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MAX6133AASA50

3ppm/°C, Low-Power, Low-Dropout Voltage Reference

Maxim Integrated 

3ppm/°C, Low-Power, Low-Dropout

Voltage Reference

PIN

1, 3, 7

2

4

5, 8

6

NAME

N.C.

IN

GND

I.C.

OUT

Pin Description

FUNCTION

No Connection. Not connected internally. Leave unconnected or connect to GND.

Positive Power-Supply Input

Ground

Internally Connected. Do not connect externally.

Reference Output Voltage. Connect a 0.1µF minimum capacitor to GND.

Applications Information

Bypassing/Load 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 MAX6133

family requires a minimum output capacitance of 0.1µF

for stability and is stable with capacitive loads (includ-

ing the bypass capacitance) of up to 100µF. In applica-

tions 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.

Supply Current

The quiescent supply current of the MAX6133 series

reference is typically 40µA and is virtually independent

of the supply voltage. In the MAX6133 family, the load

current is drawn from the input only when required, so

supply current is not wasted and efficiency is maxi-

mized at all input voltages. This improved efficiency

reduces power dissipation and extends battery life.

When the supply voltage is below the minimum-speci-

fied input voltage (as during turn-on), the devices can

draw up to 150µA beyond the nominal supply current.

The input voltage source must be capable of providing

this current to ensure reliable turn-on.

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 ther-

mal hysteresis value is 120ppm for both SO and µMAX

packages.

Turn-On Time

These devices typically turn on and settle to within

0.01% of their final value in <1ms. The turn-on time can

increase up to 2ms with the device operating at the

minimum dropout voltage and the maximum load.

Low-Power, 14-Bit DAC

with MAX6133 as a Reference

Figure 1 shows a typical application circuit for the

MAX6133 providing both the power supply and precision

reference voltage for a 14-bit high-resolution, serial-

input, voltage-output digital-to-analog converter. The

MAX6133 with a 2.5V output provides the reference volt-

age for the DAC.

3V SUPPLY

IN

VDD

MAX6133

2.5V

MAX5143

OUT

REF

GND

GND

ANALOG

OUTPUT

Figure 1. 14-Bit High-Resolution DAC and Positive Reference

From a Single 3V Supply

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