LT1460MHS8-5-PBF_技术文档

LT1460

Micropower Precision

Series Reference Family

Features

Description

The LT^®1460 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

achieve high output accuracy. The reference will supply

up to 20mA with excellent line regulation characteristics,

making it ideal for precision regulator applications.

n

Trimmed to High Accuracy: 0.075% Max

n

Low Drift: 10ppm/°C Max

n

Industrial Temperature Range

n

Temperature Coefficient Guaranteed to 125°C

n

Low Supply Current: 130µA Max (LT1460-2.5)

n

Minimum Output Current: 20mA

n

No Output Capacitor Required

n

Reverse Battery Protection

n

Minimum Input/Output Differential: 0.9V

This series reference provides supply current and power

dissipationadvantagesovershuntreferencesthatmustidle

the entire load current to operate. Additionally, the LT1460

does not require an output compensation capacitor, yet

is stable with capacitive loads. This feature is important

where PC board space is a premium or fast settling is

demanded. In the event of a reverse battery connection,

thesereferenceswillnotconductcurrent,andaretherefore

protected from damage.

n

Available in S0-8, MSOP-8, PDIP-8, TO-92 and

SOT- 23 Package

applications

n

Handheld Instruments

n

Precision Regulators

n

A/D and D/A Converters

Power Supplies

Hard Disk Drives

n

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

the 3-lead TO-92 and SOT23 packages.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

typical application

Typical Distribution of Output Voltage

Basic Connection

S8 Package

20

1400 PARTS

18

LT1460-2.5

3.4V

FROM 2 RUNS

16

2.5V

IN

OUT

TO 20V

C1

0.1µF

GND

14

12

10

8

1460 TA01

6

4

2

0

–0.10

–0.06

–0.02 0 0.02

0.06

0.10

OUTPUT VOLTAGE ERROR (%)

1460 TA02

1460fc

ꢀ

LT1460

absolute MaxiMuM ratings

(Note 1)

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

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

Specified Temperature Range (Note 10)

Commercial (C)........................................ 0°C to 70°C

Industrial (I).........................................–40°C to 85°C

High (H)............................................. –40°C to 125°C

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

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

Output Short-Circuit Duration, T = 25°C

A

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

IN

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

IN

pin conFiguration

TOP VIEW

IN 1

3 GND

OUT 2

S3 PACKAGE

3-LEAD PLASTIC SOT-23

= 125°C, θ = 228°C/W

T

JMAX

JA

TOP VIEW

DNC*

1

2

3

4

DNC*

1

2

3

4

8

7

6

5

DNC*

8

7

6

5

V

IN

V

IN

DNC*

GND

V

OUT

DNC*

GND

V

OUT

DNC*

N8 PACKAGE

8-LEAD PLASTIC DIP

S8 PACKAGE

8-LEAD PLASTIC SO

*CONNECTED INTERNALLY.

DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS

*CONNECTED INTERNALLY.

DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS

T

JMAX

= 150°C, θ = 130°C/W

T

JMAX

= 150°C, θ = 190°C/W

JA

TOP VIEW

BOTTOM VIEW

DNC* 1

8 DNC*

7 DNC*

1

2

3

V

2

IN

6 V

5 DNC*

DNC* 3

GND 4

OUT

V

IN

V

GND

OUT

MS8 PACKAGE

8-LEAD PLASTIC MSOP

*CONNECTED INTERNALLY.

DO NOT CONNECT EXTERNAL

CIRCUITRY TO THESE PINS

Z PACKAGE

3-LEAD TO-92 PLASTIC

= 150°C, θ = 160°C/W

T

JMAX

JA

T

= 150°C, θ = 250°C/W

JA

JMAX

1460fc

ꢁ

LT1460

orDer inForMation

Lead Free Finish

TAPE AND REEL (MINI)

LT1460HCS3-2.5#TRMPBF

LT1460JCS3-2.5#TRMPBF

LT1460KCS3-2.5#TRMPBF

LT1460HCS3-3#TRMPBF

LT1460JCS3-3#TRMPBF

LT1460KCS3-3#TRMPBF

LT1460HCS3-3.3#TRMPBF

LT1460JCS3-3.3#TRMPBF

LT1460KCS3-3.3#TRMPBF

LT1460HCS3-5#TRMPBF

LT1460JCS3-5#TRMPBF

LT1460KCS3-5#TRMPBF

LT1460HCS3-10#TRMPBF

LT1460JCS3-10#TRMPBF

LT1460KCS3-10#TRMPBF

TAPE AND REEL

PART MARKING* PACKAGE DESCRIPTION

SPECIFIED TEMPERATURE RANGE

0°C to 70°C

†

LT1460HCS3-2.5#TRMPBF

LT1460JCS3-2.5#TRPBF

LT1460KCS3-2.5#TRPBF

LT1460HCS3-3#TRPBF

LT1460JCS3-3#TRPBF

LT1460KCS3-3#TRPBF

LT1460HCS3-3.3#TRPBF

LT1460JCS3-3.3#TRPBF

LT1460KCS3-3.3#TRPBF

LT1460HCS3-5#TRPBF

LT1460JCS3-5#TRPBF

LT1460KCS3-5#TRPBF

LT1460HCS3-10#TRPBF

LT1460JCS3-10#TRPBF

LT1460KCS3-10#TRPBF

LTAC or LTH8

3-Lead Plastic SOT-23

†

LTAD or LTH8

0°C to 70°C

†

LTAE or LTH8

LTAN or LTH9

0°C to 70°C

†

0°C to 70°C

†

LTAP or LTH9

0°C to 70°C

†

LTAQ or LTH9

0°C to 70°C

†

LTAR or LTJ1

0°C to 70°C

†

LTAS or LTJ1

0°C to 70°C

†

LTAT or LTJ1

LTAK or LTJ2

0°C to 70°C

†

0°C to 70°C

†

LTAL or LTJ2

0°C to 70°C

†

LTAM or LTJ2

0°C to 70°C

†

LTAU or LTJ3

0°C to 70°C

†

LTAV or LTJ3

LTAW or LTJ3

0°C to 70°C

TRM = 500 pieces. *Temperature grades and parametric grades are identified by a label on the shipping container.

†

Product grades are identified with either part marking.

Consult LTC Marketing for parts specified with wider operating temperature ranges.

Consult LTC Marketing for information on lead based finish parts.

