LT1431CN8 Linear Technology, LT1431CN8 Datasheet - Page 6

• Manufacturer Part Number: LT1431CN8
• Description: IC REF PROGRAMMABLE .4%TOL 8-DIP
• Manufacturer: Linear Technology

Specifications of LT1431CN8

• Reference Type: Shunt, Adjustable
• Voltage - Output: 2.5 ~ 36 V
• Tolerance: ±0.4%
• Temperature Coefficient: 30ppm/°C
• Number Of Channels: 1
• Current - Cathode: 600µA
• Current - Output: 100mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Input: -
• Current - Quiescent: -

pin FuncTions
LT1431
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
The maximum input voltage is 36V and the minimum to
operate is equal to V
typically 0.6mA.
R
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.
block DiagraM

TOP
+
(Pin 3): Bias voltage for the entire shunt regulator.
(Pin 4): Top of the on-chip 5k-5k resistive divider
REF
(2.5V). The quiescent current is
R
REF
MID
8
7
R
TOP
4
5k
5k
GND-SENSE
5
2.5V
+
–
4mA/V
g
m
V
=
+
3
R
between R
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
reduces I
COMP , R
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
below R
(except for GND-S).
The following pin definitions apply to the Z package.
CATHODE: Corresponds to COLL and V
ANODE: Corresponds to GND-S and GND-F tied together.
REF: Corresponds to REF .
MID
COMP
(Pin 7): Middle of the on-chip resistive divider string
2
MID
TOP
B
TOP
to 0.2µA typical.
, R
in voltage and any pin below GND-F in voltage
COLLECTOR
MID
GND-FORCE
and GND-S. The pin is tied to REF for self-
, and REF have static discharge protection
1
6
+
> 3V, input bias current cancellation
LT1431 BD
+
tied together.
1431fd
TOP