Linear Technology LTC1445IN, LTC1445CS, LTC1445CN, LTC1444IS, LTC1444CN Datasheet

FEATURES

■

Ultralow Quiescent Current: 8.5µA Max

■

Wide Supply Range

Single: 2V to 11V
Dual: ±1V to ±5.5V

■

Input Voltage Range Includes the Negative Supply

■

Reference Output Drives 0.01µF Capacitor

■

Adjustable Hysteresis (LTC1444/LTC1445)

■

TTL/CMOS Compatible Outputs

■

Propagation Delay: 12µs (Typ) (10mV Overdrive)

■

No Crowbar Current

■

40mA Continuous Source Current

■

Pin Compatible Upgrades for MAX924 (LTC1443)

U

APPLICATIO S

■

Battery-Powered System Monitoring

■

Threshold Detectors

■

Window Comparators

■

Oscillator Circuits

LTC1443/LTC1444/LTC1445

Ultralow Power Quad

Comparators with Reference

U

DESCRIPTIO

The LTC®1443/LTC1444/LTC1445 are ultralow power quad
comparators with a built-in reference. The comparators
feature less than 8.5µA supply current over temperature,
an internal reference (1.182V ±1% for LTC1443 or 1.221V
±1% for LTC1444/LTC1445), programmable hysteresis
(LTC1444/LTC1445) and TTL/CMOS output (LTC1443/
LTC1445) that sinks and sources current (open-drain
output for LTC1444). 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 (LTC1443). Comparator
hysteresis is easily programmable using two resistors and
the HYST pin (LTC1444/LTC1445). Each comparator’s
input operates from the negative supply to within 1.3V of
the positive supply. The LTC1443/LTC1445 comparator
output stage can continuously source up to 40mA. By
eliminating the cross-conducting current that normally
happens when the comparator changes logic states, power
supply glitches are eliminated.

TYPICAL APPLICATIO

Reference Settling Test Circuit

V

IN

3.4M
1%

1.21M
1%

5V
TO 8V

R2

2.4M

R1

10k

5

4

14

8

R3
430Ω

C1

1.0µF

IN A

IN A

HYST

REF

U

+

–

+

–

3

+

V

LTC1445

–

V

9

LTC1443/44/45 • TA01

The LTC1443/LTC1444/LTC1445 are available in the
16-pin SO and PDIP packages.

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

Reference Settling

8V

+

V

5V

2

OUT

V

REF

2mV/DIV

OUT

2ms/DIV

LTC1443/1444/1445 • TA02

1

LTC1443/LTC1444/LTC1445

WWWU

ABSOLUTE AXI U RATI GS

(Note 1)

Voltage:

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

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

REF.................................. (V+ + 0.3V) to (V– – 0.3V)

OUT (LTC1443) ............. (V+ + 0.3V) to (GND – 0.3V)
OUT (LTC1444/LTC1445)

......................................... (V+ + 0.3V) to (V– – 0.3V)

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

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

UU

W

PACKAGE/ORDER I FOR ATIO

1

OUT B

2

OUT A

+

3

V

–

4

IN A

+

5

IN A

–

6

IN B

+

7

IN B

8

REF

N PACKAGE

16-LEAD PDIP

T

JMAX

T

JMAX

TOP VIEW

16
15
14
13
12
11
10

9

S PACKAGE

16-LEAD PLASTIC SO

= 150°C, θJA = 90°C/W (N)
= 150°C, θJA = 150°C/ W (S)

OUT C
OUT D
GND
IN D
IN D
IN C
IN C

–

V

+

–

+

–

ORDER PART

NUMBER

LTC1443CN
LTC1443CS
LTC1443IN
LTC1443IS

Current:

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

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

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

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

Power Dissipation.............................................. 500mW
Operating Temperature Range

Commercial ............................................ 0°C to 70°C

Industrial ............................................ – 40°C to 85°C

1

OUT B

2

OUT A

+

3

V

–

4

IN A

+

5

IN A

–

6

IN B

+

7

IN B

8

REF

N PACKAGE

16-LEAD PDIP

T

JMAX

T

JMAX

TOP VIEW

16
15
14
13
12
11
10

9

S PACKAGE

16-LEAD PLASTIC SO

= 150°C, θJA = 90°C/W (N)
= 150°C, θJA = 150°C/ W (S)

OUT C
OUT D
HYST
IN D
IN D
IN C
IN C

–

V

+

–

+

–

ORDER PART

NUMBER

LTC1444CN
LTC1444CS
LTC1444IN
LTC1444IS
LTC1445CN
LTC1445CS
LTC1445IN
LTC1445IS

Consult factory for Military grade parts.

