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ISL6257HRZ View Datasheet(PDF) - Intersil

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Description
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ISL6257HRZ Datasheet PDF : 22 Pages
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ISL6257
Typical Operating Performance DCIN = 20V, 4S2P Li-Battery, TA = +25°C, unless otherwise noted. (Continued)
18
Line and Load
16
Regulation
14
12
10Vin-8.4Vout
15Vin-8.4Vout
10
20Vin-8.4Vout
25Vin-8.4Vout
8
15Vin-12.6Vout
6
20Vin-12.6Vout
25Vin-12.6Vout
4
20Vin-16.8Vout
Adapter Current
25Vin-16.8Vout
2
Limit Mode
0
0
2
4
6
8
10
12
System Load Current (Amps)
FIGURE 17. LINE AND LOAD REGULATION IN NVDC MODE
0.6%
0.4%
0.2%
0.0%
-0.2%
-0.4% Adapter Current
Limit Mode
Line and Load
Regulation (%)
10Vin-8.4Vout
15Vin-8.4Vout
20Vin-8.4Vout
25Vin-8.4Vout
15Vin-12.6Vout
20Vin-12.6Vout
25Vin-12.6Vout
20Vin-16.8Vout
25Vin-16.8Vout
upper limit
lowerlimit
-0.6%
0
2
4
6
8
10
12
System Load Current (Amps)
FIGURE 18. LINE AND LOAD REGULATION IN NVDC MODE
AS A PERCENTAGE OF NO LOAD VOLTAGE
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 in non Narrow VDC systems.
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. In Narrow VDC systems
BGATE should be unconnected.
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 0.1µF ceramic
capacitor from DCIN to CSON.
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.
DCSET
DCSET is a lower voltage adapter detection input (like
aircraft power 15V). Allows the adapter to power the system
where battery charging has been disabled.
DCPRN
Open-drain output signals DC adapter is present. DCPRN
pulls low when DCSET is higher than 1.26V and pulled high
when DCSET 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.
8
FN9288.2
January 17, 2007
 

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