ACT8849 datasheet(34/35 Pages) ACTIVE-SEMI

34 / 35 page

ACT8849

Rev PrB, 12-Jun-14

Innovative PowerTM

- 34 -

www.active-semi.com

Active-Semi Confidential―Do Not Copy or Distribute

ActivePMU

TM is a trademark of Active-Semi.

I2CTM is a trademark of NXP.

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

encountered

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-

regulation 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 performance, the output capacitor should be

connected directly between the output and GA, with

a short and direct connection.

Figure 4:

Typical Application of RTC LDO

Backup Battery Charging

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.

ALWAYS-ON LDO (REG13)

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