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LTC1443/LTC1444/LTC1445 Ultralow Power Quad Comparators with Reference
FEATURES
s s
DESCRIPTIO
(R)
s s s s s s s s
Ultralow Quiescent Current: 8.5A Max Wide Supply Range Single: 2V to 11V Dual: 1V to 5.5V Input Voltage Range Includes the Negative Supply Reference Output Drives 0.01F Capacitor Adjustable Hysteresis (LTC1444/LTC1445) TTL/CMOS Compatible Outputs Propagation Delay: 12s (Typ) (10mV Overdrive) No Crowbar Current 40mA Continuous Source Current Pin Compatible Upgrades for MAX924 (LTC1443)
The LTC 1443/LTC1444/LTC1445 are ultralow power quad comparators with a built-in reference. The comparators feature less than 8.5A supply current over temperature, an internal reference (1.182V 1% for LTC1443 or 1.221V 1% for LTC1444/LTC1445), programmable hysteresis (LTC1444/LTC1445) and TTL/CMOS output (LTC1443/ LTC1445) that sinks and sources current (open-drain output for LTC1444). The reference output can drive a bypass capacitor of up to 0.01F without oscillation. The comparators operate from a single 2V to 11V supply or a dual 1V to 5.5V supply (LTC1443). Comparator hysteresis is easily programmable using two resistors and the HYST pin (LTC1444/LTC1445). Each comparator's input operates from the negative supply to within 1.3V of the positive supply. The LTC1443/LTC1445 comparator output stage can continuously source up to 40mA. By eliminating the cross-conducting current that normally happens when the comparator changes logic states, power supply glitches are eliminated. The LTC1443/LTC1444/LTC1445 are available in the 16-pin SO and PDIP packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s s s s
Battery-Powered System Monitoring Threshold Detectors Window Comparators Oscillator Circuits
TYPICAL APPLICATIO
VIN 3.4M 1% 5V TO 8V
Reference Settling Test Circuit
3 V+ 5 IN A+ V+ 5V 2 4 IN A
-
8V
2mV/DIV
+
OUT
VREF
-
LTC1445 V- 9 OUT 2ms/DIV
LTC1443/1444/1445 * TA02
14 HYST 1.21M 1% R1 10k R2 2.4M 8 REF R3 430 C1 1.0F
LTC1443/44/45 * TA01
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Reference Settling
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1
LTC1443/LTC1444/LTC1445
ABSOLUTE AXI U RATI GS
Voltage: V + to V -, V + to GND, GND to V - ...........12V to - 0.3V IN+, IN-, HYST ................. (V + + 0.3V) to (V - - 0.3V) REF .................................. (V + + 0.3V) to (V - - 0.3V) OUT (LTC1443) ............. (V + + 0.3V) to (GND - 0.3V) OUT (LTC1444/LTC1445) ......................................... (V + + 0.3V) to (V - - 0.3V) Storage Temperature Range ................. - 65C to 150C Lead Temperature Range (Soldering, 10 sec)....... 300C
PACKAGE/ORDER I FOR ATIO
TOP VIEW OUT B 1 OUT A 2 V+ 3 IN A- 4 IN A+ IN B- 5 6 16 OUT C 15 OUT D 14 GND 13 IN D+ 12 IN D-
+
ORDER PART NUMBER LTC1443CN LTC1443CS LTC1443IN LTC1443IS
11 IN C V-
IN B+ 7 REF 8 N PACKAGE 16-LEAD PDIP
10 IN C- 9
S PACKAGE 16-LEAD PLASTIC SO
TJMAX = 150C, JA = 90C/ W (N) TJMAX = 150C, JA = 150C/ W (S)
Consult factory for Military grade parts.
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. V+ = 5V, V - = GND = 0V, unless otherwise noted.
