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

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

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

10 20

40

30 50 80

LOAD CURRENT (mA)

60 70

LTC1443/44/45 • TPC09

4

UW

TYPICAL PERFOR A CE CHARACTERISTICS

LTC1443/LTC1444/LTC1445

Comparator Response Time vs Input Overdrive

5

TA = 25°C

4

3

2

1

0

100

INPUT VOLTAGE (mV) OUTPUT VOLTAGE (V)

–1

100mV 10mV

50mV 20mV

20108

RESPONSE TIME (µs)

Comparator Short-Circuit Source Current vs Supply Voltage

160

140

120

100

80

60

SOURCE CURRENT (mA)

40

20

0

5

4

3

2

1

0

100

0

64

LTC1443/44/45 • TPC10

OUT CONNECTED TO

–

= GND = 0V

V

12 4

SUPPLY VOLTAGE (V)

3

INPUT VOLTAGE (mV) OUTPUT VOLTAGE (V)

LTC1443/44/45 • TPC13

Comparator Response Time vs Input Overdrives

TA = 25°C

100mV

–1

08

5

50mV

20mV

10mV

12

210

4

6

RESPONSE TIME (µs)

14

LTC1443/44/45 • TPC11

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

16

18

0

OUT CONNECTED TO V

213579

0

SUPPLY VOLTAGE (V)

Comparator Response Time vs Load Capacitance

12

10

8

6

4

2

0

t

PHL

t

PLH

20

LOAD CAPACITANCE (nF)

60

40

LTC1443/44/45 • TPC14

+

6

8

4

LTC1443/44/45 • TPC12

80

100

10

Supply Current vs Comparator Input Frequency

10000

1000

100

C

OUT

SUPPLY CURRENT (µA)

10

1

100 10k 100k10 1k

INPUT FREQUENCY (Hz)

C

= 15pF

OUT

= 55pF

C

OUT

LTC1329 • TPC15

= 5pF

Comparator Response Time at Low Supply Voltage

10000

1000

100

RESPONSE TIME (µs)

10

1

100mV OVERDRIVE

1.2 1.4 1.61.1 1.3 1.5

SUPPLY VOLTAGE (V)

20mV OVERDRIVE

LTC1443/44/45 • TPC16

5

LTC1443/LTC1444/LTC1445

U

PI FU CTIO S

1

OUT B

2

OUT A

3

+

V

–

4

IN A

+

5

IN A

–

IN B

6

+

7

IN B

8

REF

+

–

+

UU

LTC1443

–

1.182V

OUT C

OUT D

GND

+

IN D

+

IN C

V

1443/44/45 • PD01

16

15

14

1

OUT B

2

OUT A

3

+

V

–

+

13

–

12

–

4

IN A

+

5

IN A

–

+

11

–

10

–

9

–

IN B

6

+

7

IN B

8

REF

LTC1444/LTC1445

+

1.221V

16

OUT C

15

OUT D

14

HYST

+

–

IN D

+

IN C

1443/44/45 • PD02

+

13

–

12

+

11

–

10

–

9

V

OUT B (Pin 1): Comparator B Output. (Open-drain output for LTC1444). Output can source up to 40mA (LTC1443, LTC1445) and sink 5mA.

OUT A (Pin 2): Comparator A Output. (Open-drain output for LTC1444). Output can source up to 40mA (LTC1443, LTC1445) and sink 5mA.

V+ (Pin 3): Positive Supply. IN A– (Pin 4): Inverting Input of Comparator A. Input

common mode range from V– to V+ – 1.3V. Input current typically 10pA at 25°C.

IN A+ (Pin 5): Noninverting Input of Comparator A. Input common mode range from V– to V+ – 1.3V. Input current typically 10pA at 25°C.

IN B– (Pin 6): Inverting Input of Comparator B. Input common mode range from V– to V+ – 1.3V. Input current typically 10pA at 25°C.

IN B+ (Pin 7): Noninverting Input of Comparator B. Input common mode range from V– to V+ – 1.3V. Input current typically 10pA at 25°C.

V– (Pin 9): Negative Supply. Connect to ground for single supply operation on LTC1443.

