Linear Technology LT1460S3 Datasheet

1

LT1460S3 (SOT-23)

Family of Micropower

Series References

in SOT-23

■

3-Lead SOT-23 Package

■

Low Drift: 20ppm/°C Max

■

High Accuracy: 0.2% Max

■

Low Supply Current

■

20mA Output Current Guaranteed

■

No Output Capacitor Required

■

Reverse-Battery Protection

■

Low PC Board Solder Stress: 0.02% Typ

■

Voltage Options: 2.5V, 3V, 3.3V, 5V and 10V

■

The LT1460 is Also Available in SO-8, 8-Lead MSOP,
8-Lead PDIP and TO-92 Packages.

■

Operating Temperature Range: –40°C to 85°C

The LT®1460S3 is a family of SOT-23 micropower series
references that combine high accuracy and low drift with low
power dissipation and small package size. These series
references use curvature compensation to obtain low tem­perature coefficient, and laser trimmed precision thin-film
resistors to achieve high output accuracy. Furthermore,
output shift due to PC board soldering stress has been
dramatically reduced. These references will supply up to
20mA, making them ideal for precision regulator applica­tions, yet they are almost totally immune to input voltage
variations.

These series references provide supply current and power
dissipation advantages over shunt references that must idle
the entire load current to operate. Additionally, the
LT1460S3 does not require an output compensation capaci­tor. This feature is important in applications where PC board
space is a premium or fast settling is demanded. Reverse­battery protection keeps these references from conducting
reverse current.

■

Handheld Instruments

■

Precision Regulators

■

A/D and D/A Converters

■

Power Supplies

■

Hard Disk Drives

Basic Connection

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

Typical Distribution of SOT-23 LT1460HC

V

OUT

After

IR Reflow Solder

FEATURES

DESCRIPTIO

U

APPLICATIO S

U

TYPICAL APPLICATIO

U

LT1460S3

GND

IN OUT

V

OUT

+ 0.9V ≤ VIN ≤ 20V

1460S3 TA01

C1

0.1µF

V

OUT

OUTPUT VOLTAGE ERROR (%)

–0.3

DISTRIBUTION (%)

12

16

20

0

0.2

1460S3 TA02

8

4

0

–0.2 –0.1 0.1

24

28

32

0.3

LT1460HC LIMITS

2

LT1460S3 (SOT-23)

ABSOLUTE MAXIMUM RATINGS

W

WW

U

PACKAGE/ORDER INFORMATION

W

U

U

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

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

Output Short-Circuit Duration, TA = 25°C .............. 5 sec

Specified Temperature Range..................... 0°C to 70°C

ORDER PART

NUMBER

S3

PART MARKING

Consult factory for Industrial and Military grade parts.

T

JMAX

= 125°C, θJA = 325°C/W

3 GND

IN 1

TOP VIEW

S3 PACKAGE

3-LEAD PLASTIC SOT-23

OUT 2

LTAC
LTAD
LTAE
LTAN
LTAP
LTAQ
LTAR
LTAS
LTAT
LTAK
LTAL
LTAM
LTAU
LTAV
LTAW

Operating Temperature Range

(Note 2) ............................................. – 40°C to 85°C

Storage Temperature Range (Note 3) ... –65°C to 150°C

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

(Note 1)

LT1460HCS3-2.5
LT1460JCS3-2.5
LT1460KCS3-2.5
LT1460HCS3-3
LT1460JCS3-3
LT1460KCS3-3
LT1460HCS3-3.3
LT1460JCS3-3.3
LT1460KCS3-3.3
LT1460HCS3-5
LT1460JCS3-5
LT1460KCS3-5
LT1460HCS3-10
LT1460JCS3-10
LT1460KCS3-10

AVAILABLE OPTIO S

U

OUTPUT VOLTAGE SPECIFIED TEMPERATURE ACCURACY TEMPERATURE PART ORDER

(V) RANGE (%) COEFFICIENT (ppm/°C) NUMBER

2.5 0°C to 70°C 0.2 20 LT1460HCS3-2.5

2.5 0°C to 70°C 0.4 20 LT1460JCS3-2.5

2.5 0°C to 70°C 0.5 50 LT1460KCS3-2.5
30°C to 70°C 0.2 20 LT1460HCS3-3

30°C to 70°C 0.4 20 LT1460JCS3-3
30°C to 70°C 0.5 50 LT1460KCS3-3

3.3 0°C to 70°C 0.2 20 LT1460HCS3-3.3

3.3 0°C to 70°C 0.4 20 LT1460JCS3-3.3

3.3 0°C to 70°C 0.5 50 LT1460KCS3-3.3
50°C to 70°C 0.2 20 LT1460HCS3-5

50°C to 70°C 0.4 20 LT1460JCS3-5
50°C to 70°C 0.5 50 LT1460KCS3-5

10 0°C to 70°C 0.2 20 LT1460HCS3-10
10 0°C to 70°C 0.4 20 LT1460JCS3-10
10 0°C to 70°C 0.5 50 LT1460KCS3-10

