Power Management

ECJ-2FB1A226M

Enpirion, Inc.

15A Voltage Mode Synchronous Buck PWM

Manufacturer: Enpirion, Inc.

Document: 26 Pages / 1Mb

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Document overview

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PDF pages: 26

Technical content

Features

Integrated Inductor, MOSFETs, Controller
Total Solution Size Estimate 308mm 2
Wide Input Voltage Range: 4.5V – 14V
2% V OUT Accuracy (Over Line/Load/Temperature)
Master/Slave Configuration for Parallel Operation o Up to 4 Devices with 48A capability
Frequency Synchronization (External Clock)
Output Enable Pin and Power OK Signal
Programmable Soft-Start Time
Under Voltage Lockout Protection (UVLO)
Programmable Over Current Protection
Thermal Shutdown and Short Circuit Protection
RoHS compliant, MSL level 3, 260 oC reflow

Applications

Space Constrained Applications
Distributed Power Architectures
Output Voltage Ripple Sensitive Applications
Beat Frequency Sensitive Applications
Servers, Embedded Computing Systems, LAN/SAN Adapter Cards, RAID Storage Systems, Industrial Automation, Test and Measurement, and Telecommunications

Figure 1. Simplified Applications Circuit

Ordering Information

Part Number Package Markings Temp Rating (°C) Package Description EN23F0QI EN23F0QI -40 to +85 92-pin (12mm x 13mm x 3mm) QFN T&R EN23F0QI-E EN23F0QI QFN Evaluation Board Packing and Marking Information: http://www.enpirion.com/resource-center-packing-and-marking-information.htm Pin Assignments (Top View) Figure 3: 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 : Shaded area highlights exposed metal below the package that is not to be mechanically or electrically connected to the PCB. Refer to Figure 14 for details. NOTE C: White ‘dot’ on top left is pin 1 indicator on top of the device package.

©Enpirion 2012 all rights reserved, E&OE Enpirion Confidential www.enpirion.com, Page 3 Pin Description I/O Legend: P=Power G=Ground NC=No Connect I=Input O=Output I/O=Input/Output PIN NAME I/O FUNCTION 1-24, 36, 81 NC NC NO CONNECT – These pins may be internally connected. Do not connect them to each other or to any other electrical signal. Failure to follow this guideline may result in device damage. 25-35 VOUT O Regulated converter output. Connect these pins to the load and place output capacitor between these pins and PGND pins 40-42. 37-39, 83-92 NC(SW) NC NO CONNECT – These pins are internally connected to the common switching node of the internal MOSFETs. They are not to be electrically connected to any external signal, ground, or voltage. Failure to follow this guideline may result in damage to the device. 40-46 PGND G Input/Output power ground. Connect these pins to the ground electrode of the input and output filter capacitors. See VOUT and PVIN pin descriptions for more details. 47-63 PVIN P Input power supply. Connect to input power supply. Decouple with input capacitor to PGND pins 43-46.

64 AVINO O

Internal 3.3V linear regulator output. Connect this pin to AVIN (Pin 73) for applications where operation from a single input voltage (PVIN) is required. If AVINO is being used, place a 1µF, X5R/X7R, capacitor between AVINO and AGND as close as possible to AVINO. 65 PG I/O Place a 0.1µF, X7R, capacitor between this pin and BTMP. 66 BTMP I/O See pin 65 description. 67 VDDB O Internal regulated voltage used for the internal control circuitry. Place a 1µF, X7R, capacitor between this pin and BGND. 68 BGND G See pin 67 description. 69 S_IN I Digital Input. This pin accepts either an input clock to phase lock the internal switching frequency or a S_OUT signal from another EN23F0QI. Leave this pin floating if not used. 70 S_OUT O Digital Output. PWM signal is output on this pin. Leave this pin floating if not used.

71 POK O

Power OK is an open drain transistor (pulled up to AVIN or similar voltage) used for power system state indication. POK is logic high when VOUT is -10% of VOUT nominal. Leave this pin floating if not used. 72 ENABLE I Input Enable. Applying a logic high to this pin enables the output and initiates a soft-start. Applying a logic Low disables the output. Do not leave this pin floating. 73 AVIN P 3.3V Input power supply for the controller. Place a 0.1µF, X7R, capacitor between AVIN and AGND. 74 AGND G Analog Ground. This is the ground return for the controller. Needs to be connected to a quiet ground.

75 M/S I A logic level low configures the device as Master and a logic level high configures the

device as a Slave. Connect to ground in standalone mode.

76 VFB I/O

External Feedback Input. The feedback loop is closed through this pin. A voltage divider at VOUT is used to set the output voltage. The mid-point of the divider is connected to VFB. A phase lead capacitor from this pin to VOUT is also required to stabilize the loop. 77 EAIN O Optional Error Amplifier Input. Allows for customization of the control loop for performance optimization. Leave this pin floating if unused.

78 SS I/O

Soft-Start node. The soft-start capacitor is connected between this pin and AGND. The value of this capacitor determines the startup time. See Soft-Start Operation in the Functional Description section for details.

