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Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 21
Technical content
Features
- Integrated Inductor Technology
- - 40°C to +105°C Ambient Temperature Range
- AEC-Q100 Qualified for Automotive Applications
- 2.5mm x 2.25mm x 1.1mm uQFN Package
- Total Solution Footprint 14mm2
- Low VOUT Ripple for RF Compatibility
- High efficiency, up to 93%
- Up to 600mA Continuous Output Current
- 5 MHz Switching Frequency
- 3 pin VID for Glitch Free Voltage Scaling
- V OUT Range 0.6V to VIN – 0.25V
- Short Circuit and Over Current Protection
- UVLO and Thermal Protection
- IC Level Reliability in a PowerSOC Solution
Applications
- Automotive Applications
- Wireless and RF Applications
- Small Form Factor Optical Modules
- Low noise FPGA IO and Transceivers
- Advanced Low Power Processors, DSP, IO, Memory, Video, Multimedia Engines VOUTVIN 10µF 0805 X7R 4.7µF 0603 X7R VOUTPVIN AVIN PGND AGND VSENSE EP5358xUA VFB VS0 VS1 VS2 ENABLE
Figure 1. Simplified Applications Circuit Figure 2. Highest Efficiency in Smallest Solution Size
10380 June 26, 2015 Rev C
www.altera.com/enpirion, Page 2
Ordering Information
Part Number Package Markings TA (°C) Package Description EP5358LUA BKXX -40 to +105 16-pin (2.5mm x 2.25mm x 1.1mm) uQFN EP5358HUA BNXX -40 to +105 16-pin (2.5mm x 2.25mm x 1.1mm) uQFN EVB-EP5358xUA QFN Evaluation Board Packing and Marking Information: www.altera.com/support/reliability/packing/rel-packing-and-marking.html Pin Assignments (Top View) Figure 3. EP5358LUA Pin Out Diagram (Top View) Figure 4. EP5358HUA Pin Out Diagram (Top View) NOTE A : NC pins are not to be electrically connected to each other or to any external signal, ground, or voltage. However, they must be soldered to the PCB. Failure to follow this guideline may result in part malfunction or damage. NOTE B: White ‘dot’ on top left is pin 1 indicator on top of the device package. may result in part malfunction or damage to the device. 4 VFB/NC EP5358LUA: Feedback pin for external divider option. 5 VSENSE Sense pin for preset output voltages. Refer to application section for proper configuration . 7, 8 VOUT Regulated Output Voltage. Refer to application section for proper layout and decoupling. Output voltage select. VS2 = pin 9, VS1 = pin 10, VS0 = pin 11. EP5358LUA: Selects one of seven preset output voltages or an external resistor divider. EP5358HUA: Selects one of eight preset output voltages.
www.altera.com/enpirion, Page 3 PIN NAME FUNCTION 12 ENABLE Output Enable. Enable = logic high; Disable = logic low 13 AVIN Input power supply for the controller circuitry. 14 PVIN Input Voltage for the MOSFET switches. Absolute Maximum Ratings CAUTION: Absolute Maximum ratings are stress ratings only. Functional operation beyond the recommended operating conditions is not implied. Stress beyond the absolute maximum ratings may impair device life. Exposure to absolute maximum rated conditions for extended periods may affect device reliability. PARAMETER SYMBOL MIN MAX UNITS Input Supply Voltage VIN -0.3 6.0 V Voltages on: ENABLE, VSENSE, VSO – VS2 -0.3 VIN+ 0.3 V Voltages on: VFB (EP5358LUA) -0.3 2.7 V Maximum Operating Junction Temperature TJ-ABS 150 °C Storage Temperature Range TSTG -65 150 °C Reflow Temp, 10 Sec, MSL3 JEDEC J-STD-020C 260 °C ESD Rating (based on Human Body Mode) 2000 V Recommended Operating Conditions PARAMETER SYMBOL MIN MAX UNITS Input Voltage Range VIN 2.4 5.5 V Operating Ambient Temperature TA -40 +105 °C Operating Junction Temperature TJ -40 +125 °C Thermal Characteristics PARAMETER SYMBOL TYP UNITS Thermal Resistance: Junction to Ambient –0 LFM (Note 1) θJA 85 °C/W Thermal Overload Trip Point TJ-TP +155 °C Thermal Overload Trip Point Hysteresis 25 °C Note 1: Based on a four layer copper board and proper thermal design per JEDEC EIJ/JESD51 standards .
