DEMO MANUAL DC2435A-A/ DC2435A-B/DC2435A-C LTC7813EUH 4V to 56V VIN, Step-Up/Step-Down Power Supply Description Demonstration circuit DC2435A is a step-up/down supply featuring the LTC®7813EUH. The LTC7813 is a high performance dual output (buck and boost) synchronous DC/DC switching regulator controller. The board has three different configurations: DC2435A-A: Regulated output voltage of 24 Volt DC2435A-B: Narrowed output voltage between 20V and 28V DC2435A-C:Dual output voltages of 24V (Boost VBUS channel) and 5V (Buck VOUT1 channel) The circuit enables a drop-in layout where the total circuit area is only 1½" by 1½". The LTC7813EUH is in a 32-lead exposed pad QFN package. The main features of the board include rail tracking (buck channel only), an internal 5V linear regulator for bias, separate RUN pins for each output and a Mode selector that allows the converter to run in CCM, pulse-skipping or Burst Mode operation. Synchronization to an external clock is also possible. Performance Summary The LTC7813 buck input is supplied from the Boost output for the DC2435A-A and DC2435A-B only. With this boostthen-buck topology, the buck outputs maintain regulation over the entire input range of 4V to 56V, making it suitable for automotive or other battery fed applications where low quiescent current is important. The DC2435A-B is designed such that VOUT is partially regulated between 20V and 28V for higher efficiency (Figure 5a), reduced power loss, and switching noise. When VIN is between 20V and 28V, it operates in passthru mode with the boost synchronous FET fully on and the buck in drop-out with >99% duty cycle. When VIN is below 20V, the boost is activated and when VIN is above 28V, the buck is activated as shown in Figure 5b. The LTC7813 data sheet gives a complete description of the part, operation and application information and must be read in conjunction with this quick start guide. Design files for this circuit board are available at http://www.linear.com/demo/DC2435A 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. Specifications are at TA = 25°C Table 1 SYMBOL PARAMETER VIN VOUT1 Input Supply Range Output1 Voltage Range VBUS fSW CONDITIONS -A -B -C MIN VIN = 4V* – 56V, IOUT1 = 0A to 5A# VBUS Voltage Range (-C only) VIN < 24V Typical Free Running Switching Frequency Efficiency See Figures 4, 5, 6 and 7 for -A VIN = 14V, VOUT1 = 24V, IOUT1 = 5A VIN = 48V, VOUT1 = 24V, IOUT1 = 5A efficiency curves -B VIN = 14V, VOUT1 = 20V, IOUT1 = 5A VIN = 24V, VOUT1 = 24V, IOUT1 = 5A VIN = 48V, VOUT1 = 28V, IOUT1 = 5A -C VIN = 14V, VBUS = 24V, IBUS = 3A VIN = 14V, VOUT1 = 5V, IOUT1 = 8A VIN = 48V, VOUT1 = 5V, IOUT1 = 8A # IOUT1 starts to de-rate when VIN < 14V. * VIN needs to be > 8V to start up. 4 23.5 19 4.9 23.5 200 TYP 24 5** 24 94.6 96.9 96.3 98.5 97.3 97.1 92.8 88.9 MAX UNITS 56 24.5 28.6 5.1 24.5 kHz V V V V V % % % % % % % % ** VOUT1 follows VIN when VIN < 5V. dc2435af 1 DEMO MANUAL