RT9513 datasheet(7/9 Pages) RICHTEK

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RT9513

DS9513-01 April 2011

www.richtek.com

The parameter KSET = 300 ; VSET = 2.5V. RSETA is the

resistor connected between the ISETA and GND.

Pre- Charge Current Setting

During a charge cycle if the battery voltage is below the

VPRECH threshold, the RT9513 applies a pre-charge mode

to the battery. This feature revives deeply discharged cells

and protects battery life. The RT9513 internal determines

the pre-charge rate as 10% of the fast-charge current.

Battery Voltage Regulation

The RT9513 monitors the battery voltage through the BATT

pin. Once the battery voltage level closes to the VREG

threshold, the RT9513 voltage enters constant phase and

the charging current begins to taper down. When battery

voltage is over the VREG threshold, the RT9513 will stop

charge and keep to monitor the battery voltage. However,

when the battery voltage decreases 100mV below the

VREG, it will be recharged to keep the battery voltage.

Charge Status Outputs

The open-drain CHG_S and PGOOD outputs indicate

various charger operations as shown in the following table.

These status pins can be used to drive LEDs or

communicate to the host processor. Note that ON

indicates the open-drain transistor is turned on and LED

is bright.

Application Information

Automatically Power Source Selection

The RT9513 is a battery charger IC which is designed for

Li-ion Battery with 4.2V rated voltage.

AC Mode : When the AC input voltage (ACIN) is higher

than the UVP voltage level (4.4V), the RT9513 will enter

AC Mode. In the AC Mode, ACIN P-MOSFET is turned on

and USB P-MOSFET is turned off.

Sleep Mode : The RT9513 will enter Sleep Mode when

AC input voltage are removed. This feature provides low

leakage current from the battery during the absence of

input supply.

ACIN Over Voltage Protection

The AC input voltage is monitored by an internal OVP

comparator. The comparator has an accurate reference of

2.5V from the band-gap reference. The OVP threshold is

set by the internal resistive. The protection threshold is

set to 6.5V. When the input voltage exceeds the threshold,

the comparator outputs a logic signal to turn off the power

P-MOSFET to prevent the high input voltage from damaging

the electronics in the handheld system. When the input

over oltage condition is removed (ACIN < 6V), the

comparator re-enables the output by running through the

soft-start.

SET

charge_ac

SET

SETA

= K

Figure 1. AC Mode Charge Current Setting

200

400

600

800

1000

1200

0.5

1.5

2.5

3.5

4.5

5.5

6.5

7.5

8.5

9.5

RSETA (k

Ω)

Charge State

CHG_S

PGOOD

ACIN

Charge

Charge done

OFF

Fast-Charge Current Setting

The RT9513 offers ISETA pin to determine the AC charge

rate from 100mA to 1.2A. The charge current can be

calculated as following equation.

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