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LT6656_1 Datasheet, PDF (6/18 Pages) Linear Technology – 1μA Precision Series Voltage Reference
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LT6656
Typical Performance Characteristics
Supply Current vs Input Voltage
100
2.048V TO 5V OPTIONS
TA = 125°C
TA = 85°C
TA = 25°C
TA = –55°C
10
VON
1
0.1
0
2.5V OPTION SHOWN
VON MOVES WITH VOLTAGE OPTION
2 4 6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
6656 G03
Minimum Supply Voltage
vs Load Current
2.0
1.25V OPTION
INITIAL VIN = 2.2V
1.8 ∆VOUT = 0.1%
1.6
1.4
1.2
1.0
0.8
0.1µ
TA = 125°C
TA = 85°C
TA = 25°C
TA = –40°C
TA = –55°C
1µ
10µ 100µ 1m 10m
LOAD CURRENT (A)
6656 G18
Dropout Voltage vs Load Current
1000
2.048V TO 5V OPTIONS
VIN – VOUT
INITIAL VIN = VOUT + 0.5V
∆VOUT = 0.1%
100
10
1
0.1µ
TA = 125°C
TA = 85°C
TA = 25°C
TA = –55°C
1µ
10µ 100µ 1m 10m
LOAD CURRENT (A)
6656 G04
Load Regulation (Sourcing)
500
1.25V OPTION
VIN = 1.75V
250 CL = 1µF
0
–250
–500
–750
–1000
0.1µ
TA = 125°C
TA = 85°C
TA = 25°C
TA = –40°C
TA = –55°C
1µ
10µ 100µ 1m 10m
LOAD CURRENT (A)
6656 G19
Load Regulation (Sourcing)
750
2.048V TO 5V OPTIONS
VIN = VOUT + 0.5V
500 CL = 1µF
250
0
–250
–500
–750
0.1µ
TA = 125°C
TA = 85°C
TA = 25°C
TA = –55°C
1µ
10µ 100µ 1m 10m
LOAD CURRENT (A)
6656 G05
Line Regulation
1000
900
800
700
600
500
400
300
ALL OPTIONS
IL = 0
CL = 1µF
2.5V OPTION SHOWN
VON MOVES WITH
VOLTAGE OPTION
VON
TA = 125°C
TA = 85°C
TA = 25°C
TA = –55°C
200
100
0
–100
–200
0 2 4 6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
6656 G08
Power Supply Rejection Ratio
vs Frequency
90
VIN = VOUT + 0.5V
80
CL = 1µF
IL = 0
70
60
50
40
30
20
10
0
10
1.25V OPTION
2.5V OPTION
5V OPTION
100
1k
FREQUENCY (Hz)
10k
6656 G09

Load Regulation (Sinking)
5.0
ALL OPTIONS
4.5 VIN = VOUT + 0.5V
4.0 CL = 1µF
3.5
3.0
TA = 85°C, 125°C
2.5
TA = 25°C
2.0
TA = –40°C
TA = –55°C
1.5
1.0
0.5
0
–0.5
10µ
100µ
LOAD CURRENT (A)
1m
6656 G06
Power Supply Rejection Ratio
vs Frequency
90
2.5V OPTION
80
VIN = 3V
70
60
50
40
30
20
10
0
–10
10
IL = 0, CL = 1µF
IL = 0, CL = 10µF
IL = 1mA, CL = 1µF
IL = 1mA, CL = 10µF
100
1k
FREQUENCY (Hz)
10k
6656 G20
6656fa
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