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LT1431MJ8

P1-P3P4-P6P7-P9P10-P12P13-P14
LT1431
4
1431fe
Typical perForMance characTerisTics
V
REF
and I
REF
vs Temperature
I
LIMIT
vs Temperature with
External Resistor
COLLECTOR V
SAT
vs
Temperature vs Current
Propagation Delay vs Overdrive
Voltage Gain and Phase
vs Frequency
Transconductance and Phase
vs Frequency (REF to COLL)
2.5V Reference I
K
vs V
KA
V
REF
and I
REF
vs V
+
V
REF
and I
REF
vs V
+
V
KA
(V)
0
I
K
(µA)
600
800
1000
4.0
LT1431 TPC01
400
200
0
1.0
2.0
3.0
5.0
I
MIN
500
700
900
300
100
0.5 4.5
1.5
2.5
3.5
V
+
(V)
2.5
V
REF
(V)
2.501
2.503
3.3
LT1431 TPC02
2.499
2.497
2.495
2.7 2.9 3.1 3.5
REF
1.5
2.5
0.5
–0.5
–1.5
V
REF
I
REF
2.500
2.502
2.504
2.498
2.496
3.22.6 2.8 3.0 3.4
1.0
2.0
3.0
0
–1.0
V
+
(V)
0
V
REF
(V)
2.501
2.503
2.505
32
LT1431 TPC03
2.499
2.497
2.495
8
16
24
40
I
REF
(µA)
1.5
2.5
3.5
0.5
–0.5
–1.5
V
REF
I
REF
2.500
2.502
2.504
2.498
2.496
28
4
12
20
36
1.0
2.0
3.0
0
–1.0
TEMPERATURE (°C)
–50
V
REF
(V)
2.4975
2.5000
2.5025
25 75
LT1431 TPC04
2.4950
2.4925
–25 0
50 100 125
2.4900
2.4875
0.33
0.66
1.00
0
–0.33
–0.66
–1.00
I
REF
(µA)
V
REF
I
REF
TEMPERATURE (°C)
–50
I
LIMIT
(NORMALIZED)
1.000
1.125
1.250
25 75
LT1431 TPC05
0.875
0.750
–25 0
50 100 125
0.625
0.500
I
LIMIT
=
0.7
R
LIM
+ 3.6
AT 25°C
TEMPERATURE (°C)
–50
V
SAT
(V)
0.80
1.00
1.20
25 75
LT1431 TPC06
0.60
0.40
–25 0
50 100 125
0.20
0
I
COLL
= 100mA
I
COLL
= 20mA
I
COLL
= 10mA
I
COLL
= 50mA
OVERDRIVE (mV)
0
PROPAGATION DELAY (µs)
90
120
150
200
LT1431 TPC07
60
30
0
50
100
150
250
75
105
135
45
15
3 1
1k
OUTPUT
5 6
5V
LT1431
V
REF
± OVERDRIVE
OUTPUT HIGH-TO-LOW
OUTPUT LOW-TO-HIGH
FREQUENCY (Hz)
20
REF-TO-COLL 1k LOAD A
V
(dB)
40
80
120
140
100 10k 100k 10M
LT1431 TPC08
0
1k
1M
100
60
–20
–90
–45
45
135
180
–135
90
0
–180
PHASE (DEG)
PHASE
A
V
FREQUENCY (Hz)
10
10
100 10k 100k 10M
LT1431 TPC09
1k 1M
–90
–45
45
135
180
–135
90
0
–180
PHASE (DEG)
10
9
10
8
10
7
10
6
10
5
10
4
10
3
10
2
REF-TO-COLL g
m
(µ )
Ω
PHASE
g
m
LT1431
5
1431fe
Typical perForMance characTerisTics
I
COMP
vs V
COMP
vs V
REF
Noise vs Frequency 0.1Hz to 10Hz Noise
Transconductance and Phase
vs Frequency (Ref to Comp) Dynamic Impedance vs Frequency V
COMP
vs Temperature vs I
COLL
FREQUENCY (Hz)
10
4
100 10k 100k 10M
LT1431 TPC10
1k 1M
–100
–80
–40
0
20
–120
–20
–60
–140
PHASE (DEG)
3 × 10
3
10
3
0.1
REF-TO-COLL g
m
(µ )
Ω
PHASE
g
m
3 × 10
2
FREQUENCY (Hz)
100
0.8
1.0
1.2
1.4
1k 10k 100k
LT1431 TPC11
0.6
0.4
0.2
0
I
K
≤ 100mA
Z
KA
(Ω)
TEMPERATURE (°C)
–50
V
COMP
(V)
2.0
2.5
3.0
25 75
LT1431 TPC12
1.5
1.0
–25 0
50 100 125
0.5
0
I
COLL
= 100mA
I
COLL
= 10mA
V
COMP
(V)
0
I
COMP
(µA)
400
500
600
1.5 2.5
LT1431 TPC13
300
200
0.5 1.0
2.0 3.0 3.5
100
0
V
REF
= 5V
V
REF
