LT1460-2.5
Micropower Precision
Series Reference
FEATURES
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Trimmed to High Accuracy: 0.075% Max
Low Drift: 10ppm/
°
C Max
Industrial Temperature Range SO Package
Temperature Coefficient Guaranteed to 125
°
C
Low Supply Current: 130µA Max
Minimum Output Current: 20mA
No Output Capacitor Required
Reverse Battery Protection
Minimum Input/Output Differential: 0.9V
Available in Small MSOP Package
APPLICATIO S
s
s
s
s
s
Handheld Instruments
Precision Regulators
A/D and D/A Converters
Power Supplies
Hard Disk Drives
, LTC and LT are registered trademarks of Linear Technology Corporation.
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
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-
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.
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).
TYPICAL APPLICATIO
Basic Connection
LT1460-2.5
IN
C1
0.1µF
GND
1460-2.5 TA01
Typical Distribution of Output Voltage
S8 Package
20
18
1400 PARTS
FROM 2 RUNS
3.4V
TO 20V
OUT
2.5V
16
14
UNITS (%)
12
10
8
6
4
2
0
–0.10
–0.06 –0.02 0 0.02
0.06
OUTPUT VOLTAGE ERROR (%)
0.10
U
1460-2.5 TA02
U
U
1
LT1460-2.5
ABSOLUTE
MAXIMUM
RATINGS
Input Voltage ........................................................... 30V
Reverse Voltage .................................................... – 15V
Output Short-Circuit Duration, T
A
= 25°C
V
IN
> 10V ........................................................... 5 sec
V
IN
≤
10V ................................................... Indefinite
PACKAGE/ORDER INFORMATION
TOP VIEW
DNC*
V
IN
DNC*
GND
1
2
3
4
8
7
6
5
DNC*
DNC*
V
OUT
DNC*
DNC* 1
V
IN
2
DNC* 3
GND 4
N8 PACKAGE
8-LEAD PDIP
TOP VIEW
8
7
6
5
DNC*
DNC*
V
OUT
DNC*
*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
T
JMAX
= 125°C,
θ
JA
= 250°C/ W
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 125°C,
θ
JA
= 130°C/ W (N8)
T
JMAX
= 125°C,
θ
JA
= 190°C/ W (S8)
ORDER PART NUMBER
LT1460CCMS8-2.5
LT1460FCMS8-2.5
MS8 PART MARKING
LTAA
LTAB
Consult factory for Military grade parts.
ORDER PART NUMBER
LT1460ACN8-2.5
LT1460BIN8-2.5
LT1460DCN8-2.5
LT1460EIN8-2.5
LT1460ACS8-2.5
LT1460BIS8-2.5
LT1460DCS8-2.5
LT1460EIS8-2.5
S8 PART MARKING
1460A2
460BI2
1460D2
460EI2
460LH2
460MH2
LT1460LHS8-2.5
LT1460MHS8-2.5
Available Options
ACCURACY
(%)
0.075
0.10
0.10
0.10
0.125
0.15
0.25
0.25
0.20
0.20
TEMPERATURE
COEFFICIENT
(ppm/
°
C)
10
10
15
20
20
25
25
25
20/50
50
LT1460LHS8-2.5
LT1460MHS8-2.5
LT1460DCN8-2.5
LT1460EIN8-2.5
LT1460DCS8-2.5
LT1460EIS8-2.5
LT1460FCMS8-2.5
LT1460GCZ-2.5
LT1460GIZ-2.5
PACKAGE TYPE
N8
LT1460ACN8-2.5
LT1460BIN8-2.5
S8
LT1460ACS8-2.5
LT1460BIS8-2.5
LT1460CCMS8-2.5
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
– 40°C to 85°C/125°C
– 40°C to 125°C
2
U
U
W
W W
U
W
(Note 1)
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
BOTTOM VIEW
3
V
IN
2
V
OUT
1
GND
Z PACKAGE
3-LEAD TO-92 PLASTIC
T
JMAX
= 125°C,
θ
JA
= 160°C/ W
ORDER PART NUMBER
LT1460GCZ-2.5
LT1460GIZ-2.5
LT1460-2.5
ELECTRICAL CHARACTERISTICS
PARAMETER
Output Voltage (Note 3)
V
IN
= 5V, I
OUT
= 0, T
A
= 25°C unless otherwise specified.
