LT1460ACS8-2.5_技术文档

LT1460-2.5

Micropower Precision

Series Reference

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DESCRIPTIO

FEATURES

The LT^®1460-2.5 is a micropower bandgap reference that

combines very high accuracy and low drift with low power

dissipation and small package size. This series reference

uses curvature compensation to obtain low temperature

coefficient and trimmed precision thin-film resistors to

achievehighoutputaccuracy. Thereferencewillsupplyupto

20mA,makingitidealforprecisionregulatorapplications,yet

it is almost totally immune to input voltage variations.

■

Trimmed to High Accuracy: 0.075% Max

■

Low Drift: 10ppm/°C Max

■

Industrial Temperature Range SO Package

Temperature Coefficient Guaranteed to 125

Low Supply Current: 130µA Max

Minimum Output Current: 20mA

No Output Capacitor Required

°C

Reverse Battery Protection

Minimum Input/Output Differential: 0.9V

Available in Small MSOP Package

This series reference provides supply current and power

dissipation advantages over shunt references that must idle

the entire load current to operate. Additionally, the LT1460-

2.5 does not require an output compensation capacitor, but

it is stable with capacitive loads. This feature is important in

critical applications where PC board space is a premium or

fast settling is demanded. Reverse battery protection keeps

the reference from conducting current and being damaged.

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APPLICATIO S

■

Handheld Instruments

■

Precision Regulators

■

A/D and D/A Converters

Power Supplies

Hard Disk Drives

■

The LT1460-2.5 is available in the 8-lead MSOP, SO, PDIP

and the 3-lead TO-92 packages. It is also available in the

SOT-23 package (see separate data sheet LT1460S3-2.5).

■

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

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TYPICAL APPLICATIO

Typical Distribution of Output Voltage

S8 Package

Basic Connection

20

1400 PARTS

18

LT1460-2.5

FROM 2 RUNS

16

3.4V

TO 20V

2.5V

IN

OUT

14

12

10

8

C1

0.1µF

GND

1460-2.5 TA01

6

4

2

0

–0.10

–0.06 –0.02 0 0.02

0.06

0.10

OUTPUT VOLTAGE ERROR (%)

1460-2.5 TA02

1

LT1460-2.5

ABSOLUTE MAXIMUM RATINGS

W W

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(Note 1)

Input Voltage ........................................................... 30V

Reverse Voltage.................................................... –15V

Output Short-Circuit Duration, T_A= 25°C

Specified Temperature Range

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

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

Storage Temperature Range (Note 2) ... –65°C to 150°C

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

V_IN> 10V........................................................... 5 sec

V_IN≤ 10V ................................................... Indefinite

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PACKAGE/ORDER INFORMATION

TOP VIEW

BOTTOM VIEW

DNC* 1

8 DNC*

7 DNC*

3

2

1

DNC*

1

2

3

4

DNC*

8

7

6

5

V

2

IN

*

CONNECTED INTERNALLY.

DO NOT CONNECT

EXTERNAL CIRCUITRY

TO THESE PINS

V

GND

6 V

DNC* 3

GND 4

IN

OUT

V

OUT

IN

5 DNC*

DNC*

GND

V

OUT

MS8 PACKAGE

DNC*

8-LEAD PLASTIC MSOP

*CONNECTED INTERNALLY.

DO NOT CONNECT EXTERNAL

CIRCUITRY TO THESE PINS

Z PACKAGE

3-LEAD TO-92 PLASTIC

N8 PACKAGE

8-LEAD PDIP

S8 PACKAGE

8-LEAD PLASTIC SO

T_JMAX= 125°C, θ_JA= 130°C/ W (N8)

_JMAX= 125°C, θ_JA= 190°C/ W (S8)

T_JMAX= 125°C, θ_JA= 250°C/ W

T

T_JMAX= 125°C, θ_JA= 160°C/ W

ORDER PART NUMBER

LT1460ACN8-2.5

LT1460BIN8-2.5

LT1460ACS8-2.5 LT1460LHS8-2.5

LT1460GCZ-2.5

LT1460GIZ-2.5

LT1460CCMS8-2.5

LT1460FCMS8-2.5

LT1460BIS8-2.5

LT1460MHS8-2.5

LT1460DCN8-2.5 LT1460DCS8-2.5

LT1460EIN8-2.5

LT1460EIS8-2.5

MS8 PART MARKING

S8 PART MARKING

LTAA

LTAB

1460A2

460BI2

1460D2

460EI2

460LH2

460MH2

Consult factory for Military grade parts.

