DEMO MANUAL DC2194A LTM4642IY 20VIN, DUAL 4A or SINGLE 8A DC/DC µMODULE REGULATOR Description Demonstration circuit of DC2194A features the LTM®4642IY, the wide input voltage, high efficiency and power density, dual 4A or single 8A DC/DC step-down µModule regulator. The step-down regulator operates from an input voltage range of 4.5V to 20V (or 2.5V min. with 5V external bias voltage at CPWR) and provides an adjustable output voltage range from 0.6V to 5V at 4A load current per channel. The part is capable of operating in dual phase single output, delivers up to 8A load current with interleaved two phases at 180 degrees. Differential output voltage sensing is available on Channel 1 for applications requiring more accurate output load regulation. A user-selectable mode input is provided to allow users to trade off ripple noise for light load efficiency: Discontinuous Mode (DCM) of operation delivers higher efficiency at light load while Continuous Conduction Mode (CCM) is preferred for noise sensitive applications. The mode pin can also be used to sync the switching frequency to an external clock. Programmable switching frequency range is from 600kHz to 1400kHz with a ±30% synchronization capture range. Constant on time, valley current mode control architecture and integrated internal control loop compensation allow very fast transient response to line and load changes while maintaining loop stability. It is recommended to read the data sheet and demo manual of LTM4642 prior using or making any changes to DC2194A. Design files for this circuit board are available at http://www.linear.com/demo/DC2194A L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Board Photo dc2194af 1 DEMO MANUAL DC2194A Performance Summary PARAMETER Specifications are at TA = 25°C CONDITIONS VALUE Dual Phase Dual Output Configuration (Default) Input Voltage Range 4.5V to 20V Input Voltage Range 2.5V to 20V (with External CPWR Bias Supply) Default Output Voltage VOUT1 VOUT2 VIN = 4.5V to 20V ILOAD = 0A to 4A fSW = 800kHz Default Switching Frequency Programmed Frequency with an External Resistor from FREQ Pin to SGND Maximum Continuous Output Current IOUT per Channel (Dual Phase Dual Outputs) VIN = 4.5V to 20V fSW = 800kHz Output Voltage Ripples (Peak-to-Peak) VOUT1,P-P VOUT2,P-P (Dual Phase Dual Outputs) VIN = 12V fSW = 800kHz VOUT1 = 1.8V at IOUT1 = 4A VOUT2 = 1.2V at IOUT2 = 4A COUT = 1x150µF + 1x22µF per Channel VOUT1,P-P = 27mV (Figure 8a) VOUT2,P-P = 17mV (Figure 8b) Dynamic Load Transient Response VOUT1,P-P VOUT2,P-P (Dual Phase Dual Outputs) VIN = 12V fSW = 800kHz Mode = CCM VOUT1 = 1.8V, IOUT_STEP = 2A to 4A VOUT2 = 1.2V, IOUT_STEP = 2A to 4A COUT = 1x150µF + 1x22µF per Channel VOUT1,P-P = 86mV (Figure 7a) VOUT2,P-P = 67mV (Figure 7b) Efficiency (Dual Phase Dual Outputs) VIN = 12V fSW = 800kHz VOUT1 = 1.8V at IOUT1 = 4A VOUT2 = 1.2V at IOUT2 = 4A Thermal Performance (Dual Phase Dual Outputs) VIN = 12V fSW = 800kHz VOUT1 = 1.8V at IOUT1 = 4A VOUT2 = 1.2V at IOUT2 = 4A TA = 25°C, No Forced Airflow/Heat Sink 2 1.8V ±1.5% 1.2V ±1.5% 800kHz ±10% 4A Channel 1: 87.8% (Figure 4) Channel 2: 84.2% (Figure 4) 57.2°C Peak Temperature (Figure 11a) dc2194af