adjustable reference in a 6-pin SOT-23 package that is
optimized for lithium-ion low battery detection circuits.
The LTC1998 features a voltage detection circuit with an
adjustable threshold voltage and hysteresis. The threshold
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.
A proprietary internal architecture maintains 1% thresh-
old voltage accuracy over temperature with low cost 1%
external resistors.
A separate power supply pin, V
LOGIC,
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.
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.
High Accuracy Trip Voltage: 1% Max Error Using
External 1% Resistors
Adjustable Threshold Voltage and Hysteresis
Quiescent Current: 2.5μA Typ
Output Swings Rail-to-Rail
Thresholds Programmable from 2.5V to 3.25V
Output State Guaranteed for V
BATT
≥1.5V
Low Profile (1mm) ThinSOT™ Package
APPLICATIONS
n
Lithium-Ion Battery-Powered Equipment
PDAs
Cell Phones
Handheld Instruments
Battery Packs
Pagers
Palm Top Computers
POS Terminals
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ThinSOT is
a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
BLOCK DIAGRAM
Threshold Voltage Error vs Temperature
BATT
V
LOGIC
1.1R
V
HYST.A
V
TH.A
1.2V
% ERROR
THRESHOLD
ADJUST
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
1998 BD
V
TH.A
SET BY 1%
EXTERNAL R,
THRESHOLD = 3V
R
BATTLO
V
TH.A
= 1V
THRESHOLD = 3V
V
TH.A
SHORTED
TO GROUND,
THRESHOLD = 2.5V
0
–45 –25
35
15
55
–5
TEMPERATURE (°C)
75
95
1998 TA02
1998fa
1
LTC1998
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
BATT 1
GND 2
V
TH.A
3
6
BATTLO
5 V
LOGIC
4 V
H.A
Total Supply Voltage (BATT or V
LOGIC
to GND)............6V
Voltage
V
TH.A
, V
H.A
....................... BATT + 0.3V to GND – 0.3V
BATTLO
..........................V
LOGIC
+ 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
S6 PACKAGE
6-LEAD PLASTIC SOT-23
T
JMAX
= 150°C,
θ
JA
= 250°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC1998CS6#PBF
LTC1998IS6#PBF
LEAD BASED FINISH
LTC1998CS6
LTC1998IS6
TAPE AND REEL
LTC1998CS6#TRPBF
LTC1998IS6#TRPBF
TAPE AND REEL
LTC1998CS6#TR
LTC1998IS6#TR
PART MARKING
LTTY
LTTY
PART MARKING
LTTY
LTTY
PACKAGE DESCRIPTION
6-Lead Plastic SOT-23
6-Lead Plastic SOT-23
PACKAGE DESCRIPTION
6-Lead Plastic SOT-23
6-Lead Plastic SOT-23
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
1998fa
2
LTC1998
ELECTRICAL CHARACTERISTICS
PARAMETER
Power Supply
Supply Voltage Range-BATT
Supply Voltage Range-V
LOGIC
Supply Current, V
BATT
= 3V,
V
TH.A
= 1.5V
Supply Current, V
BATT
= 5.5V,
V
TH.A
= 1.5V
Monitor
Threshold Accuracy
V
BATT.Th
= 2.5V, Pin 3 Shorted to Ground
V
BATT.Th
= 3V, Pin 3 Driven by Precision Voltage Source to 1V
LTC1998C
LTC1998I
V
BATT.Th
= 3V, V
TH.A
= 1V (Note 5)
Programmed with 1% Max External Resistors
LTC1998C
LTC1998I
V
BATT.Th
= 3.25V, Pin 3 Driven by Precision Voltage Source to 1.5V
LTC1998C
LTC1998I
V
BATT.Th
= 3.25V, V
TH.A
= 1.5V (Note 5)
Programmed with 1% Max External Resistors
LTC1998C
LTC1998I
Hysteresis Accuracy
Allowable Hysteresis Range (Note 2)
Propagation Delay
C
OUT
= 100pF
Overdrive = 10mV
Overdrive = 100mV
V
TH.A
≤ 1.5V
V
H.A
≤ 1.5V
I
OUT
= –1mA, V
LOGIC
≥ 1.5V
I
OUT
= 1mA, V
BATT
≥ 2V
I
OUT
= 0.25mA, V
BATT
= 1V
l
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
GND
= 0V, unless otherwise noted.