Available Options

TEMPERATURE

COEFFICIENT

PACKAGE TYPE

S8

ACCURACY

N8

MS8

Z

TEMPERATURE

0°C to 70°C

(%)

0.075

0.10

0.125

0.15

0.25

0.20

(ppm/°C)

10

LT1460ACN8-2.5

LT1460BIN8-2.5

LT1460ACS8-2.5

LT1460BIS8-2.5

–40°C to 85°C

0°C to 70°C

10

15

LT1460CCMS8-2.5

0°C to 70°C

20

LT1460DCN8-2.5

LT1460EIN8-2.5

LT1460DCS8-2.5

LT1460EIS8-2.5

–40°C to 85°C

0°C to 70°C

20

25

LT1460FCMS8-2.5

0°C to 70°C

25

LT1460GCZ-2.5

LT1460GIZ-2.5

–40°C to 85°C

–40°C to 85°C/125°C

–40°C to 125°C

25

20/50

50

LT1460LHS8-2.5

LT1460MHS8-2.5

2

LT1460-2.5

ELECTRICAL CHARACTERISTICS

V_IN= 5V, I_OUT= 0, T_A= 25°C unless otherwise specified.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Output Voltage (Note 3)

LT1460ACN8, ACS8

LT1460BIN8, BIS8, CCMS8, DCN8, DCS8

LT1460EIN8, EIS8

2.49813

–0.075

2.500

2.50188

0.075

V

%

2.4975

–0.10

2.500

2.5025

0.10

V

%

2.49688

–0.125

2.500 2.50313

0.125

V

%

LT1460FCMS8

2.49625

–0.15

2.500 2.50375

0.15

V

%

LT1460GCZ, GIZ

2.49375

–0.25

2.500 2.50625

0.25

V

%

LT1460LHS8, MHS8

2.495

–0.20

2.500

2.505

0.20

V

%

Output Voltage Temperature Coefficient (Note 4)

T

≤ T ≤ T

MIN J MAX

LT1460ACN8, ACS8, BIN8, BIS8

LT1460CCMS8

LT1460DCN8, DCS8, EIN8, EIS8

LT1460FCMS8, GCZ, GIZ

LT1460LHS8

LT1460MHS8

●

5

7

10

12

10

25

10

15

20

25

20

50

ppm/°C

–40°C to 85°C

–40°C to 125°C

Line Regulation

3.4V ≤ V ≤ 5V

30

60

80

ppm/V

IN

●

5V ≤ V ≤ 20V

10

25

35

ppm/V

IN

Load Regulation Sourcing (Note 5)

I

= 100µA

= 10mA

= 20mA

1500

80

2800

3500

ppm/mA

OUT

135

180

ppm/mA

70

100

140

ppm/mA

0°C to 70°C

Thermal Regulation (Note 6)

Dropout Voltage (Note 7)

∆P = 200mW

0.5

2.5

0.9

ppm/mW

V

– V , ∆V

≤ 0.1%, I

= 0

●

IN

OUT

– V , ∆V

= 10mA

1.3

1.4

V

OUT

Output Current

Reverse Leakage

Supply Current

Short V

to GND

40

0.5

100

mA

OUT

V

= –15V

●

10

µA

IN

130

165

µA

Output Voltage Noise (Note 8)

0.1Hz ≤ f ≤ 10Hz

10Hz ≤ f ≤ 1kHz

10

µV

P-P

µV

RMS

Long-Term Stability of Output Voltage, S8 Pkg (Note 9)

Hysteresis (Note 10)

