EP5358LUI/EP5358HUI 600mA Synchronous Buck Regulator with Integrated Inductor RoHS Compliant; Halogen Free Description Features The EP5358xUI (x = L or H) is rated for up to 600mA of continuous output current. The EP5358xUI integrates MOSFET switches, control, compensation, and the magnetics in an advanced 2.5mm x 2.25mm micro-QFN Package. * Integrated Inductor Technology * 2.5mm x 2.25mm x 1.1mm uQFN package * Total Solution Footprint 12mm2 * Low VOUT ripple for RF compatibility * High efficiency, up to 93% Integrated magnetics enables a tiny solution footprint, low output ripple, low part-count, and high reliability, while maintaining high efficiency. The complete solution can be implemented in as little as 12mm2. * Up to 600mA continuous output current * Less than 1A standby current * 5 MHz switching frequency * 3 pin VID for glitch free voltage scaling The EP5358xUI uses a 3-pin VID to easily select the output voltage setting. Output voltage settings are available in 2 optimized ranges providing coverage for typical VOUT settings. * VOUT Range 0.6V to VIN - 0.25V * Short circuit and over current protection * UVLO and thermal protection The VID pins can be changed on the fly for fast dynamic voltage scaling. EP5358LUI further has the option to use an external voltage divider. * IC level reliability in a PowerSOC solution The EP5358xUI is a perfect solution for noise sensitive and space constrained applications that require high efficiency. Application * Wireless and RF applications * Wireless broad band data cards * Smart phone and portable media players * Advanced Low Power Processors, DSP, IO, Memory, Video, Multimedia Engines AVIN VSENSE PVIN VOUT VOUT ENABLE 10uF 2.25mm 2.2uF VIN 2.2uF EP5358xUI EP5358HUI 10uF VS0 VS1 VS2 PGND AGND 4.75mm Figure 2: Typical Application Schematic Figure 1: Total Solution Footprint. www.enpirion.com 03541 09/23/2010 Rev: D EP5358LUI/EP5358HUI EP5358LUI LOW VID Range 16-pin QFN T&R EP5358HUI HIGH VID Range 16-pin QFN T&R EP5358LUI-E EP5358LUI Evaluation Board EP5358HUI-E EP5358HUI Evaluation Board NC(SW) 1 PGND 2 PGND 3 VFB 4 VSENSE 5 AGND 6 NC(SW) Package NC(SW) Comment 16 15 EP5358LUI Part Number Pin Assignments (Top View) 14 PVIN 13 AVIN 12 ENABLE 11 10 VS1 9 VOUT 7 VS0 VS2 8 VOUT Ordering Information 2 PGND 3 NC 4 VSENSE 5 AGND 6 NC(SW) 15 EP5358HUI PGND 16 14 PVIN 13 AVIN 12 ENABLE 11 VS0 10 VS1 9 7 8 VOUT 1 VOUT NC(SW) NC(SW) Figure 3: EP5358LUI Pin Out Diagram (Top View) VS2 Figure 4: EP5358HUI Pin Out Diagram (Top View) Pin Description PIN NAME 1, 15, 16 NC(SW) 2,3 PGND 4 VFB/NC 5 VSENSE 6 AGND 7, 8 VOUT 9, 10, 11 VS2, VS1, VS0 12 13 14 ENABLE AVIN PVIN FUNCTION NO CONNECT - These pins are internally connected to the common switching node of the internal MOSFETs. NC (SW) pins are not to be electrically connected 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 to the device. Power ground. Connect these pins together and to the ground electrode of the Input and output filter capacitors. EP5358LUI: Feed back pin for external divider option. EP5358HUI: No Connect Sense pin for preset output voltages. Refer to application section for proper configuration. Analog ground. This is the quiet ground for the internal control circuitry, and the ground return for external feedback voltage divider Regulated Output Voltage. Refer to application section for proper layout and decoupling. Output voltage select. VS2 = pin 9, VS1 = pin 10, VS0 = pin 11. EP5358LUI: Selects one of seven preset output voltages or an external resistor divider. EP5358HUI: Selects one of eight preset output voltages. (Refer to section