For more information on lead free part marking, go to: http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/

LEAD FREE FINISH

LT1460ACN8-2.5#PBF

LT1460BIN8-2.5#PBF

LT1460DCN8-2.5#PBF

LT1460EIN8-2.5#PBF

LT1460ACN8-5#PBF

LT1460BIN8-5#PBF

LT1460DCN8-5#PBF

LT1460EIN8-5#PBF

LT1460ACN8-10#PBF

LT1460BIN8-10#PBF

LT1460DCN8-10#PBF

LT1460EIN8-10#PBF

LT1460ACS8-2.5#PBF

LT1460BIS8-2.5#PBF

LT1460DCS8-2.5#PBF

LT1460EIS8-2.5#PBF

LT1460LHS8-2.5#PBF

LT1460MHS8-2.5#PBF

LT1460ACS8-5#PBF

LT1460BIS8-5#PBF

TAPE AND REEL

PART MARKING

PACKAGE DESCRIPTION

8-Lead Plastic DIP

8-Lead Plastic SO

SPECIFIED TEMPERATURE RANGE

0°C to 70°C

LT1460ACN8-2.5#TRPBF

LT1460BIN8-2.5#TRPBF

LT1460DCN8-2.5#TRPBF

LT1460EIN8-2.5#TRPBF

LT1460ACN8-5#TRPBF

LT1460BIN8-5#TRPBF

LT1460DCN8-5#TRPBF

LT1460EIN8-5#TRPBF

LT1460ACN8-10#TRPBF

LT1460BIN8-10#TRPBF

LT1460DCN8-10#TRPBF

LT1460EIN8-10#TRPBF

LT1460ACS8-2.5#TRPBF

LT1460BIS8-2.5#TRPBF

LT1460DCS8-2.5#TRPBF

LT1460EIS8-2.5#TRPBF

LT1460LHS8-2.5#TRPBF

LT1460MHS8-2.5#TRPBF

LT1460ACS8-5#TRPBF

LT1460BIS8-5#TRPBF

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

1460A2

460BI2

1460D2

460EI2

60LH25

60MH25

1460A5

460BI5

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

1460fc

ꢂ

LT1460

orDer inForMation

LEAD FREE FINISH

LT1460DCS8-5#PBF

LT1460EIS8-5#PBF

LT1460LHS8-5#PBF

LT1460MHS8-5#PBF

LT1460ACS8-10#PBF

LT1460BIS8-10#PBF

LT1460DCS8-10#PBF

LT1460EIS8-10#PBF

LT1460CCMS8-2.5#PBF

LT1460FCMS8-2.5#PBF

LT1460CCMS8-5#PBF

LT1460FCMS8-5#PBF

LT1460CCMS8-10#PBF

LT1460FCMS8-10#PBF

LT1460GCZ-2.5#PBF

LT1460GIZ-2.5#PBF

LT1460GCZ-5#PBF

TAPE AND REEL

PART MARKING

1460D5

460EI5

460LH5

460MH5

1460A1

460BI1

1460D1

460EI1

LTAA

PACKAGE DESCRIPTION

8-Lead Plastic SO

SPECIFIED TEMPERATURE RANGE

0°C to 70°C

LT1460DCS8-5#TRPBF

LT1460EIS8-5#TRPBF

LT1460LHS8-5#TRPBF

LT1460MHS8-5#TRPBF

LT1460ACS8-10#TRPBF

LT1460BIS8-10#TRPBF

LT1460DCS8-10#TRPBF

LT1460EIS8-10#TRPBF

LT1460CCMS8-2.5#TRPBF

LT1460FCMS8-2.5#TRPBF

LT1460CCMS8-5#TRPBF

LT1460FCMS8-5#TRPBF

LT1460CCMS8-10#TRPBF

LT1460FCMS8-10#TRPBF

LT1460GCZ-2.5#TRPBF

LT1460GIZ-2.5#TRPBF

LT1460GCZ-5#TRPBF

LT1460GIZ-5#TRPBF

8-Lead Plastic SO

–40°C to 85°C

0°C to 70°C

8-Lead Plastic SO

–40°C to 85°C

0°C to 70°C

8-Lead Plastic SO

–40°C to 85°C

0°C to 70°C

8-Lead Plastic SO

–40°C to 85°C

0°C to 70°C

8-Lead Plastic MSOP

3-Lead Plastic TO-92

LTAB

0°C to 70°C

LTAF

0°C to 70°C

LTAG

0°C to 70°C

LTAH

0°C to 70°C

LTAJ

0°C to 70°C

–40°C to 85°C

0°C to 70°C

LT1460GIZ-5#PBF

–40°C to 85°C

0°C to 70°C

LT1460GCZ-10#PBF

LT1460GIZ-10#PBF

LT1460GCZ-10#TRPBF

LT1460GIZ-10#TRPBF

–40°C to 85°C

Consult LTC Marketing for parts specified with wider operating temperature ranges.

Consult LTC Marketing for information on non-standard lead based finish parts.

For more information on lead free part marking, go to: http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/

available options

TEMPERATURE

PACKAGE TYPE

MS8

ACCURACY COEFFICIENT

N8

S8

Z

S3

TEMPERATURE

0°C to 70°C

(%)

0.075

0.10

0.125

0.15

0.25

0.20

0.40

0.50

(ppm/°C)

10

LT1460ACN8

LT1460BIN8

LT1460ACS8

LT1460BIS8

–40°C to 85°C

0°C to 70°C

10

15

LT1460CCMS8

LT1460FCMS8

0°C to 70°C

20

LT1460DCN8

LT1460EIN8

LT1460DCS8

LT1460EIS8

–40°C to 85°C

0°C to 70°C

20

25

0°C to 70°C

25

LT1460GCZ

LT1460GIZ

–40°C to 85°C

–40°C to 85°C/125°C

–40°C to 125°C

0°C to 70°C

25

20/50

50

LT1460LHS8

LT1460MHS8

20

LT1460HCS3

LT1460JCS3

LT1460KCS3

0°C to 70°C

20

0°C to 70°C

50

1460fc

ꢃ

LT1460

electrical characteristics

The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T_A= 25°C. V_IN= V_OUT+ 2.5V, I_OUT= 0 unless otherwise specified.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Output Voltage