40

ppm/√kHr

∆T = –40°C to 85°C

∆T = 0°C to 70°C

160

25

ppm

3

LT1460-2.5

ELECTRICAL CHARACTERISTICS

The

●

denotes specifications which apply over the specified temperature

is 10 sec. RMS noise is measured with a single highpass filter at 10Hz and

a 2-pole lowpass filter at 1kHz. The resulting output is full wave rectified

and then integrated for a fixed period, making the final reading an average

as opposed to RMS. A correction factor of 1.1 is used to convert from

average to RMS and a second correction of 0.88 is used to correct for the

nonideal bandpass of the filters.

range.

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: If the part is stored outside of the specified temperature range, the

output may shift due to hysteresis.

Note 9: Long-term stability typically has a logarithmic characteristic and

therefore, changes after 1000 hours tend to be much smaller than before

that time. Total drift in the second thousand hours is normally less than

one third that of the first thousand hours with a continuing trend toward

reduced drift with time. Significant improvement in long-term drift can be

realized by preconditioning the IC with a 100 hour to 200 hour, 125°C

burn-in. Long-term stability will also be affected by differential stresses

between the IC and the board material created during board assembly. See

PC Board Layout in the Applications Information section.

Note 10: Hysteresis in output voltage is created by package stress that

differs depending on whether the IC was previously at a higher or lower

temperature. Output voltage is always measured at 25°C, but the IC is

cycled to 85°C or –40°C before successive measurements. Hysteresis is

roughly proportional to the square of the temperature change. Hysteresis

is not normally a problem for operational temperature excursions where

the instrument might be stored at high or low temperature.

Note 3: ESD (Electrostatic Discharge) sensitive device. Extensive use of

ESD protection devices are used internal to the LT1460, however, high

electrostatic discharge can damage or degrade the device. Use proper ESD

handling precautions.

Note 4: Temperature coefficient is measured by dividing the change in

output voltage by the specified temperature range. Incremental slope is

also measured at 25°C.

Note 5: Load regulation is measured on a pulse basis from no load to the

specified load current. Output changes due to die temperature change

must be taken into account separately.

Note 6: Thermal regulation is caused by die temperature gradients created

by load current or input voltage changes. This effect must be added to

normal line or load regulation. This parameter is not 100% tested.

Note 7: Excludes load regulation errors.

Note 8: Peak-to-peak noise is measured with a single highpass filter at

0.1Hz and 2-pole lowpass filter at 10Hz. The unit is enclosed in a still-air

environment to eliminate thermocouple effects on the leads. The test time

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TYPICAL PERFORMANCE CHARACTERISTICS

Minimum Input-Output Voltage

Differential

Load Regulation, Sourcing

Load Regulation, Sinking

6

5

4

3

2

1

0

100

10

80

70

60

50

40

30

20

10

0

125°C

25°C

–55°C

25°C

125°C

1

–55°C

0.1

1

10

100

0

0.5

1.0

1.5

2.0

2.5

0

0.5

1.0

1.5

OUTPUT CURRENT (mA)

INPUT-OUTPUT VOLTAGE (V)

OUTPUT CURRENT (mA)

1460-2.5 G01

1460-2.5 G02

1460-2.5 G03

4

LT1460-2.5

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TYPICAL PERFORMANCE CHARACTERISTICS

Output Voltage Temperature Drift

Supply Current vs Input Voltage

Line Regulation

2.5014

2.5010

2.5006

2.5002

2.4998

2.4994

2.4990

2.503

2.502

2.501

2.500

2.499

2.498

175

150

125

100

75

3 TYPICAL PARTS

125°C

25°C

125°C

25°C

–55°C

50

–55°C

25

0

–50

0

25

50

75

100

0

5

10

15

20

0

2

4

6

8

10 12 14 16 18 20

–25

TEMPERATURE (°C)

INPUT VOLTAGE (V)

