MAX6012AEUR-T View Datasheet(PDF) - Maxim Integrated

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Description

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MAX6012AEUR-T

Precision, Low-Power, Low-Dropout, SOT23-3 Voltage References

Maxim Integrated 

Precision, Low-Power, Low-Dropout,

SOT23-3 Voltage References

Pin Description

PIN

NAME

FUNCTION

1

IN

Supply Voltage Input

2

OUT

Reference Voltage Output

3

GND

Ground

Detailed Description

The MAX6012/MAX6021/MAX6025/MAX6030/MAX6041/

MAX6045/MAX6050 precision bandgap references use

a proprietary curvature-correction circuit and laser-

trimmed thin-film resistors, resulting in a low tempera-

ture coefficient of <20ppm/°C and initial accuracy of

better than 0.2%. These devices can sink and source

up to 500µA with <200mV of dropout voltage, making

them attractive for use in low-voltage applications.

Applications Information

Output/Load Capacitance

Devices in this family do not require an output capaci-

tance for frequency stability. They are stable for capac-

itive loads from 0 to 2.2nF. However, in applications

where the load or the supply can experience step

changes, an output capacitor will reduce the amount of

overshoot (or undershoot) and assist the circuit’s tran-

sient response. Many applications do not need an

external capacitor, and this family can offer a signifi-

cant advantage in these applications when board

space is critical.

Supply Current

The quiescent supply current of these series-mode ref-

erences is a maximum of 35µA and is virtually indepen-

dent of the supply voltage, with only a 0.8µA/V variation

with supply voltage. Unlike series references, shunt-

mode references operate with a series resistor con-

nected to the power supply. The quiescent current of a

shunt-mode reference is thus a function of the input

voltage. Additionally, shunt-mode references have to

be biased at the maximum expected load current, even

if the load current is not present all the time. The load

current is drawn from the input voltage only when

required, so supply current is not wasted and efficiency

is maximized at all input voltages. This improved effi-

ciency can help reduce power dissipation and extend

battery life.

When the supply voltage is below the minimum speci-

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

draw up to 200µA 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

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 temperature hysteresis value is 130ppm.

VS

+2VS

VCC

V+

MAX681

GND

V-

IN OUT

MAX6012

MAX6021

1MΩ

MAX6025

0.1%

MAX6030

MAX6041

MAX6045

MAX6050

GND

1MΩ

0.1%

-2VS

+REF OUTPUT

V+

ICL7652

V-

10nF

OUTPUT

-REF OUTPUT

Figure 1. Positive and Negative References from Single +3V or +5V Supply

12 ______________________________________________________________________________________

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