Datasheet
Detailed Description
The MAX6143 precision voltage reference provides
accurate preset +2.5V, +3.3V, +4.096V, +5.0V, and
+10V reference voltages from up to +40V input voltages.
These devices feature a proprietary temperature-coeffi-
cient curvature-correction circuit and laser-trimmed thin-
film resistors that result in a very low 3ppm/°C
temperature coefficient and excellent 0.05% initial accu-
racy. The MAX6143 draws 340µA of supply current and
sources 30mA or sinks 2mA of load current.
Trimming the Output Voltage
Trim the factory-preset output voltage on the MAX6143
by placing a resistive-divider network between OUT,
TRIM, and GND. Use the following formula to calculate
the change in output voltage from its preset value:
∆V
OUT
= 2 x (V
TRIM
- V
TRIM (open)
) x k
where:
V
TRIM
= 0 to V
OUT
V
TRIM
(open)
= V
OUT
(nominal) / 2 (typ)
k = ±6% typ
For example, use a 50kΩ potentiometer (such as the
MAX5436) between OUT, TRIM, and GND with the
potentiometer wiper connected to TRIM (see Figure 2).
As the TRIM voltage changes from V
OUT
to GND, the
output voltage changes accordingly. Set R2 to 1MΩ or
less. Currents through resistors R1 and R2 add to the
quiescent supply current.
Typical Operating Characteristics (continued)
(V
IN
= +5V for V
OUT
= +2.5V, V
IN
= +15V for V
OUT
= +10V, I
OUT
= 0, T
A
= +25°C, unless otherwise noted.)
SHUTDOWN TRANSIENT
(V
OUT
= 10V, V
IN
= 15V, C
OUT
= 0)
MAX6413toc45
V
SHDN
5V/div
V
OUT
5V/div
GND
GND
100µs/div
SHUTDOWN TRANSIENT
(V
OUT
= 10V, V
IN
= 15V, C
OUT
= 1µF)
MAX6143toc46
V
SHDN
5V/div
V
OUT
5V/div
GND
GND
100µs/div
MAX6143
High-Precision Voltage Reference with
Temperature Sensor
______________________________________________________________________________________ 13
PIN NAME FUNCTION
1, 8 I.C. Internally Connected. Do not connect externally.
2INPositive Power-Supply Input
3 TEMP
Temperature Proportional Output Voltage. TEMP generates an output voltage proportional to the die
temperature.
4 GND Ground
5 TRIM
Output Voltage Trim. Connect TRIM to the center of a voltage-divider between OUT and GND for
trimming. Leave unconnected to use the preset output voltage.
6 OUT Output Voltage
7 SHDN Active-Low Shutdown. Connect SHDN to IN for normal operation.
Pin Description