LT1460-10
Micropower Precision
Series Reference
FEATURES
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DESCRIPTION
The LT
®
1460-10 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 a low temperature
coefficient and trimmed precision thin-film resistors to
achieve high output accuracy. The reference will supply up to
20mA, making it ideal for precision regulator applications, yet
it is almost totally immune to input voltage variations.
This series reference provides supply current and power
dissipation advantages over shunt references that must idle
the entire load current to operate. Additionally, the LT1460-10
does not require an output capacitor, but it is stable with
capacitive loads. This feature is important in critical applica-
tions where PC board space is a premium or fast settling is
demanded. Reverse battery protection keeps the reference
from conducting current and being damaged.
The LT1460-10 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 LT1460S3-10
(SOT-23).
, LTC and LT are registered trademarks of Linear Technology Corporation.
High Accuracy: 0.075% Max
Low Drift: 10ppm/
°
C Max
Industrial Temperature Range SO-8 Package
Low Supply Current: 270µA Max
Minimum Output Current: 20mA
No Output Capacitor Required
Reverse Battery Protection
Minimum Input/Output Differential: 0.9V
Available in Small MSOP Package
APPLICATIONS
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Handheld Instruments
Precision Regulators
A/D and D/A Converters
Power Supplies
Hard Disk Drives
TYPICAL APPLICATION
Typical Distribution of Output Voltage
S8 Package
20
18
16
14
1400 PARTS
FROM 2 RUNS
Basic Connection
10.9V
TO 20V
C1
0.1µF
LT1460-10
UNITS (%)
IN
GND
OUT
10V
12
10
8
6
4
2
0
– 0.10
– 0.06 – 0.02 0 0.02
0.06
OUTPUT VOLTAGE ERROR (%)
0.10
1460-10 TA01
U
U
U
1460-10 TA02
1
LT1460-10
ABSOLUTE
MAXIMUM
RATINGS
Input Voltage ........................................................... 30V
Reverse Voltage .................................................... – 15V
Output Short-Circuit Duration, T
A
= 25°C ............. 5 sec
Specified Temperature Range
Commercial ............................................ 0°C to 70°C
Industrial ........................................... – 40°C to 85°C
Storage Temperature Range (Note 1) ... – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
NC*
V
IN
NC*
GND
1
2
3
4
8
7
6
5
NC*
NC*
V
OUT
NC*
TOP VIEW
NC* 1
V
IN
2
NC* 3
GND 4
N8 PACKAGE
8-LEAD PDIP
8
7
6
5
NC*
NC*
V
OUT
NC*
*CONNECTED INTERNALLY.
DO NOT CONNECT
EXTERNAL CIRCUITRY
TO THESE PINS
MS8 PACKAGE
8-LEAD PLASTIC MSOP
*CONNECTED INTERNALLY.
DO NOT CONNECT EXTERNAL
CIRCUITRY TO THESE PINS
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 130°C/ W (N8)
T
JMAX
= 150°C,
θ
JA
= 190°C/ W (S8)
T
JMAX
= 150°C,
θ
JA
= 250°C/ W
ORDER PART NUMBER
LT1460CCMS8-10
LT1460FCMS8-10
ORDER PART NUMBER
LT1460ACN8-10
LT1460BIN8-10
LT1460DCN8-10
LT1460EIN8-10
LT1460ACS8-10
LT1460BIS8-10
LT1460DCS8-10
LT1460EIS8-10
MS8 PART MARKING
LTAH
LTAJ
Consult factory for Military grade parts.
S8 PART MARKING
1460A1
460BI1
1460D1
460EI1
Available Options
ACCURACY
(%)
0.075
0.10
0.10
0.10
0.125
0.15
0.25
0.25
TEMPERATURE
COEFFICIENT
(ppm/
°
C)
10
10
15
20
20
25
25
25
LT1460DCN8-10
LT1460EIN8-10
LT1460DCS8-10
LT1460EIS8-10
LT1460FCMS8-10
LT1460GCZ-10
LT1460GIZ-10
PACKAGE TYPE
N8
LT1460ACN8-10
LT1460BIN8-10
S8
LT1460ACS8-10
LT1460BIS8-10
LT1460CCMS8-10
MS8
Z
TEMPERATURE
0°C to 70°C
– 40°C to 85°C
0°C to 70°C
0°C to 70°C
– 40°C to 85°C
0°C to 70°C
0°C to 70°C
– 40°C to 85°C
2
U
U
W
W W
U
W
BOTTOM VIEW
3
V
IN
2
V
OUT
1
GND
Z PACKAGE
3-LEAD TO-92 PLASTIC
T
JMAX
= 150°C,
θ
JA
= 160°C/ W
ORDER PART NUMBER
LT1460GCZ-10
LT1460GIZ-10
LT1460-10
ELECTRICAL CHARACTERISTICS
PARAMETER
Output Voltage (Note 2)
V
IN
= 12.5V, I
OUT
= 0, T
A
= 25°C unless otherwise specified.