= 4V
V
REF
= 3V
V
REF
= 2.53V
FREQUENCY (Hz)
NOISE (nV/√Hz)
1000
1 100 1k 100k
LT1431 G14
10 10k
500
0
TIME (MINUTES)
0 3 5
LT1431 TPC15
1 2
4 6
NOISE VOLTAGE (50µV/DIV)
LT1431
6
1431fe
block DiagraM
pin FuncTions
COLL (Pin 1): Open collector of the output transistor. The
maximum pin voltage is 36V. The saturation voltage at
100mA is approximately 1V.
COMP (Pin 2): Base of the driver for the output transis-
tor. This pin allows additional compensation for complex
feedback systems and shutdown of the regulator. It must
be left open if unused.
V
+
(Pin 3): Bias voltage for the entire shunt regulator.
The maximum input voltage is 36V and the minimum to
operate is equal to V
REF
(2.5V). The quiescent current is
typically 0.6mA.
R
TOP
(Pin 4): Top of the on-chip 5k-5k resistive divider
that guarantees 1% accuracy of operation as a 5V shunt
regulator with no external trim. The pin is tied to COLL for
self-contained 5V operation. It may be left open if unused.
See note on parasitic diodes below.
GND-S (Pin 5): Ground reference for the on-chip resis-
tive divider and shunt regulator circuitry except for the
output transistor. This pin allows external current limit
of the output transistor with one resistor between GND-F
(force) and GND-S (sense).
GND-F (Pin 6): Emitter of the output transistor and sub-
strate connection for the die.
R
MID
(Pin 7): Middle of the on-chip resistive divider string
between R
TOP
and GND-S. The pin is tied to REF for self-
contained 5V operation. It may be left open if unused.
REF (Pin 8): Control pin of the shunt regulator with a
2.5V threshold. If V
+
> 3V, input bias current cancellation
reduces I
B
to 0.2µA typical.
COMP, R
TOP
, R
MID
, and REF have static discharge protection
circuits that must not be activated on a continuous basis.
Therefore, the absolute maximum DC voltage on these
pins is 6V, well beyond the normal operating conditions.
As with all bipolar ICs, the LT1431 contains parasitic diodes
which must not be forward biased or else anomalous
behavior will result. Pin conditions to be avoided are R
TOP
below R
MID
in voltage and any pin below GND-F in voltage
(except for GND-S).
The following pin definitions apply to the Z package.
CATHODE: Corresponds to COLL and V
+
tied together.
ANODE: Corresponds to GND-S and GND-F tied together.
REF: Corresponds to REF.
LT1431 BD
COMPV
+
GND-FORCE
GND-SENSE
R
TOP
REF
R
MID
2.5V
+
–
g
m
=
4mA/V
5k
COLLECTOR
8
7
5
4 3 2 1
6
5k
P1-P3P4-P6P7-P9P10-P12P13-P14

LT1431MJ8

Mfr. #:
Buy LT1431MJ8
Manufacturer:
Analog Devices / Linear Technology
Description:
Voltage References LT1431 - Programmable Reference
Lifecycle:
New from this manufacturer.
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