LTC1841/LTC1842/LTC1843
Ultralow Power Dual
Comparators with Reference
U
DESCRIPTION
FEATURES
■
■
■
■
■
■
■
■
Ultralow Quiescent Current: 3.5µA Typ
Open-Drain Outputs Typically Sink
Greater Than 20mA
Wide Supply Range: (LTC1841)
Single: 2V to 11V
Dual: ±1V to ±5.5V
Input Voltage Range Includes the Negative Supply
Reference Output Drives 0.01µF Capacitor
Adjustable Hysteresis
12µs Propagation Delay with 10mV Overdrive
No Current Spike When Switching
The LTC ®1841/LTC1842/LTC1843 are ultralow power dual
comparators with built-in reference (LTC1842/LTC1843).
The comparators feature less than 5.7µA supply current
over temperature, a 1.182V ±1% reference, programmable hysteresis and open-drain outputs that sink current. The reference output can drive a bypass capacitor of
up to 0.01µF without oscillation.
The LTC1841 operates from a single 2V to 11V supply or
a dual ±1V to ±5.5V supply. The LTC1842/LTC1843
operate from a single 2.5V to 11V supply or a dual ±1.25V
to ±5.5V supply. The LTC1842/LTC1843 hysteresis is
easily programmed by using two resistors and the HYST
pin. The comparators’ input operates from the negative
supply to within 1.3V of the positive supply. The comparators’ output stage can typically sink greater than 20mA. By
eliminating the cross-conduction current that normally
happens when the comparators change logic states, power
supply glitches are eliminated.
U
APPLICATIONS
■
■
■
■
Battery-Powered System Monitoring
Threshold Detectors
Window Comparators
Oscillator Circuits
The LTC1841/LTC1842/LTC1843 are available in SO-8
packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATION
Single Li-Ion Cell to 5V Supply
R1
1.5M
C1
100µF
D1
5
7
–
4 IN B –
VCC
LTC1843
+
R2
100k
3 IN A+
+
OUT A 1
6 REF
6
VIN
OUT B 8
R3
1M
LTC1843 Supply Current
vs Supply Voltage
L1
10µH
R6
25k
–
OUTPUT
5V
600mA
SW
LT1302-5
Si9924DY
3
SHDN
IT
8
4
PGND SENSE
VC
GND
2
RC
20k
CC
0.0µF
TA = 25°C
7
+
1
C2
100µF
R7
500k
4
SUPPLY CURRENT (µA)
+
1-CELL
Li-Ion
BATTERY
3
2
1
LBO
1841/43 TA01
R4
20k
R5
1.1M
V–
2
HYST
5
C1, C2: SANYO OS-CON
D1: MOTOROLA MBRS130LT3
L1: COILTRONICS CTX10-3
0
0
2
6
8
4
SUPPLY VOLTAGE (V)
10
12
1841/43 TA02
1
LTC1841/LTC1842/LTC1843
W W
U
W
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Voltage
V + 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 ................................................ 12V to (V – – 0.3V)
Current
IN +, IN –, HYST ................................................. 20mA
REF ................................................................... 20mA
OUT .................................................................. 50mA
OUT Short-Circuit Duration (V + ≤ 5.5V) ...... Continuous
Power Dissipation ............................................. 500mW
Operating Temperature Range
LTC1841C/LTC1842C/LTC1843C ........... 0°C to 70°C
LTC1841I/LTC1842I/LTC1843I .......... – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
W
U
U
PACKAGE/ORDER INFORMATION
TOP VIEW
TOP VIEW
OUT A 1
V
–
IN A
+
2
8
7
OUT B
V
OUT A 1
8
OUT B
V– 2
7
V+
+
+
+
3
6
IN B
IN A – 4
5
IN B –
TOP VIEW
IN A
8
OUT B
2
7
V+
OUT A 1
V
–
+
3
6
REF
IN A
3
6
REF
IN B + 4
5
HYST
IN B – 4
5
HYST
S8 PACKAGE
8-LEAD PLASTIC SO
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 125°C/ W
TJMAX = 150°C, θJA = 125°C/ W
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 125°C/ W
ORDER PART
NUMBER
S8 PART
MARKING
ORDER PART
NUMBER
S8 PART
MARKING
ORDER PART
NUMBER
S8 PART
MARKING
LTC1841CS8
LTC1841IS8
1841
1841I
LTC1842CS8
LTC1842IS8
1842
1842I
LTC1843CS8
LTC1843IS8
1843
1843I
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
V + = 5V, V – = 0V, TA = 25°C unless otherwise noted.
