ZXRD060

0.6V DUAL ADJUSTABLE PRECISION SHUNT REGULATOR

ZXRD060

Document number: DS35359 Rev. 4 - 2

2 of 12

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August 2011

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Pin Description

Pin

(DFN)

Name

Function

1

PGND1

Power Ground 1: Ground return for emitter of output transistor: Connect PGND1/2 and GND together.

2

OUT1

Output 1. Connect a capacitor close to device between OUT1 and GND. See Applications Information

section.

3

GND

Analog Ground: Ground return for reference and amplifiers: Connect GND and PGND1/2 together.

4

PGND2

Power Ground 2: Ground return for emitter of output transistor: Connect PGND1/2 and GND together.

5

OUT2

Output 2. Connect a capacitor close to device between OUT2 and GND. See Applications Information

section.

6

FB2

Feedback Input 2. Regulates to 600mV nominal.

7

IN2

Supply Input 2. Connect a 0.1

μF ceramic capacitor close to the device from IN2 to GND.

8

FB1

Feedback Input 1. Regulates to 600mV nominal.

9

No connection

10

IN1

Supply Input 1. Connect a 0.1

μF ceramic capacitor close to the device from IN1 to GND.

Flag

Floating or connect to GND

Function Block Diagram

The ZXRD060 differs from most other shunt regulators in that it has separate input and output pins and a low voltage

reference. This enables it to regulate rails down to 600mV and makes the part ideal for isolated power supply applications that

use opto-couplers in the feedback loop and where the open-collector output is required to operate down to voltages as low as

200mV.

The wide input voltage range of 2V to 18V and output voltage range of 0.2V to 18V enables the ZXRD060 to be powered from

allows it to operate as a low-dropout voltage regulator for microprocessor/DSP/PLD cores.

As with other shunt regulators (and shunt references), the ZXRD060 compares its internal amplifier FB pin to a high accuracy

internal reference; if FB is below the reference then OUT turns off, but if FB is above the reference then OUT sinks current –

up to a maximum of 15mA.