SYMBOL PARAMETER Power Supply V+ Supply Voltage Range ICC Supply Current Comparator VOS Comparator Input Offset Voltage IIN Input Leakage Current (IN+, IN -) Input Leakage Current (HYST) VCM Comparator Input Common Mode Range CMRR Common Mode Rejection Ratio PSRR Power Supply Rejection Ratio Noise Voltage Noise VHYST Hysteresis Input Voltage Range CONDITIONS
q
ELECTRICAL CHARACTERISTICS
IN+ = IN - = 80mV HYST = REF (LTC1444/LTC1445) VCM = 2.5V VIN+ = VIN- = 2.5V LTC1444/LTC1445 V - to (V+ - 1.3V) V+ = 2V to 11V 100Hz to 100kHz LTC1444, LTC1445
2
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(Note 1)
Current: IN+, IN-, HYST .................................................. 20mA REF ................................................................... 20mA OUT .................................................................. 50mA OUT Short Circuit Duration (V+ 5.5V) ....... Continuous Power Dissipation .............................................. 500mW Operating Temperature Range Commercial ............................................ 0C to 70C Industrial ............................................ - 40C to 85C
TOP VIEW OUT B 1 OUT A 2 V+ 3 IN A- 4 IN A+ IN B- IN B+ 5 6 7 16 OUT C 15 OUT D 14 HYST 13 IN D+ 12 IN D- 11 IN C+ 10 IN C- 9 V-
ORDER PART NUMBER LTC1444CN LTC1444CS LTC1444IN LTC1444IS LTC1445CN LTC1445CS LTC1445IN LTC1445IS
REF 8 N PACKAGE 16-LEAD PDIP
S PACKAGE 16-LEAD PLASTIC SO
TJMAX = 150C, JA = 90C/ W (N) TJMAX = 150C, JA = 150C/ W (S)
MIN 2.0
TYP
MAX 11.0 8.5
UNITS V A
q
5.5
q q q q
3.0 0.01 0.02 V- 0.1 0.1 20
10.0 1.0 1.0 V+ - 1.3V 1.0 1.0 REF
q
REF - 50mV
mV nA nA V mV/V mV/V VRMS V
LTC1443/LTC1444/LTC1445
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. V+ = 5V, V - = GND = 0V, unless otherwise noted.
SYMBOL PARAMETER Propagation Delay tPD VOH VOL Output High Voltage Output Low Voltage CONDITIONS Overdrive = 10mV, COUT = 100pF Overdrive = 100mV, COUT = 100pF IO = - 15mA; LTC1443/LTC1445 IO = 1.8mA; LTC1443 IO = 1.8mA; LTC1444/LTC1445 No Load, LTC1443 No Load, LTC1444/ LTC1445 ISOURCE ISINK Noise Reference Output Source Current Reference Output Sink Current Voltage Noise VREF 1mV VREF 2.5mV VREF 5mV 100Hz to 100kHz C Temp Range I Temp Range C Temp Range I Temp Range MIN TYP 12 4 UNITS s s V GND + 0.4V V V- + 0.4V V 1.194 1.200 1.233 1.239 V V V V A A A VRMS MAX
ELECTRICAL CHARACTERISTICS
q q q q q q q q q
V+ - 0.4V
Reference VREF Reference Voltage
1.170 1.164 1.209 1.203 100 10 10
1.182 1.221 200 15 15 100
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. V+ = 3V, V - = GND = 0V, unless otherwise noted.
