Tracking TRK Active Input Range VTRK 0 1.04 V Internal reference tracking range. TRK Max Output Voltage VTRK_MAX 1.2 V TRK Disable Threshold VTRK_OV 20 40 60 mV Charge Current (Soft – Start) ITRK -70 -50 -30 µA Discharge Current (Fault) ITRK_DIS 6.8 mA Soft-Start Time tSS 2.2 ms CTRK = 0uF Enable High Threshold VEN_HI 0.9 1 1.1 V Low Threshold VEN_LO 0.7 0.8 0.9 V Threshold Hysteresis VEN_HYS 100 200 300 mV Enable Pull-Up Voltage (floating, unfaulted) VEN_PU 2 V Enable Pull-Down Voltage (floating, faulted) VEN_PD 0 V Source Current IEN_SO -50 µA Sink Current IEN_SK 50 µA Note 1: All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33XX evaluation board with 3x4” dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. Note 2: Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. Note 3: Output current capability may be limited and other performance may vary from noted electrical characteristics when switching frequency or Vout is modified. Note 4: Refer to Output Ripple plots. Note 5: Refer to Load Current vs. Ambient Temperature curves. Note 6: Refer to Switching Frequency vs. Load current curves.

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 11 of 26 PI33XX-X1 PI3318-X1 (1.8 Vout) Electrical Characteristics Efficiency at 25°C Regulator and inductor performance 331801 Short Circuit Test Vout (Ch3) = 500mV/Div, Iin (Ch2) = 1A/Div, 1ms/Div 331803 Switching Frequency vs. Load Current 331805 Transient Response: 7A to 15A, at 5A/µs 24Vin to 1.8Vout, Cout = 8X 100µF Ceramic 331802 Vout (Ch3) = 100mV/Div, Iin (Ch4) = 10A/Div, 80us/Div Output Ripple: 24Vin, 1.8Vout at 15A Cout = 8X 100µF Ceramic, Vout = 20mV/Div, 2.0us/Div 331804 Output ripple: 24Vin, 1.8Vout at 7.5A Cout = 8X 100µF Ceramic, Vout = 20mV/Div, 2.0us/Div 331806 100 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Efficiency(%) Load Current (A) 8Vin 12Vin 24Vin 36Vin 100 200 300 400 500 600 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Switching Frequency(kHz) Load Current(A) 8Vin 12Vin 24Vin 36Vin

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 12 of 26 PI33XX-X1 PI3312-X1 (2.5 Vout) Electrical Characteristics Specifications apply for -40C < TJ < 125C, Vin =24V, L1=125nH (Note 1) unless other conditions are noted. Parameter Symbol Min Typ Max Units Conditions Input Specifications Input Voltage VIN_DC 8 24 36 V Note 7. Input Current IIN_DC 1.7 A Vin = 24V, TC = 25°C, Iout=15A Input Current At Output Short (fault condition duty cycle) IIN_Short 60 mA Note 2. Input Quiescent Current IQ_VIN 2.5 mA Disabled Enabled (no load) Input Voltage Slew Rate VIN_SR 1 V/μs Note 2. Output Specifications Output Voltage Total Regulation VOUT_DC 2.465 2.5 2.535 V Note 2. Line Regulation ∆VOUT (∆VIN) 0.10 % @25°C, 8V<Vin<36V Load Regulation ∆VOUT (∆IOUT) 0.10 % @25°C, 0.5A<Iout<15A Output Voltage Ripple VOUT_AC 28 mVp-p Iout=5A, Cout=8x100μF, 20MHz BW Note 4. Continuous Output Current Range IOUT_DC 0 15 A Note 2. Note 7. Current Limit IOUT_CL 18.0 A Protection VIN UVLO Start Threshold VUVLO_START 7.10 7.60 8.00 V VIN UVLO Stop Threshold VUVLO_STOP 6.80 7.25 7.60 V VIN UVLO Hysteresis VUVLO_HYS 0.35 V VIN OVLO Start Threshold VOVLO_START 36.1 37.6 V VIN OVLO Stop Threshold VOVLO_STOP 37.0 38.4 V VIN OVLO Hysteresis VOVLO_HYS 0.8 V VIN UVLO/OVLO Fault Delay Time tf_DLY 128 Cycles Number of the switching freq cycles VIN UVLO/OVLO Response Time tf 500 ns Output Over Voltage Protection VOVP 20 % Above VOUT Over-Temperature Fault Threshold TOTP 130 135 140 °C Note 2. Over-Temperature Restart Hysteresis TOTP_HYS 30 °C Note 1: All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33XX evaluation board with 3x4” dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. Note 2: Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. Note 3: Output current capability may be limited and other performance may vary from noted electrical characteristics when switching frequency or Vout is modified. Note 4: Refer to Output Ripple plots. Note 5: Refer to Load Current vs. Ambient Temperature curves. Note 6: Refer to Switching Frequency vs. Load current curves. Note 7: Minimum 5V between Vin-Vout must be maintained or a minimum load of 1mA required.

