LTC1992 [Linear]
2.5uA, 1% Accurate SOT-23 Comparator and Voltage Reference for Battery Monitoring; 2.5uA ， 1 ％精度SOT- 23比较器和参考电压电池监控
| 型号： | LTC1992 |
| 厂家： | 
Linear |
| 描述： | 2.5uA, 1% Accurate SOT-23 Comparator and Voltage Reference for Battery Monitoring |
| 文件： | 总8页 (文件大小：145K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1998
2.5µA, 1% Accurate
SOT-23 Comparator and Voltage
Reference for Battery Monitoring
U
FEATURES
DESCRIPTIO
The LTC®1998 is a micropower comparator and a preci-
sion adjustable reference in a 6-pin SOT-23 package that
is optimized for lithium-ion low battery detection circuits.
■
High Accuracy Trip Voltage: 1% Max Error Using
External 1% Resistors
■
■
■
■
■
■
Adjustable Threshold Voltage and Hysteresis
Quiescent Current: 2.5µA Typ
The LTC1998 features a voltage detection circuit with an
adjustable threshold voltage and hysteresis. The thresh-
old voltage can be programmed from 2.5V to 3.25V with
two external resistors. A 10mV to 750mV hysteresis can
be added with a third external resistor.
Output Swings Rail-to-Rail
Thresholds Programmable from 2.5V to 3.25V
Output State Guaranteed for VBATT ≥ 1.5V
Low Profile (1mm) ThinSOTTM Package
U
Aproprietaryinternalarchitecturemaintains1%thresh-
old voltage accuracy over temperature with low cost 1%
external resistors.
APPLICATIO S
■
Lithium-Ion Battery-Powered Equipment
PDAs
Cell Phones
A separate power supply pin, VLOGIC, allows the battery-
low logic output to operate below the battery voltage,
allowing compatibility with low voltage microprocessors
without a pull-up resistor. Power supply glitches are
eliminated by preventing the cross-conducting current
which occurs when the output changes state.
Handheld Instruments
Battery Packs
Pagers
Palm Top Computers
POS Terminals
The LTC1998 operates with battery or supply voltages up
to 5.5V and its battery-low output is valid for battery
voltages above 1.5V.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
W
BLOCK DIAGRA
Threshold Voltage Error vs Temperature
1.0
0.9
BATT
1.1R
V
SET BY 1%
TH.A
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
V
LOGIC
EXTERNAL R,
THRESHOLD = 3V
V
HYST.A
V
= 1V
TH.A
THRESHOLD
ADJUST
THRESHOLD = 3V
R
BATTLO
V
V
SHORTED
TH.A
TH.A
TO GROUND,
THRESHOLD = 2.5V
1.2V
35
TEMPERATURE (°C)
75
95
–45 –25
–5
15
55
1998 BD
1998 G05
1998f
1
LTC1998
W W
U W
U
W
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ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
(Note 1)
ORDER PART
TOP VIEW
Total Supply Voltage (BATT or VLOGIC to GND) ......... 6V
Voltage
VTH.A, VH.A ........................... BATT + 0.3V to GND – 0.3V