IN C– (Pin10): Inverting Input of Comparator C. Input common mode range from V– to V+ – 1.3V. Input current typically 10pA at 25°C.

IN C+ (Pin 11): Noninverting Input of Comparator C. Input common mode range from V– to V+ – 1.3V. Input current typically 10pA at 25°C.

IN D– (Pin 12): Inverting Input of Comparator D. Input common mode range from V– to V+ – 1.3V. Input current typically 10pA at 25°C.

IN D+ (Pin 13): Noninverting Input of Comparator D. Input common mode range from V– to V+ – 1.3V. Input current typically 10pA at 25°C.

GND (Pin 14): LTC1443 Ground. Connect to V– for single supply operation.

HYST (Pin 14): LTC1444/LTC1445 Hysteresis Input. Connect to REF if not used. Input voltage range is from V to V

– 50mV.

REF

REF (Pin 8): Reference Output. With respect to V–. Can source up to 200µA and sink 15µA at 25°C. Drive 0.01µF bypass capacitor without oscillation.

6

LTC1443/LTC1444/LTC1445

U

UU

PI FU CTIO S

OUT D (Pin 15): Comparator D Output. (Open-drain output for LTC1444). Output can source up to 40mA (LTC1443, LTC1445) and sink 5mA.

WUUU

APPLICATIO S I FOR ATIO

The LTC1443/LTC1444/LTC1445 is a family of quad micropower comparators with a built-in reference (1.182V for the LTC1443 and 1.221V for the LTC1444/LTC1445). Features include programmable hysteresis (LTC1444/ LTC1445), wide supply voltage range (2V to 11V) and the ability of the reference to drive up to a 0.01µF capacitor without oscillation. The comparator CMOS outputs (LTC1443/LTC1445) can source up to 40mA while the LTC1444 has an open-drain output to V–. The supply current glitches that normally occur when the comparator output switches states have been eliminated.

Power Supplies

The comparator family operates from a single 2V to 11V supply. The LTC1443 includes a separate ground for the comparator output stage, allowing a split supply ranging from ±1V to ±5.5V. Connecting V– to GND on the LTC1443 allows single supply operation. If the comparator output is required to source more than 1mA or the supply source impedance is high, V+ should be bypassed with a 0.1µF capacitor.

OUT C (Pin 16): Comparator C Output. (Open-drain output for LTC1444). Output can source up to 40mA (LTC1443, LTC1445) and sink 5mA.

tions which helps minimize parasitic feedback through the supply pins.

Voltage Reference

The internal bandgap reference has a voltage of 1.182V for LTC1443 or 1.221V for LTC1444/LTC1445 referenced to V–. The reference accuracy is 1.5% from –40°C to 85°C. It can source up to 200µA and sink up to 15µA with a 5V supply. The reference can drive a bypass capacitor of up to

0.01µF without oscillation and by inserting a series resistor, capacitance values up to 100µF can be used (Figure 1).

REFERENCE

OUTPUT

R1

Figure 1. Damping the Reference Output

REF

LTC144X

C1

–

V

LTC1443/44/45 • F01

Comparator Inputs

The comparator inputs can swing from the negative supply (V–) to within 1.3V maximum of the positive supply (V+). The inputs can be forced 300mV below V– or above V+ without damage, and the typical input leakage current is only ±10pA.

Comparator Outputs

The LTC1443 comparator output swings between GND and V+ to assure TTL compatibility with a split supply. The LTC1444 and LTC1445 outputs swing between V– and V+. The outputs are capable of sourcing up to 40mA (LTC1443/ LTC1445) and sinking up to 5mA while still maintaining microampere quiescent currents. The output stage does not generate crowbar switching currents during transi-

Figure 2 shows the resistor value required for different capacitor values to achieve critical damping.

1000

100

10

RESISTOR VALUE (kΩ)

1

0.1

0.001

Figure 2. Damping Resistance vs Bypass Capacitor Value

0.01 0.1 101

CAPACITOR VALUE (µF)

LTC1443/44/45 • F02

7

LTC1443/LTC1444/LTC1445

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APPLICATIO S I FOR ATIO

Bypassing the reference can help prevent false tripping of the comparators by preventing glitches on the V+ or the reference output voltage. Figure 3 shows the bypassed reference output with a square wave applied to the V+ pin. Resistors R1 and R2 set 10mV of hysteresis, while R3 damps the reference response. Note that the comparator output doesn’t trip.

