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®
Data Sheet
August 2004
ISL6253
FN9117.2
Highly Integrated Battery Charger for
Notebook Computers
The ISL6253 is a highly integrated battery charger controller
for Li-Ion/Li-Polymer batteries. High Efficiency is achieved by
a synchronous buck topology and the use of a MOSFET,
instead of a diode, for selecting power from the adapter or
battery. The low side MOSFET emulates a diode at light
loads to improve the light load efficiency and prevent system
bus boosting.
The constant output voltage can be selected for 2, 3 or 4
series Li-Ion cells with 0.5% accuracy over temperature. It
can also be programmed between 4.2V +5% per cell and
4.2V -5% per cell to optimize battery capacity. When
supplying the load and battery charger simultaneously, the
input current limit for the AC adapter is programmable to
within 3% accuracy to avoid overloading the AC adapter,
and to allow the system to make efficient use of available
adapter power for charging. It also has programmable
charging current with 4% accuracy. The ISL6253 provides
outputs that are used to monitor the current drawn from the
AC adapter, and to monitor for the presence of an AC
adapter. The ISL6253 automatically transitions from
regulating current to regulating voltage. A conditioning
charge feature provides approximately 10% of full scale
charge current to safely charge deeply discharged lithium-
ion (LI+) battery packs when the battery voltage is below
3.0V/cell.
ISL6253 has a feature of automatic power source selection
by switching to the battery when the AC adapter is removed
or switching to the AC adapter when the AC adapter is
available. It also supports aircraft power applications while
powering the system and not charging the battery.
Ordering Information
PART #
TEMP.
RANGE (°C)
PACKAGE
PKG.
DWG. #
ISL6253HRZ
(Note 1)
-10 to 100 28 Ld 5x5 QFN
(Pb-free)
L28.5x5
ISL6253HAZ
(Note 1)
-10 to 100 28 Ld QSOP
(Pb-free)
M28.15
NOTES:
1. Intersil Pb-free products employ special Pb-free material sets;
molding compounds/die attach materials and 100% matte tin
plate termination finish, which is compatible with both SnPb and
Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or
exceed the Pb-free requirements of IPC/JEDEC J Std-020B.
2. Add “-T” for Tape and Reel.
Features
• ±0.5% Voltage Accuracy
• ±3% Input Current Limit Accuracy
• ±4% Accurate Battery Charge Current Limit
• Programmable Charge Limit Current, Adaptor Current
Limit and Charge Voltage
• Fixed 300kHz PWM Synchronous Buck Controller with
Diode Emulation at Light Load
• Output for Current Drawn from the AC Adapter
• AC Adapter Present Indicator
• Fast Input Current Limit Response
• Input Voltage Range 7V to 25V
• Up to 17.6V Battery-Voltage Set Point
• Trickle Charge Mode When Battery Voltage is below
3.0V/Cell
• Supports 2, 3 and 4 Cell Battery Packs
• Control Adapter Power Source Select MOSFET
• Thermal Shutdown
• Aircraft Power Capable
• DC Adapter Present Indicator
