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LT1036 Logic Controlled Regulator
DESCRIPTIO
FEATURES
s
s s s s s
Two Regulated Outputs: 12V at 3A 5V at 75mA 2% Output Voltage Tolerance 60dB Ripple Rejection 0.7% Load Regulation TTL and CMOS Compatible Logic Control 100% Thermal Burn-In on All Devices
The LT(R)1036 features two positive regulators in the same package. The 12V main regulator offers excellent performance while supplying load currents up to 3A, and the 5V auxiliary regulator provides similar performance while supplying lighter loads of 75mA. The main regulator has the additional feature of being under the shutdown control of a logic signal. When the enable pin is taken to a low logic level, the main regulator shuts down and its output voltage goes to near 0V. During this command, the auxiliary output is unaffected by the main regulator's condition and continues to provide a 5V output. The main output has current and power limiting combined with thermal shutdown to make it virtually blowout proof. The auxiliary output is not affected by the thermal shut down mechanism or the state of the main output, allowing it to be used as a back-up in case of overloads or shorts on the main supply. The logic input of the LT1036 (enable pin) has a 1.6V threshold and can be driven from a high source impedance. This allows it to be driven by most logic families, including TTL and CMOS. For a dual 5V version of the LT1036, please see the LT1035 data sheet.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s s s
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Power Supply Sequencing Remote On/Off Power Control Selective System Power During Emergency Power Operation Memory Power Supply with Back-Up
TYPICAL APPLICATIO
Functional Diagram
12V VIN 5 IN LT1036 ENABLE LOGIC 2 EN GND 3 AUX 4 5V OUT 1 OV
CURRENT (A)
Guaranteed Load Current, 12V Output
5 4.5 4 3.5 3 2.5 2 1.5
LT1036M/1036C * FD01
1 0.5 0 14 16 18 20 22 24 26 INPUT VOLTAGE (V) 28 30
LT1036M/1036C * FD02
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LT1036
ABSOLUTE
AXI U
RATI GS (Note 1)
Operating Junction Temperature LT1036M (OBSOLETE) ..................... - 55C to 150C LT1036C ................................................ 0C to 125C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
Power Dissipation Continuous (Note 6) ........................................... 24W Fault Conditions .............................. Internally Limited Input Voltage (VIN) .................................................. 30V Enable Voltage (VEN) ............................................... 30V
PRECO DITIO I G 100% Burn-In in Thermal Limit PACKAGE/ORDER I FOR ATIO
BOTTOM VIEW VIN 5 1 2 VO
ORDER PART NUMBER
CASE IS GND
LT1036MK LT1036CK
4 AUX
VEN K PACKAGE 4-LEAD TO-3 METAL CAN TJMAX = 125C, JC = 3C/W
OBSOLETE PACKAGE
Consider the T Package as an Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL VO PARAMETER Output Voltage High Low VO IO VO VIN Load Regulation (Note 7) Line Regulation Ripple Rejection Thermal Regulation IO ISC VIN Available Load Current (Note 7) Short Circuit Current Input Voltage to Maintain Regulation (Dropout Voltage) CONDITIONS TJ = 25C
The q denotes the specifications which apply over the full operating temperature range. Main regulator (Note 2) VIN = 15V unless otherwise noted.
MIN 11.76
q q q
15V VIN 30V, IOUT IMAX (Note 7) 7V VIN 30V VIN = 16V 0 IO 3A (Note 3) 15V VIN 30V (Note 3) 50Hz f 500Hz (Note 9) PD = 20W (Note 5) 15V VIN 20V VIN = 25V VIN = 15V VIN = 25V (Note 6) IO = 1A IO = 3A
2
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FRONT VIEW 5 4 3 2 1 T PACKAGE 5-LEAD PLASTIC TO-220 TJMAX = 150C, JC = 2.5C/W TJMAX = 125C, JC = 2.5C/W VO GND VEN VIN AUX
ORDER PART NUMBER LT1036CT
TYP 12
MAX 12.24 12.48
UNITS V V V mV mV/V dB
11.52 0.1 10 1 50 60 0.003
0.3 80 4
0.012
%/W A A
q q
3 2
4 2.7 2.3 1 4 2 14.5 15
A A V V
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q q
13.8 14.4
LT1036
ELECTRICAL CHARACTERISTICS
SYMBOL IQ JC PARAMETER Quiescent Current Thermal Resistance, Junction to Case CONDITIONS Output High Output Low TO-220
The q denotes the specifications which apply over the full operating temperature range. Main Regulator (Note 2) VIN = 15V unless otherwise noted.
