Linear Technology DC1830A-A Quick setup guide

dc1830af

DEMO MANUAL

DC1830A-A/DC1830A-B

DESCRIPTION

LTC4000

Battery Charger Controller

and PowerPath Manager

Demonstrationcircuit1830Aisabatterychargercontroller

and PowerPath™ manager featuring the LTC

4000. This

board should be connected to a front-end DC/DC power

supply for a complete charger solution.

The DC1830A 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 DC1830A is

targeted at 4-cell LiFePO4(14.6V/5A) applications.

The DC1830A loop compensation values were proven with

the LTC3845A buck power converter shown and are typi-

cal 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 ad-

justed to suit specific applications with guidance provided

in the LTC4000 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

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.

PERFORMANCE SUMMARY

this IC 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 DC1830A-A provides a solution complete with both

battery charger control and PowerPath managment. 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 thebattery when it isfullycharged

andpowerisavailablefromthefront-end DC/DC converter.

Thermal regulation circuitry is also provided to limit the

temperature of both PFETs. The DC1830A-B 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

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS/COMMENTS MIN TYP MAX UNITS

VIN Input Supply Range This Is the Input Voltage of the Front-End DC/DC Supply 20 60 V

IIN Input Current Limit This Is the Input Current Limit Set by the LTC4000 3.0 A

VFLOAT Battery Float Voltage 14.4 14.6 14.8 V

VFLOAT Output Regulation Line and Load (20V to 60V, 0A to 4.5A) ±0.005 %

IBAT Battery Charge Current 5.0 A

Battery Charge Current—Trickle 0.6 A

tTCharge Termination Time VBAT = VFLOAT 2.9 Hours

VOUT-SYS System Output Voltage 12.3 14.6 15.5 V

IOUT-SYS System Output Current Range *Input Current Limited Below 35VIN 0 5.5* A

dc1830af

DEMO MANUAL

DC1830A-A/DC1830A-B

QUICK START PROCEDURE

Demonstration circuit 1830 is offered for use in com-

bination 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/LTC3789 buck-boostcombination, theDC1721A.

The LTC4000 data sheet should be used for guidance in

determining circuit values for the application at hand. You

may follow the designexample on page26 of the datasheet.

Table 1 provides a summary of parameter adjustments.

NOTE: The PFETs supplied on this board are rated at 30V.

Oncethecircuithas been customized to suit the application

at hand, it is easy to set up to evaluate the performance

of the LTC4000 when combined with a suitable switching

power converter, such as the LTC3845A. See page 9 for

the modified DC1619A/LTC3845A schematic.Voltages

and currents cited in this procedure are for the design as

delivered;ifthedesignhas been customized, substitute the

appropriate values. Refer to Figure 1 for proper measure-

ment equipment setup and follow the procedure below:

Warning: Batteries Are Potentially Dangerous High Energy

Sources. Improper Connection, Overcharge, or Rapid

Discharge Could Result in Explosion and/or Fire.

1. Set an input power supply that is capable of 60V and

3A, to 24V. Then turn off the supply.

2. With power off, connect the supply to the input ter-

minals VIN and GND.

NOTE:

a. Input voltages lowerthan 20Vcan keep theconverter

from turning on due to the undervoltage lockout

feature of the LTC4000.

b. If efficiency measurements are desired, refer to

Figure 1 for the test setup.

3. Set CHARGE jumper to ENABLE.

4. Turn on the power at the input.

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.

8. Once the proper BAT output voltage is again estab-

lished, adjust the load and/or source within the operat-

ing range and observe the battery float voltage regula-

tion, charge current, and other desired parameters.

9. Set the load to constant voltage mode to more easily

observe charge current and trickle charge current.

NOTE: The following applies to the DC1830A-A.

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, R8-12 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.

10. Turn off the power at the input.

11. Connect the output load and meters to the VOUT-SYS

output.

12. Set CHARGE jumper to DISABLE.

13. Turn on the power at the input.

14. Oncethe proper VOUT-SYS is againestablished,adjust

the load and/or source within the operating range and

observe the output voltage regulation, ripple voltage,

efficiency, input and output current limit, and other

desired parameters.

dc1830af

DEMO MANUAL

DC1830A-A/DC1830A-B

QUICK START PROCEDURE

Table 1. LTC4000 Charger Setup Parameters and Reference Values

REFERENCE DESCRIPTION NOMINAL VALUE (V)* MIN/MAX CONDITIONS

IIL Input Current Regulation/Limit (50μA • RIL)/20 45μA/55μA 50mV Max

ICL Charge Current Regulation/Limit (50μA • RCL)/20 45μA/55μA 50mV Max

Trickle Charge Current Regulation/Limit (5μA • RCL)/20 4.5μA/5.5μA 50mV Max

VBAT-FLOAT Battery Float Voltage 1.136V 1.125V/1.147V

VOUT System Voltage 1.193V 1.181V/1.204V Charger Off

(Follows VBAT) Charger Float

(Follows VBAT) 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

VM Input Voltage Monitor/UVLO 1.193V 1.181V/1.204V Falling, (40mV Hysteresis)