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. V+ = 5V, V– = GND = 0V, unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply

+

V
I

CC

Comparator

V

OS

I

IN

V

CM

CMRR Common Mode Rejection Ratio V– to (V+ – 1.3V) 0.1 1.0 mV/V
PSRR Power Supply Rejection Ratio V+ = 2V to 11V 0.1 1.0 mV/V
Noise Voltage Noise 100Hz to 100kHz 20 µV
V

HYST

Supply Voltage Range ● 2.0 11.0 V
Supply Current IN+ = IN– = 80mV ● 5.5 8.5 µA

HYST = REF (LTC1444/LTC1445)

Comparator Input Offset Voltage VCM = 2.5V ● ±3.0 ±10.0 mV

+

Input Leakage Current (IN+, IN–)V

–

= V

IN

= 2.5V ● ±0.01 ±1.0 nA

IN

Input Leakage Current (HYST) LTC1444/LTC1445 ● ±0.02 ±1.0 nA
Comparator Input Common Mode Range ● V

–

V+ – 1.3V V

RMS

Hysteresis Input Voltage Range LTC1444, LTC1445 ● REF – 50mV REF V

2

LTC1443/LTC1444/LTC1445

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. V+ = 5V, V– = GND = 0V, unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

t

PD

V

OH

V

OL

Propagation Delay Overdrive = 10mV, C

Overdrive = 100mV, C

= 100pF 12 µs

OUT

= 100pF 4 µs

OUT

Output High Voltage IO = –15mA; LTC1443/LTC1445 ● V+ – 0.4V V
Output Low Voltage IO = 1.8mA; LTC1443 ● GND + 0.4V V

IO = 1.8mA; LTC1444/LTC1445 ● V– + 0.4V V

Reference

V

REF

Reference Voltage No Load, LTC1443 C Temp Range ● 1.170 1.182 1.194 V

I Temp Range ● 1.164 1.200 V

No Load, LTC1444/ C Temp Range ● 1.209 1.221 1.233 V

I

SOURCE

I

SINK

LTC1445

Reference Output Source Current ∆V
Reference Output Sink Current ∆V

∆V

≤ 1mV ● 100 200 µA

REF

≤ 2.5mV 10 15 µA

REF

≤ 5mV ● 10 15 µA

REF

I Temp Range

Noise Voltage Noise 100Hz to 100kHz 100 µV

● 1.203 1.239 V

RMS

The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
V+ = 3V, V– = GND = 0V, unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply

+

V
I

CC

Comparator

V

OS

I

IN

V

CM

CMRR Common Mode Rejection Ratio V– to (V+ –1.3V) 0.1 1.0 mV/V
PSRR Power Supply Rejection Ratio V+ = 2V to 11V 0.1 1.0 mV/V
Noise Voltage Noise 100Hz to 100kHz 100 µV
V

HYST

t

PD

V

OH

V

OL

Reference

V

REF

I

SOURCE

I

SINK

Noise Noise Voltage 100Hz to 100kHz 100 µV

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

Supply Voltage Range ● 2.0 11.0 V
Supply Current IN+ = IN– = 80mV, HYST = REF ● 58 µA

Comparator Input Offset Voltage VCM = 1.5V ● ±3.0 ±10.0 mV

+

Input Leakage Current (IN+, IN–)V

–

= V

IN

= 1.5V ● ±0.01 ±1.0 nA

IN

Input Leakage Current (HYST) LTC1444/LTC1445 ● ±0.02 ±1.0 nA
Comparator Input Common Mode Range ● V

–

V+ – 1.3V V

RMS

Hysteresis Input Voltage Range LTC1444/LTC1445 ● REF – 50mV REF V
Propagation Delay Overdrive = 10mV, C