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 13 of 26 PI33XX-X1 PI3312-X1 (2.5 Vout) Electrical Characteristics Specifications apply for -40C < TJ < 125C, Vin =24V, L1=125nH (Note 1) unless other conditions are noted. Parameter Symbol Min Typ Max Units Conditions Timing Switching Frequency fS 650 kHz Note 6. Fault Restart Delay tFR_DLY 30 ms Sync In (SYNCI) Synchronization Frequency Range ∆fSYNCI 50 110 % Relative to set switching frequency. Note 3. SYNCI Threshold VSYNCI 2.5 V Sync Out (SYNCO) SYNCO High VSYNCO_HI 4.5 V Source 1mA SYNCO Low VSYNCO_LO 0.5 V Sink 1mA SYNCO Rise Time tSYNCO_RT 10 ns 20pF load SYNCO Fall Time tSYNCO_FT 10 ns 20pF load Soft Start And Tracking TRK Active Input Range VTRK 0 1.04 V Internal reference tracking range. TRK Max Output Voltage VTRK_MAX 1.2 V TRK Disable Threshold VTRK_OV 20 40 60 mV Charge Current (Soft – Start) ITRK -70 -50 -30 µA Discharge Current (Fault) ITRK_DIS 6.8 mA Soft-Start Time tSS 2.2 ms CTRK = 0uF Enable High Threshold VEN_HI 0.9 1 1.1 V Low Threshold VEN_LO 0.7 0.8 0.9 V Threshold Hysteresis VEN_HYS 100 200 300 mV Enable Pull-Up Voltage (floating, unfaulted) VEN_PU 2 V Enable Pull-Down Voltage (floating, faulted) VEN_PD 0 V Source Current IEN_SO -50 µA Sink Current IEN_SK 50 µA Note 1: All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33XX evaluation board with 3x4” dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. Note 2: Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. Note 3: Output current capability may be limited and other performance may vary from noted electrical characteristics when switching frequency or Vout is modified. Note 4: Refer to Output Ripple plots. Note 5: Refer to Load Current vs. Ambient Temperature curves. Note 6: Refer to Switching Frequency vs. Load current curves. Note 7: Minimum 5V between Vin-Vout must be maintained or a minimum load of 1mA required.

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 14 of 26 PI33XX-X1 PI3312-X1 (2.5 Vout) Electrical Characteristics Efficiency at 25°C Regulator and inductor performance 331201 Short Circuit Vout (Ch1) = 1V/Div, Iin (Ch4) = 1A/Div, 800us/Div 331203 Switching Frequency vs. Load Current 331205 Transient Response: 7.5A to 15A, at 5A/µs 24Vin to 2.5Vout, Cout = 8 x 100µF Ceramic 331202 Vout (Ch1) = 200mV/Div, Iout (Ch4) = 5A/Div, 200us/Div Output Ripple: 24Vin, 2.5Vout at 15A Vout = 50mV/Div, 4.0us/Div, Cout = 8 x 100µF Ceramic 331204 Output Ripple: 24Vin, 2.5Vout at 7.5A Vout = 50mV/Div, 4.0us/Div, Cout = 8 x 100µF Ceramic 331206 100 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Efficiency (%) Load Current (A) 8Vin 12Vin 24Vin 36Vin 100 200 300 400 500 600 700 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Switching Frequency (kHz) Load Current (A) 8Vin 12Vin 24Vin 36Vin

