DNC

TEMP

V

OUT

V

IN

GND

DNC

NC

TRIM/NR

REF50xx

C

BYPASS

1 Fto10 F

m

m

C

L

1 Fto50 F

m

m

+V

SUPPLY

V

OUT

R5

60kW

REF50xx

TEMP

V

OUT

GND

TRIM/NR

V

IN

aT

aT

(10 A

m

at+25 C)

°

R2

R1

R3

R4

10kW

1kW

1.2V

REF5020-Q1, REF5025-Q1, REF5030-Q1

REF5040-Q1, REF5045-Q1, REF5050-Q1

www.ti.com

SBOS456G – SEPTEMBER 2008 – REVISED OCTOBER 2013

APPLICATION INFORMATION

The REF50xx is family of low-noise, precision-bandgap voltage references that are specifically designed for

excellent initial voltage accuracy and drift. Figure 25 shows a simplified block diagram of the REF50xx.

Figure 25. REF50xx Simplified Block Diagram

BASIC CONNECTIONS

Figure 26 shows the typical connections for the REF50xx. A supply bypass capacitor ranging between 1

μF to 10

ESR value should be less than or equal to 1.5

Ω. The ESR minimizes gain peaking of the internal 1.2-V

Figure 26. Basic Connections

SUPPLY VOLTAGE

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 above the output voltage in an unloaded condition. For loaded conditions, a typical dropout voltage

versus load plot is shown in Figure 6 of the Typical Characteristics.

Copyright © 2008–2013, Texas Instruments Incorporated

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