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EN5366QI
6A Voltage Mode Synchronous Buck PWM DC-DC Converter with Integrated Inductor External Output Voltage Programming
RoHS Compliant Halogen Free
Description
This Enpirion solution is a Power System on a chip (PowerSoC). It is specifically designed to meet the precise voltage and fast transient requirements of present and future highperformance, low-power processor, DSP, FPGA, ASIC, memory boards and system level applications in a distributed power architecture. Advanced circuit techniques, ultra high switching frequency, and very advanced, high-density, integrated circuit and proprietary inductor technology deliver high-quality, ultra compact, non-isolated DC-DC conversion. Operating this converter requires as few as three external components that include small value input and output ceramic capacitors and a soft-start capacitor. The Enpirion integrated inductor solution significantly helps in low noise system design and productivity by offering greatly simplified board design, layout and manufacturing requirements. All Enpirion products are RoHS compliant and lead-free manufacturing environment compatible.
Features
* * * * * * * * * * * * * * * Integrated INDUCTOR, MOSFETS, Controller Footprint 1/3rd that of competing solutions. Low Part Count: only 3 MLCC Capacitors. Up to 20W continuous output power. Low output impedance optimized for 90 nm Master/slave configuration for paralleling. 5MHz operating frequency. High efficiency, up to 93%. Wide input voltage range of 2.375V to 5.5V. External resistor divider output voltage select. Output enable pin and Power OK signal. Programmable soft-start time. Optimized for low noise/EMI design. Under-Voltage Lockout, Thermal Shutdown, Output Overvoltage, Over Current, and Short Circuit Protection RoHS compliant, MSL level 3, 260C reflow.
Applications
* * * * * Point of load regulation for low-power processors, network processors, DSPs, FPGAs, and ASICs 90 nm advanced process loads Notebook computers, servers, workstations Broadband, networking, LAN/WAN, optical Low voltage, distributed power architectures with 2.5V, 3.3V or 5V rails DSL, STB, DVR, DTV, Industrial PC Ripple sensitive applications
Typical Application Circuit
VIN 47F 1
PVIN AVIN ENABLE PGND SS XOV XFB VOUT
VOUT 47F
* *
15nF
AGND PGND
Ordering Information
Part Number EN5366QI EN5366QI-E Temp Rating Package (C) -40 to +85 58-pin QFN T&R QFN Evaluation Board
Figure 1. Simple Layout.
*Optimized PCB Layout file downloadable from the Enpirion Website to assure first pass design success.
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EN5366QI
Pin Configuration
Below is a top view diagram of the EN5366Q package. NOTE: 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.
Figure 2. Pin Diagram, top view.
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EN5366QI
Pin Descriptions
PIN
1-3
NAME
NC
FUNCTION
NO CONNECT: These pins should not be electrically connected to each other or to any external signal, voltage, or ground. One or more of these pins may be connected internally. NO CONNECT - These pins are internally connected to the common drain output 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. NO CONNECT: These pins should not be electrically connected to each other or to any external signal, voltage, or ground. One or more of these pins may be connected internally. Regulated converter output. Decouple with output filter capacitor to PGND. Refer to layout section for specific layout requirements NO CONNECT - These pins are internally connected to the common drain output 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. NO CONNECT: These pins should not be electrically connected to each other or to any external signal, voltage, or ground. One or more of these pins may be connected internally. Output power ground. Refer to layout section for specific layout requirements. Input power supply. Connect to input power supply. Decouple with input capacitor to PGND. Refer to layout section for specific layout requirements NO CONNECT: These pins should not be electrically connected to each other or to any external signal, voltage, or ground. One or more of these pins may be connected internally. Optional Over Current Protection adjust pin. Used for diagnostic purposes only. Place 10k resistor between this pin and AGND (pin 40) to raise the over current trip point to approximately 200% of maximum rated current. Analog voltage input for the controller circuits. Connect this pin to PVIN using a 1 Ohm resistor. Analog ground for the controller circuits. NO CONNECT: These pins should not be electrically connected to each other or to any external signal, voltage, or ground. One or more of these pins may be connected internally. Feedback pin for external voltage divider network. Over voltage programming feedback pin. NO CONNECT: This pin should not be electrically connected to any other NC pin, or to any external signal, voltage, or ground. This pin may be connected internally. Power OK is an open drain transistor for power system state indication. POK is a logic high when VOUT is with -10% to +20% of VOUT nominal. Size pull-up resistor to limit current to 4mA when POK is low. NO CONNECT: These pins should not be electrically connected to each other or to any external signal, voltage, or ground. One or more of these pins may be connected internally. Soft-Start node. The soft-start capacitor is connected between this pin and AGND. The value of this capacitor determines the startup timing. Optional Error Amplifier input. Allows for customization of the control loop. Optional Error Amplifier output. Allows for customization of the control loop. Optional Error Amplifier Buffer output. Allows for customization of the control loop.