BATTLO ........................ VLOGIC + 0.3V to GND – 0.3V
Operating Temperature Range (Note 3) ...–40°C to 85°C
Specified Temperature Range (Note 4)
LTC1998C ...........................................–40°C to 85°C
LTC1998I.............................................–40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
NUMBER
BATT 1
GND 2
6 BATTLO
LTC1998CS6
LTC1998IS6
5 V
LOGIC
V
TH.A
3
4 V
H.A
S6 PACKAGE
6-LEAD PLASTIC SOT-23
S6 PART MARKING*
LTTY
TJMAX = 150°C, θJA = 250°C/W
*The temperature grades are indentified by a label on the shipping container.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VGND = 0V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supply
Supply Voltage Range-BATT
●
●
1.5
1
5.5
V
V
Supply Voltage Range-V
V
BATT
LOGIC
Supply Current, V
TH.A
= 3V,
T = 25°C
LTC1998CS6
LTC1998IS6
2.5
3
3.5
4.2
4.5
µA
µA
µA
BATT
A
V
= 1.5V
●
●
Supply Current, V
= 1.5V
= 5.5V,
T = 25°C
4.3
5.2
5.5
µA
µA
µA
BATT
A
V
LTC1998CS6
LTC1998IS6
●
●
TH.A
Monitor
Threshold Accuracy
V
V
= 2.5V, Pin 3 Shorted to Ground
= 3V, Pin 3 Driven by Precision
0.6
0.8
0.85
1
%
%
BATT.Th
BATT.Th
●
LTC1998C
LTC1998I
●
●
0.5
0.6
0.61
0.71
%
%
Voltage Source to 1V
V
= 3V, V = 1V (Note 5)
LTC1998C
LTC1998I
●
●
0.8
0.9
1
1.1
%
%
BATT.Th
TH.A
Programmed with 1% Max External Resistors
V
= 3.25V, Pin 3 Diven by Precision
LTC1998C
LTC1998I
●
●
0.6
0.7
0.65
0.85
%
%
BATT.Th
Voltage Source to 1.5V
V
= 3.25V, V
= 1.5V (Note 5)
TH.A
LTC1998C
LTC1998I
●
●
0.9
1
1.1
1.3
%
%
BATT.Th
Programmed with1% Max External Resistors
Hysteresis Accuracy
V
≤ 250mV
●
●
–5
10
5
mV
mV
HYST
250mV ≤ V
≤ 750mV
±5
HYST
Allowable Hysteresis Range (Note 2)
Propagation Delay
●
750
mV
C
= 100pF, Overdrive = 10mV
Overdrive = 100mV
350
150
µs
µs
OUT
Threshold Adjust Pin Leakage, I
V
V
≤ 1.5V
●
●
0.01
0.01
1
1
nA
nA
TH.A
TH.A
Hysteresis Adjust Pin Leakage, I
Output
≤ 1.5V
H.A
H.A
BATTLO High Voltage
BATTLO Low Voltage
BATTLO Low Voltage
I
I
I
= –1mA
●
●
●
V
– 0.3
LOGIC
V
V
OUT
OUT
OUT
= 1mA, V
≥ 2V
0.2
BATT
= 0.25mA, V
= 1V
0.3
V
BATT
1998f
2
LTC1998
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Maximum allowable hysteresis depends on desired trip voltages.
See application notes for details.
Note 3: LTC1998C and LTC1998I are guaranteed functional over the
operating temperature range of –40°C to 85°C.
Note 4: The LTC1998C is guaranteed to meet specified performance from
0°C to 70°C. The LTC1998C is designed, characterized and expected to
meet specified performance from –40°C to 85°C but is not tested or QA
sampled at these temperatures. The LTC1998I is guaranteed to meet
specified performance from –40°C to 85°C.