DEMO MANUAL DC2194A Performance Summary PARAMETER Specifications are at TA = 25°C CONDITIONS VALUE Dual Phase Single Output Configuration (Optional) Input Voltage Range 4.5V to 20V Input Voltage Range 2.5V to 20V (with External CPWR Bias Supply) Default Output Voltage VOUT VIN = 4.5V to 20V ILOAD = 0A to 8A fSW = 800kHz Default Switching Frequency Programmed Frequency with External Resistor from FREQ Pin to SGND Maximum Continuous Output Current IOUT (Dual Phase Single Output) VIN = 4.5V to 20V fSW = 800kHz Output Voltage Ripples (Peak-to-Peak) VOUT,P-P (Dual Phase Single Output) VIN = 12V fSW = 800kHz VOUT = 1.8V at IOUT = 8A COUT = 1x100µF + 1x47µF per channel VOUT,P-P = 10mV (Figure 10a) Dynamic Load Transient Response VOUT,P-P (Dual Phase Single Output) VIN = 12V fSW = 800kHz Mode = CCM VOUT = 1.8V, IOUT_STEP = 4A to 8A COUT = 1x100µF + 1x47µF per Channel VOUT,P-P = 138mV (Figure 9b ) Efficiency (Dual Phase Single Output) VIN = 12V fSW = 800kHz Mode = CCM VOUT = 1.8V at IOUT = 8A Thermal Performance (Dual Phase Single Output) VIN = 12V fSW = 800kHz VOUT = 1.8V at IOUT = 8A TA = 25°C, No Forced Airflow/Heat Sink 1.8V ±1.5% 800kHz ±10% 8A 87.9 % (Figure 6) 59.2°C Peak Temperature (Figure 12a) dc2194af 3 DEMO MANUAL DC2194A Quick Start Procedure Demonstration circuit DC2194A is easy to set up to evaluate the performance of the LTM4642. Please refer to Figure 1 for proper measurement equipment setup and follow the procedures below: probe placement technique. Short, still leads need to be soldered to the (+) and (–) terminals of an output capacitor. The probe’s ground ring needs to touch the (–) lead and the probe tip needs to touch the (+) lead. 1. With power off, connect the input power supply at VIN (J4) and GND (J5) 6. DC2194A provides convenient on board BNC terminals to accurately measure output ripples of Channel 1 and Channel 2. Connect short BNC cables from VOUT1, VOUT2 to the scope inputs (Scope probe ratio 1:1, AC coupling) to observe output voltage ripples. 2. Connect the first load between VOUT1 (J6) and GND (J7) for Channel 1, connect the second load between VOUT2 (J8) and GND (J3) for Channel 2. Preset all the loads to 0A. 3. Connect the DMMs at the input (E4 and E5) to monitor input voltage. Connect DMMs at VO1+ (E6) and VO1– (E7), VO2+ (E11) and VO2– (E9) to monitor DC output voltages. These output voltage test points are Kelvin sensed directly across COUT1 for Channel 1 and COUT4 for Channel 2 to provide accurate measurement of output voltages. Do not apply load current to any of the above test points to avoid damage to the regulator. Do not connect the ground leads of scope probes to VO1– and VO2–. 4. Turn on the power supply at the input. Measure and make sure the input supply voltage is 12V. Place the RUN 1 (JP4) and RUN2 (JP5) in the “ON” position. The output voltage should be 1.8V ±1.5% for Channel 1 and 1.2 ±1.5% for Channel 2. 