LT1460ACN8-2.5, ACS8-2.5

2.49813

–0.075

2.50188

0.075

V

%

LT1460BIN8-2.5, BIS8-2.5, CCMS8-2.5,

DCN8-2.5, DCS8-2.5

2.4975

–0.10

2.5025

0.10

V

%

LT1460EIN8-2.5, EIS8-2.5

2.49688

–0.125

2.50313

0.125

V

%

LT1460FCMS8-2.5

2.49625

–0.15

2.50375

0.15

V

%

LT1460GCZ-2.5, GIZ-2.5

LT1460LHS8-2.5, MHS8-2.5

LT1460ACN8-5, ACS8-5

2.49375

–0.25

2.50625

0.25

V

%

2.495

–0.20

2.505

0.20

V

%

4.99625

–0.075

5.00375

0.075

V

%

LT1460BIN8-5, BIS8-5, CCMS8-5,

DCN8-5, DCS8-5

4.995

–0.10

5.005

0.10

V

%

LT1460EIN8-5, EIS8-5

4.99375

–0.125

5.00625

0.125

V

%

LT1460FCMS8-5

4.9925

–0.15

5.0075

0.15

V

%

LT1460GCZ-5, GIZ-5

LT1460LHS8-5, MHS8-5

LT1460ACN8-10, ACS8-10

4.9875

–0.25

5.0125

0.25

V

%

4.990

–0.20

5.010

0.20

V

%

9.9925

–0.075

10.0075

0.075

V

%

LT1460BIN8-10, BIS8-10, CCMS8-10,

DCN8-10, DCS8-10

9.990

–0.10

10.010

0.10

V

%

LT1460EIN8-10, EIS8-10

9.9875

–0.125

10.0125

0.125

V

%

LT1460FCMS8-10

9.985

–0.15

10.0015

0.15

V

%

LT1460GCZ-10, GIZ-10

9.975

–0.25

10.025

0.25

V

%

LT1460HC

LT1460JC

LT1460KC

–0.2

–0.4

–0.5

0.2

0.4

0.5

%

Output Voltage Temperature Coefficient (Note 3)

T

≤ T ≤ T

MIN J MAX

l

LT1460ACN8, ACS8, BIN8, BIS8

LT1460CCMS8

5

10

15

20

25

20

50

ppm/°C

7

LT1460DCN8, DCS8, EIN8, EIS8

LT1460FCMS8, GCZ, GIZ

LT1460LHS8

10

12

10

25

–40°C to 85°C

–40°C to 125°C

LT1460MHS8

l

LT1460HC

LT1460JC

LT1460KC

10

25

20

50

ppm/°C

1460fc

ꢄ

LT1460

electrical characteristics

The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T_A= 25°C. V_IN= V_OUT+ 2.5V, I_OUT= 0 unless otherwise specified.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Line Regulation

V

+ 0.9V ≤ V ≤ V

OUT

+ 2.5V

30

60

80

ppm/V

OUT

IN

l

LT1460A, LT1460B, LT1460C, LT1460D, LT1460E,

LT1460F, LT1460G, LT1460H, LT1460L, LT1460M

+ 2.5V ≤ V ≤ 20V

10

150

50

25

35

ppm/V

IN

LT1460HC, LT1460JC, LT1460KC

+ 0.9V ≤ V ≤ V

800

1000

ppm/V

IN

OUT

+ 2.5V ≤ V ≤ 20V

100

130

ppm/V

IN

Load Regulation Sourcing (Note 4)

I

= 100µA

= 10mA

= 20mA

1500

80

2800

3500

ppm/mA

LT1460A, LT1460B, LT1460C, LT1460D, LT1460E,

LT1460F, LT1460G, LT1460H, LT1460L, LT1460M

135

180

ppm/mA

70

100

140

ppm/mA

0°C to 70°C

LT1460HC, LT1460JC, LT1460KC

= 100µA

= 10mA

= 20mA

1000

50

3000

4000

ppm/mA

OUT

200

300

ppm/mA

20

70

100

ppm/mA

Thermal Regulation (Note 5)

0.5

2.5

ppm/mW

ΔP = 200mW

LT1460A, LT1460B, LT1460C, LT1460D, LT1460E,

LT1460F, LT1460G, LT1460H, LT1460L, LT1460M

LT1460HC, LT1460JC, LT1460KC

Dropout Voltage (Note 6)

2.5

10

ppm/mW

V

ΔP = 200mW

l

V

– V , I

= 0

0.9

IN

OUT OUT

– V , I

= 10mA

1.3

1.4

V

IN

OUT OUT

Output Current

Reverse Leakage

Supply Current

Short V

to GND

40

0.5

100

mA

µA

OUT

l

V

= –15V

10

IN

LT1460-2.5

130

165

µA

LT1460-5

125

190

115

145

160

215

175

225

µA

LT1460-10

270

360

µA

LT1460S3-2.5

LT1460S3-3

LT1460S3-3.3

LT1460S3-5

LT1460S3-10

145

175

µA

180

220

µA

180

220

µA

200

240

µA

270

350

µA

1460fc

ꢅ

LT1460

electrical characteristics

The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T_A= 25°C. V_IN= V_OUT+ 2.5V, I_OUT= 0 unless otherwise specified.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

µV

Output Voltage Noise (Note 7)

LT1460-2.5

0.1Hz ≤ f ≤ 10Hz

10Hz ≤ f ≤ 1kHz

10

P-P

LT1460A, LT1460B, LT1460C, LT1460D, LT1460E,

LT1460F, LT1460G, LT1460H, LT1460L, LT1460M

µV

RMS

LT1460-5

0.1Hz ≤ f ≤ 10Hz

10Hz ≤ f ≤ 1kHz

20

µV

P-P

RMS

LT1460-10

0.1Hz ≤ f ≤ 10Hz

10Hz ≤ f ≤ 1kHz

40

35

µV

P-P

RMS

LT1460HC, LT1460JC, LT1460KC

0.1Hz ≤ f ≤ 10Hz

10Hz ≤ f ≤ 1kHz

4

ppm (P-P)

ppm (RMS)

Long-Term Stability of Output Voltage (Note 8)

S8 Pkg

40

ppm/√kHr

LT1460HC, LT1460JC, LT1460KC

100

ppm/√kHr

Hysteresis (Note 9)

25

160

ppm

ΔT = 0°C to 70°C

ΔT = –40°C to 85°C

LT1460A, LT1460B, LT1460C, LT1460D, LT1460E,

LT1460F, LT1460G, LT1460H, LT1460L, LT1460M

l

LT1460HC, LT1460JC, LT1460KC

50

250

ppm

ΔT = 0°C to 70°C

ΔT = –40°C to 85°C

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.

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 pass band of the filters.

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

output may shift due to hysteresis.

Note 8: 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 9: 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. For

instruments that are stored at reasonably well-controlled temperatures

(within 20 or 30 degrees of operating temperature) hysteresis is generally

not a problem.

Note 3: 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 4: 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 5: 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 6: Excludes load regulation errors. For LT1460S3, ΔV

≤ 0.2%. For

OUT

all other packages, ΔV

≤ 0.1%.

OUT

Note 7: 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

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

Note 10: The LT1460S3 is guaranteed functional over the operating

temperature range of –40° to 85°C.