4-5
NC(SW)
6-13 14-20 21-22
NC VOUT NC(SW)
23 24-29 30-35 36-37
NC PGND PVIN NC
38 39 40 41-42 43 44 45 46 47 48 49 50 51
ROCP AVIN AGND NC XFB XOV NC POK NC SS EAIN EAOUT COMP
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EN5366QI PIN
52
NAME
ENABLE
FUNCTION
Input Enable. Applying a logic high, enables the output and initiates a soft-start. Applying a logic low disables the output. PWM input/output. Used for optional master/slave configuration. When M/S pin is asserted "low", PWM will output the gate-drive PWM waveform. When the M/S pin is asserted "high", the PWM pin is configured as an input for PWM signal from the "master" device. PWM pin can drive up to 3 slave devices. NOTE: Leave this pin open when not using parallel mode. NO CONNECT: These pins should not be electrically connected to each other or to any external signal, voltage, or ground. One or more of these pins may be connected internally. Optional Master/Slave select pin. Asserting pin "low" places device in Master Mode for current sharing. PWM pin (53) will output PWM drive signal. Asserting pin "high" will place the device in Slave Mode. PWM pin (53) will be configured to input (receive) PWM drive signal from "Master" device. NOTE: Leave this pin open when not using parallel mode. NO CONNECT: These pins should not be electrically connected to each other or to any external signal, voltage, or ground. One or more of these pins may be connected internally.
53
PWM
54
NC
55
M/S
56-58
NC
Block Diagram
POK PVIN
UVLO Thermal Limit ROCP Current Limit
power Good Logic
Over Voltage
VOUT
XOV
Over Voltage P-Drive
NC(SW)
VOUT (-) PWM Comp (+) N-Drive PGND
Sawtooth Generator
Compensation Network Voltage Selector
(-) Error Amp ENABLE (+)
XFB
SS
Soft Start
Reference Voltage selector
Bandgap Reference
EAOUT
EAIN
COMP
Figure 3. System block diagram.
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EN5366QI
Absolute Maximum Ratings
CAUTION: Absolute Maximum ratings are stress ratings only. Functional operation beyond recommended operating conditions is not implied. Stress beyond absolute maximum ratings may cause permanent damage to the device. Exposure to absolute maximum rated conditions for extended periods may affect device reliability. PARAMETER
Input Supply Voltage Voltages on: ENABLE, Voltage on XFB, XOV Voltages on: EAIN, EAOUT, COMP Voltages on: SS, PWM Voltages on: POK Storage Temperature Range Reflow Temp, 10 Sec, MSL3 JEDEC J-STD-020A ESD Rating (based on Human Body Model)
SYMBOL
VIN
MIN
-0.5 -0.5 -0.5 -0.5 -0.5 -0.5 -65
MAX
7.0 VIN 2.5 2.5 3.0 VIN + 0.3 150 260 2000
UNITS
V V V V V V C C V
TSTG
Recommended Operating Conditions
PARAMETER
Input Voltage Range Output Voltage Range Operating Ambient Temperature Operating Junction Temperature
SYMBOL
VIN VOUT TA TJ
MIN
2.375 0.75 -40 -40
MAX
5.5 3.3 +85 +125
UNITS
V V C C
Thermal Characteristics
PARAMETER
Thermal Resistance: Junction to Ambient (0 LFM) (Note 1) Thermal Resistance: Junction to Case (0 LFM) Thermal Overload Trip Point Thermal Overload Trip Point Hysteresis
SYMBOL
JA JC TJ-TP
TYP
20 1.5 +150 20
UNITS
C/W C/W C C
NOTES:
1. Based on a four-layer board and proper thermal design in line with JEDEC EIJ/JESD 51 Standards.
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EN5366QI
Electrical Characteristics
NOTE: VIN=5.5V over operating temperature range unless otherwise noted. Typical values are at TA = 25C. PARAMETER
Input Voltage Output Regulation
Feedback Pin Voltage Feedback Pin Voltage
SYMBOL
VIN VOUT VOUT
TEST CONDITIONS
2.375V VIN 5.5V, ILOAD = 1A; TA = 25C 2.375V VIN 5.5V, 0A ILOAD 6A -40 C TA +85 C
MIN
2.375 0.735 0.725
TYP
MAX
5.5
UNITS
V V V
0.750 0.750
0.765 0.773
Transient Response (IOUT = 0% to 100% or 100% to 0% of Rated Load) VIN = 5V, 1.2V < VOUT < 3.3V Peak Deviation VOUT COUT=50uF Under Voltage Lockout Under Voltage Lock VIN Increasing VUVLO out threshold VIN Decreasing Switching Frequency Switching FSWITCH Frequency Load Characteristics Maximum IOUT Continuous Output (Note 2) Current Current Limit IOCP_TH Threshold Supply Current Shut-Down Supply ENABLE=0V IS Current
Enable Operation
3 2.2 2.1 5
% V MHz
6 9 50 0.8 1.8 50
A A A V V A
Disable Threshold Enable Threshold Enable Pin Current
VDISABLE VENABLE IEN
Max voltage to ensure the converter is disabled 2.375V VIN 5.5V VIN = 5.5V
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EN5366QI PARAMETER
Logic Low Threshold Logic High Threshold VSx Pin Current
SYMBOL
VSX-Low VSX-High
TEST CONDITIONS
Threshold voltage for Logic Low Threshold voltage for Logic High (internally pulled high; can be left floating to achieve logic high) VIN = 5.5V VSx = GND VSx = VIN VSx = Open Percentage of VOUT Nominal Percentage of VOUT Nominal IPOK = 4 mA (Max sink Current)
MIN
TYP
MAX
0.8
UNITS
V V
Voltage Select Operation
1.8 50 0 0 120 90
VIN
IVSX
A
Power OK Operation (Open Drain)
POK threshold High POK threshold low POK Low Voltage POK High Voltage Output Rise Time
0.4 VIN
% % V %
VOUT Rise Time Accuracy
Parallel Operation
TRISE
TRISE = Css* 75K;
10nF CSS 30nF
-25
+25
%
(Note 3)
IOUT With 2 - 4 converters in parallel, the difference between any 2 parts. VIN < 50mV; RTRACE < 10m. +/-10 %
Current Balance
NOTES:
2. Maximum output current may need to be de-rated, based on operating condition, to meet TJ requirements. 3. Parameter not production tested but is guaranteed by design. Rise time begins when AVIN > VUVLO and Enable=HIGH.
Typical Performance Characteristics
95 90 85 80 Efficiency (%) 75 70 65 60 55 50 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 Load Current (A)
95 90
VOUT=3.3V VOUT=2.5V VOUT=1.8V VOUT=1.5V VOUT=1.2V
VOUT=2.5V VOUT=1.8V
Efficiency (%) 85 80 75 70 65 60 55 50 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 Load Current (A)
VOUT=1.5V VOUT=1.2V
VIN=3.3V
VIN=5.0V
Efficiency vs. Load, VIN = 3.3V.; Load = 0-6A.
