LT1716
1
1716fa
TYPICAL APPLICATION
FEATURES DESCRIPTION
SOT-23, 44V, Over-the-Top,
Micropower, Precision
Rail-to-Rail Comparator
The LT
®
1716 comparator operates on any total power
supply voltage between 2.7V and 44V drawing 35μA of
quiescent current. The LT1716 has a unique input stage
that can be taken 44V above V–, independent of V+ supply.
(Built-in resistors protect the inputs for faults below the
negative supply of up to 5V.) The inputs can withstand
44V both differential and common mode.
The output stage includes a class “B” pull-up current
source, eliminating the need for an external resistive
pull-up and saving power. Output voltage swings to within
35mV of the negative supply and 55mV of the positive
supply, which makes the comparator a good choice for
low voltage single supply operation. The output stage is
also designed to drive loads connected to a higher supply
than the LT1716 supply, the same as an open collector
output stage.
The LT1716 is available in a SOT-23 5-lead package.
Lamp Monitor
APPLICATIONS
n Operates from 2.7V to 44V
n Over-The-Top
®
: Input Common Mode Range
Extends 44V Above V–, Independent of V+
n Micropower: 35μA IQ
n Offset Voltage: 1.5mV Max
n Valid Output with Either Input 5V Below V–
n Rail-to-Rail Output Swing
n Output Can Drive Loads Above V+
n Internal Pull-Up Current
n –40°C to 125°C Operating Temperature Range
n Low Profi le (1mm) SOT-23 (ThinSOT™) Package
n Power Supply Monitors
n Relay/Lamp Driver
n Oscillators
n Peak Detector
n Level Shifting L, LT, LTC, LTM, Over-The-Top, 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.
Input Bias Current vs Input Bias Voltage
3V
+
–
5V TO 44V
LAMP
ON/OFF 100k
RS
0.15Ω
1W
0.25A TO 2.5A
1716 TA01
LT1716 LAMP GOOD
CMPD6001
5k 4
3
1
5
2
1M 0.1μF
RS ≥ 0.04
IL
VIN– (V)
–10 –5 0 5 10 15 20 45
IB– (A)
1716 TA02
12μ
8μ
4μ
6n
3n
0
–3n
–6n
–100m
–0.5m
–1m
–1.5m
+IN = 2V +IN = 2V
+IN = 10V
INPUT
BELOW
SUPPLY
VS = 5V, 0V
INPUT
ABOVE
SUPPLY
LT1716
2
1716fa
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V+ to V–) .........................................44V
Differential Input Voltage ..........................................44V
Input Voltage .....................................................44V, –5V
Output Short-Circuit Duration (Note 2) ............ Indefi nite
Operating Temperature Range (Note 3)
LT1716C/LT1716I ................................ –40°C to 85°C
LT1716H ............................................ –40°C to 125°C
Specifi ed Temperature Range (Note 4)
LT1716C/LT1716I ................................ –40°C to 85°C
LT1716H ............................................ –40°C to 125°C
Maximum Junction Temperature .......................... 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)...................300°C
(Note 1)
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
1
2
3
OUT
V–
+IN
5
4
V+
–IN
+–
TJMAX = 150°C, θJA = 250°C/W
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT1716CS5#PBF LT1716CS5#TRPBF LTYD 5-Lead Plastic TSOT-23 –40°C to 85°C