SYMBOL PARAMETER Power Supply V+ Supply Voltage Range ICC Supply Current Comparator VOS Comparator Input Offset Voltage IIN Input Leakage Current (IN+, IN-) Input Leakage Current (HYST) VCM Comparator Input Common Mode Range CMRR Common Mode Rejection Ratio PSRR Power Supply Rejection Ratio Noise Voltage Noise VHYST Hysteresis Input Voltage Range tPD Propagation Delay VOH VOL Output High Voltage Output Low Voltage CONDITIONS
q
MIN 2.0
TYP
MAX 11.0 8 10.0 1.0 1.0 + - 1.3V V 1.0 1.0
UNITS V A
IN+ = IN - = 80mV, HYST = REF VCM = 1.5V VIN+ = VIN- = 1.5V LTC1444/LTC1445 V- to (V+ -1.3V)
q q q q q
5 3.0 0.01 0.02 V- 0.1 0.1 100
V+ = 2V to 11V 100Hz to 100kHz LTC1444/LTC1445 Overdrive = 10mV, COUT = 100pF Overdrive = 100mV, COUT = 100pF IO = - 10mA, LTC1443/LTC1445 IO = 0.8mA; LTC1443 IO = 0.8mA; LTC1444/LTC1445 No Load, LTC1443 No Load, LTC1444/ LTC1445 C Temp Range I Temp Range C Temp Range I Temp Range
q
REF - 50mV 14 5
q q q q q q q q q
V+ - 0.4V
mV nA nA V mV/V mV/V VRMS REF V s s V GND + 0.4V V V- + 0.4V V 1.194 1.200 1.233 1.239 V V V V A A A VRMS
Reference VREF Reference Voltage
ISOURCE ISINK Noise
Reference Output Source Current Reference Output Sink Current Noise Voltage
VREF 1mV VREF 2.5mV VREF 5mV 100Hz to 100kHz
1.170 1.164 1.209 1.203 60 10 10
1.182 1.221 120 15 15 100
Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired.
3
LTC1443/LTC1444/LTC1445 TYPICAL PERFOR A CE CHARACTERISTICS
LTC1444/LTC1445 Hysteresis Control
80 60
SUPPLY CURRENT (A) 5.2 TA = 25C 5.0
SUPPLY CURRENT (A)
5.4 5.0 4.6 4.2 3.8 3.4 3.0 -60 -40 -20
40
IN + - IN - (mV)
20 0 -20 -40 -60 -80 0 10 30 VREF - VHYST (mV) 20 40 50
LTC1443/44/45 * TPC01
LTC1444/LTC1445 Reference Voltage vs Temperature
1.224 V+ = 5V
1.186 1.184
REFERENCE VOLTAGE (V)
REFERENCE VOLTAGE (V)
1.182 1.180 1.178 1.176 1.174 1.172
REFERENCE VOLTAGE (V)
1.220
1.216
1.212
1.208 -60 -40 -20
0 20 40 60 80 100 120 TEMPERATURE (C)
LTC1443/44/45 * TPC04
LTC1443 Reference Output Voltage vs Output Load Current
1.194 1.192 1.190 1.188 1.186 1.184 1.182 1.180 0 5 10 15 20 25 30 35 LOAD CURRENT (A) 40 45 SINK V + = 5V V - = GND TA = 25C
REFERENCE OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE HIGH (V)
4.0
OUTPUT VOLTAGE HIGH (V)
LTC1443/44/45 * TPC07
4
UW
Supply Current vs Supply Voltage
5.8
Supply Current vs Temperature
IN+ = (IN- + 100mV) V - = GND (LTC1443) V+ = 5V V - = 0V V+ = 5V V - = -5V V+ = 3V V - = 0V
4.8 4.6 4.4 4.2 4.0 1.0 1.5 2.0 2.5 SUPPLY VOLTAGE (V) 3.0
0 20 40 60 80 100 120 TEMPERATURE (C)
LTC1443/44/45 * TPC03
LTC1443/44/45 * TPC02
LTC1443 Reference Voltage vs Temperature
1.184
V+ = 5V V - = GND
LTC1443 Reference Output Voltage vs Output Load Current
V + = 5V V - = GND TA = 25C
1.183 1.182 1.181 1.180 1.179 1.178
0 20 40 60 80 100 120 140 TEMPERATURE (C)
LTC1443/44/45 * TPC05
SOURCE
1.170 -60 -40 -20
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 LOAD CURRENT (mA)
LTC1443/44/45 * TPC06