Efficiency vs. Load, VIN = 5.0V.; Load = 0-6A.
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EN5366QI
Ripple Voltage, 5.0VIN/1.2VOUT, IOUT=6A, COUT = 3x22uF.
Ripple Voltage, 3.3VIN/1.2VOUT, IOUT=6A, COUT = 3x22uF.
Transient Response 5.5VIN/1.2VOUT, 0-6A, 10A/uS. COUT=50uF.
Transient Response 5.5VIN/3.3VOUT, 0-6A, 10A/uS. COUT=50uF
Start up waveforms VIN=5.0V, VOUT=1.2V, CSS=15nF, Ch 1 = VOUT, Ch 3 = ENABLE, Ch 4 = POK.
Start up waveforms VIN=5.0V, VOUT=3.3V, CSS=15nF, Ch 1 = VOUT, Ch 3 = ENABLE, Ch 4 = POK.
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EN5366QI
Theory of Operation
Synchronous Buck Converter
The EN5366 is a synchronous, programmable power supply with integrated power MOSFET switches and integrated inductor. The nominal input voltage range is 2.4-5.5V. The output voltage is programmed using an external resistor divider network. The feedback control loop is a type III voltage-mode and the part uses a lownoise PWM topology. Up to 6A of continuous output current can be drawn from this converter. The 5MHz operating frequency enables the use of small-size input and output capacitors. The power supply has the following protection features: * Programmable over-current protection (to protect the IC from excessive load current). * Short Circuit protection. * Thermal shutdown with hysteresis. * Programmable over-voltage protection. * Under-voltage lockout circuit to disable the converter output when the input voltage is less than approximately 2.2V Additional features include: * * Soft-start circuit, to limit the in-rush current when the converter is powered up. Power good circuit (POK) indicating whether the output voltage is between 90% of nominal VOUT and the OVP trip point. It is recommended that Rb1 and Rb2 resistor values be ~2k. Use the following equation to set the resistor Ra1 for the desired output voltage:
Ra1 = (Vout - 0.75V ) * Rb1 0.75V
If over-voltage protection is desired, use the following equation to set the resistor Ra2 for the desired OVP trip-point:
Ra 2 = (OVPtrip - 0.90V ) * Rb 2 0.90V
By design, if both resistor dividers are the same, the OV trip-point will be 20% above the nominal output voltage.
VIN
47F
AVIN SS
PVIN
POK
VOUT
VOUT Ra2 Rb2 Ra1
47F
XOV XFB
CSS
AGND PGND
Rb1
Figure 4. VOUT and OVP resistor divider networks.
Input Capacitor Selection
The EN5366QI requires about 40-50uF of input capacitance. Low ESR ceramic capacitors are required with X5R or X7R dielectric formulation. Y5V or equivalent dielectric formulations must not be used as they lose capacitance with frequency, temperature and bias voltage. In some applications, lower value ceramic capacitors maybe needed in parallel with the larger capacitors in order to provide high frequency decoupling.
Output Voltage Programming
The EN5366 output voltage is programmed using a simple resistor divider network. Figure 4 shows the resistor divider configuration. The EN5366 output voltage and over voltage thresholds are determined by the voltages presented at the XFB and XOV pins respectively. These voltages are set by way of resistor dividers between VOUT and AGND with the midpoint going to XFB and XOV.
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EN5366QI Recommended Input Capacitors.
Description
22uF, 10V, X5R, 1206 (2 capacitors needed) 47uF, 10V, X5R, 1210 (1 capacitor needed)
Output Ripple vs Capacitor Configuration.
