11.2.1.2.4 Shutdown/Enable Feature

The REF34-Q1 references can be switched to a low power shut-down mode when a voltage of 0.5 V or lower is

input to the ENABLE pin. Likewise, the reference becomes operational for ENABLE voltages of 1.6 V or higher.

During shutdown, the supply current drops to less than 2 μA, useful in applications that are sensitive to power

consumption.

If using the shutdown feature, ensure that the ENABLE pin voltage does not fall between 0.5 V and 1.6 V

because this causes a large increase in the supply current of the device and may keep the reference from

starting up correctly. If not using the shutdown feature, however, the ENABLE pin can simply be tied to the IN

pin, and the reference remains operational continuously.

11.2.1.3 Application Curves

Temperature (°C)

-50

-25

0

25

50

75

100

125

71

71.5

72

72.5

73

73.5

74

74.5

75

D004

Figure 11-2. Quiescent Current vs Temperature

Temperature (°C)

-40

-15

10

35

60

85

110 125

2

2.1

2.2

2.3

2.4

2.5

2.6

D013

Figure 11-3. Quiescent Current Shutdown Mode

REF34-Q1

SBAS901C – JULY 2018 – REVISED OCTOBER 2020

www.ti.com

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