Precision, Micropower, 1.8V Supply,

Low-Dropout, SOT23 Voltage Reference

8

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Detailed Description

The MAX6018 is a precision, low-voltage, low-dropout,

micropower, bandgap voltage reference in a SOT23

package. This three-terminal reference operates with

available with output voltage options of 1.2V, 1.6V,

1.8V, and 2.048V. These devices can source up to 1mA

with <200mV of dropout voltage, making them attrac-

tive for use in low-voltage applications.

Applications Information

Output/Load Capacitance

These devices require a minimum of 100pF load to

maintain output stability.

They remain stable for capacitive loads as high as 1µF.

In applications where the load or the supply can experi-

ence step changes, a larger output capacitor reduces

the amount of overshoot (or undershoot) and assists

the circuit’s transient response. Otherwise, applications

may not need more than 100pF.

Supply Current

The 5µA maximum supply current varies only 0.1µA/V

with the supply voltage.

When the supply voltage is below the minimum-speci-

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

draw up to 20µA beyond the nominal supply current.

The input voltage source must be capable of providing

this current to ensure reliable turn-on.

Turn-On Time

These devices typically turn on and settle to within

0.1% of their final value in 200µs. The turn-on time can

increase up to 1ms with the device operating at the

minimum dropout voltage and the maximum load.

Chip Information

TRANSISTOR COUNT: 87

PROCESS: BiCMOS

PIN

NAME

FUNCTION

1IN

Supply Voltage Input. Bypass with a 0.1µF

capacitor to ground.

2

OUT

Reference Voltage Output. Bypass with at

least 100pF to ground. (See Output/Load

Capacitance section).

3

GND

Ground

Pin Description

1mA/div

+1mA

-1mA

1V/div

MAX6018_21

LOAD-TRANSIENT RESPONSE

MAX6018 toc19

100

µs/div

MAX6018_12

LINE-TRANSIENT RESPONSE

MAX6018 toc20

50mV/div

200mV/div

100

µs/div

200mV/div

50mV/div

MAX6018_21

LINE-TRANSIENT RESPONSE

MAX6018 toc21

100

µs/div

Typical Operating Characteristics (continued)