ISL6251 Просмотр технического описания (PDF) - Renesas Electronics

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ISL6251

Low Cost Multi-Chemistry Battery Charger Controller

Renesas Electronics 

ISL6251, ISL6251A

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.

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.

DCIN

The DCIN pin is the input of the internal 5V LDO. Connect it to the

AC adapter output. Connect a 0.1F ceramic capacitor from DCIN

to PGND.

ACSET

ACSET is an AC adapter detection input. Connect to a resistor

divider from the AC adapter output.

ACPRN

Open-drain output signals AC adapter is present. ACPRN pulls low

when ACSET is higher than 1.26V; and pulled high when ACSET is

lower than 1.26V.

EN

EN is the Charge Enable input. Connecting EN to high enables the

charge control function, connecting EN to low disables charging

functions. Use with a thermistor to detect a hot battery and

suspend charging.

ICM

ICM is the adapter current output. The output of this pin produces

a voltage proportional to the adapter current.

PGND

PGND is the power ground. Connect PGND to the source of the

low side MOSFET for the low side MOSFET gate driver.

VDD

VDD is an internal LDO output to supply IC analog circuit. Connect

a 1F ceramic capacitor to ground.

VDDP

VDDP is the supply voltage for the low-side MOSFET gate driver.

Connect a 4.7 resistor to VDD and a 1F ceramic capacitor to

power ground.

ICOMP

ICOMP is a current loop error amplifier output.

VCOMP

VCOMP is a voltage loop amplifier output.

CELLS

This pin is used to select the battery voltage. CELLS = VDD for a

4S battery pack, CELLS = GND for a 3S battery pack, CELLS =

Float for a 2S battery pack.

VADJ

VADJ adjusts battery regulation voltage. VADJ = VREF for

4.2V+5%/cell; VADJ = Floating for 4.2V/cell; VADJ = GND for

4.2V-5%/cell. Connect to a resistor divider to program the

desired battery cell voltage between 4.2V-5% and 4.2V+5%.

CHLIM

CHLIM is the battery charge current limit set pin. CHLIM input

voltage range is 0.1V to 3.6V. When CHLIM = 3.3V, the set point

for CSOP-CSON is 165mV. The charger shuts down if CHLIM is

forced below 88mV.

ACLIM

ACLIM is the adapter current limit set pin. ACLIM = VREF for

100mV, ACLIM = Floating for 75mV, and ACLIM = GND for 50mV.

Connect a resistor divider to program the adapter current limit

threshold between 50mV and 100mV.

VREF

VREF is a 2.39V reference output pin. It is internally

compensated. Do not connect a decoupling capacitor.

FN9202 Rev 3.00

March 13, 2014

Page 8 of 20

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