DEMO MANUAL DC1830B-C/DC1830B-D LTC4000-1 Battery Charger Controller and PowerPath Manager with Maximum Power Point Control DESCRIPTION Demonstration circuit 1830B is a battery charger controller and PowerPath™ manager with maximum power point control (MPPC) featuring the LTC®4000-1. MPPC extracts near maximum power from high impedance sources such as solar panels, wind turbines or fuel cells. MPPC is achieved by means of an input voltage regulation control loop. This board should be connected to a front-end DC/DC power supply for a complete charger solution. The DC1830B is customizable to handle a wide variety of applications with output voltages from 3V to 30V and output currents up to 6.5A with the PFETs supplied, and up to 60V and/or 13A with higher voltage rating and/or added PFETs. The reference design provided with DC1830B is targeted at 4-cell LiFePO4 (14.6V/5A) applications. The DC1830B loop compensation values were proven with the LTC3845A buck power converter shown and are typical for other applications. The output of this demo board was specifically tailored for a Tenergy 10A-hour battery, P/N 30207. Other voltages can be set by changing ROFB2 and RBFB2. The desired nominal voltage can be accurately trimmed by using trim resistors ROFBX and RBFBX. For example, for 14.4V battery float voltage, change ROFB2 and RBFB2 to 86.6k, and add 7.5M at ROFBX and RBFBX for greater setpoint accuracy. Other parameters can be adjusted to suit specific applications with guidance provided in the LTC4000-1 data sheet. Table 1 provides a summary of parameter adjustments. This circuit was designed to demonstrate the high levels of performance and small solution size attainable using this part to control a switch mode power converter to form a battery charger, intelligent PowerPath manager and power supply system. It produces a regulated 5.0A/14.6V battery charger output as well as a system output of up to 5.5A: suitable for a wide variety of portable applications including instruments, industrial equipment, power tools and computers. The DC1830B-C provides a solution complete with both battery charger control and PowerPath management. It includes a second PFET (Q2) between VOUT-SYS and BAT to provide “instant-on” functionality which keeps VOUT-SYS within a narrow range regardless of battery voltage, and disconnects the battery when it is fully charged and power is available from the front-end DC/DC converter. Thermal regulation circuitry is also provided to limit the temperature of both PFETs. The DC1830B-D provides a simple battery-charger-controller-only solution without the PowerPath manager. It deletes the second PFET and thermal regulation circuitry. In this case, the battery is always “online” and VOUT-SYS tracks the BAT voltage. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. dc1830b-c/b-df 1 DEMO MANUAL DC1830B-C/DC1830B-D PERMORMANCE SUMMARY Specifications are at TA = 25°C SYMBOL PARAMETER CONDITIONS/COMMENTS VIN Input Supply Range This Is the Input Voltage of the Front-End DC/DC Supply VIN-MP Input Regulation Voltage This Is the Input Voltage Lower Limit Set by the LTC4000-1 VFLOAT Battery Float Voltage Output Regulation IBAT MIN TYP 20 MAX 60 V 14.8 V 35.1 14.4 V 0 % Battery Charge Current 5.0 A Battery Charge Current – Trickle 0.6 A tT Charge Termination Time VOUT-SYS System Output Voltage IOUT-SYS System Output Current Range Line and Load (20V to 60V, 0A to 4.5A) 14.6 UNITS VBAT = VFLOAT 2.9 12.3 0 14.6 Hours 15.5 V 5.5 A QUICK START PROCEDURE Demonstration circuit 1830 is offered for use in combination with a front-end DC/DC converter, and will need to be customized to suit the intended application. It has been supplied with components for a design as outlined in the Performance Summary, and tested in conjunction with the LTC3845A buck converter that it was tailored to. A separate demonstration board is available for the LTC4000-1/LTC3789 buck-boost combination, the DC1721B. The LTC4000-1 data sheet should be used for guidance in determining circuit values for the application at hand. You may follow the Design Example on page 26 of the data sheet. Table 1 provides a summary of parameter adjustments. 2. With power off, connect the supply to the input terminals VIN and GND. NOTE: The PFETs supplied on this board are rated at 30V. 3. Set CHARGE jumper to ENABLE. Once the circuit has been customized to suit the application at hand, it is easy to set up to evaluate the performance of the LTC4000-1 when combined with a suitable switching power converter, such as the LTC3845A. Voltages and currents cited in this procedure are for the design as delivered; if the design has been customized, substitute the appropriate values. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: 4. Turn on the power at the input. WARNING: BATTERIES ARE POTENTIALLY DANGEROUS HIGH ENERGY SOURCES. IMPROPER CONNECTION, OVERCHARGE, OR RAPID DISCHARGE COULD RESULT IN EXPLOSION AND/OR FIRE. NOTE: a. Input voltages lower than 20V can keep the converter from turning on due to the undervoltage lockout feature of the LTC4000-1. b. Input voltages lower than the MPPC regulation point (35.1V) will reduce the associated DC/DC converter’s output to a minimum. c. If efficiency measurements are desired, refer to Figure 1 for the test setup. NOTE: Make sure that the input voltage never exceeds 60V. 5. Check for the proper BAT output voltage of 14.6V. Turn off the power at the input. 6. Now that the proper output voltage is established, connect a variable load capable of sinking 6A at 16V to the output terminals BAT and GND. Set the current for 0A. 7. Turn on the power at the input. NOTE: If there is no output, temporarily disconnect the load to make sure that the load is not set too high. 1. Set an input power supply that is capable of 60V and 3A, to 36V. Then turn off the supply. dc1830b-c/b-df 2 DEMO MANUAL DC1830B-C/DC1830B-D QUICK START PROCEDURE 8. Once the proper BAT output voltage is again established, adjust the load and/or source within the operating range and observe the battery float voltage regulation, charge current, and other desired parameters. 9. Set the load to constant voltage mode to more easily observe charge current and trickle charge current. 