1460-2.5 G04

1460-2.5 G05

1460-2.5 G06

Power Supply Rejection Ratio

vs Frequency

Output Impedance vs Frequency

Transient Responses

90

80

70

60

50

40

30

20

10

0

1k

C = 0.1µF

L

10

1

C

= 0

L

100

0.1

10

1

0

I_OUT= 10mA

1460 G09

C = 1µF

L

–10

100

1k

10k

100k

1M

10

100

1k

10k

100k

1M

FREQUENCY (Hz)

1460-2.5 G08

1460-2.5 G07

Long-Term Drift

Three Typical Parts (S8 Package)

Output Voltage Noise Spectrum

Output Noise 0.1Hz to 10Hz

1000

2.5000

2.4998

2.4996

2.4994

2.4992

2.4990

100

0

1

2

3

4

5

6

7

8

9

10

0

200

400

600

800

1000

10

100

1k

10k

100k

TIME (SEC)

TIME (HOURS)

FREQUENCY (Hz)

1460-2.5 G12

1460-2.5 G10

1460-2.5 G11

5

LT1460-2.5

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APPLICATIONS INFORMATION

Longer Battery Life

response of the LT1460-2.5 with a R_S= 2Ω and C_L= 1µF.

R_Sshould not be made arbitrarily large because it will limit

the load regulation.

Series references have a large advantage over older shunt

style references. Shunt references require a resistor from

the power supply to operate. This resistor must be chosen

to supply the maximum current that can ever be de-

manded by the circuit being regulated. When the circuit

beingcontrolledisnotoperatingatthismaximumcurrent,

the shunt reference must always sink this current, result-

ing in high dissipation and short battery life.

2.5V

V_GEN

1.5V

V_OUT

R_L= 10k

R_L= 1k

V_OUT

The LT1460-2.5 series reference does not require a cur-

rent setting resistor and can operate with any supply

voltage from V_OUT+ 0.9V to 20V. When the circuitry being

regulated does not demand current, the LT1460-2.5 re-

duces its dissipation and battery life is extended. If the

reference is not delivering load current it dissipates only

500µW on a 5V supply, yet the same configuration can

deliver 20mA of load current when demanded.

1µs/DIV

1460 F02

Figure 2. C_L= 0

2.5V

1.5V

V_GEN

Capacitive Loads

V_OUT

R_L= 10k

R_L= 1k

The LT1460-2.5 is designed to be stable with capacitive

loads. With no capacitive load, the reference is ideal for

fast settling or applications where PC board space is a

premium. The test circuit shown in Figure 1 is used to

measure the response time for various load currents and

load capacitors. The 1V step from 2.5V to 1.5V produces

a current step of 1mA or 100µA for R_L= 1k or R_L= 10k.

Figure 2 shows the response of the reference with no load

capacitance.

V_OUT

20µs/DIV

1460 F03

Figure 3. C_L= 0.01µF

V

R

L

OUT

S

V

= 5V

LT1460-2.5

IN

V

GEN

2.5V

1.5V

C

IN

C

The reference settles to 2.5mV (0.1%) in less than 1µs for

a100µApulseandto0.1%in1.5µswitha1mAstep.When

load capacitance is greater than 0.01µF, the reference

begins to ring due to the pole formed with the output

impedance. Figure 3 shows the response of the reference

toa1mAand100µAloadwitha0.01µFloadcapacitor. The

ringing can be greatly reduced with a DC load as small as

200µA. With large output capacitors, ≥ 1µF, the ringing

can be reduced with a small resistor in series with the

reference output as shown in Figure 4. Figure 5 shows the

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0.1µF

1460-2.5 F04

Figure 4. Isolation Resistor Test Circuit

2.5V

1.5V

V_GEN

R

_L= 1k,

V_OUT

R_S= 0

R

L

R_L= 1k,

R_S= 2Ω

V

OUT

V_OUT

V

= 5V

LT1460-2.5

IN

V

GEN

2.5V

1.5V

C

IN

C

L

0.1µF

0.1ms/DIV

1460 F05

1460-2.5 F01

Figure 1. Response Time Test Circuit

Figure 5. Effect of R_Sfor C_L= 1µF

6

LT1460-2.5

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APPLICATIONS INFORMATION

whichlimitstheinputdv/dttoapproximately5Vin2µsand

Fast Turn-On

the output settles quickly.