5. Once the input and output voltages are properly established, adjust the input voltage between 4.5V and 20V and the loads within the operating range of 0A to 4A max per channel. Observe the output voltage regulation, output voltage ripples, switch node waveform, load transient response and other parameters. Refer to Figure 2 for proper output voltage ripple measurement. NOTE 1: To measure the input/output voltage ripple properly, do not use the long ground lead on the oscilloscope probe. See Figure 2 for the proper scope 4 7. DC2194A provides an optional onboard load transient circuit to measure ∆VOUT peak-to-peak deviation during rising or falling dynamic load transient. The simple load step circuit consisting of a 30V N-channel power MOSFET in series with a 10mΩ, 1W,1% current sense resistor. The MOSFET is configured as a voltage control current source (VCCS) device, therefore the output current step and its magnitude is created and controlled by adjusting the amplitude of the applied input voltage step at the gate of the MOSFET. Use a function generator to provide a voltage pulse between IOSTEP CLK (E17) and GND (E18); the input voltage pulse should be set at the frequency less than 10Hz and maximum duty cycle of less than 5% to avoid excessive thermal stress on the MOSFET device. The output current step is measured directly across the 10mΩ current sense resistor and monitored by connecting a BNC cable from IOSTEP to the input of the oscilloscope (scope probe ratio 1:1, DC coupling), the equivalent voltage to current scale is 10mV/1A. The load step current slew rate dI/dt can be set by adjusting the rising time and fall time of the input voltage pulse. The default load step circuit is connected to VOUT1 but can be used for VOUT2 by simply removing the zero Ohm jumper R27 and stuffing it at the position of R28 and vice versa. Repeat Step 7 to perform load step transient evaluation for Channel 2. dc2194af DEMO MANUAL DC2194A Quick Start Procedure – + + LOAD1 (0A TO 4A) – LOAD2 (0A TO 4A) + – + VOUT1 – VOUT2 – + VIN 4.5V TO 20V + – + – Figure 1. Proper Measurement Equipment Setup + VOUT – COUT GND Figure 2. Scope Probe Placement for Measuring Input or Output Voltage Ripple dc2194af 5 DEMO MANUAL DC2194A Quick Start Procedure 8. To program other output voltages for Channel 1 or Channel 2, insert correct values of the bottom feedback resistors (Table 1). These values are calculated based on a typical feedback reference voltage of 0.6V and fixed internal top feedback resistor of 60.4kΩ. Table 1. Bottom Resistive Divider Values (1%) for Setting Typical Output Voltages VOUT (V) 1.0 1.2 1.5 1.8 2.5 3.3 5.0 RBOT (kΩ) 90.9 60.4 40.2 30.1 19.1 13.3 8.25 * NOTE 2: LTM4642 has been internally compensated for most of input, output voltages and frequency ranges. However, to obtain the best efficiency, thermal and load transient response performance when selecting output voltages different than the demo board default set voltages, the following parameters need to be optimized accordingly: input voltages, switching frequency, output capacitors and optional external compensation values (Feedforward Capacitors: C1, C12 and CCOMP: C3, C11). Please refer to Table 2 for more details. Table 2. Suggested Optimized Switching Frequency for Typical Input and Output Voltages VIN (V) 3.3V 5.0V 5V 12V 12V 12V 20V 20V 20V VOUT (V) 1V 1V 1.8V 1.0V 1.5V 2.5V 1V 1.5V 2.5V 1.2V 1.2V 2.5V 1.2V 1.8V 3.3V 1.2V 1.8V 3.3V 1.5V 