79 RCLX I/O

Programmable over-current protection. Placement of a resistor on this pin will adjust the over-current protection threshold. See Table 2 for the recommended RCLX Value to set OCP at the nominal value specified in the Electrical Characteristics table. No current limit protection when this pin is left floating.

80 FADJ I/O

Adding a resistor (RFS) to this pin will adjust the switching frequency of the EN23F0QI. See Table 1 for suggested resistor values on RFS for various PVIN/VOUT combinations to maximize efficiency. Do not leave this pin floating. 82 CGND G Connect to GND plane at all times. 93 PGND G Not a perimeter pin. Device thermal pad to be connected to the system GND plane for heat- sinking purposes.

©Enpirion 2012 all rights reserved, E&OE Enpirion Confidential www.enpirion.com, Page 4 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 ma ximum ratings may impair device life. Exposure to absolute maximum rated conditions for extended periods may affect device reliability. PARAMETER SYMBOL MIN MAX UNITS Voltages on : PVIN, VOUT -0.5 15 V Pin Voltages – AVINO, AVIN, ENABLE, POK, S_IN, S_OUT, M/S 2.5 6.0 V Pin Voltages – VFB, SS, EAIN, RCLX, FADJ -0.5 2.75 V PVIN Slew Rate 0.3 3 V/ms Storage Temperature Range TSTG -65 150 °C Maximum Operating Junction Temperature T J-ABS Max 150 °C Reflow Temp, 10 Sec, MSL3 JEDEC J-STD-020A 260 °C ESD Rating (based on Human Body Model) 2000 V ESD Rating (based on CDM) 500 V Recommended Operating Conditions PARAMETER SYMBOL MIN MAX UNITS Input Voltage Range PVIN 4.5 14.0 V AVIN: Controller Supply Voltage AVIN 2.5 5.5 V Output Voltage Range (Note 1) V OUT 0.75 3.3 V Output Current I OUT 15 A Operating Ambient Temperature TA -40 +85 °C Operating Junction Temperature T J -40 +125 °C Thermal Characteristics PARAMETER SYMBOL TYP UNITS Thermal Shutdown T SD 160 °C Thermal Shutdown Hysteresis T SDH 35 °C Thermal Resistance: Junction to Ambient (0 LFM) (Note 2) θJA 13 °C/W Thermal Resistance: Junction to Case (0 LFM) θJC 1 °C/W Note 1 : RCLX resistor value may need to be raised for V OUT > V IN – 2.5V to increase current limit threshold. Contact techsupport@enpirion.com for details. Note 2: Based on 2oz. external copper layers and proper thermal design in line wi th EIJ/JEDEC JESD51-7 standard for high thermal conductivity boards.

Electrical Characteristics

NOTE: VIN=12V, 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 PVIN 4.5 14.0 V Controller Input Voltage AVIN 2.5 5.5 V PVIN Under Voltage Lock-out UVLO PVIN Voltage above which UVLO is not asserted 2 V AVIN Under Voltage Lock-out rising AVINUVLOR Voltage above which UVLO is not asserted 2.3 V AVIN Under Voltage Lock-out falling AVINOVLOF Voltage below which UVLO is asserted 2.1 V AVIN Pin Input Current I AVIN 14 mA Internal Linear Regulator Output Voltage AVINO 3.3 V Shut-Down Supply Current IPVINS PVIN=12V, AVIN=3.3, ENABLE=0V 300 μA IAVINS PVIN=12V, AVIN=3.3, ENABLE=0V 50 μA Feedback Pin Voltage V FB Feedback Node Voltage at: VIN = 12V, ILOAD = 0, TA = 25°C 0.594 0.60 0.606 V Feedback Pin Voltage V FB Feedback Node Voltage at: 4.5V ≤ VIN ≤ 14V 0A ≤ ILOAD ≤ 15A, TA = -40 to 85°C 0.588 0.60 0.612 V Feedback pin Input Leakage Current IFB VFB pin input leakage current (Note 3) -5 5 nA VOUT Rise Time t RISE CSS = 47nF (Note 3, Note 4 and Note 5) 1.96 2.8 3.64 ms Soft Start Capacitor Range CSS_RANGE 47 nF Continuous Output Current IOUT_CONT 0 15 A Over Current Trip Level I OCP Reference Table 3 22.5 A ENABLE Logic High V ENABLE_HIGH 4.5V ≤ VIN ≤ 14V; 1.8 AV IN V ENABLE Logic Low V ENABLE_LOW 4.5V ≤ VIN ≤ 14V; 0 0.6 V ENABLE Lockout Time T ENLOCKOUT 8 ms ENABLE pin Input Current IENABLE 180kΩ Pull Down (Note 3) 4 μA Switching Frequency F SW RFADJ =3k Ω 1.0 MHz External SYNC Clock Frequency Lock Range FPLL_LOCK Range of SYNC clock frequency 0.8 1.6 MHz S_IN Threshold – Low V S_IN_LO S_IN Clock Logic Low Level 0.8 V S_IN Threshold – High V S_IN_HI S_IN Clock Logic High Level 1.8 2.5 V S_OUT Threshold – Low V S_OUT_LO S_OUT Clock Logic Low Level 0.8 V S_OUT Threshold – High VS_OUT_HI S_OUT Clock Logic High Level 1.8 2.5 V POK Lower Threshold POK LT Percentage of Nominal Output Voltage for POK to be Low 90 %