Electrical Characteristics
NOTE: VIN=3.6V, Minimum and Maximum values are over operating ambient temperature range unless otherwise noted. Typical values are at TA = 25°C. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS Operating Input Voltage VIN 2.4 5.5 V Under Voltage Lock- out – VIN Rising VUVLO_R 2.0 V Under Voltage Lock- out – VIN Falling VUVLO_F 1.9 V Drop Out Resistance RDO Input to Output Resistance 350 500 mΩ Output Voltage Range VOUT EP5358LUA (VDO = ILOAD X RDO) EP5358HUA 0.6
1.8 VIN-VDO
3.3 V
www.altera.com/enpirion, Page 4 PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS Operating Input Voltage Range VIN 2.4 5.5 V Under Voltage Lock- out – VIN Rising VUVLO_R 2.0 V Under Voltage Lock- out – VIN Falling VUVLO_F 1.9 V Drop Out Resistance RDO Input to Output Resistance in 100% duty cycle operation. 350 500 mΩ Output Voltage Range VOUT EP5358LUA (VDO = ILOAD X RDO) EP5358HUA 0.6 3.3 V Dynamic Voltage Slew Rate (VID Change) VSLEW EP5358LUA EP5358HUA 4
8 V/ms
Accuracy ∆VOUT TA = 25°C, VIN = 3.6V; ILOAD = 100mA ; 0.8V ≤ VOUT ≤ 3.3V -2 +2 % Line Regulation ∆VOUT_LINE 2.4V ≤ VIN ≤ 5.5V; ILOAD = 0A 0.03 %/V Load Regulation ∆VOUT_LOAD 0A ≤ ILOAD ≤ 600mA; VIN = 3.6V 0.48 %/A Temperature Variation ∆VOUT_TEMP L -40°C ≤ TA ≤ +105°C 24 ppm/°C Output Current Range IOUT 0 600 mA Shut-down Current ISD Enable = Low 0.75 µA OCP Threshold ILIM 2.4V ≤ VIN ≤ 5.5V 0.6V ≤ VOUT ≤ 3.3V 1.25 1.4 A Feedback Pin Voltage Initial Accuracy V FB TA = 25°C, VIN = 3.6V; ILOAD = 100mA ; 0.8V ≤ VOUT ≤ 3.3V .588 0.6 0.612 V Feedback Pin Input Current IFB Note 1 <100 nA VS0-VS2, Pin Logic Low VVSLO 0.0 0.3 V VS0-VS2, Pin Logic High VVSHI 1.4 VIN V VS0-VS2, Pin Input Current IVSX Note 1 <100 nA Enable Pin Logic Low VENLO 0.3 V Enable Pin Logic High VENHI 1.4 V Enable Pin Current IENABLE Note 1 <100 nA Operating Frequency FOSC 5 MHz Soft Start Operation Soft Start Slew Rate ∆VSS EP5358LUA (VID MODE) EP5358HUA (VID MODE) 2.6 5.2 5.4
10.8 V/ms
VOUT Rise Time TRISE EP5358LUA VFB MODE 146 225 304 µs Note 1: Parameter guaranteed by design and characterization.
