DATASHEET
ISL6253
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.
FN9117
Rev.2.00
August 2004
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
Ordering Information
PART #
ISL6253HRZ
(Note 1)
ISL6253HAZ
(Note 1)
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.
TEMP.
RANGE (°C)
-10 to 100
-10 to 100
PACKAGE
28 Ld 5x5 QFN
(Pb-free)
28 Ld QSOP
(Pb-free)
PKG.
DWG. #
L28.5x5
M28.15
Applications
• Notebook, Desknote and Sub-notebook Computers
• Personal Digital Assistants
FN9117 Rev.2.00
August 2004
Page 1 of 22
ISL6253
Pinouts
ISL6253 (28 LD QFN)
TOP VIEW
DCPRN
ACPRN
DCSET
ACSET
CSON
DCIN
VDD
DCIN
VDD
ACSET
21
20
19
18
17
16
15
8
ACLIM
9
VADJ
10
GND
11
PGND
12
LGATE
13
VDDP
14
BOOT
CSOP
CSIN
CSIP
SGATE
BGATE
PHASE
UGATE
DCSET
EN
CELLS
ICOMP
VCOMP
ICM
ICM
VREF
CHLIM
5
6
7
VREF
CHLIM
ACLIM
VADJ
GND
ISL6253 (28 LD QSOP)
TOP VIEW
1
2
3
4
5
6
7
8
9
10
11
12
13
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
28
EN
CELLS
ICOMP
VCOMP
1
2
3
4
27
26
25
24
23
22
FN9117 Rev.2.00
August 2004
Page 2 of 22
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
JA
(°C/W)
JC
(°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.
JA
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.
JA
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
JC
, 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, C
VDD
= 1µF I
VDD
= 0mA,
T
A
= -10°C to +100°C, T
J
125°C, unless otherwise noted.
TEST CONDITIONS
MIN
TYP
MAX
UNITS
PARAMETER
SUPPLY AND BIAS REGULATOR
DCIN Input Voltage Range
DCIN Quiescent Current
DCIN Quiescent Current in Shutdown mode
Battery Leakage Current (Note 5)
VDD Output Voltage/Regulation
VDD Undervoltage Lockout Trip Point
7
EN = VDD, 7V
DCIN 25V
EN = 0, 7V
DCIN 25V
DCIN = 0, no load
7V
DCIN
25 V, 0
I
VDD
30mA
Rising
Hysteresis
O
I
VREF
300A
CSON = 16.8V, CELLS = VDD, VADJ = Float
CSON = 12.6V, CELLS = GND, VADJ = Float
CSON = 8.4V, CELLS = FLOAT, VADJ = Float
CSON = 17.64V, CELLS = VDD, VADJ = VREF
4.925
4.2
100
2.365
-0.5
-0.55
-0.55
-0.6
-0.6
-0.6
-0.6
-0.6
-0.6
1.6
1.3
2
5.075
4.4
250
2.390
0
0
0
0
0
0
0
0
0
25
4
3
10
5.225
4.6
400
2.415
0.5
0.55
0.55
0.6
0.6
0.6
0.6
0.6
0.6
V
mA
mA
A
V
V
mV
V
Reference Output Voltage VREF
Battery Charge Voltage Accuracy
CSON = 13.23V, CELLS = GND, VADJ = VREF
CSON = 8.82V, CELLS = FLOAT, VADJ = VREF
CSON = 15.96V, CELLS = VDD, VADJ = GND
CSON = 11.97V, CELLS = GND, VADJ = GND
CSON = 7.98V, CELLS = FLOAT, VADJ = GND
%
TRIP POINTS
ACSET Threshold
ACSET Input Bias Current Hysteresis
ACSET Input Bias Current
ACSET Input Bias Current
DCSET Threshold
ACSET > 1.26V
ACSET < 1.26V
1.235
2
2
-1
1.235
1.26
3.4
3.4
0
1.26
1.285
4.8
4.8
1
1.285
V
A
A
A
V
FN9117 Rev.2.00
August 2004
Page 3 of 22
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, C
VDD
= 1µF I
VDD
= 0mA,
T
A
= -10°C to +100°C, T
J
125°C, unless otherwise noted.