LT1716IS5#PBF LT1716IS5#TRPBF LTYD 5-Lead Plastic TSOT-23 –40°C to 85°C
LT1716HS5#PBF LT1716HS5#TRPBF LTYD 5-Lead Plastic TSOT-23 –40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifi cations are at TA = 25°C. Single supply operation V+ = 5V, V– = 0V;
VCM = V+/2 unless otherwise noted. (Note 4)
SYMBOL PARAMETER CONDITIONS
LTC1716C/LT1716I
UNITSMIN TYP MAX
VOS Input Offset Voltage 0.5V < VCM < (VCC – 1V)
0°C < TA < 70°C
–40°C < TA < 85°C
l
l
300 1600
2100
2500
μV
μV
μV
Input Offset Voltage Drift (Note 5) 0°C < TA < 70°C
–40°C < TA < 85°C
l
l
2
2
μV/°C
μV/°C
IOS Input Offset Current VCM = V+/2
VCM = 0V
VCM = 44V
l
l
l
315
1.3
0.9
nA
μA
μA
IBInput Bias Current VCM = V+/2
l
20
35
50
75
nA
nA
V+ = 0V, VCM = 44V
VCM = 0V
VCM = 44V
VCM = –5V
l
l
l
2
3
6
1
13
9
1.4
nA
μA
μA
mA
Input Voltage Range (Note 7) l0.5 44 V
CMRR Common Mode Rejection Ratio 0.5V ≤ VCM < (V+ – 1V)
0.5V ≤ VCM < 44V (Note 6)
l
l
89
81
110
110
dB
dB
LT1716
3
1716fa
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifi cations are at TA = 25°C. Single supply operation V+ = 5V, V– = 0V;
VCM = V+/2 unless otherwise noted. (Note 4)
SYMBOL PARAMETER CONDITIONS
LTC1716C/LT1716I
UNITSMIN TYP MAX
PSRR Power Supply Rejection Ratio V– = 0V, VCM = 1.5V; 2.7V < V+ < 36V l95 110 dB
Minimum Operating Supply Voltage l2.4 2.7 V
AVOL Large-Signal Voltage Gain RL = 1k; 1V < VOUT < 4V
l
200
100
500 V/mV
V/mV
ISSupply Current V+ = 3V, RL = Open, VO = High
l
35 50
65
μA
μA
V+ = 5V, RL = Open, VO = High
l
35 55
75
μA
μA
V+ = 12V, RL = Open, VO = High
l
40 60
85
μA
μA
ISC–Output Sink Current (Note 2) VOVERDRIVE > 30mV l10 20 mA
ISC+Output Source Current VOVERDRIVE = 5mV, VOUT = 1V l60 85 μA
VOL Output Voltage Swing Low
(Referred to V–)
ISINK = 0mA, VOVERDRIVE = –10mV
ISINK = 0.1mA
ISINK = 1mA
ISINK = 5mA
l
l
l
l
20
75
200
550
35
110
300
900
mV
mV
mV
mV
VOH Output Voltage Swing High
(Referred to V+)
ISOURCE = 0μA, VOVERDRIVE = 10mV
ISOURCE = 10μA
l
l
30
130
55
185
mV
mV
Leakage Current VOUT = 40V, VOVERDRIVE > 100mV l0.5 2 μA
Propagation Delay VOVERDRIVE > 100mV, RLOAD = 10k 3 5.5 μs
The l denotes the specifi cations which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifi cations
are at TA = 25°C. Split supply operation VS = ±15V, VCM = 0V unless otherwise noted. (Note 4)
SYMBOL PARAMETER CONDITIONS
LT1716C/LT1716I
UNITSMIN TYP MAX
VOS Input Offset Voltage –14.5V < VCM < 14V
0°C < TA < 70°C
–40°C < TA < 85°C
l
l
300 1500
2000
2400
μV
μV
μV
Input Offset Voltage Drift (Note 5) 0°C < TA < 70°C
–40°C < TA < 85°C
l
l
2
2
μV/°C
μV/°C
IOS Input Offset Current VCM = 0V
VCM = 29V
VCM = –15V
l
l
l
315
0.9
1.3
nA
μA
μA
IBInput Bias Current VCM = 0V
l
30
50
60
100
nA
nA
VCM = 29V
VCM = –15V
VCM = –20V
l
l
l
6
3
1
9
13
1.4
μA
μA
mA
Input Voltage Range (Note 7) l–14.5 14 V
CMRR Common Mode Rejection Ratio –14.5V < VCM < 14V
–14.5V < VCM < 29V (Note 6)
l
l
92
81
110
98
dB
dB
PSRR Power Supply Rejection Ratio VS = ±1.35V to ±22V l90 110 dB