DC2435A-A/ DC2435A-B/DC2435A-C Demo Board Options Figure 1. DC2435A/LTC7813 Demo Board Options Quick Start Procedure DC2435A is easy to set up to evaluate the performance of the LTC7813EUH. Refer to Figure 2 for proper measurement equipment setup and follow the procedure below: NOTE: When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the input or output voltage ripple by touching the probe tip directly across the VIN or VOUT and GND terminals or directly across relevant capacitor. See Figure 3 for proper scope probe technique. 1. Place jumpers in the following positions: JP1ON JP2ON JP3FCM 2. With power off, connect the input power supply to VIN and GND. 2 3. Turn on the power at the input. NOTE: Make sure that the input voltage is higher than 8V and does not exceed 56V. 4. Check for the proper output voltages for different boards. -A:VOUT1 = 23.5V to 24.5V, -B: 19V < VOUT1 < 28.6V, -C:VOUT1 = 4.9V to 5.1V; VBUS = 23.5V to 24.5V (VIN < 24V) NOTE: If there is no output, temporarily disconnect the load to make sure that the load is not set too high. 5. Once the proper output voltages are established, adjust the loads within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters. dc2435af DEMO MANUAL DC2435A-A/ DC2435A-B/DC2435A-C Quick Start Procedure -‐ A IOUT V -‐ + Load + IOUT -‐ A Load + -‐ V + A IIN + Vin supply -‐ + V -‐ -‐ + Figure 2. Proper Measurement Equipment Setup + VOUT – COUT GND Figure 3. Measuring Input or Output Ripple Across Terminals or Directly Across Ceramic Capacitor dc2435af 3 DEMO MANUAL DC2435A-A/ DC2435A-B/DC2435A-C Frequency Synchronization and Mode Selection DC2435A’s mode selector allows the converter to run in forced continuous operation, pulse skip operation, Burst Mode or be synchronizing to an external clock by changing the position of JP3. Table 2. Mode Selection and Synchronized Operation Options CONFIGURATION JP3 Forced Continuous Operation FCM Pulse-Skipping Operation PS/Sync Synchronized to External Clock Applied to CLKIN Pin PS/Sync Burst Mode Operation Burst Rail Tracking DC2435A is configured for an on board soft start circuit. The soft start ramp rate can be adjusted by changing the value of C47. DC2435A can also be modified to track an external reference. Refer to Table 3 for tracking options and to the data sheet for more details. Table 3. VOUT1 Tracking Options CONFIGURATION R34 R37 C47 TRK/SS1 TURRET Soft-Start Without Tracking (Default) OPEN OPEN 0.1µF OPEN Resistor Divider OPEN External Reference VOUT1 Tracking Scaled External Reference Optional Inductor DCR Current Sensing DC2435A provides an optional circuit for Inductor DCR Current Sensing. Inductor DCR Current Sensing uses the DCR of the inductor to sense the inductor current instead of discrete sense resistors. The advantages of DCR sensing are lower cost, reduced board space and higher efficiency, but the disadvantage is a less accurate current limit. If DCR sensing is