Datasheet

DNC
TEMP
V
OUT
V
IN
GND
DNC
NC
TRIM/NR
REF50xx
C
BYPASS
1 Fto10 Fm m
C
L
1 Fto50 Fm m
+V
SUPPLY
V
OUT
R5
60kW
REF50xx
TEMP
V
OUT
GND
TRIM/NR
V
IN
aT
aT
(10 Am
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
μF is recommended. A 1-μF to 50-μF, low-ESR output capacitor (C
L
) must be connected from V
OUT
to GND. The
ESR value should be less than or equal to 1.5 Ω. The ESR minimizes gain peaking of the internal 1.2-V
reference and thus reduces noise at the V
OUT
pin.
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.
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