CONDITIONS
MIN
1.5
1
2.5
TYP
MAX
5.5
V
BATT
3.5
4.2
4.5
4.3
5.2
5.5
0.85
1
0.61
0.71
UNITS
V
V
μA
μA
μA
μA
μA
μA
%
%
%
%
T
A
= 25°C
LTC1998CS6
LTC1998IS6
T
A
= 25°C
LTC1998CS6
LTC1998IS6
l
l
l
l
3
0.6
0.8
0.5
0.6
l
l
l
l
0.8
0.9
0.6
0.7
1
1.1
0.65
0.85
%
%
%
%
l
l
l
l
l
0.9
1
–5
±5
10
350
150
0.01
0.01
V
LOGIC
– 0.3
1.1
1.3
5
750
%
%
mV
mV
mV
μs
μs
V
HYST
≤ 250mV
250mV ≤ V
HYST
≤ 750mV
Threshold Adjust Pin Leakage, I
TH.A
Hysteresis Adjust Pin Leakage, I
H.A
Output
BATTLO
High Voltage
BATTLO
Low Voltage
BATTLO
Low Voltage
1
1
nA
nA
V
0.2
0.3
V
V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
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
I just arrived and I'm sending you some information. If you find it useful, you can download it and take a look. Please take care of me in the future! :)
I don't know how to use it, so I didn't upload...
Hello everyone: I am modifying the config.bib file, but after the modification, the system cannot start. Let's see what's going on. Do I need to modify other files to modify config.bib? The original f...
The LED fan which is very popular in the market has a length of 42 cm and 224 lamp beads. The solution includes: the schematic diagram and layout of 2 boards and their BOM STM source code. The host co...
Mobile audio solutions Originally, it used a 50 *20*20 box with two 15W built-in5- inch speaker , powered by 4 2000MA /H lithium batteries , Main circuit : Stereo amplifier circuit , lithium battery c...
Keeping the heart environment compact and warm is beneficial in most cases, but it’s another story for electronic heart scanners. When GE Healthcare was designing a scanner that was said to be the fas...[Details]
Safety is the top priority in the production process, especially for dangerous operations. When the high-voltage line is shut down for maintenance, it is necessary to follow the regulations of powe...[Details]
As the price of readers and tags decreases and the global market expands, the application of radio frequency identification (RFID) is increasing day by day. Tags can be powered by readers (passive ...[Details]
Lithium-ion batteries have a high energy-to-weight and energy-to-volume ratio, no memory effect, can be recharged many times, have a long service life, and are becoming increasingly cheaper. A good...[Details]
The overcurrent and overheating coordinated protection technology implemented by polymer positive temperature coefficient devices (PPTC) can protect motors, controllers and electronic components in...[Details]
Designers of handheld products such as cell phones, digital cameras, MP3 players and personal digital assistants (PDAs) are continually challenged to deliver more functionality in a smaller form...[Details]
Electrocardiogram is an important means of diagnosing heart disease. However, due to various reasons, it is difficult to capture abnormal electrocardiograms with ordinary electrocardiographs. Although...[Details]
Murphy's Law tells us that "what can go wrong, will go wrong". In the testing or production process of video equipment, problems often occur when we least want them to happen and when it is leas...[Details]
introduction
With the improvement of social automation, human-computer interaction capabilities urgently need a major change, and develop in a direction that is more convenient to use and more...[Details]
Abstract
: This paper introduces the general structure of the driver under the currently popular open source embedded operating system μClinux, as well as the connection between the touch scr...[Details]
At present, ECG monitoring systems that mainly collect, analyze and diagnose ECG signals have been widely used, and have played a great role in the prevention and diagnosis of heart diseases.
...[Details]
Abstract:
A single pulse secondary radar reply processor implemented with EPLD. Its main functions include: reply frame pulse detection, reply information decoding, assembling reply inf...[Details]
With the rapid development of the automobile industry, the requirements for automobile control, communication and networking are becoming more and more complex. The new generation of electronic co...[Details]
"Where am I? Where am I going? Where is he/she? How far is he/she from me?..." Do you often have such questions like me? In fact, who can deny that these are questions that we often think about, ev...[Details]
More than 80% of the information humans receive from the outside world comes from vision, and about 10% comes from hearing. The provision of people's entertainment needs will naturally transition f...[Details]
RF/Wirelessly
京公网安备 11010802033920号
EEWORLD