on output voltage select for more details.) Output Enable. Enable = logic high; Disable = logic low Input power supply for the controller circuitry. Input Voltage for the MOSFET switches. Enpirion 2010 all rights reserved, E&OE 03541 2 09/23/2010 www.enpirion.com Rev: D EP5358LUI/EP5358HUI 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 cause permanent damage to the device. Exposure to absolute maximum rated conditions for extended periods may affect device reliability. PARAMETER SYMBOL MIN MAX UNITS VIN -0.3 6.0 V Voltages on: ENABLE, VSENSE, VSO - VS2 -0.3 VIN+ 0.3 V Voltages on: VFB (EP5358LUI) -0.3 2.7 V 150 C 150 C Reflow Temp, 10 Sec, MSL3 JEDEC J-STD-020C 260 C ESD Rating (based on Human Body Mode) 2000 V Input Supply Voltage Maximum Operating Junction Temperature TJ-ABS Storage Temperature Range TSTG -65 Recommended Operating Conditions PARAMETER SYMBOL MIN MAX UNITS Input Voltage Range VIN 2.4 5.5 V Operating Ambient Temperature TA -40 +85 C Operating Junction Temperature TJ -40 +125 C Thermal Characteristics PARAMETER Thermal Resistance: Junction to Ambient -0 LFM (Note 1) Thermal Overload Trip Point Thermal Overload Trip Point Hysteresis SYMBOL TYP UNITS JA 85 C/W TJ-TP +155 C 25 C Note 1: Based on a four layer copper board and proper thermal design per JEDEC EIJ/JESD51 standards Enpirion 2010 all rights reserved, E&OE 03541 3 09/23/2010 www.enpirion.com Rev: D EP5358LUI/EP5358HUI Electrical Characteristics NOTE: TA = -40C to +85C unless otherwise noted. Typical v alues are at TA = 25C, VIN = 3.6V. CIN = 4.7F MLCC, COUT = 10F PARAMETER SYMBOL TEST CONDITIONS MIN TYP Operating Input Voltage Range VIN 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. Output Voltage Range VOUT EP5358LUI (VDO = ILOAD X RDO) EP5358HUI Dynamic Voltage Slew Rate (VID Change) VSLEW EP5358LUI EP5358HUI VID Preset VOUT Initial Accuracy VOUT TA = 25C, VIN = 3.6V; ILOAD = 100mA ; 0.8V VOUT 3.3V Line Regulation VOUT_LINE 2.4V VIN 5.5V 0.03 %/V Load Regulation VOUT_LOAD 0A ILOAD 600mA 0.48 %/A Temperature Variation VOUT_TEMPL -40C TA +85C 24 ppm/C Output Current IOUT Shut-down Current ISD Enable = Low OCP Threshold ILIM 2.4V VIN 5.5V 0.6V VOUT 3.3V Feedback Pin Voltage Initial Accuracy VFB TA = 25C, VIN = 3.6V; ILOAD = 100mA ; 0.8V VOUT 3.3V Feedback Pin Input Current IFB Note 1 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 Enable Pin Logic Low VENLO Enable Pin Logic High VENHI Enable Pin Current IENABLE Operating Frequency FOSC 2.4 350 0.6 1.8 MAX UNITS 5.5 V 500 VIN-VDO 3.3 4 8 m V V/mS -2 +2 600 % mA 0.75 A 1.25 1.4 A .588 0.6 0.612 <100 Note 1 nA <100 nA 0.3 1.4 Note 1 V V V <100 nA 5 MHz Soft Start Operation Soft Start Slew Rate VSS EP5358LUI (VID MODE) EP5358HUI (VID MODE) 2.6 5.2 4 8 5.4 10.8 V/mS VOUT Rise Time TRISE EP53A8LUI VFB MODE 146 225 304 uSec Note 1: Parameter guaranteed by design Enpirion 2010 all rights reserved, E&OE 03541 4 09/23/2010 www.enpirion.com Rev: D EP5358LUI/EP5358HUI 95 90 85 80 75 70 65 60 55 50 45 Efficiency (%) Efficiency (%) Typical Performance Characteristics 0 200 400 Load Current (mA) 600 0 Efficiency vs. Load Current: VIN = 5.0V, VOUT (from top to bottom) = 3.3, 2.5, 1.8, 1.2V Efficiency (%) 95 90 85 80 75 70 65 60 55 50 45 200 400 Load Current (mA) 600 Efficiency vs. Load Current: VIN = 3.7V, VOUT (from top to bottom) = 2.5, 1.8, 1.2V 95 90 85 80 75 70 65 60 55 50 45 0 200 400 Load Current (mA) 600 Efficiency vs. Load Current: VIN = 3.3V, VOUT (from top to bottom) = 2.5, 1.8, 1.2V Start Up Waveform: VIN = 5.0V, VOUT = 3.3V; ILOAD = 500mA (VID MODE) Start Up Waveform: VIN = 5.0V, VOUT = 3.3V; ILOAD = 