Overdrive = 100mV, C

= 100pF 14 µs

OUT

= 100pF 5 µs

OUT

Output High Voltage IO = –10mA, LTC1443/LTC1445 ● V+ – 0.4V V
Output Low Voltage IO = 0.8mA; LTC1443 ● GND + 0.4V V

IO = 0.8mA; LTC1444/LTC1445 ● V– + 0.4V V

Reference Voltage No Load, LTC1443 C Temp Range ● 1.170 1.182 1.194 V

I Temp Range ● 1.164 1.200 V

No Load, LTC1444/ C Temp Range ● 1.209 1.221 1.233 V
LTC1445

Reference Output Source Current ∆V
Reference Output Sink Current ∆V

∆V

I Temp Range

≤ 1mV ● 60 120 µA

REF

≤ 2.5mV 10 15 µA

REF

≤ 5mV ● 10 15 µA

REF

● 1.203 1.239 V

RMS

3

LTC1443/LTC1444/LTC1445

LOAD CURRENT (mA)

REFERENCE VOLTAGE (V)

1.184

1.183

1.182

1.181

1.180

1.179

1.178

0.2 0.4 0.6 0.8

LTC1443/44/45 • TPC06

1.00.10 0.3 0.5 0.7 0.9

V+ = 5V
V

–

= GND

T

A

= 25°C

SOURCE

UW

TYPICAL PERFOR A CE CHARACTERISTICS

LTC1444/LTC1445
Hysteresis Control

80

60

40

20

(mV)

–

0

– IN

+

–20

IN

–40

–60

–80

0

10 20 40

V

REF

– V

HYST

30

(mV)

LTC1443/44/45 • TPC01

50

Supply Current vs Supply Voltage Supply Current vs Temperature

5.2
TA = 25°C

5.0

4.8

4.6

4.4

SUPPLY CURRENT (µA)

4.2

4.0

1.0

1.5 2.0 2.5 3.0
SUPPLY VOLTAGE (V)

LTC1443/44/45 • TPC02

5.8

5.4

5.0

4.6

4.2

3.8

SUPPLY CURRENT (µA)

3.4

3.0
–60

IN+ = (IN– + 100mV)

–

= GND (LTC1443)

V

V+ = 5V

–

= 0V

V

V+ = 5V

–

= –5V

V

–20 60

–40

080100 120

TEMPERATURE (°C)

20

V+ = 3V

–

V

= 0V

40

LTC1443/44/45 • TPC03

LTC1444/LTC1445 Reference
Voltage vs Temperature

1.224

1.220

1.216

1.212

REFERENCE VOLTAGE (V)

1.208
–60

LTC1443 Reference Output
Voltage vs Output Load Current

1.194

1.192

1.190

1.188

1.186

1.184

1.182

REFERENCE OUTPUT VOLTAGE (V)

1.180

0

V+ = 5V

–40 –20 0 20

TEMPERATURE (°C)

V+ = 5V

–

= GND

V

= 25°C

T

A

10 30

15 35 40 45

5

LOAD CURRENT (µA)

40 60 80 100 120

LTC1443/44/45 • TPC04

SINK

20

25

LTC1443/44/45 • TPC07

LTC1443 Reference Voltage
vs Temperature

1.186
V+ = 5V

–60

–

V

–40

= GND

–20

40

0

TEMPERATURE (°C)

60

20

1.184

1.182

1.180

1.178

1.176

1.174

REFERENCE VOLTAGE (V)

1.172

1.170

Comparator Output Voltage High
vs Load Current

5.0

4.0

3.0

2.0

OUTPUT VOLTAGE HIGH (V)

1.0

V+ = 2V

0

10 20 30 40

V+ = 5V

V+ = 3V

LOAD CURRENT (mA)

100

80

120 140

LTC1443/44/45 • TPC05

TA = 25°C

50 60

LTC1443/44/45 • TPC08

LTC1443 Reference Output
Voltage vs Output Load Current

Comparator Output Voltage Low
vs Load Current

2.5
TA = 25°C

2.0

1.5

V+ = 2V V+ = 3V V+ = 5V

1.0

OUTPUT VOLTAGE HIGH (V)

0.5

0

0

10 20

40

30 50 80

LOAD CURRENT (mA)

60 70

LTC1443/44/45 • TPC09

4