MIN
2.49813
– 0.075
2.4975
– 0.10
2.49688
– 0.125
2.49625
– 0.15
2.49375
– 0.25
2.495
– 0.20
q
q
q
q
q
q
q
q
CONDITIONS
LT1460ACN8, ACS8
LT1460BIN8, BIS8, CCMS8, DCN8, DCS8
LT1460EIN8, EIS8
LT1460FCMS8
LT1460GCZ, GIZ
LT1460LHS8, MHS8
TYP
2.500
2.500
2.500
2.500
2.500
2.500
MAX
2.50188
0.075
2.5025
0.10
2.50313
0.125
2.50375
0.15
2.50625
0.25
2.505
0.20
10
15
20
25
20
50
50
60
80
25
35
2800
3500
135
180
100
140
2.5
0.9
1.3
1.4
UNITS
V
%
V
%
V
%
V
%
V
%
V
%
ppm/°C
ppm/°C
ppm/°C
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 4)
T
MIN
≤
T
J
≤
T
MAX
LT1460ACN8, ACS8, BIN8, BIS8
LT1460CCMS8
LT1460DCN8, DCS8, EIN8, EIS8
LT1460FCMS8, GCZ, GIZ
LT1460LHS8
– 40°C to 85°C
– 40°C to 125°C
LT1460MHS8
– 40°C to 125°C
3.4V
≤
V
IN
≤
5V
5V
≤
V
IN
≤
20V
5
7
10
12
10
25
25
30
10
Line Regulation
q
Load Regulation Sourcing (Note 5)
I
OUT
= 100µA
q
1500
80
q
I
OUT
= 10mA
I
OUT
= 20mA
0°C to 70°C
Thermal Regulation (Note 6)
Dropout Voltage (Note 7)
∆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
100
10
130
165
Output Voltage Noise (Note 8)
Long-Term Stability of Output Voltage, S8 Pkg (Note 9)
Hysteresis (Note 10)
0.1Hz
≤
f
≤
10Hz
10Hz
≤
f
≤
1kHz
∆T
= – 40°C to 85°C
∆T
= 0°C to 70°C
10
10
40
160
25
3
LT1460-2.5
ELECTRICAL CHARACTERISTICS
The
q
denotes specifications which apply over the specified temperature
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 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
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 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.
TYPICAL PERFORMANCE CHARACTERISTICS
Minimum Input-Output Voltage
Differential
100
OUTPUT VOLTAGE CHANGE (mV)
6
OUTPUT VOLTAGE CHANGE (mV)
OUTPUT CURRENT (mA)
10
–55°C
1
125°C
25°C
0.1
0
0.5
1.0
1.5
2.0
INPUT-OUTPUT VOLTAGE (V)
2.5
4
U W
Load Regulation, Sourcing
80
70
Load Regulation, Sinking
5
125°C
4
3
25°C
2
–55°C
1
0
125°C
60
50
25°C
40
30
20
–55°C
10
0.1
1
10
OUTPUT CURRENT (mA)
100
1460-2.5 G02
0
0
1.0
0.5
OUTPUT CURRENT (mA)
1.5
1460-2.5 G03
1460-2.5 G01
LT1460-2.5
TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage Temperature Drift
2.503
3 TYPICAL PARTS
150
2.502
SUPPLY CURRENT (µA)
OUTPUT VOLTAGE (V)
125
100
75
50
25
2.498
–50
0
–25
0
25
50
TEMPERATURE (°C)
75
100
0
5
10
INPUT VOLTAGE (V)
1460-2.5 G04
1460-2.5 G05
25°C
OUTPUT VOLTAGE (V)
2.501
2.500
2.499
Power Supply Rejection Ratio
vs Frequency
90
POWER SUPPLY REJECTION RATIO (dB)
OUTPUT IMPEDANCE (Ω)
70
60
50
40
30
20
10
0
–10
100
100
C
L
= 0
LOAD CAPACITANCE (µF)
80
1k
10k
100k
FREQUENCY (Hz)
Output Voltage Noise Spectrum
1000
NOISE VOLTAGE (nV/√Hz)
OUTPUT NOISE (10µV/DIV)
OUTPUT VOLTAGE (V)
100
10
100
1k
10k
FREQUENCY (Hz)
100k
1460-2.5 G10
U W
Supply Current vs Input Voltage
175
125°C
2.5014
2.5010
2.5006
Line Regulation
125°C
25°C
2.5002
2.4998
–55°C
2.4994
2.4990
–55°C
15
20
0
2
4
6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
1460-2.5 G06
Output Impedance vs Frequency
1k
C
L
= 0.1µF
Transient Responses
10
1
0.1
10
0
I
OUT
= 10mA
C
L
= 1µF
1460 G09
1
1M
1460-2.5 G07
10
100
1k
10k
FREQUENCY (Hz)
100k
1M
1460-2.5 G08
Output Noise 0.1Hz to 10Hz
2.5000
Long-Term Drift
Three Typical Parts (S8 Package)
2.4998
2.4996
2.4994
2.4992
0
1
2
3
4 5 6
TIME (SEC)
7
8
9
10
2.4990
0
200
600
400
TIME (HOURS)
800
1000
1460-2.5 G11
1460-2.5 G12
5
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