Output Capacitor Configuration 1 x 47uF 3 x 22 uF Typical Output Ripple (mVp-p) (as measured on EN5366QI Evaluation Board) 30 15
MFG
Murata Taiyo Yuden Murata Taiyo Yuden
P/N
GRM31CR61A226ME19L LMK316BJ226ML-T GRM32ER61A476KE20L LMK325BJ476MM-T
Compensation
The EN5366 is internally compensated through the use of a type 3 compensation network and is optimized for use with about 50F of output capacitance and will provide excellent loop bandwidth and transient performance for most applications. Voltage mode operation provides high noise immunity at light load. Further, Voltage mode control provides superior impedance matching to sub 90nm loads. In some cases modifications to the compensation may be required. The EN5366QI provides the capability to modify the control loop to allow for customization for a given application. For more information, contact Enpirion Applications Engineering support.
Output Capacitor Selection
The EN5366QI has been optimized for use with approximately 50F of output capacitance. Low ESR ceramic capacitors are required with X5R or X7R dielectric formulation. Y5V or equivalent dielectric formulations must not be used as these lose capacitance with frequency, temperature and bias voltage. Recommended Output Capacitors.
Description 22uF, 6.3V, 10% X5R, 1206 (3 capacitors needed) 47uF, 10V, 10% X5R, 1210 47uF, 6.3V, 10% X5R, 1210 (1 capacitor needed) MFG Murata Taiyo Yuden Murata AVX P/N GRM31CR60J226KE19L JMK316BJ226KL-T GRM32ER61A476KE20L 12106D476KAT2
Enable Operation
The ENABLE pin provides a means to shut down the device, 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. When the ENABLE pin is asserted high, the device will undergo a normal soft start.
Output ripple voltage is primarily determined by the aggregate output capacitor impedance. At the 5MHz switching frequency output impedance, denoted as Z, is comprised mainly of effective series resistance, ESR, and effective series inductance, ESL: Z = ESR + ESL. Placing output capacitors in parallel reduces the impedance and will hence result in lower ripple voltage.
1 Z Total = 1 1 1 + + ... + Z1 Z 2 Zn
Soft-Start Operation
The SS pin in conjunction with a small capacitor between this pin and AGND provides the soft start function to limit the in-rush current during start-up. During start-up of the converter the reference voltage to the error amplifier is gradually increased to its final level by an internal current source of typically 10uA charging the soft start capacitor. The typical soft-start time for the output to reach regulation voltage, from when AVIN > VUVLO and Enable crosses its logic high threshold, is given by:
Typical ripple versus capacitor arrangement is given below:
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EN5366QI TSS = CSS * 75K (seconds) Where the soft-start time TSS is in seconds and the soft-start capacitance CSS is in Farads. Typically, a capacitor of around 15nF is recommended. During the soft-start cycle, when the soft-start capacitor reaches 0.75V, the output has reached its programmed regulation range. Note that the soft-start current source will continue to operate, and during normal operation, the soft-start capacitor will charge up to a final value of 2.5V. The OCP trip point is nominally set to 150% of maximum rated load. For diagnostic purposes, it is possible to increase the OCP trip point to approximately 200% of the maximum rated load by connecting a 10k resistor between the ROCP pin (pin 38) and AGND (pin 39). This is intended for troubleshooting purposes only and the specification is not guaranteed.
Over-Voltage Protection
When the output voltage exceeds 120% of the programmed output voltage, the PWM operation stops, the lower N-MOSFET is turned on and the POK signal goes low. When the output voltage drops below 95% of the programmed output voltage, normal PWM operation resumes and POK returns to its high state.
POK Operation
The POK signal is an open drain signal from the converter indicating the output voltage is within the specified range. The POK signal will be a logic high when the output voltage is within 90% 120% of the programmed output voltage. If the output voltage goes outside of this range, the POK signal will be a logic low until the output voltage has returned to within this range. In the event of an over-voltage condition the POK signal will go low and will remain in this condition until the output voltage has dropped to 95% of the programmed output voltage before returning to the high state. The internal POK FET is designed to tolerate up to 4mA. The pull-up resistor value should be chosen to limit the current from exceeding this value when POK is logic low.
