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8V to 36VIN Cool-Power ZVS Buck Regulator Cool-Power® ZVS Switching Regulators PI3302-00-BGIZ Cool-Power® ZVS Switching Regulators Rev 1.0 Page 1 of 19 05/2017 Product Description The PI3302-00 is a high efficiency, wide input range DC-DC ZVS-Buck regulator integrating controller, power switches, and support components all within a high density System-in-Package (SiP). The integration of a high performance Zero-Voltage Switching (ZVS) topology increases point of load performance providing best in class power efficiency. The PI3302-00 requires only an external inductor and minimal capacitors to form a complete DC-DC switching mode Buck Regulator. The ZVS architecture also enables high frequency operation while minimizing switching losses and maximizing efficiency. The high switching frequency operation reduces the size of the external filtering components, improves power density, and enables very fast dynamic response to line and load transients. The PI3302-00 sustains high switching frequency all the way up to the rated input voltage without sacrificing efficiency and, with its 20ns minimum on-time, supports large step down conversions up to 36VIN. Features & Benefits

  • 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/Undervoltage Lockout (OVLO/UVLO)
  • Output Overvoltage Protection (OVP)
  • Overtemperature Protection (OTP)
  • Fast and slow current limits
  • -40°C to 125°C operating range (TJ)

Applications

  • High efficiency systems
  • High voltage battery operation

Package Information

  • 10.5mm x 14.5mm x 2.6mm BGA SiP Device Output Voltage IOUT Max Set Range PI3302-00 5.0V 3.3 to 6.5V 10A

Cool-Power® ZVS Switching Regulators Rev 1.0 Page 3 of 19 05/2017 PI3302-00-BGIZ Order Information Cool-Power Output Range IOUT Max Package Transport MediaSet Range

Cool-Power® ZVS Switching Regulators Rev 1.0 Page 4 of 19 05/2017 PI3302-00-BGIZ Absolute Maximum Ratings [1] Functional Block Diagram VIN VOUT [1] 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. [2] Operating is defined as steady state 10A load with recommended 200nH inductor ±10% when measured with 50Ω, 7.5GHz transmission line probe LeCroy PP066 or equivalent. [3] Transient peak operating conditions occurring for less than 1ms such as power cycling, short circuit and overload are guaranteed by design. Simplified Block Diagram Name Rating VIN -0.7 to 36V VS1 -0.7 to 36VDC, -11V for ≤5ns operating [2]. [3] SGND 100mA PWRGD, SYNCO, SYNCI, EN, EAO, ADJ, TRK, ADR1, ADR2, SCL, SDA, REM -0.3V to 5.5V / 5mA VOUT -1.5V to 21V 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

Cool-Power® ZVS Switching Regulators Rev 1.0 Page 5 of 19 05/2017 PI3302-00-BGIZ Package Pin-Out Pin Description PWRGD EAO EN REM VS1 Block 4 VIN Block 3 PGND Block 2 SYNCI SYNCO VDR SGND ADJ TRK SDA SCL ADR0 ADR1 K J H G F E D C B A 13125431 1421 098761 1 SGND Block 1 VOUT Block 5 NC 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 Pin Name Number Description SGND Block 1 Signal Ground: Internal logic ground for EA, TRK, SYNCI, SYNCO and ADJ 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. PWRGD A1 Power Good: High impedance when regulator is operating and V OUT is in regulation. Otherwise pulls to SGND. Also can be 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. 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 A4 No Connect: Leave pins floating. VDR K3 VDR can only be used for ADR0 and ADR1 pull up reference voltage. No other external loading is permitted 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. SCL E1 Clock Line: Connect to SGND. ADR1 H1 Tri-state Address: No connect. ADR0 G1 Tri-state Address: No connect.