Minimum Operating Supply Voltage l2.4 2.7 V
AVOL Large-Signal Voltage Gain RL = 6k; –14V < VOUT < 14V
l
500
400
1000 V/mV
V/mV
ISSupply Current VS = ±15V, RL = Open, VO = High l40 95 μA
ISC–Output Sink Current (Note 2) VOVERDRIVE > 30mV l10 20 mA
ISC+Output Source Current VOVERDRIVE = 5mV, VOUT = –14V l70 105 μA
LT1716
4
1716fa
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifi cations are at TA = 25°C. Split supply operation VS = ±15V, VCM = 0V
unless otherwise noted. (Note 4)
SYMBOL PARAMETER CONDITIONS
LT1716C/LT1716I
UNITSMIN TYP MAX
VOL Output Voltage Swing Low
(Referred to V–)
ISINK = 0mA, VOVERDRIVE = –10mV
ISINK = 0.1mA
ISINK = 1mA
ISINK = 5mA
l
l
l
l
20
75
200
550
35
110
300
900
mV
mV
mV
mV
VOH Output Voltage Swing High
(Referred to V+)
ISOURCE = 0μA, VOVERDRIVE = 10mV
ISOURCE = 10μA
l
l
45
140
75
210
mV
mV
Leakage Current VOUT = 25V, VOVERDRIVE > 100mV l0.6 2 μA
Propagation Delay VOVERDRIVE > 100mV, RLOAD = 10k 5.5 9 μs
The l denotes the specifi cations which apply over the full operating temperature range of –40°C < TA < 125°C, otherwise specifi cations
are at TA = 25°C. Single supply operation V+ = 5V, V– = 0V; VCM = VCC/2 unless otherwise noted. (Note 4)
SYMBOL PARAMETER CONDITIONS
LT1716H
UNITSMIN TYP MAX
VOS Input Offset Voltage 0.5V < VCM < (VCC – 1V)
l
300 1600
2900
μV
μV
Input Offset Voltage Drift (Note 5) l2μV/°C
IOS Input Offset Current VCM = V+/2
VCM = 0V
VCM = 44V
l
l
l
3 220
1.3
0.9
nA
μA
μA
IBInput Bias Current VCM = V+/2
l
20 50
900
nA
nA
V+ = 0V, VCM = 44V
VCM = 0V
VCM = 44V
VCM = –5V
l
l
l
2
3
6
1
25
14
1.4
nA
μA
μA
mA
Input Voltage Range (Note 7) 0.5 44 V
CMRR Common Mode Rejection Ratio 0.5V < VCM < (V+ – 1V)
0.5V < VCM < 44V (Note 6)
l
l
75
72
110
110
dB
dB
PSRR Power Supply Rejection Ratio V– = 0V, VCM = 1.5V, 2.7V < V+ < 36V l85 110 dB
Minimum Operating Supply Voltage l2.4 2.7 V
AVOL Large-Signal Voltage Gain RL = 1k, 1V < VOUT < 4V
RL = 6k l
200
20
500 V/mV
V/mV
ISSupply Current per Amplifi er V+ = 3V, RL = Open, VO = High
l
35 50
70
μA
μA
V+ = 5V, RL = Open, VO = High
l
35 55
75
μA
μA
V+ = 12V, RL = Open, VO = High
l
40 60
85
μA
μA
ISC–Output Sink Current (Note 2) VOVERDRIVE > 30mV l510 mA
ISC+Output Source Current VOVERDRIVE = 5mV, VOUT = 1V l60 110 μA
VOL Output Voltage Swing Low
(Referred to V–)
ISINK = 0mA, VOVERDRIVE = –10mV
ISINK = 0.1mA
ISINK = 1mA
ISINK = 5mA
l
l
l
l
20
75
200
550
60
170
480
1200
mV
mV
mV
mV
VOH Output Voltage Swing High
(Referred to V+)
ISOURCE = 0μA, VOVERDRIVE = –10mV
ISOURCE = 10μA
l
l
50
130
110
220
mV
mV
Leakage Current VOUT = 40V, VOVERDRIVE > 100mV l1.7 5 μA
Propagation Delay VOVERDRIVE > 100mV, RLOAD = 10k 6 9 μs
LT1716
5
1716fa
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range of –40°C < TA < 125°C, otherwise specifi cations are at TA = 25°C. Split supply operation VS = ±15V, VCM = 0V
unless otherwise noted. (Note 4)
SYMBOL PARAMETER CONDITIONS
LT1716H
UNITSMIN TYP MAX
VOS Input Offset Voltage –14.5V < VCM < 14V