It is recommended to add a 0.1µF or larger input capacitor

to the input pin of the LT1460-2.5. This helps stability with

large load currents and speeds up turn-on. The LT1460-

2.5 can start in 2µs, but it is important to limit the dv/dt of

the input. Under light load conditions and with a very fast

input, internal nodes overslew and this requires finite

recovery time. Figure 6 shows the result of no bypass

capacitance on the input and no output load. In this case

the supply dv/dt is 5V in 30ns which causes internal

overslew,andtheoutputdoesnotbiasto2.5Vuntil500µs.

Figure 7 shows the effect of a 0.1µF bypass capacitor

Output Accuracy

Like all references, either series or shunt, the error budget

of the LT1460-2.5 is made up of primarily three compo-

nents: initial accuracy, temperature coefficient and load

regulation.Lineregulationisneglectedbecauseittypically

contributes only 30ppm/V, or 75µV for a 1V input change.

The LT1460-2.5 typically shifts less than 0.01% when

soldered into a PCB, so this is also neglected (see PC

Board Layout section). The output errors are calculated as

follows for a 100µA load and 0°C to 70°C temperature

range:

LT1460AC

5V

Initial accuracy = 0.075%

For I_O= 100µA,

0V

V_IN

3500ppm

mA

which is 0.035%.

∆V_OUT

=

0.1mA 2.5V = 875µV

V_OUT

(

)(

)

0V

0.2ms/DIV

1460 F06

Figure 6. C_IN= 0

For temperature 0°C to 70°C the maximum ∆T = 70°C,

10ppm

∆V

=

70°C 2.5V = 1.75mV

(

)(

)

OUT

°C

which is 0.07%.

5V

0V

V_IN

Total worst-case output error is:

0.075% + 0.035% + 0.070% = 0.180%.

V_OUT

Table 1 gives worst-case accuracy for the LT1460AC, CC,

DC, FC, GC from 0°C to 70°C and the LT1460BI, EI, GI

from –40°C to 85°C.

2µs/DIV

1460 F07

Figure 7. C_IN= 0.1µF

Table 1. Worst-Case Output Accuracy Over Temperature

I

LT1460AC

0.145%

0.180%

0.325%

0.425%

LT1460BI

0.225%

0.260%

0.405%

N/A

LT1460CC

0.205%

0.240%

0.385%

0.485%

LT1460DC

0.240%

0.275%

0.420%

0.520%

LT1460EI

0.375%

0.410%

0.555%

N/A

LT1460FC

0.325%

0.360%

0.505%

0.605%

LT1460GC

0.425%

0.460%

0.605%

0.705%

LT1460GI

0.562%

0.597%

0.742%

N/A

OUT

0

100µA

10mA

20mA

7

LT1460-2.5

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APPLICATIONS INFORMATION

PC Board Layout

reference and the leads can exit on the fourth side. This

“tongue” of PC board material can be oriented in the long

direction of the board to further reduce stress transferred

to the reference.

In 13- to 16-bit systems where initial accuracy and tem-

perature coefficient calibrations have been done, the me-

chanical and thermal stress on a PC board (in a cardcage

forinstance)canshifttheoutputvoltageandmaskthetrue

temperature coefficient of a reference. In addition, the

mechanical stress of being soldered into a PC board can

cause the output voltage to shift from its ideal value.

Surface mount voltage references (MS8 and S8) are the

most susceptible to PC board stress because of the small

amount of plastic used to hold the lead frame.

The results of slotting the PC boards of Figures 9a and

9b are shown in Figures 10a and 10b. In this example the

slots can improve the output shift from about 100ppm to

nearly zero.

1

2

3

A simple way to improve the stress-related shifts is to

mount the reference near the short edge of the PC board,

or in a corner. The board edge acts as a stress boundary,

oraregionwheretheflexureoftheboardisminimum. The

package should always be mounted so that the leads

absorb the stress and not the package. The package is

generally aligned with the leads parallel to the long side of

the PC board as shown in Figure 9a.