used, be sure to select an inductor current with a sufficiently high saturation current or use an iron powder type material. Refer to Table 4 for Optional Inductor DCR Current Sensing setup and to the data sheet for more details. Table 4. Optional Inductor DCR Current Sensing CHANNEL 1 CONFIGURATION Current Sense Resistor (Default) Inductor DCR Current Sensing CHANNEL 2 RS1 R39 R40 C15 R51 R53 R62 RS2 R80 R81 C56 R89 R90 R91 Ref. Sch. Ref. Sch. Ref. Sch. Ref. Sch. OPEN OPEN OPEN 0Ω Copper OPEN OPEN Calculated Value from Data Sheet 0Ω Low Quiescent Current Applications and Measurement The typical quiescent current (IQ) of the LTC7813 controller is 29µA in sleep mode as specified in the LTC7813 data sheet. However, the input current of the DC2435A board can be higher than this value because of additional circuit outside of the IC. To reduce the total input current, large value FB divider resistors should be used. In addition, some of the optional pull-up resistors should be removed from 4 the board. Refer to Table 5 for the low input quiescent current setup. Table 5. Low Input Quiescent Current Configuration Reference Designator Function Stuffing Option R46 PGOOD1 OPEN dc2435af DEMO MANUAL DC2435A-A/ DC2435A-B/DC2435A-C 100 95 EFFICIENCY (%) 90 85 80 75 70 VIN = 48V, BURST VIN = 14V, BURST VIN = 48V, FCM VIN = 14V, FCM 65 60 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 IOUT (A) DC2435A F04 Figure 4. DC2435A-A VOUT1 Typical Efficiency vs Load Current 100 VOUT1 VOUT = VIN 95 VBUCK EFFICIENCY (%) 90 85 80 VBOOST 75 70 VIN = 14V VIN = 24V VIN = 48V 65 60 BUCK ACTIVE PASS-THRU “WIRE MODE” BOOST ACTIVE 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 IOUT (A) 20V VIN 28V DC2435A F05b DC2435A F05a Figure 5a. DC2435A-B VOUT1 Typical Efficiency vs Load Current Figure 5b. DC2435A-B VOUT1 Operating Modes vs VIN Figure 5. 100 100 90 95 EFFICIENCY (%) EFFICIENCY (%) 80 90 85 80 70 0 0.5 1 1.5 IOUT (A) 2 2.5 60 50 40 Burst Mode PULSE-SKIPPING FCM 75 70 VIN = 14V, BURST VIN = 14V, FCM VIN = 48V, BURST VIN = 48V, FCM 30 3 DC2435A F06 Figure 6. DC2435A-C VBUS Typical Efficiency vs Load Current (VIN = 14V) 20 0 1 2 3 4 5 IOUT (A) 6 7 8 9 DC2435A F07 Figure 7. DC2435A-C VOUT1 Typical Efficiency vs Load Current dc2435af 5 DEMO MANUAL DC2435A-A/ DC2435A-B/DC2435A-C 20MHz BW 20MHz BW 20mV/DIV 20mV/DIV 10µs/DIV DC2435A F08 10µs/DIV Figure 8. DC2435A-A VOUT1 Voltage Ripple at VIN = 14V Figure 9. DC2435A-A VOUT1 Voltage Ripple at VIN = 48V 20MHz BW 20MHz BW 200mV/DIV 200mV/DIV 100µs/DIV DC2435A F10 Figure 10. DC2435A-A VOUT1 0A to 2.5A Load Transient at VIN = 14V 6 DC2435A F09 100µs/DIV DC2435A F11 Figure 11. DC2435A-A VOUT1 0A to 2.5A Load Transient at VIN = 48V dc2435af DEMO MANUAL DC2435A-A/ DC2435A-B/DC2435A-C Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC2435A-A Required Circuit Components 1 2 CIN1, COUT1 CAP, 33µF, 63V, 20%, ELEC SUN ELEC. 63HVH33M 2 1 COUT2 CAP, 100µF, 63V, 20%, ELEC