www.altera.com/enpirion, Page 5 Typical Performance Curves 100 0 100 200 300 400 500 600 EFFICIENCY (%) OUTPUT CURRENT (mA) Efficiency vs. IOUT (VIN = 3.3V) VOUT = 2.5V VOUT = 1.8V VOUT = 1.5V VOUT = 1.2V VOUT = 1.0V CONDITIONS VIN = 3.3V 0 100 200 300 400 500 600 EFFICIENCY (%) OUTPUT CURRENT (mA) Efficiency vs. IOUT (VIN = 5.0V) VOUT = 3.3V VOUT = 2.5V VOUT = 1.8V VOUT = 1.5V VOUT = 1.2V VOUT = 1.0V CONDITIONS VIN = 5V 0.980 0.985 0.990 0.995 1.000 1.005 1.010 1.015 1.020 0 100 200 300 400 500 600 OUTPUT VOLTAGE (V) OUTPUT CURRENT (mA) Output Voltage vs. Output Current VIN = 5.0V VIN = 3.3V CONDITIONS VOUT = 1.0V 1.180 1.185 1.190 1.195 1.200 1.205 1.210 1.215 1.220 0 100 200 300 400 500 600 OUTPUT VOLTAGE (V) OUTPUT CURRENT (mA) Output Voltage vs. Output Current VIN = 5.0V VIN = 3.3V CONDITIONS VOUT = 1.2V 1.480 1.485 1.490 1.495 1.500 1.505 1.510 1.515 1.520 0 100 200 300 400 500 600 OUTPUT VOLTAGE (V) OUTPUT CURRENT (mA) Output Voltage vs. Output Current VIN = 5.0V VIN = 3.3V CONDITIONS VOUT = 1.5V 1.780 1.785 1.790 1.795 1.800 1.805 1.810 1.815 1.820 0 100 200 300 400 500 600 OUTPUT VOLTAGE (V) OUTPUT CURRENT (mA) Output Voltage vs. Output Current VIN = 5.0V VIN = 3.3V CONDITIONS VOUT = 1.8V
www.altera.com/enpirion, Page 6 Typical Performance Curves (Continued) 2.480 2.485 2.490 2.495 2.500 2.505 2.510 2.515 2.520 0 100 200 300 400 500 600 OUTPUT VOLTAGE (V) OUTPUT CURRENT (mA) Output Voltage vs. Output Current VIN = 5.0V VIN = 3.3V CONDITIONS VOUT = 2.5V 3.280 3.285 3.290 3.295 3.300 3.305 3.310 3.315 3.320 0 100 200 300 400 500 600 OUTPUT VOLTAGE (V) OUTPUT CURRENT (mA) Output Voltage vs. Output Current VIN = 5.0V CONDITIONS VOUT = 3.3V 0.980 0.985 0.990 0.995 1.000 1.005 1.010 1.015 1.020 2.5 3 3.5 4 4.5 5 OUTPUT VOLTAGE (V) INPUT VOLTAGE (V) Output Voltage vs. Input Voltage LOAD = 600mA LOAD = 0A CONDITIONS VOUT_NOM = 1.0V 1.180 1.185 1.190 1.195 1.200 1.205 1.210 1.215 1.220 2.5 3 3.5 4 4.5 5 OUTPUT VOLTAGE (V) INPUT VOLTAGE (V) Output Voltage vs. Input Voltage LOAD = 600mA LOAD = 0A CONDITIONS VOUT_NOM = 1.2V 1.480 1.485 1.490 1.495 1.500 1.505 1.510 1.515 1.520 2.5 3 3.5 4 4.5 5 OUTPUT VOLTAGE (V) INPUT VOLTAGE (V) Output Voltage vs. Input Voltage LOAD = 600mA LOAD = 0A CONDITIONS VOUT_NOM = 1.5V 1.780 1.785 1.790 1.795 1.800 1.805 1.810 1.815 1.820 2.5 3 3.5 4 4.5 5 OUTPUT VOLTAGE (V) INPUT VOLTAGE (V) Output Voltage vs. Input Voltage LOAD = 600mA LOAD = 0A CONDITIONS VOUT_NOM = 1.8V
www.altera.com/enpirion, Page 7 Typical Performance Curves (Continued) 2.480 2.485 2.490 2.495 2.500 2.505 2.510 2.515 2.520 3 3.5 4 4.5 5 OUTPUT VOLTAGE (V) INPUT VOLTAGE (V) Output Voltage vs. Input Voltage LOAD = 600mA LOAD = 0A CONDITIONS VOUT_NOM = 2.5V 3.200 3.220 3.240 3.260 3.280 3.300 3.320 3.340 3.360 3.380 3.400 OUTPUT VOLTAGE (V) INPUT VOLTAGE (V) Output Voltage vs. Input Voltage LOAD = 600mA LOAD = 0A CONDITIONS VOUT_NOM = 3.3V 0.980 0.990 1.000 1.010 1.020 1.030 -50 -30 -10 10 30 50 70 90 110 OUTPUT VOLTAGE (V) AMBIENT TEMPERATURE (°C) Output Voltage