LT1790ACS6-3.3 [Linear]
Micropower SOT-23 Low Dropout Reference Family; 微SOT- 23低压差基准系列
| 型号： | LT1790ACS6-3.3 |
| 厂家： | 
Linear |
| 描述： | Micropower SOT-23 Low Dropout Reference Family |
| 文件： | 总24页 (文件大小：294K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1790
Micropower SOT-23
Low Dropout Reference Family
U
FEATURES
DESCRIPTIO
The LT®1790 is a family of SOT-23 micropower low
dropoutseriesreferencesthatcombinehighaccuracyand
low drift with low power dissipation and small package
size. These micropower references use curvature com-
pensation to obtain a low temperature coefficient and
trimmed precision thin-film resistors to achieve high
output accuracy. In addition, each LT1790 is post-pack-
age trimmed to greatly reduce the temperature coefficient
and increase the output accuracy. Output accuracy is
further assured by excellent line and load regulation.
Specialcarehasbeentakentominimizethermallyinduced
hysteresis.
■
High Accuracy:
A Grade—0.05% Max
B Grade—0.1% Max
Low Drift:
A Grade—10ppm/
■
°
C Max
B Grade—25ppm/
°C Max
Low Profile (1mm) ThinSOTTM Package
Low Supply Current: 60µA Max
Sinks and Sources Current
Low Dropout Voltage
Guaranteed Operational –40°C to 125°C
Wide Supply Range to 18V
■
■
■
■
■
■
■
Available Output Voltage Options: 1.25V, 2.048V,
The LT1790s are ideally suited for battery-operated sys-
tems because of their small size, low supply current and
reduceddropoutvoltage.Thesereferencesprovidesupply
current and power dissipation advantages over shunt
referencesthatmustidletheentireloadcurrenttooperate.
Since the LT1790 can also sink current, it can operate as
a micropower negative voltage reference with the same
performance as a positive reference.
2.5V, 3V, 3.3V, 4U.096V and 5V
APPLICATIO S
■
Handheld Instruments
■
Negative Voltage References
■
Industrial Control Systems
■
Data Acquisition Systems
■
Battery-Operated Equipment
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
U
TYPICAL APPLICATIO
Typical VOUT Distribution for LT1790-2.5
50
167 UNITS
45
40
Positive Connection for LT1790-2.5
LT1790B LIMITS
35
LT1790A LIMITS
30
25
20
15
10
5
4
6
V
= 2.5V
LT1790-2.5
1, 2
2.6V ≤ V ≤ 18V
IN
OUT
0.1µF
1µF
1790 TA01
0
2.498
2.499 2.500
2.501
2.502
OUTPUT VOLTAGE (V)
1790 TA02
1790fa
1
LT1790
ABSOLUTE AXI U RATI GS
W W
U W
(Note 1)
Input Voltage .......................................................... 20V
Operating Temperature Range
(Note 2) ........................................... –40°C to 125°C
Storage Temperature Range
(Note 3) ........................................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
Specified Temperature Range
Commercial ............................................ 0°C to 70°C
Industrial ............................................ –40°C to 85°C
Output Short-Circuit Duration......................... Indefinite
U W
U
PACKAGE/ORDER I FOR ATIO
ORDER
PART NUMBER
OUTPUT
VOLTAGE
S6
PART MARKING*
LT1790AIS6-1.25
1.250V
2.048V
2.500V
3.000V
3.300V
4.096V
5.000V
LTXT
LTXU
LTPZ
LTQA
LTXW
LTQB
LTQC
LT1790ACS6-1.25
LT1790BCS6-1.25
LT1790ACS6-2.048
LT1790BCS6-2.048
LT1790ACS6-2.5
LT1790BCS6-2.5
LT1790ACS6-3
LT1790BIS6-1.25
LT1790AIS6-2.048
LT1790BIS6-2.048
LT1790AIS6-2.5
LT1790BIS6-2.5
LT1790AIS6-3
TOP VIEW
GND 1
GND 2
6 V
OUT
5 DNC*
4 V
DNC* 3
IN
S6 PACKAGE
6-LEAD PLASTIC SOT-23
LT1790BIS6-3
LT1790BCS6-3
T
= 150°C, θ = 230°C/W
JA
JMAX
LT1790AIS6-3.3
LT1790BIS6-3.3
LT1790AIS6-4.096
LT1790BIS6-4.096
LT1790AIS6-5
LT1790ACS6-3.3
LT1790BCS6-3.3
LT1790ACS6-4.096
LT1790BCS6-4.096
LT1790ACS6-5
*DNC: DO NOT CONNECT
LT1790BIS6-5
LT1790BCS6-5
* The temperature grades and parametric grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider
operating temperature ranges.
