LTC1998CS6#PBF Linear Technology, LTC1998CS6#PBF Datasheet

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LTC1998CS6#PBF

Manufacturer Part Number
LTC1998CS6#PBF
Description
Manufacturer
Linear Technology
Datasheet

Specifications of LTC1998CS6#PBF

Operating Temperature (min)
-40C
Operating Temperature (max)
85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
6
Lead Free Status / RoHS Status
Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC1998CS6#PBFLTC1998CS6
Manufacturer:
LT
Quantity:
10 000
Company:
Part Number:
LTC1998CS6#PBFLTC1998CS6
Manufacturer:
LT/凌特
Quantity:
20 000
Company:
Part Number:
LTC1998CS6#PBFLTC1998CS6#TR
Manufacturer:
LT
Quantity:
1 154
Company:
Part Number:
LTC1998CS6#PBFLTC1998CS6#TRPBF
Manufacturer:
LT/凌特
Quantity:
20 000
Company:
Part Number:
LTC1998CS6#PBFLTC1998CS6/TRPBF
Manufacturer:
LT
Quantity:
4 825
FEATURES
APPLICATIONS
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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.
BLOCK DIAGRAM
V
HYST.A
V
TH.A
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
Low Profi le (1mm) ThinSOT™ Package
Lithium-Ion Battery-Powered Equipment
PDAs
Cell Phones
Handheld Instruments
Battery Packs
Pagers
Palm Top Computers
POS Terminals
THRESHOLD
ADJUST
BATT
1.1R
R
1.2V
BATT
≥1.5V
SOT-23 Comparator and Voltage
Reference for Battery Monitoring
V
BATTLO
1998 BD
LOGIC
DESCRIPTION
The LTC
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 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.
®
1998 is a micropower comparator and a precision
Threshold Voltage Error vs Temperature
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–45
2.5µA, 1% Accurate
V
THRESHOLD = 3V
TH.A
–25
= 1V
–5
TEMPERATURE (°C)
15
V
TO GROUND,
THRESHOLD = 2.5V
TH.A
LOGIC,
35
SHORTED
V
EXTERNAL R,
THRESHOLD = 3V
TH.A
55
allows the battery-low
SET BY 1%
75
LTC1998
1998 TA02
95
1998fb
1

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LTC1998CS6#PBF Summary of contents

Page 1

... 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. BLOCK DIAGRAM BATT 1 ...

Page 2

... 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 ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LTC1998CS6#PBF LTC1998CS6#TRPBF LTC1998IS6#PBF LTC1998IS6#TRPBF LEAD BASED FINISH TAPE AND REEL LTC1998CS6 ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T PARAMETER CONDITIONS Power Supply Supply Voltage Range-BATT Supply Voltage Range-V LOGIC Supply Current 3V 25°C BATT 1.5V LTC1998CS6 TH.A LTC1998IS6 Supply Current, V ...

Page 4

LTC1998 TYPICAL PERFORMANCE CHARACTERISTICS Quiescent Supply Current vs Supply Voltage 3 25° LOGIC BATT 3 1.5V TH.A 2 TH.A 2.0 1.5 1.0 0.5 0 0.5 1.0 1.5 2.0 2.5 ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Output Low Voltage vs Load Current 0 25° LOGIC BATT T = 85° 25° –40° ...

Page 6

LTC1998 PIN FUNCTIONS 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. GND (Pin ...

Page 7

QUICK DESIGN GUIDE How to Calculate the External Resistor Values The LTC1998 is a low battery warning indicator and is es- pecially designed for monitoring the voltage of single-cell Lithium-Ion batteries. The LTC1998 compares its supply pin (BATT ...

Page 8

LTC1998 APPLICATIONS INFORMATION LOW BATTERY THRESHOLD VOLTAGE AND HYSTERESIS ADJUST Low Battery Threshold Voltage Adjustment, Pin 3 The low battery threshold voltage is the battery voltage which will trip the (BATTLO) pin high to low. It should be adjusted via ...

Page 9

APPLICATIONS INFORMATION Hysteresis Adjustment, Pin 4. 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 ...

Page 10

LTC1998 APPLICATIONS INFORMATION The calculation of the resistor values R1, R2 and R3 is quite straightforward and similar to the procedure outlined in the previous paragraph. Choose a value for the sum well ...

Page 11

... MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. S6 Package ...

Page 12

... GND IN 383k 909k 1% BATT H.A LOGIC R5 LTC1998 6.98k BATTLO V TH.A R6 WINDOW LOW THRESHOLD = 2.6V GND 76.8k HYSTERESIS = 10mV 2 1% WINDOW HIGH THRESHOLD = 3.1V HYSTERESIS = 10mV 1998 TA06 LT 0809 REV B • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2001 OUT 1998 TA04 1998fb ...

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