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DATASHEET
ISL6251, ISL6251A
Low Cost Multi-Chemistry Battery Charger Controller
The ISL6251, ISL6251A is a highly integrated battery charger
controller for Li-Ion/Li-Ion polymer batteries and NiMH
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 and 4
series Li-Ion cells with 0.5% accuracy over-temperature. It can
be also programmed between 4.2V+5%/cell and 4.2V-5%/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 a wide range of programmable charging current. The
ISL6251, ISL6251A provides outputs that are used to monitor
the current drawn from the AC adapter, and monitor for the
presence of an AC adapter. The ISL6251, ISL6251A
automatically transitions from regulating current mode to
regulating voltage mode.
Ordering Information
PART NUMBER
PART
(Notes 1, 2, 3) MARKING
TEMP
RANGE
(°C)
PACKAGE PKG.
(Pb-Free) DWG. #
ISL6251HRZ ISL 6251HRZ -10 to +100 28 Ld 5x5 QFN L28.55
ISL6251HAZ ISL 6251HAZ -10 to +100 24 Ld QSOP M24.15
ISL6251AHRZ ISL6251 AHRZ -10 to +100 28 Ld 5x5 QFN L28.55
ISL6251AHAZ ISL6251 AHAZ -10 to +100 24 Ld QSOP M24.15
NOTES:
1. Add “-T*” suffix for tape and reel. Please refer to TB347 for details on
reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-
free material sets, molding compounds/die attach materials, and
100% matte tin plate plus anneal (e3 termination finish, which is
RoHS compliant and 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-020.
3. For Moisture Sensitivity Level (MSL), please see device information
page for ISL6251, ISL6251A. For more information on MSL please
see techbrief TB363.
FN9202
Rev 3.00
March 13, 2014
Features
• ±0.5% Charge Voltage Accuracy (-10°C to +100°C)
• ±3% Accurate Input Current Limit
• ±3% Accurate Battery Charge Current Limit
• ±25% Accurate Battery Trickle Charge Current Limit
(ISL6251A)
• Programmable Charge Current Limit, Adapter Current Limit
and Charge Voltage
• Fixed 300kHz PWM Synchronous Buck Controller with Diode
Emulation at Light Load
• Output for Current Drawn from AC Adapter
• AC Adapter Present Indicator
• Fast Input Current Limit Response
• Input Voltage Range 7V to 25V
• Supports 2, 3 and 4 Cells Battery Pack
• Up to 17.64V Battery-Voltage Set Point
• Thermal Shutdown
• Support Pulse Charging
• Less than 10µA Battery Leakage Current
• Charge Any Battery Chemistry: Li-Ion, NiCd, NiMH, etc.
• Pb-Free (RoHS Compliant)
Applications
• Notebook, Desknote and Sub-notebook Computers
• Personal Digital Assistant
FN9202 Rev 3.00
March 13, 2014
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ISL6251, ISL6251A
Pin Configurations
ISL6251, ISL6251A
(28 LD QFN)
TOP VIEW
28 27 26 25 24 23 22
EN 1
21 CSOP
CELLS 2
20 CSIN
ICOMP 3
19 CSIP
VCOMP 4
18 NA
ICM 5
17 NA
VREF 6
16 PHASE
CHLIM 7
15 UGATE
8 9 10 11 12 13 14
ISL6251, ISL6251A
(24 LD QSOP)
TOP VIEW
VDD
ACSET
EN
CELLS
ICOMP
VCOMP
ICM
VREF
CHLIM
ACLIM
VADJ
GND
1
2
3
4
5
6
7
8
9
10
11
12
24 DCIN
23 ACPRN
22 CSON
21 CSOP
20 CSIN
19 CSIP
18 PHASE
17 UGATE
16 BOOT
15 VDDP
14 LGATE
13 PGND
FN9202 Rev 3.00
March 13, 2014
Page 2 of 20

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ISL6251, ISL6251A
Absolute Maximum Ratings
DCIN, CSIP, CSON to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +28V
CSIP-CSIN, CSOP-CSON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V
PHASE to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-7V to 30V
BOOT to PGND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +35V
ACLIM, ACPRN, CHLIM, VDD to GND . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
BOOT-PHASE, VDDP-PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
ICM, ICOMP, VCOMP to GND . . . . . . . . . . . . . . . . . . . . . . .-0.3V to VDD+0.3V
VREF, CELLS to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-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 5, 7) . . . . . . . . . . . . . .