U
AVAILABLE OPTIO S
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
OUTPUT
VOLTAGE
INITIAL
ACCURACY
TEMPERATURE
COEFFICEINT
ORDER PART NUMBER
ORDER PART NUMBER
1.250V
2.048V
2.500V
3.000V
3.300V
4.096V
5.000V
0.05%
0.1%
10ppm/°C
25ppm/°C
LT1790ACS6-1.25
LT1790BCS6-1.25
LT1790AIS6-1.25
LT1790BIS6-1.25
0.05%
0.1%
10ppm/°C
25ppm/°C
LT1790ACS6-2.048
LT1790BCS6-2.048
LT1790AIS6-2.048
LT1790BIS6-2.048
0.05%
0.1%
10ppm/°C
25ppm/°C
LT1790ACS6-2.5
LT1790BCS6-2.5
LT1790AIS6-2.5
LT1790BIS6-2.5
0.05%
0.1%
10ppm/°C
25ppm/°C
LT1790ACS6-3
LT1790BCS6-3
LT1790AIS6-3
LT1790BIS6-3
0.05%
0.1%
10ppm/°C
25ppm/°C
LT1790ACS6-3.3
LT1790BCS6-3.3
LT1790AIS6-3.3
LT1790BIS6-3.3
0.05%
0.1%
10ppm/°C
25ppm/°C
LT1790ACS6-4.096
LT1790BCS6-4.096
LT1790AIS6-4.096
LT1790BIS6-4.096
0.05%
0.1%
10ppm/°C
25ppm/°C
LT1790ACS6-5
LT1790BCS6-5
LT1790AIS6-5
LT1790BIS6-5
1790fa
2
LT1790
1.25V ELECTRICAL CHARACTERISTICS
The ● denotes specifications that apply over the specified
temperature range, otherwise specifications are at TA = 25°C. CL = 1µF and VIN = 2.6V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage (Notes 3, 4)
LT1790A
1.24937
–0.05
1.250
1.25062
0.05
V
%
LT1790B
LT1790AC
LT1790AI
LT1790BC
LT1790BI
1.24875
–0.10
1.250
1.250
1.250
1.250
1.250
1.25125
0.10
V
%
●
●
1.24850
–0.120
1.25150
0.120
V
%
●
●
1.24781
–0.175
1.25219
0.175
V
%
●
●
1.24656
–0.275
1.25344
0.275
V
%
●
●
1.24484
–0.4125
1.25516
0.4125
V
%
Output Voltage Temperature Coefficient (Note 5)
T
≤ T ≤ T
MIN A MAX
LT1790A
LT1790B
●
●
5
12
10
25
ppm/°C
ppm/°C
Line Regulation
2.6V ≤ V ≤ 18V
50
170
220
ppm/V
ppm/V
IN
●
●
●
Load Regulation (Note 6)
I
I
Source = 5mA, V = 2.8V
100
120
160
250
ppm/mA
ppm/mA
OUT
OUT
IN
Sink = 1mA, V = 3.2V
180
250
ppm/mA
ppm/mA
IN
Minimum Operating Voltage (Note 7)
Supply Current
V , ∆V
= 0.1%
IN
OUT
I
= 0mA
1.95
2.15
2.50
2.90
2.95
V
V
V
V
OUT
●
●
●
I
I
Source = 5mA
Sink = 1mA
OUT
OUT
No Load
35
60
75
µA
µA
●
Minimum Operating Current—
Negative Output (See Figure 7)
V
C
= –1.25V, ±0.1%
100
250
125
µA
OUT
Turn-On Time
= 1µF
µs
LOAD
Output Noise (Note 8)
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
10
14
µV
P-P
µV
RMS
Long-Term Drift of Output Voltage (Note 9)
Hysteresis (Note 10)
50
ppm/√kHr
∆T = 0°C to 70°C
∆T = –40°C to 85°C
●
●
40
100
ppm
ppm
1790fa
3
LT1790
2.048V ELECTRICAL CHARACTERISTICS
The ● denotes specifications that apply over the specified
temperature range, otherwise specifications are at TA = 25°C. CL = 1µF and VIN = 2.8V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage (Notes 3, 4)
LT1790A
2.04697
–0.05
2.048
2.04902
0.05
V
%
LT1790B
LT1790AC
LT1790AI
LT1790BC
LT1790BI
2.04595
–0.10
2.048
2.048
2.048
2.048
2.048
2.05005
0.10
V
%
●
●
2.04554
–0.120
2.05046
0.120
V
%
●
●
2.04442
–0.175
2.05158
0.175
V
%
●
●
2.04237
–0.275
2.05363
0.275
V
%
●
●
2.03955
–0.4125
2.05645
0.4125
V
%
Output Voltage Temperature Coefficient (Note 5)
T
≤ T ≤ T
MIN A MAX
LT1790A
LT1790B
●
●
5
12
10
25
ppm/°C
ppm/°C
Line Regulation
2.8V ≤ V ≤ 18V
50
170
220
ppm/V
ppm/V
IN
●
●
●
Load Regulation (Note 6)
I
I
Source = 5mA
Sink = 3mA
120
130
200
280
ppm/mA
ppm/mA
OUT
OUT
260
450
ppm/mA
ppm/mA
Dropout Voltage (Note 7)
Supply Current
V
– V , ∆V
OUT
= 0.1%
IN
OUT
OUT
I
= 0mA
50
100
500
750
450
mV
mV
mV
mV
●
●
●
I
I
Source = 5mA
Sink = 3mA
OUT
OUT
No Load
35
60
75
µA
µA
●
Minimum Operating Current—
Negative Output (See Figure 7)
V
C
= –2.048V, 0.1%
100
350
125
µA
OUT
Turn-On Time
= 1µF
µs
LOAD
Output Noise (Note 8)
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
22
41
µV
P-P
RMS
µV
Long-Term Drift of Output Voltage (Note 9)
Hysteresis (Note 10)
50
ppm/√kHr
∆T = 0°C to 70°C
∆T = –40°C to 85°C
●
●
40
100
ppm
ppm
1790fa
4
LT1790
2.5V ELECTRICAL CHARACTERISTICS
The ● denotes specifications that apply over the specified
temperature range, otherwise specifications are at TA = 25°C. CL = 1µF and VIN = 3V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage (Notes 3, 4)
LT1790A
2.49875
–0.05
2.5
2.50125
0.05
V
%
LT1790B
LT1790AC
LT1790AI
LT1790BC
LT1790BI
2.4975
–0.10
2.5
2.5
2.5
2.5
2.5
2.5025
0.10
V
%
●
●
2.4970
–0.120
2.5030
0.120
V
%
●
●
2.49563
–0.175
2.50438
0.175
V
%
●
●
2.49313
–0.275
2.50688
0.275
V
%
●
●
2.48969
–0.4125
2.51031
0.4125
V
%
Output Voltage Temperature Coefficient (Note 5)
T
≤ T ≤ T
MIN A MAX
LT1790A
LT1790B
●
●
5
12
10
25
ppm/°C
ppm/°C
Line Regulation
3V ≤ V ≤ 18V
50
80
70
170
220
ppm/V
ppm/V
IN
●
●
●
Load Regulation (Note 6)
I
I
Source = 5mA
Sink = 3mA
160
250
ppm/mA
ppm/mA
OUT
OUT
110
300
ppm/mA
ppm/mA
Dropout Voltage (Note 7)
Supply Current