1460fc

ꢆ

LT1460

typical perForMance characteristics

LT1460-2.5 (N8, S8, MS8, Z Packages)

2.5V Minimum Input-Output

Voltage Differential

2.5V Load Regulation, Sourcing

2.5V Load Regulation, Sinking

100

10

6

5

4

3

2

1

0

80

70

60

50

40

30

20

10

0

125°C

25°C

–55°C

25°C

125°C

1

–55°C

0.1

0

0.5

1.0

1.5

2.0

2.5

0.1

1

10

100

0

0.5

1.0

1.5

INPUT-OUTPUT VOLTAGE (V)

OUTPUT CURRENT (mA)

1460 G02

1460 G03

1460 G01

2.5V Output Voltage

Temperature Drift

2.5V Supply Current vs Input

Voltage

2.5V Line Regulation

2.503

2.502

2.501

2.500

2.499

2.498

175

150

125

100

75

2.5014

2.5010

2.5006

2.5002

2.4998

2.4994

2.4990

3 TYPICAL PARTS

125°C

25°C

125°C

25°C

–55°C

50

–55°C

25

0

–50

0

25

50

75

100

–25

0

5

10

15

20

0

2

4

6

8

10 12 14 16 18 20

TEMPERATURE (°C)

INPUT VOLTAGE (V)

1460 G04

1460 G05

1460 G06

2.5V Power Supply Rejection

Ratio vs Frequency

2.5V Output Impedance vs

Frequency

2.5V 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

0

10

1

1460 G09

I

= 10mA

OUT

C = 1µF

L

–10

100

1k

10k

100k

1M

10

100

1k

10k

100k

1M

FREQUENCY (Hz)

1460 G08

1460 G07

1460fc

ꢇ

LT1460

typical perForMance characteristics

2.5V Output Voltage Noise

Spectrum

2.5V Long-Term Drift

Three Typical Parts (S8 Package)

2.5V 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 G11

1460 G12

1460 G10

LT1460-5 (N8, S8, MS8, Z Packages)

5V Minimum Input-Output Voltage

Differential

5V Load Regulation, Sourcing

5V Load Regulation, Sinking

6

5

4

3

2

1

0

100

10

100

90

80

70

60

50

40

30

20

10

0

125°C

25°C

125°C

25°C

–55°C

25°C

–55°C

1

–55°C

125°C

4

0.1

1

10

100

0

1

2

3

5

0

0.5

1.0

1.5

2.0

2.5

OUTPUT CURRENT (mA)

INPUT-OUTPUT VOLTAGE (V)

1460 G13

1460 G15

1460 G14

5V Output Voltage

Temperature Drift

5V Supply Current vs Input

Voltage

5V Line Regulation

5.004

5.002

5.000

4.998

4.996

4.994

200

180

160

140

120

100

80

5.002

5.000

4.998

4.996

4.994

4.992

3 TYPICAL PARTS

125°C

25°C

125°C

–55°C

60

–55°C

40

20

0

2

4

6

8

10 12 14 16 18 20

–50

0

25

50

75

100

0

–25

0

2

4

6

8

10 12 14 16 18 20

TEMPERATURE (°C)

INPUT VOLTAGE (V)

1460 G16

1460 G17

1460 G18

1460fc

ꢈ

LT1460

typical perForMance characteristics

LT1460-5 (N8, S8, MS8, Z Packages)

5V Power Supply Rejection Ratio

vs Frequency

5V Output Impedance vs

Frequency

5V Transient Responses

90

80

70

60

50

40

30

20

10

0

1k

100

10

C

= 0

10

1

L

C = 0.1µF

L

0.1

0

1

C = 1µF

L

1460 G21

0.2ms/DIV

I

= 10mA

OUT

0.1

100

1k

10k

100k

1M

10

100

1k

10k

100k

1M

FREQUENCY (Hz)

1460 G19

1460 G20

5V Output Voltage Noise

Spectrum

5V Output Noise 0.1Hz to 10Hz

3000

2000

1000

100

0

1

2

3

4

5

6

7

8

9

10

100

1k

10k

100k

FREQUENCY (Hz)

TIME (SEC)

1460 G22

1460 G23

LT1460-10 (N8, S8, MS8, Z Packages)

10V Minimum Input/Output

Voltage Differential

10V Load Regulation, Sourcing

10V Load Regulation, Sinking

10

9

100

90

80

70

60

50

40

30

20

10

0

8

7

10

25°C

6

5

125°C

25°C

–55°C

125°C

4

3

2

1

0

–55°C

25°C

125°C

1

–55°C

0.1

0

0.5

1.0

1.5

2.0

2.5

0.1

1

10

100

0

1

2

3

4

5

INPUT/OUTPUT VOLTAGE (V)

OUTPUT CURRENT (mA)

1460 G24

1460 G26

1460 G25

1460fc

ꢀ0

LT1460

typical perForMance characteristics

10V Output Voltage

Temperature Drift

10V Supply Current vs Input

Voltage

10V Line Regulation

10.006

10.002

9.998

9.994

9.990

9.986

9.982

400

360

320

280

240

200

160

120

80

10.004

10.000

9.996

9.992

9.988

9.984

9.980

3 TYPICAL PARTS

25°C

–55°C

25°C

–55°C

125°C

40

0

–50

0

25

50

75

100

0

2

4

6

8

10 12 14 16 18 20

6

8

14

16

18

20

–25

10

12

TEMPERATURE (°C)

INPUT VOLTAGE (V)

1460 G27

1460 G28

1460 G29

10V Power Supply Rejection

Ratio vs Frequency

10V Output Impedance vs

Frequency

10V Transient Responses

100

90

80

70

60

50

40

30

20

10

0

1000

100

10

C = 0µF

10

1

L

C = 0.1µF

L

0.1

0

C = 1µF

L

1

1460 G32

200µs/DIV

I

= 10mA

OUT

0.1

1

10

100

1000

0.01

0.1

1

10

100

1000

INPUT FREQUENCY (kHz)

FREQUENCY (kHz)

1460 G30

1460 G31

10V Output Voltage Noise

Spectrum

10V Output Noise 0.1Hz to 10Hz

10

1

0.1

0.01

0

2

4

6

8

10

12

14

0.1

1

10

100

FREQUENCY (kHz)

TIME (SEC)

1460 G33

1460 G34

1460fc

ꢀꢀ

LT1460

typical perForMance characteristics

Characteristic curves are similar for all voltage

options of the LT1460S3. Curves from the LT1460S3-2.5 and the LT1460S3-10 represent the extremes of the voltage options.

Characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output.

