DESCRIPTIO Micropower 1.5µW Sample/Second) Wide Supply Range 2.8V
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LTC1041 BANG-BANG Controller
DESCRIPTIO
Micropower 1.5µW Sample/Second) Wide Supply Range 2.8V High Accuracy Guaranteed POINT Error ±0.5mV Guaranteed Deadband ±0.1% Value Wide Input Voltage Range Ground Outputs with Supply Independent Ground-Referred Control Inputs Small Size 8-Pin
APPLICATIO
LTC1041 monolithic CMOS BANG-BANG controller manufactured using Linear Technology's enhanced LTCMOSsilicon gate process. BANG-BANG loops characterized turning control element fully fully regulate average value parameter controlled. POINT input determines average control value DELTA input sets deadband. deadband always DELTA centered around POINT. Independent control POINT deadband, with interaction, made possible unique sampling input structure LTC1041. external connected sets sampling rate. start each sample, internal power analog section switched 80µs. During this time, analog inputs sampled compared. After comparison complete, power switched off. This achieves extremely average power consumption sampling rates. CMOS logic holds output continuously while consuming virtually power. keep system power absolute minimum, switched power output (VP-P) provided. External loads, such bridge networks resistive dividers, driven this switched output. output logic sense (i.e., reversed (i.e., GND) interchanging POINT inputs. This other effect operation LTC1041.
Temperature Control (Thermostats) Motor Speed Control Battery Charger ON-OFF Control Loop
registered trademarks Linear Technology Corporation. LTCMOS trademark Linear Technology Corporation.
TYPICAL APPLICATIO
2-WIRE THERMOSTAT 0.1µF 4.32k 4.99k
Supply Current Sampling Frequency
10000 1000
LTC1041 DELTA 0.5°F 400nA
Ultralow Power 50°F 100°F (2.4µW) Thermostat
SUPPLY CURRENT, (µA)
2N6660 1N4002 49.9
6.81k
LTC1041 TA01
RESISTORS YELLOW SPRINGS INSTRUMENT CO., INC. 44007. DRIVING THERMISTOR WITH VP-P ELIMINATES 3.8°F ERROR SELF-HEATING
0.01 1000 SAMPLING FREQUENCY, (Hz) 10000
LTC1041 TA02
TOTAL SUPPLY CURRENT LTC1041 SUPPLY CURRENT
1041fa
LTC1041
ABSOLUTE
(Note
RATI
PACKAGE/ORDER ATIO
VIEW POINT VP-P DELTA
Total Supply Voltage Input Voltage 0.3V) 0.3V) Operating Temperature Range LTC1041C -40°C 85°C LTC1041M (OBSOLETE) 55°C to125°C Storage Temperature Range 55°C 150°C Lead Temperature (Soldering, sec). 300°C Output Short Circuit Duration Continuous
ORDER PART NUMBER LTC1041CN8 LTC1041CS8
PACKAGE PACKAGE 8-LEAD PDIP 8-LEAD PDIP TJMAX 110°C, 150°C/W (N8) TJMAX 150°C, 150°C/W (S8) PACKAGE 8-LEAD CERDIP TJMAX 150°C, 100°C/W
LTC1041MJ8
OBSOLETE PACKAGE
Consider Package Alternate Source
Consult Marketing parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER POINT Error (Note
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. Test Conditions: unless otherwise specified.
CONDITIONS 2.8V (Note
(Note
Deadband Error (Note
2.8V (Note
(Note
IS(ON) IS(OFF) REXT
Input Current Equivalent Input Resistance Input Voltage Range Power Supply Range Power Supply Current (Note Power Supply Current (Note Response Time (Note ON/OFF Output (Note Logical Output Voltage Logical Output Voltage External Timing Resistor Sampling Frequency
25°C, (VIN, POINT DELTA Inputs) 1kHz (Note
TC1041M/LTC1041C ±0.3 ±0.05 ±0.05 ±0.6 ±0.1 ±0.1 ±0.3
±0.5 ±0.1 ±0.1 ±0.2 ±0.2
UNITS DELTA DELTA DELTA
DELTA
0.001 0.001 0.25
VP-P VP-P 4.75V, IOUT -360µA 4.75V, IOUT 1.6mA Resistor Connected between 25°C, REXT CEXT 0.1µF LTC1041C LTC1041M
10,000
Note Absolute Maximum Ratings those values beyond which life device impaired.
Note Applies over input voltage range limit includes gain uncertainty.
1041fa
LTC1041
ELECTRICAL CHARACTERISTICS
Note POINT error POINT where upper band limit lower band limit. Note Deadband error DELTA where upper band limit lower band limit. Note guaranteed design tested. 1/(fS 66pF). Note Average supply current IS(ON) lS(OFF). Note Response time internal oscillator independent overdrive voltage. VP-P pulse width. Note Output also capable meeting EIA/JEDEC standard series CMOS drive specifications.