1.5V 3.3V 2.5V 5.0V 5.0V 1.8V 1.8V fSW (kHz) 600 650 800 650 800 1000 1200 650 800 1000 1200 R5 (kΩ) R_freq 68.1 66.5 49.9 66.5 49.9 39.2 32.4 66.5 49.9 39.2 32.4 Differential Output Voltage Sensing The LTM4642 includes an internal low offset, high input impedance, unity gain, high bandwidth differential amplifier for applications that require true remote sensing. This feature allows users to accurately sense the output voltage across the output capacitor at the load point in a widely distributed power system where power trace’s parasitic voltage drops are always presented. The differential amplifier’s output is internally connected to the error amplifier’s 6 inverting input. VOUTS1+ and VOUTS1– are Kelvin connected directly across COUT1 on DC2194A. (Optional) Output Voltage Tracking TRK/SS1 and TRK/SS2 allow users to program output voltage supply tracking during start-up or shutdown while operating several voltage supply rails at the same time. Channel 1 is configured as a master and Channel 2 is a slave channel on DC2194A. Coincident tracking mode can be implemented by connecting TRK/SS2 of the slave channel to the mid-point of an additional resistive divider (R19, R20) to the master channel’s output voltage. The ratio of this divider is identical to that of the slave’s channel feedback divider. In this tracking mode, output voltage of the master channel must be higher than the output voltage of the slave channel. The rising time of the output voltage can be adjusted by changing the soft start capacitor’s values of the master channel. Coincident tracking mode can be activated by inserting JP6 between Pin 1 and 2 of TRACK2 SEL and performing start-up/shutdown by releasing RUN1 from GND and pulling RUN1 to GND accordingly. Tracking mode can be observed by monitoring VOUT1, VOUT2 and FB1, FB2 using scope probes. The same method can be used to configure VOUT1 or VOUT2 tracking an external supply voltage by inserting JP3 (TRK1 SEL) to TRACK or JP6 (TRK2 SEL) to EXT, applying an external voltage supply at TRACK1 (E8) or TRACK2 (E13) and repeating start-up/ shutdown test to evaluate the tracking function of the regulator. Ratiometric tracking mode can be achieved by connecting TRK/SS2 to FB1. Ratiometric tracking mode can save two resistors while coincident tracking mode offers better voltage regulation. It is optional for users to determine the most appropriate tracking method for the power supply design. (Optional) External Frequency Synchronization The MODE/PLLIN pin can be used to synchronize the internal oscillator clock frequency to the external clock signal. Place JP2 (MODE/PLLIN) to CLKIN, apply an external clock at CLKIN (E10) to vary the switching frequency within ±30% of the set frequency. The external clock input high threshold is 2V typical, while the input low threshold is 0.5V. dc2194af DEMO MANUAL DC2194A Quick Start Procedure (Optional) Lower the Default Current Limit Setting for Channel 1 The default current limit setting for Channel 1 is 7A peak current limit with VRNG1 tied to INTVCC. DC2194A provides an option to lower the peak current limit setting for Channel 1 (applications that required lower peak current