l
300 1500
2900
μV
μV
Input Offset Voltage Drift (Note 5) l2 μV/°C
IOS Input Offset Current VCM = 0V
VCM = 29V
VCM = –15V
l
l
l
3 280
0.9
1.3
nA
μA
μA
IBInput Bias Current VCM = 0V
l
30
50
60
1400
nA
nA
VCM = 29V
VCM = –15V
VCM = –20V
l
l
l
6
3
1
20
30
1.4
μA
μA
mA
Input Voltage Range (Note 7) l–14.5 14 V
CMRR Common Mode Rejection Ratio –14.5V < VCM < 14V
–14.5V < VCM < 29V (Note 6)
l
l
85
70
110
93
dB
dB
PSRR Power Supply Rejection Ratio VS = ±1.35V to ±22V l80 110 dB
Minimum Operating Supply Voltage l2.4 2.7 V
AVOL Large-Signal Voltage Gain RL = 6k; –14V < VOUT < 14V
RL = 6k; –13V < VOUT < 13V l
500
50
1000 V/mV
V/mV
ISSupply Current VS = ±15V, RL = Open, VO = High 40 95 μA
ISC–Output Sink Current (Note 2) VOVERDRIVE > 30mV l510 mA
ISC+Output Source Current VOVERDRIVE = 5mV, VOUT = –14V l70 155 μA
VOL Output Voltage Swing Low
(Referred to V–)
ISINK = 0mA, VOVERDRIVE = –10mV
ISINK = 0.1mA
ISINK = 1mA
ISINK = 5mA
l
l
l
l
20
75
200
550
70
170
480
1200
mV
mV
mV
mV
VOH Output Voltage Swing High
(Referred to V+)
ISOURCE = 0μA, VOVERDRIVE = 10mV
ISOURCE = 10μA
l
l
45
140
120
250
mV
mV
Leakage Current VOUT = 25V, VOVERDRIVE > 100mV l1.5 5 μA
Propagation Delay VOVERDRIVE > 100mV, RLOAD = 10k 5.5 10 μs
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: A heat sink may be required to keep the junction temperature
below absolute maximum.
Note 3: The LT1716C/LT1716I are guaranteed functional over the operating
temperature range of –40°C to 85°C. The LT1716H is guaranteed
functional over the operating temperature range of –40°C to 125°C.
Note 4: The LT1716C is guaranteed to meet specifi ed performance from
0°C to 70°C. The LT1716C is designed, characterized and expected to meet
performance from –40°C to 85° but is not tested or QA sampled at the
temperatures. The LT1716I is guaranteed to meet specifi ed performance
from –40°C to 85°C. The LT1716H is guaranteed to meet specifi ed
performance from –40°C to 125°C.
Note 5: This parameter is not 100% tested.
Note 6: Typical input offset voltage of 500μV at VCM = 44V above V– and a
maximum input offset voltage of 4mV at VCM = 44V above V–.
Note 7: If one input is within this input range, the other input can go 5V
below V– and the output will be valid.
LT1716
6
1716fa
TYPICAL PERFORMANCE CHARACTERISTICS
Output Low Voltage
vs Sink Current
Output High Voltage
vs Source Current
Input Bias Current with Inputs
Driven Above the Supply
Input Bias Current with Inputs
Driven Below the Supply Supply Current vs Temperature
Positive Supply Current
vs Output Sinking Current
Input Bias Current
vs Common Mode Voltage
Input Bias Current
vs Temperature
Input Bias Current
vs Differential Input Voltage
VCM (V)
0
IBIAS (μA)
10
8
6
4
2
0
–2
1716 G01
5 10 15 20 25 30
VS = ±15V
125°C
INPUTS
EXCEED SUPPLY
125°C
25°C 85°C
–55°C
TEMPERATURE (°C)
–50
–0.0100
–0.0010
0.0000
0.0010
0.0100
0.1000
1.0000
INPUT BIAS CURRENT (μA)
050
100 150
1716 G02
–25 25 75 125
CURRENT
OUT OF PIN
CURRENT
