Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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
INITIAL ACCURACY
TEMPERATURE COEFFICIENT
0.05%
5ppm/°C
0.1%
10ppm/°C
2.048
0.05%
5ppm/°C
0.1%
10ppm/°C
2.500
0.05%
5ppm/°C
0.1%
10ppm/°C
3.000
0.05%
5ppm/°C
0.1%
10ppm/°C
3.300
0.05%
5ppm/°C
0.1%
10ppm/°C
4.096
0.05%
5ppm/°C
0.1%
10ppm/°C
5.000
0.05%
5ppm/°C
0.1%
10ppm/°C
**See Order Information section for complete part number listing.
OUTPUT VOLTAGE
1.250
PART NUMBER**
LTC6652AHMS8-1.25
LTC6652BHMS8-1.25
LTC6652AHMS8-2.048
LTC6652BHMS8-2.048
LTC6652AHMS8-2.5
LTC6652BHMS8-2.5
LTC6652AHMS8-3
LTC6652BHMS8-3
LTC6652AHMS8-3.3
LTC6652BHMS8-3.3
LTC6652AHMS8-4.096
LTC6652BHMS8-4.096
LTC6652AHMS8-5
LTC6652BHMS8-5
6652fb
2
LTC6652
ELECTRICAL CHARACTERISTICS
PARAMETER
Output Voltage
Output Voltage Temperature Coefficient
(Note 3)
Line Regulation
Load Regulation (Note 4)
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
+ 0.5V, unless otherwise noted.
CONDITIONS
LTC6652A
LTC6652B
LTC6652A
LTC6652B
V
OUT
+ 0.5V ≤ V
IN
≤ 13.2V,
SHDN
= V
IN
I
SOURCE
= 5mA, LTC6652-1.25, LTC6652-2.048,
LTC6652-2.5, LTC6652-3, LTC6652-3.3, LTC6652-
4.096, LTC6652-5
I
SINK
= 1mA, LTC6652-1.25, LTC6652-2.048
I
SINK
= 5mA, LTC6652-2.5, LTC6652-3,
LTC6652-3.3, LTC6652-4.096, LTC6652-5
I
SOURCE
= 5mA, V
OUT
Error ≤ 0.1%
LTC6652-1.25, LTC6652-2.048
LTC6652-2.5, LTC6652-3, LTC6652-3.3,
LTC6652-4.096, LTC6652-5
Short V
OUT
to GND
Short V
OUT
to V
IN
Logic High Input Voltage
Logic High Input Current
Logic Low Input Voltage
Logic Low Input Current
No Load
SHDN
Tied to GND
0.1Hz ≤ f ≤ 10Hz
LTC6652-1.25
LTC6652-2.048, LTC6652-2.5, LTC6652-3
LTC6652-3.3
LTC6652-4.096
LTC6652-5
10Hz ≤ f ≤ 1kHz
0.1% Settling, C
LOAD
= 0
MIN
–0.05
–0.1
l
l
l
l
TYP
2
4
2
20
MAX
0.05
0.1
5
10
50
80
75
200
250
600
150
450
UNITS
%
%
ppm/°C
ppm/°C
ppm/V
ppm/V
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
ppm/mA
V
V
l
l
l
l
80
50
Minimum Operating Voltage (Note 5)
2.7
V
OUT
+ 0.3V
16
16
Output Short-Circuit Current
Shutdown Pin (SHDN)
l
l
l
l
l
l
2
0.1
0.1
350
0.1
2.4
2.1
2.2
2.3
2.8
3
100
60
105
1
0.8
1
560
2
Supply Current
Shutdown Current
Output Voltage Noise (Note 6)
mA
mA
V
μA
V
μA
μA
μA
μA
ppm
P-P
ppm
P-P
ppm
P-P
ppm
P-P
ppm
P-P
ppm
RMS
μs
ppm/√khr
ppm
Turn-On Time
Long Term Drift of Output Voltage (Note 7)
Hysteresis (Note 8)
Δ
T
= –40°C to 125°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.
Note 2:
If the parts are stored outside of the specified temperature range,
the output may shift due to hysteresis.
Note 3:
Temperature coefficient is measured by dividing the maximum
change in output voltage by the specified temperature range.
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:
Excludes load regulation errors.
Note 6:
Peak-to-peak noise is measured with a 3-pole highpass at 0.1Hz
and 4-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 seconds. RMS noise is measured on a spectrum analyzer in
a shielded environment where the intrinsic noise of the instrument is
removed to determine the actual noise of the device.
Note 7:
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 8:
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 the hot
or cold temperature limit before successive measurements. Hysteresis
is roughly proportional to the square of the temperature change. For
instruments that are stored at well controlled temperatures (within 20 or 30
degrees of operational temperature) it’s usually not a dominant error source.
Note 9:
The stated temperature is typical for soldering of the leads during
manual rework. For detailed IR reflow recommendations, refer to the
Applications section.
6652fb
3
LTC6652
Characteristic curves are similar for most
LTC6652s. Curves from the LTC6652-1.25, LTC6652-2.5 and the LTC6652-5 represent the extremes and typical of the voltage options.
Characteristic curves for other output voltages fall between these curves and can be estimated based on their output.
1.25V Output Voltage
Temperature Drift
1.2510
3 TYPICAL PARTS
1.2506
1.2504
REFERENCE VOLTAGE (V)
OUTPUT VOLTAGE (V)
1.2505
125°C
1.2502
1.2500
25°C
1.2498
1.2496
1.2490
–80
1.2494
0
2
8
6
10
4
INPUT VOLTAGE (V)
12
14
6652 G18
TYPICAL PERFORMANCE CHARACTERISTICS
1.25V Line Regulation
1.25V Load Regulation (Sourcing)
0
OUTPUT VOLTAGE CHANGE (ppm)
–40 C
–50
25 C
125 C
–150
–100
1.2500
1.2495
–40°C
–200
–40
80
40
0
TEMPERATURE (°C)
120
160
6652 G17
–250
0.1
1
OUTPUT CURRENT (mA)
10
6652 G19
1.25V Load Regulation (Sinking)
400
OUTPUT VOLTAGE CHANGE (ppm)
350
125°C
OUTPUT NOISE (1μV/DIV)
300
250
200
150
100
–40°C
50
0
0.1
1
OUTPUT CURRENT (mA)
10
6652 G20
1.25V Low Frequency 0.1Hz to
10Hz Transient Noise
400
1.25V Output Voltage Noise
Spectrum
NOISE VOLTAGE (nV/√Hz)
TIME (1 SECOND/DIV)
6652 G21
300
25°C
200
100
0
0.01
0.1
1
FREQUENCY (kHz)
10
6652 G22
1.25 Sinking Current Without
Output Capacitor
1mA
I
OUT
0mA
I
OUT
1mA
0mA
1.25 Sinking Current with Output
Capacitor
10μF
1μF
OUTPUT CAPACITOR
0.1μF
10nF
1nF
100pF
NO CAP
1.25V Stability with Output
Capacitance
V
OUT
500mV/DIV
V
OUT
500mV/DIV
REGION OF
MARGINAL
STABILITY
500μs/DIV
C
OUT
= 0μF
6652 G23
500μs/DIV
C
OUT
= 1μF
6652 G24
–5
–1 0
LOAD CURRENT (mA)
5
6652 G16
6652fb
4
LTC6652
Characteristic curves are similar for most
LTC6652s. Curves from the LTC6652-1.25, LTC6652-2.5 and the LTC6652-5 represent the extremes and typical of the voltage options.
Characteristic curves for other output voltages fall between these curves and can be estimated based on their output.
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