10. In order to observe MPPC operation, add a 4.7Ω or 5Ω, 10W resistor in series with the DC source and set the source to 40V. Use a constant voltage or constant resistance load characteristic. As the load is increased, the input voltage will be regulated at the MPPC regulation point (35.1V) by reducing the output of the DC/DC converter. NOTE: Operation in the instant-on region (VOUT < 12.5V) may engage thermal limit circuit to protect Q2 in the linear region. NOTE: The optional thermal limit circuit for Q1 (Q5, RNTC3, R8-R12, and U2) is included to protect Q1 in case of an extended short circuit on VOUT-SYS under adverse thermal conditions (TA > 40°C). It may not be needed in applications with less severe thermal conditions, lower current available to VOUT-SYS, or where continuous short circuit protection on VOUT-SYS is not required. NOTE: The following applies to the DC1830B-C. 11. Turn off the power at the input. 12. Connect the output load and meters to the VOUT-SYS output. 13. Set CHARGE jumper to DISABLE. 14. Turn on the power at the input. 15. Once the proper VOUT-SYS is again established, adjust the load and/or source within the operating range and observe the output voltage regulation, ripple voltage, efficiency, output current limit and other desired parameters. Table 1. LTC4000-1 Charger Setup Parameters and Reference Values REFERENCE DESCRIPTION VIN Input Voltage Regulation/Limit NOMINAL VALUE (V)* MIN/MAX 1.000V 0.985/1.010 ICL Charge Current Regulation/Limit (50μA • RCL)/20 45/55 ICL Trickle Charge Current Regulation/Limit (50μA • RCL)/20 4.5/5.5 VBAT-FLOAT Battery Float Voltage 1.136V 1.125/1.147 VOUT System Voltage 1.193V 1.181/1.204 (Follows VBAT) Input Voltage Monitor/UVLO CX C/X Monitor/Charge Termination TMR Charge Termination Timer 50mV Max Charger Off Charger Float (Follows VBAT) VM CONDITIONS Charging at ICL, 0.86 • VBAT-FLOAT < VBAT < VBAT-FLOAT 0.86 • 1.136V 0.82/0.90 Instant-On, 0.68 • VBAT-FLOAT < VBAT < 0.86 • VBAT-FLOAT 0.86 • 1.136V 0.82/0.90 Instant-On, Trickle, VBAT < 0.68 • VBAT-FLOAT 1.193V 1.181/1.204 (5μA • RCX – 10mV)/20 4.5/5.5 104s/nF 83/126 Falling, (40mV Hysteresis) Short TMR to BIAS for C/X Termination *Normalized to sense point. dc1830b-c/b-df 3 DEMO MANUAL DC1830B-C/DC1830B-D QUICK START PROCEDURE OR – – DC SOURCE + V + + + V SCOPE – + A A – + LOAD – – Figure 1. Fixture Connections and Measurement Equipment Setup Figure 2. Block Diagram with Typical DC/DC Converter dc1830b-c/b-df 4 DEMO MANUAL DC1830B-C/DC1830B-D PARTS LIST—DC1830B-C ITEM QTY REFERENCE Required Circuit Components 1 1 C1 2 1 CBAT 3 1 CBIAS 4 1 CBGATE 5 2 CC2, CTMR 6 2 CIIMON, CIBMON 7 1 CIN 8 2 COUT, CL 9 1 D1 10 1 D2 11 2 D3, D4 12 1 F2 13 2 Q1, Q2 14 2 Q5, Q6 15 2 RBFB2, ROFB2 16 4 RBFB1, ROFB1, R12, R17 17 1 RC1 18 1 RCL 19 1 RCS 20 3 RCX, R8, R13 21 1 RIFB1 22 1 RIL 23 2 RNTC2, RNTC3 24 1 RIS1 25 1 RVM1 26 1 RVM2 27 1 R5 28 3 R4, R7, R19 29 2 R6, R18 30 1 R9 31 2 R10, R15 32 2 R11, R16 33 1 R14 34 1 U1 35 2 U2, U3 Additional Demo Board Circuit Components 1 0 CC1, CIGATE, CNTC, CCX, CCL, CIL, CVM 2 0 CL1, CL2, CL3, CL4, CL5 3 0 F1, F3 4 0 Q3, Q4 5 0 R1, R2, R3, R20, R21, RIG, RBG, RBFBX, RBFB3, ROFBX PART DESCRIPTION MANUFACTURER/PART NUMBER CAP., X5R, 4.7μF, 10V, 20% 0603 CAP., SMT ALUMINUM, 150μF, 35V CAP., X7R, 1μF, 16V, 10% 0603 CAP., X7R, 10nF, 50V, 5% 0603 CAP., X7R, 0.1μF, 50V, 10% 0603 CAP., C0G, 1000pF, 25V, 5% 0603 CAP., X7R, 1μF, 50V, 10% 1210 CAP., X7R, 2.2μF, 50V, 10% 1206 DIODE