CX C/X Monitor/Charge Termination (5μA • RCX – 10mV)/20 4.5μA/5.5μA Short TMR to BIAS for C/X

Termination

TMR Charge Termination Timer 104s/nF 83s/nF/126s/nF

*Normalized to sense point

–

SCOPE

–+

–

LOAD

–+

SOURCE

Figure 1. Fixture Connections and Measurement Equipment Setup

dc1830af

DEMO MANUAL

DC1830A-A/DC1830A-B

QUICK START PROCEDURE

Figure 2. Block Diagram with Typical DC/DC Converter

dc1830af

DEMO MANUAL

DC1830A-A/DC1830A-B

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC1380A-A Required Circuit Components

1 1 C1 CAP., X5R, 4.7μF, 10V, 20% 0603 AVX, 0603ZD475MAT2A

2 1 CBAT CAP., SMT ALUMINUM, 150μF, 35V SUNCON, 35HVH150M

3 1 CBIAS CAP., X7R, 1μF, 16V, 10% 0603 AVX, 0603YC105KAT2A

4 1 CBGATE CAP., X7R, 10nF, 25V, 5% 0603 AVX, 06033C103JAT2A

5 2 CC2, CTMR CAP., X7R, 0.1μF, 50V, 10% 0603 AVX, 06035C104KAT2A

6 2 CIIMON, CIBMON CAP., C0G, 1000pF, 25V, 5% 0603 AVX, 06033A102JAT2A

7 1 CIN CAP., X7R, 1μF, 50V, 10% 1210 AVX, 12105C105KAT2A

8 1 CL CAP., X7R, 2.2μF, 50V, 10% 1206 MURATA, GRM31CR71H225KA88L

9 1 D1 DIODE ZENER 3.0V 350MW SOT23-3 DIODE INC., BZX84C3V0-7-F

10 2 D3, D5 LED, RED HI BRT SS TYPE LO CUR SMT, 0603 PANASONIC, LNJ208R8ARA

11 1 D4 LED, GREEN, SMT, 0603 LITE-ON, LTST-C190KGKT

12 1 F2 FUSE 12A 32V T-LAG 1206 SMD COOPER BUSSMAN, 3216TD12-R

13 2 Q1, Q2 MOSFET P-CHAN., 30V, POWERPAK-8 VISHAY, SI7135DP-T1-GE3

14 2 Q5, Q6 SMALL-SIGNAL MOSFET ON SEMI., 2N7002LT1G

15 1 R5 RES., CHIP., 2.2k, 0.1W, 5% 0603 VISHAY, CRCW06032K2JKEA

16 2 R6, R18 RES., CHIP., 4.7k, 0.1W, 5% 0603 VISHAY, CRCW06034K7JKEA

17 4 R8, R13, RCX, RVM2 RES., CHIP., 10k, 0.1W, 1% 0603 YAGEO, RC0603FR-0710KL

18 1 R9 RES., CHIP., 46.4k, 0.1W, 1% 0603 VISHAY, CRCW060346K4FKEA

19 2 R10, R15 RES., CHIP., 20k, 0.1W, 1% 0603 VISHAY, CRCW060320K0FKEA

20 2 R11, R16 RES., CHIP., 38.3k, 0.1W, 1% 0603 VISHAY, CRCW060338K3FKEA

21 2 R12, R17 RES., CHIP., 1M, 0.1W, 1% 0603 VISHAY, CRCW06031M00FKEA

22 1 R14 RES., CHIP., 78.7k, 0.1W, 1% 0603 VISHAY, CRCW060378K7FKEA

23 2 RBFB1, ROFB1 RES., CHIP., 1M, 0.1W, 1% 0603 VISHAY, CRCW06031M00FKEA

24 2 RBFB2, ROFB2 RES., CHIP., 84.5k, 0.1W, 1% 0603 VISHAY, CRCW060384K5FKEA

25 1 RC1 RES., CHIP., 4.22k, 0.1W, 1% 0603 YAGEO, RC0603FR-07422KL

26 1 RCL RES., CHIP., 24.3k, 0.1W, 1% 0603 VISHAY, CRCW060324K3FKEA