limit to effectively protect the power devices during temporary output overloaded condition or output shorted circuit) by adjusting the DC voltage level at VRNG1. An external resistive divider from INTVCC can be used to set the voltage on VRNG pin between 1V to 0.6V, lower the VRNG1 voltage than 1V resulting in a lower maximum sense voltage and peak current limit. (Optional) Operation with Low VIN Range (2.5V ≤ VIN ≤ 4.5V) LTM4642 is equipped with CPWR pin, allowing VIN to operate down to VIN = 3.3V typical. CPWR pin is the main input power to the control IC and can be disconnected from the default VIN supply voltage (Remove R13) and tied to an external 5V bias supply voltage at E14. If the DC bias supply voltage for CPWR is less than 5.3V, DRVCC can also be tied to this pin by stuffing R15 = 0Ω. Since the RUN pins of Channel 1 and Channel 2 are directly tied to VIN, pull up resistors at the RUN pins (R9, R23) should be re-calculated and inserted to make sure the part can start up at low VIN. A good value to start with is 115kΩ using internal RUN pin pull-down resistor of 100k, RUN Pin On threshold of 1.1V min. to 1.3V max and RUN pin absolute max voltage of 6V. Care should be taken by not exceeding maximum voltage rating on DRVCC/INTVCC pin when operating in this mode. Refer to Table 2. for recommended optimized switching frequency while operating at low VIN voltage range. (Optional) Operation with EXTVCC EXTVCC pin is available for optional external 5V bias supply to power INTVCC/DRVCC. The advantage of using EXTVCC is to shut down the internal LDO powered from VIN, turn on the internal EXTVCC switch and directly source the external 5V bias supply to power INTVCC/DRVCC, therefore improving overall efficiency and reducing temperature rise of the part, especially at high input voltage range. An onboard turret (E3) is available for EXTVCC with a minimum of 4.7µF decoupling ceramic capacitor to PGND. Do not exceed the maximum rated voltage for EXTVCC and make sure VIN is powered up before applying EXTVCC. (Optional) Dual Phase Single Output Circuit Configuration: DC2194A can be configured as dual phase single output to provide up to 8A total load current. The following simple modification is required: (Channel 1 is master, Channel 2 is slave). Please refer to Table 3 for more details. Table 3. Dual Phase Single Output Circuit Configuration PIN NAME CONNECTIONS 1 VOUT1 VOUT2 2 FB2 3 COMP2 4 RUN1 RUN2 MODIFIED COMPONENTS Tie VOUT1, VOUT2 together. Stuff R35 = 0Ω and short the exposed copper pads at VOUT1, VOUT2 on the bottom layer of the board . Tie to INTVCC to disable the EA of the slave channel. Remove FB2 bottom divider resistor (R17) and stuff R26 = 0Ω. Note: To calculate the required bottom feedback resistor divider for the master channel, use RTOP_EQUIV = (60.4k//60.4k) for dual phase single output. Left open or externally tied to COMP1. Remove C11. Tie RUN1, RUN2 together. Stuff R25 = 0Ω, R9 = 115kΩ, remove R23. 5 TRSK/SS2 Left open. Remove JP6. 6 PHASMD Tie to SGND or FLOAT: set phase interleaved 180° between CH1 and CH2. JP1 = SNGD or FLOAT. 