1
LT1460-2.5
Micropower Precision
Series Reference
s
Trimmed to High Accuracy: 0.075% Max
s
Low Drift: 10ppm/
C Max
s
Industrial Temperature Range SO Package
s
Temperature Coefficient Guaranteed to 125
C
s
Low Supply Current: 130
A Max
s
Minimum Output Current: 20mA
s
No Output Capacitor Required
s
Reverse Battery Protection
s
Minimum Input/Output Differential: 0.9V
s
Available in Small MSOP Package
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).
OUTPUT VOLTAGE ERROR (%)
0.10
UNITS (%)
0.06
0.02 0
1460-2.5 TA02
0.06
0.02
20
18
16
14
12
10
8
6
4
2
0
0.10
1400 PARTS
FROM 2 RUNS
Typical Distribution of Output Voltage
S8 Package
s
Handheld Instruments
s
Precision Regulators
s
A/D and D/A Converters
s
Power Supplies
s
Hard Disk Drives
, LTC and LT are registered trademarks of Linear Technology Corporation.
DESCRIPTIO
U
TYPICAL APPLICATIO
U
APPLICATIO S
U
FEATURES
Basic Connection
LT1460-2.5
GND
IN
OUT
1460-2.5 TA01
C1
0.1
F
2.5V
3.4V
TO 20V
2
LT1460-2.5
ABSOLUTE
M
AXI
M
U
M
RATINGS
W
W
W
U
PACKAGE/ORDER I
N
FOR
M
ATIO
N
W
U
U
Input Voltage ........................................................... 30V
Reverse Voltage .................................................... 15V
Output Short-Circuit Duration, T
A
= 25
C
V
IN
> 10V ........................................................... 5 sec
V
IN
10V ................................................... Indefinite
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
S8 PART MARKING
Available Options
TEMPERATURE
PACKAGE TYPE
ACCURACY
COEFFICIENT
TEMPERATURE
(%)
(ppm/
C)
N8
S8
MS8
Z
0
C to 70
C
0.075
10
LT1460ACN8-2.5
LT1460ACS8-2.5
40
C to 85
C
0.10
10
LT1460BIN8-2.5
LT1460BIS8-2.5
0
C to 70
C
0.10
15
LT1460CCMS8-2.5
0
C to 70
C
0.10
20
LT1460DCN8-2.5
LT1460DCS8-2.5
40
C to 85
C
0.125
20
LT1460EIN8-2.5
LT1460EIS8-2.5
0
C to 70
C
0.15
25
LT1460FCMS8-2.5
0
C to 70
C
0.25
25
LT1460GCZ-2.5
40
C to 85
C
0.25
25
LT1460GIZ-2.5
40
C to 85
C/125
C
0.20
20/50
LT1460LHS8-2.5
40
C to 125
C
0.20
50
LT1460MHS8-2.5
Consult factory for Military grade parts.
ORDER PART NUMBER
T
JMAX
= 125
C,
JA
= 250
C/ W
MS8 PART MARKING
LTAA
LTAB
LT1460CCMS8-2.5
LT1460FCMS8-2.5
1
2
3
4
DNC*
V
IN
DNC*
GND
8
7
6
5
DNC*
DNC*
V
OUT
DNC*
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
*CONNECTED INTERNALLY.
DO NOT CONNECT EXTERNAL
CIRCUITRY TO THESE PINS
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
LT1460LHS8-2.5
LT1460MHS8-2.5
ORDER PART NUMBER
1
2
3
BOTTOM VIEW
V
IN
V
OUT
GND
Z PACKAGE
3-LEAD TO-92 PLASTIC
LT1460GCZ-2.5
LT1460GIZ-2.5
T
JMAX
= 125
C,
JA
= 160
C/ W
T
JMAX
= 125
C,
JA
= 130
C/ W (N8)
T
JMAX
= 125
C,
JA
= 190
C/ W (S8)
1
2
3
4
8
7
6
5
TOP VIEW
DNC*
V
IN
DNC*
GND
DNC*
DNC*
V
OUT
DNC*
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
*CONNECTED INTERNALLY.