TYPICAL PERFOR CHARACTERISTICS
IS(ON)
NORMALIZED SAMPLING FREQUENCY 25°C)
125°C 55°C SUPPLY VOLTAGE, 25°C
IS(ON) (mA)
SUPPLY VOLTAGE, 125°C -55°C
25°C
SAMPLE RATE, (Hz)
Response Time Supply Voltage
RESPONSE TIME, (µs)
25°C
SUPPLY VOLTAGE,
RESPONSE TIME, (µs)
LTC1041 TPC01
Normalized Sampling Frequency Temperature
0.1µF
Sampling Rate REXT, CEXT
CEXT 1000pF
CEXT 0.01µF
CEXT 0.05µF CEXT 0.1µF
CEXT
100k
REXT
LTC1041 TPC03
LTC1041 TPC02
Response Time Temperature
AMBIENT TEMPERATURE, (°C)
LTC1041 TPC04
LTC1041 TPC05
1041fa
LTC1041 TYPICAL PERFOR CHARACTERISTICS
VP-P Output Voltage Load Current
AVERAGE INPUT RESISTANCE, (1/fS 66pF)
TYPICAL OUTPUT VOLTAGE DROP VP-P) LOAD CURRENT, (mA) 2.8V
APPLICATIO ATIO
LTC1041 uses sampled data techniques achieve unique characteristics. consists comparators, each which differential inputs (Figure 1a). When voltages comparator's inputs positive, output high when negative, output low. inputs interconnected such that
COMP ON/OFF
ON/OFF OUTPUT
POINT DELTA CEXT
COMP
REXT
VP-P CIRCUIT VP-P
TIMING GENERATOR POWER 80µs
Figure LTC1041 Block Diagram
Sampling Frequency
1010
SAMPLING FREQUENCY (Hz)
LTC1041 TPC06
LTC1041 TPC07
flip-flop reset (ON/OFF GND) when (SET POINT DELTA) (ON/OFF when (SET POINT DELTA). This makes very precise hysteresis loop DELTA centered around POINT. (See Figure 1b.) dual differential input structure made with CMOS switches precision capacitor array. Input impedance characteristics LTC1041 determined from equivalent circuit shown Figure input capacitance will charge with time constant
POINT DELTA DELTA
DEADBAND
INPUT VOLTAGE,
LTC1041 AI01b
LTC1041 AI01a
1041fa
LTC1041
APPLICATIO ATIO
33pF)
LTC1041 DIFFERENTIAL INPUT
LTC1041 AI01
Figure Equivalent Input Circuit
CIN. ability fully charge from signal source during controller's active time critical determining errors caused input charging current. source resistances less than 10k, fully charges error caused charging current. source resistances greater than 10k, cannot fully charge, causing voltage errors. minimize these errors, input bypass capacitor, should used. Charge shared between causing small voltage error. magnitude this error (CIN CS). This error made arbitrarily small increasing averaging effect bypass capacitor, causes another error term. Each time input switches cycle between plus minus inputs, charged discharged. average input current this IAVG where sampling frequency. Because input current directly proportional differential input voltage, LTC1041 said have average input resistance VIN/IAVG I/(fS CIN). Since comparator inputs connected parallel, half this value (see typical curve versus Sampling Frequency). This finite input resistance causes error voltage divider between RIN. input voltage error caused both these effects VERROR [2CIN/(2CIN RS/(RS RIN)]. Example: assume 10Hz, 1µF, VERROR 1V(66µV 660µV) 726µV. Notice that most error caused RIN. sampling frequency reduced 1Hz, voltage error from input impedance effects reduced 136µV.
Input Voltage Range input switches LTC1041 capable switching either supply ground. Consequently, input voltage range includes both supply rails. This further benefit sampling input structure. Error Specifications only measurable errors LTC1041 deviations from "ideal" upper lower switching levels (Figure 1b). From control standpoint, error POINT deadband critical. These errors defined terms
POINT error POINT deadband error DELTA
specified error limits (see electrical characteristics) include error offset, power supply variation, gain, time temperature. Pulsed Power (VP-P) Output often desirable LTC1041 with resistive networks such bridges voltage dividers. power consumed these resistive networks exceed that LTC1041 itself. sample rates LTC1041 spends most time off. switched power output, VP-P, provided drive input network, reducing average power well. VP-P switched during controller's active time 80µs) high impedance (open circuit) when internal power switched off. Figure shows VP-P output circuit. VP-P output voltage precisely controlled when driving load (see typical curve VP-P Output Voltage Load Current). spite this, high precision achieved ways: driving ratiometric networks driving fast settling references. ratiometric networks inputs proportional VP-P (Figure Consequently, absolute value VP-P does affect accuracy.