Thermal Overload Protection
Thermal shutdown will disable operation when the Junction temperature exceeds approximately 150C. Once the junction temperature drops by approx 20C, the converter will re-start with a normal soft-start.
Input Under-Voltage Lock-Out
Circuitry is provided to ensure that when the input voltage is below the required voltage level (VUVLO) for normal operation, the converter will not start-up. Circuits for hysteresis and input deglitch are included to ensure high noise immunity and to prevent false tripping.
Over-Current Protection
The current limit function is achieved by sensing the current flowing through a sense P-MOSFET. When the sensed current exceeds the current limit, both NFET and PFET switches are turned off. If the over-current condition is removed, the over-current protection circuit will re-enable the PWM operation. If the over-current condition persists, the circuit will continue to protect the load.
Parallel Device Operation
The EN5366QI is capable of paralleling up to a total of four converters to provide up to 24A of continuous current. Please refer to the Parallel Operation Application note, available on the Enpirion website www.enpirion.com, for details on parallel operation.
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EN5366QI
Layout Recommendations
Compensation Test Points AGND Test Points
High-Frequency Noise Suppression Vias
Thermal Pad Vias and Soldermask Opening
VOUT(+) Copper Local Ground Copper
VIN(+) Copper Slit separating input local ground from output local ground
Vout
PGND Copper Slit
Vin
Figure 5. Layout of power and ground copper.
Figure 6. Use of thermal & noise suppression vias.
Recommendation 1: Input and output filter capacitors should be placed as close to the EN5366QI package as possible to reduce EMI from input and output loop currents. This reduces the physical area of the Input and Output AC current loops. Recommendation 2: Place a slit in the input/output capacitor ground copper starting just below the common connection point of the device GND pins as shown in figures 5 and 6. Recommendation 3: The large thermal pad underneath the component must be connected to the system ground plane through as many vias as possible. The drill diameter of the vias should be less than 0.33mm, and the vias must have at least 1 oz. copper plating on the inside wall, making the finished hole size around 0.26mm. This connection provides the path for heat dissipation from the converter. Please see figures 6, 7, and 8. Recommendation 4: Multiple small vias should be used to connect ground terminal of the input capacitor and output capacitors to the system ground plane as shown in figure 6.
These vias can be the same size as the thermal vias discussed in recommendation 3. Recommendation 5: The system ground plane referred to in recommendations 3 and 4 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 shown in figure 6. Recommendation 6: As with any switch-mode DC/DC converter, do not run sensitive signal or control lines underneath the converter package. Please refer to the Gerber files and summarized layout notes available on the Enpirion website www.enpirion.com for more layout details. NOTE: Figures 5 and 6 show only the critical components and traces for a minimum footprint layout. ENABLE, Vout-programming, and other small signal pins need to be connected and routed according to the specific application.
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EN5366QI
Design Considerations for Lead-Frame Based Modules
Exposed Metal on Bottom Of Package
Lead frame offers 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. Only the large thermal pad and the perimeter pads are to be mechanically or electrically connected to the PC board. The PCB top layer under the EN5366QI should be clear of any metal except for the large thermal pad. The "grayed-out" area in Figure 7 represents the area that should be clear of any metal (traces, vias, or planes), on the top layer of the PCB. Figure 8 demonstrates the recommended PCB footprint for the EN5366QI. Figure 9 shows the shape and location of the exposed metal pads as well as the mechanical dimension of the large thermal pad and the pins.
Ground copper my extend under this pad. However, DO NOT CONNECT (NC)
Figure 7. Lead-Frame exposed metal. Grey area highlights exposed metal that is not to be mechanically or electrically connected to the PCB.
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EN5366QI
Figure 8. Recommended footprint for PCB.
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EN5366QI
Package Dimensions
Figure 9. Package dimensions.
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EN5366QI
Contact Information
Enpirion, Inc. Perryville III 53 Frontage Road, Suite 210 Hampton, NJ 08827 Phone: 908-894-6000 Fax: 908-894-6090 www.enpirion.com
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.
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