Cool-Power® ZVS Switching Regulators Rev 1.0 Page 6 of 19 05/2017 PI3302-00-BGIZ PI3302-00-BGIZ (5.0VOUT) Electrical Characteristics Unless otherwise specified: -40°C < TJ < 125°C, VIN = 24V, L1 = 200nH [4] Parameter Symbol Conditions Min Typ Max Unit Input Specifications Input Voltage VIN_DC [10] 8 24 36 V Input Current IIN_DC VIN = 24V, TC = 25°C, IOUT = 10A 2.23 A Input Current At Output Short (fault condition duty cycle) IIN_Short [5] 20 mA Input Quiescent Current IQ_VIN Disabled 2.0 mA Enabled (no load) 2.5 mA Input Voltage Slew Rate VIN_SR 1 V/μs Output Specifications Output Voltage Total Regulation VOUT_DC [5] 4.93 5.00 5.07 V Output Voltage Trim Range VOUT_DC [6] [10] 3.3 6.5 V Line Regulation ∆VOUT (∆VIN) @25°C, 8V < VIN < 36V 0.10 % Load Regulation ∆VOUT (∆IOUT) @25°C, 0.5A < IOUT < 10A 0.10 % Output Voltage Ripple VOUT_AC IOUT = 5A, COUT = 4 x 47μF, 20MHz BW [7] 30 mVp-p Continuous Output Current Range IOUT_DC [8] [10] 10 A Current Limit IOUT_CL 12 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 0.33 V VIN OVLO Start Threshold VOVLO_START 36.1 V VIN OVLO Stop Threshold VOVLO_STOP 37.0 38.4 V VIN OVLO Hysteresis VOVLO_HYS 0.77 V VIN UVLO/OVLO Response Time tf 500 ns Output Overvoltage Protection VOVP Above VOUT 20 % Overtemperature Fault Threshold TOTP 130 135 140 °C Overtemperature Restart Hysteresis TOTP_HYS 30 °C [4] All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI3302-00 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. [5] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. [6] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified. [7] Refer to Output Ripple plots. [8] Refer to Load Current vs. Ambient Temperature curves. [9] Refer to Switching Frequency vs. Load current curves. [10] Minimum 5V between VIN-VOUT must be maintained or a minimum load of 1mA required.

Cool-Power® ZVS Switching Regulators Rev 1.0 Page 7 of 19 05/2017 PI3302-00-BGIZ PI3302-00-BGIZ (5.0VOUT) Electrical Characteristics (Cont.) Unless otherwise specified: -40°C < TJ < 125°C, VIN = 24V, L1 = 200nH [4] Parameter Symbol Conditions Min Typ Max Unit Timing Switching Frequency fS [9] 1.0 MHz Fault Restart Delay tFR_DLY 30 ms Sync In (SYNCI) Synchronization Frequency Range ∆fSYNCI Relative to set switching frequency [6] 50 110 % SYNCI Threshold VSYNCI 2.5 V SYNCI Input Impedance ZSYNCI 100 kΩ Sync Out (SYNCO) SYNCO High VSYNCO_HI Source 1mA 4.5 V SYNCO Low VSYNCO_LO Sink 1mA 0.5 V SYNCO Rise Time tSYNCO_RT 20pF load 10 ns SYNCO Fall Time tSYNCO_FT 20pF load 10 ns Soft Start And Tracking TRK Active Input Range VTRK 0 1.04 V TRK Max Output Voltage 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 VTRK = 0.5V 6.8 mA Soft-Start Time tSS CTRK = 0μF 2.2 ms 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) VEN_PU With positive logic EN polarity 2 V Enable Pull-Down Voltage (Floating) VEN_PD With negative logic EN polarity 0 V Source Current IEN_SO With positive logic EN polarity 50 μA Sink Current IEN_SK With negative logic EN polarity 50 μA [4] All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI3302-00 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. [5] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. [6] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified. [7] Refer to Output Ripple plots. [8] Refer to Load Current vs. Ambient Temperature curves. [9] Refer to Switching Frequency vs. Load current curves. [10] Minimum 5V between VIN-VOUT must be maintained or a minimum load of 1mA required.

