ACT8846 datasheet(39/63 Pages) QORVO

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ACT8846

Advanced PMU for Multi-core

Application Processors

Data Sheet Rev. 13.0, Nov. 11, 2019 | Subject to change without notice

39 of 63

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ALWAYS-ON LDO (REG13)

General Description

REG13 is an always-on, low-dropout linear regulator

(LDO) that is optimized for RTC and backup-battery

applications. REG13 features low-quiescent supply

current, current-limit protection, and reverse-current

protection, and is ideally suited for always-on power

supply applications, such as for a real-time clock, or as

a backup-battery or super-cap charger.

Reverse-Current protection

REG13 features internal circuitry that limits the reverse

supply current to less than 1µA when the input voltage

falls below the output voltage, as can be encountered in

backup-battery charging applications. REG13's internal

circuitry monitors the input and the output, and

disconnects internal circuitry and parasitic diodes when

the input voltage falls below the output voltage, greatly

minimizing backup battery discharge.

Typical Application

Voltage Regulators

REG13 is ideally suited for always-on voltage-regula-

tion applications, such as for real-time clock and

memory keep-alive applications. This regulator requires

only a small ceramic capacitor with a minimum

capacitance of 0.47μF for stability. For best perfor-

mance, the output capacitor should be connected

directly between the output and GA, with a short and

direct connection.

Figure 5:

Typical Application of RTC LDO

Backup Battery Charging

ACT8846

RTC

Supper cap or

Back- up battery

OUT13

REG13 features a constant current-limit, which protects

the IC under output short-circuit conditions as well as

provides a constant charge current, when operating as

a backup battery charger.

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