V
– V , ∆V
OUT
= 0.1%
IN
OUT
OUT
I
= 0mA
50
100
120
450
250
mV
mV
mV
mV
●
●
●
I
I
Source = 5mA
Sink = 3mA
OUT
OUT
No Load
35
60
80
µA
µA
●
Minimum Operating Current—
Negative Output (See Figure 7)
V
C
= –2.5V, 0.1%
100
700
125
µA
OUT
Turn-On Time
= 1µF
µs
LOAD
Output Noise (Note 8)
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
32
48
µV
P-P
RMS
µV
Long-Term Drift of Output Voltage (Note 9)
Hysteresis (Note 10)
50
ppm/√kHr
∆T = 0°C to 70°C
∆T = –40°C to 85°C
●
●
40
100
ppm
ppm
1790fa
5
LT1790
3V ELECTRICAL CHARACTERISTICS
The ● denotes specifications that apply over the specified temperature
range, otherwise specifications are at TA = 25°C. CL = 1µF and VIN = 3.5V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage (Notes 3, 4)
LT1790A
2.9985
–0.05
3
3.0015
0.05
V
%
LT1790B
LT1790AC
LT1790AI
LT1790BC
LT1790BI
2.9970
–0.10
3
3
3
3
3
3.003
0.10
V
%
●
●
2.99640
–0.120
3.00360
0.120
V
%
●
●
2.99475
–0.175
3.00525
0.175
V
%
●
●
2.99175
–0.275
3.00825
0.275
V
%
●
●
2.98763
–0.4125
3.01238
0.4125
V
%
Output Voltage Temperature Coefficient (Note 5)
T
≤ T ≤ T
MIN A MAX
LT1790A
LT1790B
●
●
5
12
10
25
ppm/°C
ppm/°C
Line Regulation
3.5V ≤ V ≤ 18V
50
80
70
170
220
ppm/V
ppm/V
IN
●
●
●
Load Regulation (Note 6)
I
I
Source = 5mA
Sink = 3mA
160
250
ppm/mA
ppm/mA
OUT
OUT
110
300
ppm/mA
ppm/mA
Dropout Voltage (Note 7)
Supply Current
V
– V , ∆V
OUT
= 0.1%
IN
OUT
OUT
I
= 0mA
50
100
120
450
250
mV
mV
mV
mV
●
●
●
I
I
Source = 5mA
Sink = 3mA
OUT
OUT
No Load
35
60
80
µA
µA
●
Minimum Operating Current—
Negative Output (See Figure 7)
V
C
= –3V, 0.1%
100
700
125
µA
OUT
Turn-On Time
= 1µF
µs
LOAD
Output Noise (Note 8)
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
50
56
µV
P-P
RMS
µV
Long-Term Drift of Output Voltage (Note 9)
Hysteresis (Note 10)
50
ppm/√kHr
∆T = 0°C to 70°C
∆T = –40°C to 85°C
●
●
40
100
ppm
ppm
1790fa
6
LT1790
3.3V ELECTRICAL CHARACTERISTICS
The ● denotes specifications that apply over the specified
temperature range, otherwise specifications are at TA = 25°C. CL = 1µF and VIN = 3.8V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage (Notes 3, 4)
LT1790A
3.29835
–0.05
3.3
3.30165
0.05
V
%
LT1790B
LT1790AC
LT1790AI
LT1790BC
LT1790BI
3.2967
–0.10
3.3
3.3
3.3
3.3
3.3
3.3033
0.10
V
%
●
●
3.29604
–0.120
3.30396
0.120
V
%
●
●
3.29423
–0.175
3.30578
0.175
V
%
●
●
3.29093
–0.275
3.30908
0.275
V
%
●
●
3.28639
–0.4125
3.31361
0.4125
V
%
Output Voltage Temperature Coefficient (Note 5)
T
≤ T ≤ T
MIN A MAX
LT1790A
LT1790B
●
●
5
12
10
25
ppm/°C
ppm/°C
Line Regulation
3.8V ≤ V ≤ 18V
50
80
70
170
220
ppm/V
ppm/V
IN
●
●
●
Load Regulation (Note 6)
I
I
Source = 5mA
Sink = 3mA
160
250
ppm/mA
ppm/mA
OUT
OUT
110
300
ppm/mA
ppm/mA
Dropout Voltage (Note 7)
Supply Current
V
– V , ∆V
OUT
= 0.1%
IN
OUT
OUT
I
= 0mA
50
100
120
450
250
mV
mV
mV
mV
●
●
●
I
I
Source = 5mA
Sink = 3mA
OUT
OUT
No Load
35
60
80
µA
µA
●
Minimum Operating Current—
Negative Output (See Figure 7)
V
C
= –3.3V, 0.1%
100
700
125
µA
OUT
Turn-On Time
= 1µF
µs
LOAD
Output Noise (Note 8)
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
50
67
µV
P-P
RMS
µV
Long-Term Drift of Output Voltage (Note 9)
Hysteresis (Note 10)
50
ppm/√kHr
∆T = 0°C to 70°C
∆T = –40°C to 85°C
●
●
40
100
ppm
ppm
1790fa
7
LT1790
4.096V ELECTRICAL CHARACTERISTICS
The ● denotes specifications that apply over the specified
temperature range, otherwise specifications are at TA = 25°C. CL = 1µF and VIN = 4.6V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage (Notes 3, 4)
LT1790A
4.094
–0.05
4.096
4.098
0.05
V
%
LT1790B
LT1790AC
LT1790AI
LT1790BC
LT1790BI
4.092
–0.10
4.096
4.096
4.096
4.096
4.096
4.10
0.10
V
%
●
●
4.09108
–0.120
4.10092
0.120
V
%
●
●
4.08883
–0.175
4.10317
0.175
V
%
●
●
4.08474
–0.275
4.10726
0.275
V
%
●
●
4.07910
–0.4125
4.11290
0.4125
V
%
Output Voltage Temperature Coefficient (Note 5)
T
≤ T ≤ T
MIN A MAX
LT1790A
LT1790B
●
●
5
12
10
25
ppm/°C
ppm/°C
Line Regulation
4.6V ≤ V ≤ 18V
50
80
70
170
220
ppm/V
ppm/V
IN
●
●
●
Load Regulation (Note 6)
I
I
Source = 5mA
Sink = 3mA
160
250
ppm/mA
ppm/mA
OUT
OUT
110
300
ppm/mA
ppm/mA
Dropout Voltage (Note 7)
Supply Current
V
– V , ∆V
OUT
= 0.1%
OUT
IN
OUT
I
= 0mA
50
100
120
450
250
mV
mV
mV
mV
●
●
●
I
I
Source = 5mA
Sink = 3mA
OUT
OUT
No Load
35
60
80
µA
µA
●
Minimum Operating Current—
Negative Output (See Figure 7)
V
C
= –4.096V, 0.1%
100
700
125
µA
OUT
Turn-On Time
= 1µF
µs
LOAD
Output Noise (Note 8)
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
60
89
µV
P-P
RMS
µV
Long-Term Drift of Output Voltage (Note 9)
Hysteresis (Note 10)
50