39
9.5
QSOP Package (Note 6). . . . . . . . . . . . . . . .
88
N/A
Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . .-10°C to +150°C
Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . .-10°C to +100°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4. When the voltage across ACSET is below 0V, the current through ACSET should be limited to less than 1mA.
5. 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.
6. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
7. For JC, the “case temp” location is the center of the exposed metal pad on the package underside.
8. BOOT-PHASE voltage is -0.3V to -0.7V during start-up. This is due to a small current (<1mA) that flows from the battery to the PHASE pin and to an
internal current sink on the BOOT pin through an internal diode. This does not harm the part.
Electrical Specifications DCIN = CSIP = CSIN = 18V, CSOP = CSON = 12V, ACSET = 1.5V, ACLIM = VREF, 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. Boldface limits apply over
the operating temperature range, -10°C to +100°C.
PARAMETER
TEST CONDITIONS
MIN MAX
(Note 10)
TYP
(Note 10)
UNITS
SUPPLY AND BIAS REGULATOR
DCIN Input Voltage Range
7 25 V
DCIN Quiescent Current
EN = VDD or GND, 7V DCIN 25V
1.4 3 mA
Battery Leakage Current (Note 9)
DCIN = 0, no load
3 10 µA
VDD Output Voltage/Regulation
VDD Undervoltage Lockout Trip Point
7V DCIN 25V, 0 IVDD 30mA
VDD Rising
4.925
4.0
5.075
4.4
5.225
4.6
V
V
Hysteresis
200 250 400 mV
Reference Output Voltage VREF
Battery Charge Voltage Accuracy
0 IVREF 300µA
CSON = 16.8V, CELLS = VDD, VADJ = Float
2.365
-0.5
2.39
2.415
0.5
V
%
CSON = 12.6V, CELLS = GND, VADJ = Float
-0.5
0.5 %
CSON = 8.4V, CELLS = Float, VADJ = Float
-0.5
0.5 %
CSON = 17.64V, CELLS = VDD, VADJ = VREF
-0.5
0.5 %
CSON = 13.23V, CELLS = GND, VADJ = VREF
-0.5
0.5 %
CSON = 8.82V, CELLS = Float, VADJ = VREF
-0.5
0.5 %
CSON = 15.96V, CELLS = VDD, VADJ = GND
-0.5
0.5 %
CSON = 11.97V, CELLS = GND, VADJ = GND
-0.5
0.5 %
CSON = 7.98V, CELLS = Float, VADJ = GND
-0.5
0.5 %
TRIP POINTS
ACSET Threshold
1.24
1.26
1.28
V
ACSET Input Bias Current Hysteresis
2.2 3.4 4.4 µA
ACSET Input Bias Current
ACSET 1.26V
2.2 3.4 4.4 µA
FN9202 Rev 3.00
March 13, 2014
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ISL6251, ISL6251A
Electrical Specifications DCIN = CSIP = CSIN = 18V, CSOP = CSON = 12V, ACSET = 1.5V, ACLIM = VREF, 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. Boldface limits apply over
the operating temperature range, -10°C to +100°C. (Continued)
PARAMETER
TEST CONDITIONS
MIN MAX
(Note 10)
TYP
(Note 10)
UNITS
ACSET Input Bias Current
ACSET < 1.26V
-1 0 1 µA
OSCILLATOR
Frequency
245 300 355 kHz
PWM Ramp Voltage (Peak-Peak)
CSIP = 18V
1.6 V
CSIP = 11V
1V
SYNCHRONOUS BUCK REGULATOR
Maximum Duty Cycle
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
1.0 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