©Enpirion 2012 all rights reserved, E&OE Enpirion Confidential www.enpirion.com, Page 6 PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS POK Output low Voltage V POKL With 4mA Current Sink into POK 0.4 V POK Output Hi Voltage V POKH PVIN range: 4.5V ≤ VIN ≤ 15V AVIN V POK pin VOH leakage current IPOKL POK High (Note 3) 1 µA M/S Pin Logic Low V T-LOW Tie Pin to GND 0.8V V M/S Pin Logic High V T-HIGH Pull up to AVIN Through an External Resistor REXT 1.8V V M/S Pin Input Current I M/S VIN = 5.0V, REXT = 24.9kΩ 100 μA Note 3: Parameter not production tested but is guaranteed by design. Note 4: Rise time calculation begins when AVIN > VUVLO and ENABLE = HIGH. Note 5: VOUT Rise Time Accuracy does not include soft-start capacitor tolerance.

©Enpirion 2012 all rights reserved, E&OE Enpirion Confidential www.enpirion.com, Page 7 Typical Performance Curves 100 0123456789 1 0 1 1 1 2 1 3 1 4 1 5 EFFICIENCY (%) OUTPUT CURRENT (A) Efficiency vs. Output Current VOUT = 3.3V VOUT = 1.8V VOUT = 1.2V CONDITIONS VIN = 12.0V AVIN = 3.3V Dual Supply 100 0123456789 1 0 1 1 1 2 1 3 1 4 1 5 EFFICIENCY (%) OUTPUT CURRENT (A) Efficiency vs. Output Current VOUT = 3.3V VOUT = 1.8V VOUT = 1.2V CONDITIONS VIN = 10.0V AVIN = 3.3V Dual Supply 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 25 30 35 40 45 50 55 60 65 70 75 80 85 MAXIMUM OUTPUT CURRENT (A) AMBIENT TEMPERATURE ( C) Output Current De-rating VOUT = 1.2V VOUT = 1.8V VOUT = 3.3V CONDITIONS VIN = 12V TJMAX = 125 C θJA = 13 C/W 13x12x3mm QFN No Air Flow 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 25 30 35 40 45 50 55 60 65 70 75 80 85 MAXIMUM OUTPUT CURRENT (A) AMBIENT TEMPERATURE ( C) Output Current De-rating VOUT = 1.2V VOUT = 1.8V Series1 CONDITIONS VIN = 10V TJMAX = 125 C θJA = 13 C/W 13x12x3mm QFN No Air Flow 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 25 30 35 40 45 50 55 60 65 70 75 80 85 MAXIMUM OUTPUT CURRENT (A) AMBIENT TEMPERATURE ( C) Output Current De-rating with Air Flow (200fpm) VOUT = 1.2V VOUT = 1.8V VOUT = 3.3V CONDITIONS VIN = 12V TJMAX = 125 C θJA = 10.5 C/W 13x12x3mm QFN Air Flow (200fpm) 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 25 30 35 40 45 50 55 60 65 70 75 80 85 MAXIMUM OUTPUT CURRENT (A) AMBIENT TEMPERATURE ( C) Output Current De-rating with Air Flow (400fpm) VOUT = 1.2V VOUT = 1.8V VOUT = 3.3V CONDITIONS VIN = 12V TJMAX = 125 C θJA = 9 C/W 13x12x3mm QFN Air Flow (400fpm)

©Enpirion 2012 all rights reserved, E&OE Enpirion Confidential www.enpirion.com, Page 8 Typical Performance Curves 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 25 30 35 40 45 50 55 60 65 70 75 80 85 MAXIMUM OUTPUT CURRENT (A) AMBIENT TEMPERATURE ( C) Output Current De-rating with Heat Sink VOUT = 1.2V VOUT = 1.8V VOUT = 3.3V CONDITIONS VIN = 12V TJMAX = 125 C θJA = 12 C/W 13x12x3mm QFN No Air Flow Heat Sink ‐Wakefield Thermal Solutions P/N 651‐B 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 25 30 35 40 45 50 55 60 65 70 75 80 85 MAXIMUM OUTPUT CURRENT (A) AMBIENT TEMPERATURE ( C) Output Current De-rating with Heat Sink and Air Flow (200fpm) VOUT = 1.2V VOUT = 1.8V VOUT = 3.3V CONDITIONS VIN = 12V TJMAX = 125 C θJA = 9.5 C/W 13x12x3mm QFN Air Flow (200fpm) Heat Sink - Wakefield Thermal Solutions P/N 651-B 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 25 30 35 40 45 50 55 60 65 70 75 80 85 MAXIMUM OUTPUT CURRENT (A) AMBIENT TEMPERATURE ( C) Output Current De-rating with Heat Sink and Air Flow (400fpm) VOUT = 1.2V VOUT = 1.8V VOUT = 3.3V CONDITIONS VIN = 12V TJMAX = 125 C θJA = 8 C/W 13x12x3mm QFN Air Flow (400fpm) Heat Sink - Wakefield Thermal Solutions P/N 651-B 0.995 0.996 0.997 0.998 0.999 1.000 1.001 1.002 1.003 1.004 1.005 0123456789 1 0 1 1 1 2 1 3 1 4 1 5 OUTPUT VOLTAGE (V) OUTPUT CURRENT (A) Output Voltage vs. Output Current VIN = 8V VIN = 10V VIN = 12V CONDITIONS VIN = 5.0V CONDITIONS VOUT_NOM = 1.0V 1.195 1.196 1.197 1.198 1.199 1.200 1.201 1.202 1.203 1.204 1.205 0123456789 1 0 1 1 1 2 1 3 1 4 1 5 OUTPUT VOLTAGE (V) OUTPUT CURRENT (A) Output Voltage vs. Output Current VIN = 8V VIN = 10V VIN = 12V CONDITIONS VIN = 5.0V CONDITIONS VOUT_NOM = 1.2V 1.795 1.796 1.797 1.798 1.799 1.800 1.801 1.802 1.803 1.804 1.805 0123456789 1 0 1 1 1 2 1 3 1 4 1 5 OUTPUT VOLT AGE (V) OUTPUT CURRENT (A) Output Voltage vs. Output Current VIN = 8V VIN = 10V VIN = 12V CONDITIONS VOUT_NOM = 1.8V Note: Air flow or heat sink may be required for higher currents. See derating curves.

