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FEATURES
n n n n n n n
LTC1998 2.5A, 1% Accurate SOT-23 Comparator and Voltage Reference for Battery Monitoring DESCRIPTION
The LTC(R)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. A proprietary internal architecture maintains 1% threshold voltage accuracy over temperature with low cost 1% external resistors. 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. 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: 2.5A Typ 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
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 VLOGIC 1.1R VHYST.A VTH.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
VTH.A SET BY 1% EXTERNAL R, THRESHOLD = 3V
R
BATTLO
VTH.A = 1V THRESHOLD = 3V VTH.A SHORTED TO GROUND, THRESHOLD = 2.5V
0 -45 -25
35 15 55 -5 TEMPERATURE (C)
75
95
1998 TA02
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LTC1998 ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW BATT 1 GND 2 VTH.A 3 6 BATTLO 5 VLOGIC 4 VH.A
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).... -40C to 85C Specified Temperature Range (Note 4) LTC1998C ............................................ -40C to 85C LTC1998I.............................................. -40C to 85C Storage Temperature Range................... -65C to 150C Lead Temperature (Soldering, 10 sec) .................. 300C
S6 PACKAGE 6-LEAD PLASTIC SOT-23 TJMAX = 150C, JA = 250C/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 -40C to 85C -40C to 85C TEMPERATURE RANGE -40C to 85C -40C to 85C
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/
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LTC1998 ELECTRICAL CHARACTERISTICS
PARAMETER Power Supply Supply Voltage Range-BATT Supply Voltage Range-VLOGIC Supply Current, VBATT = 3V, VTH.A = 1.5V Supply Current, VBATT = 5.5V, VTH.A = 1.5V Monitor Threshold Accuracy VBATT.Th = 2.5V, Pin 3 Shorted to Ground VBATT.Th = 3V, Pin 3 Driven by Precision Voltage Source to 1V LTC1998C LTC1998I VBATT.Th = 3V, VTH.A = 1V (Note 5) Programmed with 1% Max External Resistors LTC1998C LTC1998I VBATT.Th = 3.25V, Pin 3 Driven by Precision Voltage Source to 1.5V LTC1998C LTC1998I VBATT.Th = 3.25V, VTH.A = 1.5V (Note 5) Programmed with 1% Max External Resistors LTC1998C LTC1998I Hysteresis Accuracy Allowable Hysteresis Range (Note 2) Propagation Delay COUT = 100pF Overdrive = 10mV Overdrive = 100mV VTH.A 1.5V VH.A 1.5V IOUT = -1mA, VLOGIC 1.5V IOUT = 1mA, VBATT 2V IOUT = 0.25mA, VBATT = 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 TA = 25C. VGND = 0V, unless otherwise noted.
CONDITIONS MIN 1.5 1 2.5 TYP MAX 5.5 VBATT 3.5 4.2 4.5 4.3 5.2 5.5 0.85 1 0.61 0.71 UNITS V V A A A A A A % % % %
TA = 25C LTC1998CS6 LTC1998IS6 TA = 25C 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 VLOGIC - 0.3
1.1 1.3 5 750
% % mV mV mV s s
VHYST 250mV 250mV VHYST 750mV
Threshold Adjust Pin Leakage, ITH.A Hysteresis Adjust Pin Leakage, IH.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 -40C to 85C.
Note 4: The LTC1998C is guaranteed to meet specified performance from 0C to 70C. The LTC1998C is designed, characterized and expected to meet specified performance from -40C to 85C but is not tested or QA sampled at these temperatures. The LTC1998I is guaranteed to meet specified performance from -40C to 85C. Note 5: This parameter is not 100% tested.