(Continued)
TEST CONDITIONS
DCSET
1.26V
DCSET < 1.26V
MIN
2
2
-1
TYP
3.4
3.4
0
MAX
4.8
4.8
1
UNITS
A
A
A
PARAMETER
DCSET Input Bias Current Hysteresis
DCSET Input Bias Current
DCSET Input Bias Current
OSCILLATOR
Frequency
PWM Ramp Voltage (peak-peak)
CSIP = 18V
CSIP = 11V
SYNCHRONOUS BUCK REGULATOR
Maximum Duty Cycle
UGATE Pull-up Resistance
UGATE Source Current
UGATE Pull-down Resistance
UGATE Sink Current
LGATE Pull-up Resistance
LGATE Source Current
LGATE Pull-down Resistance
LGATE Sink Current
CHARGING CURRENT SENSING AMPLIFIER
Input Common Mode Range
Input Offset Voltage
Input Bias Current at CSOP
Input Bias Current at CSON
CSOP to CSON Input Full Scale Sense Voltage
300kHz
240
1.4
0.8
300
1.55
0.9
360
1.7
1.0
kHz
V
V
97
99
1.8
1.0
0.9
1.8
1.8
1.0
0.9
1.8
99.6
3.0
%
A
A
A
A
BOOT-PHASE = 5V, 500mA source current
BOOT-PHASE = 5V, BOOT-UGATE = 2.5V
BOOT-PHASE = 5V, 500mA sink current
BOOT-PHASE = 5V, UGATE-PHASE = 2.5V
VDDP-PGND = 5V, 500mA source current
VDDP-PGND = 5V, VDDP-LGATE = 2.5V
VDDP-PGND = 5V, 500mA sink current
VDDP-PGND = 5V, LGATE = 2.5V
1.8
3.0
1.8
0
Guarantee by design
0 < CSOP < 18V
0 < CSON < 18V
CHLIM = 3.3V
CHLIM = VREF
CHLIM = FLOAT
CHLIM = GND
123
96
61
26
6
4.0
2.5
1.5
3.0
20
-25
-3
0
10
300
127
100
65
30
8.9
7.5
5.6
3.7
3.1
100
18
3
20
425
131
104
69
34
12.0
11.0
9.0
7.0
3.2
180
25
V
mV
A
A
mV
mV
mV
mV
mV
mV
mV
mV
V/CELL
mV/CELL
µA
CSOP to CSON Input Full Scale Sense Voltage in Trickle CHLIM = 3.3V
Charge Mode
CHLIM = VREF
CHLIM = FLOAT
CHLIM = GND
Trickle Charge Threshold Voltage
CSON Rising
Hysteresis
CHLIM Input Bias Current
ADAPTER CURRENT SENSING AMPLIFIER
Input Common Mode Range
Input Offset Voltage
Input Bias Current at CSIP
Input Bias Current at CSIN
ADAPTER CURRENT LIMIT THRESHOLD
CSIP to CSIN Input Full Scale Sense Voltage
ACLIM = VREF
ACLIM = Float
ACLIM = GND
Guarantee by design
0 < CSIP < DCIN
0 < CSIN < DCIN
CHLIM = GND or VREF
7
-2
325
1
25
2
475
10
V
mV
A
A
100
75
50
103
78
53
106
81
56
mV
mV
mV
FN9117 Rev.2.00
August 2004
Page 4 of 22
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, C
VDD
= 1µF I
VDD
= 0mA,
T
A
= -10°C to +100°C, T
J
125°C, unless otherwise noted.
(Continued)
TEST CONDITIONS
ACLIM = GND, or VREF
MIN
-25
TYP
MAX
25
UNITS
A
A/V
V
A/V
A/V
4
V
PARAMETER
ACLIM Input Bias Current
VOLTAGE REGULATION ERROR AMPLIFIER
Error Amplifier Trans-conductance from CSON to
VCOMP
VCOMP Voltage Range
CURRENT REGULATION ERROR AMPLIFIER
Charging Current Error Amplifier Trans conductance
Adapter Current Error Amplifier Trans conductance
ICOMP Voltage Range
BATTERY CELL SELECTOR
CELLS Input Low Voltage
CELLS Input Float Voltage
CELLS Input High Current
MOSFET DRIVER
BGATE Pull-up Current
BGATE Pull-down Current
CSIP-BGATE Voltage High
CSIP-BGATE Voltage Low
DCIN-CSON Threshold for CSIP-BGATE Going High
DCIN-CSON Threshold for CSIP-BGATE Going Low
DCIN-CSON Threshold Hysteresis
SGATE Pull-up Current
SGATE Pull-down Current
CSIP-SGATE Voltage High
CSIP-SGATE Voltage Low
CSIP-CSIN Threshold for CSIP-SGATE Going High
CSIP-CSIN Threshold Hysteresis
LOGIC INTERFACE
EN Low Level Input Voltage
EN High Level Input Voltage
ACPRN Sink Current
ACPRN Leakage Current
DCPRN Sink Current
DCPRN Leakage Current
ICM Output Voltage
Thermal Shutdown Temperature
Thermal Shutdown Temperature Hysteresis
NOTE:
CELLS = VDD
20
0.3
30
40
4
50
50
0.3
0.5
CELLS = Float
VREF
-0.3
VDD-
0.5
VREF
VREF
+ 0.3
V
V
V
CSIP-BGATE = 3V
CSIP-BGATE = 5V
1
3.25
8.0
1.4
5.0
10
0
2
7
12
0.1
200
500
400
2.0
350
15
0.1
15
6
mA
mA
V
V
mV
mV
mV
mA
µA
V
V
mV
mV
DCIN = 12V, CSON Rising
DCIN = 12V, CSON Falling
-200
0
250
0
300
300
1.4
150
8.5
0
CSIP-SGATE = 3V
CSIP-SGATE = 2.5V
1.0
40
5
3
1
8.5
2
0.8
2.0
ACPRN = 0.4V
ACPRN = 20V
DCPRN = 0.4V
DCPRN = 20V
Iload = 0 to 100A, CSIP-CSIN = 103mV
Rising
3
-1
3
-1
1.885
1.980
150
20
8
8
13
1
13
1
2.085
V
V
mA
A
mA
A
V
°C
°C
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.
FN9117 Rev.2.00
August 2004
Page 5 of 22
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