7 PGOOD2 Left open. Remove R12. dc2194af 7 DEMO MANUAL DC2194A 100 95 95 90 90 85 85 EFFICIENCY (%) EFFICIENCY (%) Quick Start Procedure 80 75 70 1.0VOUT 1.2VOUT 1.5VOUT 1.8VOUT 2.5VOUT 3.3VOUT 65 60 65 50 0 1 2 3 LOAD CURRENT (A) 80 75 70 1.0VOUT 1.2VOUT 1.5VOUT 1.8VOUT 2.5VOUT 3.3VOUT 65 60 65 50 4 0 1 2 3 LOAD CURRENT (A) DC2194 F03 DC2194 F04 Figure 4. Measured Efficiency at 12VIN, 800kHz, Dual Phase Dual Outputs 95 95 90 90 85 85 80 80 EFFICIENCY (%) EFFICIENCY (%) Figure 3. Measured Efficiency at 5VIN, 800kHz, Dual Phase Dual Outputs 75 70 65 1.2VOUT 1.5VOUT 1.8VOUT 2.5VOUT 60 65 50 0 1 2 3 LOAD CURRENT (A) 75 70 1.0VOUT 1.2VOUT 1.5VOUT 1.8VOUT 2.5VOUT 3.3VOUT 65 60 65 50 4 0 1 2 3 4 5 6 LOAD CURRENT (A) DC2194 F05 7 8 DC2194 F06 Figure 5. Measured Efficiency at 20VIN, 800kHz, Dual Phase Dual Outputs Figure 6. Measured Efficiency at 12VIN, 800kHz, Dual Phase Single Output VO_P-P = 86mV VO_P-P = 67mV VOUT 50mV/DIV VOUT 50mV/DIV ILOAD 2A/DIV 2A TO 4A 50µs/DIV fSW = 800kHz VIN = 12V, VOUT = 1.8V ILOAD STEP = 2A TO 4A AT 2A/µs COUT_POSCAP = 1×150µF/4V/7mΩ COUT_CERAMIC = 1×22µF/10V/X7R/1206 CFF = 220pF DC2194 F07a Figure 7a. Load Transient Response (CH1) Dual Phase Dual Outputs 8 4 ILOAD 2A/DIV 2A TO 4A 50µs/DIV fSW = 800kHz VIN = 12V, VOUT = 1.2V ILOAD STEP = 2A TO 4A AT 2A/µs COUT_POSCAP = 1×150µF/4V/7mΩ COUT_CERAMIC = 1×22µF/10V/X7R/1206 CFF = 220pF DC2194 F07b Figure 7b. Load Transient Response (CH2) Dual Phase Dual Outputs dc2194af DEMO MANUAL DC2194A Quick Start Procedure 20MHz BWL 20MHz BWL VO_P-P = 27mV VO_P-P = 17mV VOUT 50mV/DIV VOUT 50mV/DIV 5µs/DIV fSW = 800kHz VIN = 12V, VOUT = 1.8V ILOAD = 4A COUT_POSCAP = 1×150µF/4V/7mΩ COUT_CERAMIC = 1×22µF/10V/X7R/1206 CFF = 220pF 5µs/DIV fSW = 800kHz VIN = 12V, VOUT = 1.2V ILOAD = 4A COUT_POSCAP = 1×150µF/4V/7mΩ COUT_CERAMIC = 1×22µF/10V/X7R/1206 CFF = 220pF DC2194 F08a Figure 8a. Output Ripple Voltage (CH1), Dual Phase Dual Outputs DC2194 F08b Figure 8b. Output Ripple Voltage (CH2) Dual Phase Dual Outputs VO_P-P = 138mV VO_P-P = 73mV VOUT 100mV/DIV VOUT 50mV/DIV ILOAD 2A/DIV 4A TO 6A 50µs/DIV fSW = 800kHz VIN = 12V, VOUT = 1.8V ILOAD STEP = 4A TO 6A AT 2A/µs COUT_CERAMIC = 1×100µF/6.3V/X5R/1206 + 1×47µF/6.3V/X5R/1206 CFF = 220pF ILOAD 5A/DIV 4A TO 8A 50µs/DIV fSW = 800kHz VIN = 12V, VOUT = 1.8V ILOAD STEP = 4A TO 8A AT 4A/µs COUT_CERAMIC = 1×100µF/6.3V/X5R/1206 + 1×47µF/6.3V/X5R/1206 CFF = 220pF DC2194 F09a Figure 9a. Load Transient Response, Dual Phase Single Output DC2194 F09b Figure 9b. Load Transient Response, Dual Phase Single Output 20MHz BWL 20MHz BWL VO_P-P = 10mV VO_P-P = 10.6mV VOUT 20mV/DIV VOUT 20mV/DIV 5µs/DIV fSW = 800kHz VIN = 12V, VOUT = 1.8V ILOAD = 8A COUT_CERAMIC = 1×100µF/6.3V/X5R/1206 + 1×47µF/6.3V/X5R/1206 CFF = 220pF Figure 10a. Output Ripple Voltage, Dual Phase Single Output DC2194 F10a 5µs/DIV fSW = 800kHz VIN = 20V, VOUT = 1.8V ILOAD = 8A COUT_CERAMIC = 1×100µF/6.3V/X5R/1206 + 1×47µF/6.3V/X5R/1206 CFF = 220pF DC2194 F10b Figure 10b. Output Ripple Voltage, Dual Phase Single Output dc2194af 9 DEMO MANUAL DC2194A Quick Start Procedure fSW = 800kHz VOUT1 = 1.8V, VOUT2 = 1.2V VIN = 12V, ILOAD = 4A PER PHASE TA = 25°C, NO FORCED AIRFLOW, NO HEAT SINK Figure 11a. Thermal Performance at 12VIN, Dual Phase Dual Outputs fSW = 