Cool-Power® ZVS Switching Regulators Rev 1.0 Page 10 of 19 05/2017 PI3302-00-BGIZ Functional Description The PI3302-00 is a highly integrated ZVS-Buck regulator. The PI3302-00 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 4). For basic operation, Figure 10 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 regulator 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 0.8VDC with respect to SGND will disable the regulator output. 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 1.0VDC 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 10, 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 input 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). The PI3302-00 default for 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 PI3302-00 devices without the need for further user programming or external sync clock circuitry. When using the internal oscillator, the SYNCO pin provides a 5V clock that can be used to sync other regulators. Therefore, one PI3302-00 can act as the lead regulator and have additional PI3302-00s running in parallel and interleaved. Soft-Start The PI3302-00 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 PI3302-00 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. Table 1 defines the voltage range for PI3302-00. EN SGND VIN VIN VOUT SYNCI VS1 VOUT PGND SYNCO REM TRK ADJ EAO PI33xxCIN COUT Table 1 — PI3302-00-BGIZ output voltage range Figure 10 — ZVS-Buck with required components Device Output Voltage Set Range PI3302-00-BGIZ 5.0V 3.3 to 6.5V

Cool-Power® ZVS Switching Regulators Rev 1.0 Page 11 of 19 05/2017 PI3302-00-BGIZ Output Current Limit Protection PI3302-00 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 1024μs, 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: PI3302-00 monitors the regulator inductor current pulse-by-pulse to prevent the output from supplying very high current due to sudden low impedance short (50A Typical). 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. Input Undervoltage Lockout If VIN falls below the input Undervoltage Lockout (UVLO) threshold, but remains high enough to power the internal bias supply, the PI3302-00 will complete the current cycle, stop switching, 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. Input Overvoltage Lockout If VIN exceeds the input Overvoltage Lockout (OVLO) threshold (VOVLO), while the controller is running, the PI3302-00 will complete the current cycle, stop switching, enter a low power state and set an OVLO fault. The system will resume operation when the input voltage falls below 98% of the OVLO threshold and after the Fault Restart Delay. Output Overvoltage Protection The PI3302-00 is equipped with output Overvoltage 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. Overtemperature 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 Overtemperature Restart Hysteresis (TOTP_HYS). Pulse Skip Mode (PSM) PI3302-00 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. Variable Frequency Operation Each PI3302-00 is preprogrammed to a base operating frequency, with respect to the power stage inductor (see Table 4), 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 VS1 PGND REM TRK EAO (#1) SGND VS1 PGND REM(#2) EN EAO(#2) TRK(#2) EN(#2) SYNCI SYNCOSYNCI(#2) SYNCO(#2) TRK EAO EN EAO(#1) TRK(#1) EN(#1) PWRGD SYNCI SYNCOSYNCI(#1) SYNCO(#1) VIN VIN VOUT VOUT CIN COUT VIN VIN VOUTCIN COUT PI33xx PI33xx PWRGD Figure 11 — PI3302-00-BGIZ parallel operation

Cool-Power® ZVS Switching Regulators Rev 1.0 Page 12 of 19 05/2017 PI3302-00-BGIZ The PI3302-00 default for 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 PI3302-00 devices without the need for further user programming or external sync clock circuitry. 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 11). 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 Power Good (PWRGD) 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 11. In this configuration, at system soft-start, the PWRGD 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. Application Description Output Voltage Trim 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. The remote pin (REM) should always be connected to the VOUT pin, if not used, to prevent an output voltage offset. Figure 12 shows the internal feedback voltage divider network. R1, R2, and R4 are all internal 1.0% resistors and Rlow and Rhigh 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 3. Table 2 — PI3302-00 output voltage range - ADJ REM VOUT SGND Rlow Rhigh

1.0 Vdc

Figure 12 — Internal resistor divider network Device Output Voltage Set Range PI3302-00-BGIZ 5.0V 3.3 to 6.5V