Note 5: This parameter is not 100% tested.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Quiescent Supply Current vs
Supply Voltage
Quiescent Supply Current vs
Temperature
Threshold Voltage vs Threshold
Adjust Voltage
3.5
3.0
2.5
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
= V
= 3V
T
= 25°C
LOGIC
BATT
LOGIC
A
V
= V
BATT
V
= 1.5V
TH.A
V
= 0V
TH.A
V
= 1.5V
TH.A
1.5
0
0.5
1.0
–50 –30 –10
10
30
50
70
90
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
THRESHOLD ADJUST VOLTAGE (V)
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
1998 G03
1998 G02
1998 G01
Available Hysteresis vs
Threshold Voltage
Threshold Voltage Error vs
Temperature
Input Current vs Temperature
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
750
500
250
0
10000
1000
V
= 1.5V
IN
V
SET BY 1%
TH.A
EXTERNAL R,
THRESHOLD = 3V
V
= 1V
IN
100
V
= 0.5V
V
= 1V
IN
TH.A
THRESHOLD = 3V
10
1
V
SHORTED
TH.A
TO GROUND,
THRESHOLD = 2.5V
0.1
35
TEMPERATURE (°C)
75
95
–45 –25
–5
15
55
3.25
2.5
2.75
3.0
35 45 55 65 75 85 95 105 115 125
LOW BATTERY THRESHOLD VOLTAGE (V)
TEMPERATURE (°C)
1998 G05
1998 G04
1998 G06
1998f
3
LTC1998
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Output Low Voltage vs Load
Current
Output High Voltage vs Load
Current
Output Short-Circuit Current vs
Supply Voltage
120
100
80
60
40
20
0
0.6
0.4
0.2
0
0
–50
T
= 25°C
BATT
T
= 25°C
LOGIC
A
A
T
= 85°C
A
V
= V
V
= V
= 3V
LOGIC
BATT
T
= 25°C
A
T
= –40°C
T
= 85°C
A
A
SOURCE CURRENT,
BATTLO SHORTED TO GND
–100
–150
–200
–250
T
= –40°C
A
T
= 25°C
T
= 25°C
A
A
T
= –40°C
T
= 85°C
A
A
SINK CURRENT,
BATTLO SHORTED
T
= 25°C
LOGIC
A
BATT = 3V
BATT = 5V
TO V
V
= V
LOGIC
BATT
5
1
2
3
4
5
1
2
3
4
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
SUPPLY VOLTAGE (V)
OUTPUT SINK CURRENT (mA)
OUTPUT SOURCE CURRENT (mA)
1998 G07
1998 G08
1998 G09
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PI FU CTIO S
BATT (Pin 1): Battery Voltage to be monitored. Supply
current is also drawn from this pin. Board layout should
connect this pin to the battery(+) terminal, through a trace
that does not conduct load current.
VH.A (Pin 4): Hysteresis Adjust. Hysteresis threshold
voltage VTH2 = 2.5V + (VH.A/2). VH.A can be supplied by a
voltage source or resistor divider. VH.A must always be
programmed to a higher potential than VTH.A. Hysteresis
voltage, VHYST = VTH2 – VBATT.Th
.
GND (Pin 2): Ground should be connected to the battery
(–) terminal through a trace that does not conduct load
return current.
VLOGIC (Pin 5): Positive Supply Voltage for Output Driver.
This voltage can be driven from an external logic supply or
tied to BATT.
VTH.A (Pin 3): Threshold Adjust Pin. Adjusts the low
battery threshold voltage, VBATT.Th = 2.5V + (VTH.A/2).
VTH.A can be supplied by a voltage source or a resistor
divider.
BATTLO (Pin 6): Output of Comparator. Low for BATT <
VBATT.Th (low battery threshold voltage). Output state
guaranteed for VBATT ≥ 1.5V.
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QUICK DESIG GUIDE
How to Calculate the External Resistor Values
threshold voltage of the LTC1998, the battery low pin
(BATTLO) will change state, from high to low, to indicate
a low battery condition. The low battery threshold voltage
isprogrammedviathevoltagethresholdadjustpin(VTH.A).
A hysteresis adjust pin (VH.A) will add hysteresis to the
programmed value of the low battery threshold voltage.
The LTC1998 is a low battery warning indicator and is
especially designed for monitoring the voltage of single-
cell Lithium-Ion batteries. The LTC1998 compares its
supply pin (BATT) to an accurate internal reference; if the
battery voltage falls below the programmed low battery
1998f
4
LTC1998
U
QUICK DESIG GUIDE
Typical Application
Example 1: A system using a 4.2V (fully charged) Lithium-
Ion battery requires a low battery threshold of 2.7V,
100mV hysteresis and can allow up to 4.2µA maximum
resistor current.
Table 1: Design Equations for R1, R2, R3, Figure 1
Choose desired values for:
• VBATT.Th: Low Battery Threshold Voltage
• VHYST: Hysteresis Voltage
• IR: Max Allowable Resistor Current
Solve:
RTOTAL = 1MΩ, R1 = 786k, R2 = 66k and R3 = 148k
Choose standard 1% values.