4

1460-2.5 F08

Figure 8. Flexure Numbers

2

A qualitative technique to evaluate the effect of stress on

voltage references is to solder the part into a PC board and

deformtheboardafixedamountasshowninFigure8. The

flexure #1 represents no displacement, flexure #2 is

concave movement, flexure #3 is relaxation to no dis-

placement and finally, flexure #4 is a convex movement.

This motion is repeated for a number of cycles and the

relative output deviation is noted. The result shown in

Figure 9a is for two LT1460S8-2.5s mounted vertically

andFigure9bisfortwoLT1460S8-2.5smountedhorizon-

tally. ThepartsorientedinFigure9aimpartlessstressinto

the package because stress is absorbed in the leads.

Figures9aand9bshowthedeviationtobebetween125µV

and 250µV and implies a 50ppm and 100ppm change

respectively. This corresponds to a 13- to 14-bit system

andisnotaproblemformost10-to12-bitsystemsunless

the system has a calibration. In this case, as with tempera-

ture hysteresis, this low level can be important and even

more careful techniques are required.

1

LONG DIMENSION

0

–1

0

40

10

20

FLEXURE NUMBER

30

1460-2.5 F09a

Figure 9a. Two Typical LT1460S8-2.5s, Vertical

Orientation Without Slots

2

1

LONG DIMENSION

0

The most effective technique to improve PC board stress

is to cut slots in the board around the reference to serve as

a strain relief. These slots can be cut on three sides of the

–1

0

40

10

20

30

1460-2.5 F09b

FLEXURE NUMBER

Figure 9b. Two Typical LT1460S8-2.5s, Horizontal

Orientation Without Slots

8

LT1460-2.5

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APPLICATIONS INFORMATION

2

1

0

SLOT

–1

0

–1

0

40

10

20

30

10

20

30

FLEXURE NUMBER

1460-2.5 F10a

1460-2.5 F10b

Figure 10a. Same Two LT1460S8-2.5s in Figure 9a,

but With Slots

Figure 10b. Same Two LT1460S8-2.5s in Figure 9b,

but With Slots

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SI PLIFIED SCHE ATIC

V

CC

V

OUT

51k

48k

GND

1460-2.5 SS

9

LT1460-2.5

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PACKAGE DESCRIPTION ^{Dimensions in inches (millimeters) unless otherwise noted.}

MS8 Package

8-Lead Plastic MSOP

(LTC DWG # 05-08-1660)

0.118 ± 0.004*

(3.00 ± 0.102)

8

7

6

5

0.040 ± 0.006

(1.02 ± 0.15)

0.034 ± 0.004

(0.86 ± 0.102)

0.007

(0.18)

0° – 6° TYP

0.118 ± 0.004**

(3.00 ± 0.102)

SEATING

PLANE

0.192 ± 0.004

(4.88 ± 0.10)

0.012

(0.30)

REF

0.021 ± 0.006

(0.53 ± 0.015)

0.006 ± 0.004

(0.15 ± 0.102)

0.0256

(0.65)

TYP

MSOP (MS8) 1197

1

2

3

4

*

DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,

PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.

INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

N8 Package

8-Lead PDIP (Narrow 0.300)

(LTC DWG # 05-08-1510)

0.400*

(10.160)

MAX

0.130 ± 0.005

0.300 – 0.325

0.045 – 0.065

(3.302 ± 0.127)

(1.143 – 1.651)

(7.620 – 8.255)

8

1

7

6

5

0.065

(1.651)

TYP

0.255 ± 0.015*

(6.477 ± 0.381)

0.009 – 0.015

(0.229 – 0.381)

0.125

0.020

(0.508)

MIN

(3.175)

MIN

+0.035

–0.015

2

4

3

0.325

0.100 ± 0.010

(2.540 ± 0.254)

0.018 ± 0.003

+0.889

8.255

(

)

(0.457 ± 0.076)