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 15 of 26 PI33XX-X1 PI3301-X1 (3.3 Vout) Electrical Characteristics Specifications apply for -40C < TJ < 125C, Vin =24V, L1=155nH (Note 1) unless other conditions are noted. Parameter Symbol Min Typ Max Units Conditions Input Specifications Input Voltage VIN_DC 8 24 36 V Note 7. Input Current IIN_DC 2.25 A Vin = 24V, TC = 25°C, Iout=15A Input Current At Output Short (fault condition duty cycle) IIN_Short 75 mA Note 2. Input Quiescent Current IQ_VIN 2.5 mA Disabled Enabled (no load) Input Voltage Slew Rate VIN_SR 1 V/μs Note 2. Output Specifications Output Voltage Total Regulation VOUT_DC 3.25 3.30 3.36 V Note 2. Line Regulation ∆VOUT(∆VIN) 0.10 % @25°C, 8<Vin<36V Load Regulation ∆VOUT(∆IOUT) 0.10 % @25°C, 0.5A<Iout<15A Output Voltage Ripple VOUT_AC 37.5 mVp-p Iout=5A, Cout=8x100μF, 20MHz BW Note 4. Continuous Output Current Range IOUT_DC 0 15 A Note 2. Note 7. Current Limit IOUT_CL 18.0 A Protection VIN UVLO Start Threshold VUVLO_START 7.10 7.60 8.00 V VIN UVLO Stop Threshold VUVLO_STOP 6.80 7.25 7.60 V VIN UVLO Hysteresis VUVLO_HYS 0.35 V VIN OVLO Start Threshold VOVLO_START 36.1 37.6 V VIN OVLO Stop Threshold VOVLO_STOP 37.0 38.4 V VIN OVLO Hysteresis VOVLO_HYS 0.8 V VIN UVLO/OVLO Fault Delay Time tf_DLY 128 Cycles Number of the switching freq cycles VIN UVLO/OVLO Response Time tf 500 ns Output Over Voltage Protection VOVP 20 % Above VOUT Over-Temperature Fault Threshold TOTP 130 135 140 °C Note 2. Over-Temperature Restart Hysteresis TOTP_HYS 30 °C Note 1: All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33XX evaluation board with 3x4” dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. Note 2: Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. Note 3: Output current capability may be limited and other performance may vary from noted electrical characteristics when switching frequency or Vout is modified. Note 4: Refer to Output Ripple plots. Note 5: Refer to Load Current vs. Ambient Temperature curves. Note 6: Refer to Switching Frequency vs. Load current curves.

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 16 of 26 PI33XX-X1 PI3301-X1 (3.3 Vout) Electrical Characteristics Specifications apply for -40C < TJ < 125C, Vin =24V, L1=155nH (Note 1) unless other conditions are noted. Parameter Symbol Min Typ Max Units Conditions Timing Switching Frequency fS 650 kHz Note 6. Fault Restart Delay tFR_DLY 30 ms Sync In (SYNCI) Synchronization Frequency Range ∆fSYNCI 50 110 % Relative to set switching frequency. Note 3. SYNCI Threshold VSYNCI 2.5 V Sync Out (SYNCO) SYNCO High VSYNCO_HI 4.5 V Source 1mA SYNCO Low VSYNCO_LO 0.5 V Sink 1mA SYNCO Rise Time tSYNCO_RT 10 ns 20pF load SYNCO Fall Time tSYNCO_FT 10 ns 20pF load Soft Start And Tracking TRK Active Input Range VTRK 0 1.04 V Internal reference tracking range. TRK Max Output Voltage VTRK_MAX 1.2 V TRK Disable Threshold VTRK_OV 20 40 60 mV Charge Current (Soft – Start) ITRK -70 -50 -30 µA Discharge Current (Fault) ITRK_DIS 6.8 mA Soft-Start Time tSS 2.2 ms CTRK = 0uF Enable High Threshold VEN_HI 0.9 1 1.1 V Low Threshold VEN_LO 0.7 0.8 0.9 V Threshold Hysteresis VEN_HYS 100 200 300 mV Enable Pull-Up Voltage (floating, unfaulted) VEN_PU 2 V Enable Pull-Down Voltage (floating, faulted) VEN_PD 0 V Source Current IEN_SO -50 µA Sink Current IEN_SK 50 µA Note 1: All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33XX- X1 evaluation board with 3x4” dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. Note 2: Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. Note 3: Output current capability may be limited and other performance may vary from noted electrical characteristics when switching frequency or Vout is modified. Note 4: Refer to Output Ripple plots. Note 5: Refer to Load Current vs. Ambient Temperature curves. Note 6: Refer to Switching Frequency vs. Load current curves. Note 7: Minimum 5V between Vin-Vout must be maintained or a minimum load of 1mA required.