UNITED CHEMI CON, EMZA630ADA101MJA0G 3 6 CIN2, CIN3, CIN4, COUT6, COUT8, C80 CAP, 4.7µF, X7R, 100V, 10%,1210 MURATA, GRM32ER72A475KE14L 4 2 COUT4, C5 CAP, 2.2µF, X7R, 100V,10%,1206 MURATA, GRM31CR72A225KA73L 5 2 COUT5, COUT11 CAP, 68µF, 35V, 20%, D8 PANASONIC, EEHZA1V680XP 6 5 C4, C17, C21, C47, C52 CAP, 0.1µF, X7R, 25V ,10%, 0603 TDK, C1608X7R1E104K 7 3 C15, C56, C62 CAP, 1nF, X7R, 50V,10%,0603 AVX, 06035C102KAT2A 8 1 C43 CAP, 68pF, NPO, 50V, 10%,0603 AVX, 06035A680KAT2A 9 1 C44 CAP, 4.7nF, X7R, 50V,10%,0603 AVX, 06035C472KAT2A 10 1 C49 CAP, 47pF X7R, 50V, 5%, 0603 AVX, 06035A470JAT2A 11 1 C53 CAP, 820pF X7R, 50V, 5%, 0603 AVX, 06035A821JAT2A 12 1 C54 CAP, 27nF, X7R, 50V,10%, 0603 AVX, 06035C273KAT2A 13 1 C61 CAP, 1µF, X5R, 25V, 20%, 0603 TDK, C1608X5R1E105M 14 2 C64, C81 CAP, 4.7µF X5R,10V, 20%, 0603 AVX, 0603ZD475MAT2A 15 1 L1 IND, 22µH COILCRAFT, SER1390-223MLD 16 1 L2 IND, 15µH COILCRAFT, XAL1510-153MED 17 1 Q1 XSTR, N-CHANNEL MOSFET INFINEON, BSC123N08NS3G 18 1 Q2 XSTR, N-CHANNEL MOSFET INFINEON, BSC042NE7NS3G 19 1 Q21 XSTR, N-CHANNEL MOSFET INFINEON, BSC026N08NS5 20 1 Q22 XSTR, N-CHANNEL MOSFET INFINEON, BSC072N08NS5 21 1 R33 RES., 11.5kΩ,1/10W, 1%, 0603 VISHAY, CRCW060311K5FKEA 22 1 R35 RES., 7.5kΩ,1/10W, 1%, 0603 VISHAY, CRCW06037K5FKEA 23 2 R43, R78 RES., 332kΩ,1/10W, 1%, 0603 VISHAY, CRCW0603332KFKEA 24 2 R46, R48 RES., 100kΩ,1/10W, 5%, 0603 VISHAY, CRCW0603100KJNEA 25 1 R72 RES., 37.4kΩ,1/10W, 1%, 0603 VISHAY, CRCW060337K4FKEA 26 1 R75 RES., 3.6kΩ,1/10W, 1%, 0603 VISHAY, CRCW06033K60FKEA 27 1 R79 RES., 14.7kΩ,1/10W, 1%, 0603 VISHAY, CRCW060314K7FKEA 28 1 R81 RES., 100Ω,1/10W, 5%, 0603 VISHAY, CRCW0603100RJNEA 29 1 R86 RES., 2.2Ω,1/10W, 5%, 0603 VISHAY, CRCW06032R20JNEA 30 1 R92 RES., 90.9kΩ,1/10W, 1%, 0603 VISHAY, CRCW060390K9FKEA 31 1 RS1 RES., SENSE, 0.008Ω,1/2W, 1%, 2010 VISHAY, WSL20108L000FEA18 32 1 RS2 RES., SENSE, 0.006Ω,1/2W, 1%, 2010 VISHAY, WSL20106L000FEA18 33 1 U1 IC, LOW IQ, 60V BOOST + BUCK SYNCHRONOUS CONTROLLER LINEAR TECH. LTC7813EUH#PBF Additional Demo Board Circuit Components 1 0 C1, C2, C3, CIN5, C6, C59, C68 CAP, OPTION, 1210 OPTION 2 0 C36 CAP, OPTION, 1206 OPTION 3 0 C7, C39, C40, C51, C66, C67, C73, C74, CAP, OPTION, 0805 C78, C79 OPTION 4 0 C55, C57, C60, C63, C65, C77 OPTION CAP, OPTION, 0603 dc2435af 7 DEMO MANUAL DC2435A-A/ DC2435A-B/DC2435A-C Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 5 0 D3 DIODE, OPTION, SMB OPTION 6 0 D4 DIODE, OPTION, SOD323 OPTION 7 0 L3 IND, OPTION OPTION 8 0 Q9, Q11, Q18, Q19 XSTR, OPTION, N-CHANNEL MOSFET OPTION 9 11 R34, R36, R39, R40, R70, R80, R95, R96, R103, R105, R108 RES., 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA 10 0 R37, R51, R53, R55, R62, R85, R89, R90, R91, R93, R94, R104, R106, R107, R109, R110, R111 RES., OPTION, 0603 OPTION 11 0 R82 RES., OPTION, 1206 OPTION 12 0 R100 RES., OPTION, 0805 OPTION 13 0 R101 RES., OPTION, 2010 OPTION 14 1 R102 RES., 0Ω, 2010 VISHAY, CRCW20100000Z0EF 15 0 