Hysteresis

Hysteresis can be added to the LTC1444/LTC1445 by connecting a resistor (R1) between the REF and HYST pins, and a second resistor (R2) from HYST to V– (Figure 4).

3

+

5V TO 8V

R2

2.4M

R1

10k

R3 430Ω

C1

1.0µF

IN A

5

IN A

4

14

HYST

REF

8

Figure 3a. V+ Glitching Test Circuit

V

+

2

–

OUT

–

LTC1445

–

V

9

LTC1443/44/45 • F03

The difference between the upper and lower threshold voltages or hysteresis voltage band (VHB) is equal to twice the voltage difference between the REF and HYST pins. When more hysteresis is added, the upper threshold increases the same amount as the lower threshold decreases. The maximum voltage allowed between REF and HYST is 50mV, producing a maximum hysteresis voltage band of 100mV. If hysteresis is not wanted, the HYST pin should be shorted to REF. Acceptable values for I

range from 0.1µA to 5µA. If

REF

2.4M is chosen for R2, then R1(kΩ) = VHB (mV).

8V

+

V

5V

V

REF

2mV/DIV

OUT

2ms/DIV

Figure 3b. V+ Glitching Response

LTC1443/1444/1445 • TA02

8

I

REF

R1

R2

REF

LTC1445

14

HYST

9

LTC1443/44/45 • F04

R1 =

R2 =

Figure 4. Programmable Hysteresis

V

HB

(2)(I

)

REF

V

HB

1.221V –

()

I

2

REF

WUUU

APPLICATIO S I FOR ATIO

LTC1443/LTC1444/LTC1445

5V

Level Detector

V2

R6

1.82M 1%

V1

R2

3.40M 1%

R7

1.21M 1%

R1

1.21M 1%

Figure 5. Glitch-Free Level Detector with Hysteresis

R3

15k, 1%

R4

2.4M 1%

R5 430Ω 5%

C1

1.0µF

IN B

7

IN B

6

IN A

5

IN A

4

14

HYST

REF

8

3

+

V

+

–

+

–

9

1/2LTC1444

–

V

LTC1443/44/45 • F05

OUT B

OUT A

4. Choose the values for R3 and R4 to set the hysteresis.

R8 2M 1%

1

2

The LTC1444 is ideal for use as a multisupply micropower level detector as shown in Figure 5.

R1 and R2 form a voltage divider from V1 to the noninverting comparator A input. R6 and R7 are used to divide down V2, while R8 is the output pull-up resistor for the comparator outputs. R3 and R4 set the hysteresis voltage and R5 and C1 bypass the reference output. The following design procedure can be used to select the component values:

1. Choose the V1 voltage trip level, in this example 4.65V.

2. Calculate the required resistive divider ratio. Ratio = V

REF/VIN

Ratio = 1.221V/4.65V = 0.263

3. Choose the required hysteresis voltage band at the input,

V

, in this example 60mV. Calculate the hysteresis

HBIN

voltage band referred to the comparator input VHB.

VHB = (V

HBIN

)(Ratio) VHB = (60mV)(0.263) VHB = 15.78mV

R4 = 2.4M R3(kΩ) = VHB = 15k

5. Choose the values for R1 and R2 to set the trip point. R1 = V

REF/IBIAS

=

RR

21

()

RM

2121

=

.

()

RM

2340

=

.

= 1.221V/1µA ≈ 1.21M

 

V

REF

IN

+

V

 



HB

2

1

−

   

1 221

.

465

.

V

+

V

15



   



mV 2

 

1

−

 



Using the same equations, R6 and R7 are 1.82M and 1.21M respectfully to set the trip level at 3V for V2.

9

LTC1443/LTC1444/LTC1445

U

PACKAGE DESCRIPTIO

Dimensions in inches (millimeters) unless otherwise noted.

