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| 型号： | LTC1998IS6#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/12页 |
| 文件大小： | 0K |
| 描述： | IC DETECT VOLT PR LOBATT SOT23-6 |
| 标准包装： | 500 |
| 功能： | 过压/欠压保护 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 1 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 供应商设备封装： | TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC1998IS6#PBF LTC1998IS6#PBF-ND |
LTC1998
2.5μA, 1% Accurate
SOT-23 Comparator and Voltage
Reference for Battery Monitoring
FEATURES
DESCRIPTION
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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 Pro?le (1mm) ThinSOT? Package
The LTC ? 1998 is a micropower comparator and a precision
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.
APPLICATIONS
A proprietary internal architecture maintains 1% thresh-
old voltage accuracy over temperature with low cost 1%
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Lithium-Ion Battery-Powered Equipment
external resistors.
PDAs
Cell Phones
Handheld Instruments
Battery Packs
Pagers
Palm Top Computers
POS Terminals
L , LT, LTC, LTM, Linear Technology and the Linear logo 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.
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.
BLOCK DIAGRAM
Threshold Voltage Error vs Temperature
BATT
1.0
0.9
1.1R
V LOGIC
0.8
0.7
V TH.A SET BY 1%
EXTERNAL R,
THRESHOLD = 3V
V HYST.A
V TH.A
THRESHOLD
ADJUST
R
1.2V
BATTLO
0.6
0.5
0.4
0.3
0.2
V TH.A = 1V
THRESHOLD = 3V
V TH.A SHORTED
TO GROUND,
THRESHOLD = 2.5V
0.1
1998 BD
0
–45 –25
–5
15
35
55
75
95
TEMPERATURE (°C)
1998 TA02
1998fb
1
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