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 17 of 26 PI33XX-X1 PI3301-X1 (3.3 Vout) Electrical Characteristics Efficiency at 25°C Regulator and inductor performance 330101 Short Circuit Vout (Ch1) = 1V/Div, Iout (Ch4) = 1A/Div, 800us/Div 330103 Switching Frequency vs. Load Current 330105 Transient Response: 7.5 to 15A, at 5A/µs 24Vin to 3.3Vout, Cout = 8 x 100µF Ceramic 330102 Vout (Ch1) = 200mV/Div, Iout (Ch4) = 5A/Div, 200us/Div Output Ripple: 24Vin, 3.3Vout at 15A Vout = 50mV/Div, 2.0us/Div, Cout = 8 x 100µF Ceramic 330104 Output Ripple: 24Vin, 3.3Vout at 7.5A Vout = 50mV/Div, 2.0us/Div, Cout = 8 x 100µF Ceramic 330106 100 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Efficiency (%) Load Current (A) 8Vin 12Vin 24Vin 36Vin 100 200 300 400 500 600 700 800 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Swicthing Frequency (kHz) Load Current (A) 8Vin 12Vin 24Vin 36Vin

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 18 of 26 PI33XX-X1 Functional Description The PI33XX-X1 is a family of highly integrated ZVS- Buck regulators. The PI33XX-X1 has a set output voltage that is trimmable within a prescribed range shown in Table 1. Performance and maximum output current are characterized with a specific external power inductor (see Table 5). Figure 2 - ZVS-Buck with required components For basic operation, Figure 2 shows the connections and components required. No additional design or settings are required. ENABLE (EN) EN is the enable pin of the converter. The EN Pin is referenced to SGND and permits the user to turn the converter on or off. The EN default polarity is a positive logic assertion. If the EN pin is left floating or asserted high, the converter output is enabled. Pulling EN pin below 0.8 Vdc with respect to SGND will disable the regulator output. The EN inpu t polarity can be programmed (PI33XX- 21 device versions only) via the I2C data bus. When the EN pin polarity is programmed for negative logic assertion; and if the EN pin is left floating, the regulator output is enabled. Pulling the EN pin above

1.0 Vdc with respect to SGND, will disable the

regulator output. Remote Sensing An internal 100Ω resistor is connected between REM pin and VOUT pin to provide regulation when the REM connection is broken. Referring to Figure 2, it is important to note that L1 and Cout are the output filter and the local sense point for the power supply output. As such, the REM pin should be connected at Cout as the default local sense connection unless remote sensing to compensate additional distribution losses in the system. The REM pin should not be left floating. Switching Frequency Synchronization The SYNCI inpu t allows the user to synchronize the controller switching frequency by an external clock referenced to SGND. The external clock can synchronize the unit between 50% and 110% of the preset switching frequency (fS). For PI33XX-21 device versions only, the phase delay can be programmed via I2C bus with respect to the clock applied at SYNCI pin. Phase delay allows PI33XX-X1 regulators to be paralleled and operate in an interleaving mode. The PI33XX- X1 default fo r SYNCI is to sync with respect to the falling edge of the applied clock providing 180° phase shift from SYNCO. This allows for the paralleling of two PI33XX-X1 devices without the need for further user programming or external sync clock circuitry. The user can change the SYNCI polarity to sync with the external clock rising edge via the I2C data bus (PI33XX-21 device versions only). When using the internal oscillator, the SYNCO pin provides a 5V clock that can be used to sync other regulators. Therefore, one PI33XX-X1 can act as the lead regulator and have additional PI33XX-X1s running in parallel and interleaved. Soft-Start The PI33XX-X 1 includes an internal soft-start capacitor to ramp the output voltage in 2ms from 0V to full output voltage. Connecting an external capacitor from the TRK pin to SGND will increase the start-up ramp period. See, “Soft Start Adjustment and Track,” in the Applications Description section for more details. Output Voltage Trim The PI33XX-X1 output voltage can be trimmed up from the preset output by connecting a resistor from ADJ pin to SGND and can be trimmed down by connecting a resistor from ADJ pin to VOUT. The Table 2 defines the voltage ranges for the PI33XX-X1 family. EN SGND Vin Vin Vout SYNCI VS1 Vout PGND SYNCO REM TRK ADJ EAO PI33XXCin Cout

