ADR381ART-R2 Analog Devices Inc, ADR381ART-R2 Datasheet - Page 13

• Manufacturer Part Number: ADR381ART-R2
• Description: IC VREF PREC 2.5V LW DRIFT SOT23
• Manufacturer: Analog Devices Inc
• Series: ADR38r

Specifications of ADR381ART-R2

• Rohs Status: RoHS non-compliant
• Reference Type: Series
• Voltage - Output: 2.5V
• Tolerance: ±0.24%
• Temperature Coefficient: 25ppm/°C
• Voltage - Input: 2.8 ~ 18 V
• Number Of Channels: 1
• Current - Quiescent: 120µA
• Current - Output: 5mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-3, TO-236-3, Micro3™, SSD3, SST3
• Current - Cathode: -

PRECISION HIGH CURRENT VOLTAGE SOURCE
In some cases, the user may want higher output current delivered
to a load and still achieve better than 0.5% accuracy from the
ADR380/ADR381. The accuracy for a reference is normally
specified on the data sheet with no load. However, the output
voltage changes with load current.
The circuit in Figure 30 provides high current without compromis-
ing the accuracy of the ADR380/ADR381. By op amp action,
V
equilibrium, the op amp also drives the N-Channel MOSFET
Q1 into saturation to maintain the current needed at different
loads. R2 is optional to prevent oscillation at Q1. In such an
approach, hundreds of milliamps of load current can be achieved,
and the current is limited by the thermal limitation of Q1. V
V
OUT
OUT
follows V
+ 300 mV.
REF
with very low drop in R1. To maintain circuit
IN
Rev. C | Page 13 of 16
=
V
IN
Figure 30. ADR380/ADR381 for Precision High Current Voltage Source
1
V
ADR380/
ADR381
IN
GND
3
U1
V
OUT
2
8V TO 15V
A1
+V
–V
AD820
C1
0.001µF
100Ω
R2
ADR380/ADR381
100kΩ
R1
2N7002
Q1
R
L
V
OUT