Temperature (°C)

-40

-15

10

35

60

85

110 125

78

79

80

81

82

83

84

85

Temperature (°C)

-40

-15

10

35

60

85

110 125

0

0.5

1

1.5

2

2.5

3

15

REF4132

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SNAS794A – JUNE 2020 – REVISED JUNE 2020

Product Folder Links: REF4132

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Copyright © 2020, Texas Instruments Incorporated

10.2.2 Detailed Design Procedure

10.2.2.1 Input and Output Capacitors

A 1-μF to 10-μF electrolytic or ceramic capacitor can be connected to the input to improve transient response in

applications where the supply voltage may fluctuate. Connect an additional 0.1-μF ceramic capacitor in parallel to

reduce high frequency supply noise.

A ceramic capacitor of at least a 0.1 μF must be connected to the output to improve stability and help filter out

high frequency noise. An additional 1-μF to 10-μF electrolytic or ceramic capacitor can be added in parallel to

improve transient performance in response to sudden changes in load current; however, keep in mind that doing

so increases the turnon time of the device.

Best performance and stability is attained with low-ESR, low-inductance ceramic chip-type output capacitors

(X5R, X7R, or similar). If using an electrolytic capacitor on the output, place a 0.1-μF ceramic capacitor in parallel

to reduce overall ESR on the output.

10.2.2.2 VIN Slew Rate Considerations

In applications with slow-rising input voltage signals, the reference exhibits overshoot or other transient

anomalies that appear on the output. These phenomena also appear during shutdown as the internal circuitry

loses power.

To avoid such conditions, ensure that the input voltage wave-form has both a rising and falling slew rate faster

than 6 V/ms.

10.2.2.3 Shutdown/Enable Feature

The REF4132 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 2.5 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.

10.2.3 Application Curves

Figure 21. Quiescent Current vs Temperature

Figure 22. Quiescent Current Shutdown Mode