800kHz VOUT = 1.8V VIN = 12V, ILOAD = 8A TA = 25°C, NO FORCED AIRFLOW, NO HEAT SINK Figure 12a. Thermal Performance at 12VIN, Dual Phase Single Output 10 fSW = 800kHz VOUT1 = 1.8V, VOUT2 = 1.2V VIN = 20V, ILOAD = 4A PER PHASE TA = 25°C, NO FORCED AIRFLOW, NO HEAT SINK Figure 11b. Thermal Performance at 20VIN, Dual Phase Dual Outputs fSW = 800kHz VOUT = 1.8V VIN = 20V, ILOAD = 8A TA = 25°C, NO FORCED AIRFLOW, NO HEAT SINK Figure 12b. Thermal Performance at 20VIN, Dual Phase Single Output dc2194af DEMO MANUAL DC2194A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 CIN1 CAP., ALUM. ELECT., 100µF, 25V, 7343 PANASONIC, 25SVPF100M 2 2 CIN2, CIN3 CAP., 22µF, X5R, 25V, 10%, 1206 MURATA, GRM31CR61E226KE15L 3 2 COUT1, COUT4 CAP., 22µF, X7R, 10V, 20%, 1206 MURATA, GRM31CR71A226K 4 2 COUT3, COUT6 CAP., ALUM. ELECT., 150µF, 4V, 7343 PANASONIC, EEFSX0G151E7 5 2 C1, C12 CAP., 220pF, C0G, 50V, 5%, 0603 AVX, 06035A221JAT2A 6 2 C5, C15 CAP., 0.01µF, X7R, 25V, 10%, 0603 TDK, C1608X7R1E103K080AA 7 4 C7, C8, C9, C20 CAP., 4.7µF, X5R, 25V, 10%, 0603 MURATA, GRM188R61E475KE11D 8 2 C16, C17 CAP., 1µF, X5R, 6.3V, 10%, 0603 MURATA, GRM188R60J105KA01D 9 1 C19 CAP., 1µF, X7R, 10V, 10%, 0805 AVX, 0805ZC105KAT2A 10 1 Q1 MOSFET SPEED SRS 30V 30A LFPAK RENESAS, RJK0305DPB-02#J0 11 8 R1, R2, R4, R13, R18, R31, R32, R33 RES., 0 OHM, 1/10W, 0603 VISHAY, CRCW06030000Z0EA 12 2 R3, R8 RES., 30.1k, 1/10W, 1%, 0603 VISHAY, CRCW060330K1FKEA 13 1 R5 RES., 49.9k, 1/10W, 1%, 0603 VISHAY, CRCW060349K9FKEA 14 6 R7, R17, R19, R20, R21, R22 RES., 60.4k, 1/10W, 1%, 0603 VISHAY, CRCW060360K4FKEA 15 2 R9, R23 RES., 255k, 1/10W, 1%, 0603 VISHAY, CRCW0603255KFKEA 16 3 R11, R12, R29 RES., 10k, 1/10W, 1%, 0603 VISHAY, CRCW060310K0FKEA 17 1 R14 RES., 2.2Ω, 1/10W, 1%, 0603 VISHAY, CRCW06032R20FKEA 18 1 R27 RES., 0Ω, 2010 TEPRO (NAKOMA), RNH6083 19 1 R30 RES., 0.010Ω, 1W, 1%, 2512 VISHAY, WSL2512R0100FEA 20 1 U1 I.C., LTM4642IY#PBF, BGA56-11.25X9X4.92 LINEAR TECH., LTM4642IY#PBF CAP., OPT, 1206 OPT Additional Demo Board Circuit Components 1 0 COUT2, COUT5 2 0 C2, C3, C4, C6, C10, C11, CAP., OPTION 0603 C13, C14, C18 OPT 3 0 R6, R16 RES., OPTION, 0805 OPT 4 0 R10, R15, R24, R25, R26, R34 RES., OPTION, 0603 OPT 5 0 R28 RES., OPT, 2010 OPT 6 0 R35 RES., OPTION, 2512 NIC, NRC100ZOTRF Hardware: For Demo Board Only 1 18 E1-E18 TEST POINT, TURRET, 0.094" MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0 2 1 JP1 CONN., HEADER, 1X4, 2mm WURTH ELEKTRONIK, 62000411121 3 2 JP2, JP6 CONN., HEADER, 2X3, 2mm WURTH ELEKTRONIK, 62000621121 4 3 JP3, JP4, JP5 CONN., HEADER, 1X3, 2mm WURTH ELEKTRONIK, 62000311121 5 6 XJP1-XJP6 SHUNT, 2mm WURTH ELEKTRONIK, 60800213421 6 3 J1, J2, J9 CONN, BNC, 5 PINS CONNEX, 112404 7 6 J3-J8 CONN., JACK, BANANA, NON-INSULATED, 0.218" KEYSTONE, 575-4 8 4 (STAND-OFF) STAND-OFF, NYLON, SNAP-ON, 0.500" KEYSTONE, 8833(SNAP ON) dc2194af 11 A B C D VO1+ VIN- GND o E7 VO1- 150uF 4V E8 30.1K 60.4K TRACK JP4 1 2 3 1 2 C6 OPT R10 OPT R9 VIN 255K 0.01uF 6 4 5 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. NOTE: UNLESS OTHERWISE SPECIFIED E15 OFF ON JP3 RUN1 SOFT-START 3 C5 R8 JP2 DCM 3 CCM 5 0 R4 VFB1 MODE/PLLIN CLKIN 1 2 R7 INTVCC E10 E12 3 2 1 R2 0 + COUT3 R1 