1.0 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
Note 11
-2.5 0
2.5 mV
Input Bias Current at CSOP
0 < CSOP < 18V
0.25
2
µA
Input Bias Current at CSON
0 < CSON < 18V
75 100 µA
CHLIM Input Voltage Range
0 3.6 V
CSOP to CSON Full-Scale Current Sense
Voltage
ISL6251: CHLIM = 3.3V
ISL6251A, CHLIM = 3.3V
157 165 173 mV
160 165 170 mV
ISL6251: CHLIM = 2.0V
95 100 105 mV
ISL6251A: CHLIM = 2.0V
97 100 103 mV
ISL6251: CHLIM = 0.2V
5.0
10
15.0
mV
ISL6251A: CHLIM = 0.2V
7.5
10
12.5
mV
CHLIM Input Bias Current
CHLIM = GND or 3.3V, DCIN = 0V
-1
1 µA
CHLIM Power-Down Mode Threshold
Voltage
CHLIM rising
80 88 95 mV
CHLIM Power-Down Mode Hysteresis
Voltage
15 25 40 mV
ADAPTER CURRENT SENSING AMPLIFIER
Input Common-Mode Range
7 25 V
Input Offset Voltage
Note 11
-2 2 mV
Input Bias Current at CSIP and CSIN
Combined
CSIP = CSIN = 25V
100 130 µA
Input Bias Current at CSIN
0 < CSIN < DCIN (Note 11)
0.10 1
µA
FN9202 Rev 3.00
March 13, 2014
Page 4 of 20

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ISL6251, ISL6251A
Electrical Specifications DCIN = CSIP = CSIN = 18V, CSOP = CSON = 12V, ACSET = 1.5V, ACLIM = VREF, 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. Boldface limits apply over
the operating temperature range, -10°C to +100°C. (Continued)
PARAMETER
TEST CONDITIONS
MIN MAX
(Note 10)
TYP
(Note 10)
UNITS
ADAPTER CURRENT LIMIT THRESHOLD
CSIP to CSIN Full-Scale Current Sense
Voltage
ACLIM = VREF
ACLIM = Float
97 100 103 mV
72 75 78 mV
ACLIM = GND
47 50 53 mV
ACLIM Input Bias Current
ACLIM = VREF
10 16 20 µA
ACLIM = GND
-20 -16 -10 µA
VOLTAGE REGULATION ERROR AMPLIFIER
Error Amplifier Transconductance from CELLS = VDD
CSON to VCOMP
30 µA/V
CURRENT REGULATION ERROR AMPLIFIER
Charging Current Error Amplifier
Transconductance
50 µA/V
Adapter Current Error Amplifier
Transconductance
50 µA/V
BATTERY CELL SELECTOR
CELLS Input Voltage for 4 Cell Select
4.3 V
CELLS Input Voltage for 3 Cell Select
2V
CELLS Input Voltage for 2 Cell Select
2.1 4.2 V
LOGIC INTERFACE
EN Input Voltage Range
0 VDD V
EN Threshold Voltage
Rising
1.030
1.06
1.100
V
Falling
0.985
1.000
1.025
V
Hysteresis
30 60 90 mV
EN Input Bias Current
EN = 2.5V
1.8 2.0 2.2 µA
ACPRN Sink Current
ACPRN = 0.4V
3 8 11 mA
ACPRN Leakage Current
ACPRN = 5V
-0.5 0.5 µA
ICM Output Accuracy
(Vicm = 19.9 x (Vcsip-Vcsin))
CSIP - CSIN = 100mV
CSIP - CSIN = 75mV
-3 0 +3 %
-4 0 +4 %
CSIP - CSIN = 50mV
-5 0 +5 %
Thermal Shutdown Temperature
150 °C
Thermal Shutdown Temperature
Hysteresis
25 °C
NOTES:
9. This is the sum of currents in these pins (CSIP, CSIN, BOOT, UGATE, PHASE, CSOP, CSON) all tied to 16.8V. No current in pins EN, ACSET, VADJ, CELLS,
ACLIM, CHLIM.
10. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
11. Limits established by characterization and are not production tested.
FN9202 Rev 3.00
March 13, 2014
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