©Enpirion 2012 all rights reserved, E&OE Enpirion Confidential www.enpirion.com, Page 9 Typical Performance Curves 2.495 2.496 2.497 2.498 2.499 2.500 2.501 2.502 2.503 2.504 2.505 0123456789 1 0 1 1 1 2 1 3 1 4 1 5 OUTPUT VOLTAGE (V) OUTPUT CURRENT (A) Output Voltage vs. Output Current VIN = 8V VIN = 10V VIN = 12V CONDITIONS VOUT_NOM = 2.5V Note: Air flow or heat sink may be required for higher currents. See derating curves. 1.196 1.197 1.198 1.199 1.200 1.201 1.202 1.203 1.204 -40 -15 10 35 60 85 OUTPUT VOLTAGE (V) AMBIENT TEMPERATURE ( C) Output Voltage vs. Temperature LOAD = 0A LOAD = 4A LOAD = 8A LOAD = 12A CONDITIONS VIN = 8V VOUT_NOM = 1.2V 1.196 1.197 1.198 1.199 1.200 1.201 1.202 1.203 1.204 -40 -15 10 35 60 85 OUTPUT VOLTAGE (V) AMBIENT TEMPERATURE ( C) Output Voltage vs. Temperature LOAD = 0A LOAD = 4A LOAD = 8A LOAD = 12A CONDITIONS VIN = 10V VOUT_NOM = 1.2V 1.196 1.197 1.198 1.199 1.200 1.201 1.202 1.203 1.204 -40 -15 10 35 60 85 OUTPUT VOLTAGE (V) AMBIENT TEMPERATURE ( C) Output Voltage vs. Temperature LOAD = 0A LOAD = 4A LOAD = 8A LOAD = 12A CONDITIONS VIN = 12V VOUT_NOM = 1.2V 1.196 1.197 1.198 1.199 1.200 1.201 1.202 1.203 1.204 -40 -15 10 35 60 85 OUTPUT VOLTAGE (V) AMBIENT TEMPERATURE ( C) Output Voltage vs. Temperature LOAD = 0A LOAD = 4A LOAD = 8A LOAD = 12A CONDITIONS VIN = 14V VOUT_NOM = 1.2V 2.5 7.5 12.5 17.5 0 5 10 15 20 25 30 INDIVIDUAL OUTPUT CURRENT (A) TOTAL OUTPUT CURRENT (A) Parallel Current Share Breakdown MASTER SLAVE IDEAL CONDITIONS EN23F0QI VIN = 12V VOUT = 1.2V

©Enpirion 2012 all rights reserved, E&OE Enpirion Confidential www.enpirion.com, Page 10 Typical Performance Characteristics ENABLE Enable Startup/Shutdown Waveform (0A) CONDITIONS VIN = 12V, VOUT = 3.3V, Load = 0A, Css = 47nF CIN = 3x22µF(1206), COUT = 3x47µF(0805)+3x22µF(0805) VOUT POK LOAD ENABLE Enable Startup/Shutdown Waveform (5A) CONDITIONS VIN = 12V, VOUT = 3.3V, Load = 5A, Css = 47nF CIN = 3x22µF(1206), COUT = 3x47µF(0805)+3x22µF(0805) VOUT POK LOAD ENABLE Enable Startup/Shutdown Waveform (10A) CONDITIONS VIN = 12V, VOUT = 3.3V, Load = 10A, Css = 47nF CIN = 3x22µF(1206), COUT = 3x47µF(0805)+3x22µF(0805) VOUT POK LOAD ENABLE Enable Startup/Shutdown Waveform (15A) CONDITIONS VIN = 12V, VOUT = 3.3V, Load = 15A, Css = 47nF CIN = 3x22µF(1206), COUT = 3x47µF(0805)+3x22µF(0805) VOUT POK LOAD PVIN Power Up Waveform (0A) CONDITIONS VIN = 12V, VOUT = 3.3V, Load = 0A, Css = 47nF, CIN = 3x22µF(1206), COUT = 3x47µF(0805) + 3x22µF(0805) VOUT POK LOAD PVIN Power Up Waveform (5A) CONDITIONS VIN = 12V, VOUT = 3.3V, Load = 5A, Css = 47nF, CIN = 3x22µF(1206), COUT = 3x47µF(0805) + 3x22µF(0805) VOUT POK LOAD

