REF20xx-Q1 Low-Drift, Low-Power, Dual-Output, V
REF
and V
REF
/ 2 Voltage References
1 Features
• AEC-Q100 qualified with the following results:
– Device temperature grade 1: –40°C to +125°C
ambient operating temperature
– Device HBM ESD classification level 2
– Device CDM ESD classification level C7B
• Functional Safety-Capable
– Documentation available to aid functional safety
system design
• Two Outputs, V
REF
and V
REF
/ 2, for convenient
use in single-supply systems
• Excellent temperature drift performance:
– 8 ppm/°C (maximum) from –40°C to 125°C
• High initial accuracy: ±0.05% (maximum)
• V
REF
and V
BIAS
tracking overtemperature:
– 7 ppm/°C (maximum) from –40°C to 125°C
• Microsize package: SOT23-5
• Low dropout voltage: 10 mV
• High output current: ±20 mA
• Low quiescent current: 360 μA
• Line regulation: 3 ppm/V
• Load regulation: 8 ppm/mA
2 Applications
• Telematics control
• Battery management systems
• Inverter and motor control
• Automotive gateway
• Power distribution box
• Power steering
• On board chargers
3 Description
Applications with only a positive supply voltage often
require additional stable voltage in the middle of the
analog-to-digital converter (ADC) input range to bias
input bipolar signals. The REF20xx-Q1 provides a
reference voltage (V
REF
) for the ADC and a second
highly-accurate voltage (V
BIAS
) that can be used to
bias the input bipolar signals.
The REF20xx-Q1 offers excellent temperature drift
(8 ppm/°C, maximum) and initial accuracy (0.05%)
on both the V
REF
and V
BIAS
outputs while operating
at a quiescent current less than 430 µA. In addition,
the V
REF
and V
BIAS
outputs track each other with
a precision of 7 ppm/°C (maximum) across the
temperature range of –40°C to 125°C. All these
features increase the precision of the signal chain and
decrease board space, while reducing the cost of the
system as compared to a discrete solution. Extremely
low dropout voltage of only 10 mV allows operation
from very low input voltages, which can be very useful
in battery-operated systems.
Both the V
REF
and V
BIAS
voltages have the same
excellent specifications and can sink and source
current equally well. Very good long-term stability and
low noise levels make these devices ideally-suited for
high-precision applications.
Device Information
PART NAME PACKAGE
(1)
BODY SIZE (NOM)
REF20xx-Q1 SOT-23 (5) 2.90 mm × 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
INA240-Q1
V
IN
REF20-Q1
V
REF
= 3.0 V
V
BIAS
= 1.5 V
EN
ADC
GND
LOAD
I
SENSE
R
SHUNT
V
IN-
V
IN+
REF1
V
OUT
Power
Supply
REF2
Application Example
-0.05
-0.04
-0.03
-0.02
-0.01
0
0.01
0.02
0.03
0.04
0.05
±75 ±50 ±25 0 25 50 75 100 125 150
Output Voltage Accuracy (%)
Temperature (ƒC)
C001
V
REF
V
BIAS
V
REF
and V
BIAS
vs Temperature
REF20-Q1
SBOSA80 – DECEMBER 2021
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
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