LINEAR TECHNOLOGY LTC1440, LTC1441, LTC1442 Technical data

FEATURES

LTC1440/LTC1441/LTC1442

Ultralow Power Single/Dual

Comparator with Reference

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DESCRIPTIO

■

Ultralow Quiescent Current: 2.1µA Typ (LTC1440)

■

Reference Output Drives 0.01µF Capacitor

■

Adjustable Hysteresis (LTC1440/LTC1442)

■

Wide Supply Range:

Single: 2V to 11V
Dual: ± 1V to ± 5.5V

■

Input Voltage Range Includes the Negative Supply

■

TTL/CMOS Compatible Outputs

■

12µs Propagation Delay with 10mV Overdrive

■

No Crowbar Current

■

40mA Continuous Source Current

■

Pin Compatible Upgrades for MAX921/922/923

■

3mm x 3mm x 0.8mm DFN Package (LTC1440)

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APPLICATIONS

■

Battery-Powered System Monitoring

■

Threshold Detectors

■

Window Comparators

■

Oscillator Circuits

, LTC and LT are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

The LTC®1440/LTC1441/LTC1442 are ultralow power
single and dual comparators with built-in references. The
comparators feature less than 3.7µA supply current over
temperature (LTC1440), a 1.182V ±1% reference, pro­grammable hysteresis (LTC1440/LTC1442) and TTL/CMOS
outputs that sink and source current. The reference output
can drive a bypass capacitor of up to 0.01µF without
oscillation.

The comparators operate from a single 2V to 11V supply
or a dual ± 1V to ±5.5V supply (LTC1440). Comparator
hysteresis is easily programmed by using two resistors
and the HYST pin (LTC1440/LTC1442). Each comparator’s
input operates from the negative supply to within 1.3V of
the positive supply. The comparator output stage can
continuously source up to 40mA. By eliminating the
cross-conducting current that normally happens when the
comparator changes logic states, the power supply glitches
are eliminated.

The LTC1440 is available in 8-pin PDIP, SO, MSOP and
DFN packages. The LTC1441/LTC1442 are available in
8-pin PDIP and SO packages.

TYPICAL APPLICATIO

Micropower 2.9V VCC Threshold Detector

3.3V

R1

1.65M
1%

R2

1.13M
1%

+

IN

3

–

4

IN

5

HYST

6

REF

7

+

V

+

–

LTC1440

–

V

21

GND

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1440 TA01

LTC1440 Supply Current vs Temperature

5.0
V+ = 5V

–

= GND = 0V

V

4.5

4.0

8

OUT

3.5

3.0

2.5

SUPPLY CURRENT (µA)

2.0

1.5

–40

–20 0

40 80

20 60

TEMPERATURE (°C)

100

1440/1/2 TA02

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1

LTC1440/LTC1441/LTC1442

WW

W

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ABSOLUTE MAXIMUM RATINGS

(Note 1)

Voltage

+

V

to V–, V+ to GND, GND to V–...........12V to – 0.3V

+

, IN–, HYST ................. (V+ + 0.3V) to (V–– 0.3V)

IN

REF ................................... (V

OUT (LTC1440) .............. (V

+

+ 0.3V) to (V–– 0.3V)

+

+ 0.3V) to (GND – 0.3V)

OUT (LTC1441/LTC1442) ... (V+ + 0.3V) to (V–– 0.3V)

Current

+

IN

, IN–, HYST ................................................. 20mA

REF ................................................................... 20mA

OUT .................................................................. 50mA

OUT Short-Circuit Duration (V+ ≤ 5.5V) .......Continuous

Power Dissipation.............................................. 500mW

Operating Temperature Range

LTC144XC ............................................... 0°C to 70°C

LTC144XI ........................................... – 40°C to 85°C

Storage Temperature Range ................. –65°C to 150°C

Storage Temperature Range

(DD Package) ................................... – 65°C to 125°C

Junction Temperature........................................... 150°C

Junction Temperature (DD Package) .................... 125°C

Lead Temperature (Soldering, 10 sec).................. 300°C

U

W

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PACKAGE/ORDER INFORMATION

TOP VIEW

TOP VIEW

1NULL

–IN A

2

+IN A

3

–

V

4

8-LEAD (3mm × 3mm) PLASTIC DFN

UNDERSIDE METAL CONNECTED TO V

DD PACKAGE

T

= 125°C, θJA = 160°C/ W (DD)

JMAX

(PCB CONNECTION OPTIONAL)

ORDER PART

NUMBER

LTC1440CDD
LTC1440IDD

TOP VIEW

OUT A

1

–

V

2

+

IN A

3

–

IN A

4

N8 PACKAGE
8-LEAD PDIP

T

= 150°C, θJA = 130°C/ W (N8)