vs. Temperature LOAD = 600mA LOAD = 0A CONDITIONS VIN = 5.0V VOUT_NOM = 1.0V 0.980 0.990 1.000 1.010 1.020 1.030 -50 -30 -10 10 30 50 70 90 110 OUTPUT VOLTAGE (V) AMBIENT TEMPERATURE (°C) Output Voltage vs. Temperature LOAD = 600mA LOAD = 0A CONDITIONS VIN = 3.3V VOUT_NOM = 1.0V 1.780 1.790 1.800 1.810 1.820 1.830 1.840 -50 -30 -10 10 30 50 70 90 110 OUTPUT VOLTAGE (V) AMBIENT TEMPERATURE (°C) Output Voltage vs. Temperature LOAD = 600mA LOAD = 0A CONDITIONS VIN = 3.3V VOUT_NOM = 1.8V 1.780 1.790 1.800 1.810 1.820 1.830 1.840 -50 -30 -10 10 30 50 70 90 110 OUTPUT VOLTAGE (V) AMBIENT TEMPERATURE (°C) Output Voltage vs. Temperature LOAD = 600mA LOAD = 0A CONDITIONS VIN = 5.0V VOUT_NOM = 1.8V
www.altera.com/enpirion, Page 8 Typical Performance Curves (Continued) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 55 60 65 70 75 80 85 90 95 100 105 MAXIMUM OUTPUT CURRENT (A) AMBIENT TEMPERATURE (°C) No De-rating (VIN = 3.3V) VOUT = 1.8V VOUT = 2.5V CONDITIONS VIN = 3.3V TJMAX = 125°C θJA = 85°C/W No Air Flow 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 55 60 65 70 75 80 85 90 95 100 105 MAXIMUM OUTPUT CURRENT (A) AMBIENT TEMPERATURE (°C) No De-rating (VIN = 5V) VOUT = 2.5V VOUT = 3.3V CONDITIONS VIN = 5.0V TJMAX = 125°C θJA = 85°C/W No Air Flow
www.altera.com/enpirion, Page 9 Typical Performance Characteristics VOUT (AC Coupled) Output Ripple at 20MHz Bandwidth CONDITIONS VIN = 5V VOUT = 1.2V IOUT = 500mA VOUT (AC Coupled) Output Ripple at 20MHz Bandwidth CONDITIONS VIN = 5V VOUT = 3.3V IOUT = 500mA VOUT (AC Coupled) Output Ripple at 20MHz Bandwidth CONDITIONS VIN = 3.3V VOUT = 1.8V IOUT = 500mA VOUT (AC Coupled) Output Ripple at 20MHz Bandwidth CONDITIONS VIN = 3.3V VOUT = 1.2V IOUT = 500mA ENABLE Enable Power Up CONDITIONS VIN = 5V VOUT = 3.3V (VID Mode) IOUT = 10mA VOUT ENABLE Enable Power Down CONDITIONS VIN = 5V VOUT = 3.3V (VID Mode) IOUT = 10mA VOUT
www.altera.com/enpirion, Page 10 Typical Performance Characteristics (Continued) ENABLE Enable Power Up CONDITIONS VIN = 5V VOUT = 3.3V (VID Mode) IOUT = 500mA VOUT ENABLE Enable Power Down CONDITIONS VIN = 5V VOUT = 3.3V (VID Mode) IOUT = 500mA VOUT VOUT (AC Coupled) Load Transient from 0 to 500mA CONDITIONS VIN = 5V VOUT = 1.2V LOAD VOUT (AC Coupled) Load Transient from 0 to 500mA CONDITIONS VIN = 3.3V VOUT = 1.8V LOAD
www.altera.com/enpirion, Page 11 Functional Block Diagram DAC Switch VREF (+) (-) Error Amp VSENSE VFB VOUT Package Boundry P-Drive N-Drive UVLO Thermal Limit Current Limit Soft Start Sawtooth Generator (+) (-) PWM Comp PVIN ENABLE PGND Logic Compensation Network NC(SW) Voltage Select VS0 VS1AVIN VS2AGND Figure 5: Functional Block Diagram