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supply
V+
Supply Voltage Range
LTC1841
LTC1842/LTC1843
●
●
ICC
Supply Current
HYST = REF (Note 2)
●
2.0
2.5
11
11
V
V
3.5
5.7
µA
Comparator
VOS
Comparator Input Offset Voltage
(Note 3)
●
±3
±10
mV
IIN
Input Leakage Current (IN +, IN –)
IN +
●
±0.01
±1.0
nA
VIN
Comparator Input Voltage Range
V + – 1.3V
V
= IN – = 2.5V (LTC1841),
IN + = IN – = VREF (LTC1842/LTC1843)
●
PSRR
Power Supply Rejection Ratio
V + = 2V to 11V (LTC1841),
V + = 2.5V to 11V (LTC1842/LTC1843)
CMRR
Common Mode Rejection Ratio
VCM = V – to (V + – 1.3V) LTC1841
●
VHYST
Hysteresis Input Voltage Range
LTC1842/LTC1843
●
2
V–
VREF – 50mV
0.1
1
mV/V
0.1
1
mV/V
VREF
V
LTC1841/LTC1842/LTC1843
ELECTRICAL CHARACTERISTICS
V + = 5V, V – = 0V, TA = 25°C unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
tPD
Propagation Delay
COUT = 10pF, RPULL-UP = 100k Overdrive = 10mV
Overdrive = 100mV
ILEAK
Output Leakage Current
VOUT = 12V (Note 2)
VOL
Output Low Voltage
MIN
MAX
1
●
UNITS
µs
µs
12
4
●
IOUT = 1.8mA
TYP
100
nA
V – + 0.4V
V
Reference (LTC1842/LTC1843)
VREF
Reference Voltage
∆VREF Load Regulation
No Load
25°C
1.190
V
0°C to 70°C
●
1.170
1.174
1.194
V
– 40°C to 85°C
●
1.164
1.200
V
ISOURCE = 1mA
●
ISINK =10µA
1.182
1
3
mV
1.75
4
6
mV
mV
●
en
Voltage Noise
100Hz to 100kHz
µVRMS
100
V + = 3V, V – = 0V, TA = 25°C unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supply
V+
Supply Voltage Range
LTC1841
LTC1842/LTC1843
●
●
ICC
Supply Current
HYST = REF (Note 2)
●
2.0
2.5
11
11
V
V
3.5
5.5
µA
Comparator
VOS
Comparator Input Offset Voltage
(Note 3)
●
±3
±10
mV
IIN
Input Leakage Current (IN +, IN –)
IN + = IN – = 1.5V (LTC1841),
IN + = IN – = VREF (LTC1842/LTC1843)
●
±0.01
±1
nA
VIN
Comparator Input Voltage Range
V + – 1.3V
V
●
V–
PSRR
Power Supply Rejection Ratio
V + = 2V to 11V (LTC 1841),
V + = 2.5V to 11V (LTC1842/LTC1843)
CMRR
Common Mode Rejection Ratio
VCM = V – to (V + – 1.3V) LTC1841
●
VHYST
Hysteresis Input Voltage Range
LTC1842/LTC1843
● VREF – 50mV
tPD
Propagation Delay
COUT = 10pF, RPULL-UP = 100k Overdrive = 10mV
Overdrive = 100mV
ILEAK
Output Leakage Current
VOUT = 12V (Note 2)
VOL
Output Low Voltage
1
mV/V
0.1
1
mV/V
VREF
1
●
V
µs
µs
14
5
●
IO = 0.8mA
0.1
100
nA
V – + 0.4V
V
1.190
V
Reference (LTC1842/LTC1843)
VREF
Reference Voltage
∆VREF Load Regulation
No Load
25°C
1.174
1.182
0°C to 70°C
●
1.170
1.194
V
– 40°C to 85°C
●
1.164
1.200
V
ISOURCE = 1mA
●
ISINK =10µA
2
6
mV
1.75
4
6
mV
mV
●
en
Voltage Noise
100Hz to 100kHz
The ● denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
100
Note 2: IN +
µVRMS
= IN – + 80mV, output is in high impedance state.
