J

A

D

JA

T

T

P

R

T

u

REF(MAX)

REF(MIN)

6

REF

V

V

Drift =

10

V

Temperature Range

·

§

u

¸

¨

u

©

¹

Enable

Blocks

Bandgap

Core

EN

GND

N/C

VIN

VREF

Buffer

Digital

12

REF4132

SNAS794A – JUNE 2020 – REVISED JUNE 2020

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9 Detailed Description

9.1 Overview

The REF4132 is family of low-noise, precision bandgap voltage references that are specifically designed for

excellent initial voltage accuracy and drift. The Functional Block Diagram is a simplified block diagram of the

REF4132 showing basic band-gap topology.

9.2 Functional Block Diagram

9.3 Feature Description

9.3.1 Supply Voltage

The REF4132 family of references features an extremely low dropout voltage. For loaded conditions, a typical

dropout voltage versus load is shown on Dropout vs. Current Load Over Temperature. The REF4132 features a

low quiescent current that is extremely stable over changes in both temperature and supply. The typical room

temperature quiescent current is 80 μA, and the maximum quiescent current over temperature is 100 μA. Supply

voltages below the specified levels can cause the REF4132 to momentarily draw currents greater than the typical

quiescent current. Use a power supply with a low output impedance.

9.3.2 Low Temperature Drift

The REF4132 is designed for minimal drift error, which is defined as the change in output voltage over

temperature. The drift is calculated using the box method, as described by Equation 3:

(3)

9.3.3 Load Current

The REF4132 family is specified to deliver a current load of ±10 mA per output. The VREF output of the device

are protected from short circuits by limiting the output short-circuit current to 18 mA. The device temperature

increases according to Equation 4:

where

•

TJ = junction temperature (°C),

•

TA = ambient temperature (°C),

•

PD = power dissipated (W), and

•

RθJA = junction-to-ambient thermal resistance (°C/W)

(4)

The REF4132 maximum junction temperature must not exceed 150°C.