10mA (VID MODE) Enpirion 2010 all rights reserved, E&OE 03541 5 09/23/2010 www.enpirion.com Rev: D EP5358LUI/EP5358HUI Shut-down Waveform: VIN = 5.0V, VOUT = 3.3V; ILOAD = 10mA Shut-down Waveform: VIN = 5.0V, VOUT = 3.3V; ILOAD = 500mA Output Ripple: VIN = 5.0V, VOUT = 1.2V, Load = 500mA Output Ripple: VIN = 5.0V, VOUT = 3.3V Load = 500mA Output Ripple: VIN = 3.3V, VOUT = 1.8V Load = 500mA Output Ripple: VIN = 3.3V, VOUT = 1.2V, Load = 500mA Enpirion 2010 all rights reserved, E&OE 03541 6 09/23/2010 www.enpirion.com Rev: D EP5358LUI/EP5358HUI Load Transient: VIN = 3.3V, VOUT = 1.8V Load stepped from 10mA to 500mA Load Transient: VIN = 5.0V, VOUT = 1.2V Load stepped from 10mA to 500mA Enpirion 2010 all rights reserved, E&OE 03541 7 09/23/2010 www.enpirion.com Rev: D EP5358LUI/EP5358HUI Functional Block Diagram PVIN EP5358UI UVLO Thermal Limit Current Limit ENABLE NC(SW) Soft Start P-Drive Logic (-) VOUT PWM Comp (+) N-Drive GND VSENSE Sawtooth Generator Compensation Network (-) Switch Error Amp VFB (+) DAC Voltage Select VREF Package Boundry AVIN VS0 VS1 VS2 AGND Figure 5: Functional Block Diagram Enpirion 2010 all rights reserved, E&OE 03541 8 09/23/2010 www.enpirion.com Rev: D EP5358LUI/EP5358HUI Detailed Description Functional Overview Integrated Inductor: Low-Noise Low-EMI The EP5358xUI 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 EP5358xUI 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 EP5358xUI comes with two VID output voltage ranges. The EP5358HUI provides VOUT settings from 1.8V to 3.3V, the EP5358LUI 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 VIN-0.25V range. The EP5358xUI provides the industry's highest power density of any 600mA DCDC converter solution. The EP5358xUI 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. The key enabler of this revolutionary integration is Enpirion'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. 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 lockout (UVLO), over-current protection (OCP), short circuit protection, and thermal overload protection. Enpirion 2010 all rights reserved, E&OE 03541 Control Matched to sub 90nm Loads The EP5358xUI 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 VOUT ramp rate to levels that are safe for the Power MOSFETS and the integrated inductor. The EP5358HUI has a soft-start slew rate that is twice that of the EP5358LUI. When the EP5358LUI 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. 9 09/23/2010 www.enpirion.com Rev: D EP5358LUI/EP5358HUI 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: EP5358LUI: COUT_TOTAL_MAX = COUT_Filter + COUT_BULK = 230uF EP5358HUI: COUT_TOTAL_MAX = COUT_Filter + COUT_BULK = 115uF 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 EP5358LUI in external divider mode: COUT_TOTAL_MAX = 2.086x10-4/VOUT Farads The above numbers and formula assume a no load condition. Over Current/Short Circuit Protection The current limit function is achieved by sensing the current flowing through a sense PMOSFET which is compared to a reference current. When this level is exceeded the PFET is turned off and the N-FET is turned on, pulling VOUT 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. Enpirion 2010 all rights reserved, E&OE 03541 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. 