MAX6143
High-Precision Voltage Reference with
Temperature Sensor
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Temp Output
The MAX6143 provides a temperature output proportional to die temperature. TEMP can be calculated from
the following formula:
TEMP (V) = TJ(°K) x n
where TJ= the die temperature,
n = the temperature multiplier,
TA= the ambient temperature.
Self-heating affects the die temperature and converse-
ly, the TEMP output. The TEMP equation assumes the
output is not loaded. If device power dissipation is negligible, then TJ≈ TA.
Applications Information
Bypassing/Output Capacitance
For the best line-transient performance, decouple the
input with a 0.1µF ceramic capacitor as shown in the
Typical Operating Circuit. Place the capacitor as close
to IN as possible. When transient performance is less
important, no capacitor is necessary.
The MAX6143 does not require an output capacitor for
stability and is stable with capacitive loads up to 100µF.
In applications where the load or the supply can experience step changes, a larger output capacitor reduces
the amount of overshoot (undershoot) and improves the
circuit’s transient response. Place output capacitors as
close to the device as possible for best performance.
Supply Current
The MAX6143 consumes 340µA of quiescent supply
current. This improved efficiency reduces power dissipation and extends battery life.
Shutdown
The active-low shutdown feature reduces supply current to 0.01µA (typ), further extending battery life.
Connect SHDN to GND to activate shutdown. Connect
SHDN to IN for normal operation.
Thermal Hysteresis
Thermal hysteresis is the change in the output voltage
at TA= +25°C before and after the device is cycled
over its entire operating temperature range. Hysteresis
is caused by differential package stress appearing
across the bandgap core transistors. The typical thermal hysteresis value is 120ppm.
Turn-On Time
The MAX6143 typically turns on and settles to within
0.1% of the preset output voltage in 150µs (2.5V
output). The turn-on time can increase up to 150µs with
the device operating at a 1µF load.
Short-Circuited Outputs
The MAX6143 features a short-circuit-protected output.
Internal circuitry limits the output current to 60mA when
short circuiting the output to ground. The output current is limited to 3mA when short circuiting the output
to the input.