Note 3: VCM = 1/2(V + – V –) for LTC1841, VCM = VREF for LTC1842/
LTC1843.
3
LTC1841/LTC1842/LTC1843
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Comparator Response Time vs
Input Overdrive, with RPULL-UP = 5k
3
100mV
OUTPUT VOLTAGE (V)
TA = 25°C
4
10mV
50mV
20mV
2
1
0
INPUT VOLTAGE (mV)
INPUT VOLTAGE (mV) OUTPUT VOLTAGE (V)
5
Comparator Response Time vs
Input Overdrive, with RPULL-UP = 5k
0
100
0
–1
2
4
6
RESPONSE TIME (µs)
8
10
5
TA = 25°C
4
100mV
50mV
3
20mV
10mV
2
1
0
100
0
–1
0
4 6 8 10 12 14 16 18
RESPONSE TIME (µs)
2
1440/1/2/3 G02
1440/1/2/3 G01
Comparator Response Time vs
Load Capacitance with 100mV
Input Overdrive
Comparator Short-Circuit Sink
Current vs Supply Voltage
12
200
TA = 25°C
180
10
140
RESPONSE TIME (µs)
SINK CURRENT (mA)
160
OUT CONNECTED TO V +
120
100
80
60
t PHL
8
t PLH
6
4
40
20
0
2
0
1
2
3 4 5 6 7 8
SUPPLY VOLTAGE (V)
9
20
0
10
60
80
40
LOAD CAPACITANCE (nF)
1440/1/2/3 G03
100
1440/1/2/3 G04
Comparator Response Time at
Low Supply Voltage
Comparator Output Voltage Low
vs Load Current
2.5
10000
OUTPUT VOLTAGE HIGH (V)
RESPONSE TIME (µs)
TA = 25°C
1000
20mV OVERDRIVE
100
10
100mV OVERDRIVE
1
1.1
1.2
1.3
1.4
SUPPLY VOLTAGE (V)
1.5
1.6
1440/1/2/3 G05
V + = 3V
V + = 2V
1.5
V + = 5V
1.0
0.5
0
1.0
4
2.0
0
10
50 60
20 30 40
LOAD CURRENT (mA)
70
80
1440/1/2/3 G06
LTC1841/LTC1842/LTC1843
U W
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1842/LTC1843
Supply Current vs Temperature
4.5
80
60
OUTPUT HIGH
4.0
40
SUPPLY CURRENT (µA)
POSITIVE-TO-NEGATIVE INPUT VOLTAGE (mV)
LTC1842/LTC1843
Hysteresis Control
20
0
OUTPUT LOW
–20
–40
V + = 5V
V – = –5V
3.5
3.0
V + = 5V
V – = 0V
V + = 3V
V – = 0V
2.5
–60
–80
0
10
20
30
VREF – VHYST (mV)
40
2.0
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
50
1440/1/2/3 G08
1440/1/2/3 G07
Reference Output Voltage vs
Output Load Current
Reference Output Voltage vs Output
Load Current (Sink)
1.190
1.200
REFERENCE OUTPUT VOLTAGE (V)
1.185
SOURCE
1.180
1.175
1.170
1.165
1.160
1.155
0
0.5 1.0 1.5 2.0 2.5 3.0
OUTPUT LOAD CURRENT (mA)
V CC = 2V
1.195
V CC = 5V
1.190
1.185
SINK
1.180
1.175
1.170
3.5
0
1841/2/3 G09
25
10
15
20
5
OUTPUT LOAD CURRENT (µA)
30
1440/1/2/3 G10
Reference Voltage vs
Temperature
1.186
1.184
REFERENCE VOLTAGE (V)
REFERENCE OUTPUT VOLTAGE (V)
VCC = 5V
1.182
1.180
1.178
1.176
1.174
1.172
1.170
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
1440/1/2/3 G11
5
LTC1841/LTC1842/LTC1843
U
U
U
PIN FUNCTIONS
OUT A (Pin 1): Comparator A Open-Drain Output. Output
can typically sink greater than 20mA.