0.255 ± 0.015* (6.477 ± 0.381)

N Package

16-Lead PDIP (Narrow 0.300)

(LTC DWG # 05-08-1510)

14

15

16

2

1

3

0.770* (19.558)

13

4

MAX

12

11

6

5

910

8

7

0.300 – 0.325

(7.620 – 8.255)

0.009 – 0.015

(0.229 – 0.381)

+0.035

0.325

–0.015 +0.889

8.255

()

–0.381

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)

0.020

(0.508)

MIN

0.130 ± 0.005

(3.302 ± 0.127)

0.125

(3.175)

MIN

0.100

(2.54)

BSC

0.045 – 0.065

(1.143 – 1.651)

0.065

(1.651)

TYP

0.018 ± 0.003

(0.457 ± 0.076)

N16 1098

10

PACKAGE DESCRIPTIO

LTC1443/LTC1444/LTC1445

U

Dimensions in inches (millimeters) unless otherwise noted.

S Package

16-Lead Plastic Small Outline (Narrow 0.150)

(LTC DWG # 05-08-1610)

0.386 – 0.394* (9.804 – 10.008)

13

16

14

15

12

11

10

9

0.010 – 0.020

(0.254 – 0.508)

0.008 – 0.010

(0.203 – 0.254)

*

DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

**

DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

× 45°

0° – 8° TYP

0.016 – 0.050

(0.406 – 1.270)

0.228 – 0.244

(5.791 – 6.197)

0.053 – 0.069

(1.346 – 1.752)

0.014 – 0.019

(0.355 – 0.483)

TYP

0.150 – 0.157** (3.810 – 3.988)

4

5

0.050

(1.270)

BSC

3

2

1

7

6

8

0.004 – 0.010

(0.101 – 0.254)

S16 1098

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

LTC1443/LTC1444/LTC1445

U

TYPICAL APPLICATIO

Single Cell to 5V Supply

R1

1.1M 5%

R2

82.5k 1%

1 CELL LITHIUMION BATTERY

C2, C3: AUX TPSD107M010R0100 OR

R3 1M 1%

SANYO OS-CON 16SA100M

R5 51k 5%

R4

2.4M 5%

5

+

V

1/4 LTC1444

4

–

6

1/4 LTC1444

+

HYST

7

R6 430Ω 5%

C1 1µF

3

+

A

B

14

51k

5%

8REF

–

9V

2

R7

1

LTC1444 REF

L1

10µH

SUMIDA

CD54-100

+

C2 100µF

NC NC

6

V

IN

3

SHDN

LT1300

5

I

LIM

2

SEL PWR GND GND

81

1N5817

7

SW

SENSE

D1

4

3

MMFT2955ETI

+

C3 100µF

1

2, 4

267k

1%

R8 732k 1%

11

R9

+

1/4 LTC1444

10

–

C

0.22µF

Q1

161513

C4

R10

3.37M 5%

+

1/4 LTC1444

12

–

R11 51k 5%

R12

D

51k

5%

NMI

RESET

LTC1443/44/45 • F06

V

CC

µP

RELATED PARTS

PART NUMBER DESCRIPTION COMMENTS

LT®1034 Micropower Dual Reference 1.2V or 2.5V with 7V Auxiliary Reference LT1179 Quad Micropower Single Supply Precision Op Amp 17µA Max per Amplifier LTC1285/LTC1288 3V Micropower Sampling 12-Bit ADCs SO-8 Package, Auto Shutdown to 1nA LT1389 Nanopower Precision Shunt Reference 800nA Operating Current, 0.05% Accuracy LTC1440/LTC1441/LTC1442 Ultralow Power Single/Dual Comparator with Reference 2.8µA Typical Quiescent Current LT1495 Dual Precision Rail-to-Rail Input and Output Op Amp 1.5µA Max per Amplifier LT1521 300mA Low Dropout Regulator 12µA Quiescent Current LT1634 Micropower Precision Shunt Reference 10µA Operating Current, 0.05% Accuracy

12

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ● FAX: (408) 434-0507

●

www.linear-tech.com

144345fa LT/TP 0100 2K REV A • PRINTED IN USA

 LINEAR TECHNOLOGY CORPORATION 1995