ppm/√kHr
∆T = 0°C to 70°C
∆T = –40°C to 85°C
●
●
40
100
ppm
ppm
1790fa
8
LT1790
5V ELECTRICAL CHARACTERISTICS
The ● denotes specifications that apply over the specified temperature
range, otherwise specifications are at TA = 25°C. CL = 1µF and VIN = 5.5V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage (Notes 3, 4)
LT1790A
4.9975
–0.05
5
5.0025
0.05
V
%
LT1790B
LT1790AC
LT1790AI
LT1790BC
LT1790BI
4.995
–0.10
5
5
5
5
5
5.005
0.10
V
%
●
●
4.99400
–0.120
5.00600
0.120
V
%
●
●
4.99125
–0.175
5.00875
0.175
V
%
●
●
4.98625
–0.275
5.01375
0.275
V
%
●
●
4.97938
–0.4125
5.02063
0.4125
V
%
Output Voltage Temperature Coefficient (Note 5)
T
≤ T ≤ T
MIN A MAX
LT1790A
LT1790B
●
●
5
12
10
25
ppm/°C
ppm/°C
Line Regulation
5.5V ≤ V ≤ 18V
50
80
70
170
220
ppm/V
ppm/V
IN
●
●
●
Load Regulation (Note 6)
I
I
Source = 5mA
Sink = 3mA
160
250
ppm/mA
ppm/mA
OUT
OUT
110
300
ppm/mA
ppm/mA
Dropout Voltage (Note 7)
Supply Current
V
– V , ∆V
= 0.1%
IN
I
OUT
OUT
= 0mA
50
100
120
450
250
mV
mV
mV
mV
OUT
●
●
●
I
I
Source = 5mA
Sink = 3mA
OUT
OUT
No Load
35
60
80
µA
µA
●
Minimum Operating Current—
Negative Output (See Figure 7)
V
= –5V, 0.1%
100
125
µA
OUT
Turn-On Time
C
= 1µF
700
µs
LOAD
Output Noise (Note 8)
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
80
118
µV
P-P
µV
RMS
Long-Term Drift of Output Voltage (Note 9)
Hysteresis (Note 10)
50
ppm/√kHr
∆T = 0°C to 70°C
∆T = –40°C to 85°C
●
●
40
100
ppm
ppm
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: The LT1790 is guaranteed functional over the operating
temperature range of –40°C to 125°C. The LT1790-1.25 at 125°C is
typically less than 2% above the nominal voltage. The other voltage
options are typically less than 0.25% above their nominal voltage.
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.
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 3: If the part is stored outside of the specified temperature range, the
output voltage may shift due to hysteresis.
Note 4: ESD (Electrostatic Discharge) sensitive device. Extensive use of
ESD protection devices are used internal to the LT1790, however, high
electrostatic discharge can damage or degrade the device. Use proper ESD
handling precautions.
Note 7: Excludes load regulation errors.
Note 8: Peak-to-peak noise is measured with a single pole 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 seconds. Integrated RMS noise is measured from 10Hz to 1kHz
with the HP3561A analyzer.
1790fa
9
LT1790
ELECTRICAL CHARACTERISTICS
Note 9: Long-term drift typically has a logarithmic characteristic and
therefore changes after 1000 hours tend to be smaller than before that
time. Long-term drift is affected by differential stress between the IC and
the board material created during board assembly. See Applications
Information.
Note 10: Hysteresis in the 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 a successive measurements. Hysteresis is
roughly proportional to the square of the temperature change. Hysteresis
is not a problem for operational temperature excursions where the
instrument might be stored at high or low temperature. See Applications
Information.
U W
1.25V TYPICAL PERFOR A CE CHARACTERISTICS
Each of the voltage options have similar performance curves. For the 3V, 3.3V and the 4.096V options,
the curves can be estimated based on the 2.5V and 5V curves.
Minimum Input-Output Voltage
Differential (Sourcing)
Minimum Input-Output Voltage
Output Voltage Temperature Drift
Differential (Sinking)
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
10
1.253
1.252
1.251
1.250
1.249
1.248
1.247
FOUR TYPICAL PARTS
100µA
5mA
1mA
T
A
= 125°C
T
T
= –55°C
= 25°C
A
A
1
0.1
50 70
–50 –30 –10 10 30
TEMPERATURE (°C)
90
110 130
90 110
0.5
1
1.5
2
2.5
–50 –30 –10 10 30 50 70
0
TEMPERATURE (°C)
INPUT-OUTPUT VOLTAGE (V)
17901.25 G02
17091.25 G01
17091.25 G03
Load Regulation (Sourcing)
Load Regulation (Sinking)
Supply Current vs Input Voltage
100
90
80
70
60
50
40
30
20
10
0
2000
1800
1600
1400
1200
1000
800
0
–200
T
= –55°C
A
T
= –55°C
A
–400
T
= 25°C
T
= 25°C
A
A
–600
–800
T
= –55°C
= 125°C
1
T
= 125°C
A
A
–1000
–1200
–1400
–1600
–1800
–2000
T
= 125°C
A
600
T
A
400
T
A
= 25°C
200
0
0.1
10
0
5
10
INPUT VOLTAGE (V)
15
20
0.1
1
10
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
17901.25 G05
17901.25 G04
17901.25 G06
1790fa
10
LT1790
U W
1.25V TYPICAL PERFOR A CE CHARACTERISTICS
Each of the voltage options have similar performance curves. For the 3V, 3.3V and the 4.096V options,
the curves can be estimated based on the 2.5V and 5V curves.