Comparator Output Voltage High vs Load Current
5.0 TA = 25C V+ = 5V
2.0 2.5
Comparator Output Voltage Low vs Load Current
TA = 25C
1.5
3.0 V+ = 3V 2.0 V+ = 2V
V + = 2V
V + = 3V
V + = 5V
1.0
0.5
1.0 0 10 20 30 40 LOAD CURRENT (mA) 50 60
0
0
10
50 60 20 30 40 LOAD CURRENT (mA)
70
80
LTC1443/44/45 * TPC08
LTC1443/44/45 * TPC09
LTC1443/LTC1444/LTC1445 TYPICAL PERFOR A CE CHARACTERISTICS
Comparator Response Time vs Input Overdrive
OUTPUT VOLTAGE (V)
4 3 2 1 0
TA = 25C
OUTPUT VOLTAGE (V)
5 100mV 50mV 10mV 20mV
SINK CURRENT (mA)
INPUT VOLTAGE (mV)
INPUT VOLTAGE (mV)
0 100 -1 0 2 4 6 RESPONSE TIME (s) 8 10
LTC1443/44/45 * TPC10
Comparator Short-Circuit Source Current vs Supply Voltage
160 140 10 12
SOURCE CURRENT (mA)
100 80 60 40 20 0 0 1
OUT CONNECTED TO V - = GND = 0V
RESPONSE TIME (s)
120
3 SUPPLY VOLTAGE (V)
Supply Current vs Comparator Input Frequency
10000 10000
SUPPLY CURRENT (A)
RESPONSE TIME (s)
1000
100
10 COUT = 5pF 1 1 10 100 1k 10k INPUT FREQUENCY (Hz) 100k
UW
2
Comparator Response Time vs Input Overdrives
5 4 3 2 1 0 TA = 25C 100mV 50mV 20mV 10mV
200 180 160 140 120 100 80 60 40 20
Comparator Short-Circuit Sink Current vs Supply Voltage
TA = 25C
OUT CONNECTED TO V +
100 0 -1 0 2 4 6 8 10 12 14 16 18 RESPONSE TIME (s)
LTC1443/44/45 * TPC11
0
0
1
2
345678 SUPPLY VOLTAGE (V)
9
10
LTC1443/44/45 * TPC12
Comparator Response Time vs Load Capacitance
t PHL
8
6
t PLH
4
2 4 5 0 20 60 80 40 LOAD CAPACITANCE (nF) 100
LTC1443/44/45 * TPC13
LTC1443/44/45 * TPC14
Comparator Response Time at Low Supply Voltage
1000 20mV OVERDRIVE 100
COUT = 55pF COUT = 15pF
10
100mV OVERDRIVE
1 1 1.1 1.2 1.3 1.4 1.5 1.6 SUPPLY VOLTAGE (V)
LTC1443/44/45 * TPC16
LTC1329 * TPC15
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LTC1443/LTC1444/LTC1445
PI FU CTIO S
LTC1443 1 2 OUT B OUT A OUT C OUT D 16 15 1 2 OUT B OUT A LTC1444/LTC1445 OUT C OUT D 16 15
3
V+
-
4 5 IN A- IN A+
-
6 7 8 IN B - IN B+
REF
OUT B (Pin 1): Comparator B Output. (Open-drain output for LTC1444). Output can source up to 40mA (LTC1443, LTC1445) and sink 5mA. OUT A (Pin 2): Comparator A Output. (Open-drain output for LTC1444). Output can source up to 40mA (LTC1443, LTC1445) and sink 5mA. V+ (Pin 3): Positive Supply. IN A - (Pin 4): Inverting Input of Comparator A. Input common mode range from V - to V + - 1.3V. Input current typically 10pA at 25C. IN A + (Pin 5): Noninverting Input of Comparator A. Input common mode range from V - to V + - 1.3V. Input current typically 10pA at 25C. IN B - (Pin 6): Inverting Input of Comparator B. Input common mode range from V - to V + - 1.3V. Input current typically 10pA at 25C. IN B + (Pin 7): Noninverting Input of Comparator B. Input common mode range from V - to V + - 1.3V. Input current typically 10pA at 25C. REF (Pin 8): Reference Output. With respect to V -. Can source up to 200A and sink 15A at 25C. Drive 0.01F bypass capacitor without oscillation.
