ISL6256HAZ Intersil, ISL6256HAZ Datasheet - Page 24

• Manufacturer Part Number: ISL6256HAZ
• Description: IC BATTERY CHARGER CTRLR 28-QSOP
• Manufacturer: Intersil

Specifications of ISL6256HAZ

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 7 V ~ 25 V
• Operating Temperature: -10°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP (0.150", 3.95mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

voltage swing from the input voltage to ground. No trace should
be in parallel with it. This trace is also the return path for
UGATE. Connect this pin to the high-side MOSFET source.
UGATE Pin
This pin has a square shape waveform with high dv/dt. It
provides the gate drive current to charge and discharge the
top MOSFET with high di/dt. This trace should be wide,
short, and away from other traces similar to the LGATE.
BOOT Pin
This pin’s di/dt is as high as the UGATE; therefore, this trace
should be as short as possible.
CSOP, CSON Pins
Accurate charge current and adapter current sensing is
critical for good performance. The current sense resistor
connects to the CSON and the CSOP pins through a low
pass filter with the filter cap very near the IC (see Figure 2).
Traces from the sense resistor should start at the pads of the
sense resistor and should be routed close together,
throughout the low pass filter and to the CSON and CSON
pins (see Figure 25). The CSON pin is also used as the
battery voltage feedback. The traces should be routed away
from the high dv/dt and di/dt pins like PHASE, BOOT pins. In
general, the current sense resistor should be close to the IC.
These guidelines should also be followed for the adapter
current sense resistor and CSIP and CSIN. Other layout
arrangements should be adjusted accordingly.
CURRENT
TRACE
HIGH
FIGURE 25. CURRENT SENSE RESISTOR LAYOUT
KELVIN CONNECTION TRACES
TO THE LOW PASS FILTER
CSOP AND CSON
RESISTOR
RESISTER
SENSE
AND
24
CURRENT
TRACE
HIGH
ISL6256, ISL6256A
EN Pin
This pin stays high at enable mode and low at idle mode and
is relatively robust. Enable signals should refer to the signal
ground.
DCIN Pin
This pin connects to AC adapter output voltage, and should
be less noise sensitive.
Copper Size for the Phase Node
The capacitance of PHASE should be kept very low to
minimize ringing. It would be best to limit the size of the
PHASE node copper in strict accordance with the current
and thermal management of the application.
Identify the Power and Signal Ground
The input and output capacitors of the converters, the source
terminal of the bottom switching MOSFET PGND should
connect to the power ground. The other components should
connect to signal ground. Signal and power ground are tied
together at one point.
Clamping Capacitor for Switching MOSFET
It is recommended that ceramic caps be used closely
connected to the drain of the high-side MOSFET, and the
source of the low-side MOSFET. This capacitor reduces the
noise and the power loss of the MOSFET.
September 14, 2010
FN6499.3