LT1460S3-2.5V Minimum Input-

Output Voltage Differential

LT1460S3-2.5V Load Regulation,

Sourcing

LT1460S3-2.5V Load Regulation,

Sinking

100

10

1

0

–0.5

–1.0

–1.5

–2.0

–2.5

–3.0

–3.5

–4.0

120

100

125°C

–55°C

80

60

25°C

125°C

–55°C

25°C

–55°C

40

20

0

125°C

0.1

1

10

100

0

0.5

1.0

1.5

2.0

2.5

0

1

2

3

4

5

INPUT-OUTPUT VOLTAGE (V)

OUTPUT CURRENT (mA)

1460 G36

1460 G35

1460 G37

LT1460S3-2.5V Output Voltage

Temperature Drift

LT1460S3-2.5V Supply Current

vs Input Voltage

LT1460S3-2.5V Line Regulation

2.502

2.501

2.500

2.499

2.498

2.497

2.496

2.495

2.494

2.503

2.502

2.501

2.500

250

200

150

100

50

THREE TYPICAL PARTS

25°C

125°C

–55°C

125°C

2.499

2.498

2.497

0

50

TEMPERATURE (°C)

100 125

–50 –25

0

25

75

0

2

4

6

8

10 12 14 16 18 20

5

10

15

0

20

INPUT VOLTAGE (V)

1460 G38

1460 G40

1460 G39

LT1460S3-2.5V Power Supply

Rejection Ratio vs Frequency

LT1460S3-2.5V Output Impedance

vs Frequency

LT1460S3-2.5V Transient

Response

80

70

60

50

40

30

20

10

0

1000

100

10

C

= 0µF

L

20

10

C

= 0.1µF

L

1

C

= 1µF

L

0.1

1

1460 G43

200µs/DIV

C

= 0µF

LOAD

0.1

1

10

100

1000

0.01

0.1

1

10

100

1000

FREQUENCY (kHz)

1460 G41

1460 G42

1460fc

ꢀꢁ

LT1460

typical perForMance characteristics

Characteristic curves are similar for all voltage

options of the LT1460S3. Curves from the LT1460S3-2.5 and the LT1460S3-10 represent the extremes of the voltage options.

Characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output.

LT1460S3-2.5V Output Voltage

Noise Spectrum

LT1460S3-2.5V Output Noise

0.1Hz to 10Hz

LT1460S3-10V Minimum Input-

Output Voltage Differential

1000

100

10

1

125°C

25°C

–55°C

100

0.1

TIME (2 SEC/DIV)

0

0.5

1.0

1.5

2.0

2.5

10

100

1k

10k

100k

1460 G45

INPUT-OUTPUT VOLTAGE (V)

FREQUENCY (Hz)

1460 G46

1460 G44

LT1460S3-10V Load Regulation,

Sourcing

LT1460S3-10V Load Regulation,

Sinking

LT1460S3-10V Output Voltage

Temperature Drift

35

30

25

20

15

10

5

250

200

150

100

50

10.006

10.004

10.002

10.000

9.998

9.996

9.994

9.992

9.990

9.988

9.986

9.984

9.982

THREE TYPICAL PARTS

125°C

25°C

–55°C

0

–5

–10

125°C

25°C

0

0.1

1

10

100

0

1

2

3

4

5

–50

0

25

50

75 100 125

–25

OUTPUT CURRENT (mA)

TEMPERATURE (°C)

1460 G49

1460 G48

1460 G47

LT1460S3-10V Supply Current

vs Input Voltage

LT1460S3-10V Line Regulation

10.010

10.005

10.000

9.995

350

300

25°C

250

25°C

–55°C

125°C

–55°C

200

150

100

50

9.990

9.985

9.980

0

14

INPUT VOLTAGE (V)

18

20

6

8

10

12

16

0

6

10 12 14 16 18 20

2

4

8

INPUT VOLTAGE (V)

1460 G51

1460 G50

1460fc

ꢀꢂ

LT1460

typical perForMance characteristics

Characteristic curves are similar for all voltage

options of the LT1460S3. Curves from the LT1460S3-2.5 and the LT1460S3-10 represent the extremes of the voltage options.

Characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output.

LT1460S3-10V Power Supply

Rejection Ratio vs Frequency

LT1460S3-10V Output Impedance

vs Frequency

LT1460S3-10V Transient

Response

100

90

80

70

60

50

40

30

20

10

0

1000

100

10

20

10

C

= 0µF

L

C

= 0.1µF

L

1

C

= 1µF

L

0.1

1

1460 G54

200µs/DIV

C

= 0µF

LOAD

0.1

1

10

100

1000

0.01

0.1

1

10

100

1000

FREQUENCY (kHz)

1460 G52

1460 G53

LT1460S3-10V Output Voltage

Noise Spectrum

LT1460S3-10V Output Noise

0.1Hz to 10Hz

10

1

0.1

0.01

0.1

1

10

100

TIME (2 SEC/DIV)

1460 G56

FREQUENCY (kHz)

1460 G55

1460fc

ꢀꢃ

LT1460

applications inForMation

Longer Battery Life

the ringing can be reduced with a small resistor in series

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

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

tosupplythemaximumcurrentthatcaneverbedemanded

by the circuit being regulated. When the circuit being

controlled is not operating at this maximum current, the

shunt reference must always sink this current, resulting

in high dissipation and short battery life.

shows the response of the LT1460-2.5 with a R = 2Ω and

S

2.5V

1.5V

V

GEN

R

= 10k

V

L

OUT

R

= 1k

The LT1460 series reference does not require a current set-

ting resistor and can operate with any supply voltage from

V

OUT

+0.9Vto20V. Whenthecircuitrybeingregulateddoes

1460 F02

1µs/DIV

notdemandcurrent, theLT1460reducesitsdissipationand

batterylifeisextended.Ifthereferenceisnotdeliveringload

current it dissipatesonly a fewmW, yetthe same configura-

tion can deliver 20mA of load current when demanded.

Figure 2. C_L= 0

2.5V

1.5V

V

GEN

Capacitive Loads

R

= 10k

The LT1460 is designed to be stable with capacitive loads.

With no capacitive load, the reference is ideal for fast set-

tling, applications where PC board space is a premium,

or where available capacitance is limited.

V

L

OUT

= 1k

1460 F03

The test circuit for the LT1460-2.5 shown in Figure 1 is

used to measure the response time for various load cur-

rents and load capacitors. The 1V step from 2.5V to 1.5V

20µs/DIV

Figure 3. C_L= 0.01µF

produces a current step of 1mA or 100µA for R = 1k or

L

V

OUT

R

L

R = 10k. Figure 2 shows the response of the reference

S

L

V

= 5V

C

LT1460-2.5

IN

V

GEN

with no load capacitance.