• Battery Discharge MOSFET Control
• Less than 10µA Battery Leakage Current
• QFN Package
- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat
No Leads - Package Outline
- Near Chip Scale Package footprint, which improves
PCB efficiency and has a thinner profile
• Pb-free Available
Applications
• Notebook, Desknote and Sub-notebook Computers
• Personal Digital Assistants
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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Pinouts
ISL6253 (28 LD QFN)
TOP VIEW
ISL6253
28 27 26 25 24 23 22
EN 1
21 CSOP
CELLS 2
20 CSIN
ICOMP 3
19 CSIP
VCOMP 4
18 SGATE
ICM 5
17 BGATE
VREF 6
16 PHASE
CHLIM 7
15 UGATE
8 9 10 11 12 13 14
ISL6253 (28 LD QSOP)
TOP VIEW
DCIN 1
VDD 2
ACSET 3
DCSET 4
EN 5
CELLS 6
ICOMP 7
VCOMP 8
ICM 9
VREF 10
CHLIM 11
ACLIM 12
VADJ 13
GND 14
28 DCPRN
27 ACPRN
26 CSON
25 CSOP
24 CSIN
23 CSIP
22 SGATE
21 BGATE
20 PHASE
19 UGATE
18 BOOT
17 VDDP
16 LGATE
15 PGND
2

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ISL6253
Absolute Maximum Ratings
DCIN, CSIP, DCPRN, ACPRN, CSON to GND . . . . . . -0.3V to +28V
CSIP-CSIN, CSOP-CSON . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V
CSIP-SGATE, CSIP-BGATE . . . . . . . . . . . . . . . . . . . . . -0.3V to 16V
PHASE to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -7V to 28V
BOOT to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +35V
BOOT-PHASE, VDD-GND, VDDP-PGND . . . . . . . . . . . . -0.3V to 7V
ICM, ICOMP, VCOMP . . . . . . . . . . . . . . . . . . . . -0.3V to VDD+0.3V
ACSET and DCSET to GND (Note 3) . . . . . . . . -0.8V to VDD+0.3V
VDDP, ACLIM, CHLIM, VREF, CELLS. . . . . . . . -0.3V to VDD+0.3V
EN, VADJ, PGND to GND . . . . . . . . . . . . . . . . . -0.3V to VDD+0.3V
UGATE. . . . . . . . . . . . . . . . . . . . . . . . . PHASE-0.3V to BOOT+0.3V
LGATE . . . . . . . . . . . . . . . . . . . . . . . . . . PGND-0.3V to VDDP+0.3V
Thermal Information
Thermal Resistance
θJA (°C/W) θJC (°C/W)
QFN Package (Notes 4, 6). . . . . . . . . .
39
9.5
QSOP Package (Note 5) . . . . . . . . . . .
80
NA
ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Level 1
Junction Temperature Range. . . . . . . . . . . . . . . . . .-10°C to +150°C
Operating Temperature Range . . . . . . . . . . . . . . . .-10°C to +100°C
Storage Temperature. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Lead Temperature (soldering, 10s).. . . . . . . . . . . . . . . . . . . . +300°C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress ratings only and operation of the
device at these or any other conditions above those indicated in the operational sections of the specifications is not implied.
NOTES:
3. When the voltage across ACSET and DCSET is below 0V, the current through ACSET and DCSET should be limited less than 1mA.
4. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
Tech Brief TB379.
5. θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
6. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications
