APL3207 datasheet(13/19 Pages) ANPEC

13 / 19 page

Rev. A.3 - Sep., 2012

APL3207

www.anpec.com.tw

Function Description (Cont.)

Charge Status Output (STAT) (Cont.)

STAT

Output

Mode

VIN

VBATT

VSET

Low

Charge mode

VIN>VUVLO

VIN>VBATT+

VASD

VBATT<4.2V

0.1V<VSET<1.2V

Shutdown mode

VSET>1.2V

Standby mode

VIN>VUVLO

VIN>VBATT+

VASD

VBATT>4.2V

High

Sleep mode

VIN<VUVLO

VIN<VBATT+

VASD

Battery is

connected

LDO Regulator

Table1. STAT Pin Summary

The APL3207 has been built in a regulator whose output

voltage is fixed at 3.3V. When the system is powered by a

battery, the regulator is fully powered by the battery;

however, when the battery is charged, the regulator input

is switched to the USB or adapter (by using external circuit)

and powered by the USB or adapter, which reduces the

charging time.

Regulator Current Limit and Short Circuit

The APL3207 includes a current limit circuitry for LDO

regulator. The current limit circuitry senses the output

current and limits the maximum output current to prevent

the APL 3207 and external loads frorm being damaged.

The point where limitation occurs is I

LDO=300mA (typical).

When the output is shortened to the ground, the regulator

reduces the current-limit threshold down to 50mA (typical).

The output can be shortened to the ground for an indefi-

nite amount of time without damaging the part.

Regulator Thermal Protection

The LDO regulator has a built-in thermal protection

function. When the junction temperature exceeds +135oC,

the thermal sensor generates a logic signal to turn off the

regulator which makes the die cool down. When the junc-

tion temperature cools down by 20oC, the thermal sen-

sor turns the regulator on again, resulting in a pulsed

output during continuous thermal protection. Thermal pro-

tection is designed to protect the IC in the event of fault

conditions.

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