R1 = 787k, R2 = 66.5k, R3 = 147k
V
LOGIC
1.5V TO 4.2V
REGULATOR
0.1µF
4.2V
RTOTAL = R1+R2 +R3 =
IR
R1
1
+
1%
BATT
5
6
4
3
V
V
LOGIC
H.A
R2
1%
5V
µP
LTC1998
BATTLO
R1= RTOTAL
R2 = RTOTAL
•
– 1
V
BATT.Th + VHYST
V
TH.A
GND
2
R3
1%
5V
•
– 1 – R1
1998 F01
VBATT.Th
R3 = RTOTAL – R1– R2
Figure 1. Low Battery Threshold Detector with Hysteresis
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APPLICATIO S I FOR ATIO
LOW BATTERY THRESHOLD VOLTAGE AND
HYSTERESIS ADJUST
For instance, if the applied voltage at pin 3, VTH.A, is 1V the
LTC1998 will indicate a low battery condition when the
battery voltage pin (BATT) falls below 3V.
Low Battery Threshold Voltage Adjustment, Pin 3
The voltage at the threshold adjust pin (VTH.A) can be set
with any voltage source. This pin allows a continuous time
adjustment, that is, the low battery threshold voltage may
be changed at any time. The high input impedance of the
VTH.A pin allows the use of a high valued resistive divider
(to minimize current drain) from the battery to set the
battery low threshold voltage, Figure 2.
The low battery threshold voltage is the battery voltage
which will trip the (BATTLO) pin high to low. It should be
adjusted via the threshold adjust pin (VTH.A). This is a high
input impedance pin that senses an externally applied
voltage and programs the low battery threshold voltage
(VBATT.Th). The VTH.A pin is designed to accommodate
voltages from 0V to 1.5V with respect to ground. This
allows the low battery threshold voltage to be set to any
voltage between 2.5V and 3.25V, that is:
1
+
BATT
R1
3
V
TH.A
(VTH.A
2
)
LTC1998
2
R2
VBATT.Th = 2.5V +
1998 F02
Figure 2. Resistor Divider Sets Threshold
1998f
5
LTC1998
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APPLICATIO S I FOR ATIO
The simple calculations of resistor values R1 and R2 are
illustrated below. Set a value for R1 + R2. This value will
affect the max amount of current drawn from the battery
when fully charged. For instance if R1 + R2 = 1M the
resistive divider will draw 4.1µA when the battery voltage
is 4.1V.SetthedesiredvalueofVBATT.Th (thisvalueshould
be between 2.5V and 3.25V) that is the value of the battery
voltage that will trip the internal circuitry of the LTC1998
and change the state of the battery low pin (BATTLO).
The programming of the hysteresis threshold adjust pin
(VH.A) is similar to the programming of the voltage thresh-
old adjust pin (VTH.A) already described in the previous
paragraph. Pin 4 effectively adjusts the threshold voltage
at which the low battery pin (BATTLO) changes state from
low to high. This threshold (VTH2) is defined as:
(VH.A
2
)
VTH2 = 2.5V +
The actual hysteresis voltage is:
VHYST = VTH2 – VBATT.Th
5V
VBATT.Th
Solve for R1= (R1+R2)
– 1
Itisimperativethatthehysteresisthresholdadjustvoltage
at Pin 4 be set to a higher voltage than the low battery
threshold adjust voltage at Pin 3, at all times, to avoid
oscillation at the BATTLO output pin. The hysteresis
threshold adjust pin may be set with a voltage source or
with a resistor divider, just as with the low battery thresh-
old adjust pin.
Example: A Lithium-Ion battery is monitored and a battery
low signal should be issued when it discharges to 2.85V,
that is, VBATT.Th = 2.85V; if (R1 + R2) = 1M, then
R1 = 754.38k and R2 = 245.62k. Choose the closest 1%
value of R1 = 750k and R2 = 243k. Calculate the practical
valueforVBATT.Th asitwillbeslightlydifferentfrom2.85V,
due to the use of standard 1% resistor values.