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LTC1998 TYPICAL PERFORMANCE CHARACTERISTICS
Quiescent Supply Current vs Supply Voltage
3.5 3.0 SUPPLY CURRENT (A) 2.5 2.0 1.5 1.0 0.5 0 0.5 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)
1998 G01
Quiescent Supply Current vs Temperature
3.5 3.0 2.5 VTH.A = 1.5V 2.0 1.5 1.0 0.5 0 -50 2.5 THRESHOLD VOLTAGE (V) SUPPLY CURRENT (A) VBATT = VLOGIC = 3V 3.5
Threshold Voltage vs Threshold Adjust Voltage
TA = 25C VLOGIC = VBATT VTH.A = 1.5V VTH.A = 0V
3.0
-30
-10 10 30 50 TEMPERATURE (C)
70
90
0
0.5 1.0 THRESHOLD ADJUST VOLTAGE (V)
1.5
1998 G03
1998 G02
Available Hysteresis vs Threshold Voltage
750 1.0 0.9 AVAILABLE HYSTERESIS (mV) 0.8 500 % ERROR 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 2.5 3.25 2.75 3.0 LOW BATTERY THRESHOLD VOLTAGE (V)
1998 G04
Threshold Voltage Error vs Temperature
10000 VTH.A SET BY 1% EXTERNAL R, THRESHOLD = 3V INPUT CURRENT VTH.A, VH.A (pA)
Input Current vs Temperature
VIN = 1.5V 1000
100
VIN = 1V VIN = 0.5V
VTH.A = 1V THRESHOLD = 3V VTH.A SHORTED TO GROUND, THRESHOLD = 2.5V
10
250
1
0 -45 -25
35 15 55 -5 TEMPERATURE (C)
75
95
1998 G05
0.1 35 45 55
65 75 85 95 105 115 125 TEMPERATURE (C)
1998 G06
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LTC1998 TYPICAL PERFORMANCE CHARACTERISTICS
Output Low Voltage vs Load Current
OUTPUT VOLTAGE RELATIVE TO VBATT (mV) 0.6 TA = 25C VLOGIC = VBATT = 3V OUTPUT VOLTAGE (V) TA = 85C 0.4 0 TA = 85C TA = 25C TA = -40C CURRENT (mA)
Output High Voltage vs Load Current
120 100 80 60 40 20 BATT = 3V BATT = 5V 5
1998 G08
Output Short-Circuit Current vs Supply Voltage
TA = 25C VBATT = VLOGIC
-50
-100
TA = -40C TA = 25C TA = 85C
SOURCE CURRENT, BATTLO SHORTED TO GND
TA = 25C 0.2 TA = -40C
-150
-200 TA = 25C VLOGIC = VBATT 1
0 1 2 3 4 OUTPUT SINK CURRENT (mA) 5
1998 G07
-250
SINK CURRENT, BATTLO SHORTED TO VLOGIC
2 3 4 OUTPUT SOURCE CURRENT (mA)
0 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)
1998 G09
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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 2): Ground should be connected to the battery (-) terminal through a trace that does not conduct load return current. 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. 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. VLOGIC (Pin 5): Positive Supply Voltage for Output Driver. This voltage can be driven from an external logic supply or tied to BATT. 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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LTC1998 QUICK DESIGN GUIDE
How to Calculate the External Resistor Values 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 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 is programmed via the voltage threshold adjust pin (VTH.A). A hysteresis adjust pin (VH.A) will add hysteresis to the programmed value of the low battery threshold voltage. Typical Application
Table 1: Design Equations for R1, R2, R3, Figure 1
Example 1: A system using a 4.2V (fully charged) LithiumIon battery requires a low battery threshold of 2.7V, 100mV hysteresis and can allow up to 4.2A maximum resistor current. RTOTAL = 1M, R1 = 786k, R2 = 66k and R3 = 148k Choose standard 1% values. R1 = 787k, R2 = 66.5k, R3 = 147k
1.5V TO 4.2V REGULATOR 0.1F 4 1 BATT 5 VH.A VLOGIC LTC1998 3 R3 1% 6 VTH.A BATTLO GND 2
1998 F01
VLOGIC
+
Li-Ion
R1 1% R2 1%
P
Choose desired values for: * VBATT.Th: Low Battery Threshold Voltage * VHYST: Hysteresis Voltage * IR: Max Allowable Resistor Current Solve: 4.2V RTOTAL = R1 + R2 + R3 = IR 5V R1 = RTOTAL * - 1 VBATT .Th + VHYST 5V R2 = RTOTAL * - 1 - R1 VBATT .Th R3 = RTOTAL - R1 - R2
Figure 1. Low Battery Threshold Detector with Hysteresis
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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 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: VBATT .Th = 2.5V + (VTH.A ) 2 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 4.1A when the battery voltage is 4.1V. Set the desired value of VBATT.Th (this value should 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). 5V Solve for R1= (R1+ R2) - 1 VBATT.Th 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 value for VBATT.Th as it will be slightly different from 2.85V, due to the use of standard 1% resistor values. VBATT .Th = 5V R1 + R2 = 2.849V R1 + (R1 + R2)
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. 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.
+
R1 Li-Ion 3 R2 1 BATT VTH.A LTC1998 2
1998 F02
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).
Figure 2. Resistor Divider Sets Threshold
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LTC1998 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 some battery load, thus inducing system confusion as the partially loaded battery recovers 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. The programming of the hysteresis threshold adjust pin (VH.A) is similar to the programming of the voltage threshold 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: VTH2 (V ) = 2.5V + H.A 2 It is imperative that the hysteresis threshold adjust voltage 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 threshold adjust pin. Combined Control of Threshold and Hysteresis If a resistor divider is desired, then both threshold adjust dividers can be combined in order to save current. This simple technique also guarantees that the hysteresis threshold adjust voltage at Pin 4 is higher than the voltage at the VTH.A pin, Figure 3.
