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 MAX6033 family requires a minimum output capac-

itance of 0.1µF for stability and is stable with capacitive

loads (including the bypass capacitance) of 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.

Supply Current

The quiescent supply current of the MAX6033 series

reference is typically 40µA and is virtually independent

of the supply voltage. In the MAX6033 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.

Output-Voltage Hysteresis

Output voltage hysteresis is the change in the output

cycled over its entire operating temperature range.

Hysteresis is caused by differential package stress

appearing across the bandgap core transistors. The

typical temperature hysteresis value is 150ppm.

Turn-On Time

These devices typically turn on and settle to within

0.01% of their final value in >1µs. The turn-on time can

increase up to 2ms with the device operating at the

minimum dropout voltage and the maximum load.

Precision Current Source

Figure 1 shows a typical circuit providing a precision

current source. The OUTF output provides the bias cur-

rent for the bipolar transistor. OUTS senses the voltage

across the resistor and adjusts the current sourced by

OUTF accordingly.

High-Resolution DAC and

Reference from Single Supply

Figure 2 shows a typical circuit providing both the

power supply and reference for a high-resolution DAC.

A MAX6033 with 2.5V output provides the reference

voltage for the DAC.

Ultra-High-Precision SOT23 Series

Voltage Reference

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9

Pin Description

PIN

NAME

FUNCTION

1, 3

I.C.

Internally Connected. Do not

connect externally.

2

GND

Ground

4

IN

Positive Power-Supply Input

5

OUTF

Voltage Reference Force Output.

Short OUTF to OUTS as close to

the device as possible. Bypass

OUTF with 0.1µF (min) capacitor

to GND.

6

OUTS

Voltage Reference Sense

OUTS

OUTF

MAX6033

IN

GND

Figure 1. Precision Current Source

OUT

OUT

REF

3V SUPPLY

IN

GND

ANALOG

OUTPUT

MAX6033

GND

MAX5143

DAC

Figure 2. 14-Bit High-Resolution DAC and Positive Reference

from a Single 3V Supply