Power Supply Rejection Ratio
vs Frequency
Line Regulation
Output Impedance vs Frequency
10
0
500
100
1.285
1.280
1.275
1.270
1.265
1.260
1.255
1.250
1.245
1.240
1.235
1.230
1.225
V
C
= 3V
V
= 3V
IN
L
IN
= 1µF
T
= 125°C
A
–10
–20
–30
–40
–50
–60
–70
–80
–90
C
= 0.47µF
L
10
1
C
= 4.7µF
L
T
= 25°C
A
C
= 1µF
L
T
A
= –55°C
0
100
100
1k
10k
100k
1M
0
2
4
6
8
10 12 14 16 18 20
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
INPUT VOLTAGE (V)
17901.25 G08
17901.25 G09
17901.25. G07
Long-Term Drift
(Data Points Reduced After 500 Hr)
–1.25V Characteristics
Output Noise 0.1Hz to 10Hz
0.30
0.25
140
120
100
80
LT1790S6-1.25V
R1 10k
3V
2 TYPICAL PARTS SOLDERED TO PCB
4
T
= 30°C
A
LT1790-1.25
6
1
2
V
OUT
0.20
0.15
R
L
1µF
60
5k
–V
EE
40
20
0.10
0.05
0
0
T
A
T
A
T
A
= 25°C
= 125°C
= –55°C
–20
–40
–60
–2.5
–2.0
–1.5
–1.0
–0.5
0
0
200
400
600
800
100
1000
0
1
2
3
4
5
6
7
8
9
10
OUTPUT TO GROUND VOLTAGE (V)
HOURS
TIME (SEC)
17091.25 G10
17901.25 G10
17901.2 G12
Output Voltage Noise Spectrum
Integrated Noise 10Hz to 1kHz
5.0
4.5
4.0
3.5
C
= 1µF
L
3.0
2.5
10
I
= 100µA
= 0µA
O
2.0
1.5
1.0
0.5
0
I
O
I
O
= 250µA
I
= 1mA
O
1
10
100
1000
10
100
1k
10k
FREQUENCY (Hz)
FREQUENCY (Hz)
LT1790 G01
17901.25 G13
1790fa
11
LT1790
W U
2.048V TYPICAL PERFOR A CE CHARACTERISTICS
Each of the voltage options have similar performance curves. For the 3V, 3.3V and the 4.096V options,
the curves can be estimated based on the 2.5V and 5V curves.
Minimum Input-Output Voltage
Differential (Sourcing)
Minimum Input-Output Voltage
Output Voltage Temperature Drift
Differential (Sinking)
2.056
2.054
2.052
2.050
2.048
2.046
2.044
2.042
130
110
90
10
FOUR TYPICAL PARTS
T
= 125°C
T
= 25°C
A
A
70
5mA
1mA
T
= –55°C
A
50
1
30
10
100µA
–10
–30
–50
0.1
–50 –30 –10 10 30 50
TEMPERATURE (°C)
130
70 90 110
–50 –30 –10 10
TEMPERATURE (°C)
90 110 130
0
0.1 0.2
INPUT-OUTPUT VOLTAGE (V)
0.7
30 50 70
0.3 0.4 0.5
0.6
17902.048 G01
17902.048 G03
17902.048 G02
Load Regulation (Sourcing)
Load Regulation (Sinking)
Supply Current vs Input Voltage
0
2000
1800
1600
1400
1200
1000
800
80
T
= –55°C
A
–200
–400
T
= –55°C
70
60
50
40
30
20
10
0
A
T
= 25°C
A
–600
T
= 125°C
A
T
= 25°C
–800
A
T
= –40°C
A
–1000
–1200
–1400
–1600
–1800
–2000
T
= 125°C
A
600
T
= 125°C
A
400
T
A
= 25°C
200
0
0.1
1
10
0.1
1
10
0
10
INPUT VOLTAGE (V)
20
5
15
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
17902.048 G04
17902.048 G05
17902.048 G06
Power Supply Rejection Ratio
vs Frequency
Line Regulation
Output Impedance vs Frequency
2.054
2.052
2.050
2.048
2.046
2.044
1000
100
10
20
10
C
L
= 1µF
T
T
= 125°C
= 25°C
A
0
C
L
= 0.47µF
–10
–20
–30
–40
–50
–60
–70
–80
A
T
= –55°C
A
C
= 4.7µF
= 1µF
L
C
L
2.042
1
0
2
4
6
8
10 12 14 16 18 20
10k
100k
1M
10M
100
1k
10k
100k
1M
FREQUENCY (Hz)
INPUT VOLTAGE (V)
FREQUENCY (Hz)
17902.048 G09
17902.048 G08
17902.048 G07
1790fa
12
LT1790
W U
2.048V TYPICAL PERFOR A CE CHARACTERISTICS
Each of the voltage options have similar performance curves. For the 3V, 3.3V and the 4.096V options,
the curves can be estimated based on the 2.5V and 5V curves.
–2.048V Characteristics
Long-Term Drift
0.30
0.25
100
R1 10k
3V
4
80
LT1790-2.048
6
60
40
20
0
1
2
V
OUT
0.20
0.15
R
L
1µF
5k
–V
EE
–20
0.10
0.05
0
T
T
T
= 125°C
= 25°C
A
A
A
–40
–60
= –55°C
–80
–100
–4 –3.5 –3 –2.5 –2 –1.5 –1 –0.5
OUTPUT TO GROUND VOLTAGE (V)
0
0
200
400
600
800
1000
HOURS
17092.048 G10
17901.048 G11
Output Noise 0.1Hz to 10Hz
Output Voltage Noise Spectrum
10
9
C
= 1µF
L
8
7
6
5
I
O
= 100µA
4
3
2
1
0
I
= 0µA
O
I
O
= 250µA
I
O
= 1mA
1k
10
100
10k
0
1
2
3
4
5
6
7
8
9
10
FREQUENCY (Hz)
TIME (SEC)
17902.048 G13
17902.048 G12
Integrated Noise 10Hz to 1kHz
100
10
1
10
100
1000
FREQUENCY (Hz)
LT1790 G02
1790fa
13
LT1790
U W
2.5V TYPICAL PERFOR A CE CHARACTERISTICS
Each of the voltage options have similar performance curves. For the 3V, 3.3V and the 4.096V options,
the curves can be estimated based on the 2.5V and 5V curves.