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GND
14
3
V+
HYST
14
+
-
+
IN D+ IN D- 13 12 4 5 IN A- IN A+
-
+
-
+
IN D+ IN D- 13 12
+
-
+
IN C+ IN C- 11 10 9 6 7 8 IN B - IN B+
-
+
-
+
IN C+ IN C- 11 10 9
1.182V V- REF
1.221V V-
1443/44/45 * PD01
1443/44/45 * PD02
V - (Pin 9): Negative Supply. Connect to ground for single supply operation on LTC1443. IN C - (Pin10): Inverting Input of Comparator C. Input common mode range from V - to V + - 1.3V. Input current typically 10pA at 25C. IN C + (Pin 11): Noninverting Input of Comparator C. Input common mode range from V - to V + - 1.3V. Input current typically 10pA at 25C. IN D - (Pin 12): Inverting Input of Comparator D. Input common mode range from V - to V + - 1.3V. Input current typically 10pA at 25C. IN D + (Pin 13): Noninverting Input of Comparator D. Input common mode range from V - to V + - 1.3V. Input current typically 10pA at 25C. GND (Pin 14): LTC1443 Ground. Connect to V - for single supply operation. HYST (Pin 14): LTC1444/LTC1445 Hysteresis Input. Connect to REF if not used. Input voltage range is from VREF to VREF - 50mV.
LTC1443/LTC1444/LTC1445
PI FU CTIO S
OUT D (Pin 15): Comparator D Output. (Open-drain output for LTC1444). Output can source up to 40mA (LTC1443, LTC1445) and sink 5mA. OUT C (Pin 16): Comparator C Output. (Open-drain output for LTC1444). Output can source up to 40mA (LTC1443, LTC1445) and sink 5mA.
APPLICATIO S I FOR ATIO
The LTC1443/LTC1444/LTC1445 is a family of quad micropower comparators with a built-in reference (1.182V for the LTC1443 and 1.221V for the LTC1444/LTC1445). Features include programmable hysteresis (LTC1444/ LTC1445), wide supply voltage range (2V to 11V) and the ability of the reference to drive up to a 0.01F capacitor without oscillation. The comparator CMOS outputs (LTC1443/LTC1445) can source up to 40mA while the LTC1444 has an open-drain output to V -. The supply current glitches that normally occur when the comparator output switches states have been eliminated. Power Supplies The comparator family operates from a single 2V to 11V supply. The LTC1443 includes a separate ground for the comparator output stage, allowing a split supply ranging from 1V to 5.5V. Connecting V - to GND on the LTC1443 allows single supply operation. If the comparator output is required to source more than 1mA or the supply source impedance is high, V + should be bypassed with a 0.1F capacitor. Comparator Inputs The comparator inputs can swing from the negative supply (V -) to within 1.3V maximum of the positive supply (V +). The inputs can be forced 300mV below V - or above V + without damage, and the typical input leakage current is only 10pA. Comparator Outputs The LTC1443 comparator output swings between GND and V + to assure TTL compatibility with a split supply. The LTC1444 and LTC1445 outputs swing between V - and V +. The outputs are capable of sourcing up to 40mA (LTC1443/ LTC1445) and sinking up to 5mA while still maintaining microampere quiescent currents. The output stage does not generate crowbar switching currents during transi-
RESISTOR VALUE (k)
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tions which helps minimize parasitic feedback through the supply pins. Voltage Reference The internal bandgap reference has a voltage of 1.182V for LTC1443 or 1.221V for LTC1444/LTC1445 referenced to V -. The reference accuracy is 1.5% from - 40C to 85C. It can source up to 200A and sink up to 15A with a 5V supply. The reference can drive a bypass capacitor of up to 0.01F without oscillation and by inserting a series resistor, capacitance values up to 100F can be used (Figure 1).