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 19 of 26 PI33XX-X1 Device Output Voltage Set Range PI3311-X1-LGIZ 1.0V 1.0 to 1.4V PI3318-X1-LGIZ 1.8V 1.4 to 2.0V PI3312-X1-LGIZ 2.5V 2.0 to 3.1V PI3301-X1-LGIZ 3.3V 2.3 to 4.1V Table 2 - PI33XX-X1 family output voltage ranges. Output Current Limit Protection PI33XX-X1 has two methods implemented to protect from output short or over current condition. Slow Current Limit protection : prevents the output load from sourcing current higher than the regulator’s maximum rated current. If the output current exceeds the Current Limit (IOUT_CL) for 1024us, a slow current limit fault is initiated and the regulator is shutdown which eliminates output current flow. After Fault Restart Delay (tFR_DLY), a soft-start cycle is initiated. This restart cycle will be repeated indefinitely until the excessive load is removed. Fast Current Limit protection : PI33XX-X1 monitors the regulator inductor current pulse-by-pulse to prevent the output from supplying very high current due to a sudden low impedance short. If the regulator senses a high inductor current pulse, it will initiate a fault and stop switching until Fault Restart Delay ends and then initiate a soft-start cycle. Both the Fast and Slow current limit faults are stored in a Fault Register and can be read and cleared (PI33XX-21 device versions only) via I2C data bus. Input Under-Voltage Lockout If VIN falls below the input Under Voltage Lockout (UVLO) threshold, the regulator will enter a low power state and initiate a fault. The system will restart once the input voltage is reestablished and after the Fault Restart Delay. A UVLO fault is stored in a Fault Register and can be read and cleared (PI33XX-21 device versions only) via I2C data bus. Input Over Voltage Lockout If VIN exceeds the inpu t Over Voltage Lockout (OVLO) threshold (VOVLO), while the regulator is running, the PI33XX-X1 will complete the current cycle and stop switching. The system will resume operation after the Fault Restart Delay. The OVLO fault is stored in a Fault Register and can be read and cleared (PI33XX-21 device versions only) via I2C data bus. Output Over Voltage Protection The PI33XX-X1 family is equipped with output Over Voltage Protection (OVP) to prevent damage to input voltage sensitive devices. If the output voltage exceeds 20% of its set regulated value, the regulator will complete the current cycle, stop switching and issue an OVP fault. The system will resume operation once the output voltage falls below the OVP threshold and after Fault Restart Delay. The OVP fault is stored in a Fault Register and can be read and cleared (PI33XX-21 device versions only) via I2C data bus. Over Temperature Protection The internal package temperature is monitored to prevent internal components from reaching their thermal maximum. If the Over Temperature Protection Threshold (OTP) is exceeded (TOTP), the regulator will complete the current switching cycle, enter a low power mode, set a fault flag, and will soft-start when the internal temperature falls below Over-Temperature Restart Hysteresis (TOTP_HYS). The OTP fault is stored in a Fault Register and can be read and cleared (PI33XX-21 device versions only) via I2C data bus. Pulse Skip Mode (PSM) PI33XX-X1 features a PSM to achieve high efficiency at light loads. The regulators are setup to skip pulses if EAO falls below a PSM threshold. Depending on conditions and component values, this may result in single pulses or several consecutive pulses followed by skipped pulses. Skipping cycles significantly reduces gate drive power and improves light load efficiency. The regulator will leave PSM once the EAO rises above the Skip Mode threshold.