RS3 RES., SENSE, OPT, 2010 OPTION Hardware: For Demo Board Only 1 14 E1-E14 TURRET MILL-MAX, 2501-2-00-80-00-00-07-0 2 2 JP1, JP2 CONN., HEADER, 1×3, 2mm WURTH ELEKTRONIK, 620-003-111-21 3 1 JP3 CONN., HEADER, 2×3, 2mm WURTH ELEKTRONIK, 620-006-211-21 4 3 XJP1, XJP2, XJP3 SHUNT, 2mm WURTH ELEKTRONIK, 608-002-134-21 5 6 J1, J2, J3, J4, J5, J6 JACK, BANANA KEYSTONE, 575-4 6 0 J9, J10 PAD NONE 7 4 STANDOFF, SNAP ON KEYSTONE, 8832 DC2435A-B 1 2 CIN1, COUT1 CAP, 33µF, 63V, 20%, ELEC SUN ELEC. 63HVH33M 2 1 COUT2 CAP, 100µF, 63V, 20%, ELEC UNITED CHEMI CON, EMZA630ADA101MJA0G 3 6 CIN2, CIN3, CIN4, COUT6, COUT8, C80 CAP, 4.7µF, X7R, 100V, 10%,1210 MURATA, GRM32ER72A475KE14L 4 2 COUT4, C5 CAP, 2.2µF, X7R, 100V,10%,1206 MURATA, GRM31CR72A225KA73L 5 2 COUT5, COUT11 CAP, 68µF, 35V, 20%, D8 PANASONIC, EEHZA1V680XP 6 5 C4, C17, C21, C47, C52 CAP, 0.1µF, X7R, 25V ,10%, 0603 TDK, C1608X7R1E104K 7 3 C15, C56, C62 CAP, 1nF, X7R, 50V,10%,0603 AVX, 06035C102KAT2A 8 1 C43 CAP, 68pF, NPO, 50V, 10%,0603 AVX, 06035A680KAT2A 9 1 C44 CAP, 4.7nF, X7R, 50V,10%,0603 AVX, 06035C472KAT2A 10 1 C49 CAP, 47pF X7R, 50V, 5%, 0603 AVX, 06035A470JAT2A 11 1 C53 CAP, 820pF X7R, 50V, 5%, 0603 AVX, 06035A821JAT2A 12 1 C54 CAP, 27nF, X7R, 50V,10%, 0603 AVX, 06035C273KAT2A 13 1 C61 CAP, 1µF, X5R, 25V, 20%, 0603 TDK, C1608X5R1E105M 14 2 C64, C81 CAP, 4.7µF X5R,10V, 20%, 0603 AVX, 0603ZD475MAT2A 15 1 L1 IND, 22µH COILCRAFT, SER1390-223ML 16 1 L2 IND, 15µH COILCRAFT, XAL1510-153MED 17 1 Q1 XSTR, N-CHANNEL MOSFET INFINEON, BSC123N08NS3G 18 1 Q2 XSTR, N-CHANNEL MOSFET INFINEON, BSC042NE7NS3G 19 1 Q21 XSTR, N-CHANNEL MOSFET INFINEON, BSC026N08NS5 8 dc2435af DEMO MANUAL DC2435A-A/ DC2435A-B/DC2435A-C Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 20 1 Q22 XSTR, N-CHANNEL MOSFET INFINEON, BSC072N08NS5 21 1 R33 RES., 9.76kΩ,1/10W, 1%, 0603 VISHAY, CRCW06039K76FKEA 22 1 R35 RES., 7.5kΩ,1/10W, 1%, 0603 VISHAY, CRCW06037K5FKEA 23 2 R43, R78 RES., 332kΩ,1/10W, 1%, 0603 VISHAY, CRCW0603332KFKEA 24 2 R46, R48 RES., 100kΩ,1/10W, 5%, 0603 VISHAY, CRCW0603100KJNEA 25 1 R72 RES., 37.4kΩ,1/10W, 1%, 0603 VISHAY, CRCW060337K4FKEA 26 1 R75 RES., 3.6kΩ,1/10W, 1%, 0603 VISHAY, CRCW06033K60FKEA 27 1 R79 RES., 21kΩ,1/10W, 1%, 0603 VISHAY, CRCW060321K0FKEA 28 1 R81 RES., 100Ω,1/10W, 5%, 0603 VISHAY, CRCW0603100RJNEA 29 1 R86 RES., 2.2ΩS,1/10W, 5%, 0603 VISHAY, CRCW06032R20JNEA 30 1 R92 RES., 90.9kΩ,1/10W, 1%, 0603 VISHAY, CRCW060390K9FKEA 31 1 RS1 RES., SENSE, 0.008Ω,1/2W, 1%, 2010 VISHAY, WSL20108L000FEA18 32 1 RS2 RES., SENSE, 0.006Ω,1/2W, 1%, 2010 VISHAY, WSL20106L000FEA18 33 1 U1 IC, LOW IQ, 60V BOOST + BUCK SYNCHRONOUS CONTROLLER LINEAR TECH. LTC7813EUH#PBF Additional Demo Board Circuit Components 1 0 C1, C2, C3, CIN5, C6, C59, C68 CAP., OPTION, 1210 OPTION 2 0 C36 CAP,. OPTION, 1206 OPTION 3 0 C7, C39, C40, C51, C66, C67, C73, C74, CAP., OPTION, 0805 C78, C79 OPTION 4 0 C55, C57, C60, C63, C65, C77 CAP., OPTION, 0603 OPTION 5 0 D3 DIODE, OPTION, SMB