REFERENCE OUTPUT REF R1 LTC144X
C1
V-
LTC1443/44/45 * F01
Figure 1. Damping the Reference Output
Figure 2 shows the resistor value required for different capacitor values to achieve critical damping.
1000
100
10
1
0.1 0.001
0.01 0.1 1 CAPACITOR VALUE (F)
10
LTC1443/44/45 * F02
Figure 2. Damping Resistance vs Bypass Capacitor Value
7
LTC1443/LTC1444/LTC1445
APPLICATIO S I FOR ATIO
Bypassing the reference can help prevent false tripping of the comparators by preventing glitches on the V + or the reference output voltage. Figure 3 shows the bypassed reference output with a square wave applied to the V + pin. Resistors R1 and R2 set 10mV of hysteresis, while R3 damps the reference response. Note that the comparator output doesn't trip. Hysteresis Hysteresis can be added to the LTC1444/LTC1445 by connecting a resistor (R1) between the REF and HYST pins, and a second resistor (R2) from HYST to V - (Figure 4).
3 5V TO 8V V+ 5 IN A+
+
2 OUT
4 IN A- 14 HYST 8 R3 430 C1 1.0F REF
-
LTC1445 V- 9
2mV/DIV
R1 10k R2 2.4M
LTC1443/44/45 * F03
Figure 3a. V +
Glitching Test Circuit
IREF R1
R2 9
Figure 4. Programmable Hysteresis
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The difference between the upper and lower threshold voltages or hysteresis voltage band (VHB) is equal to twice the voltage difference between the REF and HYST pins. When more hysteresis is added, the upper threshold increases the same amount as the lower threshold decreases. The maximum voltage allowed between REF and HYST is 50mV, producing a maximum hysteresis voltage band of 100mV. If hysteresis is not wanted, the HYST pin should be shorted to REF. Acceptable values for IREF range from 0.1A to 5A. If 2.4M is chosen for R2, then R1(k) = VHB (mV).
8V V+ 5V VREF OUT 2ms/DIV
LTC1443/1444/1445 * TA02
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Figure 3b. V +
Glitching Response
8
REF LTC1445
R1 =
VHB (2)(IREF)
14 HYST R2 =
(
1.221V - IREF
VHB 2
)
LTC1443/44/45 * F04
LTC1443/LTC1444/LTC1445
APPLICATIO S I FOR ATIO
V2 R6 1.82M 1%
V1 R2 3.40M 1%
R7 1.21M 1% R1 1.21M 1% R3 15k, 1%
R4 2.4M 1%
Figure 5. Glitch-Free Level Detector with Hysteresis
Level Detector The LTC1444 is ideal for use as a multisupply micropower level detector as shown in Figure 5. R1 and R2 form a voltage divider from V1 to the noninverting comparator A input. R6 and R7 are used to divide down V2, while R8 is the output pull-up resistor for the comparator outputs. R3 and R4 set the hysteresis voltage and R5 and C1 bypass the reference output. The following design procedure can be used to select the component values: 1. Choose the V1 voltage trip level, in this example 4.65V. 2. Calculate the required resistive divider ratio. Ratio = VREF/VIN Ratio = 1.221V/4.65V = 0.263 3. Choose the required hysteresis voltage band at the input, VHBIN, in this example 60mV. Calculate the hysteresis voltage band referred to the comparator input VHB. VHB = (VHBIN)(Ratio) VHB = (60mV)(0.263) VHB = 15.78mV
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5V 3 V 7 IN B+
+
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R8 2M 1% OUT B 1
+ -
1/2LTC1444
- 6 IN B
5 IN A+
+
OUT A 2
- 4 IN A
-
14 HYST 8 R5 430 5% C1 1.0F REF V- 9
LTC1443/44/45 * F05
4. Choose the values for R3 and R4 to set the hysteresis. R4 = 2.4M R3(k) = VHB = 15k 5. Choose the values for R1 and R2 to set the trip point. R1 = VREF/IBIAS = 1.221V/1A 1.21M
VIN R2 = (R1) - 1 V VREF + HB 2 4.65V R2 = (1.21M) - 1 15mV 1.221V + 2 R2 = 3.40M
Using the same equations, R6 and R7 are 1.82M and 1.21M respectfully to set the trip level at 3V for V2.