Minimum Input-Output Voltage
Differential (Sourcing)
Minimum Input-Output Voltage
Differential (Sinking)
Output Voltage Temperature Drift
2.508
2.506
2.504
2.502
2.500
2.498
2.496
2.494
90
70
10
FOUR TYPICAL PARTS
T
= –55°C
T = 125°C
A
A
50
T
= 25°C
A
30
10
1
100µA
1mA
5mA
–10
–30
0.1
50
TEMPERATURE (°C)
90
130
110
–50 –30 –10 10
30
70
90
110 130
–50 –30 –10 10 30 50 70
0
0.1
0.2
0.3
0.4
0.5
0.6
INPUT-OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
17902.5 G02
17902.5 G01
17902.5 G03
Load Regulation (Sourcing)
Load Regulation (Sinking)
Supply Current vs Input Voltage
2000
1800
1600
1400
1200
1000
800
80
70
60
50
40
30
20
10
0
0
–200
T
= 25°C
A
T
= –55°C
A
A
–400
T
= –55°C
A
–600
T
= 125°C
A
–800
T
= 25°C
–1000
–1200
–1400
–1600
–1800
–2000
T
= –55°C
A
T
= 125°C
A
600
400
T
= 125°C
A
200
T
A
= 25°C
0
10
0.1
1
10
0
5
15
20
0.1
1
10
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
INPUT VOLTAGE (V)
17902.5 G05
17902.5 G04
17902.5 G06
Power Supply Rejection Ratio
vs Frequency
Line Regulation
Output Impedance vs Frequency
2.515
2.510
2.505
2.500
2.495
2.490
1000
100
10
20
10
C
L
= 1µF
T
= 125°C
A
C
L
= 0.47µF
0
C
L
= 1µF
–10
–20
–30
–40
–50
–60
–70
–80
T
= 25°C
A
C
L
= 4.7µF
T
= –55°C
A
2.489
1
0
2
4
6
8
10 12 14 16 18 20
100
1k
10k
100k
100
1k
10k
100k
1M
FREQUENCY (Hz)
INPUT VOLTAGE (V)
FREQUENCY (Hz)
17902.5 G09
17902.5 G08
17902.5 G07
1790fa
14
LT1790
U W
2.5V TYPICAL PERFOR A CE CHARACTERISTICS
Each of the voltage options have similar performance curves. For the 3V, 3.3V and the 4.096V options,
the curves can be estimated based on the 2.5V and 5V curves.
Long-Term Drift
(Data Points Reduced After 500 Hr)
–2.5V Characteristics
140
120
100
80
0.30
0.25
0.20
0.15
0.10
0.05
0
R1 10k
3V
4
LT1790-2.5
1, 2
6
V
OUT
R
L
5k
1µF
60
–V
40
EE
20
0
T
T
T
= 25°C
= 125°C
= –55°C
A
A
A
–20
–40
–60
0
200
400
600
800
1000
–4.0 –3.5 –3.0 –2.5 –2.0 –1.5 –1.0 –0.5
OUTPUT TO GROUND VOLTAGE (V)
0
HOURS
17902.5 G11
17902.5 G10
Output Noise 0.1Hz to 10Hz
Output Voltage Noise Spectrum
10
8
C
L
= 1µF
I
O
= 0µA
6
I
= 250µA
O
4
I
O
= 1mA
2
0
10
100
FREQUENCY (Hz)
1k
10k
0
1
2
3
4
5
6
7
8
9
10
TIME (SEC)
1790 G05
17901.5 G12
Integrated Noise 10Hz to 1kHz
100
10
1
10
100
1000
FREQUENCY (Hz)
LT1790 G03
1790fa
15
LT1790
U W
5V TYPICAL PERFOR A CE CHARACTERISTICS
Each of the voltage options have similar performance curves. For the 3V, 3.3V and the 4.096V options,
the curves can be estimated based on the 2.5V and 5V curves.
Minimum Input-Output Voltage
Differential (Sourcing)
Minimum Input-Output Voltage
Differential (Sinking)
Output Voltage Temperature Drift
90
70
5.025
5.020
5.015
5.010
5.005
5.000
4.995
4.990
4.985
10
FOUR TYPICAL PARTS
50
T
= –55°C
A
100µA
T
A
= 125°C
A
30
T
= 25°C
1
1mA
10
–10
–30
–50
5mA
0.1
–50 –30 –10 10 30 50
TEMPERATURE (°C)
110 130
70 90
30 50
–50 –30 –10 10
70 90 110 130
0
0.1
0.2
0.3
0.4
0.5
0.6
INPUT-OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
17905 G02
17905 G03
17905 G01
Load Regulation (Sourcing)
Load Regulation (Sinking)
Supply Current vs Input Voltage
0
–200
2000
1800
1600
1400
1200
1000
800
80
70
60
50
40
30
20
10
0
T
A
= –55°C
T
= –55°C
= 25°C
A
–400
T
= 25°C
A
–600
T
A
T
= 125°C
A
–800
–1000
–1200
–1400
–1600
–1800
–2000
T
= –40°C
A
T
= 125°C
A
600
400
T
A
= 125°C
200
T
= 25°C
A
0
0.1
1
10
0.1
1
10
0
10
INPUT VOLTAGE (V)
20
5
15
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
17905 G04
17905 G05
17905 G06
Power Supply Rejection Ratio
vs Frequency
Line Regulation
Output Impedance vs Frequency
5.04
5.02
5.00
4.98
4.96
4.94
1000
100
10
20
10
C
L
= 1µF
T
T
= 125°C
= 25°C
A
0
C
L
= 0.47µF
A
–10
–20
–30
–40
–50
–60
–70
–80
C
L
= 1µF
T
= –55°C
A
C
L
= 4.7µF
4.92
1
0
2
4
6
8
10 12 14 16 18 20
100
1k
10k
100k
100
1k
10k
100k
1M
FREQUENCY (Hz)
INPUT VOLTAGE (V)
FREQUENCY (Hz)
17905 G09
17905 G08
17905 G07
1790fa
16
LT1790
U W
5V TYPICAL PERFOR A CE CHARACTERISTICS
Each of the voltage options have similar performance curves. For the 3V, 3.3V and the 4.096V options,
the curves can be estimated based on the 2.5V and 5V curves.