1041fa
LTC1041
APPLICATIO ATIO
80µs COMPARATOR TIME
VP-P
LTC1041 AI03
Figure VP-P Output Switch
POINT LTC1041
Figure Ratiometric Network Driven VP-P
POINT LTC1041
LT1009-2.5
DELTA
LTC1041 AI05
Figure Driving Reference with VP-P Output
best possible performance needed, inputs LTC1041 must completely settle within start comparison cycle (VP-P high impedance transition). Also, critical that input voltages change during 80µs active time. When driving resistive input networks with VP-P, capacitive loading should minimized meet settling time requirement. Further, care should exercised layout when driving networks with source impedances, seen LTC1041, greater than (see 10k).
applications where absolute reference required, VP-P output used drive fast settling reference. LTC1009 2.5V reference settles ideal this application (Figure current through must large enough supply LT1009 minimum bias current 1mA) load current, Internal Oscillator internal oscillator allows LTC1041 strobe itself. frequency oscillation, hence sampling rate, with external network (see typical curve, Sampling Rate REXT, CEXT). REXT CEXT connected shown Figure assure oscillation, REXT must between 100k 10M. There limit size CEXT. sampling rates, REXT very important determining power consumption. REXT consumes power continuously. average voltage approximately V+/2, giving power dissipation PREXT (V+/ 2)2/REXT. Example: assume REXT PREXT (2.5)2/106 6.25/µW. This approximately four times power consumed LTC1041 sample/second. Where power premium, REXT should made large possible. Note that power dissipated REXT function CEXT. high sampling rates needed power consumption secondary importance, convenient maximum possible sampling rate make REXT 100k CEXT sampling rate, controller's active time, will nominally 10kHz. synchronize Sampling LTC1041 external frequency source, driven CMOS gate. CMOS gate necessary because input trip points oscillator close supply rails does have enough output swing. Externally driven, there will delay from rising edge input start sampling cycle approximately 5µs.
VP-P DELTA
LTC1041 AI04
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LTC1041
TYPICAL APPLICATIO
Motor Speed Controller
100k
1N4002 MOTOR* TACH 1.1k 2N6387 LTC1041 320pF LT1009 320k SPEED DEMAND
*CANNON CKT26-T5-3SAE
106B
74C00 D0T20 LEAD ACID
36.5k 2.21k LTC1041 0.1µF 1N4022 74C00 1N4002
Information furnished Linear Technology Corporation believed accurate reliable. However, responsibility assumed use. Linear Technology Corporation makes representation that interconnection circuits described herein will infringe existing patent rights.
DEADBAND
LTC1041 TA03
Battery Charger
LT1019-5 74C00
1N4002 115VAC
100µF
100k
FIRES ZERO CROSSING. BATTERY VOLTAGE. BATTERY MEASURED WITH ZERO CHARGE CURRENT
LTC1041 TA04
1041fa
LTC1041
PACKAGE DESCRIPTIO
CORNER LEADS OPTION PLCS) .300 (7.62 BSC) .023 .045 (0.584 1.143) HALF LEAD OPTION .045 .068 (1.143 1.650) FULL LEAD OPTION .045 .065 (1.143 1.651) .014 .026 (0.360 0.660) .100 (2.54) .200 (5.080) .015 .060 (0.381 1.524)
.008 .018 (0.203 0.457)
NOTE: LEAD DIMENSIONS APPLY SOLDER DIP/PLATE PLATE LEADS
.300 .325 (7.620 8.255)
.008 .015 (0.203 0.381)
.065 (1.651) .120 (3.048) .020 (0.508) .018 .003 (0.457 0.076)
+.035 .325 -.015 +0.889 8.255 -0.381
INCHES MILLIMETERS *THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED .010 INCH (0.254mm)
NOTE: DIMENSIONS
.010 .020 (0.254 0.508) .008 .010 (0.203 0.254)
.053 .069 (1.346 1.752)
.016 .050 (0.406 1.270) NOTE: DIMENSIONS
INCHES (MILLIMETERS) DRAWING SCALE THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED .006" (0.15mm)
.014 .019 (0.355 0.483)
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417
(408) 432-1900 FAX: (408) 434-0507
Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference 05-08-1110)
.005 (0.127) .405 (10.287) .025 (0.635) .125 3.175 .220 .310 (5.588 7.874)
0801
OBSOLETE PACKAGE
Package 8-Lead PDIP (Narrow .300 Inch)
(Reference 05-08-1510)
.400* (10.160)
.045 .065 (1.143 1.651)
.130 .005 (3.302 0.127)
.255 .015* (6.477 0.381)
1002
.100 (2.54)
Package 8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference 05-08-1610)
.189 .197 (4.801 5.004) NOTE .004 .010 (0.101 0.254) .228 .244 (5.791 6.197) .030 ±.005 .150 .157 (3.810 3.988) NOTE .245 .160 ±.005 .050
.045 ±.005
.050 (1.270)
RECOMMENDED SOLDER LAYOUT
0502
1041fa LW/TP 1202 PRINTED
www.linear.com
LINEAR TECHNOLOGY CORPORATION 1985
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