MIN
9.9925
– 0.075
9.990
– 0.10
9.9875
– 0.125
9.985
– 0.15
9.975
– 0.25
q
q
q
q
q
CONDITIONS
LT1460ACN8, ACS8
LT1460BIN8, BIS8, CCMS8, DCN8, DCS8
LT1460EIN8, EIS8
LT1460FCMS8
LT1460GCZ, GIZ
TYP
10.000
10.000
10.000
10.000
10.000
MAX
10.0075
0.075
10.010
0.10
10.0125
0.125
10.015
0.15
10.025
0.25
10
15
20
25
60
80
25
35
2800
3500
135
180
100
140
2.5
0.9
1.3
1.4
UNITS
V
%
V
%
V
%
V
%
V
%
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ppm/V
ppm/V
ppm/V
ppm/V
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mW
V
V
V
mA
µA
µA
µA
µV
P-P
µV
RMS
ppm/√kHr
ppm
ppm
Output Voltage Temperature Coefficient (Note 3)
T
MIN
≤
T
J
≤
T
MAX
LT1460ACN8, ACS8, BIN8, BIS8
LT1460CCMS8
LT1460DCN8, DCS8, EIN8, EIS8
LT1460FCMS8, GCZ, GIZ
10.9V
≤
V
IN
≤
12.5V
12.5V
≤
V
IN
≤
20V
5
7
10
12
30
10
Line Regulation
q
Load Regulation Sourcing (Note 4)
I
OUT
= 100µA
q
1500
80
q
I
OUT
= 10mA
I
OUT
= 20mA
0°C to 70°C
Thermal Regulation (Note 5)
Dropout Voltage (Note 6)
∆P
= 200mW
V
IN
– V
OUT
,
∆V
OUT
≤
0.1%, I
OUT
= 0
V
IN
– V
OUT
,
∆V
OUT
≤
0.1%, I
OUT
= 10mA
q
q
70
q
0.5
Output Current
Reverse Leakage
Supply Current
Short V
OUT
to GND
V
IN
= – 15V
q
q
40
0.5
190
10
270
360
Output Voltage Noise (Note 7)
Long-Term Stability of Output Voltage, S8 Pkg (Note 8)
Hysteresis (Note 9)
0.1Hz
≤
f
≤
10Hz
10Hz
≤
f
≤
1kHz
∆T
= – 40°C to 85°C
∆T
= 0°C to 70°C
40
35
40
160
25
The
q
denotes specifications which apply over the specified temperature
range.
Note 1:
If the part is stored outside of the specified temperature range, the
output may shift due to hysteresis.
Note 2:
ESD (Electrostatic Discharge) sensitive device. Extensive use of
ESD protection devices are used internal to the LT1460-10, however, high
electrostatic discharge can damage or degrade the device. Use proper ESD
handling precautions.
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.
3
LT1460-10
ELECTRICAL CHARACTERISTICS
Note 6:
Excludes load regulation errors.
Note 7:
Peak-to-peak noise is measured with a single highpass filter at
0.1Hz and a 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
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 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. Hysteresis
is not normally a problem for operational temperature excursions where
the instrument might be stored at high or low temperature.
TYPICAL PERFORMANCE CHARACTERISTICS
Minimum Input/Output
Voltage Differential
100
10
9
OUTPUT VOLTAGE CHANGE (mV)
OUTPUT VOLTAGE CHANGE (mV)
OUTPUT CURRENT (mA)
10
1
125°C
– 55°C
25°C
0.1
0
0.5
1.0
1.5
2.0
INPUT/OUTPUT VOLTAGE (V)
2.5
Output Voltage Temperature Drift
10.006
10.002
3 TYPICAL PARTS
400
360
320
SUPPLY CURRENT (µA)
OUTPUT VOLTAGE (V)
9.998
9.994
9.990
9.986
9.982
– 50
280
240
200
160
120
80
40
OUTPUT VOLTAGE (V)
–25
0
25
50
TEMPERATURE (°C)
4
U W
1460-10 G01
Load Regulation, Sourcing
100
90
80
70
60
50
40
30
20
10
0
Load Regulation, Sinking
8
7
6
5
4
3
2
1
0
0.1
– 55°C
125°C
25°C
25°C
– 55°C
125°C
1
10
OUTPUT CURRENT (mA)
100
1460-10 G02
0
1
3
4
2
OUTPUT CURRENT (mA)
5
1460-10 G03
Supply Current vs Input Voltage
10.004
10.000
– 55°C
25°C
125°C
Line Regulation
25°C
9.996
9.992
9.988
9.984
9.980
– 55°C
125°C
75
100
0
0
2
4
6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
1460-10 G05
6
8
14
16
10
12
INPUT VOLTAGE (V)
18
20
1460-10 G04
1460-10 G06
LT1460-10
TYPICAL PERFORMANCE CHARACTERISTICS
Power Supply Rejection Ratio
vs Frequency
100
1000
POWER SUPPLY REJECTION RATIO (dB)
90
80
OUTPUT IMPEDANCE (Ω)
100
C
L
= 0.1µF
10
C
L
= 1µF
1
LOAD CAPACITANCE (µF)
70
60
50
40
30
20
10
0
0.1
1
10
100
INPUT FREQUENCY (kHz)
1000
1460-10 G07
Output Voltage Noise Spectrum
10
1
0.1
0.01
0.1
1
10
FREQUENCY (kHz)
100
1460-10 G10
OUTPUT NOISE (50µV/DIV)
NOISE VOLTAGE (µV/√Hz)
APPLICATIONS INFORMATION
Precision Regulator
The LT1460-10 is ideal as a precision regulator, and since
it operates in series mode it does not require a current
setting resistor. The reference can supply up to 20mA of
load current with good transient response. Load regula-
tion at 20mA output is typically 70ppm/mA meaning the
output changes only 14mV.
Capacitive Loads
The LT1460-10 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 10V to 9V produces a
U
W
U W
Output Impedance vs Frequency
C
L
= 0µF
Transient Responses
10
1
0.1
0
I
OUT
= 10mA
200µs/DIV
1460-10 G09
0.1
0.01
0.1
1
10
FREQUENCY (kHz)
100
1000
1460-10 G08
Output Noise 0.1Hz to 10Hz
0
2
4
6
8
10
TIME (SEC)
12
14
1460-10 G11
U
U
5
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