V – (Pin 2): Negative Supply.
IN A+ (Pin 3): Noninverting Input of Comparator A. Input
common mode range extends from V – to V + – 1.3V. Input
current is typically 10pA at 25°C.
1 OUT A
2
V–
+
LTC1841
OUT B 8
V+
B
A
–
+
–
3 IN A+
IN B + 6
4 IN A–
IN B – 5
IN A – (Pin 4) (LTC1841): Inverting Input of Comparator A.
Input common mode range extends from V – to V + – 1.3V.
Input current is typically 10pA at 25°C.
IN B+ (Pin 4) (LTC1842): Noninverting Input of Comparator B. Input common mode range extends from V – to
V + – 1.3V. Input current is typically 10pA at 25°C.
IN B – (Pin 4) (LTC1843): Inverting Input of Comparator B.
Input common mode range extends from V – to V + – 1.3V.
Input current is typically 10pA at 25°C.
IN B – (Pin 5) (LTC1841): Inverting Input of Comparator B.
Input common mode range extends from V – to V + – 1.3V.
Input current is typically 10pA at 25°C.
HYST (Pin 5) (LTC1842/LTC1843): Hysteresis Input.
Connect to REF if not used. Input voltage range is from
VREF to VREF – 50mV.
IN B + (Pin 6) (LTC1841): Noninverting Input of Comparator B. Input common mode range extends from V – to
V + – 1.3V. Input current is typically 10pA at 25°C.
REF (Pin 6) (LTC1842/LTC1843): Reference Output.
1.182V with respect to V –. Can typically source greater
than 1mA and sink 10µA at 25°C. Can drive 0.01µF bypass
capacitor without oscillation.
V + (Pin 7) (LTC1841): Positive Supply. 2V to 11V.
V + (Pin 7) (LTC1842/LTC1843): Positive Supply. 2.5V to
11V.
OUT B (Pin 8): Comparator B Open-Drain Output. Output
can typically sink greater than 20mA.
6
7
1841 PD
1 OUT A
2
V–
LTC1842
V+
B
A
+
OUT B 8
–
+
7
–
3 IN A+
REF 6
HYST 5
V–
4 IN B +
1842 PD
1 OUT A
2
V–
LTC1843
–
3 IN A+
4 IN B –
V+
B
A
+
OUT B 8
–
7
+
REF 6
V–
HYST 5
1843 PD
LTC1841/LTC1842/LTC1843
U
W
U
U
APPLICATIONS INFORMATION
The LTC1841/LTC1842/LTC1843 are dual micropower
comparators with a built-in 1.182V reference (LTC1842/
LTC1843). Features include programmable hysteresis,
wide supply voltage range (2V to 11V) and the ability for
the reference to drive up to a 0.01µF capacitor without
oscillation. The comparators’ open-drain outputs can typically sink greater than 20mA and the supply current
glitches that normally occur when switching logic states
have been eliminated.
REFERENCE
OUTPUT
REF
R1
C1
LTC1843
V–
1841/43 F01
Figure 1. Damping the Reference Output
Power Supplies
The comparators operate from a single 2V to 11V (2.5V to
11V for LTC1842/LTC1843) or dual ±1V to ±5.5V supply
(±1.25V to ±5.5V for LTC1842/LTC1843). If the reference
output is required to source more than 1mA or the supply
source impedance is high, V + should be bypassed with a
0.1µF capacitor.
Figure 2 shows the resistor value required for different
capacitor values to achieve critical damping. Bypassing
the reference can help prevent false tripping of the comparators by preventing glitches on V + or reference load
transients from disturbing the reference output voltage.
Comparator Inputs
Comparator Outputs
Each comparator output is an open-drain pull-down to V –
typically capable of sinking greater than 20mA. The low
output leakage current while in three-state mode allows a
high value pull-up resistor to be used. The open-drain
outputs can be wire OR-ed or used in level shifting
applications.
100
RESISTOR VALUE (kΩ)
The comparators’ input can swing from the negative
supply V – to within 1.3V (max) of the positive supply V +.
The input can be forced 300mV below V – or above V +
without damage and the typical input leakage current is
only ±10pA.