3

LT1460S3 (SOT-23)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Output Voltage Tolerance (Note 4) LT1460HCS3 –0.2 0.2 %

LT1460JCS3 – 0.4 0.4 %
LT1460KCS3 – 0.5 0.5 %

Output Voltage Temperature Coefficient (Note 5) LT1460HCS3 ● 10 20 ppm/°C

LT1460JCS3

● 10 20 ppm/°C

LT1460KCS3

● 25 50 ppm/°C

Line Regulation V

OUT

+ 0.9V ≤ VIN ≤ V

OUT

+ 2.5V 150 800 ppm/V

● 1000 ppm/V

V

OUT

+ 2.5V ≤ VIN ≤ 20V 50 100 ppm/V

● 130 ppm/V

Load Regulation Sourcing (Note 6) I

OUT

= 100µA 1000 3000 ppm/mA

● 4000 ppm/mA

I

OUT

= 10mA 50 200 ppm/mA

● 300 ppm/mA

I

OUT

= 20mA 20 70 ppm/mA

● 100 ppm/mA

Thermal Regulation (Note 7) ∆P = 200mW 2.5 10 ppm/mW
Dropout Voltage (Note 8) VIN – V

OUT, ∆VOUT

≤ 0.2%, I

OUT

= 0 ● 0.9 V

VIN – V

OUT

, ∆V

OUT

≤ 0.2%, I

OUT

= 10mA 1.3 V

● 1.4 V

Output Current Short V

OUT

to GND 40 mA

Reverse Leakage VIN = –15V ● 0.5 10 µA
Output Voltage Noise (Note 9) 0.1Hz ≤ f ≤ 10Hz 4 ppm (P-P)

10Hz ≤ f ≤ 1kHz 4 ppm (RMS)
Long-Term Stability of Output Voltage (Note 10) 100 ppm/√kHr
Hysteresis (Note 11) ∆T = 0°C to 70°C ● 50 ppm

∆T = –40°C to 85°C

● 250 ppm

Supply Current LT1460S3-2.5 115 145 µA

● 175 µA

LT1460S3-3 145 180 µA

● 220 µA

LT1460S3-3.3 145 180 µA

● 220 µA

LT1460S3-5 160 200 µA

● 240 µA

LT1460S3-10 215 270 µA

● 350 µA

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full specified

temperature range, otherwise specifications are at TA = 25°C. VIN = V

OUT

+ 2.5V, I

OUT

= 0 unless otherwise specified.

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

of a device may be impaired.
Note 2: The LT1460S3 is guaranteed functional over the operating

temperature range of –40°C to 85°C.
Note 3: If the parts are stored outside of the specified temperature range,

the output may shift due to hysteresis.

Note 4: ESD (Electrostatic Discharge) sensitive devices. Extensive use of
ESD protection devices are used internal to the LT1460S3, however, high
electrostatic discharge can damage or degrade the device. Use proper ESD
handling precautions.

Note 5: Temperature coefficient is measured by dividing the change in
output voltage by the specified temperature range. Incremental slope is
also measured at 25°C.

4

LT1460S3 (SOT-23)

TYPICAL PERFORMANCE CHARACTERISTICS

UW

2.5V Minimum Input-Output
Voltage Differential 2.5V Load Regulation, Sourcing 2.5V Load Regulation, Sinking

ELECTRICAL CHARACTERISTICS

Note 6: 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 7: 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 8: Excludes load regulation errors.
Note 9: Peak-to-peak noise is measured with a single pole 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 pole 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.

Note 10: 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. Long-term stability will also be affected by
differential stresses between the IC and the board material created during
board assembly.

Note 11: 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 70°C or 0°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. See
Applications Information.

Characteristic curves are similar for most
LT1460S3s. Curves from the LT1460S3-2.5 and the LT1460-10 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.

INPUT-OUTPUT VOLTAGE (V)

0

0.1

OUTPUT CURRENT (mA)

10

125°C

25°C

100

0.5 1.0 1.5 2.0 2.5

1460S3 G01

1

–55°C

OUTPUT CURRENT (mA)

0.1

–2.0

OUTPUT VOLTAGE CHANGE (mV)

–1.0

0

1 10 100

1460s3 G02

–3.0

–2.5

–1.5

–0.5

–3.5

–4.0

–55°C

25°C

125°C

OUTPUT CURRENT (mA)

0

0

OUTPUT VOLTAGE CHANGE (mV)

20

40

60

80

100

120

1234

–55°C

1460S3 G03

5

125°C

25°C