©Enpirion 2012 all rights reserved, E&OE Enpirion Confidential www.enpirion.com, Page 11 Typical Performance Characteristics PVIN Power Up Waveform (15A) CONDITIONS VIN = 12V, VOUT = 3.3V, Load = 15A, Css = 47nF, CIN = 3x22µF(1206), COUT = 3x47µF(0805) + 3x22µF(0805) VOUT POK LOAD VOUT = 1V (AC Coupled) Output Ripple at 20MHz Bandwidth CONDITIONS VIN = 12V, CIN = 3x22µF (1206), COUT = 3x47µF + 100µF (1206) VOUT = 1.8V (AC Coupled) VOUT = 3.3V (AC Coupled) LOAD = 0A 20mV / DIV VOUT = 1V (AC Coupled) Output Ripple at 20MHz Bandwidth CONDITIONS VIN = 12V, CIN = 3x22µF (1206), COUT = 3x47µF + 100µF (1206) VOUT = 1.8V (AC Coupled) VOUT = 3.3V (AC Coupled) LOAD = 10A 20mV / DIV VOUT = 1V (AC Coupled) Output Ripple at 500MHz Bandwidth CONDITIONS VIN = 12V, CIN = 3x22µF (1206), COUT = 3x47µF + 100µF (1206) VOUT = 1.8V (AC Coupled) VOUT = 3.3V (AC Coupled) LOAD = 0A 20mV / DIV VOUT = 1V (AC Coupled) Output Ripple at 500MHz Bandwidth CONDITIONS VIN = 12V, CIN = 3x22µF (1206), COUT = 3x47µF + 100µF (1206) VOUT = 1.8V (AC Coupled) VOUT = 3.3V (AC Coupled) LOAD = 2A 20mV / DIV VOUT = 1V (AC Coupled) Output Ripple at 500MHz Bandwidth CONDITIONS VIN = 12V, CIN = 3x22µF (1206), COUT = 3x47µF + 100µF (1206) VOUT = 1.8V (AC Coupled) VOUT = 3.3V (AC Coupled) LOAD = 6A 20mV / DIV

©Enpirion 2012 all rights reserved, E&OE Enpirion Confidential www.enpirion.com, Page 12 Typical Performance Characteristics VOUT = 1V (AC Coupled) Output Ripple at 500MHz Bandwidth CONDITIONS VIN = 12V, CIN = 3x22µF (1206), COUT = 3x47µF + 100µF (1206) VOUT = 1.8V (AC Coupled) VOUT = 3.3V (AC Coupled) LOAD = 10A 20mV / DIV VOUT (AC Coupled) Load Transient from 0 to 5A (VOUT =1V) CONDITIONS VIN = 12V, VOUT = 1.0V CIN = 3 x 22µF (1206) COUT = 3 x 47µF (0805) + 3 x 22µF (0805) Using Best Performance Configuration LOAD VOUT (AC Coupled) Load Transient from 0 to 10A (VOUT =1V) CONDITIONS VIN = 12V, VOUT = 1.0V CIN = 3 x 22µF (1206) COUT = 3 x 47µF (0805) + 3 x 22µF (0805) Using Best Performance Configuration LOAD VOUT (AC Coupled) Load Transient from 0 to 15A (VOUT =1V) CONDITIONS VIN = 12V, VOUT = 1.0V CIN = 3 x 22µF (1206) COUT = 3 x 47µF (0805) + 3 x 22µF (0805) Using Best Performance Configuration LOAD VOUT (AC Coupled) Load Transient from 0 to 5A (VOUT =3.3V) CONDITIONS VIN = 12V, VOUT = 3.3V CIN = 3 x 22µF (1206) COUT = 3 x 47µF (0805) + 3 x 22µF (0805) Using Best Performance Configuration LOAD VOUT (AC Coupled) Load Transient from 0 to 10A (VOUT =3.3V) CONDITIONS VIN = 12V, VOUT = 3.3V CIN = 3 x 22µF (1206) COUT = 3 x 47µF (0805) + 3 x 22µF (0805) Using Best Performance Configuration LOAD