OUT OF PIN
V+ = 15V
V– = –15V
VCM = 0V V+ = 5V
V– = 0V
VCM = 2.5V
DIFFERENTIAL INPUT VOLTAGE (V)
–0.2
IBIAS CURRENT (nA)
–1
0
1
–0.05 0.05 0.2
1716 G03
–2
–3
–4
–0.15 –0.1 00.1 0.15
V+ = 15V
V– = –15V
–IN +IN
TRANSITION
REGION
LOADING SINK CURRENT (mA)
0
OUTPUT VOLTAGE (RELATIVE TO GND) (V)
2.0
1.6
1.2
0.8
0.4
0
1716 G04
2 4 6 8 10 12 14 16 18 20
V+ = 5V
V– = 0V
VOL AT 85°C
VOL AT 125°C
VOL AT –55°C
VOL AT 25°C
VCM (V)
0
IBIAS (μA)
10
8
6
4
2
0
–2
1716 G06
51015 20 25 30 35 40 45 50
125°C
85°C
–55°C
25°C
INPUTS
EXCEED SUPPLY
V+ = 5V
V– = 0V
VCM (V)
–5
IBIAS (μA)
200
0
–200
–400
–600
–800
–1000
–1200
1716 G07
–4 –3 –2 –1 0
V+ = 2.7V TO 44V
V– = 0V
–55°C < TA < 125°C
TEMPERATURE (°C)
–50
0
SUPPLY CURRENT (μA)
10
30
40
50
100
70
050 75
1716 G08
20
80
90
60
–25 25 100 125 150
V+ = 5V
V– = 0V
OUTPUT LOW
OUTPUT HIGH
OUTPUT SINK CURRENT (mA)
0.1
10
POSITIVE SUPPLY CURRENT (μA)
100
1000
1 10 100
1716 G09
VS = ±15V
TA = 25°C
VS = 5V
LOADING SOURCE CURRENT (μA)
0
OUTPUT HIGH VOLTAGE (RELATIVE TO V+) (V)
5.0
4.9
4.8
4.7
4.6
4.5
1716 G05
5 10 15 20 25 30 35 40 45 50
V+ = 5V
V– = 0V
VOH AT 85°C, 125°C
VOH AT –55°C
VOH AT 25°C
LT1716
7
1716fa
TYPICAL PERFORMANCE CHARACTERISTICS
Output Sinking Current
vs Total Supply Voltage
Total Switching Time
vs Temperature
Total Switching Time
vs Overdrive
Total Switching Time
vs Total Supply Voltage
Total Switching Time
vs Pull-Up Resistor Response Time
Output Leakage Current
vs Output Voltage Reverse Supply Current
Output Sinking Current Limit
vs Temperature
OUTPUT VOLTAGE (V)
5
OUTPUT LEAKAGE CURRENT (nA)
500
450
400
350
300
250
1716 G10
10 15 20 25 30 35 40 45
V+ = 5V
V– = 0V
TA = 25°C
REVERSE VOLTAGE (V)
0
REVERSE CURRENT (mA)
0.6
0.5
0.4
0.3
0.2
0.1
0
1716 G27
5 10 15 20 25
TA = 25°C
TEMPERATURE (°C)
–50
0
OUTPUT CURRENT LIMIT (mA)
5
10
15
20
050
100 150
1716 G11
25
30
–25 25 75 125
OUTPUT SHORTED TO V+
VS = 5V
VS = ±15V
TOTAL SUPPLY VOLTAGE (V)
1
0
OUTPUT SINKING LIMIT (mA)
5
10
15
20
30
10 100
1716 G12
25
OUTPUT SHORTED TO V+
TA = 25°C
TEMPERATURE (°C)
0
1
10
100
50 100
25 75 125
1716 G13
TOTAL SWITCHING TIME (μs)
–50 –25 150
RL = 10k
VOUT = 90% VFINAL (RISE)
VOUT = 10% VFINAL (FALL)
VSTEP = 100mV
VOVERDRIVE = 10mV
VS = ±15V
FALL
VS = ±15V
RISE
VS = ±2.5V
RISE
VS = ±2.5V
FALL
OVERDRIVE (mV)
10
TOTAL SWITCHING TIME (μs)
30
100
1716 G14
1
10
20 100
90
807060
50
40
0
RL = 10k
VOUT = 90% VFINAL (RISE)
VOUT = 10% VFINAL (FALL)
VSTEP = 100mV
TA = 25°C
±15V
RISE TIME
±15V
FALL TIME
±2.5V
FALL TIME
±2.5V
RISE TIME
TOTAL SUPPLY VOLTAGE (V)
10
1
10
100
20 30
1716 G15
TOTAL SWITCHING TIME (μs)
040
RL = 10k
VOUT = 90% VFINAL (RISE)
VOUT = 10% VFINAL (FALL)
VCM = 1/2 VTOTALSUPPLY
VSTEP = 100mV
VOVERDRIVE = 10mV
FALL
RISE
PULL-UP RESISTOR (k)
1 10
1
TOTAL SWITCHING TIME (μs)
10
100
100 1000 10000
1716 G16
VOUT = 90% VFINAL
VSTEP = 100mV
VOVERDRIVE = 10mV
TA = 25°C
VS = ±2.5V
RISE
VS = ±15V
RISE
30V
26V
5V
0V
TIME (μs)VS = 5V, 0V
VOD = 10mV
RL = 10k, 100k, OPEN
VIN+ = 26V TO 30V