www.altera.com/enpirion, Page 12 Functional Description Functional Overview The EP5358x UA requires only 2 small MLCC capacitors for a complete DC -DC converter solution. The device integrates MOSFET switches, PWM controller, Gate -drive, compensation, and inductor into a tiny 2.5mm x 2.25mm x 1.1mm micro-QFN package. Advanced package design, along with the high level of integration, provides very low output ripple and noise. The EP5358x UA uses voltage mode control for high noise immunity and load matching to advanced ≤90nm loads. A 3- pin VID allows the user to choose from one of 8 output voltage settings. The EP5358x UA comes with two VID output voltage ranges. The EP5358HUA provides V OUT settings from 1.8V to 3.3V, the EP5358LUA provides VID settings from 0.8V to 1.5V, and also has an external resistor divider option to program output setting over the 0.6V to V IN-0.25V range. The EP5358x UA provides the industry’s highest power density of any 600mA DCDC converter solution. The key enabler of this revolutionary integration is Altera’s proprietary power MOSFET technology. The advanced MOSFET switches are implemented in deep- submicron CMOS to supply very low switching loss at high switching frequencies and to allow a high level of integration. The semiconductor process allows seem -less integration of all switching, control, and compensation circuitry. The proprietary magnetics design provides high- density/high-value magnetics in a very small footprint. Altera Enpirion magnetics are carefully matched to the control and compensation circuitry yielding an optimal solution with assured performance over the entire operating range. Protection features include under -voltage lock -out (UVLO), over-current protection (OCP), short circuit protection, and thermal overload protection. Integrated Inductor: Low-Noise Low-EMI The EP5358x UA utilizes a proprietary low loss integrated inductor. The integration of the inductor greatly simplifies the power supply design process. The inherent shielding and compact construction of the integrated inductor reduces the conducted and radiated noise that can couple into the traces of the printed circuit board. Further, the package layout is optimized to reduce the electrical path length for the high di/dT input AC ripple currents that are a major source of radiated emissions from DC -DC converters. The integrated inductor provides the optimal solution to the complexity, output ripple, and noise that plague low power DCDC converter design. Control Matched to sub 90nm Loads The EP5358x UA utilizes an integrated type III compensation network. Voltage mode control is inherently impedance matched to the sub 90nm process technology that is used in today’s advanced ICs. Voltage mode control also provides a high degree of noise immunity at light load currents so that low ripple and high accuracy are maintained over the entire load range. The very high switching frequency allows for a very wide control loop bandwidth and hence excellent transient performance. Soft Start Internal soft start circuits limit in -rush current when the device starts up from a power down condition or when the “ENABLE” pin is asserted “high”. Digital control circuitry limits the V OUT ramp rate to levels that are safe for the Power MOSFETS and the integrated inductor. The EP5358HUA has a soft -start