©Enpirion 2012 all rights reserved, E&OE Enpirion Confidential www.enpirion.com, Page 13 Typical Performance Characteristics VOUT (AC Coupled) Load Transient from 0 to 15A (VOUT =3.3V) CONDITIONS VIN = 12V, VOUT = 3.3V CIN = 3 x 22µF (1206) COUT = 3 x 47µF (0805) + 3 x 22µF (0805) Using Best Performance Configuration LOAD VOUT (AC Coupled) Load Transient from 0 to 5A (VOUT =3.3V) CONDITIONS VIN = 12V, VOUT = 3.3V CIN = 3 x 22µF (1206) COUT = 3 x 47µF (1206) + 100µF (1206) Using Best Performance Configuration LOAD VOUT (AC Coupled) Load Transient from 0 to 10A (VOUT =3.3V) CONDITIONS VIN = 12V, VOUT = 3.3V CIN = 3 x 22µF (1206) COUT = 3 x 47µF (1206) + 100µF (1206) Using Best Performance Configuration LOAD VOUT (AC Coupled) Load Transient from 0 to 15A (VOUT =3.3V) CONDITIONS VIN = 12V, VOUT = 3.3V CIN = 3 x 22µF (1206) COUT = 3 x 47µF (1206) + 100µF (1206) Using Best Performance Configuration LOAD

©Enpirion 2012 all rights reserved, E&OE Enpirion Confidential www.enpirion.com, Page 14 Functional Block Diagram Soft Start Power Good Logic Band Gap Reference Voltage Reference Generator Compensation Network Thermal Limit UVLO Current Limit Gate Drive PLL/Sawtooth GeneratorFADJ ENABLE SS AGND POK AVIN VFB PGND VOUT NC(SW) PVINS_IN Error Amp PWM Comp (+) (-) (-) (+) Digital I/O S_OUT To PLL Linear Regulator AVINO 300k 180k M/S Compensation Network EAIN PGBTMP BGND VDDB Figure 4: Functional Block Diagram Functional Description Synchronous Buck Converter The EN23F0QI is a highly integrated synchronous, buck converter with integrated controller, power MOSFET switches and integrated inductor. The nominal input voltage (PVIN) range is 4.5V to 14V and can support up to 15A of continuous output current. The output voltage is programmed using an external resistor divider network. The control loop utilizes a Type IV Voltage-Mode compensation network and maximizes on a low-noise PWM topology. Much of the compensation circuitry is internal to the device. However, a phase lead capacitor is required along with the output voltage feedback resistor divider to complete the Type IV compensation network.. The high switching frequency of the EN23F0QI enables the use of small size input and output capacitors, as well as a wide loop bandwidth within a small foot print. Protection Features: The power supply has the following protection features:

Programmable Over-Current Protection
Thermal Shutdown with Hysteresis
Under-Voltage Lockout Protection Additional Features:
Switching Frequency Synchronization
Programmable Soft-Start
Power OK Output Monitoring Power Up Sequence The EN23F0QI is designed to be powered by either a single input supply (PVIN) or two separate

Figure 7. RFS versus Switching Frequency performance of the EN23F0QI. 78) and the AGND pin (pin 74). persists, the circuit will continue to protect the load.

Figure 9. Parallel Operation Illustration

Application Information

Output Voltage Programming and Loop Compensation The EN23F0QI uses a Type IV Voltage Mode compensation network. Type IV Voltage Mode control is a proprietary Enpirion control scheme that maximizes control loop bandwidth to deliver excellent load transient responses and maintain output regulation with pin point accuracy. For ease of use, most of this network has been customized and is integrated within the device package. The EN23F0QI output voltage is programmed using a simple resistor divider network (R A and R B). The feedback voltage at VFB is nominally 0.6V. R A is predetermined based on Table 5 and R B can be calculated based on Figure 10. The values recommended for C OUT, CA, RCA and R EA make up the external compensation of the EN23F0QI. It will vary with each PVIN and VOUT combination to optimize on performance. The EN23F0QI solution can be optimized for either smallest size or highest performance. Please see Table 5 for a list of recommended R A, CA, RCA, REA and COUT values for each solution. Figure 10: VOUT Resistor Divider & Compensation Components. See Table 5 for details. Input Capacitor Selection The EN23F0QI requires three 22µF/1206 input capacitor. Low-cost, low-ESR ceramic capacitors should be used as input capacitors for this converter. The dielectric must be X5R or X7R rated. Y5V or equivalent dielectric formulations must not be used as these lose too much capacitance with frequency, temperature and bias voltage. In some applications, lower value capacitors are needed in parallel with the larger, capacitors in order to provide high frequency decoupling. Table 3 contains a list of recommended input capacitors. Recommended Input Capacitors Description MFG P/N 22µF, 16V, X5R, 10%, 1206 Murata GRM31CR61C226ME15 22µF, 16V, X5R, 20%, 1206 Taiyo Yuden EMK316ABJ226ML-T 22µF, 25V, X5R, 10%, 1210 Murata GRM32ER61E226KE15L 22µF, 25V, X5R, 20%, 1210 Taiyo Yuden TMK325BJ226MM-T Table 3: Recommended Input Capacitors Output Capacitor Selection As seen from Table 5, the EN23F0QI has been optimized for use with three 47µF/1206 plus one 100µF/1206 for best performance. For smallest solution size, various combinations of output capacitance may be used. See Table 5 for details. Low ESR ceramic capacitors are required with X5R or X7R rated dielectric formulation. Y5V or equivalent dielectric formulations must not be used as these lose too much capacitance with frequency, temperature and bias voltage. Table 4 contains a list of recommended output capacitors. Output ripple voltage is determined by the aggregate output capacitor impedance. Capacitor impedance, denoted as Z, is comprised of capacitive reactance, effective series resistance, ESR, and effective series inductance, ESL reactance. Placing output capacitors in parallel reduces the impedance and will hence result in lower ripple voltage. nTotal ZZZZ 1...111 +++= Recommended Output Capacitors Description MFG P/N 47µF, 6.3V, X5R, 20%, 1206 Murata GRM31CR60J476ME19L 47µF, 10V, X5R, 20%, 1206 Taiyo Yuden LMK316BJ476ML-T 22µF, 10V, X5R, 20%, 0805 Panasonic ECJ-2FB1A226M 22µF, 10V, X5R, 20%, 0805 Taiyo Yuden LMK212BJ226MG-T 100µF, 6.3V, X5R, 20%, 1206 Murata GRM31CR60J107ME39L Taiyo Yuden JMK316BJ107ML-T Table 4: Recommended Output Capacitors