2.5V

1.5V

IN

C

L

0.1µF

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

for a 100µA pulse and to 0.1% in 1.5µs with a 1mA step.

When load capacitance is greater than 0.01µF, the refer-

ence begins to ring due to the pole formed with the output

impedance. Figure 3 shows the response of the reference

to a 1mA and 100µA load current step with a 0.01µF load

capacitor. The ringing can be greatly reduced with a DC

loadassmallas200µA.Withlargeoutputcapacitors,≥1µF,

1460 F04

Figure 4. Isolation Resistor Test Circuit

V

2.5V

1.5V

GEN

R

= 1k

L

S

V

OUT

= 0

R

= 1k

= 2Ω

R

L

S

V

OUT

V

= 5V

LT1460-2.5

IN

V

GEN

2.5V

1.5V

C

IN

0.1µF

C

L

1460 F05

1460 F01

0.1ms/DIV

Figure 1. Response Time Test Circuit

Figure 5. Effect of R_Sfor C_L= 1µF

1460fc

ꢀꢄ

LT1460

applications inForMation

C = 1µF. R should not be made arbitrarily large because

and 100µA load current step with a 0.01µF load capacitor.

Figure 9 to Figure 11 illustrate response of the LT1460-10.

The 1V step from 10V to 9V produces a current step of

L

S

it will limit the load regulation.

Figure 6 to Figure 8 illustrate response in the LT1460-5.

The 1V step from 5V to 4V produces a current step of

1mA or 100µA for R = 1k or R = 10k. Figure 10 shows

L

the response of the reference with no load capacitance.

1mA or 100µA for R = 1k or R = 10k. Figure 7 shows the

L

response of the reference with no load capacitance.

The reference settles to 10mV (0.1%) in 0.4µs for a 100µA

pulse and to 0.1% in 0.8µs with a 1mA step. When load

capacitance is greater than 0.01µF, the reference begins

to ring due to the pole formed with the output impedance.

Figure11showstheresponseofthereferencetoa1mAand

100µA load current step with a 0.01µF load capacitor.

The reference settles to 5mV (0.1%) in less than 2µs for

a 100µA pulse and to 0.1% in 3µs with a 1mA step. When

loadcapacitanceisgreaterthan0.01µF,thereferencebegins

to ring due to the pole formed with the output impedance.

Figure 8 shows the response of the reference to a 1mA

R

L

R

L

V

OUT

V

= 12.5V

C

LT1460-10

V

= 5V

C

LT1460-5

IN

V

GEN

IN

V

GEN

10V

9V

5V

4V

IN

C

L

0.1µF

1460 F09

1460 F06

Figure 6. Response Time Test Circuit

Figure 9. Response Time Test Circuit

5V

V

10V

9V

GEN

4V

V

R

= 10k

R

L

= 10k

OUT

L

R

= 1k

R

L

= 1k

1460 F07

1460 F10

2µs/DIV

Figure 7. C_L= 0

Figure 10. C_L= 0

10V

9V

V

5V

4V

GEN

V

GEN

OUT

V

R

L

R

L

= 10k

= 1k

R

= 10k

OUT

L

= 1k

V

L

OUT

1460 F08

1460 F11

10µs/DIV

Figure 8. C_L= 0.01µF

Figure 11. C_L= 0.01µF

1460fc

ꢀꢅ

LT1460

applications inForMation

The LT1460S3 family of references are designed to be

stable with a large range of capacitive loads. With no

capacitive load, these references are ideal for fast settling

or applications where PC board space is a premium. The

test circuit shown in Figure 12 is used to measure the

response time and stability of various load currents and

load capacitors. This circuit is set for the 2.5V option. For

other voltage options, the input voltage must be scaled

up and the output voltage generator offset voltage must

be adjusted. The 1V step from 2.5V to 1.5V produces a

1mA and 10mA load steps with no load capacitance, and

Figure 14 shows a 1mA and 10mA load step with a 0.1µF

output capacitor. Figure 15 shows the response to a 1mA

load step with C = 1µF and 4.7µF.

L

The frequency compensation of the LT1460S3 version is

slightlydifferentthanthatoftheotherpackages.Additional

care must be taken when choosing load capacitance in an

application circuit.

Table 1 gives the maximum output capacitance for vari-

ous load currents and output voltages of the LT1460S3 to

avoid instability. Load capacitors with low ESR (effective

series resistance) cause more ringing than capacitors

with higher ESR such as polarized aluminum or tantalum

capacitors.

current step of 10mA or 1mA for R = 100Ω or R = 1k.

L

Figure 13 shows the response of the reference to these

R

L

V

OUT

V

= 2.5V

LT1460S3-2.5

IN

V

GEN

2.5V

1.5V

C

IN

C

L

0.1µF

1460 F12

V

2.5V

1.5V

GEN

Figure 12. Response Time Test Circuit

V

1mA

OUT

V

2.5V

GEN

10mA

1.5V

V

1mA

OUT

1460 F14

100µs/DIV

Figure 14. C_L= 0.1µF

10mA

1460 F13

1µs/DIV

V

2.5V

1.5V

GEN

Figure 13. C_L= 0µF

V

1µA

OUT

4.7µA

1460 F15

100µs/DIV

Figure 15. I_OUT= 1mA

1460fc

ꢀꢆ

LT1460

applications inForMation

Hysteresis

Table 1. Maximum Output Capacitance for LT1460S3

VOLTAGE

HysteresisdatashowninFigure17andFigure18represents

the worst-case data taken on parts from 0°C to 70°C and

from –40°C to 85°C. The device is capable of dissipating

relativelyhighpower,i.e.,fortheLT1460S3-2.5,PD=17.5V

• 20mA = 350mW. The thermal resistance of the SOT-23

package is 325°C/W and this dissipation causes a 114°C

OPTION

2.5V

3V

I

= 100µA

I

= 1mA

I

= 10mA

I

= 20mA

OUT

>10µF

2µF

0.68µF

>10µF

1µF

2µF

0.68µF

0.1µF

3.3V

5V

1µF

10V

0.15µF

internalriseproducingajunctiontemperatureofT =25°C

J

+ 114°C = 139°C. This elevated temperature will cause

the output to shift due to thermal hysteresis. For highest

performance in precision applications, do not let the

LT1460S3’s junction temperature exceed 85°C.

Long-Term Drift

Long-termdriftcannotbeextrapolatedfromaccelerated

hightemperaturetesting.Thiserroneoustechniquegives

drift numbers that are wildly optimistic. The only way

long-term drift can be determined is to measure it over

the time interval of interest. The LT1460S3 long-term

drift data was taken on over 100 parts that were soldered

into PC boards similar to a “real world” application. The

boards were then placed into a constant temperature oven

18

WORST-CASE HYSTERESIS

ON 40 UNITS

16

14

12

10

8

70°C TO 25°C

0°C TO 25°C

with T = 30°C, their outputs were scanned regularly and

A

6

measured with an 8.5 digit DVM. Figure 16 shows typical

4

long-term drift of the LT1460S3s.

