RT9480 datasheet(5/16 Pages) RICHTEK

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RT9480

DS9480-04

December 2014

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Operation

The RT9480 is a high integrated IC for Li-Ion battery power

bank. It includes a linear charger 1.2A, a synchronous

Boost 5.1V, two output load management, LED indicator

and torch function.

Change Current

Base on thermal regulation function, the charging current

can support up to 1.2A.

VBUS OVP

If the input voltage (VBUS) is higher than the threshold

voltage VOVP, the internal OVP signal will go high and the

charger will stop charging until VIN is below VOVP

− ΔVOVP.

VMID OVP

If the internal voltage (VMID) is higher than the threshold

voltage VOVP, the internal OVP signal will go high and the

charger will stop charging until VMID is below

VOVP

−ΔVOVP.

OCP

The converter senses the current signal when the high-

side P-MOSFET turns on. As a result, The OCP is cycle

by-cycle current limitation. If the OCP occurs, the converter

holds off the next on pulse until inductor current drops

below the OCP limit.

OTP

The converter has an over-temperature protection. When

the junction temperature is higher than the thermal

shutdown rising threshold, the system will be latched and

the output voltage will no longer be regulated until the

junction temperature drops under the falling threshold.

Output Short Protection

When output short to ground, the system will be latched

and the output voltage will no longer be regulated until

power reset.

CC/CV/TR Multi Loop Controller

There are constant current loop, constant voltage loop and

thermal regulation loop to control the charging current.

Too Hot or Too Cold

The temperature sense input TS pin can be connected a

thermistor to determine whether the battery is too hot or

too cold for charging operation. If the battery's temperature

is out of range, charging is paused until it re-enters the

valid range.

RT9480 Datasheet(PDF) 5 Page - Richtek Technology Corporation

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