27 1 RIL RES., CHIP., 18.2K, 0.1W, 1% 0603 VISHAY, CRCW060318K2FKEA

28 1 RCS SENSOR RES., 0.01Ω 1W 2% 1508 SMD SUSUMU, RL3720WT-R010-G

29 1 RIS1 SENSOR RES., 0.015Ω 1W 2% 1508 SMD SUSUMU, RL3720WT-R015-G

30 2 RNTC2, RNTC3 THERMISTOR NTC 10k 5% 0603 VISHAY, NTHS0603N02N1002J

31 1 RVM1 RES., CHIP., 143k, 0.1W, 1% 0603 VISHAY, CRCW0603143KFKEA

32 3 R4, R7, R19 RES., CHIP., 100k, 0.1W, 5% 0603 VISHAY, CRCW0603100KJKEA

33 1 U1 I.C., LTC4000EUFD, 28-PIN QFN LINEAR TECH., LTC4000EUFD#PBF

34 2 U2, U3 NANOPWR COMPARATOR, MSOP8 LINEAR TECH., LTC1540CMS8#PBF

dc1830af

DEMO MANUAL

DC1830A-A/DC1830A-B

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC1380A-A Additional Demo Board Circuit Components

1 0 CC1, CIGATE, CNTC, CCX, CCL, CIL, CVM CAP.,0603 OPT

2 0 CL1, CL2, CL3, CL4, CL5 CAP.,1206 OPT

3 0 D2 DIODE ZENER, SOT23-3 OPT

4 0 F1, F3 FUSE 12A 32V T-LAG 1206 SMD OPT

5 0 JUMPER JUMPER WIRE (NO INSTALL)

6 0 Q3 MOSFET P-CHAN., 30V, POWERPAK-8 OPT

70Q4 OPT

8 0 R1, R2, R3, R20, RCL, RIG, RBG, RBFBX,

ROFBX, ROFB2

RES., 0603 OPT

DC1380A-A Hardware—For Demo Board Only

1 14 E1-E6, E9-E14, E18, E19 TESTPOINT, TURRET, 0.061" PBF MILL-MAX, 2308-2-00-80-00-00-07-0

2 5 E7, E8, E15, E16, E17 TESTPOINT, TURRET, 0.094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0

3 4 JP1, JP2, JP3, JP4 HEADER, 3-PIN 0.079 SINGLE ROW SAMTEC, TMM-103-02-L-S

4 4 XJP1, XJP2, XJP3, XJP4 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

5 9 J1, J2, J3, J4, J5, J6, J7, J8, J9 CONNECTOR, BANANA JACK KEYSTONE, 575-4

6 4 MTG1, MTG2, MTG3, MTG4 STAND-OFF, NYLON (SNAP ON), 0.50" TALL KEYSTONE, 8833(SNAP ON)

DC1380A-B Required Circuit Components

1 1 C1 CAP., X5R, 4.7μF, 10V, 20% 0603 AVX, 0603ZD475MAT2A

2 1 CBAT CAP., SMT ALUMINUM, 150μF, 35V SUNCON, 35HVH150M

3 1 CBIAS CAP., X7R, 1μF, 16V, 10% 0603 AVX, 0603YC105KAT2A

4 2 CC2, CTMR CAP., X7R, 0.1μF, 50V, 10% 0603 AVX, 06035C104KAT2A

5 2 CIIMON, CIBMON CAP., C0G, 1000pF, 25V, 5% 0603 AVX, 06033A102JAT2A

6 1 CIN CAP., X7R, 1μF, 50V, 10% 1210 AVX, 12105C105KAT2A

7 1 D1 DIODE ZENER 3.0V 350MW SOT23-3 DIODE INC., BZX84C3V0-7-F

8 2 D3, D5 LED, RED HI BRT SS TYPE LO CUR SMT, 0603 PANASONIC, LNJ208R8ARA

9 1 D4 LED, GREEN, SMT, 0603 LITE-ON, LTST-C190KGKT

10 1 F2 FUSE 12A 32V T-LAG 1206 SMD COOPER BUSSMAN, 3216TD12-R

11 1 JUMPER JUMPER WIRE (INSTALLED)

