LTM4642IY LINER | Alldatasheet
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20VIN, DUAL 4A or SINGLE 8A DC/DC µMODULE REGULATOR Demonstration circuit of DC2194A features the LT M®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 ap - plications 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: Discontinu- ous Mode (DCM) of operation delivers higher efficiency at light load while Continuous Conduction Mode (CCM) is BOARD PHOTO 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, L T , L TC, L TM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
PARAMETER 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 1.8V ±1.5% 1.2V ±1.5% Default Switching Frequency Programmed Frequency with an External Resistor from FREQ Pin to SGND 800kHz ±10% Maximum Continuous Output Current I OUT per Channel (Dual Phase Dual Outputs) VIN = 4.5V to 20V fSW = 800kHz Output Voltage Ripples (Peak-to-Peak) V OUT1,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 T ransient Response V OUT1,P-P VOUT2,P-P (Dual Phase Dual Outputs) VIN = 12V fSW = 800kHz Mode = CCM V OUT1 = 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) V IN = 12V fSW = 800kHz VOUT1 = 1.8V at IOUT1 = 4A VOUT2 = 1.2V at IOUT2 = 4A Channel 1: 87.8% (Figure 4) Channel 2: 84.2% (Figure 4) Thermal Performance (Dual Phase Dual Outputs) V IN = 12V fSW = 800kHz VOUT1 = 1.8V at IOUT1 = 4A VOUT2 = 1.2V at IOUT2 = 4A TA = 25°C, No Forced Airflow/Heat Sink 57.2°C Peak Temperature (Figure 11a) PERFORMANCE SUMMARY Specifications are at TA = 25°C
PERFORMANCE SUMMARY Specifications are at TA = 25°C PARAMETER 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 1.8V ±1.5% Default Switching Frequency Programmed Frequency with External Resistor from FREQ Pin to SGND 800kHz ±10% Maximum Continuous Output Current I OUT (Dual Phase Single Output) VIN = 4.5V to 20V fSW = 800kHz Output Voltage Ripples (Peak-to-Peak) V OUT ,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 T ransient Response V OUT ,P-P (Dual Phase Single Output) VIN = 12V fSW = 800kHz Mode = CCM V OUT = 1.8V, IOUT_STEP = 4A to 8A COUT = 1x100µF + 1x47µF per Channel VOUT ,P-P = 138mV (Figure 9b ) Efficiency (Dual Phase Single Output) V IN = 12V fSW = 800kHz Mode = CCM V OUT = 1.8V at IOUT = 8A 87.9 % (Figure 6) Thermal Performance (Dual Phase Single Output) V IN = 12V fSW = 800kHz VOUT = 1.8V at IOUT = 8A TA = 25°C, No Forced Airflow/Heat Sink 59.2°C Peak Temperature (Figure 12a)
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: 1. With power off, connect the input power supply at VIN (J4) and GND (J5) 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 moni- tor 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 estab- lished, 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 regula- tion, 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 oscil loscope probe. See Figure 2 for the proper scope 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. 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. 7. DC2194A provides an optional onboard load transient circuit to measure ∆VOUT peak-to-peak deviation dur- ing 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 cur- rent 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.
- To program other output voltages for Channel 1 or
Table 1. Bottom Resistive Divider Values (1%) for Setting for most of input, output voltages and frequency ranges. Table 2. Suggested Optimized Switching Frequency for Typical directly across COUT1 on DC2194A. operating several voltage supply rails at the same time. the soft start capacitor ’s values of the master channel.
sense voltage and peak current limit. sure VIN is powered up before applying EXTVCC. to provide up to 8A total load current. Table 3. Dual Phase Single Output Circuit Configuration
1 VOUT1
2 FB2 Tie to INTVCC to disable the EA of the slave channel. Remove FB2 bottom divider resistor (R17) and stuff R26 = 0Ω. 3 COMP2 Left open or externally tied to COMP1. Remove C11.