10 09/23/2010 www.enpirion.com Rev: D EP5358LUI/EP5358HUI Application Information VOUT PVIN VIN VOUT VSENSE AVIN ENABLE 10F 4.7F input of the error amplifier. This allows the use of a single feedback divider with constant loop gain and optimum compensation, independent of the output voltage selected. NOTE: The VID pins must not be left floating. VS0 EP5358L Low VID Range Programming VS1 VS2 PGND AGND Figure 6: Application Circuit, EP5358HUI,. VOUT PVIN VIN VOUT VSENSE AVIN ENABLE 4.7F 10F VFB VS0 The EP5358LUI is designed to provide a high degree of flexibility in powering applications that require low VOUT settings and dynamic voltage scaling (DVS). The device employs a 3-pin VID architecture that allows the user to choose one of seven (7) preset output voltage settings, or the user can select an external voltage divider option. The VID pin settings can be changed on the fly to implement glitchfree voltage scaling. Table 1: EP5358LUI VID Voltage Select Settings VS1 VS2 PGND AGND VS2 0 0 0 0 1 1 1 1 Figure 7: Application Circuit, EP5358LUI, showing the VFB function. Output Voltage Programming The EP5358xUI utilizes a 3-pin VID to program the output voltage value. The VID is available in two sets of output VID programming ranges. The VID pins should be connected either to AVIN or to AGND to avoid noise coupling into the device. The "Low" range is optimized for low voltage applications. It comes with preset VID settings ranging from 0.80V and 1.5V. This VID set also has an external divider option. To specify this VID range, order part number EP5358LUI. The "High" VID set provides output voltage settings ranging from 1.8V to 3.3V. This version does not have an external divider option. To specify this VID range, order part number EP5358HUI. Internally, the output of the VID multiplexer sets the value for the voltage reference DAC, which in turn is connected to the non-inverting Enpirion 2010 all rights reserved, E&OE 03541 VS1 0 0 1 1 0 0 1 1 VS0 0 1 0 1 0 1 0 1 VOUT 1.50 1.45 1.20 1.15 1.10 1.05 0.8 EXT Table 1 shows the VS2-VS0 pin logic states for the EP5358LUI and the associated output voltage levels. A logic "1" indicates a connection to AVIN or to a "high" logic voltage level. A logic "0" indicates a connection to AGND or to a "low" logic voltage level. These pins can be either hardwired to AVIN or AGND or alternatively can be driven by standard logic levels. Logic levels are defined in the electrical characteristics table. Any level between the logic high and logic low is indeterminate. EP5358LUI External Voltage Divider The external divider option is chosen by connecting VID pins VS2-VS0 to VIN or a logic "1" or "high". The EP5358LUI uses a separate feedback pin, VFB, when using the external divider. VSENSE must be connected to VOUT as indicated in figure 8. 11 09/23/2010 www.enpirion.com Rev: D EP5358LUI/EP5358HUI PVIN VSENSE AVIN 4.7uF ENABLE VSO VS1 VS2 EP5358LUI VIN VOUT VOUT Ra logic high and logic low is indeterminate. These pins must not be left floating. 10F Table 2: EP5358HUI VID Voltage Select Settings VFB VS2 0 0 0 0 1 1 1 1 Rb PGND AGND Figure 8: EP5358LUI using external divider The output voltage is selected by the following formula: VOUT = 0.6V (1 + Ra Rb ) = b 142.2 x10 3 VOUT - 0.6 Table 2 shows the VS0-VS2 pin logic states for the EP5358HUI and the associated output voltage levels. A logic "1" indicates a connection to AVIN or to a "high" logic voltage level. A logic "0" indicates a connection to AGND or to a "low" logic voltage level. These pins can be either hardwired to AVIN or AGND or alternatively can be driven by standard logic levels. Logic levels are defined in the electrical characteristics table. Any level between the Enpirion 2010 all rights reserved, E&OE 03541 Rs VOUT EP5358xUI 4.7uF 10uF VSENSE VSO VS1 VS2 5.0pF ENABLE AGND PGND NOTE: Dynamic Voltage Scaling is not allowed between internal preset voltages and