MIN TYP 4 3 2 MAX 5.5 4.5 3 UNITS mA mA C/W
Auxiliary Regulator (Note 2)
SYMBOL VO PARAMETER Output Voltage CONDITIONS TJ = 25C 7.2V VIN 30V 0mA IO 75mA VO IO VO VIN Load Regulation Line Regulation Ripple Rejection ISC VIN Short Circuit Current (Note 8) Input Voltage to Maintain Regulation (Dropout Voltage) 7.2V VIN 30V 0mA IO 75mA (Note 3) 7.2V VIN 30V (Note 3) 50Hz f 500Hz 7.0V VIN 30V (Note 6) IO 10mA IO = 75mA
q q
MIN 4.9 4.8
TYP 5.0 5.0 5 0.2 74 140
MAX 5.1 5.2 15 1 2
UNITS V V mV mV/V mV/V dB
250
mA
q q
6.2 6.8
6.5 7.2
V V
Logic Control (Note 2)
SYMBOL VEN PARAMETER Enable Threshold Voltage Enable Pin Current CONDITIONS 7.0V VIN 30V TJ = 25C VEN 1V (Note 4) VEN 2.4V
q q q
MIN 1.45 1.3 0
TYP 1.6 1.6 1.5 0
MAX 1.7 1.8 12 6
UNITS V V A A
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Unless otherwise indicated, these specifications apply for VIN = 15V, IO = 0mA, and TJ = 25C. Note 3: Line and load regulation is measured using a low duty cycle pulse, causing little change in the junction temperature. Effects due to thermal gradients and device heating must be taken into account separately. Note 4: When the enable pin is at a low logic level, current flows out of the enable pin.
Note 5: Pulse length for this measurement is 20ms. Note 6: Input voltage is reduced until output drops by 100mV from its initial value. Note 7: See "Guaranteed Load Current" graph. Note 8: Continuous shorts on the auxiliary output are not allowed unless adequate heat sinking is used to maintain junction temperature below 150C. Note 9: Guaranteed but not tested.
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LT1036 TYPICAL PERFOR A CE CHARACTERISTICS
Minimum Input-Output Differential of Main Output
2.6 2.4
INPUT-OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE CHANGE (mV)
2.2 2.0 1.8 1.6 TJ = 25C 1.4 1.2 1.0 0 0.5 TJ = 150C 1.0 2.0 1.5 OUTPUT CURRENT (A) 2.5 3.0
INPUT-OUTPUT VOLTAGE (V)
TJ = -55C
INPUT TRANSIENT (V)
LT1036M/1036C * TPC01
Maximum Available Load Current, 12V Output
5 TJ = 25C 4 8 7
TJ = 25C 6 5 4 12V OUTPUT "ON"
MAIN OUTPUT (V)
SUPPLY CURRENT (mA)
CURRENT (A)
DEVICE OUT OF REGULATION 3 BELOW 14V 2
AUXILIARY OUTPUT (V)
1 1 0 0 4 8 12 16 20 24 INPUT VOLTAGE (V) 28 32 0 0 3 6 9 12 15 18 21 24 27 30 INPUT VOLTAGE (V)
LT1036M/1036C * TPC05
LT1036M/1036C * TPC04
Load Transient Response, 12V Output
50
OUTPUT VOLTAGES CHANGE (V)
0 -50 50 COUT = 1F TANTALUM
CURRENT (A)
0 -50 COUT = 10F TANTALUM LOAD TRANSIENT 0.2 0 IOUT = 1A IOUT = 0.2A 0 2 4 6 8 TIME (s) 10 12 14
0.6 0.8 1.0 1.2
TJ = 25C
THRESHOLD (V)
LOAD TRANSIENT (A)
LT1036M/1036C * TPC07
4
UW
Minimum Input-Output Differential of Auxiliary Output
2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0 20 60 80 40 OUTPUT CURRENT (mA) 100 TJ = 150C TJ = 25C TJ = -55C
Line Transient Response, 12V Output
20 0 -20 20 0 -20 1 0 VIN = 18V 0 2 4 6 8 TIME (s) 10 12 14 VIN = 1V COUT = 10F TANTALUM COUT = 1F TANTALUM
LT1036M/1036C * TPC02
LT1036M/1036C * TPC03
Quiescent Current
12.2 12.1 12.0 11.9 11.8
Output Voltage vs Temperature
3 12V OUTPUT "OFF" 2
5.1 5.0 4.9 4.8 4.7 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C)
LT1036M/1036C * TPC06
Enable Pin Characteristics
1.75
0 -0.2 0.4
Enable Threshold
1.70 1.65 1.60 1.55 1.50 1.45
1.4 1.6 1.8 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 20 ENABLE VOLTAGE (V)* *NOTE SCALE CHANGE 0