Combined Control of Threshold and Hysteresis
R1+ R2
R1+ (R1+R2)
VBATT.Th = 5V
= 2.849V
If a resistor divider is desired, then both threshold adjust
dividers can be combined in order to save current. This
simpletechniquealsoguaranteesthatthehysteresisthresh-
old adjust voltage at Pin 4 is higher than the voltage at the
VTH.A pin, Figure 3.
The above low battery threshold of 2.849V is guaranteed
to within 1% even though 1% resistors are used to
program the VTH.A voltage applied to Pin 3.
For sake of completeness, the voltage at Pin 3 (VTH.A) can
be easily calculated by VTH.A = VBATT.Th (R2/(R1 + R2) =
0.6972V (when VBATTERY = VBATT.Th).
R1
R2
R3
1
+
BATT
4
3
V
H.A
LTC1998
Hysteresis Adjustment, Pin 4.
V
TH.A
The LTC1998 has an adjustable hysteresis ranging from
10mV to 0.75V. A large hysteresis is useful in the event
that a low battery signal at the LTC1998’s BATTLO pin
causes the system to shed some battery load, thus induc-
ingsystemconfusionasthepartiallyloadedbatteryrecov-
ers and changes the status of Pin 6 (BATTLO). The 2.5V to
3.25V programming window of low battery threshold
voltage includes the hysteresis. If, for instance, the low
battery threshold voltage is set to 2.5V, 750mV hysteresis
can be added on top of the 2.5V. If the low battery
threshold voltage is set to 3.15V, only 100mV hysteresis
can be applied.
1998 F03
Figure 3. Combined Resistor Divider
The calculation of the resistor values R1, R2 and R3 is
quite straightforward and similar to the procedure out-
lined in the previous paragraph.
Choose a value for the sum of R1 + R2 + R3 as well as the
values for low battery threshold and hysteresis.
Solve for resistor R1:
1998f
6
LTC1998
W U U
APPLICATIO S I FOR ATIO
U
has a separate supply pin, (VLOGIC) that can be used to
provide an output voltage rail matching the VDD logic of
microprocessors. The VLOGIC pin may be tied to a voltage
lower than the voltage at the BATT pin. The VLOGIC pin may
also be tied to a voltage higher than VBATT via a series
resistor greater than 10kΩ. The output will then act as an
open-drain device.
5V
VTH2
R1= (R1+R2 +R3)
– 1
Solve for the sum of
5V
VBATT.Th
(R1+R2) = (R1+R2 +R3)
– 1
In a given application, if it is possible for BATTLO to be
shorted to GND or a supply, a series resistor should be
added to limit the short-circuit current to 5mA.
then solve for R2 and R3.
Example:Asystemneedstodetectalowbatteryvoltageof
3V (VBATT.Th = 3V) with 250mV hysteresis (VTH2 = 3.25V).
Set the value of the resistor divider (R1 + R2 + R3) = 1M.
3.25V
PROGRAMMED
HYSTERESIS
HYSTERESIS
R1 = 539k, R1 + R2 = 667k, R2 = 128k, R3 = 333k. Choose
the closest 1% values, that is 536k, 332k, 127k. Figure 4
graphically shows the function of the LTC1998 as
described above.