10
1
0.1
0.001
0.01
0.1
1
CAPACITOR VALUE (µF)
10
1841/43 F02
Figure 2. Damping Resistance vs Bypass Capacitor Value
Voltage Reference
The internal bandgap reference has an output voltage of
1.182V referenced to V –. The reference accuracy is 1.5%
from – 40°C to 85°C. It can typically source greater than
1mA and sink up to 10µA with a 5V supply. The reference
can drive a bypass capacitor of up to 0.01µF without
oscillation. By inserting a series resistor, capacitance
values up to 100µF can be used (Figure 1).
Figure 3 shows the bypassed reference output with a
square wave applied to the V + pin. Resistors R2 and R3 set
a 10mV hysteresis voltage band while R1 damps the
reference response. Note that the comparator output
doesn’t trip.
7
LTC1841/LTC1842/LTC1843
U
U
W
U
APPLICATIONS INFORMATION
7
V+
3 IN A+
5V
1M
+
OUT A 1
R1 =
REF
LTC1843
R1
5
OUT A
–
5V
TO
8V
6
IREF
LTC1843
HYST
R2 =
V
R2
VHB
(2)(IREF)
(
1.182V –
VHB
2
)
IREF
–
2
5 HYST
1841/43 F04
R2
10k
R3
2.4M
6 REF
R1
430Ω
C1
1µF
Figure 4. Programmable Hysteresis
V–
2
1841/43 F03a
Figure 3a. Power Supply Transient Test Circuit
15%. If hysteresis is not wanted, the HYST pin should be
shorted to REF. Acceptable values for IREF range are from
0.1µA to 5µA. If 2.4M is chosen for R2, then the value of
R1 is equal to the value of VHB.
Window Detector
The LTC1843 is ideal for use as a micropower window
detector as shown in Figure 5. The values of R1, R2 and R3
are selected for a 4.5V undervoltage threshold and a 5.5V
overvoltage threshold. R4 and R5 set the hysteresis voltage. The following design procedure can be used to select
the component values:
8V
V+
2mV/DIV
5V
VREF
OUT
5V
2ms/DIV
1841/1843 F03b
VIN
7
Figure 3b. Power Supply Transient Rejection
R3
1M
V+
3 IN A+
LTC1843
1M
+
OUT A 1
–
Hysteresis
Hysteresis can be added to the LTC1842/LTC1843 by
connecting a resistor (R1) between the REF and HYST pins
and a second resistor (R2) from HYST to V – (Figure 4).
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.
As more hysteresis is added, the upper threshold increases the same amount as the low threshold decreases.
The maximum voltage allowed between REF and HYST
pins is 50mV, producing a maximum hysteresis voltage
band of 100mV. The hysteresis band may vary by up to
8
R2
62.2k
5 HYST
6 REF
+
R5
10k
OUT B 8
4 IN B–
R1
294k
–
R4
2.4M
VOTH = 5.5V
VUTH = 4.5V
V–
2
1841/43 F05
Figure 5. Dual Level Detector
LTC1841/LTC1842/LTC1843
U
U
W
U
APPLICATIONS INFORMATION
1. Choose the required hysteresis voltage band and
calculate values for R4 and R5 according to the formulas in the hysteresis section. In this example, ±5mV of
hysteresis has been added at the comparator input
(VH = VHB/2). Note that the hysteresis apparent at VIN
will be larger because of the input resistor divider.
2. Select R1. The leakage current into IN B – is under 1nA
so the current through R1 should exceed 100nA, to
ensure threshold accuracy. R1 values up to about 10M
can be used, but values in the 100k to 1M range are
usually easier to deal with. In this example choose
R1 = 294k.