LT1036M/1036C * TPC08
1.40 1.35 -50 -25 0 25 50 75 100 125 150 JUNCTION TEMPERATURE (C)
LT1036M/1036C * TPC09
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LT1036 TYPICAL PERFOR A CE CHARACTERISTICS
Short-Circuit Current, 12V Output
5
OUTPUT VOLTAGE (V)
4 CURRENT (A)
TJ = 25C
3
6 3 0
COUT = 10F
NOISE (VRMS)
2
ENABLE VOLTAGE (V)
1
0 0 4 8 12 16 20 24 INPUT VOLTAGE (V) 28 32 0 10 20 30 40 50 60 70 80 90 TIME (s)
LT1036M/1036C * TPC11
LT1036M/1036C * TPC10
APPLICATIO S I FOR ATIO
General Information
The LT1036 is a dual output regulator. The main 12V output is capable of delivering up to 3A of load current and can be shut down with a logic signal. The auxiliary 5V output supplies a minimum of 75mA and is unaffected by the logic signal. The outputs are trimmed to 2% initial tolerance and exhibit excellent line and load regulation. The logic control feature makes the LT1036 ideal for many system applications where it is desirable to power-up a portion of the system for a period of time, and then power the system down during a standby operation. Applications such as multiple power supply sequencing, elimination of expensive AC and DC power switches, delayed start applications, switching 12V DC loads, and many others are now easily accomplished. Timing functions, such as delayed power-up or powerdown, can also be performed directly at the enable pin. Because a logic low on the enable pin shuts down the main regulator, feedback from output to enable can be used to generate hysteresis or latching functions.
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Output Switching Characteristics
15 12 9 CCOUT 0.1F OUT 0.1F COUT = 1F 200 180 160 140 120 100 80 60 40 0 20
Output Voltage Noise
MAIN (12V) OUTPUT
SEE APPLICATION SECTION FOR FALL TIME INFORMATION
5
AUXILIARY OUTPUT 300 3k 10k 1k BANDWIDTH (1 POLE) (Hz) 30k
0 100
LT1036M/1036C * TPC12
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The low quiescent current drain of the LT1036 makes it useful in battery-powered or battery back-up applications. The enable pin can be used as a "low battery" detector or to shut down major portions of system power, allowing memory portions to continue to operate from the auxiliary output. At low output currents, the auxiliary output will regulate with input voltage typically as low as 6.2V, giving maximum battery life. Good design practice with all regulators is to bypass the input and output terminals. A 2F solid tantalum at the input and at both outputs is suggested. For the applications which follow, the bypass capacitors are still recommended, but for simplicity are not shown on the diagram. It is also recommended that for maximum noise immunity the voltage enable pin be tied high if it is unused. It can be tied directly to VIN, as shown in Figure 1, or to the auxiliary Output. If the enable pin is left open, it will float to a high logic level of approximately 1.6V and the main output regulator will be at 12V. The enable pin is fully protected against input voltages up to 30V, even if the power input voltage is zero.
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LT1036
APPLICATIO S I FOR ATIO
The basic shutdown control circuit uses a direct gate drive or an open collector driver and a pull-up resistor which are tied to VAUX, as shown in Figure 2.