12 1 Q1 MOSFET P-CHAN., 30V, POWERPAK-8 VISHAY, SI7135DP-T1-GE3

13 1 Q2 ZERO OHM THICK FILM JUMPER CHIP, 2010 IRC., LRC-LRZ-2010LF-R000

14 1 R5 RES., CHIP., 2.2k, 0.1W, 5% 0603 VISHAY, CRCW06032K2JKEA

15 2 R6, R18 RES., CHIP., 4.7k, 0.1W, 5% 0603 VISHAY, CRCW06034K7JKEA

16 1 RVM2 RES., CHIP., 10k, 0.1W, 1% 0603 YAGEO, RC0603FR-0710KL

17 2 RBFB1, ROFB1 RES., CHIP., 1M, 0.1W, 1% 0603 VISHAY, CRCW06031M00FKEA

18 1 RBFB2 RES., CHIP., 84.5k, 0.1W, 1% 0603 VISHAY, CRCW060384K5FKEA

19 1 RC1 RES., CHIP., 4.22k, 0.1W, 1% 0603 YAGEO, RC0603FR-07422KL

dc1830af

DEMO MANUAL

DC1830A-A/DC1830A-B

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

20 1 RCL RES., CHIP., 24.3k, 0.1W, 1% 0603 VISHAY, CRCW060324K3FKEA

21 1 RIL RES., CHIP., 18.2k, 0.1W, 1% 0603 VISHAY, CRCW060318K2FKEA

22 1 RCS SENSOR RES., 0.01Ω 1W 2% 1508 SMD SUSUMU, RL3720WT-R010-G

22 1 RCX RES., CHIP., 0.0Ω, 0.1W, 0603 VISHAY, CRCW06030000Z0EA

23 1 RIS1 SENSOR RES., 0.015Ω 1W 2% 1508 SMD SUSUMU, RL3720WT-R015-G

24 1 RVM1 RES., CHIP., 143k, 0.1W, 1% 0603 VISHAY, CRCW0603143KFKEA

25 4 R4, R7, R14, R19 RES., CHIP., 100k, 0.1W, 5% 0603 VISHAY, CRCW0603100KJKEA

26 1 U1 I.C., LTC4000EUFD, 28-PIN QFN LINEAR TECH., LTC4000EUFD#PBF

DC1380A-B Additional Demo Board Circuit Components

1 0 CC1, CIGATE, CNTC, CCX, CCL, CIL, CVM CAP., 0603 OPT

2 0 CBGATE NO INSTALL

3 0 CL CAP., 1206, 50V OPT

4 0 CL1, CL2, CL3, CL4, CL5 CAP., 1206 OPT

5 0 D2 DIODE ZENER, SOT23-3 OPT

6 0 F1,F3 FUSE 12A 32V T-LAG 1206 SMD OPT

7 0 Q3, Q4 MOSFET P-CHAN., 30V, POWERPAK-8 OPT

8 0 Q5, Q6 SMALL-SIGNAL MOSFET OPT, ON SEMI., 2N7002LT1G

9 0 R1, R2, R3, R20, RCL, RIG, RBG, RBFBX,

ROFBX, ROFB2

RES., 0603 OPT

10 0 R8, R13 RES., CHIP., 10k, 0.1W, 1% 0603 OPT, YAGEO, RC0603FR-0710KL

11 0 R9 RES., CHIP., 68.1k, 0.1W, 1% 0603 OPT, VISHAY, CRCW060368K1FKEA

12 0 R10, R15 RES., CHIP., 20k, 0.1W, 1% 0603 OPT, VISHAY, CRCW060320K0FKEA

13 0 R11, R16 RES., CHIP., 38.3k, 0.1W, 1% 0603 OPT, VISHAY, CRCW060338K3FKEA

14 0 R12, R17 RES., CHIP., 1M, 0.1W, 1% 0603 OPT, VISHAY, CRCW06031M00FKEA

15 0 R14 RES., CHIP., 78.7k, 0.1W, 1% 0603 OPT, VISHAY, CRCW060378K7FKEA

16 0 RNTC2, RNTC3 THERMISTOR NTC 10k 5% 0603 OPT, VISHAY, NTHS0603N02N1002J

17 0 U2,U3 NANOPWR COMPARATOR, MSOP8 OPT, LINEAR TECH.,

LTC1540CMS8#PBF

DC1380A-B Hardware—For Demo Board Only

1 14 E1-E6, E9-E14, E18, E19 TESTPOINT, TURRET, 0.061" PBF MILL-MAX, 2308-2-00-80-00-00-07-0

2 5 E7, E8, E15, E16, E17 TESTPOINT, TURRET, 0.094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0

3 4 JP1, JP2, JP3, JP4 HEADER, 3-PIN 0.079 SINGLE ROW SAMTEC, TMM-103-02-L-S

4 4 XJP1, XJP2, XJP3, XJP4 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

5 9 J1, J2, J3, J4, J5, J6, J7, J8, J9 CONNECTOR, BANANA JACK KEYSTONE, 575-4

6 4 MTG1, MTG2, MTG3, MTG4 STAND-OFF, NYLON (SNAP ON), 0.50" TALL KEYSTONE, 8833 (SNAP ON)

dc1830af

DEMO MANUAL

DC1830A-A/DC1830A-B

SCHEMATIC DIAGRAM–DC1830A

dc1830af

DEMO MANUAL

DC1830A-A/DC1830A-B

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–MODIFIED DC1619A AS USED WITH DC1830A

dc1830af

DEMO MANUAL

DC1830A-A/DC1830A-B

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

LT 0712 • 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 applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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