JMAX

= 150°C, θJA = 175°C/ W (S8)

T

JMAX

Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/

8

NULL

+

V

7

OUT

6

SHDN

5

DD8 PART

MARKING*

LBTH

OUT B

8

+

V

7

IN B

6

IN B

5

S8 PACKAGE

8-LEAD PLASTIC SO

GND

1

–

V

2

+

IN

3

–

IN

4

N8 PACKAGE
8-LEAD PDIP

T

–

T

JMAX
JMAX

8-LEAD PLASTIC SO

= 150°C, θJA = 130°C/ W (N8)
= 150°C, θJA = 175°C/ W (S8)

ORDER PART

NUMBER

LTC1440CN8
LTC1440CS8

OUT

8

V

7

REF

6

HYST

5

S8 PACKAGE

S8 PART

MARKING

1440
1440I

+

GND

V
IN
IN

T

ORDER PART

NUMBER

LTC1440CMS8

LTC1440IMS8
LTC1440IN8
LTC1440IS8

ORDER PART

NUMBER

LTC1441CN8
LTC1441CS8

+

–

LTC1441IN8
LTC1441IS8

S8 PART

MARKING

OUT A

V

IN A

IN B

N8 PACKAGE
8-LEAD PDIP

1441

TOP VIEW

1

–

2

+

3

–

4

S8 PACKAGE

8-LEAD PLASTIC SO

T

= 150°C, θJA = 130°C/ W (N8)

JMAX

T

= 150°C, θJA = 175°C/ W (S8)

JMAX

OUT B

8

+

V

7

REF

6

HYST

5

1441I

TOP VIEW

1

–

2

+

3

–

4

MS8 PACKAGE

8-LEAD PLASTIC MSOP

= 150°C, θJA = 250°C/ W

JMAX

ORDER PART

LTC1442CN8
LTC1442CS8
LTC1442IN8
LTC1442IS8

OUT

8

+

7

V

6

REF

5

HYST

MS8 PART

MARKING*

LTBX

NUMBER

S8 PART

MARKING

1442
1442I

Consult LTC Marketing for parts specified with wider operating temperature ranges.
* The temperature grade is identified by a label on the shipping container.

2

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LTC1440/LTC1441/LTC1442

ELECTRICAL CHARACTERISTICS

temperature range, otherwise specifications are at T

The ● denotes the specifications which apply over the full operating

= 25°C. V+ = 5V and V– = GND = 0V unless otherwise noted.

A

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply

+

V
I

CC

Supply Voltage Range
Supply Current IN+ = IN– + 80mV LTC1440 CTemp Range

HYST = REF (LTC1440/LTC1442) I Temp Range

LTC1441
LTC1442

●

●

●

●

●

2.0 11.0 V

2.1 4.0 µA

4.4 µA

3.5 5.7 µA

3.5 5.7 µA

Comparator

V

OS

I

IN

V

CM

Comparator Input Offset Voltage VCM = 2.5V
Input Leakage Current (IN+, IN–)V

+

= V

IN

IN

Input Leakage Current (HYST)
Comparator Input Common

–

= 2.5V

●

●

●

●

V

±3 ±10 mV

±0.01 ±1.0 nA
±0.02 ±1.0 nA

–

V+ – 1.3V V

Mode Range

CMRR Common Mode Rejection Ratio V– to V+ – 1.3V 0.1 1 mV/V

+

PSRR Power Supply Rejection Ratio V

= 2V to 11V (LTC1441) 0.1 1 mV/V

V+ = 2.5V to 11V (LTC1440/LTC1442) 0.1 1 mV/V
NOISE Voltage Noise 100Hz to 100kHz 100 µV
V
t

PD

HYST

Hysteresis Input Voltage Range LTC1440/LTC1442
Propagation Delay C

= 100pF Overdrive = 10mV 15 µs

OUT

●

REF – 50mV REF V

RMS

Overdrive = 100mV 8 µs

V

OH

V

OL

Output High Voltage IO = – 13mA
Output Low Voltage IO = 1.8mA LTC1440

LTC1441/LTC1442

●

V+ – 0.4V V

●

●

GND + 0.4V V

V– + 0.4V V

Reference

V

REF

I

SOURCE

I

SINK

∆V

NOISE Voltage Noise 100Hz to 100kHz 100 µV

Reference Voltage No Load C Temp Range

LTC1440/LTC1442 I Temp Range

LTC1440 (MSOP, DFN)

Reference Output Source Current ∆V
Reference Output Sink Current ∆V
Reference Source Current 0 ≤ I