ZENER 3.0V 200MW SOD-323 LED, GREEN, SMT, 0603 LED 660NM SUPER RED DIFF 0603 SMD FUSE 12A 32V T-LAG 1206 SMD MOSFET P-CHAN., 30V, POWERPAK-8 SMALL SIGNAL MOSFET RES., CHIP, 84.5k, 0.1W, 1% 0603 RES., CHIP, 1M, 0.1W, 1% 0603 RES., CHIP, 4.22k, 1/10W 1% 0603 RES., CHIP, 24.3k, 0.1W, 1% 0603 SENSOR RES., 0.01Ω 1W 2% 1508 SMD RES., CHIP, 10k, 0.1W, 1% 0603 RES., CHIP, 68.1k, 0.1W, 1% 0603 RES., CHIP, 2.0k, 0.1W, 1% 0603 THERMISTOR NTC 10kΩ 5% 0603 SENSOR RES 0.015Ω 1W 2% 1508 SMD RES., CHIP, 35.7k, 1/10W 1% 0603 RES., CHIP, 2.49k, 1/10W 1% 0603 RES., CHIP, 2.2k, 0.1W, 5% 0603 RES., CHIP, 100k, 0.1W, 5% 0603 RES., CHIP, 4.7k, 0.1W, 5% 0603 RES., CHIP, 46.4k, 0.1W, 1% 0603 RES., CHIP, 20k, 0.1W, 1% 0603 RES., CHIP, 38.3k, 0.1W, 1% 0603 RES., CHIP, 78.7k, 0.1W, 1% 0603 I.C. LTC4000EUFD-1, 28-PIN QFN NANOPWR COMPARATOR, MSOP8 AVX, 0603ZD475MAT2A SUNCON, 35HVP150M AVX, 0603YC105KAT2A MURATA, GRM188R71H103JA01D AVX, 06035C104KAT2A AVX, 06033A102JAT2A AVX, 12105C105KAT2A MURATA, GRM31CR71H225KA88L DIODE INC.,BZT52C3V0S-7-F LITE-ON, LTST-C190KGKT LUMEX, SML-LX0603SRW-TR COOPER BUSSMAN, 3216TD12-R VISHAY, SI7135DP-T1-GE3 ON SEMI., 2N7002LT1G VISHAY, CRCW060384K5FKEA VISHAY, CRCW06031M00FKEA YAGEO, RT0603FRE074K22L VISHAY, CRCW060324K3FKEA SUSUMU, RL3720WT-R010-G YAGEO, RC0603FR-0710KL VISHAY, CRCW060368K1FKEA VISHAY, CRCW06032K00FKTA VISHAY, NTHS0603N02N1002J SUSUMU, RL3720WT-R015-G VISHAY, CRCW060335K7FKEA YAGEO, RC0603FR-072K49L VISHAY, CRCW06032K2JKEA VISHAY, CRCW0603100KJKEA VISHAY, CRCW06034K7JKEA VISHAY, CRCW060346K4FKEA VISHAY, CRCW060320K0FKEA VISHAY, CRCW060338K3FKEA VISHAY, CRCW060378K7FKEA LINEAR TECH., LTC4000EUFD-1#PBF LINEAR TECH., LTC1540CMS8#PBF CAP., 0603 OPT CAP., 1206, 50V OPT FUSE 12A 32V T-LAG 1206 SMD OPT MOSFET P-CHAN., 30V, POWERPAK-8 OPT RES., 0603 OPT dc1830b-c/b-df 5 DEMO MANUAL DC1830B-C/DC1830B-D PARTS LIST—DC1830B-C ITEM QTY REFERENCE Hardware-For Demo Board Only 1 16 E1-E6, E9-E14, E18, E19, E20, E21 2 5 E7, E8, E15, E16, E17 3 4 JP1, JP2, JP3, JP4 4 4 XJP1, XJP2, XJP3, XJP4 5 9 J1, J2, J3, J4, J5, J6, J7, J8, J9 6 4 MTG1, MTG2, MTG3, MTG4 PART DESCRIPTION MANUFACTURER/PART NUMBER TESTPOINT, TURRET, 0.061" PBF TESTPOINT, TURRET, 0.094" PBF HEADER, 3-PIN 0.079 SINGLE ROW SHUNT, 0.079" CENTER CONNECTOR, BANANA JACK STAND-OFF, NYLON (SNAP ON), 0.50" TALL MILL-MAX, 2308-2-00-80-00-00-07-0 MILL-MAX, 2501-2-00-80-00-00-07-0 SAMTEC, TMM-103-02-L-S SAMTEC, 2SN-BK-G KEYSTONE, 575-4 KEYSTONE, 8833(SNAP ON) PART DESCRIPTION MANUFACTURER/PART NUMBER CAP., X5R, 4.7μF, 10V, 20% 0603 CAP., SMT ALUMINUM, 150μF, 35V CAP., X7R, 1μF, 16V, 10% 0603 CAP., X7R, 0.1μF, 50V, 10% 0603 CAP., C0G, 1000pF, 25V, 5% 0603 CAP., X7R, 2.2μF, 50V, 10% 1206 CAP., X7R, 1μF, 50V, 10% 1210 DIODE ZENER 3.0V 200MW SOD-323 LED 660NM SUPER RED DIFF 0603 SMD LED, GREEN, SMT, 0603 FUSE 12A 32V T-LAG 1206 SMD MOSFET P-CHAN., 30V, POWERPAK-8 RES., CHIP, 1M, 0.1W, 1% 0603 RES., CHIP, 84.5k, 0.1W, 1% 0603 RES., CHIP, 4.22k, 1/10W 1% 0603 RES., CHIP, 24.3k, 0.1W, 1% 0603 SENSOR RES., 0.01Ω, 1W 2% 1508 SMD RES., CHIP, 0.0Ω, 0.1W, 0603 RES., CHIP, 68.1k, 0.1W, 1% 0603 RES., CHIP, 2.0k, 0.1W, 1% 0603 SENSOR RES 0.015Ω, 1W 2% 1508 SMD RES., CHIP, 35.7k, 1/10W 1% 0603 RES., CHIP, 2.49k 1/10W 1% 0603 RES., CHIP, 100k, 