0 VO1+ COUT2 OPT 1206 VIN 100uF 25V 25SVPF100M + CIN1 VOUT1 TRACK1 SEL. TRACK1 CLKIN CLKOUT JP1 60 90 o 120 o J7 J6 E6 E5 5 CLKOUT PHASE INTVCC VO1- GND VOUT1 1.8V / 4 A RUN1 J5 J4 4.5V-20V VIN VIN+ 4 RUN1 C2 OPT C1 R5 C3 OPT C4 49.9k OPT 0805 INTVCC R6 0 R33 4 2.375V<VIN<4.5V CPWR= EXT. 5V DRVCC, CPWR=VIN VRNG1 RUN1 TRKSS1 VFB1 COMP1 SW1 CPWR=VIN G4 G3 F5 F4 E3 H3 FREQ MODE_PLLIN CLKOUT PHASMD VOUTS1 VOUTS- VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 4.5V<VIN<5.3V R34 OPT SW1 E4 C3 D4 B4 F2 F3 H2 H1 G2 G1 F1 VOUT1 4.5V<VIN<20V VO1+ R3 220pF 30.1k 1% CIN3 22uF 25V 1206 OPT VFB1 COUT1 22uF 10V 1206 CIN2 22uF 25V 1206 4 G5 VIN1 G6 VIN1 G7 VIN1 GND A4 GND A5 3 U1 R12 10K INTVCC E1 LTM4642IY R11 10K INTVCC E16 R13 = 0 OHM R15 = OPT R13 = 0 OHM R15 = 0 OHM R13 = OPT R15 = OPT 3 E14 PGOOD1 PGOOD2 CPWR GND C2 GND A6 GND A7 PGGOD1 C6 PGOOD2 C7 4.7uF CPWR R13 0 B6 E2 D2 B3 C5 C4 D3 A3 E6 D7 D6 C1 B2 B1 A2 A1 OFF ON JP5 1 2 3 RUN2 OPT C11 SW2 R16 OPT C10 2 LT SCALE = NONE GL COUT4 22uF 10V 1206 __ ECO 0 60.4K 6 SOFT-START 5 DATE: N/A SIZE EXTVCC VO2- GND VOUT2 1.2V / 4 A RUN2 RUN2 TRACK2 E13 VFB2 J3 J8 VO2+ 1 DEMO CIRCUIT 2194A Thursday, January 28, 2016 IC NO. DATE 01/28/16 SHEET 1 OF 2 2 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only E2 60.4K R22 60.4K LTM4642IY TECHNOLOGY C15 0.01uF 60.4K R21 VOUT1 60.4K R20 R19 C12 220pF VOUT2 E3 E9 E11 GL APPROVED HIGH DENSITY, DUAL 4A STEP-DOWN m MODULE REGULATOR TITLE: SCHEMATIC R24 OPT 4 3 EXT 2 1 VOUT1 TRACK2 SEL. JP6 R18 C13 C9 4.7uF 6.3V VO2- 150uF 4V VOUT2 + COUT6 R15 CPWR OPT C8 4.7uF R32 0 COUT5 OPT 1206 R31 0 VO2+ PRODUCTION 2 1 DESCRIPTION REVISION HISTORY REV OPT R17 R14 2.2 INTVCC C20 4.7uF APPROVALS C14 OPT R23 255K VIN OPT 0805 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CUSTOMER NOTICE SGND SGND RUN2 TRKSS2 VFB2 COMP2 SW2 DRVCC INTVCC EXTVCC VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 2 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. VIN2 F6 GND D1 GND D5 GND E1 GND E5 GND E7 GND F7 GND H4 C7 H6 GND H5 CPWR GND B5 GND H7 B7 VIN2 12 VIN2 E4 A B C D DEMO MANUAL DC2194A Schematic Diagram dc2194af Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. A B C D 5 VOUT1 INTVCC RUN1 OPT 2512 R35 OPT R26 OPT R25 VOUT2 VFB2 RUN2 4 OPTIONAL JUMPER FOR DUAL PHASE SINGLE OUTPUT CONFIGURATION 4 VOUT1 VOUT1 J1 0 Ohm 2010 R27 IOSTEP 10mV / A J9 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE GL LT APPROVALS C18 OPT C19 1uF 0805 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 3 2 C17 1uF 2 DATE: N/A SIZE VOUT2 J2 1 GND IOSTEP CLK 1 DEMO CIRCUIT 2194A Thursday, January 28, 2016 IC NO. SHEET 2 HIGH DENSITY, DUAL 4A STEP-DOWN m MODULE REGULATOR 2 OF 2 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only E18 LTM4642IY TECHNOLOGY R29 10K E17 VOUT2 VOUT2 DUTY CYCLE 5% MAX TITLE: SCHEMATIC R30 0.010 1W 2512 4 Q1 RJK0305DPB OPT 2010 R28 Load Transient Circuit CUSTOMER NOTICE C16 1uF VOUT1 3 5 3 2 1 5 A B C D DEMO MANUAL DC2194A Schematic Diagram dc2194af 13 DEMO MANUAL DC2194A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation 14 Linear Technology Corporation dc2194af LT 0216 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2016