–5V Characteristics
Long-Term Drift
0.30
0.25
100
80
R1 10k
5.5V
4
LT1790-5
6
60
1
2
V
40
OUT
0.20
0.15
R
L
1µF
20
5k
–V
EE
0
–20
–40
–60
–80
–100
0.10
0.05
0
T
= 125°C
A
T
A
= 25°C
T
A
= –55°C
–10 –9 –8 –7 –6 –5 –4 –3 –2 –1
OUTPUT TO GROUND VOLTAGE (V)
0
0
200
400
600
800
1000
HOURS
17905 G10
17905 G11
Output Noise 0.1Hz to 10Hz
Output Voltage Noise Spectrum
10
8
C
L
= 1µF
I
O
= 0µA
6
I
O
= 250µA
4
I
O
= 1mA
2
0
0
1
2
3
4
5
6
7
8
9
10
10
100
FREQUENCY (Hz)
1k
10k
TIME (SEC)
1790 G05
17905 G12
Intergrated Noise 10Hz to 1kHz
1000
100
10
1
10
100
1000
FREQUENCY (Hz)
1790 G04
1790fa
17
LT1790
U
W U U
APPLICATIONS INFORMATION
Bypass and Load Capacitors
Figure 1 shows the turn-on time for the LT1790-2.5 with
a 1µF input bypass and 1µF load capacitor. Figure 2 shows
the output response to a 0.5V transient on VIN with the
same capacitors.
The LT1790 voltage references should have an input
bypass capacitor of 0.1µF or larger, however the bypass-
ing of other local devices may serve as the required
component. These references also require an output ca-
pacitor for stability. The optimum output capacitance for
most applications is 1µF, although larger values work as
well. This capacitor affects the turn-on and settling time
for the output to reach its final value.
The test circuit of Figure 3 is used to measure the stability
of various load currents. With RL = 1k, the 1V step
produces a current step of 1mA. Figure 4 shows the
response to a ±0.5mA load. Figure 5 is the output re-
sponse to a sourcing step from 4mA to 5mA, and Figure 6
is the output response of a sinking step from –4mA to
–5mA.
All LT1790 voltages perform virtually the same, so the
LT1790-2.5 is used as an example.
VGEN
3V
VIN
VOUT
3V
2V
2V
1V
0V
VOUT
(AC COUPLED)
1790 F04
1790 F01
Figure 4. LT1790-2.5 Sourcing and Sinking 0.5mA
Figure 1. Turn-On Characteristics of LT1790-2.5
VIN
3V
2V
1V
0V
VOUT
VOUT
(AC Coupled)
VGEN
–2V
–3V
1790 F05
1790 F02
Figure 5. LT1790-2.5 Sourcing 4mA to 5mA
Figure 2. Output Response to 0.5V Ripple on VIN
1k
4
6
V
IN
LT1790-2.5
1, 2
3V
C
C
L
1µF
IN
V
1V
GEN
0.1µF
1790 F03
Figure 3. Response Time Test Circuit
1790fa
18
LT1790
U
W U U
APPLICATIONS INFORMATION
VGEN
8V
stability during load transients. This connection main-
tains nearly the same accuracy and temperature coeffi-
cient of the positive connected LT1790.
6V
Long-Term Drift
VOUT
(AC Coupled)
4V
Long-term drift cannot be extrapolated from acceler-
ated high temperature testing. This erroneous tech-
niquegivesdriftnumbersthatarewidelyoptimistic.The
only way long-term drift can be determined is to mea-
sure it over the time interval of interest. The LT1790S6
drift data was taken on over 100 parts that were soldered
into PC boards similar to a “real world” application. The
boards were then placed into a constant temperature oven
with TA = 30°C, their outputs scanned regularly and
measured with an 8.5 digit DVM. Long-term drift curves
are shown in the Typical Performance Characteristics.
2V
0V
1790 F06
Figure 6. LT1790-2.5 Sinking –4mA to –5mA
Positive or Negative Operation
Series operation is ideal for extending battery life. If an
LT1790 is operated in series mode it does not require an
external current setting resistor. The specifications guar-
antee that the LT1790 family operates to 18V. When the
circuitry being regulated does not demand current, the
series connected LT1790 consumes only a few hundred
µW, yet the same connection can sink or source 5mA of
load current when demanded. A typical series connection
is shown on the front page of this data sheet.
Hysteresis
Hysteresis data shown in Figures 8 and 9 represent the
worst-case data taken on parts from 0°C to 70°C and from
–40°Cto85°C. Unitswerecycledseveraltimesoverthese
temperature ranges and the largest change is shown. As
expected, the parts cycled over the higher temperature
range have higher hysteresis than those cycled over the
lower range.
The circuit in Figure 7 shows the connection for a –2.5V
reference, although any LT1790 voltage option can be
configured this way to make a negative reference. The
LT1790 can be used as very stable negative references,
however, they require a positive voltage applied to Pin 4
to bias internal circuitry. This voltage must be current
limited with R1 to keep the output PNP transistor from
turning on and driving the grounded output. C1 provides
WhenanLT1790isIRreflowsolderedontoaPCboard,the
output shift is typically just 150ppm (0.015%).
Higher Input Voltage
The circuit in Figure 10 shows an easy way to increase the
input voltage range of the LT1790. The zener diode can be
anywhere from 6V to 18V. For equal power sharing be-
tween R1 and the zener (at 30V), the 18V option is better.
The circuit can tolerate much higher voltages for short
periods and is suitable for transient protection.
R1
10k
3V
4
6
C1
0.1µF
LT1790-2.5
Assuming 80µA max supply current for the LT1790, a
25µA load, 120mV max dropout and a 4V to 30V input
specification, the largest that R1 can be is (4V – 3.3V –
120mV)/(80µA + 25µA) = 5.5k. Furthermore, assuming
220mW of dissipation in the 18V SOT-23 zener, this gives
a max current of (220mW)/(18V) = 12.2mA. So the
smallest that R1 should be is (30V – 18V)/12.2mA = 1k,
1, 2
V
= –2.5V
OUT
V
– V
125µA
C
EE
OUT
L
R
L
=
1µF
V
EE
1790 F07
Figure 7. Using the LT1790-2.5 to Build a –2.5V Reference
rated at 150mW.
1790fa
19
LT1790
U
W U U
APPLICATIONS INFORMATION
8
16
14
12
10
8
7
0°C TO 25°C
6
5
70°C TO 25°C
85°C TO 25°C
–40°C TO 25°C
4
6
3
2
1
0
4
2
0
–240
–200
–160
–120
–80
–40
0
40
80
–80 –70 –60 –50 –40 –30 –20 –10
0
10 20 30 40 50
DISTRIBUTION (ppm)
DISTRIBUTION (ppm)
1790 F09
1790 F08
Figure 8. Worst-Case 0°C to 70°C Hysteresis on 30 Units
Figure 9. Worst-Case –40°C to 85°C Hysteresis on 30 Units
the transition region. The no load standing current is only
120µA, yet the output can deliver over 300mA.