external divider. The EP5358HUI VOUT settings are optimized for higher nominal voltages such as those required to power IO, RF, or IC memory. The preset voltages range from 1.8V to 3.3V. There are eight (8) preset output voltage settings. The EP5358HUI does not have an external divider option. As with the EP5358LUI, the VID pin settings can be changed while the device is enabled. VOUT 3.3 3.0 2.9 2.6 2.5 2.2 2.1 1.8 AVIN PVIN VOUT can be programmed over the range of 0.6V to (VIN - 0.25V). EP5358HUI High VID Range Programming VS0 0 1 0 1 0 1 0 1 Custom VID Setting Adjustment Ra must be chosen as 237K to maintain loop gain. Then Rb is given as: R VS1 0 0 1 1 0 0 1 1 Figure 9: EP5358xUI with RC inserted in VSENSE path to modify VID output voltages. It is possible to adjust VOUT for a given VID setting by inserting a parallel RC combination in the VSENSE path as shown in figure 9. The capacitor value is 5.0pF to ensure stability. Note that the value of VOUT can only be increased from its nominal setting (VOUTNEW>VOUTOLD): For EP5358LUI: VOUTNEW Rs L = 711* - 1 kOhms VOUTOLD For EP5358HUI: VOUTNEW - 1 kOhms Rs H = 356 * VOUTOLD VOUTNEW is the desired "new" VOUT. VOUTOLD is the VID table output voltage. 12 09/23/2010 www.enpirion.com Rev: D EP5358LUI/EP5358HUI For a given Rs Value, the VOUTNEW for VID settings is determined by the following equations: EP5358LUI: VOUTNEW Rs = VOUTOLD L + 1Volts 711 EP5358HUI: Rs VOUTNEW = VOUTOLD H + 1Volts 356 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. Input Filter Capacitor For ILOAD 500mA, CIN = 2.2uF For ILOAD > 500mA CIN = 4.7uF. 0402 capacitor case size is acceptable. The input capacitor must use a X5R or X7R or equivalent dielectric formulation. Y5V or equivalent dielectric formulations lose capacitance with frequency, bias, and with Enpirion 2010 all rights reserved, E&OE 03541 temperature, and are not suitable for switchmode DC-DC converter input filter applications. Output Filter Capacitor For VIN 4.3V, COUT_MIN = 10uF 0603 MLCC. For VIN > 4.3V, COUT_MIN = 10uF 0805 MLCC. Ripple performance can be improved by using 2x10F 0603 MLCC capacitors (for any allowed VIN). The maximum output filter capacitance next to the output pins of the device is 60F low ESR MLCC capacitance. VOUT has to be sensed at the last output filter capacitor next to the EP5358xUI. 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 switchmode DC-DC converter output filter applications. 13 09/23/2010 www.enpirion.com Rev: D EP5358LUI/EP5358HUI Recommended PCB Footprint Figure 10: EP5358xUI Package PCB Footprint Enpirion 2010 all rights reserved, E&OE 03541 14 09/23/2010 www.enpirion.com Rev: D EP5358LUI/EP5358HUI Package and Mechanical Figure 11: EN5358xUI Package Dimensions Enpirion 2010 all rights reserved, E&OE 03541 15 09/23/2010 www.enpirion.com Rev: D EP5358LUI/EP5358HUI Contact Information Enpirion, Inc. Perryville III 53 Frontage Road Suite 210 Hampton, NJ 08827 Phone: +1 908-894-6000 Fax: +1 908-894-6090 Enpirion reserves the right to make changes in circuit design and/or specifications at any time without notice. Information furnished by Enpirion is believed to be accurate and reliable. Enpirion assumes no responsibility for its use or for infringement of patents or other third party rights, which may result from its use. Enpirion products are not authorized for use in nuclear control systems, as critical components in life support systems or equipment used in hazardous environment without the express written authority from Enpirion. Enpirion 2010 all rights reserved, E&OE 03541 16 09/23/2010 www.enpirion.com Rev: D