THRESHOLD
PROGRAMMABLE
THRESHOLD RANGE
PROGRAMMED
LOW BATT
THRESHOLD
BATTERY VOLTAGE
RECOVERS UNDER
REDUCED LOAD
2.50V
BATTERY
VOLTAGE
VERSATILE OUTPUT DRIVER
V
LOGIC
V
LOGIC, BATTLO (Pins 5,6)
BATTLO
TheLTC1998usesaCMOSpush-pulloutputstagetodrive
the low battery output signal. This output pin (BATTLO)
1998 F04
Figure 4. LTC1998 Function Plot
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PACKAGE DESCRIPTIO
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
2.90 BSC
(NOTE 4)
0.62
MAX
0.95
REF
1.22 REF
1.50 – 1.75
(NOTE 4)
2.80 BSC
1.4 MIN
3.85 MAX 2.62 REF
PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45
6 PLCS (NOTE 3)
0.95 BSC
NOTE:
0.20 BSC
DATUM ‘A’
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
0.01 – 0.10
1.00 MAX
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD
FLASH AND METAL BURR
0.80 – 0.90
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
0.30 – 0.50 REF
1.90 BSC
0.09 – 0.20
(NOTE 3)
S6 TSOT-23 0302
1998f
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 represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
7
LTC1998
U
TYPICAL APPLICATIO S
Backup Battery Switchover Circuit
Single Li-Ion Cell Low Battery Detector
V
=
MBRM120
V
=
LOGIC
1V TO 5V
BATT
1.5V TO 4.2V
2.5V TO 4.2V
V
OUT
REGULATOR
R1
787k
1%
BAT54C
R4
1M
0.1µF
1
R1
1%
1
Si2301
+
+
BATT
V
LOGIC
BATT
5
6
4
5
4
V
V
H.A
V
H.A
V
LOGIC
R2
Si2301
R2
1%
LTC1998
BATTLO
µP
68.1k
LTC1998
BATTLO
1%
BAT54C
3
3
6
TH.A
V
TH.A
R3
147k
1%
3V
BACKUP
BATTERY
GND
2
+
GND
2
R3
1%
1998 TA01
SWITCHES TO BACKUP BATTERY WHEN PRIMARY FALLS BELOW 2.7V.
SWITCHES BACK TO PRIMARY WHEN VOLTAGE RECOVERS TO ≥ 2.8V
1998 TA04
Micropower 2.9V VCC Threshold
Detector with 15mV Hysteresis
3.3V
High Accuracy Window Comparator
with Dual Hysteresis
R1
715k
1%
1
+
V
V
IN
BATT
V
LOGIC
5
6
4
3
V
V
H.A
R2
9.09k
1%
R1
619k
1%
LTC1998
BATTLO
1
R7
1M
BATT
V
LOGIC
5
6
4
3
OUT
TH.A
V
V
H.A
R3
274k
1%
GND
2
R2
6.04k
1%
V
OUT
LTC1998
BATTLO
+
2N7002
TH.A
V
= V WHEN
IN
OUT
R3
383k
1%
LOW THRESHOLD = 2.9V
HYSTERESIS = 15mV
2.6V ≤ V ≤ 3.1V
GND
2
1998 TA03
Low Battery Load Reduction Circuit
R4
909k
1%
1
REGULATOR
BATT
V
LOGIC
5
6
4
3
R1
787k
1%
NC
V
V
H.A
Si2301
1
R5
6.98k
1%
+
BATT
V
LTC1998
BATTLO
5
6
4
3
CRITICAL
CIRCUITRY
V
V
H.A
LOGIC
R2
TH.A
LTC1998
BATTLO
68.1k
1%
R6
76.8k
1%
WINDOW LOW THRESHOLD = 2.6V
HYSTERESIS = 10mV
GND
2
TH.A
WINDOW HIGH THRESHOLD = 3.1V
NONCRITICAL
CIRCUITRY
R3
147k
1%
GND
2
HYSTERESIS = 10mV
1998 TA06
LOW THRESHOLD = 2.7V
HYSTERESIS = 100mV
1998 TA05
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC1440/LTC1540
LTC1441/LTC1442
Micropower Comparator with 1% Reference
1.182V ±1% Reference, ±10mV (Max) Input Offset
1.182V ±1% Reference (LTC1442)
Micropower Dual Comparator with 1% Reference
LTC1443/LTC1444/LTC1445 Micropower Quad Comparator with 1% Reference LTC1443 has 1.182V Reference, LTC1444/LTC1445 have 1.221V
Reference and Adjustable Hysteresis
1998f
LT/TP 0802 2K • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
8
●
●
LINEAR TECHNOLOGY CORPORATION 2001
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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