VIN 5 IN LT1036 EN GND 3 AUX OUT 1
+
4
VO 12V 2F 5V
+
1F
2
+
2F
LT1036M/1036C * AI01
Figure 1
7.5-20V IN LT1036 EN VAUX GND AUX 0mA-75mA LOAD 5V 0A-3A LOAD OUT 12V
Figure 2
Driving the Enable Pin The enable pin equivalent schematic is shown in Figure 3. Basically, enable pin current is zero above the threshold and about 1.5A below the threshold, flowing out of the pin. Standard logic, such as TTL and CMOS, will interface directly to the enable pin, even if the logic output swing is higher than the input voltage (VIN) to the regulator. 15V CMOS can be used to drive the enable pin, even if the regulator is not powered up, without loading the CMOS output. Timing functions, such as delayed power-up or power-down can be implemented with an RC network. The current flowing out of the enable pin should not
70A
CURRENT FORCED INTO OUTPUT (mA)
1V ENABLE
LT1036M/1036C * AI03
Figure 3
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be used as the timing current in delayed power-up applications as it is temperature sensitive and varies somewhat from device to device. Instead, a resistor tied to the auxiliary output, the input, or to a logic signal should be used. The timing resistor chosen should provide at least 25A of current to "swamp out" the effects of the internal current. Main Output Current Voltage Characteristics Following a high to low transition at the enable pin, the main regulator output will begin to drop after a delay of approximately 0.4s. With no capacitive load, the output will fall to zero in approximately 0.8s (RL = 4 to 100). With a capacitive load, fall time is limited by the RC product of the load and the output capacitance. For light loads (RL >400), the discharge time is controlled by an internal current pull-down of 15mA for output voltages down to 1.5V. Below 1.5V, the pull-down current drops to 4mA. The DC output voltage in the shutdown mode is approximately 0.12V due to an internal current path in the regulator. (See Figure 4.) The user should note that the output in the low state can only sink about 3mA. If current is forced into the output, the output voltage will rise to 1V at 5mA and about 1.5V at 10mA. With no output capacitor, the rise time of the main output is about 12s. With an output capacitor, rise time is limited by the short circuit current of the LT1036 and the load capacitance. A 10F output capacitor slows the output rise time to approximately 80s.
10 9 VIN = 15V 8 7 6 5 4 TJ = 25C 3 2 1 0 0 0.2 0.4 0.6 0.8 1.0 1.2 OUTPUT VOLTAGE (V) 1.4 1.6 TJ = 150C TJ = -55C
LT1036M/1036C * AI02 LT1036M/1036C * AI04
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Figure 4
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LT1036
APPLICATIO S I FOR ATIO
Output Current
The main output current limits at about 4A for input voltages below 20V. Internal foldback, or "power limiting", circuitry detects the input-output voltage differential and reduces current limit for input to output voltages exceeding 8V. With 25V input, for instance, short circuit current is reduced to 0.9A.
TYPICAL APPLICATIO S
Fast Turn-Off, Delayed Turn-On
VIN IN LT1036 * *CAN BE ANY GATE TYPE EN GND AUX EN OUT 12V VIN IN LT1036 GND AUX 0.33F 5V R1 100k tON = 0.3 R1C1
LT1036M/1036C * TA01
+
C1
Delayed Power-Up
VIN IN LT1036 EN GND AUX 5V OUT 12V
C1
R1 27k
tDELAY 0.4 R1C1
LT1036M/1036C * TA03
Power Supply Turn-On Sequencing
VIN
IN LT1036 EN GND
R1 C1 t1 = 0.4 R1C1 t2 = 0.15 R2C2
LT1036M/1036C * TA05
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An additional feature of the LT1036 is that the auxiliary supply does not incorporate, nor is it affected by, thermal shutdown. Any fault condition of the main regulator will not affect the auxiliary output voltage. The following applications circuits will serve to indicate the versatility of the LT1036.
Latch-Off with Output Short
OUT 68k 12V
LT1036M/1036C * TA02