OPTION 6 0 D4 DIODE, OPTION, SOD323 OPTION 7 0 L3 IND., OPTION OPTION 8 0 Q9, Q11, Q18, Q19 XSTR, OPTION, N-CHANNEL MOSFET OPTION 9 11 R34, R36, R39, R40, R70, R80, R95, R96, R103, R105, R108 RES., 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA 10 0 R37, R51, R53, R55, R62, R85, R89, R90, R91, R93, R94, R104, R106, R107, R109, R110, R111 RES., OPTION, 0603 OPTION 11 0 R82 RES., OPTION, 1206 OPTION 12 0 R100 RES., OPTION, 0805 OPTION 13 0 R101 RES., OPTION, 2010 OPTION 14 1 R102 RES., 0Ω, 2010 VISHAY, CRCW20100000Z0EF 15 0 RS3 RES., SENSE, OPT, 2010 OPTION Hardware: For Demo Board Only 1 14 E1-E14 TURRET MILL-MAX, 2501-2-00-80-00-00-07-0 2 2 JP1, JP2 CONN., HEADER, 1×3, 2mm WURTH ELEKTRONIK, 620-003-111-21 3 1 JP3 CONN., HEADER, 2×3, 2mm WURTH ELEKTRONIK, 620-006-211-21 4 3 XJP1, XJP2, XJP3 SHUNT, 2mm WURTH ELEKTRONIK, 608-002-134-21 5 6 J1, J2, J3, J4, J5, J6 JACK, BANANA KEYSTONE, 575-4 6 0 J9, J10 PAD NONE 7 4 STANDOFF, SNAP ON KEYSTONE, 8832 dc2435af 9 DEMO MANUAL DC2435A-A/ DC2435A-B/DC2435A-C Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC2435A-C 1 2 CIN1, COUT1 CAP, 33µF, 63V, 20%, ELEC SUN ELEC. 63HVH33M 2 1 COUT2 CAP, 100µF, 63V, 20%, ELEC UNITED CHEMI CON, EMZA630ADA101MJA0G 3 6 CIN2, CIN3, CIN4, COUT6, COUT8, C80 CAP, 4.7µF, X7R, 100V, 10%,1210 MURATA, GRM32ER72A475KE14L 4 2 COUT4, C5 CAP, 2.2µF, X7R, 100V,10%,1206 MURATA, GRM31CR72A225KA73L 5 2 COUT5, COUT11 CAP, 68µF, 35V, 20%, D8 PANASONIC, EEHZA1V680XP 6 5 C4, C17, C21, C47, C52 CAP, 0.1µF, X7R, 25V ,10%, 0603 TDK, C1608X7R1E104K 7 3 C15, C56, C62 CAP, 1nF, X7R, 50V,10%,0603 AVX, 06035C102KAT2A 8 1 C43 CAP, 68pF, NPO, 50V, 10%,0603 AVX, 06035A680KAT2A 9 1 C44 CAP, 4.7nF, X7R, 50V,10%,0603 AVX, 06035C472KAT2A 10 1 C49 CAP, 47pF X7R, 50V, 5%, 0603 AVX, 06035A470JAT2A 11 1 C53 CAP, 820pF X7R, 50V, 5%, 0603 AVX, 06035A821JAT2A 12 1 C54 CAP, 27nF, X7R, 50V,10%, 0603 AVX, 06035C273KAT2A 13 1 C61 CAP, 1µF, X5R, 25V, 20%, 0603 TDK, C1608X5R1E105M 14 2 C64, C81 CAP, 4.7µF X5R,10V, 20%, 0603 AVX, 0603ZD475MAT2A 15 1 L1 IND, 10µH COILCRAFT, SER1390-103ML 16 1 L2 IND, 15µH COILCRAFT, XAL1510-153MED 17 1 Q1 XSTR, N-CHANNEL MOSFET INFINEON, BSC123N08NS3G 18 1 Q2 XSTR, N-CHANNEL MOSFET INFINEON, BSC042NE7NS3G 19 1 Q21 XSTR, N-CHANNEL MOSFET INFINEON, BSC026N08NS5 20 1 Q22 XSTR, N-CHANNEL MOSFET INFINEON, BSC072N08NS5 21 1 R33 RES., 63.4kΩ,1/10W, 1%, 0603 VISHAY, CRCW060363K4FKEA 22 1 R35 RES., 4.99kΩ,1/10W, 1%, 0603 VISHAY, CRCW06034K99FKEA 23 2 R43, R78 RES., 332kΩ,1/10W, 1%, 0603 VISHAY, CRCW0603332KFKEA 24 2 R46, R48 RES., 100kΩ,1/10W, 5%, 0603 VISHAY, CRCW0603100KJNEA 25 1 R72 RES., 37.4kΩ,1/10W, 1%, 0603 VISHAY, CRCW060337K4FKEA 26 1 R75 RES., 3.6kΩ,1/10W, 1%, 0603 VISHAY, CRCW06033K60FKEA 27 1 R79 RES., 17.4kΩ,1/10W, 1%, 0603 VISHAY, CRCW060317K4FKEA 28 1 R81 RES., 100Ω,1/10W, 5%, 0603 VISHAY, CRCW0603100RJNEA 29 1 R86 RES., 2.2Ω,1/10W, 5%, 0603 VISHAY, CRCW06032R20JNEA 30 1 R92 RES., 90.9kΩ,1/10W, 1%, 0603 