REF

Reference Sink Current 0 ≤ I

≤ 1mV (LTC1442)

REF

≤ 2.5mV (LTC1442) 10 20 µA

REF

≤ 2mA (LTC1440)

SOURCE

≤ 10µA (LTC1440) 0.5 1.5 mV

SINK

●

1.170 1.182 1.194 V

●

1.164 1.200 V

●

1.164 1.200 V

●

100 200 µA

●

●

0.8 5 mV

5mV

RMS

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3

LTC1440/LTC1441/LTC1442

ELECTRICAL CHARACTERISTICS

temperature range, otherwise specifications are at T

The ● denotes the specifications which apply over the full operating

= 25°C. V+ = 3V and V– = GND = 0V unless otherwise noted.

A

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply

+

V

I

CC

Supply Voltage Range

Supply Current IN+ = IN– + 80mV LTC1440 CTemp Range

HYST = REF (LTC1440/LTC1442) I Temp Range

LTC1441
LTC1442

●

●

●

●

●

211V

2 3.9 µA

4.3 µA

3.5 5.7 µA

3.5 5.7 µA

Comparator

V

OS

I

IN

V

CM

Comparator Input Offset Voltage VCM = 1.5V
Input Leakage Current (IN+, IN–)V

+

= V

IN

IN

Input Leakage Current (HYST)
Comparator Input Common

–

= 1.5V

●

●

●

●

V

±3 ± 10 mV

±0.01 ±1nA
±0.02 ±1nA

–

V+ – 1.3V V

Mode Range

CMRR Common Mode Rejection Ratio V– to V+ – 1.3V 0.1 1 mV/V

+

PSRR Power Supply Rejection Ratio V

= 2V to 11V (LTC1441) 0.1 1 mV/V

V+ = 2.5V to 11V (LTC1440/LTC1442) 0.1 1 mV/V
NOISE Voltage Noise 100Hz to 100kHz 100 µV
V
t

PD

HYST

Hysteresis Input Voltage Range LTC1440/LTC1442
Propagation Delay C

= 100pF Overdrive = 10mV 14 µs

OUT

●

REF – 50mV REF V

RMS

Overdrive = 100mV 5 µs

V

OH

Output High Voltage IO = – 8mA

●

V+ – 0.4V V

Comparator

V

OL

Output Low Voltage IO = 0.8mA LTC1440

LTC1441/LTC1442

●

●

GND + 0.4V V

V– + 0.4V V

Reference

V

REF

I

SOURCE

I

SINK

∆V

NOISE Voltage Noise 100Hz to 100kHz 100 µV

Reference Voltage No Load C Temp Range

LTC1440/LTC1442 I Temp Range

LTC1440 (MSOP, DFN)

Reference Output Source Current ∆V
Reference Output Sink Current ∆V
Reference Source Current 0 ≤ I

REF

Reference Sink Current 0 ≤ I

≤ 1mV (LTC1442)

REF

≤ 2.5mV (LTC1442) 10 20 µA

REF

≤ 1mA (LTC1440)

SOURCE

≤ 10µA (LTC1440) 0.5 1.5 mV

SINK

●

1.170 1.182 1.194 V

●

1.164 1.200 V

●

1.164 1.200 V

●

●

●

60 120 µA

0.8 5.5 mV

5mV

RMS

Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.

4

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LTC1440/LTC1441/LTC1442

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Comparator Response Time vs
Input Overdrive

5

TA = 25°C

4

3

2

1

0

0

100

INPUT VOLTAGE (mV) OUTPUT VOLTAGE (V)

–1

100mV 10mV

50mV 20mV

20108

RESPONSE TIME (µs)

Comparator Short-Circuit Sink
Current vs Supply Voltage

200

TA = 25°C

180

160

140

120

100

80

60

SINK CURRENT (mA)

40

20

0

OUT CONNECTED TO V

213579

0

4

SUPPLY VOLTAGE (V)

Comparator Response Time vs
Input Overdrive

5

TA = 25°C

4

3

2

1

0

100

0

64

1440/1/2 G01

INPUT VOLTAGE (mV) OUTPUT VOLTAGE (V)

100mV

–1

08

50mV

20mV

10mV

16

12

210

4

6

RESPONSE TIME (µs)

14

1440/1/2 G02

18

Comparator Short-Circuit Source
Current vs Supply Voltage

160

140

+

6

8

10

1440/1/2 G03

120

100

80

60

SOURCE CURRENT (mA)

40

20

0

0

OUT CONNECTED TO

12 4

SUPPLY VOLTAGE (V)

–

= GND = 0V

V

3

5

1440/1/2 G04

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5