DO NOT CONNECT
EXTERNAL CIRCUITRY
TO THESE PINS
1460A2
460BI2
460LH2
460MH2
1460D2
460EI2
(Note 1)
3
LT1460-2.5
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage (Note 3)
LT1460ACN8, ACS8
2.49813
2.500
2.50188
V
0.075
0.075
%
LT1460BIN8, BIS8, CCMS8, DCN8, DCS8
2.4975
2.500
2.5025
V
0.10
0.10
%
LT1460EIN8, EIS8
2.49688
2.500
2.50313
V
0.125
0.125
%
LT1460FCMS8
2.49625
2.500
2.50375
V
0.15
0.15
%
LT1460GCZ, GIZ
2.49375
2.500
2.50625
V
0.25
0.25
%
LT1460LHS8, MHS8
2.495
2.500
2.505
V
0.20
0.20
%
Output Voltage Temperature Coefficient (Note 4)
T
MIN
T
J
T
MAX
LT1460ACN8, ACS8, BIN8, BIS8
q
5
10
ppm/
C
LT1460CCMS8
q
7
15
ppm/
C
LT1460DCN8, DCS8, EIN8, EIS8
q
10
20
ppm/
C
LT1460FCMS8, GCZ, GIZ
q
12
25
ppm/
C
LT1460LHS8
40
C to 85
C
q
10
20
ppm/
C
40
C to 125
C
q
25
50
ppm/
C
LT1460MHS8
40
C to 125
C
q
25
50
ppm/
C
Line Regulation
3.4V
V
IN
5V
30
60
ppm/V
q
80
ppm/V
5V
V
IN
20V
10
25
ppm/V
q
35
ppm/V
Load Regulation Sourcing (Note 5)
I
OUT
= 100
A
1500
2800
ppm/mA
q
3500
ppm/mA
I
OUT
= 10mA
80
135
ppm/mA
q
180
ppm/mA
I
OUT
= 20mA
70
100
ppm/mA
0
C to 70
C
q
140
ppm/mA
Thermal Regulation (Note 6)
P = 200mW
0.5
2.5
ppm/mW
Dropout Voltage (Note 7)
V
IN
V
OUT
,
V
OUT
0.1%, I
OUT
= 0
q
0.9
V
V
IN
V
OUT
,
V
OUT
0.1%, I
OUT
= 10mA
1.3
V
q
1.4
V
Output Current
Short V
OUT
to GND
40
mA
Reverse Leakage
V
IN
= 15V
q
0.5
10
A
Supply Current
100
130
A
q
165
A
Output Voltage Noise (Note 8)
0.1Hz
f
10Hz
10
V
P-P
10Hz
f
1kHz
10
V
RMS
Long-Term Stability of Output Voltage, S8 Pkg (Note 9)
40
ppm/
kHr
Hysteresis (Note 10)
T = 40
C to 85
C
160
ppm
T = 0
C to 70
C
25
ppm
ELECTRICAL CHARACTERISTICS
V
IN
= 5V, I
OUT
= 0, T
A
= 25
C unless otherwise specified.
4
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.
OUTPUT CURRENT (mA)
0.1
OUTPUT VOLTAGE CHANGE (mV)
6
5
4
3
2
1
0
1
10
100
1460-2.5 G02
125
C
25
C
55
C
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
INPUT-OUTPUT VOLTAGE (V)
0
OUTPUT CURRENT (mA)
100
10
1
0.1
1.0
0.5
1.5
2.0
2.5
1460-2.5 G01
125
C
55
C
25
C
Minimum Input-Output Voltage
Differential
Load Regulation, Sourcing
OUTPUT CURRENT (mA)
0
0.5
OUTPUT VOLTAGE CHANGE (mV)
1.0
1.5
1460
-2.5
G03
80
70
60
50
40
30
20
10
0
55
C
125
C
25
C
Load Regulation, Sinking
5
LT1460-2.5
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
FREQUENCY (Hz)
10
OUTPUT IMPEDANCE (
)
1k
100
10
1
1k
100
10k
100k
1M
1460-2.5 G08
C
L
= 0
C
L
= 0.1
F
C
L
= 1
F
LOAD CAPACITANCE (
F)
Transient Responses
I
OUT
= 10mA
1460 G09
FREQUENCY (Hz)
POWER SUPPLY REJECTION RATIO (dB)
90
80
70
60
50
40
30
20
10
0
10
100
10k
100k
1M
1460-2.5 G07
1k
10
1
0.1
0
Power Supply Rejection Ratio
vs Frequency
Output Impedance vs Frequency
Output Voltage Noise Spectrum
FREQUENCY (Hz)
100
1000
10
1k
10k
1460
-2.5
G10
100
100k
NOISE VOLTAGE (nV/
Hz)
TIME (SEC)
0
1
2
3
4
5
6
7
8
9
10
OUTPUT NOISE (10
V/DIV)
1460
-2.5
G11
Output Noise 0.1Hz to 10Hz
TIME (HOURS)
0
OUTPUT VOLTAGE (V)
2.5000
2.4998
2.4996
2.4994
2.4992
2.4990
800
1460
-2.5
G12
200
400
600
1000
Long-Term Drift
Three Typical Parts (S8 Package)
Supply Current vs Input Voltage
INPUT VOLTAGE (V)
0
175
150
125
100
75
50
25
0
15
1460-2.5 G05
5
10
20
SUPPLY CURRENT (
A)
125
C
25
C
55
C
INPUT VOLTAGE (V)
0
OUTPUT VOLTAGE (V)
4
8
10
20
1460-2.5 G06
2
6
12 14 16 18
2.5014
2.5010
2.5006
2.5002
2.4998
2.4994
2.4990
125
C
25
C
55
C
Line Regulation
TEMPERATURE (
C)
50
OUTPUT VOLTAGE (V)
2.503
2.502
2.501
2.500
2.499
2.498
25
0
25
50
1460
-2.5
G04
75
100
3 TYPICAL PARTS
Output Voltage Temperature Drift
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