DCIN = CSIP = CSIN = 18V, CSOP = CSON = 12V, ACSET = DCSET = 1.5V, VREF = ACLIM = CHLIM,
VADJ = Floating, EN = VDD = 5V, BOOT-PHASE = 5.0V, GND = PGND = 0V, CVDD = 1µF IVDD = 0mA,
TA = -10°C to +100°C, TJ 125°C, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNITS
SUPPLY AND BIAS REGULATOR
DCIN Input Voltage Range
7 25 V
DCIN Quiescent Current
EN = VDD, 7V < DCIN < 25V
1.6 4
mA
DCIN Quiescent Current in Shutdown mode
EN = 0, 7V < DCIN < 25V
1.3 3
mA
Battery Leakage Current (Note 5)
DCIN = 0, no load
2 10 µA
VDD Output Voltage/Regulation
VDD Undervoltage Lockout Trip Point
7V < DCIN < 25 V, 0 < IVDD < 30mA
Rising
4.925
4.2
5.075
4.4
5.225
4.6
V
V
Hysteresis
100 250 400
mV
Reference Output Voltage VREF
O < IVREF < 300µA
CSON = 16.8V, CELLS = VDD, VADJ = Float
2.365
-0.5
2.390
0
2.415
0.5
V
CSON = 12.6V, CELLS = GND, VADJ = Float -0.55 0 0.55
CSON = 8.4V, CELLS = FLOAT, VADJ = Float -0.55 0 0.55
CSON = 17.64V, CELLS = VDD, VADJ = VREF -0.6 0 0.6
Battery Charge Voltage Accuracy
CSON = 13.23V, CELLS = GND, VADJ = VREF -0.6 0 0.6
%
CSON = 8.82V, CELLS = FLOAT, VADJ = VREF -0.6 0 0.6
CSON = 15.96V, CELLS = VDD, VADJ = GND -0.6 0 0.6
CSON = 11.97V, CELLS = GND, VADJ = GND -0.6 0 0.6
CSON = 7.98V, CELLS = FLOAT, VADJ = GND -0.6 0 0.6
TRIP POINTS
ACSET Threshold
1.235 1.26 1.285
V
ACSET Input Bias Current Hysteresis
2 3.4 4.8 µA
ACSET Input Bias Current
ACSET > 1.26V
2 3.4 4.8 µA
ACSET Input Bias Current
ACSET < 1.26V
-1 0 1 µA
DCSET Threshold
1.235 1.26 1.285
V
3

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ISL6253
Electrical Specifications
DCIN = CSIP = CSIN = 18V, CSOP = CSON = 12V, ACSET = DCSET = 1.5V, VREF = ACLIM = CHLIM,
VADJ = Floating, EN = VDD = 5V, BOOT-PHASE = 5.0V, GND = PGND = 0V, CVDD = 1µF IVDD = 0mA,
TA = -10°C to +100°C, TJ 125°C, unless otherwise noted. (Continued)
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNITS
DCSET Input Bias Current Hysteresis
2 3.4 4.8 µA
DCSET Input Bias Current
DCSET 1.26V
2 3.4 4.8 µA
DCSET Input Bias Current
DCSET < 1.26V
-1 0 1 µA
OSCILLATOR
Frequency
240 300 360
kHz
PWM Ramp Voltage (peak-peak)
CSIP = 18V
1.4 1.55 1.7
V
CSIP = 11V
0.8 0.9 1.0
V
SYNCHRONOUS BUCK REGULATOR
Maximum Duty Cycle
300kHz
97 99 99.6 %
UGATE Pull-up Resistance
BOOT-PHASE = 5V, 500mA source current
1.8 3.0
UGATE Source Current
BOOT-PHASE = 5V, BOOT-UGATE = 2.5V
1.0
A
UGATE Pull-down Resistance
BOOT-PHASE = 5V, 500mA sink current
0.9 1.8
UGATE Sink Current
BOOT-PHASE = 5V, UGATE-PHASE = 2.5V
1.8
A
LGATE Pull-up Resistance
VDDP-PGND = 5V, 500mA source current
1.8 3.0
LGATE Source Current
VDDP-PGND = 5V, VDDP-LGATE = 2.5V
1.0 A
LGATE Pull-down Resistance
VDDP-PGND = 5V, 500mA sink current
0.9 1.8
LGATE Sink Current
VDDP-PGND = 5V, LGATE = 2.5V
1.8 A
CHARGING CURRENT SENSING AMPLIFIER
Input Common Mode Range
0 18 V
Input Offset Voltage
Guarantee by design
-3 0 3 mV
Input Bias Current at CSOP
0 < CSOP < 18V
10 20
µA
Input Bias Current at CSON
0 < CSON < 18V
300 425
µA
CSOP to CSON Input Full Scale Sense Voltage
CHLIM = 3.3V