©Enpirion 2012 all rights reserved, E&OE Enpirion Confidential www.enpirion.com, Page 20 Best Performance Smallest Solution Size CIN = 3 x 22µF/1206 CIN = 3 x 22µF/1206 COUT = 3x47µF (1206) + 100µF(1206) VOUT ≤ 1.8V, COUT = 22µF/0805 + 2x47µF/0805 3.3V > VOUT> 1.8V, COUT = 3x47µF/1206 RA = 200 kΩ RA = 100 kΩ PVIN (V) VOUT (V) CA (pF) RCA (kΩ) REA (kΩ) Ripple (mV) Deviation (mV) PVIN (V) VOUT (V) CA (pF) RCA (kΩ) REA (kΩ) Ripple (mV) Deviation (mV) 14V 1.0V 15 19 0 25.6 23 14V 1.0V 12 36 Open 15 78 1.2V 12 22 0 24 35 1.2V 12 36 Open 18 93 1.5V 12 22 0 26.4 42 1.5V 12 36 Open 22 104 1.8V 10 24 0 28.4 45 1.8V 12 36 Open 25 130 2.5V 18 14 56 31.6 78 2.5V 15 27 Open 32 162 3.3V 12 14 56 37.3 114 3.3V 10 27 Open 46 200 12V 1.0V 18 16 0 21.6 31 12V 1.0V 22 27 Open 15 84 1.2V 15 19 0 22.7 38 1.2V 22 27 Open 18 97 1.5V 15 19 0 25.2 39 1.5V 18 27 Open 21 118 1.8V 12 22 0 25.8 41 1.8V 18 27 Open 24 130 2.5V 22 12 56 30 84 2.5V 22 27 Open 30 172 3.3V 15 12 56 30.8 116 3.3V 15 27 Open 43 213 10V 1.0V 18 14 0 18.8 37 10V 1.0V 56 20 Open 15 85 1.2V 18 14 0 20.4 41 1.2V 47 20 Open 17 100 1.5V 18 16 0 22 42 1.5V 39 20 Open 20 120 1.8V 15 19 0 23.6 46 1.8V 33 20 Open 22 140 2.5V 27 10 56 26.5 90 2.5V 33 20 Open 29 177 3.3V 22 10 56 28.9 122 3.3V 22 20 Open 41 230 1.0V 22 10 0 17.2 17.2 1.0V 200 10 Open 14 83 1.2V 22 13 0 18.7 18.7 1.2V 200 10 Open 16 90 1.5V 18 15 0 20.1 20.1 1.5V 150 10 Open 19 107 1.8V 18 15 0 20.9 20.9 1.8V 82 10 Open 20 138 2.5V 39 6 56 23.6 23.6 2.5V 68 10 Open 27 178 3.3V 27 6 56 22.8 22.8 3.3V 39 10 Open 36 239 6.6V 1.0V 27 10 0 13.8 13.8 6.6V 1.0V 200 10 Open 13 99 1.2V 27 10 0 15.2 15.2 1.2V 200 10 Open 15 105 1.5V 22 13 0 16.4 16.4 1.5V 200 10 Open 17 118 1.8V 22 13 0 19.6 19.6 1.8V 150 10 Open 19 138 2.5V 47 4 56 20.4 20.4 2.5V 100 10 Open 24 183 3.3V 39 4 56 21.1 21.1 3.3V 56 10 Open 32 250 1.0V 33 10 0 12.4 12.4 1.0V 200 10 Open 12 123 1.2V 33 10 0 13.4 13.4 1.2V 200 10 Open 13 132 1.5V 27 13 0 14.3 14.3 1.5V 200 10 Open 16 145 1.8V 27 13 0 15.4 15.4 1.8V 200 10 Open 17 156 2.5V 68 1 56 15.5 15.5 2.5V 100 10 Open 20 216 3.3V 47 1 56 12.9 12.9 3.3V 100 10 Open 21 253 Table 5: RA, CA, RCA and REA Values for Various PVIN/VOUT Combinations: Best Performance vs. Smallest Solution Size. Use the equations in Figure 10 to calculate RB. Note 6: Output ripple is measured at no load and nominal deviation is for a 15A load transient step. Note 7: For compensation values of output voltage in between the specified output voltages, choose compensation values of the lower output voltage setting.