9
LTC1443/LTC1444/LTC1445
PACKAGE DESCRIPTIO
0.300 - 0.325 (7.620 - 8.255)
0.009 - 0.015 (0.229 - 0.381)
(
+0.035 0.325 -0.015 8.255 +0.889 -0.381
)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
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Dimensions in inches (millimeters) unless otherwise noted.
N Package 16-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.770* (19.558) MAX 16 15 14 13 12 11 10 9
0.255 0.015* (6.477 0.381)
1
2
3
4
5
6
7
8
0.130 0.005 (3.302 0.127) 0.020 (0.508) MIN
0.045 - 0.065 (1.143 - 1.651)
0.065 (1.651) TYP 0.125 (3.175) MIN 0.018 0.003 (0.457 0.076)
0.100 (2.54) BSC
N16 1098
LTC1443/LTC1444/LTC1445
PACKAGE DESCRIPTIO
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0 - 8 TYP
0.016 - 0.050 (0.406 - 1.270) *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
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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Dimensions in inches (millimeters) unless otherwise noted.
S Package 16-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.386 - 0.394* (9.804 - 10.008) 16 15 14 13 12 11 10 9
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
1 0.053 - 0.069 (1.346 - 1.752)
2
3
4
5
6
7
8
0.004 - 0.010 (0.101 - 0.254)
0.014 - 0.019 (0.355 - 0.483) TYP
0.050 (1.270) BSC
S16 1098
11
LTC1443/LTC1444/LTC1445
TYPICAL APPLICATIO
R1 1.1M 5% R2 82.5k 1% 1 CELL LITHIUMION BATTERY
5
3 V A 1/4 LTC1444
+
+
2
4
- -
6 R3 1M 1% R5 51k 5% R4 2.4M 5%
R7 51k 5% 1
B 1/4 LTC1444 HYST 7
14
R6 430 5% C1 1F
8 REF LTC1444 REF 9 V-
C2, C3: AUX TPSD107M010R0100 OR SANYO OS-CON 16SA100M
RELATED PARTS
PART NUMBER LT 1034 LT1179 LTC1285/LTC1288 LT1389 LTC1440/LTC1441/LTC1442 LT1495 LT1521 LT1634
(R)
DESCRIPTION Micropower Dual Reference Quad Micropower Single Supply Precision Op Amp 3V Micropower Sampling 12-Bit ADCs Nanopower Precision Shunt Reference Ultralow Power Single/Dual Comparator with Reference Dual Precision Rail-to-Rail Input and Output Op Amp 300mA Low Dropout Regulator Micropower Precision Shunt Reference
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com
U
Single Cell to 5V Supply
L1 10H SUMIDA CD54-100 D1 1N5817
+
C2 100F
6 VIN
7 SW SENSE 4 1 3 2, 4 R8 732k 1% 11 R10 3.37M 5% 16 13 R11 51k 5% R12 51k 15 5% VCC NMI P RESET
3 5 2
SHDN LT1300 ILIM SEL PWR GND 8 GND 1 Q1 MMFT2955ETI C3 100F R9 267k 1%
+
NC NC
+
C 1/4 LTC1444 10
+
-
12 C4 0.22F
D 1/4 LTC1444
+
-
LTC1443/44/45 * F06
COMMENTS 1.2V or 2.5V with 7V Auxiliary Reference 17A Max per Amplifier SO-8 Package, Auto Shutdown to 1nA 800nA Operating Current, 0.05% Accuracy 2.8A Typical Quiescent Current 1.5A Max per Amplifier 12A Quiescent Current 10A Operating Current, 0.05% Accuracy
144345fa LT/TP 0100 2K REV A * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1995

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