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 20 of 26 PI33XX-X1 Variable Frequency Operation Each PI33XX- X1 is preprogrammed to a base operating frequency, with respect to the power stage inductor (see Table 5), to operate at peak efficiency across line and load variations. At low line and high load applications, the base frequency will decrease to accommodate these extreme operating ranges. By stretching the frequency, the ZVS operation is preserved throughout the total input line voltage range therefore maintaining optimum efficiency. Parallel Operation Paralleling modules can be used to increase the output current capability of a single power rail and reduce output voltage ripple. SGND Vin Vin Vout VS1 Vout PGND REM TRK EAO ZVS Buck (#1) Cin Cout SGND Vin Vout VS1 PGND REM ZVS Buck (#2) Cout EN EAO(#2) TRK(#2) EN(#2) Vin Cin PGD SYNCI SYNCOSYNCI(#2) SYNCO(#2) TRK EAO EN EAO(#1) TRK(#1) EN(#1) PGD SYNCI SYNCOTo R1 SYNCO(#1) Figure 3 - PI33XX-X1 parallel operation By connecting the EAO pins and SGND pins of each module together the units will share the current equally. When the TRK pins of each unit are connected together, the units will track each other during soft-start and all unit EN pins have to be released to allow the units to start (See Figure 3). Also, any fault event in any regulator will disable the other regulators. The two regulators will be out of phase with each other reducing output ripple (refer to Switching Frequency Synchronization). To provide synchronization between regulators over the entire operational frequency range, the Parallel Good (PGD) pin must be connected to the lead regulator’s (#1) SYNCI pin and a 2.5kΩ Resistor, R1, must be placed between SYNCO (#2) return and the lead regulator’s SYNCI (#1) pin, as shown in Figure 3. In this configuration, at system soft-start, the PGD pin pulls SYNCI low forcing the lead regulator to initialize the open-loop startup synchronization. Once the regulators reach regulation, SYNCI is released and the system is now synchronized in a closed-loop configuration which allows the system to adjust, on the fly, when any of the individual regulators begin to enter variable frequency mode in the loop. Multi-phasing three regulators is possible (PI33XX-21 only) with no change to the basic single-phase design. For more information about how to program phase delays within the regulator, please refer to Picor application note PI33XX-2X Multi-Phase Design Guide. I2C Interface Operation PI33XX-21 devices provide an I2C digital interface that enables the user to program the EN pin polarity (from high to low assertion) and switching frequency synchronization phase/delay. These are one time programmable options to the device. Also, the PI33XX-21 devices allow for dynamic Vout margining via I2C that is useful during development (settings stored in volatile memory only and not retained by the device). The PI33XX-21 also have the option for fault telemetry including:  Over temperature protection  Fast/Slow current limit  Output voltage high  Input overvoltage  Input undervoltage For more information about how to utilize the I2C interface please refer to Picor application note PI33XX-2X I2C Digital Interface Guide.

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 21 of 26 PI33XX-X1 Application Description Output Voltage Trim The PI33XX- X1 family of Bu ck Regulators provides four common output voltages: 1.0V, 1.8V, 2.5V, and 3.3V. A post-package trim step is implemented to offset any resistor divider network errors ensuring maximum output accuracy. With a single resistor connected from the ADJ pin to SGND or REM, each device’s output can be varied above or below the nominal set voltage (with the exception of the PI3311-X1 which can only be above the set voltage of 1V). Device Output Voltage Set Range PI3311-X1-LGIZ 1.0V 1.0 to 1.4V PI3318-X1-LGIZ 1.8V 1.4 to 2.0V PI3312-X1-LGIZ 2.5V 2.0 to 3.1V PI3301-X1-LGIZ 3.3V 2.3 to 4.1V Table 3 - PI33XX-X1 family output voltage ranges The remote pin (REM) should always be connected to the VOUT pin, if not used, to prevent an output voltage offset. Figure 4 shows the internal feedback voltage divider network. Figure 4 - Internal resistor divider network R1, R2, and R4 are all internal 1.0 % resistors and R_low and R_high are external resistors for which the designer can add to modify VOUT to a desired output. The internal resistor value for each regulator is listed below in Table 4. Device R1 R2 R4 PI3311-X1-LGIZ 1k Open 100 PI3318-X1-LGIZ 0.806k 1.0k 100 PI3312-X1-LGIZ 1.5k 1.0k 100 PI3301-X1-LGIZ 2.61k 1.13k 100 Table 4 - PI33XX-X1 Internal divider values By choosin g an output voltage value within the ranges stated in Table 3, VOUT can simply be adjusted up or down by selecting the proper R_high or R_low value, respectively. The following equations can be used to calculate R_high and R_low values: ( ) ( ) ( ) ( ( ) If, for example, a 4.0V output is needed, the user should choose the regulator with a trim range covering 4.0V from Table 3. For this example, the PI3301 is selected (3.3V set voltage). First step would be to use Equation (1) to calculate R_high since the required output voltage is higher than the regulator set voltage. The resistor-divider network values for the PI3301 are can be found in Table 4 and are R1=2.61kΩ and R2=1.13kΩ. Inserting these values in to Equation (1), R_high is calculated as follows: ( ) Resistor R-high would be connected as in Figure 4 to achieve the 4.0V regulator output. No R_low resistor would be used since in this example the trim is above the regulator set voltage. The PI3311-X1 output voltage can only be trimmed higher than the factory 1V setting. The following - ADJ REM VOUT SGND R_low R_high 1.0Vdc