Cool-Power® ZVS Switching Regulators Rev 1.0 Page 14 of 19 05/2017 PI3302-00-BGIZ Inductor Pairing The PI3302-00 utilizes an external inductor. This inductor has been optimized for maximum efficiency performance. Table 4 details the specific inductor value and part number utilized for each PI3302-00 device which are available from Coiltronics and Eaton. Data sheets are available at: http://www.cooperindustries.com Thermal Derating Thermal de-rating curves are provided that are based on component temperature changes versus load current, input voltage and air flow. It is recommended to use these curves as a guideline for proper thermal de-rating. These curves represent the entire system and are inclusive to both the PI3302-00 regulator and the external inductor. Maximum thermal operation is limited by either the MOSFETs or inductor depending upon line and load conditions. Thermal measurements were made using a standard PI3302-00 Evaluation board which is 3 x 4 inches in area and uses 4-layer, 2oz copper. Thermal measurements were made on the three main power devices, the two internal MOSFETs and the external inductor, with air flows of 0, 200, and 400LFM. Filter Considerations The PI3302-00 requires input bulk storage capacitance as well as low impedance ceramic X5R input capacitors to ensure proper start up and high frequency decoupling for the power stage. The PI3302-00 will draw nearly all of the high frequency current from the low impedance ceramic capacitors when the main high side MOSFET is conducting. During the time the high side MOSFET is off, they are replenished from the bulk capacitor. If the input impedance is high at the switching frequency of the converter, the bulk capacitor must supply all of the average current into the converter, including replenishing the ceramic capacitors. This value has been chosen to be 100μF so that the PI3302-00 can start up into a full resistive load and supply the output capacitive load with the default minimum soft start capacitor when the input source impedance is 50Ω at 1MHz. The ESR for this capacitor should be approximately 20mΩ. The RMS ripple current in this capacitor is small, so it should not be a concern if the input recommended ceramic capacitors are used. Table 5 shows the recommended input and output capacitors to be used for the various models as well as expected transient response, RMS ripple currents per capacitor, and input and output ripple voltages. Table 6 includes the recommended input and output ceramic capacitors. Table 4 — PI3302-00 Inductor pairing Device VIN (V) ILOAD (A) CINPUT Ceramic X5R CINPUT Bulk Elec. COUTPUT Ceramic X5R CINPUT Ripple Current (IRMS) COUTPUT Ripple Current (IRMS) Input Ripple (mVpp) Output Ripple (mVpp) Output Ripple (mVpp) Recovery Time (µs) Load Step (A) (Slew/µs) PI3302 24 4 x 4.7μF 100μF 50V

4 X 47μF

2 X 1μF

1 X 0.1μF 1.2 1.5 220 50 ±170 30 5 (5A/μs)5 140 30 Table 5 — Recommended input and output capacitance Device Inductor [nH] Inductor Part Number Manufacturer PI3302-00-BGIZ 200 FPT705-200-R Coiltronics

Cool-Power® ZVS Switching Regulators Rev 1.0 Page 16 of 19 05/2017 PI3302-00-BGIZ Figure 19 — Recommended Receiving PCB footprint Recommended PCB Footprint and Stencil

Cool-Power® ZVS Switching Regulators Rev 1.0 Page 17 of 19 05/2017 PI3302-00-BGIZ Package Drawing

Cool-Power® ZVS Switching Regulators Rev 1.0 Page 18 of 19 05/2017 PI3302-00-BGIZ

Revision History

Revision Date Description Page Number(s) 1.0 05/17/17 Initial release as standalone data sheet n/a Note: PI3302-00-BGIZ part was initially released on 01/06/16. See family data sheet PI33xx-x0, revisions 1.9 – 2.5 for previous iterations of the data for this part number.

Cool-Power® ZVS Switching Regulators Rev 1.0 Page 19 of 19 05/2017 PI3302-00-BGIZ Contact Us: http://www.vicorpower.com/contact-us Vicor Corporation

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