VIN– = 29.99V
1716 G17
VIN+
VOUT RL = 10k
RL = 100k
RL = OPEN
LT1716
8
1716fa
TYPICAL PERFORMANCE CHARACTERISTICS
Response Time Response Time Response Time
30V
26V
5V
0V
TIME (μs)VS = 5V, 0V
VOD = 10mV
RL = 10k, 100k, OPEN
VIN+ = 30V TO 26V
VIN– = 26.01V
1716 G18
VIN+
VOUT
25V
21V
15V
–15V
TIME (μs)VS = ±15V
VOD = 10mV
RL = 10k, 100k, OPEN
VIN+ = 21V TO 25V
VIN– = 24.99V
1716 G19
VIN+
VOUT RL = 10k, 100k
RL = OPEN
25V
21V
15V
–15V
TIME (μs)VS = ±15V
VOD = 10mV
RL = 10k, 100k, OPEN
VIN+ = 25V TO 21V
VIN– = 21.01V
1716 G20
VIN+
VOUT
Response Time Response Time Response Time
2.5V VOUT
5V
2.4V
0V
TIME (μs)VS = ±15V
VOD = 10mV
RL = 10k, 100k, OPEN
VIN+ = 2.4V TO 2.5V
VIN– = 2.49V
1716 G21
VIN+
RL = 10k RL = 100k
RL = OPEN
2.6V
2.5V
5V
0V
TIME (μs)VS = 5V
VOD = 10mV
RL = 10k, 100k, OPEN
VIN+ = 2.6V TO 2.5V
VIN– = 2.51V
1716 G22
VIN+
VOUT
0V
–100mV
15V
–15V
TIME (μs)VS = ±15V
VOD = 10mV
RL = 10k, 100k, OPEN
VIN+ = –100mV TO 0V
VIN– = –10mV
1716 G23
VIN+
VOUT
RL = 10k, 100k
RL = OPEN
Response Time Below VS– Fault (Rising) Below VS– Fault (Falling)
100mV
0V
15V
–15V
TIME (μs)VS = ±15V
VOD = 10mV
RL = 10k, 100k, OPEN
VIN+ = 110mV TO 0mV
VIN– = 10mV
1716 G24
VIN+
VOUT
–14.9V
–19V
15V
–15V
TIME (μs)VS = ±15V
RL = 10k, 100k, OPEN
VIN+ = –19V TO –14.9V
VIN– = –15V
1716 G25
VIN+
VOUT
RL = 10k, 100k
RL = OPEN
–14.9V
–19V
15V
–15V
TIME (μs)VS = ±15V
RL = 10k, 100k, OPEN
VIN+ = –14.9V TO –19V
VIN– = –15V
1716 G26
VIN+
VOUT
LT1716
9
1716fa
APPLICATIONS INFORMATION
The LT1716 comparator features low power operation
with exceptional input precision with rail-to-rail input and
output swing. The comparator operates fl awlessly even
when the inputs are pulled over the positive rail or below
the negative rail.
Supply Voltage
The LT1716 operates from 2.7V to 44V. The comparator
can be shut down by removing V+. In this condition, the
input bias current is typically less than 3nA, even if the
inputs are 44V above the negative supply. The LT1716 is
protected against reverse battery voltages of up to 20V.
The reverse battery current is resistive as shown in the
Reverse Supply Current graph.
Inputs
The comparator inputs can swing from 0.5V above to 44V
above V–. If one input is within this range, the other input
can be forced up to 5V below V– without phase reversal
occuring at the output.
The LT1716 has three stages—NPN, PNP and common
base (see Simplifi ed Schematic)—resulting in three
distinct operating regions and two transition regions as
shown in the Input Bias Current vs Common Mode typical
performance curve.
For input voltages about 0.8V or more below V+, the PNP
input stage is active and the input bias current is typically
–4nA. The PNP differential input stage will have bias cur-
rent that fl ows out of the device. With a differential input
voltage of even just 100mV or so, there will be zero bias
current into the higher of the two inputs, while the current
fl owing out of the lower input will be twice the measured
bias current.