N8 1197

–0.381

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)

10

LT1460-2.5

U

PACKAGE DESCRIPTION ^{Dimensions in inches (millimeters) unless otherwise noted.}

S8 Package

8-Lead Plastic Small Outline (Narrow 0.150)

(LTC DWG # 05-08-1610)

0.189 – 0.197*

(4.801 – 5.004)

0.010 – 0.020

(0.254 – 0.508)

7

5

8

6

× 45°

0.053 – 0.069

(1.346 – 1.752)

0.004 – 0.010

(0.101 – 0.254)

0.008 – 0.010

(0.203 – 0.254)

0°– 8° TYP

0.150 – 0.157**

(3.810 – 3.988)

0.228 – 0.244

(5.791 – 6.197)

0.016 – 0.050

0.406 – 1.270

0.050

(1.270)

TYP

0.014 – 0.019

(0.355 – 0.483)

*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH

SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

SO8 0996

**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD

FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

1

3

4

2

Z Package

3-Lead Plastic TO-92 (Similar to TO-226)

(LTC DWG # 05-08-1410)

0.180 ± 0.005

(4.572 ± 0.127)

0.060 ± 0.005

0.060 ± 0.010

(1.524 ± 0.254)

(1.524± 0.127)

DIA

0.90

(2.286)

NOM

0.140 ± 0.010

(3.556 ± 0.127)

0.180 ± 0.005

(4.572 ± 0.127)

5°

NOM

10° NOM

0.500

(12.70)

MIN

0.050

(1.270)

MAX

UNCONTROLLED

LEAD DIMENSION

Z3 (TO-92) 0695

0.015 ± 0.002

(0.381 ± 0.051)

0.016 ± 0.003

(0.406 ± 0.076)

0.050 ± 0.005

(1.270 ± 0.127)

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 represen-

tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.

11

LT1460-2.5

U

TYPICAL APPLICATIONS

Boosted Output Current with No Current Limit

Boosted Output Current with Current Limit

+

V

≥ V

+ 2.8V

OUT

+

V

≥ (V

+ 1.8V)

+

OUT

D1*

LED

R1

220Ω

+

47µF

8.2Ω

R1

220Ω

47µF

2N2905

IN

2.5V

100mA

2.5V

100mA

LT1460-2.5 OUT

GND

LT1460-2.5 OUT

GND

+

2µF

+

2µF

SOLID

TANT

SOLID

TANT

GLOWS IN CURRENT LIMIT,

DO NOT OMIT

*

1460-2.5 TA04

1460-2.5 TA03

Handling Higher Load Currents

5V

40mA

+

47µF

R1*

63Ω

IN

10mA

V

OUT

LT1460-2.5 OUT

GND

2.5V

TYPICAL LOAD

CURRENT = 50mA

R

L

*SELECT R1 TO DELIVER 80% OF TYPICAL LOAD CURRENT.

LT1460 WILL THEN SOURCE AS NECESSARY TO MAINTAIN

PROPER OUTPUT. DO NOT REMOVE LOAD AS OUTPUT WILL

BE DRIVEN UNREGULATED HIGH. LINE REGULATION IS

DEGRADED IN THIS APPLICATION

1460-2.5 TA05

RELATED PARTS

PART NUMBER

DESCRIPTION

COMMENTS

LT1236

Precision Low Noise Reference

Precision Bandgap Reference

Precision 5V Reference

0.05% Max, 5ppm/°C Max, SO Package

0.05% Max, 5ppm/°C Max

LT1019

LT1027

0.02%, 2ppm/°C Max

1460fa LT/TP 1298 2K REV A • PRINTED IN USA

LINEAR TECHNOLOGY CORPORATION 1996

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

12

●

(408)432-1900 FAX:(408)434-0507 www.linear-tech.com


型号：	LT1460ACS8-2.5
厂家：	Linear
描述：	Micropower Precision Series Reference 微功率精准串联基准光电二极管
文件：	总12页 (文件大小：310K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LT1460ACS8-2.5 [Linear]

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