ISL6255HRZ View Datasheet(PDF) - Intersil

Part Name

Description

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ISL6255HRZ

Highly Integrated Battery Charger with Automatic Power Source Selector for Notebook Computers

Intersil 

ISL6255, ISL6255A

Typical Operating Performance DCIN = 20V, 4S2P Li-Battery, TA = 25°C, unless otherwise noted. (Continued)

ADAPTER REMOVAL

SGATE-CSIP

2V/div

SYSTEM BUS

VOLTAGE

10V/div

BGATE-CSIP

2V/div

INDUCTOR

CURRENT

2A/div

FIGURE 11. SWITCHING WAVEFORMS AT DIODE EMULATION

BGATE-CSIP

2V/div

SYSTEM BUS

VOLTAGE

10V/div

ADAPTER INSERTION

SGATE-CSIP

2V/div

INDUCTOR

CURRENT

2A/div

FIGURE 12. SWITCHING WAVEFORMS IN CC MODE

CHARGE

CURRENT

1A/div

CHLIM

1V/div

FIGURE 13. TRICKLE TO FULL-SCALE CHARGING

Functional Pin Descriptions

BOOT

Connect BOOT to a 0.1µF ceramic capacitor to PHASE pin

and connect to the cathode of the bootstrap schottky diode.

UGATE

UGATE is the high side MOSFET gate drive output.

SGATE

SGATE is the AC adapter power source select output. The

SGATE pin drives an external P-MOSFET used to switch to

AC adapter as the system power source.

BGATE

Battery power source select output. This pin drives an

external P-channel MOSFET used to switch the battery as

the system power source. When the voltage at CSON pin is

higher than the AC adapter output voltage at DCIN, BGATE

is driven to low and selects the battery as the power source.

LGATE

LGATE is the low side MOSFET gate drive output; swing

between 0V and VDDP.

PHASE

The Phase connection pin connects to the high side

MOSFET source, output inductor, and low side MOSFET

drain.

CSOP/CSON

CSOP/CSON is the battery charging current sensing

positive/negative input. The differential voltage across CSOP

and CSON is used to sense the battery charging current,

and is compared with the charging current limit threshold to

regulate the charging current. The CSON pin is also used as

the battery feedback voltage to perform voltage regulation.

CSIP/CSIN

CSIP/CSIN is the AC adapter current sensing

positive/negative input. The differential voltage across CSIP

and CSIN is used to sense the AC adapter current, and is

compared with the AC adapter current limit to regulate the

AC adapter current.

GND

GND is an analog ground.

8

FN9203.2

May 23, 2006

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