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 25 of 26 PI33XX-X1 Package Drawings

vicorpower.com Rev 1.3 Cool-Power® 800 735.6200 09/2015 Page 26 of 26 PI33XX-X1 Warranty Information furnished by Vicor is believed to be accurate and reliable. However, no responsibility is assumed by Vicor for its use. Vicor makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication. Vicor reserves the right to make changes to any products, specifications, and product descriptions at any time without notice. Information published by Vicor has been checked and is believed to be accurate at the time it was printed; however, Vicor assumes no responsibility for inaccuracies. Testing and other quality controls are used to the extent Vicor deems necessary to support Vicor’s product warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. Specifications are subject to change without notice. Vicor’s Standard Terms and Conditions All sales are subject to Vicor’s Standard Terms and Conditions of Sale, which are available on Vicor’s webpage or upon request. Product Warranty In Vicor’s standard terms and conditions of sale, Vicor warrants that its products are free from non -conformity to its Standard Specifications (the “Express Limited Warranty”). This warranty is extended only to the original Buyer for the period expiring two (2) years after the date of shipment and is not transferable. UNLESS OTHERWISE EXPRESSLY STATED IN A WRITTEN SALES AGREEMENT SIGNED BY A DULY AUTHORIZED VICOR SIGNATORY, VICOR DISCLAIMS ALL REPRESENTATIONS, LIABILITIES, AND WARRANTIES OF ANY KIND (WHETHER ARISING BY IMPLICATION OR BY OPERATION OF LAW) WITH RESPECT TO THE PRODUCTS, INCLUDING, WITHOUT LIMITATION, ANY WARRANTIES OR REPRESENTATIONS AS TO MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE, INFRINGEMENT OF ANY PATENT, COPYRIGHT, OR OTHER INTELLECTUAL PROPERTY RIGHT, OR ANY OTHER MATTER. This warranty does not extend to products subjected to misuse, accident, or improper application, maintenance, or storage. Vicor shall not be liable for collateral or consequential damage. Vicor disclaims any and all liability arising out of the application or use of any product or circuit and assumes no liability for applications assistance or buyer product design. Buyers are responsible for their products and applications using Vicor products and components. Prior to using or distributing any products that include Vicor components, buyers should provide adequate design, testing and operating safeguards. Vicor will repair or replace defective products in accordance with its own best judgment. For service under this warranty, the buyer must contact Vicor to obtain a Return Material Authorization (RMA) number and shipping instructions. Products returned without prior authorization will be returned to the buyer. The buyer will pay all charges incurred in returning the product to the factory. Vicor will pay all reshipment charges if the product was defective within the terms of this warranty. Life Support Policy VICOR’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL COUNSEL OF VICOR CORPORATION. As used herein, life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b) support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in a significant injury to the user. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness. Per Vicor Terms and Conditions of Sale, the user of Vicor products and components in life support applications assumes all risks of such use and indemnifies Vicor against all liability and damages. Intellectual Property Notice Vicor and its subsidiaries own Intellectual Property (including issued U.S. and Foreign Patents and pending patent applications) relating to the products described in this data sheet. No license, whether express, implied, or arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Interested parties should contact Vicor's Intellectual Property Department. The products described on this data sheet are protected by the following U.S. Patents Numbers: RE 40,072. Vicor Corporation Picor Corporation

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