3. Calculate R2 + R3. The overvoltage threshold should be
set at 5.5V. The design equation is as follows:
VUTH
– 1
R2 + R3 = R1
VREF + VH
5.5
= 294k
– 1
1.182 + 0.005
= 1.068M
4. Calculate R2. The undervoltage threshold should be set
at 4.5V. The design equation is as follows:
(
)V V –V
R2 = R1 + R2 + R3
(
REF
H
Choose R2 = 61.9k (1% standard value)
5. Calculate R3:
R3 = (R2 + R3) – R2
= 1.068M – 61.9k
= 1.006M
Choose R3 = 1M (1% standard value)
6. Verify the resistor values. The equations are as
follows, evaluated for the above example:
Overvoltage threshold:
(
VOTH = VREF + VH
) R1+ RR21+ R3
= 5.474V
Undervoltage threshold:
(
VUTH = VREF – VH
= 4.484V
) R1R+1R+2R+2R3
R5
where the hysteresis voltage VH = VREF
R4
( )
– R1
LTH
) 1.1824–.50.005 – 294k
= 294k + 1.068M
= 62.2k
9
LTC1841/LTC1842/LTC1843
U
TYPICAL APPLICATION
Battery Switchover Circuit
1N5818
WALL ADAPTER
9V
Si9433
LTC1474
STEP-DOWN
REGULATOR
7
4-CELL
BATTERY
130k
V+
1.1M
3 IN A+
LTC1842
OUT A 1
562k
–
4 IN B+
+
OUT B 8
6 REF
–
0.01µF
20k
V–
10
2.4M
1M
+
5 HYST
47k
1M
OUTPUT
3.3V
2
1842 TA01
LBO
LTC1841/LTC1842/LTC1843
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
8
7
6
5
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
1
0.010 – 0.020
× 45°
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
0.053 – 0.069
(1.346 – 1.752)
0°– 8° TYP
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
2
3
4
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
TYP
*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.
SO8 0996
11
LTC1841/LTC1842/LTC1843
U
TYPICAL APPLICATION
Low-Battery Load Disconnect and Charge Termination
Si9924DY
VIN
1-CELL
Li-Ion
BATTERY
7
V+
2.55M
4 IN B–
–
LTC1843
2M
OUT B 8
+
LBO
AT VIN = 3V
2M
453k
3 IN A+
1.2M
+
6 REF
FULL CHARGE
AT VIN = 4.2V
–
V–
10k
OUT A 1
HYST
2
5
1.2M
1841/43 TA03
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT 1178/LT1179
Dual/Quad 17µA Precision Single Supply Op Amps
70µV Max VOS, 5nA Max IBIAS
LT1351
Single 250µA, 3MHz, 200V/µs Op Amp with Shutdown
C-LoadTM Op Amp Stable Driving Any Capacitive Load
LT1352/LT1353
Dual/Quad 250µA, 3MHz, 200V/µs Op Amps
C-Load Op Amps Stable Driving Any Capacitive Load
LTC1440/LTC1540
Micropower Comparator with 1% Reference
1.182V ±1% Reference, ±10mV (Max) Input Offset
LTC1441/LTC1442
Micropower Dual Comparator with 1% Reference
1.182V ±1% Reference (LTC1442)
LTC1443/LTC1444/LTC1445
Micropower Quad Comparator with 1% Reference
LTC1443 Has 1.182V Reference, LTC1444/LTC1445 Have
1.221V Reference and Adjustable Hysteresis
LTC1474
Low Quiescent Current High Efficiency Step-Down
Switching Regulator
10µA Standby Current, 92% Efficiency, Space Saving 8-Pin
MSOP Package
LT1495
1.5µA Max, Dual Precision Rail-to-Rail
Input and Output Op Amp
375µV Max VOS, 250pA IBIAS, 25pA IOS
LT1521
300mA Low Dropout Regulator with Micropower
Quiescent Current and Shutdown
0.5V Dropout Voltage, 12µA Quiescent Current, Adjustable
Output 3V, 3.3V and 5V Fixed
LTC1541/LTC1542
Micropower Op Amp, Comparator and Reference
1.200V ±0.8% Reference (LTC1541) Op Amp Outputs Stable
with 1000pF Load
LT1634
Micropower Precision Shunt Voltage Reference
1.25V Output, 10µA Operating Current, 0.1% Initial Accuracy
10ppm/°C Max Drift
®
C-Load is a trademark of Linear Technology Corporation.
12
Linear Technology Corporation
184123f LT/TP 1298 4K • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 ● FAX: (408) 434-0507 ● www.linear-tech.com
LINEAR TECHNOLOGY CORPORATION 1998
工商网监
湘ICP备2023018690号