R1 4 R2 3 R3
1998 F03
+
Li-Ion
VH.A
1 BATT
LTC1998 VTH.A
The actual hysteresis voltage is: VHYST = VTH2 - VBATT.Th
Figure 3. Combined Resistor Divider
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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 of R1 + R2 + R3 as well as the values for low battery threshold and hysteresis. Solve for resistor R1: 5V R1= (R1+ R2 + R3) - 1 VTH2 Solve for the sum of 5V (R1+ R2) = (R1+ R2 + R3) - 1 VBATT.Th then solve for R2 and R3. Example: A system needs to detect a low battery voltage of 3V (VBATT.Th = 3V) with 250mV hysteresis (VTH2 = 3.25V). Set the value of the resistor divider (R1 + R2 + R3) = 1M. 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. VERSATILE OUTPUT DRIVER VLOGIC, BATTLO (Pins 5,6) The LTC1998 uses a CMOS push-pull output stage to drive the low battery output signal. This output pin (BATTLO) 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 10k. The output will then act as an open-drain device. 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.
3.25V PROGRAMMED HYSTERESIS THRESHOLD PROGRAMMED LOW BATT THRESHOLD 2.50V
HYSTERESIS PROGRAMMABLE THRESHOLD RANGE
BATTERY VOLTAGE RECOVERS UNDER REDUCED LOAD
BATTERY VOLTAGE VLOGIC
BATTLO
1998 F04
Figure 4. LTC1998 Function Plot
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LTC1998 PACKAGE DESCRIPTION
S6 Package 6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
0.62 MAX 0.95 REF 2.90 BSC (NOTE 4)
1.22 REF
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 - 1.75 (NOTE 4) PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR
0.95 BSC
0.30 - 0.45 6 PLCS (NOTE 3)
0.80 - 0.90 0.20 BSC 1.00 MAX DATUM `A' 0.01 - 0.10
0.30 - 0.50 REF
NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193
0.09 - 0.20 (NOTE 3)
1.90 BSC
S6 TSOT-23 0302 REV B
1998fa
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
LTC1998 TYPICAL APPLICATIONS
Single Li-Ion Cell Low Battery Detector
VBATT = 1.5V TO 4.2V REGULATOR VLOGIC = 1V TO 5V 1 BATT 5 4 VH.A VLOGIC LTC1998 3 R3 1% 6 VTH.A BATTLO GND 2
1998 TA01
Backup Battery Switchover Circuit
2.5V TO 4.2V R1 787k 1% 4 R2 68.1k 1% 3 R3 147k 1% 1 BATT 5 VH.A VLOGIC LTC1998 VTH.A BATTLO GND 2 6 BAT54C BAT54C R4 1M MBRM120 VOUT Si2301
+
Li-Ion
R1 1% R2 1%
0.1F
+
Li-Ion P
Si2301
+
3V BACKUP BATTERY
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 R1 715k 1% 4 R2 9.09k 1% 3 R3 274k 1%
High Accuracy Window Comparator with Dual Hysteresis
VIN R1 619k 1% 4 R2 6.04k 1% 3 R3 383k 1% V+
1 BATT 5 VH.A VLOGIC LTC1998 VTH.A BATTLO GND 2 6 OUT
1 BATT 5 VH.A VLOGIC LTC1998 VTH.A BATTLO GND 2 6 2N7002
R7 1M VOUT VOUT = V+ WHEN 2.6V VIN 3.1V
LOW THRESHOLD = 2.9V HYSTERESIS = 15mV
1998 TA03
Low Battery Load Reduction Circuit
REGULATOR R1 787k 1% 4 R2 68.1k 1% 3 R3 147k 1%
R4 909k 1% 4 R5 6.98k 1% 3 R6 76.8k 1%
1 BATT 5 NC VH.A VLOGIC LTC1998 VTH.A BATTLO GND 2 6 WINDOW LOW THRESHOLD = 2.6V HYSTERESIS = 10mV WINDOW HIGH THRESHOLD = 3.1V HYSTERESIS = 10mV
1998 TA06
+
Li-Ion
1 BATT 5 VH.A VLOGIC LTC1998 6 VTH.A BATTLO GND 2
Si2301 CRITICAL CIRCUITRY
NONCRITICAL CIRCUITRY
LOW THRESHOLD = 2.7V HYSTERESIS = 100mV
1998 TA05
RELATED PARTS
PART NUMBER LTC1440/LTC1540 LTC1441/LTC1442 LTC1443/LTC1444/LTC1445 DESCRIPTION Micropower Comparator with 1% Reference Micropower Dual Comparator with 1% Reference Micropower Quad Comparator with 1% Reference COMMENTS 1.182V 1% Reference, 10mV (Max) Input Offset 1.182V 1% Reference (LTC1442) LTC1443 has 1.182V Reference, LTC1444/LTC1445 have 1.221V Reference and Adjustable Hysteresis
1998fa
12 Linear Technology Corporation
(408) 432-1900 FAX: (408) 434-0507
LT 0108 REV A * PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2001

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