4 RUN1
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°
7 PGOOD2 Left open. Remove R12.
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), RN H6083 19 1 R30 RES., 0.010Ω, 1W, 1%, 2512 VISHAY, WSL2512R0100FEA Additional Demo Board Circuit Components 1 0 COUT2, COUT5 CAP ., OPT , 1206 OPT 2 0 C2, C3, C4, C6, C10, C11, C13, C14, C18 CAP ., OPTION 0603 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)
4.5V-20V 1.8V / 4 A NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. 6.3V ON 10V 1.2V / 4 A TRACK1 SEL. CCM DCM SOFT-START EXT OFF 25SVPF100M RUN1 CLKOUT PHASE 120 o o o
2 PRODUCTION GL 01/28/16
m 25V 4.5V<VIN<20V 4.5V<VIN<5.3V 2.375V<VIN<4.5V CPWR=VIN DRVCC, CPWR=VIN CPWR= EXT. 5V R13 = 0 OHM R15 = OPT R15 = 0 OHM R13 = OPT R15 = OPT R13 = 0 OHM VIN VO1+ VO1- INTVCC VOUT1 INTVCC VO1+ INTVCC VFB1 VFB1 INTVCC INTVCC INTVCC CPWR CPWR VOUT1 VOUT2 VIN VIN VO2+ VO2- VOUT2 VOUT1 VFB2 RUN1 RUN2 VOUT2
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV DESCRIPTION DATEAPPROVEDECO REV DESCRIPTION DATEAPPROVEDECO REV SIZE DATE: IC NO. REV. SHEET OF TITLE: APPROVALS PCB DES. APP ENG. TECHNOLOGY Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com Thursday, January 28, 2016 12 HIGH DENSITY, DUAL 4A STEP-DOWN N/A LTM4642IY DEMO CIRCUIT 2194A MODULE REGULATOR SIZE DATE: IC NO. REV. SHEET OF TITLE: APPROVALS PCB DES. APP ENG. TECHNOLOGY Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com Thursday, January 28, 2016 12 HIGH DENSITY, DUAL 4A STEP-DOWN N/A LTM4642IY DEMO CIRCUIT 2194A MODULE REGULATOR SIZE DATE: IC NO. REV. SHEET OF TITLE: APPROVALS PCB DES. APP ENG. TECHNOLOGY Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com Thursday, January 28, 2016 12 HIGH DENSITY, DUAL 4A STEP-DOWN N/A LTM4642IY DEMO CIRCUIT 2194A MODULE REGULATOR R34 OPT 60.4K 4.7uF E4VIN+ C14 OPT VOUT1 GND R32 R19 60.4K CIN3 22uF 25V 1206 E7VO1- R11 10K R33 VIN COUT4 22uF 1206 COUT2 OPT 1206 R12 10K R24 OPT GND JP5 VOUT2 LTM4642IY VOUT1F1 VOUT1G1 VOUT1G2 VOUT1H1 VIN1G7 VIN1G6 VIN1G5 VOUTS-F3 VOUTS1F2 CLKOUTD4 TRKSS1F5 RUN1G3 VRNG1G4 COMP1E3 PHASMDB4 GNDC2 GNDD1 GNDD5 GNDE1 GNDH6 GNDE5 GNDE7 GNDF7 GNDH4 GNDH5 SGND E2 SGND D2 RUN2 B3 TRKSS2 C5 VFB2 C4 COMP2 D3 DRVCC E6 INTVCC D7 EXTVCC D6 MODE_PLLINC3 FREQE4 SW1H3 VFB1F4 VOUT2 C1 VOUT2 B2 VOUT2 B1 VOUT2 A2 PGGOD1F6 PGOOD2C6 CPWRC7 VIN2B5 VIN2B6 VIN2B7 VOUT1H2 VOUT2 A1 GNDH7 SW2 A3 GNDA4 GNDA5 GNDA6 GNDA7 R14 2.2 C15 0.01uF COUT1 22uF 10V 1206 COUT5 OPT 1206 E12CLKOUT OPT VOUT1 TRACK2 SEL. JP6 5 6 C12 220pF OPT CPWR E14 R10 OPT R31 TRACK2 E13 JP1 R23 255K R22 60.4K JP3 SOFT-START TRACK E6VO1+ C10 OPT CIN2 22uF 25V 1206 GND + COUT6 150uF 4.7uF JP4 C20 4.7uF MODE/PLLIN JP2 5 6 OPT R20 60.4K 220pF R15 OPT 49.9k R13 OPT 0805 E11 VO2+ 0.01uF E15 RUN1 RUN2 R17 60.4K 255K SW1 E10 CLKIN + CIN1 100uF E9 VO2- SW2 C13 OPT 4.7uF 30.1K EXTVCC PGOOD2 R16 OPT 0805 E5VIN- + COUT3 150uF R18 PGOOD1 E16 OPT R21 60.4K E8TRACK1 C11 OPT 30.1k
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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. SCHEMATIC DIAGRAM D D C C B B A A OPTIONAL JUMPER FOR DUAL PHASE SINGLE OUTPUT CONFIGURATION VOUT1 Load Transient Circuit VOUT2 LT GL m DUTY CYCLE 5% MAX IOSTEP 10mV / A INTVCC VOUT2VOUT1 VOUT1 VOUT2 RUN1 RUN2 VFB2 VOUT2VOUT1 SIZE DATE: IC NO. REV. SHEET OF TITLE: APPROVALS PCB DES. APP ENG. TECHNOLOGY Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com Thursday, January 28, 2016 22 HIGH DENSITY, DUAL 4A STEP-DOWN N/A LTM4642IY DEMO CIRCUIT 2194A MODULE REGULATOR SIZE DATE: IC NO. REV. SHEET OF TITLE: APPROVALS PCB DES. APP ENG. TECHNOLOGY Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com Thursday, January 28, 2016 22 HIGH DENSITY, DUAL 4A STEP-DOWN N/A LTM4642IY DEMO CIRCUIT 2194A MODULE REGULATOR SIZE DATE: IC NO. REV. SHEET OF TITLE: APPROVALS PCB DES. APP ENG. TECHNOLOGY Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com Thursday, January 28, 2016 22 HIGH DENSITY, DUAL 4A STEP-DOWN N/A LTM4642IY DEMO CIRCUIT 2194A MODULE REGULATOR R29 10K IOSTEP CLK E17 R25 OPT C18 OPT C16 1uF R28 OPT 2010 RJK0305DPB J1 C17 1uF GND E18R35 OPT 2512 R27
0 Ohm
0.010 2512
DEMO MANUAL DC2194A Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear .com © LINEAR TECHNOLOGY CORPORATION 2016 LT 0616 REV A • PRINTED IN USA 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