MAX17823BGCV datasheet(35/121 Pages) MAXIM

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MAX17823B

12-Channel High-Voltage Data Acquisition System

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Maxim Integrated | 35

Low-Voltage Regulator

An internal linear regulator supplies low-voltage power (VAA) for the ADC and digital logic. The regulator is disabled

when SHDNL is active-low or when the die temperature (TDIE) exceeds 145°C. Once VAA decays below 2.95V typical,

an internal power-on reset (POR) will be generated as shown in Figure 22. This event can be detected with the

ALRTRST bit as shown in Table 15. After a thermal shutdown, the regulator will not be enabled until TDIE < 130°C

due to hysteresis.

Table 14. Low-Voltage Regulator

Input: DCIN

Input Voltage: 9V to 65V

Output: VAA

Output Voltage: 3.3V

Disable: VSHNDL < 0.6V or TDIE > 145°C

The low-voltage regulator is continuously monitored for under-voltage as described in Table 15.

Table 15. Low-Voltage Regulator Diagnostic

Fault

Condition

Alert

Location

VAA under-voltage

VAA < 2.95V

ALRTRST

STATUS[15]

Regulator

Enable

DCIN

SHDNL

AGND

CDCIN

RDCIN

Linear

Regulator

VAA

CVAA

CSHDNL

To SHDNL

Charge

Pump

Thermal

Shutdown

Internal

POR/

3.0V

Figure 17. Low-Voltage Regulator

MAX17823BGCV Datasheet(PDF) 35 Page - Maxim Integrated Products

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