ADR433B View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADR433B

Ultralow Noise XFET® Voltage References with Current Sink and Source Capability

Analog Devices 

ADR430/ADR431/ADR433/ADR434/ADR435/ADR439

PRECISION BOOSTED OUTPUT REGULATOR

A precision voltage output with boosted current capability can

be realized with the circuit shown in Figure 43. In this circuit,

U2 forces VO to be equal to VREF by regulating the turn-on of

N1. Therefore, the load current is furnished by VIN. In this

configuration, a 50 mA load is achievable at a VIN of 5 V. Moderate

heat is generated on the MOSFET, and higher current can be

achieved with a replacement of the larger device. In addition,

for a heavy capacitive load with step input, a buffer can be

added at the output to enhance the transient response.

VIN

2

VIN

U1

ADR431

VOUT 6

TRIM 5

GND

4

N1

5V

2N7002

+

U2 V+

AD8601

V–

–

VO

RL

25Ω

Figure 43. Precision Boosted Output Regulator

Rev. J | Page 21 of 24

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