slew rate that is twice that of the EP5358LUA. When the EP5358LUA is configured in external resistor divider mode, the device has a fixed VOUT ramp time. Therefore, the ramp rate will vary with the output voltage setting. Output voltage ramp time is given in the Electrical Characteristics Table. Excess bulk capacitance on the output of the device can cause an over -current condition at startup. The maximum total capacitance on the output, including the output filter capacitor and bulk and decoupling capacitance, at the load, is given as: EP5358LUA: C OUT_TOTAL_MAX = COUT_Filter + COUT_BULK = 230µF EP5358HUA: COUT_TOTAL_MAX = COUT_Filter + COUT_BULK = 115µF EP5358LUA in external divider mode: COUT_TOTAL_MAX = 2.086x10-4/VOUT Farads The above numbers and formula assume a no load
www.altera.com/enpirion, Page 13 condition. Over Current/Short Circuit Protection The current limit function is achieved by sensing the current flowing through a sense P -MOSFET which is compared to a reference current. When this level is exceeded the P -FET is turned off and the N -FET is turned on, pulling V OUT low. This condition is maintained for approximately 0.5mS and then a normal soft start is initiated. If the over current condition still persists, this cycle will repeat. Under Voltage Lockout During initial power up an under voltage lockout circuit will hold -off the switching circuitry until the input voltage reaches a sufficient level to insure proper operation. If the voltage drops below the UVLO threshold the lockout circuitry will again disable the switching. Hysteresis is included to prevent chattering between states. Enable The ENABLE pin provides a means to shut down the converter or enable normal operation. A logic low will disable the converter and cause it to shut down. A logic high will enable the converter into normal operation. NOTE: The ENABLE pin must not be left floating. Thermal Shutdown When excessive power is dissipated in the chip, the junction temperature rises. Once the junction temperature exceeds the thermal shutdown temperature the thermal shutdown circuit turns off the converter output voltage thus allowing the device to cool. When the junction temperature decreases by 15C°, the device will go through the normal startup process.
www.altera.com/enpirion, Page 14
Application Information
10µF 0805 X7R 4.7µF 0603 X7R VOUTPVIN AVIN PGND AGND VSENSE EP5358HUA VS0 VS1 VS2 ENABLE Figure 6. EP5358HUA Application Circuit Figure 7. EP5358LUA Application Circuit AGND to avoid noise coupling into the device. has an external divider option. range, order part number EP5358HUA. NOTE: The VID pins must not be left floating. implement glitch-free voltage scaling. Table 1. EP5358LUA VID Voltage Select Settings IN or a logic “1” or “high”. be connected to VOUT as indicated in Figure 8.
Figure 8. EP5358LUA Using External Divider while the device is enabled. Figure 9. EP5358xUA with RC inserted in VSENSE path to modify VID output voltages. NEW is the desired “new” VOUT.