VISHAY, CRCW060390K9FKEA 31 1 RS1 RES., SENSE,0.008Ω,1/2W, 1%, 2010 VISHAY, WSL20108L000FEA18 32 1 RS2 RES., SENSE, 0.010Ω,1/2W, 1%, 2010 VISHAY, WSL201010L000FEA18 33 1 U1 IC, LOW IQ, 60V BOOST + BUCK SYNCHRONOUS CONTROLLER LINEAR TECH. LTC7813EUH#PBF Additional Demo Board Circuit Components 1 0 C1, C2, C3, CIN5, C6, C59, C68 CAP, OPTION, 1210 OPTION 2 0 C36 CAP, OPTION, 1206 OPTION 3 0 C7, C39, C40, C51, C66, C67, C73, C74, CAP, OPTION, 0805 C78, C79 OPTION 4 0 C55, C57, C60, C63, C65, C77 OPTION 10 CAP, OPTION, 0603 dc2435af DEMO MANUAL DC2435A-A/ DC2435A-B/DC2435A-C Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 5 0 D3 DIODE, OPTION, SMB OPTION 6 0 D4 DIODE, OPTION, SOD323 OPTION 7 0 L3 IND, OPTION OPTION 8 0 Q9, Q11, Q18, Q19 XSTR, OPTION, N-CHANNEL MOSFET OPTION 9 11 R34, R36, R39, R40, R70, R80, R95, R96, R103, R105, R108 RES., 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA 10 0 R37, R51, R53, R55, R62, R85, R89, R90, R91, R93, R94, R104, R106, R107, R109, R110, R111 RES., OPTION, 0603 OPTION 11 0 R82 RES., OPTION, 1206 OPTION 12 0 R100 RES., OPTION, 0805 OPTION 13 1 R101 RES., 0Ω, 2010 VISHAY, CRCW20100000Z0EF 14 0 R102 RES., OPTION, 2010 OPTION 15 0 RS3 RES., SENSE, OPT, 2010 OPTION Hardware: For Demo Board Only 1 14 E1-E14 TURRET MILL-MAX, 2501-2-00-80-00-00-07-0 2 2 JP1, JP2 CONN., HEADER, 1×3, 2mm WURTH ELEKTRONIK, 620-003-111-21 3 1 JP3 CONN., HEADER, 2×3, 2mm WURTH ELEKTRONIK, 620-006-211-21 4 3 XJP1, XJP2, XJP3 SHUNT, 2mm WURTH ELEKTRONIK, 608-002-134-21 5 6 J1, J2, J3, J4, J5, J6 JACK, BANANA KEYSTONE, 575-4 6 0 J9, J10 PAD NONE 7 4 STANDOFF, SNAP ON KEYSTONE, 8832 dc2435af 11 D C B A OFF ON E11 OFF ON E10 E12 E9 E8 JP2 3 2 1 RUN2 JP1 3 2 1 RUN1 0 R34 VIN VIN VOUT1 R37 OPT * 0 R36 R33 C60 OPT C77 OPT R111 OPT R110 OPT R46 100K INTVCC C49 47pF 1 2 VBUS R43 332K VIN 1. ALL RESISTORS AND CAPACITORS ARE 0603. NOTE: UNLESS OTHERWISE SPECIFIED RUN2 RUN1 PGOOD1 TRACK / SS1 FREQ CLKIN ASSY VOUT1 ‐A 24V/5A ‐B 28V ‐C 5V/8A * 332K R78 OPT * 820pF R35 68pF VBUS 28V 20V 24V 0 R108 C47 0.1uF 27nF C54 C53 C43 R107 OPT INTVCC 0 R70 C55 R72 37.4K R94 OPT INTVCC R33 11.5K 9.76K 63.4K 11 4 RUN2 17 R79 14.7K 21K 17.4K 3 14 23 3 20 5 19 6 RUN1 16 C52 0.1uF SS2 SS1 R75 3.6K ITH2 ITH1 C44 4.7nF * R79 VFB2 VFB1 9 10 JP3 R35 7.5K 7.5K 4.99K GND VPRG2 RUN2 RUN1 PGOOD1 SS2 TRK/SS1 ITH2 ITH1 VFB2 VFB1 FREQ BURST PS/SYNC FCM R80 0 1nF R81 100 OPT C63 BG2 TG2 SW2 BOOST2 EXTVCC SENSE1- SENSE1+ BG1 SW1 BOOST1 TG1 VBIAS DRVCC ILIM DRVUV DRVSET R48 100K INTVCC 4 4 R101 R102 RS2 L1 OPT 0 6m 22uH OPT 0 6m 22uH 0 OPT 10m 10uH C64 4.7uF C56 U1 LTC7813EUH 6 4 2 PLLIN/MODE 5 3 1 MODE INTVCC INTVCC 15 E7 PGND 33 3 SENSE2+ S2+ 12 2 SENSE213 S2- BOOST1 S1- 8 TG2 29 BG2 SW2 30 27 BOOST2 28 EXTVCC S1+ 7 25 BG1 31 1 32 INTVCC INTVCC R39 0 0 R95 4.7uF 0 R40 0 C21 0.1uF 5 R102 * 2010 OPT C57 VIN 6 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE LT DL PCB DES. 7 + TECHNOLOGY CIN4 4.7uF 100V 1210 