123 127 131
mV
CHLIM = VREF
96 100 104 mV
CHLIM = FLOAT
61 65 69 mV
CHLIM = GND
26 30 34 mV
CSOP to CSON Input Full Scale Sense Voltage in Trickle CHLIM = 3.3V
Charge Mode
CHLIM = VREF
6
8.9 12.0
mV
4.0 7.5 11.0 mV
CHLIM = FLOAT
2.5 5.6 9.0
mV
CHLIM = GND
1.5 3.7 7.0
mV
Trickle Charge Threshold Voltage
CSON Rising
3.0 3.1 3.2 V/CELL
Hysteresis
20 100 180 mV/CELL
CHLIM Input Bias Current
CHLIM = GND or VREF
-25 25 µA
ADAPTER CURRENT SENSING AMPLIFIER
Input Common Mode Range
7 25 V
Input Offset Voltage
Guarantee by design
-2 2 mV
Input Bias Current at CSIP
0 < CSIP < DCIN
325 475
µA
Input Bias Current at CSIN
0 < CSIN < DCIN
1 10 µA
ADAPTER CURRENT LIMIT THRESHOLD
CSIP to CSIN Input Full Scale Sense Voltage
ACLIM = VREF
100 103 106
mV
ACLIM = Float
75 78 81 mV
ACLIM = GND
50 53 56 mV
4

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ISL6253
Electrical Specifications
DCIN = CSIP = CSIN = 18V, CSOP = CSON = 12V, ACSET = DCSET = 1.5V, VREF = ACLIM = CHLIM,
VADJ = Floating, EN = VDD = 5V, BOOT-PHASE = 5.0V, GND = PGND = 0V, CVDD = 1µF IVDD = 0mA,
TA = -10°C to +100°C, TJ 125°C, unless otherwise noted. (Continued)
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNITS
ACLIM Input Bias Current
ACLIM = GND, or VREF
-25 25 µA
VOLTAGE REGULATION ERROR AMPLIFIER
Error Amplifier Trans-conductance from CSON to
VCOMP
CELLS = VDD
20 30 40 µA/V
VCOMP Voltage Range
0.3 4 V
CURRENT REGULATION ERROR AMPLIFIER
Charging Current Error Amplifier Trans conductance
50 µA/V
Adapter Current Error Amplifier Trans conductance
50 µA/V
ICOMP Voltage Range
0.3 4 V
BATTERY CELL SELECTOR
CELLS Input Low Voltage
0.5 V
CELLS Input Float Voltage
CELLS = Float
VREF VREF VREF
-0.3 + 0.3
V
CELLS Input High Current
VDD-
0.5
V
MOSFET DRIVER
BGATE Pull-up Current
CSIP-BGATE = 3V
1 1.4 2
mA
BGATE Pull-down Current
CSIP-BGATE = 5V
3.25 5.0
7
mA
CSIP-BGATE Voltage High
8.0 10 12
V
CSIP-BGATE Voltage Low
0 0.1
V
DCIN-CSON Threshold for CSIP-BGATE Going High DCIN = 12V, CSON Rising
-200 0 200 mV
DCIN-CSON Threshold for CSIP-BGATE Going Low DCIN = 12V, CSON Falling
0 300 500 mV
DCIN-CSON Threshold Hysteresis
250 300 400
mV
SGATE Pull-up Current
CSIP-SGATE = 3V
1.0 1.4 2.0
mA
SGATE Pull-down Current
CSIP-SGATE = 2.5V
40 150 350
µA
CSIP-SGATE Voltage High
5 8.5 15
V
CSIP-SGATE Voltage Low
0 0.1
V
CSIP-CSIN Threshold for CSIP-SGATE Going High
3 8.5 15 mV
CSIP-CSIN Threshold Hysteresis
1 2 6 mV
LOGIC INTERFACE
EN Low Level Input Voltage
0.8 V
EN High Level Input Voltage
2.0 V
ACPRN Sink Current
ACPRN = 0.4V
3 8 13 mA
ACPRN Leakage Current
ACPRN = 20V
-1 1 µA
DCPRN Sink Current
DCPRN = 0.4V
3 8 13 mA
DCPRN Leakage Current
DCPRN = 20V
-1 1 µA
ICM Output Voltage
Iload = 0 to 100µA, CSIP-CSIN = 103mV
1.885 1.980 2.085
V
Thermal Shutdown Temperature
Rising
150 °C
Thermal Shutdown Temperature Hysteresis
20 °C
NOTE:
7. This is sum of currents in these pins (CSIP, CSIN, BOOT, UGATE, PHASE, CSOP and CSON) tied together to 18V. EN, ACSET, DCSET, VADJ,
CELLS, ACLIM, CHLIM, VDD, DCIN = 0.
5