2

150

100

0

160 200 240

–240 –200 –160 –120 –80 –40

0

40 80 120

HYSTERESIS (ppm)

1460 F17

Figure 17. 0°C to 70°C Hysteresis

50

0

9

8

7

6

5

4

3

2

1

0

WORST-CASE HYSTERESIS

ON 34 UNITS

–50

–100

–150

85°C TO 25°C

–40°C TO 25°C

0

100 200 300 400 500 600 700 800 900 1000

HOURS

1460 F16

Figure 16. Typical Long-Term Drift

400 500 600

100 200 300

–600 –500 –400 –300 –200 –100

0

HYSTERESIS (ppm)

1460 F18

Figure 18. –40°C to 85°C Hysteresis

1460fc

ꢀꢇ

LT1460

applications inForMation

Input Capacitance

Total worst-case output error is:

It is recommended that a 0.1µF or larger capacitor be

added to the input pin of the LT1460. This can help with

stability when large load currents are demanded.

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

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.

Output Accuracy

Note that the LT1460-5 and LT1460-10 give identical ac-

curacy as a fraction of their respective output voltages.

Likeallreferences,eitherseriesorshunt,theerrorbudgetof

theLT1460-2.5ismadeupofprimarilythreecomponents:

initialaccuracy,temperaturecoefficientandloadregulation.

Line regulation is neglected because it typically contrib-

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

LT1460-2.5typicallyshiftslessthan0.01%whensoldered

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:

PC Board Layout

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

for instance) can shift the output voltage and mask the

true 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.

LT1460AC

Initial accuracy = 0.075%

For I = 100µA, and using the LT1460-2.5 for calculation,

O





3500ppm

mA

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,

or a region where the flexure of the board is minimum.

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 20a.

ΔV_OUT

=

0.1mA 2.5V = 875µV

(

)(

)









which is 0.035%.

For temperature 0°C to 70°C the maximum ΔT = 70°C,





10ppm

ΔV

=

70°C 2.5V = 1.75mV

(

)(

)

OUT





°C





A qualitative technique to evaluate the effect of stress on

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

which is 0.07%.

Table 2. Worst-Case Output Accuracy Over Temperature

I

LT1460AC LT1460BI LT1460CC LT1460DC LT1460EI LT1460FC LT1460GC LT1460GI LT1460HC LT1460JC LT1460KC

OUT

0

0.145%

0.180%

0.325%

0.425%

0.225%

0.260%

0.405%

N/A

0.205%

0.240%

0.385%

0.485%

0.240%

0.275%

0.420%

0.520%

0.375%

0.410%

0.555%

N/A

0.325%

0.360%

0.505%

0.605%

0.425%

0.460%

0.605%

0.705%

0.562%

0.597%

0.742%

N/A

0.340%

0.380%

0.640%

0.540%

0.580%

0.840%

0.740%

0.850%

0.890%

1.15%

1.05%

100µA

10mA

20mA

1460fc

ꢀꢈ

LT1460

applications inForMation

deform the board a fixed amount as shown in Figure 19.

The flexure #1 represents no displacement, flexure #2 is

concavemovement,flexure#3isrelaxationtonodisplace-

ment 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 20a

is for two LT1460S8-2.5s mounted vertically and Figure

20b is for two LT1460S8-2.5s mounted horizontally. The

parts oriented in Figure 20a impart less stress into the

package because stress is absorbed in the leads. Figures

20a and 20b show the deviation to be between 125µV and

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

tively. This corresponds to a 13- to 14-bit system and is

not a problem for most 10- to 12-bit systems unless the

system has a calibration. In this case, as with temperature

hysteresis, this low level can be important and even more

careful techniques are required.

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

thereferenceandtheleadscanexitonthefourthside. This

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

direction of the board to further reduce stress transferred

to the reference.

1

2

3

The results of slotting the PC boards of Figures 20a and

20b are shown in Figures 21a and 21b. In this example

the slots can improve the output shift from about 100ppm

to nearly zero.

4

1460 F19

Figure 19. Flexure Numbers

2

1

LONG DIMENSION

0

–1

0

40

10

20

FLEXURE NUMBER

30

10

20

FLEXURE NUMBER

30

1460 F20a

1460 F20b

Figure 20a. Two Typical LT1460S8-2.5s, Vertical

Orientation Without Slots

Figure 20b. Two Typical LT1460S8-2.5s, Horizontal

Orientation Without Slots

2

1

2

1

0

SLOT

–1

0

40

10

20

30

10

20

30

FLEXURE NUMBER

1460 F21a

1460 F21b

Figure 21a. Same Two LT1460S8-2.5s in Figure 16a,

but with Slots

Figure 21b. Same Two LT1460S8-2.5s in Figure 16b,

but with Slots

1460fc

ꢁ0

LT1460

siMpliFieD scheMatic

V

CC

V

OUT

GND

1460 SS

package Description

S3 Package

3-Lead Plastic SOT-23

(Reference LTC DWG # 05-08-1631)

0.764

2.80 – 3.04

(.110 – .120)

0.8 ±0.127

2.10 – 2.64

1.20 – 1.40

2.74

(.083 – .104) (.047 – .060)

0.96 BSC

1.92

0.45 – 0.60

(.017 – .024)

RECOMMENDED SOLDER PAD LAYOUT

0.89 – 1.03

(.035 – .041)

0.37 – 0.51

(.015 – .020)

0.89 – 1.12

(.035 – .044)

0.01 – 0.10

(.0004 – .004)

0.55

(.022)

REF

1.78 – 2.05

(.070 – .081)

0.09 – 0.18

(.004 – .007)

S3 SOT-23 0502

NOTE:

1. CONTROLLING DIMENSION: MILLIMETERS

MILLIMETERS

2. DIMENSIONS ARE IN

(INCHES)

3. DRAWING NOT TO SCALE

4. DIMENSIONS ARE INCLUSIVE OF PLATING

5. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR

6. MOLD FLASH SHALL NOT EXCEED .254mm

7. PACKAGE JEDEC REFERENCE IS TO-236 VARIATION AB

1460fc

LT1460

package Description

N8 Package

8-Lead PDIP (Narrow .300 Inch)

(Reference LTC DWG # 05-08-1510)

.400*

(10.160)

MAX

8

7

6

5

4

.255 ± .015*

(6.477 ± 0.381)