www.altera.com/enpirion, Page 16 VOUTOLD is the VID table output voltage. For a given Rs Value, the VOUTNEW for VID settings is determined by the following equations: EP5358LUA: VoltsRsVOUTVOUT L OLDNEW + = 1711 EP5358HUA: VoltsRsVOUTVOUT H OLDNEW + = 1356 NOTE: The amount of adjustment is limited to approximately 15% of the nominal VID setting. NOTE: Adjusting VOUT using this method will increase the tolerance of the output voltage. The larger the adjustment, the greater the increase in tolerance. Power-Up/Down During power-up, ENABLE should not be asserted before PVIN, and PVIN should not be asserted before AVIN. The PVIN should never be powered when AVIN is off. During power down, the AVIN should not be powered down before the PVIN. Tying PVIN and AVIN or all three pins (AVIN, PVIN, ENABLE) together during power up or power down meets these requirements. The EP5358xUA supports startup into a pre -biased output of up to 1.5V. The output of the EP5358xUA can be pre -biased with a voltage up to 1.5V when the EP5358xUA is first enabled. Input Filter Capacitor The input capacitor requirement is a minimum of 4.7µF 0603 X7R MLCC. Y5V or equivalent dielectric formulations lose capacitance with frequency, bias, and with temperature, and are not suitable for switch- mode DC -DC converter input filter applications. Output Filter Capacitor The output filter capacitor requirement is a minimum of 10µF 0805 X7R MLCC. Ripple performance can be improved by using 2x10µF 0805 X7R MLCC capacitors (for any allowed VIN). The maximum output filter capacitance next to the output pins of the device is 60µF low ESR MLCC capacitance. VOUT has to be sensed at the last output filter capacitor next to the EP5358xUA. Additional bulk capacitance for decoupling and bypass can be placed at the load as long as there is sufficient separation between the VOUT Sense point and the bulk capacitance. Excess total capacitance on the output (Output Filter + Bulk) can cause an over -current condition at startup. Refer to the section on Soft-Start for the maximum total capacitance on the output. The output capacitor must use a X5R or X7R or equivalent dielectric formulation. Y5V or equivalent dielectric formulations lose capacitance with frequency, bias, and temperature and are not suitable for switch- mode DC -DC converter output filter applications.
PowerSoC helps alleviate some of those concerns. temperature for continuous operation is 125°C. the thermal performance of the EP5358xUA. First calculate the output power. efficiency (η) shown in Figure 10. Figure 10. Efficiency vs. Output Current output power from the input power. JA value of 85 ºC/W without airflow. ambient temperature to be 25°C.
www.altera.com/enpirion, Page 18 Layout Recommendation Figure 11 shows critical components and layer 1 traces of a recommended minimum footprint EP5358LUA/EP5358HUA layout with ENABLE tied to VIN. Alternate ENABLE configurations, and other small signal pins need to be connected and routed according to specific customer application. Please see the Gerber files on the Altera website www.altera.com/enpirion for exact dimensions and other layers. Please refer to Figure 11 while reading the layout recommendations in this section. Recommendation 1: Input and output filter capacitors should be placed on the same side of the PCB, and as close to the EP5358UA package as possible. They should be connected to the device with very short and wide traces. Do not use thermal reliefs or spokes when connecting the capacitor pads to the respective nodes. The +V and GND traces between the capacitors and the EP5358UA should be as close to each other as possible so that the gap between the two nodes is minimized, even under the capacitors. Recommendation 2: Input and output grounds are separated until they connect at the PGND pins. The separation shown on Figure 11 between the input and output GND circuits helps minimize noise coupling between the converter input and output switching loops. Recommendation 3: The system ground plane should be the first layer immediately below the surface layer. This ground plane should be continuous and un -interrupted below the converter and the input/output capacitors. Please see the Gerber files on the Altera website www.altera.com/enpirion Figure 11: Top PCB Layer Critical Components and Copper for Minimum Footprint Recommendation 4: Multiple small vias should be used to connect the ground traces under the device to the system ground plane on another layer for heat dissipation. The drill diameter of the vias should be 0.33mm, and the vias must have at least 1 oz. copper plating on the inside wall, making the finished hole size around 0.20-0.26mm. Do not use thermal reliefs or spokes to connect the vias to the ground plane. It is preferred to put these vias under the capacitors along the edge of the GND copper closest to the +V copper. Please see Figure 11. These vias connect the input/output filter capacitors to the GND plane and help reduce parasitic inductances in the input and output current loops. If the vias cannot be placed under C IN and COUT, then put them just outside the capacitors along the GND. Do not use thermal reliefs or spokes to connect these vias to the ground plane. Recommendation 5: AVIN is the power supply for the internal small-signal control circuits. It should be connected to the input voltage at a quiet point. In Figure 11 this connection is made at the input capacitor close to the V IN connection.
Figure 12. EP5358xUA PCB Footprint (Top View)
Figure 13. EP5358LUA Package Dimensions (Bottom View)
Figure 14. EP5358HUA Package Dimensions (Bottom View)