When the input voltage is about 0.5V or less from V+, the
NPN state is operating and the input bias current is typically
10nA. Increases in temperature will cause the voltage at
which operation switches from the PNP stage to the NPN
stage to move towards V+. The input offset voltage of the
NPN stage is untrimmed and is typically 500μV.
A Schottky diode in the collector of each NPN transistor
of the NPN input stage allows the LT1716 to operate with
either or both of its inputs above V+. At about 0.3V above
V+, the NPN transistor is fully saturated and the input bias
current is typically 4μA at room temperature. The input
offset voltage is typically 500μV when operating above
V+. The LT1716 will operate with its input 44V above V–,
regardless of V+.
The transition to the negative common mode input stage
occurs at 0.3V above V–. Above this trip point the PNP
stage is active. When the inputs are 0.3V below V–, the
common base input stage is active in addition to the PNP
stage. The input bias current out of each input becomes
VIN/5kΩ. The LT1716 is designed to operate when either
input falls below the negative supply. Internal resistors
protect the inputs for faults below the negative supply of
up to 5V without phase reversal. The built-in 5k resistor
limits the current at each input to 1mA at 5V below the
negative supply. External matched input resistors can
be added for increased voltage fault operation below the
negative supply but the maximum input current should
be kept under 1mA.
Input Protection
The inverting and noninverting input pins of the LT1716
have on-chip protection. ESD protection is provided to
prevent damage during handling. The input transistors
have voltage clamping and limiting resistors to protect
against excursions as much as 5V below V–. There are
no clamping diodes between the inputs and the maximum
differential input voltage is 44V.
Output
The output stage of the LT1716 can drive loads connected
to a supply more positive than the device, the same as
comparators with open collector output stages. The
output of the LT1716 can be pulled up to 44V above V–,
regardless of V+.
LT1716
10
1716fa
SIMPLIFIED SCHEMATIC
Q18
Q34
Q17Q16Q15
Q61
Q6
B
A
Q5
R1
5k
IN–
VCC
VEE
B
A
Q8 Q9
Q10
Q62
Q33
Q39
D5
Q35
Q3 Q4 Q1
Q53
Q7
Q2
R2
5k
IN+
D4D3
Q21
3μA
Q20
Q11
R3
60k
R4
30k R5 R8 R6
R9 R10 R11
R7
Q12 Q13 Q14
Q25 Q24
Q31 Q32
Q22 Q23
Q36
Q37
Q38
Q30
1716 SS
Q26 Q27 D7
Q28D8 Q29
OUT
D6D2D1
LT1716
11
1716fa
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.
PACKAGE DESCRIPTION
S5 Package
5-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1635)
1.50 – 1.75
(NOTE 4)
2.80 BSC
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
DATUM ‘A’
0.09 – 0.20
(NOTE 3) S5 TSOT-23 0302
PIN ONE
2.90 BSC
(NOTE 4)
0.95 BSC
1.90 BSC
0.80 – 0.90
1.00 MAX
0.01 – 0.10
0.20 BSC
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
3.85 MAX
0.62
MAX
0.95
REF
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
1.4 MIN
2.62 REF
1.22 REF
LT1716
12
1716fa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2002
LT 0809 REV A • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATIONS
Overcurrent Flag
3V
+
–
4.5V TO 44V LT1634-1.25
113k
1%
10M
1%
RS
1716 TA03
LT1716 OVERCURRENT
CMPD6263
11.8k
1%
10.7k
1%
4
3
1
5
2
IMAX = 0.1
RS
0.1μF
LOAD 10M
1%
Charge/Discharge Indicator
3V
+
–
0.1Ω
CHARGE
CURRENT
681Ω
1%
1M
1%
3V TO 44V
1716 TA04
LT1716 CHARGE
CMPD6263
681Ω
1% 1M
1%
4
3
1
5
2
0.1μF
LOAD VCHARGER
+
–
PART NUMBER DESCRIPTION COMMENTS
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LTC1540 Nanopower Comparator and 1% Reference 1.182V ±1% Reference, ±10mVMAX Input Offset
LT1634 Micropower Precision Shunt Reference 0.05%, 10μA, 10ppm/°C Max Drift, 1.25V, 2.5V, 4.096V, 5V,
MSOP, SO-8, TO-92 Packages
LTC1921 Dual –48V Telecom Supply Monitor Monitors Two Supplies and Fuses
LTC1998 Micropower Li-Ion Battery Monitor 1% Trip Point Adjustable from 2.5V to 3.25V