1

2

3

.130 ± .005

.300 – .325

.045 – .065

(3.302 ± 0.127)

(1.143 – 1.651)

(7.620 – 8.255)

.065

(1.651)

TYP

.008 – .015

(0.203 – 0.381)

.120

.020

(0.508)

MIN

(3.048)

MIN

+.035

.325

–.015

.018 ± .003

(0.457 ± 0.076)

.100

(2.54)

BSC

+0.889

8.255

(

)

N8 1002

–0.381

NOTE:

INCHES

1. DIMENSIONS ARE

MILLIMETERS

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)

S8 Package

8-Lead Plastic Small Outline (Narrow .150 Inch)

(Reference LTC DWG # 05-08-1610)

.189 – .197

(4.801 – 5.004)

.045 ±.005

NOTE 3

.050 BSC

7

5

8

6

.245

MIN

.160 ±.005

.150 – .157

(3.810 – 3.988)

NOTE 3

.228 – .244

(5.791 – 6.197)

.030 ±.005

TYP

1

3

4

2

RECOMMENDED SOLDER PAD LAYOUT

.010 – .020

(0.254 – 0.508)

× 45°

.053 – .069

(1.346 – 1.752)

.004 – .010

(0.101 – 0.254)

.008 – .010

(0.203 – 0.254)

0°– 8° TYP

.016 – .050

(0.406 – 1.270)

.050

(1.270)

BSC

.014 – .019

(0.355 – 0.483)

TYP

NOTE:

INCHES

1. DIMENSIONS IN

(MILLIMETERS)

2. DRAWING NOT TO SCALE

3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)

SO8 0303

1460fc

ꢀꢀ

LT1460

package Description

MS8 Package

8-Lead Plastic MSOP

(Reference LTC DWG # 05-08-1660 Rev F)

0.889 ± 0.127

(.035 ± .005)

5.23

(.206)

MIN

3.20 – 3.45

(.126 – .136)

3.00 ± 0.102

(.118 ± .004)

(NOTE 3)

0.52

(.0205)

REF

0.65

(.0256)

BSC

0.42 ± 0.038

(.0165 ± .0015)

TYP

8

7 6 5

RECOMMENDED SOLDER PAD LAYOUT

3.00 ± 0.102

(.118 ± .004)

(NOTE 4)

4.90 ± 0.152

(.193 ± .006)

DETAIL “A”

0.254

(.010)

0° – 6° TYP

GAUGE PLANE

1

2

3

4

0.53 ± 0.152

(.021 ± .006)

1.10

(.043)

MAX

0.86

(.034)

REF

DETAIL “A”

0.18

(.007)

SEATING

PLANE

0.22 – 0.38

0.1016 ± 0.0508

(.009 – .015)

(.004 ± .002)

0.65

(.0256)

BSC

TYP

MSOP (MS8) 0307 REV F

NOTE:

1. DIMENSIONS IN MILLIMETER/(INCH)

2. DRAWING NOT TO SCALE

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

MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE

4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.

INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE

5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX

1460fc

ꢀꢁ

LT1460

package Description

Z Package

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

(Reference LTC DWG # 05-08-1410 Rev C)

.060 p .005

.180 p .005

(4.572 p 0.127)

(1.524p 0.127)

DIA

.90

(2.286)

NOM

.180 p .005

(4.572 p 0.127)

5o

NOM

.500

(12.70)

MIN

.050

(1.270)

MAX

UNCONTROLLED

LEAD DIMENSION

.016 p .003

(0.406 p 0.076)

.015 p .002

(0.381 p 0.051)

Z3 (TO-92) 1008 REV C

.050

.098 +.016/–.04

(2.5 +0.4/–0.1)

2 PLCS

(1.27)

BSC

BULK PACK

TO-92 TAPE AND REEL

REFER TO TAPE AND REEL SECTION OF

LTC DATA BOOK FOR ADDITIONAL INFORMATION

.060 p .010

(1.524 p 0.254)

.140 p .010

(3.556 p 0.127)

3

2

1

10o NOM

1460fc

ꢀꢂ

LT1460

revision history ^{(Revision history begins at Rev C)}

REV

DATE

DESCRIPTION

PAGE NUMBER

C

3/10

2

Change θ on S3 Package from 325°C/W to 228°C/W

JA

1460fc

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.

ꢀꢃ

LT1460

typical applications

Handling Higher Load Currents

+

V

40mA

+

47µF

IN

R1*

LT1460

10mA

V

OUT

GND

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

+

V

– V

OUT

R1 =

40mA

1460 TA03

Boosted Output Current with No Current Limit

Boosted Output Current with Current Limit

+

V

≥ (V

+ 1.8V)

V

≥ V

+ 2.8V

OUT

+

D1*

LED

R1

220Ω

R1

220Ω

47µF

8.2Ω

2N2905

IN

LT1460

V

OUT

V

OUT

100mA

OUT

100mA

+

2µF

SOLID

TANT

GND

+

2µF

GND

SOLID

TANT

GLOWS IN CURRENT LIMIT,

DO NOT OMIT

*

1460 TA05

1460 TA04

relateD parts

PART NUMBER DESCRIPTION

COMMENTS

LT1019

LT1027

LT1236

LT1461

LT1634

LT1790

LTC^®1798

LTC6652

LT6660

Precision Bandgap Reference

Precision 5V Reference

0.05% Max, 5ppm/°C Max

0.02%, 2ppm/°C Max

Precision Low Noise Reference

0.05% Max, 5ppm/°C Max, SO Package

Micropower Precision Low Dropout

0.04% Max, 3ppm/°C Max, 50mA Output Current

0.05%, 25ppm/°C Max

Micropower Precision Shunt Reference 1.25V, 2.5V Output

Micropower Precision Series References

0.05% Max, 10ppm/°C Max, 60µA Supply, SOT23 Package

0.15% Max, 40ppm/°C, 6.5µA Max Supply Current

Micropower Low Dropout Reference, Fixed or Adjustable

Low Drift Low Noise Buffered Reference

0.05% Accuracy, 5ppm/°C Drift, 2.1ppm (0.1Hz to 10Hz) Noise

Tiny Micropower Precision Series References

0.075% Max, 10ppm/°C Max, 20mA Output, 2mm × 2mm DFN Package

1460fc

LT 0310 REV C • PRINTED IN USA

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

ꢀꢄ

●

 LINEAR TECHNOLOGY CORPORATION 2006

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


型号：	LT1460MHS8-5-PBF
厂家：	Linear
描述：	Micropower Precision Series Reference Family 微功率精准串联基准系列
文件：	总26页 (文件大小：1111K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LT1460MHS8-5-PBF [Linear]

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