©Enpirion 2012 all rights reserved, E&OE Enpirion Confidential www.enpirion.com, Page 21 Thermal Considerations Thermal considerations are important power supply design facts that cannot be avoided in the real world. Whenever there are power losses in a system, the heat that is generated by the power dissipation needs to be accounted for. The Enpirion PowerSoC helps alleviate some of those concerns. The Enpirion EN23F0QI DC-DC converter is packaged in an 8x11x3mm 68-pin QFN package. The QFN package is constructed with copper lead frames that have exposed thermal pads. The exposed thermal pad on the package should be soldered directly on to a copper ground pad on the printed circuit board (PCB) to act as a heat sink. The recommended maximum junction temperature for continuous operation is 125°C. Continuous operation above 125°C may reduce long-term reliability. The device has a thermal overload protection circuit designed to turn off the device at an approximate junction temperature value of 150°C. The EN23F0QI is guaranteed to support the full 4A output current up to 85°C ambient temperature. The following example and calculations illustrate the thermal performance of the EN23F0QI. Example: V IN = 12V VOUT = 1.2V IOUT = 15A First calculate the output power. P OUT = 1.2V x 15A = 18W Next, determine the input power based on the efficiency (η) shown in Figure 11. Figure 11: Efficiency vs. Output Current For VIN = 12V, VOUT = 1.2V at 15A, η ≈ 80% η = POUT / PIN = 80% = 0.8 PIN = POUT / η PIN ≈ 18W / 0.8 ≈ 22.5W The power dissipation (P D) is the power loss in the system and can be calculated by subtracting the output power from the input power. P D = PIN – POUT ≈ 22.5W – 18W ≈ 4.5W With the power dissipation known, the temperature rise in the device may be estimated based on the theta JA value ( θ JA). The θJA parameter estimates how much the temperature will rise in the device for every watt of power dissipation. The EN23F0QI has a θ JA value of 13 ºC/W without airflow. Determine the change in temperature ( ΔT) based on PD and θJA. ΔT = PD x θJA The junction temperature (T J) of the device is approximately the ambient temperature (T A) plus the change in temperature. We assume the initial ambient temperature to be 25°C. T J = TA + ΔT The maximum operating junction temperature (TJMAX) of the device is 125°C, so the device can operate at a higher ambient temperature. The maximum ambient temperature (T AMAX) allowed can be calculated. TAMAX = TJMAX – PD x θJA The maximum ambient temperature the device can reach is 66°C given the input and output conditions. Note that the efficiency will be slightly lower at higher temperatures and this calculation is an estimate. 100 0123456789 1 0 1 1 1 2 1 3 1 4 1 5 EFFICIENCY (%) OUTPUT CURRENT (A) Efficiency vs. Output Current VOUT = 3.3V VOUT = 1.8V VOUT = 1.2V CONDITIONS VIN = 12.0V AVIN = 3.3V Dual Supply

©Enpirion 2012 all rights reserved, E&OE Enpirion Confidential www.enpirion.com, Page 24 Design Considerations for Lead-Frame Based Modules Exposed Metal on Bottom of Package Lead-frames offer many advantages in thermal performance, in reduced electrical lead resistance, and in overall foot print. However, they do require some special considerations. In the assembly process lead frame construction requires that, for mechanical support, some of the lead-frame cantilevers be exposed at the point where wire-bond or internal passives are attached. This results in several small pads being exposed on the bottom of the package, as shown in Figure 14. Only the thermal pad and the perimeter pads are to be mec hanically or electrically connected to the PC board. The PCB top layer under the EN23F0QI should be clear of any metal (copper pours, traces, or vias) except for the thermal pad. The “shaded-out” area in Figure 14 represents the area that should be clear of any metal on the top layer of the PCB. Any layer 1 metal under the shaded-out area runs the risk of undesirable shorted connections even if it is covered by soldermask. The solder stencil aperture should be smaller than the PC B ground pad. This will prevent excess solder from causing bridging between adjacent pins or other exposed metal under the package. Please consult the Enpirion Manufacturing Application Note for more details and recommendations. Figure 14: Lead-Frame exposed metal (Bottom View) Shaded area highlights exposed metal that is not to be mechanically or electrically connected to the PCB.

©Enpirion 2012 all rights reserved, E&OE Enpirion Confidential www.enpirion.com, Page 26 Package and Mechanical Figure 16: EN23F0QI Package Dimensions (Bottom View) Packing and Marking Information: http://www.enpirion.com/resource-center-packing-and-marking-information.htm Contact Information Enpirion, Inc. Perryville III Corporate Park

53 Frontage Road - Suite 210

Hampton, NJ 08827 USA 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

Product Information

ECJ-2FB1A226M specifications and overview.

Summary

15A Voltage Mode Synchronous Buck PWM

Description

15A Voltage Mode Synchronous Buck PWM

Source title ECJ-2FB1A226M Datasheet(PDF) - Enpirion, Inc.

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