Datasheet LTC1998 (Analog Devices) - 12
| Fabricante | Analog Devices |
| Descripción | 2.5µA, 1% Accurate SOT-23 Comparator and Voltage Reference for Battery Monitoring |
| Páginas / Página | 12 / 12 — TYPICAL APPLICATIONS. Single Li-Ion Cell Low Battery Detector. Backup … |
| Formato / tamaño de archivo | PDF / 139 Kb |
| Idioma del documento | Inglés |
TYPICAL APPLICATIONS. Single Li-Ion Cell Low Battery Detector. Backup Battery Switchover Circuit
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LTC1998
TYPICAL APPLICATIONS Single Li-Ion Cell Low Battery Detector Backup Battery Switchover Circuit
V V MBRM120 BATT = LOGIC = 2.5V TO 4.2V 1.5V TO 4.2V 1V TO 5V VOUT REGULATOR R1 BAT54C 0.1μF 1 R1 1 787k R4 + Si2301 + 1% 1% BATT 4 BATT 5 1M 4 5 V V H.A VLOGIC VH.A LOGIC R2 R2 μP 68.1k Si2301 LTC1998 LTC1998 1% Li-Ion Li-Ion 1% 3 6 BAT54C 3 6 V BATTLO BATTLO TH.A VTH.A R3 GND + 3V R3 GND 147k BACKUP 2 1% 2 1% BATTERY 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 1 715k VIN V+ 1% 4 BATT 5 VH.A VLOGIC R2 R1 1 9.09k LTC1998 619k R7 1% 1% 1M 3 6 4 BATT 5 V BATTLO OUT TH.A VH.A VLOGIC R3 R2 GND 274k 6.04k LTC1998 VOUT 2 1% 1% 3 6 V BATTLO TH.A 2N7002 VOUT = V+ WHEN R3 GND 2.6V ≤ V LOW THRESHOLD = 2.9V IN ≤ 3.1V 383k HYSTERESIS = 15mV 1998 TA03 2 1%
Low Battery Load Reduction Circuit
R4 1 909k 1% REGULATOR 4 BATT 5 R1 VH.A VLOGIC NC 1 Si2301 787k R5 + LTC1998 1% 6.98k BATT 4 5 CRITICAL V 1% H.A VLOGIC 3 6 CIRCUITRY V BATTLO R2 TH.A R6 WINDOW LOW THRESHOLD = 2.6V 68.1k LTC1998 GND Li-Ion 76.8k HYSTERESIS = 10mV 1% 3 6 2 V BATTLO 1% WINDOW HIGH THRESHOLD = 3.1V TH.A R3 NONCRITICAL HYSTERESIS = 10mV GND 1998 TA06 147k CIRCUITRY 2 1% LOW THRESHOLD = 2.7V 1998 TA05 HYSTERESIS = 100mV
RELATED PARTS PART NUMBER DESCRIPTION COMMENTS
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 1998fb 12 Linear Technology Corporation LT 0809 REV B • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2001
TYPICAL APPLICATIONS Single Li-Ion Cell Low Battery Detector Backup Battery Switchover Circuit
V V MBRM120 BATT = LOGIC = 2.5V TO 4.2V 1.5V TO 4.2V 1V TO 5V VOUT REGULATOR R1 BAT54C 0.1μF 1 R1 1 787k R4 + Si2301 + 1% 1% BATT 4 BATT 5 1M 4 5 V V H.A VLOGIC VH.A LOGIC R2 R2 μP 68.1k Si2301 LTC1998 LTC1998 1% Li-Ion Li-Ion 1% 3 6 BAT54C 3 6 V BATTLO BATTLO TH.A VTH.A R3 GND + 3V R3 GND 147k BACKUP 2 1% 2 1% BATTERY 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 1 715k VIN V+ 1% 4 BATT 5 VH.A VLOGIC R2 R1 1 9.09k LTC1998 619k R7 1% 1% 1M 3 6 4 BATT 5 V BATTLO OUT TH.A VH.A VLOGIC R3 R2 GND 274k 6.04k LTC1998 VOUT 2 1% 1% 3 6 V BATTLO TH.A 2N7002 VOUT = V+ WHEN R3 GND 2.6V ≤ V LOW THRESHOLD = 2.9V IN ≤ 3.1V 383k HYSTERESIS = 15mV 1998 TA03 2 1%
Low Battery Load Reduction Circuit
R4 1 909k 1% REGULATOR 4 BATT 5 R1 VH.A VLOGIC NC 1 Si2301 787k R5 + LTC1998 1% 6.98k BATT 4 5 CRITICAL V 1% H.A VLOGIC 3 6 CIRCUITRY V BATTLO R2 TH.A R6 WINDOW LOW THRESHOLD = 2.6V 68.1k LTC1998 GND Li-Ion 76.8k HYSTERESIS = 10mV 1% 3 6 2 V BATTLO 1% WINDOW HIGH THRESHOLD = 3.1V TH.A R3 NONCRITICAL HYSTERESIS = 10mV GND 1998 TA06 147k CIRCUITRY 2 1% LOW THRESHOLD = 2.7V 1998 TA05 HYSTERESIS = 100mV
RELATED PARTS PART NUMBER DESCRIPTION COMMENTS
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 1998fb 12 Linear Technology Corporation LT 0809 REV B • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2001