VIN + CIN1 33uF 63V J2 J1 J6 VIN VIN+ GND GND E2 VIN- GND 4V -56V E1 E6 VBUS GND GND * VOUT1 VBUS E4 E5 + COUT2 100uF 63V J5 C36 OPT 1206 J4 VOUT1 * 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only CIN5 OPT 1210 33uF 63V COUT11 68uF 35V + COUT1 + J3 E3 SHT 2 DL APPROVED DATE: N/A SIZE 7 IC NO. 8 SHEET 1 LTC7813EUH DEMO CIRCUIT 2435A Thursday, December 10, 2015 2 OF 2 REV. WIDE INPUT SYNCHRONOUS STEP UP/DOWN SUPPLY TITLE: SCHEMATIC VBUS COUT5 68uF 35V COUT8 4.7uF 100V 1210 CIN3 4.7uF 100V 1210 COUT6 4.7uF 100V 1210 COUT4 2.2uF 100V 1206 VOUT1 VBUS_ BG2 TG2 BG1 S2- VL2- TG1 S2+ S1- VSW2 VL1- 12/10/15 DATE 8 S1+ SHT 2 PRODUCTION SHT 2 REVISION HISTORY DESCRIPTION VSW1 C78 OPT 0805 CIN2 4.7uF 100V 1210 C5 2.2uF 100V 1206 0.008 C6 OPT 1210 APPROVALS RS3 OPT 2 - C79 OPT 0805 REV ECO RS1 C59 OPT 1210 * VL1- RS2 C3 OPT 1210 L1 * C51 OPT 16V 0805 APP ENG. VL2- C2 OPT 1210 VSW1 15uH R82 OPT L2 CUSTOMER NOTICE VSW2 C1 OPT 1210 Q2 BSC042NE7NS C7 OPT 0805 * 2010 R101 VBUS 6 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. 4 4 4 Q1 BSC123N08NS Q22 BSC072N08NS 4 Q21 BSC026N08NS C4 0.1uF 1nF C15 INTVCC C81 R96 0.1uF C17 TG1 VBIAS R104 OPT R103 0 R106 OPT R105 0 R92 90.9k R109 OPT 2 26 24 18 21 22 C62 1nF INTVCC 5 5 6 7 8 1 2 3 5 6 7 8 1 2 3 5 6 7 8 1 2 3 5 6 7 8 12 1 2 3 1 D C B A DEMO MANUAL DC2435A-A/ DC2435A-B/DC2435A-C Schematic Diagram dc2435af VIN E13 C39 OPT 0805 SGND EXTVCC E14 C40 OPT 0805 R55 OPT EXTVCC C73 OPT 0805 VBUS C61 1uF OPT R93 2 C74 OPT 0805 D4 OPT S1- VSW1 1 VOUT1 SHT 1 SHT 1 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. VSW1 BG1 SHT 1 SHT 1 BG1 VSW1 TG1 4 4 Q19 OPT OPT R62 VIN VBUS S1- R53 OPT VL1- S1+ Q18 OPT VIN THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. L3 SCALE = NONE DL LT APPROVALS BG2 VSW2 TG2 OPT 4 Q9 OPT OPT R91 TECHNOLOGY 4 C67 OPT 0805 S2+ R90 OPT C68 OPT 1210 VL2- S2- D3 OPT GND VIN_EMI 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only Q11 OPT VBUS J10 J9 VL2- SHT 1 S2- SHT 1 DATE: N/A SIZE IC NO. Thursday, December 10, 2015 SHEET 2 LTC7813EUH DEMO CIRCUIT 2435A 2 OF 2 REV. WIDE INPUT SYNCHRONOUS STEP UP/DOWN SUPPLY TITLE: SCHEMATIC BG2 VSW2 SHT 1 OPT 0805 TG2 SHT 1 OPT R89 OPT C65 R100 VSW2 SHT 1 C66 OPT 0805 SHT 1 S2+ SHT 1 VSW2 C80 4.7uF 100V 1210 VL1- SHT 1 S1+ SHT 1 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. CUSTOMER NOTICE TG1 SHT 1 SHT 1 2.2 OPT R86 R85 VBUS_ OPT R51 VBIAS VSW1 WHEN DCR SENSING IS IMPLEMENTED,SHORT RS1 & RS2. REMOVE R30, R29, R80 & R81.STUFF R62 AND R91 WITH 0 OHMS. CALCULATE R51, R53 & C15 AND R89, R90 & C56 PER THE DATA SHEET. ALSO REFER TO QSG FOR EXAMPLE. NOTE: 5 6 7 8 1 2 3 5 6 7 8 1 2 3 5 6 7 8 1 2 3 5 6 7 8 1 2 3 1 2 OPTIONAL DCR SENSING DEMO MANUAL DC2435A-A/ DC2435A-B/DC2435A-C Schematic Diagram dc2435af 13 DEMO MANUAL DC2435A-A/ DC2435A-B/DC2435A-C 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 dc2435af LT 0516 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2016