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Thermal Cutoff at High Ambient Temperature
VIN IN LT1036 EN GND AUX 26.1k 154k OUT 5V
tOFF = 58C tON = 46C
Rt*
*YELLOW SPRINGS #44008. 30k at 25C
LT1036M/1036C * TA04
OUT R2 AUX C2
IN LT1036 EN GND
OUT
AUX
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LT1036
TYPICAL APPLICATIO S
First-On, Last-Off Sequencing First-On, First-Off Sequencing
VIN
OUT LT1036 "FIRST ON" EN GND AUX R4 150k
IN
12V
5V R1 10k
R2 2.2k tON (1) = 50ms tON (2) = 150ms R3 1k OFF ON tON (1) = 100ms tON (2) = 200ms
+
50F
TO SECONDARY OF AC POWER TRANSFORMER 4N46 1N4148(4)
Low Dissipation Regulator
27k 2N6667 VIN 17.5VDC TO 30VDC 1k 1mH* 15.5V 5 VIN AUX 6000F 4 LT1035 VOUT LT1036 EN 2 GND 3 1 3.5V DC UNDER ALL CONDITIONS
1N4003
3.9k 1k 1000pF
8 7
150k
+ -
4
2
LT1011 COMPARATOR 1 3 5k 5k
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IN LT1036 EN GND
OUT
12V
VIN
AUX
5V R5 150k
OUT LT1036 "FIRST ON" EN GND AUX R4 150k
IN
12V 5V ON R2 4.7k R5 1k R1 1k OFF
IN LT1036 EN GND
OUT
12V
AUX
5V R6 150k
R3 1k
+
100F
LT1036M/1036C * TA06
LT1036M/1036C * TA07
Line Dropout Detector
TO FILTERED RAW DC TRIP SET 18k 500k EN IN LT1036 GND AUX 5V AUXILIARY OUT 12V
0.1F 2k
8 3
-
LT1011 7 1 4
3.3k DROPOUT SIGNAL
2
+
3k
LT1036M/1036C * TA08
Optocoupled Output Control
VIN IN LT1036 EN
12V OUTPUT 10F
OUT
12V
GND
AUX
5V
+
+
10.5k
R
COUPLER "ON" = OUTPUT "ON"
OUTPUT CONTROL LOGIC *DALE TD-5 THIS CIRCUIT IS DESIGNED TO REDUCE POWER DISSIPATION IN THE LT1036 OVER A 90VAC-140VAC INPUT RANGE
LT1036M/1036C * TA09
SELECT R DEPENDING UPON THE ON-RESITANCE OF THE OPTOCOUPLER
LT1036M/1036C * TA10
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LT1036
SCHE ATIC DIAGRA
VIN 5 Q38 860 800
Q37
Q36 Q33
Q35 Q28 D1 5k Q23 Q24 Q27 5k 430 30 pF Q26 2k 8k Q29
Q1
Q2 D5
8k 5k AUX OUTPUT 4 20 4k 10k Q5 4 Q3 2k Q4
900 Q7 Q8 Q11 20pF Q10 Q9 1.2k 500 Q22 8k Q6 7k Q16 Q15 2.1k Q19 Q18 2.9k Q17 400 Q20 Q21 D3 6.5V 20pF Q30 Q25 10pF
12k
W
6k 3k Q31 Q32 D2 7V 10k Q34 Q13 Q12 3k 1.3k 750 115 50 0.03 15pF MAIN OUTPUT 1 4.8k 20.4k Q14 2k Q39 10k 100k 500 GND 3 2 ENABLE
LT1036M/1036C * SD01
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LT1036
PACKAGE DESCRIPTIO
0.390 - 0.415 (9.906 - 10.541)
0.230 - 0.270 (5.842 - 6.858) 0.460 - 0.500 (11.684 - 12.700) 0.570 - 0.620 (14.478 - 15.748) 0.330 - 0.370 (8.382 - 9.398) 0.700 - 0.728 (17.78 - 18.491) 0.620 (15.75) TYP
BSC
0.067 (1.70)
0.028 - 0.038 (0.711 - 0.965)
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T Package 5-Lead Plastic TO-220 (Standard) (Reference LTC DWG # 05-08-1421)
0.147 - 0.155 (3.734 - 3.937) DIA 0.165 - 0.180 (4.191 - 4.572) 0.045 - 0.055 (1.143 - 1.397) SEATING PLANE 0.152 - 0.202 0.260 - 0.320 (3.861 - 5.131) (6.60 - 8.13) 0.095 - 0.115 (2.413 - 2.921) 0.155 - 0.195* (3.937 - 4.953) 0.013 - 0.023 (0.330 - 0.584) 0.135 - 0.165 (3.429 - 4.191) * MEASURED AT THE SEATING PLANE
T5 (TO-220) 0399
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LT1036
PACKAGE DESCRIPTIO
0.320 - 0.350 (8.13 - 8.89)
0.420 - 0.480 (10.67 - 12.19)
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.
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K Package 4-Lead TO-3 Metal Can
(Reference LTC DWG # 05-08-1311)
0.760 - 0.775 (19.30 - 19.69) 0.060 - 0.135 (1.524 - 3.429) 0.038 - 0.043 (0.965 - 1.09) 1.177 - 1.197 (29.90 - 30.40) 0.655 - 0.675 (16.64 - 19.05) 0.151 - 0.161 (3.84 - 4.09) DIA 2 PLC 0.167 - 0.177 (4.24 - 4.49) R 72 18 0.490 - 0.510 (12.45 - 12.95) R 0.470 TP P.C.D.
K4(TO-3) 1098
OBSOLETE PACKAGE
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LT1036
RELATED PARTS
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LT3150
Fast Transient Response Low Dropout Regulator MOSFET Driver, Up to 10A
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
q
LW/TP 0902 1K REV A * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 1985

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