4V TO 30V
R1
Noise
V
LT1790-3.3
OUT
C1
BZX84C18
1µF
Anestimateofthetotalintegratednoisefrom10Hzto1kHz
can be made by multiplying the flat band spot noise by
√BW. For example, from the Typical Performance Curves,
the LT1790-1.25 noise spectrum shows the average spot
noise to be about 450nV/√Hz. The square root of the
bandwidth is √990 = 31.4. The total noise 10Hz to 1kHz
noise is (450nV)(31.4) = 14.1µV. This agrees well with the
measured noise.
0.1µF
1790 F10
Figure 10. Extended Supply Range Reference
WithR1=1k,andassuminga450mVworst-casedropout,
the LT1790 can deliver a minimum current of (4V – 3.3V–
450mV)/(1k) = 250µA. In Figure 10, R1 and C1 provide
filtering of the zener noise when the zener is in its noisy V-I
knee.
This estimate may not be as good with higher voltage
options, there are several reasons for this. Higher voltage
options have higher noise and they have higher variability
due to process variations. 10Hz to 1kHz noise may vary by
2dB on the LT1790-5 and 1dB on the LT1790-2.5.
Thereareothervariationsforhighervoltageoperationthat
use a pass transistor shown in Figures 11 and 12. These
circuits allow the input voltage to be as high as 160V while
maintaining low supply current.
Measured noise may also vary because of peaking in the
noise spectrum. This effect can be seen in the range of
1kHz to 10kHz with all voltage options sourcing different
load currents. From the Typical Performance Curves the
10Hz to 1kHz noise spectrum of the LT1790-5 is shown to
be 3µV/√Hz at low frequency. The estimated noise is
(3µV)(31.4) = 93.4µV. The actual integrated 10Hz to 1kHz
noise measures 118.3µV. The peaking shown causes this
largernumber. Peakingisafunctionofoutputcapacitoras
well as load current and process variations.
More Output Current
The circuit in Figure 13 is a compact, high output current,
lowdropoutprecisionsupply. ThecircuitusestheSOT-23
LT1782andtheThinSOTLT1790.ResistivedividerR1and
R2 set a voltage 22mV below VS. For under 1mA of output
current, the LT1790 supplies the load. Above 1mA of load
current, the (+) input of the LT1782 is pulled below the
22mV divider reference and the output FET turns on to
supply the load current. Capacitor C1 stops oscillations in
1790fa
20
LT1790
U
W U U
APPLICATIONS INFORMATION
V
S
V
S
6V TO 160V
6.5V TO 160V
R1
330k
C1
0.1µF
R2
4.7k
R1
330k
ON SEMI
ON SEMI
MMBT5551
MMBT5551
BZX84C12
C1
0.1µF
LT1790
V
OUT
BAV99
C2
1µF
V
LT1790
OUT
C2
1µF
1790 F11
1790 F12
Figure 11. Extended Supply Range Reference
Figure 12. Extended Supply Range Reference
V
S
2.8V TO 3.3V
NO LOAD
SUPPLY CURRENT
120µA
R3
22Ω
R4
1k
5%
5%
R1
+
–
680Ω
5%
VISHAY SILICONIX
Si3445DV
LT1782
C1
0.1µF
R2
100k
5%
V
I
= 2.5V
= 0mA to 300mA
OUT
LOAD
LT1790-2.5
17909 F13
C2
1µF
NOTE: NOT CURRENT LIMITED
Figure 13. Compact, High Output Current, Low Dropout, Precison 2.5V Supply
1790fa
21
LT1790
W
W
SI PLIFIED SCHE ATIC
V
V
4
6
IN
OUT
GND
1, 2
1790 SS
1790fa
22
LT1790
U
PACKAGE DESCRIPTIO
S6 Package
6-Lead Plastic SOT-23
(Reference LTC DWG # 05-08-1636)
2.80 – 3.10
(.110 – .118)
(NOTE 3)
SOT-23
(Original)
SOT-23
(ThinSOT)
.90 – 1.45
1.00 MAX
A
A1
A2
L
(.035 – .057)
(.039 MAX)
.00 – 0.15
(.00 – .006)
.01 – .10
(.0004 – .004)
2.60 – 3.00
1.50 – 1.75
(.102 – .118) (.059 – .069)
(NOTE 3)
.90 – 1.30
(.035 – .051)
.80 – .90
(.031 – .035)
PIN ONE ID
.35 – .55
(.014 – .021)
.30 – .50 REF
(.012 – .019 REF)
.95
(.037)
REF
.25 – .50
(.010 – .020)
(6PLCS, NOTE 2)
.20
(.008)
A2
A
DATUM ‘A’
1.90
(.074)
REF
L
.09 – .20
(.004 – .008)
(NOTE 2)
A1
S6 SOT-23 0401
NOTE:
1. CONTROLLING DIMENSION: MILLIMETERS
MILLIMETERS
2. DIMENSIONS ARE IN
(INCHES)
3. DRAWING NOT TO SCALE
4. DIMENSIONS ARE INCLUSIVE OF PLATING
5. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
6. MOLD FLASH SHALL NOT EXCEED .254mm
7. PACKAGE EIAJ REFERENCE IS:
SC-74A (EIAJ) FOR ORIGINAL
JEDEC MO-193 FOR THIN
1790fa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
23
LT1790
U
TYPICAL APPLICATIO
–2.5V Negative 50mA Series Reference
No Load Supply Current
I
CC = 1.6mA
IEE = 440µA
V
= 5V
CC
2k
4
6
LT1790-2.5
1, 2
V
= 5.1V
Z
5.1k
–2.5V
50mA
V
= –5V
EE
MPS2907A
1µF
1790 TA03
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1019
Precision Reference
Low Noise Bandgap, 0.05%, 5ppm/°C
LTC®1798
LT1460
Micropower Low Dropout Reference
Micropower Precison Series Reference
Micropower Precision Low Dropout Reference
0.15% Max, 6.5µA Supply Current
Bandgap, 130µA Supply Current, 10ppm/°C, Available in SOT-23
Bandgap 0.04%, 3ppm/°C, 50µA Max Supply Current
LT1461
1790fa
LT/CPI 0202 1.5K REV A • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
24
●
●
LINEAR TECHNOLOGY CORPORATION 2000
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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