0.1W, 5% 0603 RES., CHIP, 2.2k, 0.1W, 5%, 0603 RES., CHIP, 4.7k, 0.1W, 5% 0603 ZERO OHM THICK FILM JUMPER CHIP, 2010 I.C., LTC4000EUFD-1, 28PIN QFN AVX, 0603ZD475MAT2A SUNCON, 35HVP150M AVX, 0603YC105KAT2A AVX, 06035C104KAT2A AVX, 06033A102JAT2A MURATA, GRM31CR71H225KA88L AVX, 12105C105KAT2A DIODE INC.,BZT52C3V0S-7-F LUMEX, SML-LX0603SRW-TR LITE-ON, LTST-C190KGKT COOPER BUSSMAN, 3216TD12-R VISHAY, SI7135DP-T1-GE3 VISHAY, CRCW06031M00FKEA VISHAY, CRCW060384K5FKEA YAGEO, RT0603FRE074K22L VISHAY, CRCW060324K3FKEA SUSUMU, RL3720WT-R010-G VISHAY, CRCW06030000Z0EA VISHAY, CRCW060368K1FKEA VISHAY, CRCW06032K00FKTA SUSUMU, RL3720WT-R015-G VISHAY, CRCW060335K7FKEA YAGEO, RC0603FR-072K49L VISHAY, CRCW0603100KJKEA VISHAY, CRCW06032K2JKEA VISHAY, CRCW06034K7JKEA IRC., LRC-LRZ-2010LF-R000 LINEAR TECH., LTC4000EUFD-1#PBF PARTS LIST—DC1830B-D ITEM QTY REFERENCE Required Circuit Components 1 1 C1 2 1 CBAT 3 1 CBIAS 4 2 CC2, CTMR 5 2 CIIMON, CIBMON 6 1 COUT 7 1 CIN 8 1 D1 9 2 D2,D3 10 1 D4 11 1 F2 12 1 Q1 13 2 RBFB1, ROFB1 14 1 RBFB2 15 1 RC1 16 1 RCL 17 1 RCS 18 2 RCX, R21 19 1 RIFB1 20 1 RIL 21 1 RIS1 22 1 RVM1 23 1 RVM2 24 3 R4, R7, R19 25 1 R5 26 2 R6,R18 27 1 R22 28 1 U1 dc1830b-c/b-df 6 DEMO MANUAL DC1830B-C/DC1830B-D PARTS LIST—DC1830B-D ITEM QTY REFERENCE Additional Demo Board Circuit Components 1 0 CC1, CBGATE, CIGATE, CNTC, CCX, CCL, CIL, CVM 2 0 CL, CL1, CL2, CL3, CL4, CL5 3 0 F1, F3 4 0 RNTC2, RNTC3 5 0 R1, R2, R3, R20, RIG, RBG, RBFBX, ROFBX, RBFB3, ROFB2 6 0 R8, R13 7 0 R9 8 0 R10, R15 9 0 R11, R16 10 0 R12, R17 11 0 R14 12 0 Q3,Q4 13 0 Q5,Q6 14 0 U2,U3 Hardware-For Demo Board Only 1 16 E1-E6, E9-E14, E18, E19, E20, E21 2 5 E7, E8, E15, E16, E17 3 4 JP1, JP2, JP3, JP4 4 4 XJP1, XJP2, XJP3, XJP4 5 9 J1, J2, J3, J4, J5, J6, J7, J8, J9 6 4 MTG1, MTG2, MTG3, MTG4 PART DESCRIPTION MANUFACTURER/PART NUMBER CAP., 0603 OPT CAP.,1206, 50V OPT FUSE 12A 32V T-LAG 1206 SMD OPT THERMISTOR NTC 10kΩ 5% 0603 OPT RES., 0603 OPT VISHAY, NTHS0603N02N1002J RES., CHIP, 10k, 0.1W, 1% 0603 OPT RES., CHIP, 46.4k, 0.1W, 1% 0603 OPT RES., CHIP, 20k, 0.1W, 1% 0603 OPT RES., CHIP, 38.3k, 0.1W, 1% 0603 OPT RES., CHIP, 1M, 0.1W, 1% 0603 OPT RES., CHIP, 78.7k, 0.1W, 1% 0603 OPT MOSFET P-CHAN., 30V, POWERPAK-8 OPT SMALL SIGNAL MOSFET OPT NANOPWR COMPARATOR, MSOP8 OPT YAGEO, RC0603FR-0710KL VISHAY, CRCW060346K4FKEA VISHAY, CRCW060320K0FKEA VISHAY, CRCW060338K3FKEA VISHAY, CRCW06031M00FKEA VISHAY, CRCW060378K7FKEA ON SEMI., 2N7002LT1G LINEAR TECH., LTC1540CMS8#PBF TESTPOINT, TURRET, 0.061" PBF TESTPOINT, TURRET, 0.094" PBF HEADER, 3-PIN 0.079 SINGLE ROW SHUNT, 0.079" CENTER CONNECTOR, BANANA JACK STAND-OFF, NYLON (SNAP ON), 0.50" TALL MILL-MAX, 2308-2-00-80-00-00-07-0 MILL-MAX, 2501-2-00-80-00-00-07-0 SAMTEC, TMM-103-02-L-S SAMTEC, 2SN-BK-G KEYSTONE, 575-4 KEYSTONE, 8833(SNAP ON) dc1830b-c/b-df 7 DEMO MANUAL DC1830B-C/DC1830B-D SCHEMATIC DIAGRAM dc1830b-c/b-df 8 DEMO MANUAL DC1830B-C/DC1830B-D SCHEMATIC DIAGRAM Modifed DC1619A as used with DC1830B dc1830b-c/b-df 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. 9 DEMO MANUAL DC1830B-C/DC1830B-D 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 dc1830b-c/b-df 10 Linear Technology Corporation LT 1012 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2012