DNC

TEMP

GND

DNC

NC

TRIM/NR

C

C

R

C

C

REF5010, REF5020, REF5025, REF5030

REF5040, REF5045, REF5050

www.ti.com

SBOS410G – JUNE 2007 – REVISED NOVEMBER 2015

11 Power Supply Recommendations

The REF50xx family of voltage references features extremely low dropout voltage. With the exception of the

REF5020, which has a minimum supply requirement of 2.7 V, these references can be operated with a supply of

200 mV more than the output voltage in an unloaded condition. For loaded conditions, a typical dropout voltage

versus load plot is shown in Figure 6 in the Typical Characteristics. TI recommends a supply bypass capacitor

ranging from 1

μF to 50 μF.

12 Layout

12.1 Layout Guidelines

•

Place the power-supply bypass capacitor as closely as possible to the supply and ground pins. The

recommended value of this bypass capacitor is from 1

μF to 10 μF. If necessary, additional decoupling

capacitance can be added to compensate for noisy or high-impedance power supplies.

•

Place a 1-

μF noise filtering capacitor between the NR pin and ground.

•

The output must be decoupled with a 1-

μF to 50-μF capacitor. In series with load capacitor, add an ESR of 1

Ω for the best noise performance.

•

A high-frequency, 1-

μF capacitor can be added in parallel between the output and ground to filter noise and

help with switching loads as data converters.

12.2 Layout Example

Figure 44. Layout Example

12.3 Power Dissipation

The REF50xx family is specified to deliver current loads of ±10 mA over the specified input voltage range. The

temperature of the device increases according to Equation 4

where

•

•

•

•

(4)

The REF50xx junction temperature must not exceed the absolute maximum rating of 150°C.

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Product Folder Links: REF5010 REF5020 REF5025 REF5030 REF5040 REF5045 REF5050