noise due to mechanical vibrations, potentially dominating the noise of the REF53-Q1. More information on how

the piezoelectric effect can be explored in systems can be found in Stress-induced outbursts: Microphonics in

ceramic capacitors (Part 1) and Stress-induced outbursts: Microphonics in ceramic capacitors (Part 2) . Designer

must use film capacitors for noise sensitive applications. TI recommends placing the REF53-Q1 reference as

close to the load as possible to minimize IR drop due to trace resistance.

The turn-on time response of the REF53-Q1 is shown in Figure 9-2. The turn-on time of the REF53-Q1 family

depends on the reference pin capacitor. Increasing the output capacitor improves the load transient performance

of the device, however this also increases the turn-on time. Figure 9-3 shows the turn-on time with CREF = 10μF,

increases to 1msec.

9.2.1.3 Application Curves

Te mperature (

C)

-40

-7

26

59

92

125

0

0.1

0.2

0.3

0.4

0.5

VIN = 3V

VIN = 18V

Figure 9-2. REF53250QDDCRQ1 Turn-On time

(CREF= 1uF, CIN= 0.1uF)

Te mperature (

C)

-40

-7

26

59

92

125

1

1.1

1.2

1.3

1.4

1.5

VIN = 3V

VIN = 18V

Figure 9-3. REF53250QDDCRQ1 Turn-On time

(CREF= 10uF, CIN= 0.1uF )

9.2.2 Constant Current Reference

Multiple applications such as sensor biasing, LED driving, battery charging, and so forth need, precision constant

current source. REF53-Q1 device with precision performance, wide input voltage support, multiple output voltage

options meets various application level requirements to be configured as constant current source.

Figure 9-4 shows REF53-Q1 configured as a constant current source. REF53-Q1 is configured as floating

device with device GND driving the load. The precision voltage reference from REF53-Q1 along with an external

precision reference draw a constant current from the input supply denoted as 'I'. The effective current flowing

through the load is combination of REF53-Q1 device quiescent current and the programmed value I. The wide

VIN voltage support of REF53-Q1 allows for wide voltage variation across the load while still maintaining the

constant current accuracy.

REF53-Q1

SNVSCU8 – AUGUST 2026

www.ti.com

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